Highway tunnel crack detection device

Abstract

The invention belongs to the technical field of tunnel detection, and discloses a highway tunnel crack detection device which comprises a base and is characterized in that an electric push rod is fixedly mounted at the top end of the base, a mounting plate is arranged at the top end of the electric push rod, and a crack detector is arranged at the top end of the mounting plate; the cleaning mechanism is arranged at the top end of the mounting plate; in the rotating process of fan blades, air outside equipment can be sucked into a fixed shell, then the air entering the fixed shell can be exhausted from the interior of an exhaust pipe, then the exhausted air can blow away dust remaining on the surface of the crack detector, and finally a cleaning brush is moved through a first driving motor; according to the method, the crack detector can be cleaned, flowing air is used for blowing away dust remaining on the surface of the crack detector, the collection quality of crack images is improved, the crack features are more obvious, and the identification and detection difficulty is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of tunnel detection, and specifically relates to a crack detection device for highway tunnels. Background Art

[0002] A crack detection device for highway tunnels is a device specifically designed to detect and evaluate the crack conditions of the internal structures of highway tunnels;

[0003] Currently, traditional crack detection devices for highway tunnels push the device into the tunnel and then move the device. During the movement of the device, the electric push rod is driven to move the crack detector upward, and then the crack detector is driven to collect data inside the tunnel. When cracks appear in the tunnel structure, the crack detector can sense changes in the width, length, depth, etc. of the cracks in real time, and transmit these parameters to a remote server or data center in real time through a data transmission system;

[0004] However, in the actual use process, the environment inside the tunnel is often very complex, with many factors that are not conducive to crack detection; among them, dust is the most prominent problem; a large amount of dust may accumulate inside the tunnel due to vehicle passage, construction residues, or natural settlement. During the detection process, this dust is easily attached to the surface of the lens or sensor of the crack detector. The attachment of dust will significantly reduce the quality of crack image acquisition, making the originally clearly visible crack features become blurred, increasing the difficulty of identification and detection. Summary of the Invention

[0005] To solve the problem that dust will adhere to the surface of the detector and reduce the quality of crack image acquisition in the above-mentioned background art, the present invention provides a crack detection device for highway tunnels.

[0006] To achieve the above object, the present invention provides the following technical solution: A crack detection device for highway tunnels, including a base, characterized in that: an electric push rod is fixedly installed at the top of the base, an installation plate is arranged at the top of the electric push rod, and a crack detector is arranged at the top of the installation plate;

[0007] A cleaning mechanism is arranged at the top of the installation plate. The cleaning mechanism includes a fixed collar, the fixed collar is fixedly connected to the top of the installation plate and is designed around the crack detector. A toothed plate is rotatably connected inside the fixed collar. Four sliding holes are opened on the surface of the toothed plate. Four sliders slide inside the four sliding holes. The top of each of the four sliders is fixedly installed with a cleaning brush located at the top of the crack detector. A motor one is fixedly installed at the top of the fixed collar. The output end of the motor one extends into the fixed collar and is fixedly installed with a gear one that meshes with the toothed plate;

[0008] The air blowing mechanism is arranged at the bottom end of the fixed collar.

[0009] Preferably, it further includes: a swing mechanism, which is arranged inside the base. The swing mechanism includes a second gear, the second gear is rotatably connected inside the base, the top end of the second gear is fixedly installed with a swing rod located outside the base, the bottom end of the swing rod is fixedly installed with a cleaning plate, a toothed ring is slidably connected inside the base, one side of the outer surface of the toothed ring is fixedly installed with a rack meshing with the second gear, a second motor is fixedly installed inside the base, and the output end of the second motor is fixedly installed with a third gear located inside the toothed ring, and the third gear meshes with the second motor.

[0010] Preferably, the air blowing mechanism includes a fixed shell, the fixed shell is fixedly connected to the bottom end of the fixed collar, the bottom end of the first gear is fixedly installed with a fan blade located inside the fixed shell, and an exhaust pipe is fixedly installed on the outer surface of the fixed shell, and one end of the exhaust pipe is located at the top of the cleaning brush.

[0011] Preferably, a fixing hole is opened at the top end of the fixed collar, and the slider can slide inside the fixing hole. A limiting ring is fixedly sleeved on the surface of the fixing hole, and the surface of the limiting ring is in contact with the surface of the fixed collar. The size of the limiting ring is larger than that of the fixing hole.

[0012] Preferably, a sliding rod is fixedly installed inside the base, and a limiting block is slidably sleeved on the surface of the sliding rod, and one side of the limiting block is fixedly connected to one side of the toothed ring.

[0013] Preferably, the top end of the electric push rod is fixedly installed with a mounting seat, a rotating block is rotatably connected inside the mounting seat, and the top end of the rotating block is fixedly connected to the bottom end of the mounting plate. A third motor is fixedly installed on one side of the mounting seat, and the output end of the third motor is fixedly connected to the rotating block.

[0014] Preferably, rollers are arranged on both sides of the surface of the base, and a handle is fixedly installed at the top end of the base.

[0015] Preferably, the third gear is designed as a half gear, and the teeth inside the toothed ring are symmetrically designed.

[0016] Preferably, the sliding hole is curved, and the surface of the slider fully fits with the inner wall of the sliding hole.

[0017] Preferably, a square hole is opened on one side of the base, and the swing rod can slide inside the square hole.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The present invention drives the motor 1 to make the gear 1 rotate in the opposite direction, and the gear 1 drives the tooth plate to rotate in the opposite direction, and then the slider drives the cleaning brush to move toward the surface of the crack detector, and then the bristles at the bottom of the cleaning brush contact the surface of the crack detector, so as to clean the crack detector, and in the process of the rotation of the gear 1, the fan blades rotate accordingly, and in the process of the rotation of the fan blades, the air outside the device is sucked into the interior of the fixed shell, and then the air entering the interior of the fixed shell is discharged from the interior of the exhaust pipe, and then the discharged air blows away the dust remaining on the surface of the crack detector, and finally the cleaning brush is moved by driving the motor 1, so as to clean the crack detector, and the dust remaining on the surface of the crack detector is blown away by the flowing air, so as to improve the acquisition quality of the crack image, make the crack characteristics more obvious, and reduce the difficulty of identification and detection;

[0020] The present invention drives motor two to rotate gear three. Since gear three is a half gear design, gear three can drive the gear ring and the rack to move back and forth, and the moving rack will drive gear two to rotate, and gear two will drive the swing rod and the cleaning plate to swing back and forth, and thus in the process of swinging, the stones on the path can be effectively pushed away, and finally the cleaning plate can be swung by driving motor two, which can effectively push away the stones on the path and prevent them from accumulating under the chassis, thereby preventing the stones from being stuck at the bottom of the base and affecting the normal movement of the equipment, thereby improving the continuity of data collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of a cross-section fixing collar of the present invention;

[0023] Figure 3 It is a schematic diagram of a cross-sectional fixed shell of the present invention;

[0024] Figure 4 It is a schematic diagram showing the blowing mechanism of the present invention;

[0025] Figure 5 It is a schematic diagram of the squint device of the present invention;

[0026] Figure 6 It is a schematic diagram of a cross-sectional base of the present invention;

[0027] Figure 7 This is a schematic diagram of a cross-sectional gear ring of the present invention;

[0028] Figure 8 For the present invention Figure 3 A is an enlarged schematic diagram.

[0029] In the figure: 1, base; 2, electric push rod; 3, mounting plate; 4, crack detector; 5, fixed collar; 6, toothed plate; 7, sliding hole; 8, slider; 9, cleaning brush; 10, motor 1; 11, gear 1; 12, gear 2; 13, swing rod; 14, cleaning plate; 15, toothed ring; 16, rack; 17, motor 2; 18, gear 3; 19, fixed housing; 20, fan blade; 21, exhaust pipe; 22, fixing hole; 23, limiting ring; 24, slide bar; 25, limiting block; 26, mounting seat; 27, rotating block; 28, motor 3; 29, roller; 30, handle. Detailed implementation mode

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0031] As Figures 1 to 8 shown, the present invention provides a crack detection device for highway tunnels, including a base 1, an electric push rod 2 is fixedly installed at the top of the base 1, a mounting plate 3 is arranged at the top of the electric push rod 2, and a crack detector 4 is arranged at the top of the mounting plate 3;

[0032] A cleaning mechanism is arranged at the top of the mounting plate 3. The cleaning mechanism includes a fixed collar 5. The fixed collar 5 is fixedly connected to the top of the mounting plate 3 and is designed around the crack detector 4. A toothed plate 6 is rotatably connected inside the fixed collar 5. Four sliding holes 7 are formed on the surface of the toothed plate 6. Four sliders 8 are slidably arranged inside the four sliding holes 7. The top ends of the four sliders 8 are fixedly installed with cleaning brushes 9 located at the top of the crack detector 4. A motor 10 is fixedly installed at the top of the fixed collar 5. The output end of the motor 10 extends into the fixed collar 5 and is fixedly installed with a gear 11 meshing with the toothed plate 6;

[0033] A blowing mechanism is arranged at the bottom of the fixed collar 5.

[0034] Using the above solution: The operator pushes the device into the tunnel. Then, the first motor 10 can be driven to rotate the first gear 11. Since the first gear 11 meshes with the toothed plate 6, the rotating first gear 11 will drive the toothed plate 6 to rotate. During the rotation of the toothed plate 6, the slider 8 will slide inside the sliding hole 7, and then the slider 8 will drive the cleaning brush 9 away from the surface of the crack detector 4. At this time, the crack detector 4 will be exposed. Then, the electric push rod 2 can be driven to move the mounting plate 3 and the crack detector 4 upward. Thus, the crack detector 4 can collect data inside the tunnel. When cracks appear in the tunnel structure, the crack detector 4 can sense changes in the width, length, depth, etc. of the cracks in real time and convert these changes into electrical signals. The data acquisition and processing system receives these electrical signals, processes and analyzes them, and generates relevant parameters of the cracks; these parameters are transmitted to a remote server or data center in real time through the data transmission system;

[0035] During the detection process, when dust appears on the surface of the crack detector 4, the first motor 10 can be driven again to rotate the first gear 11 in the reverse direction. The first gear 11 will drive the toothed plate 6 to rotate in the reverse direction. Then, the slider 8 will drive the cleaning brush 9 to move towards the surface of the crack detector 4. Then, the bristles at the bottom of the cleaning brush 9 will contact the surface of the crack detector 4, thereby cleaning the crack detector 4. During the cleaning process, the air blowing mechanism will blow the cleaned dust to prevent the dust from remaining on the surface of the crack detector 4. Finally, by driving the first motor 10 to move the cleaning brush 9, the crack detector 4 can be cleaned, thereby improving the quality of the crack image acquisition, making the crack features more obvious, and increasing the difficulty of identification and detection.

[0036] As Figure 1 、 Figure 6 and Figure 7 shown, it further includes a swinging mechanism, which is arranged inside the base 1. The swinging mechanism includes a second gear 12, the second gear 12 is rotatably connected inside the base 1, the top end of the second gear 12 is fixedly installed with a swinging rod 13 located outside the base 1, the bottom end of the swinging rod 13 is fixedly installed with a cleaning plate 14, a toothed ring 15 is slidably connected inside the base 1, one side of the outer surface of the toothed ring 15 is fixedly installed with a rack 16 meshing with the second gear 12, a second motor 17 is fixedly installed inside the base 1, and the output end of the second motor 17 is fixedly installed with a third gear 18 located inside the toothed ring 15, and the third gear 18 meshes with the second motor 17.

[0037] Adopting the above solution: Through the design of the swinging mechanism, when the device moves inside the tunnel, it can drive the second motor 17 to rotate the third gear 18. Since the third gear 18 meshes with the toothed ring 15, the rotating third gear 18 will drive the toothed ring 15 to move. During the movement of the toothed ring 15, the rack 16 will move in the direction of the movement of the toothed ring 15. Since the rack 16 meshes with the second gear 12, the moving rack 16 will drive the second gear 12 to rotate. The second gear 12 will drive the swinging rod 13 and the cleaning plate 14 to swing. Since the cleaning plate 14 is arranged on one side of the base 1, during the swinging process, it can clean the stones at one end of the device. Finally, by driving the second motor 17 to make the cleaning plate 14 swing, it can effectively push aside the stones on the path, prevent them from accumulating under the chassis, and further avoid the stones getting stuck at the bottom end of the base 1, affecting the normal movement of the device, thereby improving the continuity of data collection.

[0038] As Figure 2 , Figure 3 and Figure 4 shown, the air blowing mechanism includes a fixed shell 19. The fixed shell 19 is fixedly connected to the bottom end of the fixed collar 5. A fan blade 20 located inside the fixed shell 19 is fixedly installed at the bottom end of the first gear 11. An exhaust pipe 21 is fixedly installed on the outer surface of the fixed shell 19, and one end of the exhaust pipe 21 is located at the top of the cleaning brush 9.

[0039] Adopting the above solution: Through the design of the fixed shell 19, the fan blade 20 and the exhaust pipe 21, when the first gear 11 drives the cleaning brush 9 to clean the surface of the crack detector 4, the first gear 11 will also drive the fan blade 20 to rotate. During the rotation of the fan blade 20, the air outside the device will be sucked into the inside of the fixed shell 19, and then the air entering the inside of the fixed shell 19 will be discharged from the inside of the exhaust pipe 21. Since one end of the exhaust pipe 21 is located at the top of the cleaning brush 9, it can blow the cleaned dust away from the surface of the crack detector 4, thereby ensuring the accuracy of data monitoring.

[0040] As Figure 2 and Figure 8 shown, a fixing hole 22 is opened at the top end of the fixed collar 5, and the slider 8 can slide inside the fixing hole 22. A limiting ring 23 is fixedly sleeved on the surface of the fixing hole 22, and the surface of the limiting ring 23 is in contact with the surface of the fixed collar 5. The size of the limiting ring 23 is larger than that of the fixing hole 22.

[0041] Adopting the above solution: Through the design of the fixing hole 22 and the limiting ring 23, when the slider 8 moves, it will slide inside the fixing hole 22, and thus the fixed collar 5 will not interfere with the movement of the slider 8. When the slider 8 moves, the limiting ring 23 will move along, and the size of the limiting ring 23 is larger than that of the fixing hole 22. Therefore, when the limiting ring 23 moves, it can limit the slider 8 to prevent it from falling off the inside of the sliding hole 7 when the slider 8 slides.

[0042] As Figure 5 and Figure 7 shown, a slide bar 24 is fixedly installed inside the base 1, a limiting block 25 is slidably sleeved on the surface of the slide bar 24, and one side of the limiting block 25 is fixedly connected to one side of the toothed ring 15. The top end of the electric push rod 2 is fixedly installed with a mounting seat 26. A rotating block 27 is rotatably connected inside the mounting seat 26, and the top end of the rotating block 27 is fixedly connected to the bottom end of the mounting plate 3. One side of the mounting seat 26 is fixedly installed with a motor three 28, and the output end of the motor three 28 is fixedly connected to the rotating block 27.

[0043] Adopting the above solution: Through the design of the slide bar 24 and the limiting block 25, since one side of the limiting block 25 is fixedly connected to one side of the toothed ring 15, when the toothed ring 15 moves, it will drive the limiting block 25 to move on the surface of the slide bar 24. Thus, the slide bar 24 can limit the limiting block 25 and the toothed ring 15. Through the design of the mounting seat 26, the rotating block 27 and the motor three 28, when it is necessary to adjust the detection angle of the crack detector 4, the motor three 28 can be driven to rotate the rotating block 27. The rotating block 27 will drive the mounting plate 3 and the crack detector 4 to rotate. By rotating the crack detector 4, the angle adjustment of the crack detector 4 is completed, thereby improving the diversity of equipment detection.

[0044] As Figure 1 and Figure 7 shown, rollers 29 are arranged on both sides of the surface of the base 1, a handle 30 is fixedly installed at the top end of the base 1, the gear three 18 is designed as a semi-gear, and the teeth inside the toothed ring 15 are symmetrically designed.

[0045] Adopting the above solution: Through the design of the rollers 29 and the handle 30, the operator can hold the handle 30 to push the equipment to make the rollers 29 rotate, and the rotating rollers 29 will drive the entire equipment to move, thereby facilitating the operator to detect the entire tunnel. Through the design of the toothed ring 15 and the gear three 18, since the gear three 18 is designed as a semi-gear, when the gear three 18 rotates, its teeth will mesh with a row of teeth inside the toothed ring 15, and thus the toothed ring 15 and the rack 16 can reciprocate, and the rack 16 drives the gear two 12, the swing rod 13 and the cleaning plate 14 to swing.

[0046] As Figure 1 、 Figure 2 andFigure 3 As shown, the sliding hole 7 is designed to be curved, and the surface of the slider 8 fully fits against the inner wall of the sliding hole 7. A square hole is formed on one side of the base 1, and the swing rod 13 can slide inside the square hole.

[0047] With the above solution: Through the design of the sliding hole 7 and the slider 8, since the sliding hole 7 is designed to be curved and the surface of the slider 8 fully fits against the inner wall of the sliding hole 7, when the toothed plate 6 rotates, the slider 8 will move along the inner wall of the sliding hole 7, thus facilitating the cleaning brush 9 to clean the crack detector 4. Through the design of the base 1, since a square hole is formed on one side of the base 1, when the swing rod 13 rotates, the base 1 will not interfere with the rotation of the swing rod 13, and the surface of the swing rod 13 fits against the inner wall of the square hole, thus being able to limit the swing rod 13.

[0048] The working principle and usage process of the present invention are as follows:

[0049] First, the operator can hold the grip 30 to rotate the roller 29, thereby enabling the device to enter the interior of the tunnel. When the device is moving, the motor two 17 can be driven to rotate the gear three 18. Since the gear three 18 is designed as a semi-gear, the gear three 18 can drive the toothed ring 15 and the rack 16 to reciprocate. The moving rack 16 will drive the gear two 12 to rotate, and the gear two 12 will drive the swing rod 13 and the cleaning plate 14 to swing reciprocally. Thus, during the swinging process, the stones on the path can be effectively pushed aside;

[0050] At this time, the motor one 10 can be driven to rotate the gear one 11, and the gear one 11 will drive the toothed plate 6 and the sliding hole 7 to rotate. During the rotation of the toothed plate 6, the slider 8 will slide along the curved direction of the sliding hole 7, and the slider 8 drives the cleaning brush 9 away from the surface of the crack detector 4. At this time, the crack detector 4 will be exposed. Then, the electric push rod 2 can be driven to move the mounting plate 3 and the crack detector 4 upward, and thus the crack detector 4 can be driven to collect data inside the tunnel. When cracks appear in the tunnel structure, the crack detector 4 will transmit the parameters to the remote server or data center in real time through the data transmission system;

[0051] During the detection process, when dust appears on the surface of the crack detector 4, the first motor 10 can be driven again to make the first gear 11 rotate in the reverse direction. The first gear 11 will drive the toothed plate 6 to rotate in the reverse direction. Then, the slider 8 will drive the cleaning brush 9 to move towards the surface of the crack detector 4. Then, the bristles at the bottom of the cleaning brush 9 will contact the surface of the crack detector 4, thereby cleaning the crack detector 4. Moreover, during the rotation of the first gear 11, the fan blade 20 will rotate accordingly. During the rotation of the fan blade 20, the air outside the device will be sucked into the interior of the fixed housing 19. Then, the air entering the interior of the fixed housing 19 will be discharged from the interior of the exhaust pipe 21. Then, the discharged air will blow away the dust remaining on the surface of the crack detector 4, thereby ensuring the accuracy of data monitoring and finally completing the operation process.

[0052] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0053] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A highway tunnel crack detection device, comprising a base (1), characterized in that: An electric push rod (2) is fixedly installed at the top of the base (1), an installation plate (3) is arranged at the top of the electric push rod (2), and a crack detector (4) is arranged at the top of the installation plate (3); A cleaning mechanism is arranged at the top of the installation plate (3). The cleaning mechanism includes a fixed collar (5). The fixed collar (5) is fixedly connected to the top of the installation plate (3) and is designed around the crack detector (4). A toothed plate (6) is rotatably connected inside the fixed collar (5). Four sliding holes (7) are formed in the surface of the toothed plate (6). Four sliders (8) are slidably arranged inside the four sliding holes (7). Cleaning brushes (9) located at the top of the crack detector (4) are fixedly installed at the tops of the four sliders (8). A motor one (10) is fixedly installed at the top of the fixed collar (5). The output end of the motor one (10) extends into the fixed collar (5) and is fixedly installed with a gear one (11) meshing with the toothed plate (6); A blowing mechanism is arranged at the bottom of the fixed collar (5).

2. The highway tunnel crack detection device according to claim 1, characterized in that, It further includes: a swinging mechanism arranged inside the base (1). The swinging mechanism includes a gear two (12). The gear two (12) is rotatably connected inside the base (1). A swinging rod (13) located outside the base (1) is fixedly installed at the top of the gear two (12). A cleaning plate (14) is fixedly installed at the bottom of the swinging rod (13). A toothed ring (15) is slidably connected inside the base (1). A rack (16) meshing with the gear two (12) is fixedly installed on one side of the outer surface of the toothed ring (15). A motor two (17) is fixedly installed inside the base (1). The output end of the motor two (17) is fixedly installed with a gear three (18) located inside the toothed ring (15), and the gear three (18) meshes with the motor two (17).

3. The highway tunnel crack detection device according to claim 1, characterized in that: The blowing mechanism includes a fixed shell (19). The fixed shell (19) is fixedly connected to the bottom of the fixed collar (5). A fan blade (20) located inside the fixed shell (19) is fixedly installed at the bottom of the gear one (11). An exhaust pipe (21) is fixedly installed on the outer surface of the fixed shell (19), and one end of the exhaust pipe (21) is located at the top of the cleaning brush (9).

4. The highway tunnel crack detection device according to claim 1, characterized in that: A fixing hole (22) is formed at the top of the fixed collar (5), and the slider (8) can slide inside the fixing hole (22). A limiting ring (23) is fixedly sleeved on the surface of the fixing hole (22), and the surface of the limiting ring (23) is in contact with the surface of the fixed collar (5). The size of the limiting ring (23) is larger than that of the fixing hole (22).

5. The highway tunnel crack detection device according to claim 1, characterized in that: A sliding rod (24) is fixedly installed inside the base (1). A limiting block (25) is slidably sleeved on the surface of the sliding rod (24), and one side of the limiting block (25) is fixedly connected to one side of the toothed ring (15).

6. The highway tunnel crack detection device according to claim 1, wherein: The top end of the electric push rod (2) is fixedly installed with a mounting seat (26). A rotating block (27) is rotatably connected inside the mounting seat (26), and the top end of the rotating block (27) is fixedly connected to the bottom end of the mounting plate (3). A third motor (28) is fixedly installed on one side of the mounting seat (26), and the output end of the third motor (28) is fixedly connected to the rotating block (27).

7. The highway tunnel crack detection device according to claim 1, characterized in that: Rollers (29) are arranged on both sides of the surface of the base (1), and a handle (30) is fixedly installed at the top end of the base (1).

8. The highway tunnel crack detection device according to claim 2, characterized in that: The third gear (18) is designed as a semi-gear, and the teeth inside the toothed ring (15) are symmetrically designed.

9. The highway tunnel crack detection device according to claim 1, characterized in that: The sliding hole (7) is curved, and the surface of the slider (8) fully fits the inner wall of the sliding hole (7).

10. The highway tunnel crack detection device according to claim 1, characterized in that: A square hole is formed in one side of the base (1), and the swing rod (13) can slide inside the square hole.

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