Underground space anti-seismic performance stability detection system

Abstract

The invention relates to the field of underground space anti-seismic performance monitoring, in particular to an underground space anti-seismic performance stability detection system. Comprising a first positioning end, a second positioning end and a data center. A rolling wheel is mounted in the mounting inner cavity, and a pull rope is wound on the rolling wheel. One end of the pull rope is fixedly connected to the rolling wheel, and the other end extends out of the first positioning end. The outer end of the pull rope is fixedly connected to the second positioning end. The rolling wheel is matched with a first elastic piece, and the first elastic piece is used for driving the rolling wheel to tighten the pull rope. The rolling wheel is further matched with a rotation metering module. The number of turns of the pull rope on the rolling wheel is always smaller than one. The rotation metering module is electrically connected with the data center. The data center is used for determining the rotation condition of the rolling wheel through the rotation metering module and determining the anti-seismic performance stability of the underground space according to the rotation condition. According to the method, the actual anti-seismic performance of the underground space can be detected and evaluated in time, and the actual condition of a mechanical structure component of the underground space in the vibration process can be directly reflected.

Description

Technical Field

[0001] This invention relates to the field of seismic performance monitoring of underground spaces, and more specifically, to a seismic performance stability testing system for underground spaces. Background Technology

[0002] In the seismic performance testing of underground spaces, the stability of the actual seismic performance of the underground space is usually assessed and judged based on the changes in the mechanical properties of the mechanical structural components of the underground space. Currently, this often relies on on-site surveys, which is not only time-consuming and labor-intensive, but also inefficient and cannot provide timely feedback and tracking of the actual situation of the tunnel.

[0003] In view of the above, this application is hereby submitted. Summary of the Invention

[0004] The purpose of this invention is to provide a seismic stability testing system for underground spaces, which can promptly detect and evaluate the actual seismic performance of underground spaces and directly reflect the actual situation of the mechanical structural components of underground spaces during vibration, thus providing a more intuitive and comprehensive reflection of the seismic stability of underground spaces.

[0005] The embodiments of the present invention are implemented as follows: An underground space seismic performance stability testing system includes: a first positioning end, a second positioning end, and a data center.

[0006] The first positioning end has an inner cavity for mounting, and the first positioning end has an opening for communicating with the inner cavity and the outside.

[0007] A reel is installed inside the cavity, and a pull rope is wound up on the reel. One end of the pull rope is fixedly connected to the reel, and the other end of the pull rope extends beyond the first positioning end through an opening.

[0008] The first positioning end is used to fix a mechanical structural component installed in the underground space, and the second positioning end is used to fix another mechanical structural component installed in the underground space. The outer end of the pull rope is fixedly connected to the second positioning end.

[0009] The reel is equipped with a first elastic element, which drives the reel to tighten the pull rope. The reel is also equipped with a rotation metering module.

[0010] The number of turns of the pull rope on the reel is always less than 1 turn.

[0011] The rotation metering module is electrically connected to the data center. The data center uses the rotation metering module to determine the rotation status of the reel and, based on the rotation status, to determine the seismic stability of the underground space.

[0012] Furthermore, the rotation metering module includes an encoder.

[0013] The data center is used to determine the rotation of the reel using electrical signal data from the encoder.

[0014] Furthermore, the rotation measurement module includes a force sensor. The force sensor is coupled to the first elastic element to detect the elastic force of the first elastic element.

[0015] The data center is used to determine the rotation of the reel by using elastic force data detected by force sensors.

[0016] Furthermore, a mating seat, which is spherical, is also fixedly installed in the inner cavity.

[0017] The mating seat is located near the opening, and a groove is provided on the side of the mating seat near the opening. A clearance through hole is provided at the bottom of the groove, and the clearance through hole penetrates the mating seat.

[0018] The mating seat is equipped with a movable cover, the inner wall of which is spherical, and the movable cover can be rotatably fitted onto the mating seat.

[0019] A guide sleeve is fixedly installed on the movable cover, and the guide sleeve is arranged radially along the mating seat and passes through the movable cover. The movable cover extends beyond the first positioning end through the opening. The pull rope extends beyond the first positioning end through the clearance through hole and the guide sleeve.

[0020] A conductive strip is provided on the outer wall of the mating seat. The conductive strip is continuously spiraled along the outer wall of the mating seat, and the edges of adjacent loops of the conductive strip are abutted and insulated. The conductive strip covers the outer wall of the mating seat. One end of the conductive strip is electrically connected to one pole of the first detection circuit. A conductive contact is provided on the inner wall of the movable cover. The diameter of the conductive contact is less than or equal to the width of the conductive strip. The conductive contact is electrically connected to the other pole of the first detection circuit.

[0021] The first detection circuit is electrically connected to the data center, which is also used to determine the deflection direction of the movable cover relative to the mating seat based on the current data of the first detection circuit, thereby determining the deformation direction of the underground space.

[0022] Furthermore, a limiting ring is provided at one end of the clearance through hole near the opening. The limiting ring is coaxially arranged with the clearance through hole, and the inner diameter of the limiting ring is adapted to the outer diameter of the pull rope.

[0023] The mating seat has a receiving groove that extends continuously in a ring along the circumference of the clearance through hole, and is spaced apart from the clearance through hole. The receiving groove passes through the side of the mating seat away from the opening.

[0024] The receiving groove is fitted with a fitting sleeve, which slides and seals along the axial direction of the relief through hole.

[0025] A guide tube is provided at one end of the receiving groove near the opening. The guide tube extends to the limiting ring and passes through the side of the limiting ring away from the pull rope to the side of the limiting ring near the pull rope. The pull rope is in contact with the opening of the guide tube.

[0026] The container holds lubricant.

[0027] A first reference plate is provided on the side of the mating cylinder away from the receiving groove. The first reference plate is fixedly installed in the mounting cavity. The mating cylinder and the first reference plate are spaced apart. A second elastic element abuts between the first reference plate and the mating cylinder.

[0028] Furthermore, a verification mechanism is also provided within the installation cavity. The verification mechanism includes: a receiving box, a receiving cylinder, a drive shaft, fan blades, a float, a detection needle, and a second detection circuit.

[0029] The receiving cylinder is positioned along the height of the receiving box, and the length of the receiving cylinder is greater than the height of the receiving box.

[0030] Both ends of the receiving cylinder are closed structures. The drive shaft passes through the bottom end of the receiving cylinder and is rotatably fitted into it, with a rotational seal between the drive shaft and the receiving cylinder. The fan blades are mounted on the drive shaft and located inside the receiving cylinder.

[0031] The receiving box and the receiving cylinder are connected by a first connecting pipe, which is located on the side of the fan blade near the bottom of the receiving cylinder.

[0032] The pontoon is located inside the receiving cylinder and on the side of the fan blade away from the first connecting pipe. The side wall of the pontoon is attached to the inner wall of the receiving cylinder, and the pontoon is slidably fitted inside the receiving cylinder.

[0033] The detection needle is fixedly connected to the side of the float away from the fan blades. The detection needle extends along the axial direction of the receiving cylinder and passes through the top of the receiving cylinder. Along the axial direction of the receiving cylinder, the detection needle slides within the receiving cylinder.

[0034] The sidewall of the detection needle is provided with a first conductive layer and a second conductive layer, both of which extend along the axial direction of the detection needle and are spaced apart. The ends of the first conductive layer and the second conductive layer near the float are electrically connected.

[0035] The top of the receiving cylinder is provided with a first conductive terminal and a second conductive terminal. The first conductive terminal is electrically connected to a first conductive layer, and the second conductive terminal is electrically connected to a second conductive layer. The first conductive terminal and the second conductive terminal are respectively connected to the two poles of the second detection circuit.

[0036] The container holds a liquid medium, and under normal conditions, the liquid level is higher than the fan blades. The reel is connected to the drive shaft, and when the rope is pulled out of the reel, the fan blades push the liquid medium in the container towards the side where the float is located, thereby raising the liquid level in the container.

[0037] The second detection circuit is electrically connected to the data center. The data center is used to determine whether the liquid level in the container has risen based on the current data from the second detection circuit, thereby verifying the deformation of the underground space.

[0038] Furthermore, the fan blades are configured such that when the pull rope is pulled out of the reel at a speed greater than or equal to a speed threshold, the fan blades push the liquid medium in the container cylinder toward the side where the float is located, causing the liquid level in the container cylinder to rise.

[0039] Furthermore, the receiving cylinder is also provided with a return port, which is located on the side of the fan blade away from the first connecting pipe and extends along the axial direction of the receiving cylinder. The return port and the receiving box are connected by a second connecting pipe.

[0040] The inner wall of the receiving cylinder is fixedly connected with a first stop and a second stop. Both the first stop and the second stop are located on the side of the fan blade away from the first connecting pipe. The first stop and the second stop are spaced apart, and the second stop is located on the side of the first stop away from the fan blade.

[0041] The container also includes an adapter, the sidewall of which fits against the inner wall of the container. The adapter is slidably fitted within the container and is located between the first and second stop members. The adapter has an outlet for the liquid medium to pass through.

[0042] In its natural state, the adapter is in contact with the first stop, and the opening of the reflux port is at its maximum. When the fan blades push the liquid medium in the container towards the side where the float is located, causing the liquid level in the container to rise, the adapter moves towards the second stop, and the reflux port begins to be blocked by the adapter, gradually reducing the opening of the reflux port. When the adapter is in contact with the second stop, the opening of the reflux port reaches its minimum.

[0043] Furthermore, the drive shaft has a mating through hole, which is arranged along the axial direction of the drive shaft and passes through the drive shaft.

[0044] A pull rod is fixedly connected to the side of the adapter near the fan blade. The pull rod slides into the through hole and provides a sliding seal. The pull rod extends beyond the drive shaft. A second reference plate is also provided on the side of the pull rod away from the adapter. The second reference plate is spaced apart from the pull rod and is fixedly installed in the mounting cavity. A third elastic element in a stretched state connects the second reference plate and the pull rod.

[0045] Furthermore, a limiting groove is provided on the outer wall of the mating cylinder, and multiple limiting grooves are spaced apart along the length of the mating cylinder.

[0046] The sliding fit within the mounting cavity has a limiting tooth. When the limiting tooth is at the first sliding stop, it engages with the limiting groove to restrict the movement of the fitting cylinder into the receiving groove. When the limiting tooth is at the second sliding stop, it retracts from the limiting groove.

[0047] The pull rod engages with the limiting gear. When the adapter is in contact with the first stop, the limiting gear is at the first sliding stop. When the adapter is in contact with the second stop, the limiting gear is at the second sliding stop.

[0048] The beneficial effects of the technical solutions in the embodiments of the present invention include: The seismic performance stability detection system for underground spaces provided in this invention can determine whether the reel is releasing or rewinding the rope based on the rotation direction of the reel, and can determine the length of the released / rewinding rope based on the radius and rotation angle of the reel. In this way, it is possible to determine the relative motion between the two mechanical structural components of the underground space, which are equipped with the first positioning end and the second positioning end.

[0049] The seismic stability testing system for underground spaces can continuously monitor the actual mechanical properties of underground spaces, facilitating comprehensive monitoring of the stability of underground spaces under both seismic and undisturbed conditions. This allows for a more comprehensive and reasonable assessment of the seismic stability of underground spaces, which is of positive significance for further improving the overall safety and reliability of underground spaces.

[0050] Overall, the seismic performance stability testing system for underground spaces provided by this invention can promptly detect and evaluate the actual seismic performance of underground spaces and directly reflect the actual situation of the mechanical structural components of underground spaces during vibration. It can more intuitively and comprehensively reflect the seismic performance stability of underground spaces. Attached Figure Description

[0051] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a schematic diagram of the overall structure of the underground space seismic performance stability testing system provided in an embodiment of the present invention; Figure 2 This is a structural diagram of the mating seat; Figure 3 A schematic diagram showing the arrangement of the conductive strips for the mating seat; Figure 4A schematic diagram showing the deflection of the movable cover as it moves with the pull cord; Figure 5 A schematic diagram of the overall structure of the verification mechanism (when the adapter is attached to the first stop); Figure 6 This is a diagram illustrating the assembly of the detection probe; Figure 7 A schematic diagram of the overall structure of the verification mechanism (when the adapter is attached to the second stop).

[0053] Explanation of reference numerals in the attached figures: First positioning end 100; mounting cavity 110; opening 120; winding wheel 130; pull rope 140; mating seat 150; groove 151; clearance through hole 152; conductive strip 153; limiting ring 154; receiving groove 155; mating cylinder 156; guide tube 157; first reference plate 158; second elastic element 159; movable cover 160; guide sleeve 161; second positioning end 200; verification mechanism 300; receiving box 310; receiving cylinder 320; reflux 321; First stop 322; Second stop 323; Drive shaft 330; Fan blade 331; Float 340; Detection needle 350; First conductive layer 351; Second conductive layer 352; First conductive terminal 353; Second conductive terminal 354; First connecting pipe 360; Second connecting pipe 370; Adapter 380; Flow port 381; Pull rod 400; Second reference plate 410; Third elastic element 420; Limiting groove 500; Limiting tooth 510. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0055] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0056] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0057] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0058] Furthermore, the terms "parallel" and "perpendicular" do not imply that components must be absolutely parallel or perpendicular, but rather that they can be slightly tilted. For example, "parallel" simply means that its direction is more parallel than "perpendicular," not that the structure must be perfectly parallel, but that it can be slightly tilted.

[0059] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0060] To overcome the shortcomings of existing technologies, please refer to Figure 1 This embodiment provides an underground space seismic performance stability testing system, which includes: a first positioning end 100, a second positioning end 200 and a data center (not shown in the figure).

[0061] The first positioning end 100 has an inner cavity 110 and an opening 120 for communicating the inner cavity 110 with the outside.

[0062] A reel 130 is installed in the inner cavity 110. The reel 130 winds up a pull rope 140. One end of the pull rope 140 is fixedly connected to the reel 130, and the other end of the pull rope 140 extends beyond the first positioning end 100 through the opening 120.

[0063] The first positioning end 100 is used to fix a mechanical structural component installed in the underground space, and the second positioning end 200 is used to fix another mechanical structural component installed in the underground space. The outer end of the pull rope 140 is fixedly connected to the second positioning end 200.

[0064] The reel 130 is fitted with a first elastic element (not shown in the figure), which drives the reel 130 to tighten the pull rope 140. In this way, the pull rope 140 connecting the two mechanical structural components in the underground space is constantly taut by the reel 130.

[0065] The reel 130 is also equipped with a rotation measurement module (not shown in the figure) to measure the rotation of the reel 130 (e.g., the angle of rotation, the direction of rotation, etc.), so as to facilitate the determination of the amount of rope 140 being pulled in and out during the rotation of the reel 130.

[0066] Preferably, the pull rope 140 can be made of a low-elasticity material. Preferably, the reel 130 can be in the form of a single groove. The pull rope 140 always winds less than one turn on the reel 130.

[0067] The rotation metering module is electrically connected to the data center.

[0068] The data center is used to determine the rotation status of the reel 130 through the rotation measurement module, including the rotation angle and rotation direction of the reel 130. Based on the rotation direction of the reel 130, it can be determined whether the reel 130 is releasing or rewinding the pull rope 140 when rotating. Based on the radius and rotation angle of the reel 130, the length of the release / rewind of the pull rope 140 can be determined. In this way, it is possible to determine the relative motion between the two mechanical structural components of the underground space, which are equipped with the first positioning end 100 and the second positioning end 200.

[0069] For example, (1) if it is detected that the reel 130 has released a certain length of the pull rope 140, it means that the distance between the first positioning end 100 and the second positioning end 200 has increased. In this case, the points where the corresponding two mechanical structural components are used to install the first positioning end 100 and the second positioning end 200 are far apart. This indicates that there has been directional displacement between the corresponding two mechanical structural components.

[0070] (2) If it is detected that the reel 130 has wound up a certain length of the pull rope 140, it means that the distance between the first positioning end 100 and the second positioning end 200 has become smaller. In this case, the points where the corresponding mechanical structural components are used to install the first positioning end 100 and the second positioning end 200 are close to each other. This indicates that there has been directional displacement between the corresponding two mechanical structural components.

[0071] (3) If the reel 130 is detected to periodically or approximately periodically wind up and release the pull rope 140, it indicates that the distance between the first positioning end 100 and the second positioning end 200 changes periodically or approximately periodically. Therefore, there is periodic or approximately periodic relative movement between the points where the corresponding two mechanical structural components are used to install the first positioning end 100 and the second positioning end 200. This indicates that periodic or approximately periodic swaying has occurred between the corresponding two mechanical structural components.

[0072] In cases (1) and (2), the deformation and displacement of mechanical structural components in underground spaces often occur due to prolonged exposure to continuous pressure. Another aspect is related to vibrational factors experienced by the underground space; for example, vibrations caused by earthquakes or the passage of moving objects (e.g., vehicles, fluids) can also lead to deformation and displacement of mechanical structural components. This is directly related to the mechanical structural stability of the underground space and also to the settlement of the surrounding ground.

[0073] In case (3), it is usually related to earthquakes and vibrations caused by the passage of moving objects (e.g., vehicles, fluids), which directly reflects the mechanical structural stability of underground space, especially the seismic performance stability of underground space.

[0074] In conjunction with the detection of vibration factors (e.g., combining earthquake information, using vibration sensors to detect other vibration factors at the location of the underground space), if situations (1) and (2) occur without vibration factors, it indicates that the original structural stability of the underground space is problematic, and it may encounter even worse problems when facing vibration factors, requiring timely maintenance.

[0075] If situations (1), (2), and (3) occur only when there are vibration factors, it is necessary to combine the actual vibration situation and the actual displacement and shaking during the vibration process to judge the actual performance of the seismic stability of the underground space.

[0076] Through the above methods, the underground space seismic performance stability testing system can continuously monitor the actual mechanical properties of underground spaces, facilitating comprehensive monitoring of their stability under both seismic and undisturbed conditions. It is suitable for experimental seismic performance analysis of scaled-down and proportional models of underground spaces, as well as for in-situ seismic performance analysis of existing underground spaces. This allows for a more comprehensive and reasonable assessment of the seismic performance stability of underground spaces, which is of positive significance for further improving the overall safety and reliability of underground spaces.

[0077] Overall, the underground space seismic performance stability testing system provided in this embodiment can promptly detect and evaluate the actual seismic performance of underground spaces and directly reflect the actual situation of the mechanical structural components of underground spaces during vibration. It can more intuitively and comprehensively reflect the seismic performance stability of underground spaces.

[0078] Optionally, the rotation measurement module can be an encoder and its supporting components. In this case, the data center is used to determine the rotation of the reel 130 through the electrical signal data from the encoder.

[0079] Alternatively, the rotation measurement module can also employ a force sensor and its associated components. The force sensor works in conjunction with the first elastic element to detect the elastic force of the first elastic element. In this case, the data center uses the elastic force data detected by the force sensor to determine the rotation of the reel 130.

[0080] Specifically, when the first elastic element drives the reel 130 to tighten the pull rope 140, it is in an elastic compression state. When the force sensor detects an increase in elastic force, it indicates that the first elastic element is further elastically compressed, and the reel 130 is in a state of releasing the pull rope 140. When the force sensor detects a decrease in elastic force, it indicates that the first elastic element is elastically extended, and the reel 130 is in a state of winding up the pull rope 140.

[0081] If the first elastic element drives the reel 130 to tighten the pull rope 140, it is in an elastically stretched state. When the force sensor detects an increase in elastic force, it indicates that the first elastic element is further elastically stretched, and the reel 130 is in the state of releasing the pull rope 140. When the force sensor detects a decrease in elastic force, it indicates that the first elastic element elastically contracts, and the reel 130 is in the state of winding up the pull rope 140.

[0082] Based on this, the rotation angle of the roller 130 can be determined according to the change of elastic force and elastic coefficient of the first elastic element.

[0083] It is understandable that the implementation of the rotation metering module is not limited to this.

[0084] Furthermore, please combine Figures 1-3 A mating seat 150 is also fixedly installed in the inner cavity 110. The mating seat 150 is spherical.

[0085] The mating seat 150 is positioned near the opening 120. A groove 151 is formed on the side of the mating seat 150 near the opening 120. A clearance through hole 152 is formed at the bottom of the groove 151, and the clearance through hole 152 penetrates the mating seat 150. The clearance through hole 152, the mating seat 150, and the opening 120 are coaxially arranged.

[0086] The mating seat 150 is fitted with a movable cover 160. The inner wall of the movable cover 160 is spherical. The movable cover 160 is rotatably fitted on the side of the mating seat 150 near the opening 120. The inner wall of the movable cover 160 is in contact with the outer wall of the mating seat 150.

[0087] A guide sleeve 161 is fixedly mounted on the movable cover 160. The guide sleeve 161 is arranged radially along the mating seat 150 and passes through the movable cover 160. The movable cover 160 extends beyond the first positioning end 100 through the opening 120, and the guide sleeve 161 is located outside the first positioning end 100. The pull rope 140 extends beyond the first positioning end 100 through the clearance through hole 152 and the guide sleeve 161.

[0088] A conductive strip 153 is provided on the outer wall of the mating seat 150. The conductive strip 153 is continuously arranged in a spiral shape along the outer wall of the mating seat 150. The edges of adjacent loops of the conductive strip 153 are attached together and insulated. The conductive strip 153 covers the outer wall of the mating seat 150. One end of the conductive strip 153 (hereinafter referred to as: the access end) is electrically connected to one pole of the first detection circuit.

[0089] The inner wall of the movable cover 160 is provided with conductive contacts (not shown in the figure), the diameter of which is less than or equal to the width of the conductive strip 153. In this embodiment, the diameter of the conductive contact is slightly smaller than the width of the conductive strip 153. The conductive contact can only contact one spiral of the conductive strip 153 at a time. The conductive contact is electrically connected to the other pole of the first detection circuit.

[0090] The conductive strip 153 is made of a conductive material with uniform resistance.

[0091] When relative movement occurs between the two mechanical structural components with the first positioning end 100 and the second positioning end 200 installed, since the pull rope 140 is taut, the second positioning end 200 exerts a pulling force on the pull rope 140. The outer end of the pull rope 140 will face the direction of the second positioning end 200. In this way, the guide sleeve 161 will deflect accordingly with the change in the orientation of the pull rope 140. This achieves the entire movable cover 160 rotating with the change in the orientation of the pull rope 140 to adapt to the orientation of the pull rope 140. Figure 4 As shown. In other words, the orientation change of the movable cover 160 relative to the mating seat 150 can reflect the orientation change of the outer end of the pull rope 140.

[0092] Based on this, since the conductive strip 153 is a continuous, closely spaced spiral, once the position of the movable cover 160 relative to the mating seat 150 is fixed, the position of the conductive contact on the conductive strip 153 will not change. At this time, the portion of the conductive strip 153 between the conductive contact and the access end is actually connected to the first detection circuit. Based on the change in current in the first detection circuit, the actual access length of the conductive strip 153 to the first detection circuit can be deduced. Starting from the access end of the conductive strip 153, the distance corresponding to the "access length" is calculated along the extension direction of the conductive strip 153, thus revealing the position of the conductive contact. Since the conductive contact is fixed relative to the movable cover 160, the actual angle of the movable cover 160 relative to the mating seat 150 can be determined. In this way, the data center can determine the specific orientation and angle of the movable cover 160 solely based on the change in current in the first detection circuit.

[0093] Based on this, the first detection circuit is electrically connected to the data center. The data center can determine the deflection direction of the movable cover 160 relative to the mating seat 150 based on the current data of the first detection circuit, thereby determining the orientation of the outer end of the pull rope 140 relative to the first positioning end 100. This can reflect the relative motion direction when the two mechanical structural components move relative to each other, thereby determining the direction of displacement, deformation, and swaying of the underground space. This is helpful for relevant technical personnel to make a more comprehensive and reasonable judgment on the overall mechanical stability and seismic performance stability of the underground space.

[0094] Specifically, a limiting ring 154 is provided at one end of the clearance through hole 152 near the opening 120. The limiting ring 154 is coaxially arranged with the clearance through hole 152, and the inner diameter of the limiting ring 154 is adapted to the outer diameter of the pull rope 140.

[0095] The mating seat 150 has a receiving groove 155. In this embodiment, the receiving groove 155 extends continuously in an annular shape along the circumference of the relief through hole 152, and is spaced apart from the relief through hole 152. The receiving groove 155 is an annular groove in general, and is coaxially arranged with the relief through hole 152. The receiving groove 155 extends axially along the relief through hole 152 and penetrates the side of the mating seat 150 away from the opening 120, and is spaced apart from the groove 151.

[0096] The receiving groove 155 is fitted with a fitting sleeve 156. Along the axial direction of the relief through hole 152, the fitting sleeve 156 is slidably fitted into the receiving groove 155 and slides to seal.

[0097] A guide tube 157 is provided at one end of the receiving groove 155 near the opening 120. The guide tube 157 extends to the limiting ring 154 and passes through the side of the limiting ring 154 away from the pull rope 140 to the side of the limiting ring 154 near the pull rope 140. The pull rope 140 is in contact with the opening of the guide tube 157.

[0098] The container 155 contains lubricant.

[0099] A first reference plate 158 is provided on the side of the mating cylinder 156 away from the receiving groove 155, and the first reference plate 158 is fixedly installed in the mounting cavity 110. In this embodiment, the first reference plate 158 is arranged perpendicular to the axis of the clearance through hole 152, and the first reference plate 158 has a notch for the pull rope 140 to pass through. The mating cylinder 156 and the first reference plate 158 are spaced apart, and a second elastic member 159 abuts between the first reference plate 158 and the mating cylinder 156.

[0100] With this design, the second elastic element 159 keeps the mating cylinder 156 constantly pushing away the lubricant, so that when the pull rope 140 moves against the limiting ring 154, the lubricant in the receiving groove 155 can be continuously coated onto the surface of the pull rope 140 through the guide tube 157, thereby reducing the wear of the pull rope 140 and the limiting ring 154.

[0101] When the pull rope 140 does not move relative to the limiting ring 154, the pull rope 140 is in contact with the opening of the guide tube 157, which can effectively reduce or prevent lubricant leakage and reduce lubricant loss.

[0102] Furthermore, please combine Figure 1 , Figure 2 , Figure 5 and Figure 6 The inner cavity 110 is also equipped with a verification mechanism 300. The verification mechanism 300 includes: a receiving box 310, a receiving cylinder 320, a drive shaft 330, a fan blade 331, a float 340, a detection needle 350, and a second detection circuit (not shown in the figure).

[0103] The receiving cylinder 320 is arranged along the height direction of the receiving box 310, and the length of the receiving cylinder 320 is greater than the height of the receiving box 310.

[0104] Both ends of the receiving cylinder 320 are closed structures. The drive shaft 330 passes through the bottom end of the receiving cylinder 320 and is rotatably fitted into the receiving cylinder 320, with a rotatable seal between the drive shaft 330 and the receiving cylinder 320. The fan blade 331 is mounted on the drive shaft 330 and located inside the receiving cylinder 320.

[0105] The container 310 and the container cylinder 320 are connected by a first connecting pipe 360. The first connecting pipe 360 ​​is located on the side of the fan blade 331 near the bottom end of the container cylinder 320. The first connecting pipe 360 ​​is located at the bottom of the container 310 and also at the bottom end of the container cylinder 320.

[0106] The float 340 is located inside the receiving cylinder 320 and on the side of the fan blade 331 away from the first connecting pipe 360. The side wall of the float 340 is in contact with the inner wall of the receiving cylinder 320, and the float 340 is slidably fitted inside the receiving cylinder 320.

[0107] The detection needle 350 is fixedly connected to the side of the float 340 away from the fan blade 331. The detection needle 350 extends axially along the receiving cylinder 320 and passes through the top end of the receiving cylinder 320. Along the axial direction of the receiving cylinder 320, the detection needle 350 is slidably fitted into the receiving cylinder 320. Along the circumferential direction of the receiving cylinder 320, the detection needle 350 is fixedly fitted into the receiving cylinder 320.

[0108] The sidewall of the detection needle 350 is provided with a first conductive layer 351 and a second conductive layer 352, both of which extend along the axial direction of the detection needle 350 and are spaced apart. The ends of the first conductive layer 351 and the second conductive layer 352 near the float 340 are electrically connected.

[0109] The top of the receiving cylinder 320 is provided with a first conductive terminal 353 and a second conductive terminal 354. The first conductive terminal 353 is attached to and electrically connected to the first conductive layer 351, and the second conductive terminal 354 is attached to and electrically connected to the second conductive layer 352. When the detection needle 350 slides relative to the receiving cylinder 320 along the axial direction of the receiving cylinder 320, the first conductive terminal 353 can slide along the first conductive layer 351 and remain electrically connected to the first conductive layer 351, and the second conductive terminal 354 can also slide along the second conductive layer 352 and remain electrically connected to the second conductive layer 352.

[0110] The first conductive terminal 353 and the second conductive terminal 354 are respectively connected to the two poles of the second detection circuit.

[0111] The container 310 contains a liquid medium. There is a gap between the liquid level of the liquid medium in the container 310 and the top wall of the container 310.

[0112] Both the receiving cylinder 320 and the receiving box 310 are arranged along the height direction of the first positioning end 100. When installing the first positioning end 100, it is preferable to install the height direction of the first positioning end 100 along the vertical direction.

[0113] In its natural state, the liquid level of the medium is higher than that of the fan blade 331. Since the receiving cylinder 320, the first connecting pipe 360, and the receiving box 310 form a communicating vessel structure, the liquid level of the medium in the receiving cylinder 320 is also higher than that of the fan blade 331. The float 340 floats on the surface of the liquid medium in the receiving cylinder 320.

[0114] The reel 130 is driven by the drive shaft 330. When the reel 130 rotates, the drive shaft 330 also rotates synchronously. The fan blade 331 is configured such that when the pull rope 140 is pulled out from the reel 130, the fan blade 331 drives the liquid medium in the container 320 from bottom to top, that is, from the bottom end of the container 320 towards the top end of the container 320.

[0115] With this design, when the pull rope 140 is pulled out of the reel 130, that is, when the first positioning end 100 and the second positioning end 200 move away from each other, the fan blade 331 can push the liquid medium in the container 320 towards the side where the float 340 is located, that is, drive the liquid medium in the container 320 from bottom to top, thereby raising the liquid level of the liquid medium in the container 320. At this time, the float 340 will rise accordingly, and the detection needle 350 will also rise synchronously. During this process, the first conductive terminal 353 will slide along the first conductive layer 351 for a certain distance, and the second conductive terminal 354 will also slide along the second conductive layer 352 and maintain electrical connection with the second conductive layer 352 for a certain distance, causing a change in the connection length of the first conductive layer 351 and the second conductive layer 352 to the second detection circuit, thereby causing a change in the current of the second detection circuit. In other words, it can be determined whether the pull rope 140 has been pulled out of the reel 130 by monitoring whether the current in the second detection circuit changes. This realizes the verification of the data signal of the rotation metering module.

[0116] When the current of the second detection circuit exhibits periodic or near-periodic changes in magnitude, and the rotation metering module also displays the periodic or near-periodic winding and unwinding of the pull rope 140, it indicates that a periodic or near-periodic relative sway has occurred between the two mechanical structural components corresponding to the first positioning end 100 and the second positioning end 200.

[0117] If only one of the rotation metering module and the verification mechanism 300 has a relevant signal, an inspection is required to troubleshoot the problem.

[0118] In addition, the reel 130 will not rotate when the pull rope 140 is not released and rewound. If the first positioning end 100 tilts at this time (including but not limited to deformation or displacement of the mechanical structural component where the first positioning end 100 is located), the liquid level in the container 320 will change, thereby changing the position of the float 340 and causing a change in the current data of the second detection circuit. If the rotation metering module shows that the reel 130 has not rotated, but the current of the second detection circuit has changed, it indicates that the rotation metering module may be malfunctioning or the first positioning end 100 may be tilted. In this case, the problem needs to be investigated. Thus, the verification mechanism 300 can also provide early warnings for problems such as rotation metering module malfunction and tilting of the first positioning end 100.

[0119] Based on this, the second detection circuit is electrically connected to the data center, allowing the data center to assess the actual condition of the underground space based on the current data from the second detection circuit.

[0120] In practical use, due to the reflux effect of the liquid medium in the container 320 and the reflux function of the first connecting pipe 360, when the rotational speed of the fan blade 331 is relatively low, although it can push the liquid medium in the container 320 upward, if the pushing amount is less than or equal to the natural downward reflux flow of the liquid medium, it cannot actually raise the liquid level in the container 320. Therefore, the minimum rotational speed required for the fan blade 331 to raise the liquid level can be changed by adjusting the conveying efficiency of the fan blade 331 and the inner diameter of the first connecting pipe 360.

[0121] In this embodiment, the fan blade 331 is configured such that when the speed at which the pull rope 140 is pulled out of the reel 130 is greater than or equal to a speed threshold, the fan blade 331 pushes the liquid medium in the container 320 toward the side where the float 340 is located, causing the liquid level in the container 320 to rise.

[0122] The speed threshold can be flexibly set according to actual needs. After determining the required speed threshold, the purpose of "the liquid level can only be raised when the rotational speed of the fan blade 331 reaches the speed threshold" can be achieved by adjusting the conveying efficiency of the fan blade 331 and the inner diameter of the first connecting pipe 360.

[0123] This design allows for auxiliary verification of both directional offset and swaying conditions using the verification mechanism 300.

[0124] When directional offset occurs, meaning one mechanical structural component shifts relative to another in a single direction, this offset process is typically lengthy, with the offset per unit time being very small. The offset only becomes apparent over time. For this type of offset, it is sufficient to determine the change in the release length of the pull rope 140 using the rotation metering module; verification by the verification mechanism 300 is unnecessary. The speed threshold can be set to be greater than the maximum speed at which the reel 130 can drive the fan blade 331 to rotate during this slow offset process.

[0125] For faster deviations, the rotation metering module can display the rapid release or rewind of the pull rope 140. For the verification mechanism 300, if the pull rope 140 releases quickly, the liquid level in the corresponding container 320 rises; if the pull rope 140 rewinds quickly, the fan blade 331 rotates in the opposite direction, and the liquid level in the corresponding container 320 falls. In other words, by combining the current change of the second detection circuit of the verification module, the signal data of the rotation metering module can be verified.

[0126] In the event of shaking, the rotation metering module can display the periodic and rapid release and rewind of the pull rope 140. For the verification mechanism 300, the fan blade 331 rotates forward and backward periodically. In other words, the current of the second detection circuit also changes periodically, thus verifying the signal data of the rotation metering module.

[0127] In this embodiment, the receiving cylinder 320 is also provided with a return port 321, which is located on the side of the fan blade 331 away from the first connecting pipe 360, and extends along the axial direction of the receiving cylinder 320. The return port 321 is connected to the receiving box 310 by a second connecting pipe 370.

[0128] The inner wall of the receiving cylinder 320 is fixedly connected with a first stop 322 and a second stop 323. Both the first stop 322 and the second stop 323 are located on the side of the fan blade 331 away from the first connecting pipe 360. The first stop 322 and the second stop 323 are spaced apart, and the second stop 323 is located on the side of the first stop 322 away from the fan blade 331.

[0129] The receiving cylinder 320 is also provided with an adapter 380. The side wall of the adapter 380 is fitted against the inner wall of the receiving cylinder 320. The adapter 380 is slidably fitted inside the receiving cylinder 320 and is located between the first stop 322 and the second stop 323. The adapter 380 has a flow port 381 for the liquid medium to pass through.

[0130] In its natural state, the adapter 380 is in contact with the first stop 322, and the opening of the return port 321 is at its maximum. When the fan blade 331 pushes the liquid medium in the container 320 towards the side where the float 340 is located, causing the liquid level in the container 320 to rise, the adapter 380 moves towards the second stop 323, and the return port 321 begins to be blocked by the adapter 380, gradually reducing the opening of the return port 321. When the adapter 380 is in contact with the second stop 323, the opening of the return port 321 reaches its minimum.

[0131] With this design, when the liquid level in the container 320 is raised by the fan blade 331, the adapter 380 moves towards the second stop 323 until it comes into contact with the second stop 323, and the opening of the return port 321 gradually decreases until it reaches its minimum. Figure 7 As shown. In this way, the flow rate of the liquid medium in the container 320 returning to the container 310 through the return port 321 can be reduced, thereby facilitating the smooth rise of the liquid level in the container 320, so as to successfully verify the continuous and rapid release of the pull rope 140.

[0132] Since a certain amount of liquid medium still flows smoothly back from the return port 321 to the container 310, this reduces the speed at which the liquid level rises in the container 320 and allows the liquid medium to replenish the container 310, enabling the verification mechanism 300 to complete the verification of the release of the pull rope 140 for a longer duration. This is particularly suitable for sliding situations with long shaking cycles and large shaking amplitudes, or for situations where the offset distance is large and the offset speed is not particularly fast during directional rapid offset.

[0133] Furthermore, after the rapid release of the pull rope 140, the adapter 380 falls back and re-fits with the first stop 322, and the opening of the return port 321 reaches its maximum. This allows the liquid levels in the container box 310 and the container cylinder 320 to reach equilibrium more quickly, so as to verify the continuous rapid winding of the pull rope 140 and the next continuous rapid release of the pull rope 140.

[0134] It should be noted that the lowest position of the float 340 is higher than the return port 321, that is, the lowest liquid level in the container 320 is higher than the upper edge of the return port 321.

[0135] Furthermore, the drive shaft 330 is provided with a mating through hole, which is arranged along the axial direction of the drive shaft 330 and passes through the drive shaft 330.

[0136] A pull rod 400 is fixedly connected to the side of the adapter 380 near the fan blade 331. The pull rod 400 slides in the mating through hole and provides a sliding seal. The pull rod 400 extends beyond the drive shaft 330. A second reference plate 410 is also provided on the side of the pull rod 400 away from the adapter 380. The second reference plate 410 is spaced apart from the pull rod 400 and is fixedly installed in the mounting cavity 110. A third elastic element 420 in a stretched state is connected between the second reference plate 410 and the pull rod 400. The third elastic element 420 can facilitate the adapter 380 to return to the first stop 322 more quickly.

[0137] Correspondingly, a limiting groove 500 is provided on the outer side wall of the mating cylinder 156, and multiple limiting grooves 500 are spaced apart along the length direction of the mating cylinder 156.

[0138] A limiting tooth 510 is slidably fitted in the inner cavity 110, and the limiting tooth 510 is arranged radially along the mating cylinder 156. When the limiting tooth 510 is at the first sliding stop point, the limiting tooth 510 engages with the limiting groove 500 to restrict the movement of the mating cylinder 156 into the receiving groove 155. When the limiting tooth 510 is at the second sliding stop point, the limiting tooth 510 retracts from the limiting groove 500.

[0139] The pull rod 400 is engaged with the limiting tooth 510. The engagement methods include, but are not limited to, gear engagement and lever engagement.

[0140] When the adapter 380 is engaged with the first stop 322, the pull rod 400 drives the limiting tooth 510 to move to the first sliding stop. When the adapter 380 is engaged with the second stop 323, the pull rod 400 drives the limiting tooth 510 to move to the second sliding stop.

[0141] This design ensures that lubricant is smoothly coated on the surface of the pull rope 140 each time the reel 130 rapidly releases the rope 140, reducing the risk of accidental breakage of the rope 140 during rapid release and retraction. It also prevents lubricant loss during slow release and retraction, ensuring that the lubricant is specifically applied to the rapid release and retraction process, improving the targeted use of the lubricant and reducing unnecessary lubricant consumption.

[0142] It should be noted that the movable cover 160 and the opening 120 can be fitted with a movable seal, and the first positioning end 100 can be filled with inert gas to protect the various components. In addition, the top of both the receiving box 310 and the receiving cylinder 320 are provided with air pressure balance holes that communicate with the mounting cavity 110.

[0143] In summary, the underground space seismic performance stability detection system provided by the embodiments of the present invention can timely detect and evaluate the actual seismic performance of underground spaces and directly reflect the actual situation of the mechanical structural components of underground spaces during vibration. It can more intuitively and comprehensively reflect the seismic performance stability of underground spaces.

[0144] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A seismic performance stability testing system for underground spaces, characterized in that, include: First positioning terminal, second positioning terminal, and data center; The first positioning end has an inner cavity for mounting, and the first positioning end has an opening for communicating the inner cavity with the outside. A reel is installed in the mounting cavity, and a pull rope is wound up on the reel. One end of the pull rope is fixedly connected to the reel, and the other end of the pull rope extends beyond the first positioning end through the opening. The first positioning end is used to fix a mechanical structural component installed in the underground space, and the second positioning end is used to fix another mechanical structural component installed in the underground space; the outer end of the pull rope is fixedly connected to the second positioning end; The reel is equipped with a first elastic element, which drives the reel to tighten the rope; the reel is also equipped with a rotation metering module. The number of turns of the pull rope on the reel is always less than 1 turn; The rotation measurement module is electrically connected to the data center; the data center is used to determine the rotation status of the roller through the rotation measurement module, and to determine the seismic performance stability of the underground space based on the rotation status.

2. The underground space seismic performance stability testing system according to claim 1, characterized in that, The rotation metering module includes: an encoder; The data center is used to determine the rotation of the reel using the electrical signal data from the encoder.

3. The seismic performance stability testing system for underground spaces according to claim 1, characterized in that, The rotation measurement module includes a force sensor; the force sensor is coupled to the first elastic element to detect the elastic force of the first elastic element. The data center is used to determine the rotation of the reel using the elastic force data detected by the force sensor.

4. The seismic performance stability testing system for underground spaces according to claim 1, characterized in that, A mating seat, which is spherical in shape, is also fixedly installed in the mounting cavity. The mating seat is located near the opening, and a groove is formed on the side of the mating seat near the opening. A clearance through hole is formed at the bottom of the groove, and the clearance through hole penetrates the mating seat. The mating seat is fitted with a movable cover, the inner sidewall of which is spherical, and the movable cover is rotatably fitted onto the mating seat. The movable cover is fixedly provided with a guide sleeve, which is arranged radially along the mating seat and passes through the movable cover; the movable cover extends beyond the first positioning end through the opening portion. The pull rope extends beyond the first positioning end through the clearance hole and the guide sleeve; The outer wall of the mating seat is provided with a conductive strip, which is continuously spiraled along the outer wall of the mating seat. The edges of adjacent loops of the conductive strip are attached together and insulated. The conductive strip covers the outer wall of the mating seat. One end of the conductive strip is electrically connected to one pole of the first detection circuit. The inner wall of the movable cover is provided with a conductive contact, the diameter of which is less than or equal to the width of the conductive strip. The conductive contact is electrically connected to the other pole of the first detection circuit. The first detection circuit is electrically connected to the data center, and the data center is also used to determine the deflection direction of the movable cover relative to the mating seat based on the current data of the first detection circuit, thereby determining the deformation direction of the underground space.

5. The seismic performance stability testing system for underground spaces according to claim 4, characterized in that, A limiting ring is provided at one end of the clearance through hole near the opening. The limiting ring is coaxially arranged with the clearance through hole, and the inner diameter of the limiting ring is adapted to the outer diameter of the pull rope. The mating seat has a receiving groove that extends continuously in a ring shape along the circumference of the relief through hole. The receiving groove surrounds the relief through hole and is spaced apart from the relief through hole. The receiving groove passes through the side of the mating seat away from the opening. The receiving groove is fitted with a fitting sleeve, which slides in the receiving groove and provides a sliding seal along the axial direction of the relief through hole; A guide tube is provided at one end of the receiving groove near the opening. The guide tube extends to the limiting ring and passes through the limiting ring from the side away from the pull rope to the side of the limiting ring near the pull rope. The pull rope is in contact with the opening of the guide tube. The receiving tank contains lubricant; A first reference plate is provided on the side of the mating cylinder away from the receiving groove. The first reference plate is fixedly installed in the mounting cavity. The mating cylinder and the first reference plate are spaced apart. A second elastic member abuts between the first reference plate and the mating cylinder.

6. The seismic performance stability testing system for underground spaces according to claim 5, characterized in that, The installation cavity is also equipped with a verification mechanism; the verification mechanism includes: a receiving box, a receiving cylinder, a drive shaft, a fan blade, a float, a detection needle, and a second detection circuit; The receiving cylinder is arranged along the height direction of the receiving box, and the length of the receiving cylinder is greater than the height of the receiving box; Both ends of the receiving cylinder are closed structures; the drive shaft passes through the bottom end of the receiving cylinder and is rotatably fitted to the receiving cylinder, and there is a rotatable seal between the drive shaft and the receiving cylinder; the fan blade is installed on the drive shaft and located inside the receiving cylinder; The receiving box and the receiving cylinder are connected by a first connecting pipe, which is located on the side of the fan blade near the bottom end of the receiving cylinder; The float is disposed inside the receiving cylinder and located on the side of the fan blade away from the first connecting pipe. The side wall of the float is attached to the inner wall of the receiving cylinder, and the float is slidably fitted inside the receiving cylinder. The detection needle is fixedly connected to the side of the float away from the fan blade, the detection needle extends along the axial direction of the receiving cylinder, and the detection needle passes through the top end of the receiving cylinder; along the axial direction of the receiving cylinder, the detection needle is slidably fitted into the receiving cylinder; The sidewall of the detection needle is provided with a first conductive layer and a second conductive layer, both of which extend along the axial direction of the detection needle and are spaced apart; the ends of the first conductive layer and the second conductive layer near the float are electrically connected. The top of the receiving cylinder is provided with a first conductive terminal and a second conductive terminal. The first conductive terminal is electrically connected to the first conductive layer, and the second conductive terminal is electrically connected to the second conductive layer. The first conductive terminal and the second conductive terminal are respectively connected to the two poles of the second detection circuit. The container contains a liquid medium, and under normal conditions, the liquid level of the liquid medium is higher than the fan blades. The reel is driven by the drive shaft. When the pull rope is pulled out from the reel, the fan blades push the liquid medium in the container towards the side where the float is located, thereby raising the liquid level in the container. The second detection circuit is electrically connected to the data center; the data center is used to determine whether the liquid level in the container has risen based on the current data of the second detection circuit, thereby verifying the deformation of the underground space.

7. The seismic performance stability testing system for underground spaces according to claim 6, characterized in that, The fan blades are configured such that when the speed at which the pull rope is pulled out of the reel is greater than or equal to a speed threshold, the fan blades push the liquid medium in the container towards the side where the float is located, causing the liquid level in the container to rise.

8. The seismic performance stability testing system for underground spaces according to claim 6, characterized in that, The receiving cylinder is also provided with a return port, which is located on the side of the fan blade away from the first connecting pipe and extends along the axial direction of the receiving cylinder; the return port is connected to the receiving box by a second connecting pipe; The inner wall of the receiving cylinder is fixedly connected with a first stop and a second stop. The first stop and the second stop are both located on the side of the fan blade away from the first connecting pipe. The first stop and the second stop are spaced apart, and the second stop is located on the side of the first stop away from the fan blade. The container is also provided with an adapter, the side wall of which is fitted to the inner wall of the container, the adapter is slidably fitted inside the container, and the adapter is located between the first stop and the second stop; the adapter has an outlet for the liquid medium to pass through. In its natural state, the adapter is in contact with the first stop, and the opening of the reflux port is at its maximum. When the fan blade pushes the liquid medium in the container towards the side where the float is located, causing the liquid level in the container to rise, the adapter moves toward the second stop, and the reflux port begins to be blocked by the adapter, and the opening of the reflux port gradually decreases. When the adapter is in contact with the second stop, the opening of the reflux port reaches its minimum.

9. The seismic performance stability testing system for underground spaces according to claim 8, characterized in that, The drive shaft has a mating through hole, which is arranged along the axial direction of the drive shaft and passes through the drive shaft; A pull rod is fixedly connected to the side of the adapter near the fan blade. The pull rod is slidably fitted in the mating through hole and slidably sealed. The pull rod extends beyond the drive shaft. A second reference plate is also provided on the side of the pull rod away from the adapter. The second reference plate is spaced apart from the pull rod. The second reference plate is fixedly installed in the mounting cavity. A third elastic element in a stretched state is connected between the second reference plate and the pull rod.

10. The seismic performance stability testing system for underground spaces according to claim 9, characterized in that, The outer wall of the mating cylinder is provided with a limiting groove, and multiple limiting grooves are arranged at intervals along the length direction of the mating cylinder; The mounting cavity has a sliding fit with a limiting tooth; when the limiting tooth is at the first sliding stop point, the limiting tooth engages with the limiting groove to restrict the movement of the fitting cylinder into the receiving groove; when the limiting tooth is at the second sliding stop point, the limiting tooth retracts from the limiting groove. The pull rod engages with the limiting tooth in a transmission manner; when the adapter is in contact with the first stop, the limiting tooth is located at the first sliding stop; when the adapter is in contact with the second stop, the limiting tooth is located at the second sliding stop.

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