Tunnel blast hole detection device

Abstract

The utility model discloses a tunnel blast hole detection device which comprises a handle, a detection rod capable of extending into a blast hole is arranged at the front end of the handle, the length of the detection rod is fixed, and a laser range finder used for detecting the distance between the handle and a blast hole opening is arranged in the handle. The front end of the handle is provided with a laser through hole which is parallel to the detection rod and allows laser in the laser range finder to pass through. During detection, the detection rod extends into the blast hole along the inner wall of the blast hole, the bottom of the detection rod abuts against the bottom of the blast hole, the distance between the detection rod and the opening of the blast hole is detected through the laser range finder, the difference between the length of the detection rod and data detected by the laser range finder and the depth of the blast hole are detected, the overall structure is simple, and detection of the depth of the blast hole can be achieved without installing a device. And meanwhile, the requirement that the hole diameters of the blast holes are coaxial is not needed, so that the application range of the hole diameters of the blast holes is wider.

Description

Technical Field

[0001] This utility model belongs to the field of mining blasting detection technology, specifically relating to a tunnel blast hole detection device. Background Technology

[0002] In mining and tunneling, the drill-and-blast method is a widely used construction technique. The parameters of the blast holes (such as depth, angle, and location) directly affect the blasting effect and rock mass stability. Traditional blast hole detection methods mainly rely on manual measurement, which suffers from low efficiency, poor accuracy, and inconvenient data recording. In recent years, some automated measuring equipment has been developed, but it still has shortcomings such as limited functionality, low level of intelligence, and limited data application. Existing blast hole detection technologies can be mainly divided into the following categories:

[0003] Physical contact measurement, such as measuring ropes and weights, relies on manual operation and has the disadvantages of low accuracy and poor efficiency.

[0004] Acoustic ranging technology: It measures depth by acoustic echo, but it is greatly affected by the borehole environment (such as water level and fracture zone), and the accuracy rate is between 80-95%.

[0005] Laser ranging technology requires a separate structure to ensure that the laser beam is parallel to the axis of the borehole, making it cumbersome to operate. For example, a handheld blast depth measuring device shown in Chinese patent CN108871227A requires the device to be fixed to the borehole during testing and to be retrieved after testing. Furthermore, the device is limited by the size of the spring, thus limiting its applicable borehole diameter. Utility Model Content

[0006] This utility model proposes a tunnel borehole detection device with a simple overall structure that can detect borehole depth without the need for device fixation.

[0007] Therefore, the technical solution adopted by this utility model is as follows: a tunnel borehole detection device, including a handle, a detection rod that can extend into the borehole is provided at the front end of the handle, and the length of the detection rod is fixed, a laser rangefinder for detecting the distance between the handle and the borehole opening is provided inside the handle, and a laser through hole parallel to the detection rod and allowing the laser in the laser rangefinder to pass through is provided at the front end of the handle.

[0008] As a preferred embodiment of the above solution, the handle includes a handle body and a handle back cover arranged at the front and rear.

[0009] Further preferably, the detection rod includes at least one set of telescopic units, each telescopic unit including a fixed rod and a telescopic rod that can move axially within the fixed rod. The rear end of the telescopic rod is provided with a piston that is in close contact with the inner side of the fixed rod. The front end of the fixed rod is provided with a limiting structure to prevent the piston from moving out of the fixed rod. The rearmost fixed rod is provided at the front end of the handle through a mounting structure.

[0010] In a further preferred embodiment, the limiting structure includes a limiting ring, and an inner groove is provided near the front end of the fixing rod. The limiting ring is embedded in the inner groove, and the inner diameter of the limiting ring is smaller than the inner diameter of the fixing rod.

[0011] Further preferably, the mounting structure includes a nest embedded in the handle, and the rear end of the last fixed rod is provided with two threaded segments with opposite thread directions. The nest is provided with an internal mounting thread that is threaded to the threaded segment of the fixed rod near the rear end. A lock ring for limiting the rotation of the fixed rod after installation is screwed onto the threaded segment of the last fixed rod away from the rear end.

[0012] Preferably, an indicator mark for indicating the extension length is provided near the rear end of the telescopic rod.

[0013] In a further preferred embodiment, the handle is provided with a mounting bracket, the laser rangefinder is mounted on the mounting bracket, the mounting bracket is also provided with a control board electrically connected to the laser rangefinder, the handle is also provided with a battery for power supply and electrically connected to the control board, the handle is provided with a charging port for charging the battery, and the handle is also provided with a start switch for starting the laser rangefinder.

[0014] Further preferably, the laser through hole is equipped with a protective plug, and the protective plug is fixed to the handle by a connection.

[0015] The beneficial effects of this utility model are as follows: During testing, the testing rod is inserted along the inner wall of the borehole, with the bottom of the testing rod resting against the bottom of the borehole. The distance between the testing rod and the borehole opening is then measured using a laser rangefinder. The difference between the length of the testing rod and the data detected by the laser rangefinder is then used to measure the depth of the borehole. The overall structure is simple, and the depth of the borehole can be measured without the need for an installation device. Furthermore, since it does not need to be coaxial with the borehole diameter, this application is applicable to a wider range of borehole diameters. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention.

[0017] Reference numerals: Handle-10, Handle body-11, Handle back cover-12, Mounting bracket-13, Charging port-14, Start switch-15, Detection rod-20, Fixing rod-21, Telescopic rod-22, Piston-23, Nesting-24, Rotation stop ring-25, Laser rangefinder-30, Control board-40, Battery-50. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0019] like Figure 1 As shown, a tunnel borehole detection device mainly consists of a handle 10, a detection rod 20, and a laser rangefinder 30. The detection rod 20 is located at the front end of the handle 10 and has a fixed length. A laser rangefinder 30 for detecting the distance between the handle and the borehole is installed inside the handle 10. At the same time, a laser through hole parallel to the detection rod is provided at the front end of the handle 10 to allow the laser in the laser rangefinder to pass through.

[0020] During testing, the testing rod is inserted into the borehole along the side wall. The distance between the testing rod and the borehole opening is measured using a laser rangefinder. The depth of the borehole can then be obtained by calculating the length of the testing rod and the distance measured by the laser rangefinder.

[0021] To facilitate the installation of the laser rangefinder, the handle 10 includes a handle body 11 and a handle back cover 12 arranged at the front and rear.

[0022] To accommodate boreholes of varying depths and facilitate the transport of the entire device, the detection rod 20 includes at least one telescopic unit, meaning it has a telescopic function. The telescopic unit comprises a fixed rod 21 and a telescopic rod 22 that can move axially within the fixed rod 21. A piston 23, in close contact with the inner side of the fixed rod 21, is located at the rear end of the telescopic rod 22. A limiting structure prevents the piston 23 from moving out of the fixed rod 21 at the front end of the fixed rod 21. The final fixed rod 21 is mounted at the front end of the handle 10 via a mounting structure. The piston, in close contact with the inner side of the fixed rod 21, effectively ensures that the telescopic rod will not extend or retract under relatively small forces; extension and retraction are only possible under larger external forces.

[0023] The limiting structure includes a limiting ring. A groove is provided near the front end of the fixing rod 21. The limiting ring is embedded in the groove, and the inner diameter of the limiting ring is smaller than the inner diameter of the fixing rod 21.

[0024] The mounting structure includes a nest 24 embedded in the handle 10. The rear end of the last fixed rod 21 is provided with two threaded sections with opposite directions. The nest 24 is provided with an internal mounting thread that is threaded to the threaded section of the fixed rod 21 near the rear end. A lock ring 25 for limiting the rotation of the fixed rod after installation is screwed onto the threaded section of the last fixed rod 21 away from the rear end. Preferably, the rear end of the lock ring is tightened onto the handle, and the major diameter of the thread on the lock ring that is tightened with the handle is larger than the inner diameter of the thread that is tightened with the fixed rod.

[0025] For ease of use, a mounting bracket 13 is provided inside the handle 10, and the laser rangefinder 30 is mounted on the mounting bracket 13. A control board 40 electrically connected to the laser rangefinder 30 is also provided on the mounting bracket 13. A battery 50 for power supply and electrically connected to the control board is also provided inside the handle 10. A charging port 14 for charging the battery is provided on the handle 10, and a power switch 15 for starting the laser rangefinder 30 is also provided on the handle 10. The control board is a microcontroller with information processing, information receiving, and information transmission capabilities, as is common in the prior art.

[0026] To ensure a fixed length of the detection rod during use, an indicator mark is installed near the rear end of each telescopic rod 22 to indicate the extension length. A trigger sensor is also installed at the indicator mark. When the telescopic rod just protrudes from the indicator mark under external force, it indicates that the rod does not need to extend further. The trigger sensor determines how many telescopic rods have extended, thus determining the overall length of the detection rod. Ideally, a trigger sensor should also be installed at the front end of the telescopic rod to ensure that the telescopic rod only has two states during detection: fully extended and not extended.

Claims

1. A tunnel borehole detection apparatus, characterized by: The handle (10) is provided with a detection rod (20) capable of extending into a blast hole at the front end, and the length of the detection rod (20) is fixed, a laser range finder (30) for detecting the distance between the handle and the blast hole is arranged in the handle (10), and the handle (10) is provided with a laser through hole parallel to the detection rod and allowing laser in the laser range finder to pass through.

2. The tunnel bore detection apparatus of claim 1, wherein: The handle (10) comprises a handle main body (11) and a handle rear cover (12) arranged in front and back.

3. The tunnel bore detection apparatus of claim 1, wherein: The detection rod (20) comprises at least one set of telescopic units, each telescopic unit comprises a fixed rod (21) and a telescopic rod (22) capable of moving axially in the fixed rod (21), the rear end of the telescopic rod (22) is provided with a piston (23) in close contact with the inner side of the fixed rod (21), the front end of the fixed rod (21) is provided with a limiting structure for preventing the piston (23) from moving out of the fixed rod (21), and the last end of the fixed rod (21) is arranged at the front end of the handle (10) through a mounting structure.

4. The tunnel bore detection apparatus of claim 3, wherein: The limiting structure comprises a limiting ring, the fixed rod (21) is provided with an inner groove at a position close to the front end, and the limiting ring is embedded in the inner groove, and the inner diameter of the limiting ring is smaller than the inner diameter of the fixed rod (21).

5. The tunnel bore detection apparatus of claim 3, wherein: The mounting structure comprises a nest (24) embedded in the handle (10), the rear end of the last end of the fixed rod (21) is provided with two threaded sections with opposite screw directions, the nest (24) is provided with an installation inner thread for threadedly connecting with the threaded section close to the rear end of the fixed rod (21), and the threaded section away from the rear end of the last end of the fixed rod (21) is screwed with a rotation stop ring (25) for limiting the rotation of the fixed rod after installation.

6. The tunnel bore detection apparatus of claim 3, wherein: The telescopic rod (22) is provided with an indication mark at a position close to the rear end for indicating the extension length.

7. The tunnel bore detection apparatus of claim 1, wherein: The handle (10) is provided with a mounting bracket (13), the laser range finder (30) is mounted on the mounting bracket (13), the mounting bracket (13) is further provided with a control panel (40) electrically connected with the laser range finder (30), the handle (10) is further provided with a battery (50) for power supply and electrically connected with the control panel, the handle (10) is provided with a charging port (14) for charging the battery, and the handle (10) is further provided with a start switch (15) for starting the laser range finder (30).

8. The tunnel bore detection apparatus of claim 1, wherein: The laser through hole is provided with a protective plug, and the protective plug is fixed on the handle (10) through connection.

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