A rock wall detection device for tunnel construction

Abstract

The present application provides a rock wall detection device for tunnel construction, which relates to the field of rock wall detection. The device comprises an upper plate and a lower plate spaced apart from each other, and a six-claw robot symmetrically arranged between the upper plate and the lower plate. The six-claw robot is an open source robot. The middle parts of the upper plate and the lower plate are both through-shaped. An equipment cabin is provided between the upper plate and the lower plate. A follower assembly is provided above the upper plate. The follower assembly comprises a follower shaft and a magnetic box arrayed outside the follower shaft. The magnetic box is arc-shaped, and a repeater is provided in the inner cavity of the magnetic box. The present application realizes the separation of the magnetic box and the rubber layer from the follower shaft by increasing the magnetic force by coordinating the AC electromagnet with the magnetic box arrayed outside the follower shaft and the rubber layer, thereby facilitating the prevention of the magnetic box and the repeater inside the magnetic box at the corner of the tunnel, thereby increasing the stability of signal transmission.

Description

Technical Field

[0001] The present invention relates to the field of rock wall detection, and in particular to a rock wall detection device for tunnel construction. Background Art

[0002] Carrying out rock wall inspection before the construction of high-speed railway tunnels is of far-reaching significance. By accurately grasping key parameters such as the geological structure of the rock wall, rock strength and deformation characteristics, it is possible to identify potential risks such as faults, cracks, weak interlayers in advance and formulate targeted safety measures to ensure construction safety. It can also provide a scientific basis for the design of support structures and the optimization of blasting parameters, avoid waste of resources and improve construction efficiency. At the same time, it can identify unfavorable geological bodies such as caves and gas and predict the deformation trend of the rock mass, prevent secondary disasters, and ultimately provide a traceable compliance basis for project quality acceptance, so as to achieve the goal of safe, economical and efficient construction. When the existing high-speed railway tunnels are rock wall inspected before construction, the space at the rock wall inspection site is small and long, and the tunnel will have certain turns. Therefore, during the inspection, the inspection equipment needs to be deep into the rock wall. At this time, there are problems such as unstable detection signal transmission and shaking of the detection sensor during detection, resulting in inaccurate detection, affecting the detection results.

[0003] For example, the Chinese utility model patent (application number: CN202221122411.4) discloses a "rock wall inspection device for tunnel construction." Its specification discloses that a tunnel is a structure built underground, underwater, or in a mountain to lay railways or build roads for motor vehicles to pass through. Tunnels can be divided into three categories based on their location: mountain tunnels, underwater tunnels, and urban tunnels. Before tunnel construction, workers need to test the hardness of the rock wall after construction to determine whether it is brittle rock that does not meet the hardness standard, such as shale. Furthermore, the narrow space at the rock wall inspection site is not conducive to manual inspection by workers, and the hardness of the rock wall needs to be tested at different heights. This patent can demonstrate the shortcomings of the existing technology.

[0004] Therefore, we have made improvements to this problem and proposed a rock wall detection device for tunnel construction. Summary of the Invention

[0005] The purpose of the present invention is to: when conducting rock wall inspection before the construction of existing high-speed railway tunnels, since the space at the rock wall inspection site is small and long, and the tunnel also has certain turns, it is necessary to insert the inspection equipment into the rock wall during inspection. At this time, there is the problem of unstable detection signal transmission and shaking of the detection sensor during inspection, which leads to inaccurate detection and affects the detection results.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides a rock wall detection device for tunnel construction to improve the above-mentioned problem.

[0007] The specific application is as follows:

[0008] It includes an upper plate and a lower plate spaced apart from each other, and a six-claw robot symmetrically arranged between the upper plate and the lower plate. The six-claw robot is an open source robot. The middle parts of the upper plate and the lower plate are both through-shaped. An equipment cabin is arranged between the upper plate and the lower plate. The interior of the equipment cabin is embedded with a Velodyne VLP-16 three-dimensional lidar, a MALÅProEx geological radar, an ultrasonic array sensor, an FBG fiber grating strain sensor, a Sensirion SHT45 temperature and humidity sensor, a Figaro TGS2611 gas detection sensor and an ADIS16470 inertial navigation. A follow-up component is arranged above the upper plate, and the follow-up component includes a follow-up shaft and a magnetic box arrayed outside the follow-up shaft. The magnetic box is arc-shaped, and a repeater is arranged in the inner cavity of the magnetic box.

[0009] As a preferred technical solution of the present application, the follower assembly also includes an array of partitions arranged on the outside of the follower shaft, the partitions are spaced apart from the magnetic box, the two sides of the magnetic box in contact with the partitions and the partitions are both made of metal ceramic material, and the friction coefficient of the metal ceramic material is 0.8.

[0010] As a preferred technical solution of the present application, a rubber layer is fixedly installed on the outer surface of the magnetic box, and the rubber layer is arc-shaped, and the outer surface of the rubber layer is granular.

[0011] As a preferred technical solution of the present application, side plates are fixedly installed at both ends of the follower shaft, and the outer sides of the two groups of side plates are sleeved with connecting shafts extending outward.

[0012] As a preferred technical solution of the present application, electric push rods are arranged at intervals at both ends of the follower shaft, the side wall of the telescopic end of the electric push rod is connected to one end of the connecting shaft, and the fixed end of the electric push rod passes through the upper plate and extends to the top of the lower plate.

[0013] As a preferred technical solution of this application, an AC electromagnet is provided in the middle of the lower plate, an inner groove is opened on the inner side of the lower plate, and spring clips are installed on the outer array of the AC electromagnet. The spring clips pass through the inner groove and are connected to the inner side of the lower plate.

[0014] As a preferred technical solution of this application, a permanent magnet is provided in the middle of the upper plate, an inner groove is opened on the inner side of the upper plate, and an outer array of the permanent magnet is provided with spring pieces, which pass through the inner groove and are fixedly connected to the inner side of the upper plate.

[0015] As a preferred technical solution of the present application, a mounting plate is fixedly installed on the outside of the equipment cabin, and spring telescopic rods are arranged in an array at both upper and lower ends of the mounting plate, and both ends of the spring telescopic rods are spherical.

[0016] As the preferred technical solution of the present application, the two ends of the spring telescopic rod located above are spherically socketed with the lower surface of the permanent magnet and the upper surface of the mounting plate respectively, and the two ends of the spring telescopic rod located below are spherically socketed with the lower surface of the mounting plate and the upper surface of the AC electromagnet respectively.

[0017] As a preferred technical solution of the present application, the bottom array of the lower plate is provided with bottom rods, and the gap between the bottom rods is the same as the width of the middle part of the magnetic box.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In the scheme of this application:

[0020] 1. To address the problem of unstable detection signal transmission caused by the need to insert the detection equipment deep into the rock wall during detection due to the narrow and long space at the rock wall detection site and the certain turning points of the tunnel in the prior art, the present application uses an AC electromagnet to cooperate with the magnetic box and rubber layer arranged in an array outside the follower shaft to increase the magnetic force to separate the magnetic box and rubber layer from the follower shaft, thereby facilitating the placement of the magnetic box at the corner of the tunnel to realize the deployment of the repeater inside the magnetic box, thereby increasing the stability of signal transmission;

[0021] 2. In order to solve the problem in the prior art that the detection sensor shakes during detection, resulting in inaccurate detection, the present application sets a mounting plate on the outside of the equipment cabin, and uses spring telescopic rods arrayed at the upper and lower ends of the mounting plate to facilitate buffering when the six-claw robot encounters vibrations during movement, thereby ensuring that the equipment cabin and the sensors embedded in its inner cavity are relatively stable, and by setting permanent magnets and AC electromagnets above and below the equipment cabin respectively, the equipment cabin is placed in a suspended state through magnetic levitation, thereby increasing the stability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the rock wall detection device for tunnel construction provided in this application;

[0023] Figure 2 A bottom view of the structure of the rock wall detection device for tunnel construction provided in this application;

[0024] Figure 3 A cross-sectional view of the structure of the rock wall detection device for tunnel construction provided in this application;

[0025] Figure 4 An exploded diagram of the connection structure of the follower assembly of the rock wall detection device for tunnel construction provided in this application;

[0026] Figure 5 A cross-sectional view of the connection structure of the upper plate of the rock wall detection device for tunnel construction provided in this application;

[0027] Figure 6 Schematic diagram of the connection structure of the mounting plate of the rock wall detection device for tunnel construction provided in this application;

[0028] Figure 7 Schematic diagram of the magnetic direction of the AC electromagnet, permanent magnet and magnetic box of the rock wall detection device for tunnel construction provided in this application.

[0029] Indicated in the figure:

[0030] 1. Six-claw robot; 2. Lower plate; 3. Upper plate; 4. AC electromagnet; 5. Shrapnel; 6. Permanent magnet;

[0031] 7. Follower assembly; 701. Follower shaft; 702. Side plate; 703. Connecting shaft; 704. Partition plate; 705. Magnetic box; 706. Rubber layer;

[0032] 8. Electric push rod; 9. Inner groove; 10. Mounting plate; 11. Equipment compartment; 12. Spring telescopic rod; 13. Bottom rod. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0034] As described in the background technology, when rock wall inspection is carried out before the construction of existing high-speed railway tunnels, the space at the rock wall inspection site is small and long, and the tunnel also has certain turns. Therefore, during the inspection, the inspection equipment needs to be inserted deep into the rock wall. At this time, the detection signal transmission is unstable during the inspection, and the detection sensor shakes during the inspection, resulting in inaccurate detection and affecting the detection results.

[0035] In order to solve this technical problem, the present invention provides a rock wall detection device for tunnel construction, which is applied to signal-enhanced integrated rock wall detection.

[0036] Specifically, please refer to Figure 1-Figure 7The rock wall detection device for tunnel construction specifically includes an upper plate 3 and a lower plate 2 spaced apart from each other, and a six-claw robot 1 symmetrically arranged between the upper plate 3 and the lower plate 2. The six-claw robot 1 is an open source robot. The middle parts of the upper plate 3 and the lower plate 2 are both through-connected. An equipment cabin 11 is provided between the upper plate 3 and the lower plate 2. The interior of the equipment cabin 11 is embedded with a Velodyne VLP-16 three-dimensional lidar, a MALÅ ProEx geological radar, an ultrasonic array sensor, an FBG fiber Bragg grating strain sensor, a Sensirion SHT45 temperature and humidity sensor, a Figaro TGS2611 gas detection sensor, and an ADIS16470 inertial navigation. A follower assembly 7 is provided above the upper plate 3. The follower assembly 7 includes a follower shaft 701 and a magnetic box 705 arrayed on the outside of the follower shaft 701. The magnetic box 705 is arc-shaped, and a repeater is provided in the inner cavity of the magnetic box 705.

[0037] As attached Figure 7 As shown, the hexapod magnetic boxes 705 arranged in an array correspond to each other in pairs and are divided into three groups. Each magnetic box 705 is symmetrically distributed, and the magnetic forces at both ends attract each other. The magnetic forces on the outsides of each adjacent group of magnetic boxes 705 are opposite.

[0038] The rock wall detection device for tunnel construction provided by the present invention realizes the separation of the magnetic box and the rubber layer from the follower shaft by increasing the magnetic force through the arrangement of an AC electromagnet in conjunction with the magnetic box and the rubber layer arranged in an array outside the follower shaft, thereby facilitating the placement of the magnetic box and the repeater inside the magnetic box at the corner of the tunnel, thereby increasing the stability of signal transmission.

[0039] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0042] Example 1, please refer to Figure 3 and Figure 4 A rock wall detection device for tunnel construction, wherein the follower assembly 7 further comprises a partition 704 arrayed on the outside of the follower shaft 701, the partition 704 and the magnetic box 705 are spaced apart, the contacting sides of the magnetic box 705 and the partition 704 are made of metal ceramic material, and the friction coefficient of the metal ceramic material is 0.8;

[0043] A rubber layer 706 is fixedly mounted on the outer surface of the magnetic box 705, and the rubber layer 706 is arc-shaped, and the outer surface of the rubber layer 706 is granular;

[0044] Side plates 702 are fixedly mounted on both ends of the follower shaft 701, and the outer sides of the two sets of side plates 702 are sleeved with outwardly extending connecting shafts 703;

[0045] Electric push rods 8 are arranged at both ends of the follower shaft 701 at intervals. The side wall of the telescopic end of the electric push rod 8 is connected to one end of the connecting shaft 703, and the fixed end of the electric push rod 8 passes through the upper plate 3 and extends to the top of the lower plate 2.

[0046] By symmetrically arranging the magnetic boxes 705 in pairs and utilizing the suction force between the magnetic boxes 705 and the friction force between the two sides of the magnetic boxes 705 and the partition 704, it is convenient to adsorb the magnetic boxes 705 on the outside of the follower shaft 701. At the same time, the rubber layer 706 fixedly installed on the outside of the magnetic boxes 705 can also provide buffering and protection when the magnetic boxes 705 rotate with the follower shaft 701.

[0047] Please refer to Figure 5 A rock wall detection device for tunnel construction, wherein an AC electromagnet 4 is provided in the middle of the lower plate 2, an inner groove 9 is opened on the inner side of the lower plate 2, and a spring piece 5 is installed on the outer array of the AC electromagnet 4, which passes through the inner groove 9 and is connected to the inner side of the lower plate 2.

[0048] A permanent magnet 6 is provided in the middle of the upper plate 3 , an inner groove 9 is provided on the inner side of the upper plate 3 , and an outer array of springs 5 ​​is provided on the outer side of the permanent magnet 6 . The springs 5 ​​pass through the inner groove 9 and are fixedly connected to the inner side of the upper plate 3 .

[0049] As attached Figure 7 As shown, the magnetic direction of the permanent magnet 6 is fixed, and it generates a repulsive force with the magnetic box No. D 705 and repels the magnetic box No. A 705. However, since the magnetic box No. A 705 is in contact with the inner wall of the tunnel, and the repulsive force generated by the permanent magnet 6 is less than the weight of the magnetic box No. A 705, the magnetic box No. A can be prevented from detaching under the action of the permanent magnet.

[0050] Example 2 further optimizes the rock wall detection device for tunnel construction provided in Example 1. Specifically, Figure 6 As shown, a mounting plate 10 is fixedly installed on the outside of the equipment cabin 11, and spring telescopic rods 12 are arranged in an array at the upper and lower ends of the mounting plate 10, and both ends of the spring telescopic rods 12 are spherical.

[0051] The two ends of the spring telescopic rod 12 located above are spherically connected to the lower surface of the permanent magnet 6 and the upper surface of the mounting plate 10 respectively, and the two ends of the spring telescopic rod 12 located below are spherically connected to the lower surface of the mounting plate 10 and the upper surface of the AC electromagnet 4 respectively.

[0052] The bottom array of the lower plate 2 is provided with bottom rods 13 , and the gap between the bottom rods 13 is the same as the width of the middle part of the magnetic box 705 .

[0053] The spring telescopic rods 12 arranged in an array cooperate with the mounting plate 10 to cushion the device when it is vibrated to avoid damage to signal transmission. The bottom rods 13 arranged in the array are convenient for cushioning the lower plate 2 when moving, and can also be used to limit the magnetic box 705 when it is recovered.

[0054] The use process of the rock wall detection device for tunnel construction provided by the present invention is as follows:

[0055] First, take out the device and place it at the entrance of the tunnel. At this time, the electric push rod 8 can be selectively started to drive the follower assembly 7 to move until the rubber layer 706 on the outside of the follower assembly 7 contacts the inner wall of the tunnel. At this time, the six-claw robot can be used to drive the device to move into the interior of the tunnel. During the movement, the six-claw robot 1 can also be moved horizontally by the limit of the follower assembly 7. If the tunnel is circular, it can also facilitate the tilting or even inversion of the device. At the same time, the AC electromagnet 4 is started so that its magnetic pole direction is as shown in the attached figure. Figure 7 As shown, the AC electromagnet 4 cooperates with the permanent magnet 6 to make the equipment cabin 11 and the mounting plate 10 suspended between the upper plate 3 and the lower plate 2, thereby reducing the fluctuation of the inverted equipment cabin 11 due to shaking during movement, which affects the stability of data transmission. At this time, the repulsive force Felectric generated by the AC electromagnet 4 and the repulsive force Fpermanent generated by the permanent magnet 6 are equal to the weight G1 of the equipment cabin 11 plus the mounting plate 10, that is: Felectric+Fpermanent=G1; and in this state, refer to the attached figure. Figure 7 As shown, the arrayed magnetic boxes 705 are symmetrically distributed in pairs, and their outer magnetic poles attract each other. In addition, the metal ceramic material on both sides is in contact with the partition 704, which increases the friction force, so that the arrayed magnetic boxes 705 can surround the outer side of the follower shaft 701.

[0056] When moving, the six-jaw robot 1 continuously drives the device to move. Since the follower component 7 contacts the inner wall of the tunnel, during the movement, under the friction of the rubber layer 706, the magnetic cassette 705 and the follower shaft 701 will also rotate synchronously. As the six-jaw robot 1 continuously moves, the equipment cabin 11 set in its middle continuously collects data in the rock wall and continuously transmits it outside. When there is a collision or the internal rock of the tunnel falls off and impacts during the movement, causing the upper plate 3 and the lower plate 2 to vibrate, first, the deformation and displacement of the elastic pieces 5 arrayed on the outer sides of the AC electromagnet 4 and the permanent magnet 6 offset the lateral impact. At the same time, the spring telescopic rods 12 arrayed at the upper and lower ends of the mounting plate 10 correspondingly stretch and contract to achieve secondary buffering, avoiding the shaking of the equipment cabin 11 caused by the impact, thus affecting the stability of data transmission;

[0057] When moving to the corner, at this time, the six-jaw robot 1 drives the device to move, and the follower shaft 701 drives the magnetic cassette 705 and the rubber layer 706 to follow until before and after the corner, the magnetic cassette 705 moves to the position as shown in the appendix Figure 7 At this time, by changing the pole direction of the AC electromagnet 4 and changing its electromagnetic intensity, the magnetic force exerted by the AC electromagnet 4 on the A magnetic cassette 705 increases and is converted into a repulsive force. As the magnetic force of the AC electromagnet 4 continuously increases, the A magnetic cassette 705 will slowly separate from the follower shaft 701 under the action of the magnetic force of the AC electromagnet 4. At this time, the magnetic force F_electric + F_permanent exerted by the AC electromagnet 4 and the permanent magnet 6 on the A magnetic cassette 705 is greater than the sum of the gravity G2 of the A magnetic cassette 705 and the rubber layer 706, and the magnetic force F_electric + F_permanent generated by this AC electromagnet 4 is also required to be less than G2 plus the friction force f between the magnetic cassette 705 and the partition 704. This friction force can be expressed as f = μ·N·cosθ, where μ is the friction coefficient, that is, 0.8, N is the normal force, that is, G1·tan60 ° °, θ is 60 ° °, and the overall range of the AC electromagnet magnetic force is: G2 < F_electric + F_permanent < G2 + f, so as to ensure that under the action of the magnetic force of the AC electromagnet 4, the A magnetic cassette 705 detaches, but does not cause the B magnetic cassette 705 and the C magnetic cassette 705 to separate;

[0058] When the A magnetic cassette 705 moves upward under the action of the magnetic force of the AC electromagnet 4 and separates from it, then start the six-jaw robot 1 at this time to make the device continue to move forward. At this time, the A magnetic cassette 705 will fall at the corner of the tunnel as the magnetic force continuously weakens, so as to ensure the normal signal transmission through the repeater set in the inner cavity of the magnetic cassette 705. Repeat the above steps continuously until the detection is completed;

[0059] At this time, the six-claw robot 1 drives the device to return. During the return process, the AC electromagnet 4 always generates magnetic force. When the six-claw robot 1 moves to the top of the scattered magnetic box 705, it will adsorb the magnetic box 705 under the action of the magnetic force, and then realize recovery. The adsorbed magnetic box 705 is attached to the gap between the bottom rods 13, and this process is repeated until all the magnetic boxes 705 are recovered and return to the tunnel entrance through the six-claw robot 1.

[0060] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A rock wall detection device for tunnel construction, characterized in that: The invention comprises an upper plate (3) and a lower plate (2) spaced apart from each other, and a six-claw robot (1) symmetrically arranged between the upper plate (3) and the lower plate (2), wherein the six-claw robot (1) is an open source robot, an equipment cabin (11) is arranged between the upper plate (3) and the lower plate (2), a follower assembly (7) is arranged above the upper plate (3), the follower assembly (7) comprises a follower shaft (701) and a magnetic box (705) arrayed outside the follower shaft (701), and a repeater is arranged in the inner cavity of the magnetic box (705); A rubber layer (706) is fixedly mounted on the outer surface of the magnetic box (705), and the rubber layer (706) is arc-shaped, and the outer surface of the rubber layer (706) is granular; An AC electromagnet (4) is provided in the middle of the lower plate (2), an inner groove (9) is provided on the inner side of the lower plate (2), and spring pieces (5) are installed in an array on the outer side of the AC electromagnet (4), and the spring pieces (5) pass through the inner groove (9) and are connected to the inner side of the lower plate (2); A permanent magnet (6) is provided in the middle of the upper plate (3), an inner groove (9) is provided on the inner side of the upper plate (3), and an outer array of springs (5) is provided on the outer side of the permanent magnet (6), and the springs (5) pass through the inner groove (9) and are fixedly connected to the inner side of the upper plate (3); By cooperating with the magnetic box (705) and the rubber layer (706) arranged in an array outside the follower shaft (701) through the arrangement of the AC electromagnet (4), the magnetic box (705) and the rubber layer (706) are separated from the follower shaft (701) by increasing the magnetic force, thereby facilitating the placement of the magnetic box (705) and the repeater inside the magnetic box (705) at the corner of the tunnel, thereby increasing the stability of signal transmission.

2. A rock wall detection device for tunnel construction according to claim 1, characterized in that: The follower assembly (7) further comprises a partition (704) arranged in an array outside the follower shaft (701), the partition (704) and the magnetic box (705) are spaced apart, and both sides of the magnetic box (705) in contact with the partition (704) and the partition (704) are made of metal ceramic material.

3. The rock wall detection device for tunnel construction according to claim 1, characterized in that: Side plates (702) are fixedly mounted on both ends of the follower shaft (701), and outwardly extending connecting shafts (703) are sleeved on the outer sides of the two sets of side plates (702).

4. A rock wall detection device for tunnel construction according to claim 3, characterized in that: Electric push rods (8) are spaced apart at both ends of the follower shaft (701), the side wall of the telescopic end of the electric push rod (8) is connected to one end of the connecting shaft (703), and the fixed end of the electric push rod (8) passes through the upper plate (3) and extends to the top of the lower plate (2).

5. The rock wall detection device for tunnel construction according to claim 1, characterized in that: A mounting plate (10) is fixedly mounted on the outside of the equipment cabin (11), and spring telescopic rods (12) are arranged in an array at both upper and lower ends of the mounting plate (10), and both ends of the spring telescopic rods (12) are spherical.

6. A rock wall detection device for tunnel construction according to claim 5, characterized in that: The two ends of the spring telescopic rod (12) located above are spherically connected to the lower surface of the permanent magnet (6) and the upper surface of the mounting plate (10), respectively. The two ends of the spring telescopic rod (12) located below are spherically connected to the lower surface of the mounting plate (10) and the upper surface of the AC electromagnet (4), respectively.

7. The rock wall detection device for tunnel construction according to claim 1, characterized in that: The bottom array of the lower plate (2) is provided with bottom rods (13), and the gap between the bottom rods (13) is the same as the width of the middle portion of the magnetic box (705).

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