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CN-122016928-A - Device for testing detonation velocity in blast hole

CN122016928ACN 122016928 ACN122016928 ACN 122016928ACN-122016928-A

Abstract

The invention belongs to the technical field of explosion velocity testing, and discloses a device for testing explosion velocity in a blast hole, which comprises an explosion-proof tail shell and an anti-impact head shell coaxially and fixedly connected to the top end of the explosion-proof tail shell; the top end of the anti-impact head shell is provided with a detection component for detecting the explosion speed through a wireless signal, and the inside of the anti-explosion tail shell is provided with a self-centering component. According to the invention, the axial linear motion is converted into the radial synchronous expansion motion of the supporting plate, and the constant tension force is provided by matching with the return spring, so that the device can automatically adapt to the diameter change and the rugged of the inner wall of the blast hole, and the device main body is forcedly locked at the geometric center position of the blast hole, thereby eliminating the operation error caused by the traditional manual installation, and more importantly, ensuring that the radar beam direction in the detection assembly is always parallel to the axis of the blast hole, thereby effectively avoiding the angle error caused by the inclination of the probe, and ensuring the high precision and high consistency of the explosion velocity test data.

Inventors

  • YANG FAN
  • WEI GUO
  • WU PANYU
  • Zhou tianjiao
  • ZHANG FEI
  • NI LIN
  • FAN QINGLI

Assignees

  • 安徽江南化工股份有限公司

Dates

Publication Date
20260512
Application Date
20260106

Claims (10)

  1. 1. The device for testing the explosion velocity in the blast hole is characterized by comprising an explosion-proof tail shell (1) and an anti-impact head shell (4) which is coaxially and fixedly connected to the top end of the explosion-proof tail shell (1); The top end of the anti-impact head shell (4) is provided with a detection component (9) for detecting the explosion velocity through a wireless signal; The explosion-proof tail shell (1) is internally provided with a self-centering assembly (3), and the self-centering assembly (3) is provided with a connecting rod linkage mechanism which drives the side wall to radially expand through axial movement and is used for locking the device in the center of a blast hole; An air leakage component (8) is arranged between the explosion-proof tail shell (1) and the anti-impact head shell (4), and the air leakage component (8) is provided with an automatic opening structure which is triggered by impact wave pressure and is physically separated and is used for releasing high-pressure gas in the interior; the anti-impact head is characterized in that a guide post (5) is arranged in the anti-impact head shell (4), and a variable cross section accelerating channel for rectifying and reducing pressure of the invasion gas is arranged in the guide post (5).
  2. 2. The device for testing the detonation velocity in the blast hole according to claim 1, wherein the connecting rod linkage mechanism of the self-centering assembly (3) comprises an operating rod (301) which is sleeved in the explosion-proof tail shell (1) in a sliding way and a movable plate (302) which is fixed at the top end of the operating rod; the bottom end of the movable plate (302) is circumferentially hinged with a plurality of first fixing seats (303), each first fixing seat (303) is rotationally connected with a second fixing seat (304) through a supporting rod (305), and the outer side of each second fixing seat (304) is connected with a mounting rod (306); The side wall of the explosion-proof tail shell (1) is provided with a hole site for the installation rod (306) to pass through, and the tail end of the installation rod (306) is fixed with a supporting plate (307) positioned at the outer side of the shell; The movable plate (302) is driven to displace by pushing the operating rod (301), so that the supporting plate (307) is driven to open outwards radially.
  3. 3. The device for testing the detonation velocity in the blasthole according to claim 2, wherein the self-centering assembly (3) further comprises an elastic reset mechanism, and the elastic reset mechanism comprises a fixed sleeve (308) and a reset rod (309) penetrating inside the fixed sleeve (308); One end of the reset rod (309) is connected with the movable plate (302), the other end of the reset rod is provided with a limiting plate (3011), a reset spring (3010) which is abutted to the bottom of the limiting plate (3011) is arranged in the fixed sleeve (308), and the reset spring (3010) is used for driving the supporting plate (307) to retract when the external force of the operating rod (301) is removed.
  4. 4. The device for testing the detonation velocity in the blast hole according to claim 1, wherein the variable-section accelerating channel arranged in the guide column (5) is a Venturi accelerating channel (6), and the Venturi accelerating channel (6) sequentially comprises a funnel-shaped inlet section, a necking throat section and a conical outlet section from top to bottom; The bottom of guide post (5) is connected with circuit case (7), the internal diameter of circuit case (7) with venturi accelerating channel (6) exit segment's aperture looks adaptation, just circuit case (7) are located the top of air leakage subassembly (8).
  5. 5. The device for testing the detonation velocity in the blasthole according to claim 1, wherein the air leakage assembly (8) comprises an explosion-proof bottom plate (801) communicated with an outlet at the bottom end of the guide column (5), and the explosion-proof bottom plate (801) extends outwards and is communicated with a diffusion tube (803) in a bowl-shaped structure; The center of the explosion-proof bottom plate (801) is convexly provided with a guide cone (802), and the tip of the guide cone (802) is opposite to the gas outlet of the guide column (5) and is used for guiding and dispersing axial impact gas flow into the diffusion pipe (803).
  6. 6. The device for testing the detonation velocity in the blasthole according to claim 5, wherein the automatic opening structure of the air leakage assembly (8) comprises a baffle ring (805) covering the top end opening of the diffusion tube (803), and a plurality of locking lugs (804) arranged on the edge of the inner side wall of the diffusion tube (803); The anti-drop collar (807) is sleeved at the tail end of the anti-drop bar (806), the anti-drop collar (807) and the locking lug plate (804) form separable connection in an interference fit or clamping mode, and when the air pressure in the diffusion tube (803) exceeds a threshold value, the anti-drop collar (807) is separated from a locking state to release the baffle ring (805).
  7. 7. The device for testing the detonation velocity in the blasthole according to claim 1, wherein the detection assembly (9) comprises a fixed skirt (901) at the top and a conical diverter cone (902) inlaid at the top end of the fixed skirt (901); A focusing lens (903) is arranged in the inner cavity of the fixed skirt (901), and the focusing lens (903) is positioned below the shunt cone (902) and perpendicular to the axis of the device.
  8. 8. The device for testing the detonation velocity in the blasthole according to claim 7, wherein an external thread pipe (904) is arranged at the bottom of the fixed skirt edge (901), an internal thread pipe (905) is screwed on the external thread pipe (904), and a plurality of longitudinal mounting grooves (906) are formed in the inner wall of the internal thread pipe (905); The detection assembly (9) further comprises a millimeter wave radar (907), a protruding clamping block matched with the mounting groove (906) is arranged on the outer wall of the millimeter wave radar (907), and the millimeter wave radar (907) is axially pressed and fixed through screwing of the internal thread pipe (905).
  9. 9. The device for testing the detonation velocity in the blast hole according to claim 1, wherein a pair of handles (2) are symmetrically fixed on the outer walls of two sides of the bottom end of the explosion-proof tail shell (1) for an operator to hold and operate the self-centering assembly (3).
  10. 10. The device for testing the detonation velocity in the blast hole according to claim 1, wherein the main body materials of the explosion-proof tail shell (1) and the anti-impact head shell (4) are titanium alloy, and the outer surfaces of the explosion-proof tail shell (1) and the anti-impact head shell (4) are covered with thermal barrier coating structures.

Description

Device for testing detonation velocity in blast hole Technical Field The invention belongs to the technical field of explosion velocity testing, and particularly relates to a device for testing explosion velocity in a blast hole. Background The detonation velocity is an important parameter for measuring the performance of the explosive, and the existing testing method mainly comprises a resistance wire method and an electromagnetic wave method. Among them, in-hole testing using millimeter wave radar is favored because it can continuously record data. One of the main problems in the prior art is the difficulty of installation and centering. The inner wall of the blast hole is generally rugged, and the conventional device is difficult to maintain in the geometric center of the blast hole. If the test probe is inclined, an included angle is formed between the radar beam and the movement direction of the detonation wave, so that the measured data are obviously deviated. In addition, the traditional installation mode often needs manual wiring and filling fixation, and the operation process is tedious and time-consuming, so that the efficiency of field operation is greatly affected Another core problem is insufficient protection and pressure relief capability. At the moment of explosive detonation, extremely high impact pressure and instantaneous high temperature can be generated inside the blast hole. Most of the existing devices lack an effective physical buffering and active pressure relief mechanism, and high-pressure gas often directly impacts a circuit part, so that expensive electronic components are damaged before data transmission is completed. This not only causes a one-time destruction of the equipment (recovery of 0%), increasing the test cost, but also makes it difficult to obtain complete detonation wave growth process data. Disclosure of Invention The invention aims to provide a device for testing the detonation velocity in a blast hole so as to solve the problems in the background technology. In order to achieve the aim, the invention provides the following technical scheme that the device for testing the explosion velocity in the blast hole comprises an explosion-proof tail shell and an anti-impact head shell coaxially and fixedly connected to the top end of the explosion-proof tail shell; the top end of the anti-impact head shell is provided with a detection component for detecting the explosion velocity through a wireless signal; The explosion-proof tail shell is internally provided with a self-centering assembly, and the self-centering assembly is provided with a connecting rod linkage mechanism for driving the side wall to radially expand through axial movement and is used for locking the device in the center of the blast hole; An air leakage component is arranged between the explosion-proof tail shell and the anti-impact head shell, and is provided with an automatic opening structure which is triggered by impact wave pressure and is physically separated, and the automatic opening structure is used for releasing internal high-pressure gas; the anti-impact head is characterized in that a guide post is arranged in the anti-impact head shell, and a variable cross-section accelerating channel for rectifying and reducing pressure of the invading gas is arranged in the guide post. As a further technical scheme of the invention, the connecting rod linkage mechanism of the self-centering assembly comprises an operating rod sleeved in the explosion-proof tail shell in a sliding way and a movable plate fixed at the top end of the operating rod; The bottom end of the movable plate is circumferentially hinged with a plurality of first fixing seats, each first fixing seat is rotationally connected with a second fixing seat through a supporting rod, and the outer side of each second fixing seat is connected with a mounting rod; The side wall of the explosion-proof tail shell is provided with a hole site for the installation rod to pass through, and the tail end of the installation rod is fixed with a supporting plate positioned at the outer side of the shell; the movable plate is driven to displace by pushing the operating rod, so that the supporting plate is driven to open outwards radially. As a further technical scheme of the invention, the self-centering assembly further comprises an elastic reset mechanism, wherein the elastic reset mechanism comprises a fixed sleeve and a reset rod penetrating through the fixed sleeve; One end of the reset rod is connected with the movable plate, the other end of the reset rod is provided with a limiting plate, a reset spring which is in butt joint with the bottom of the limiting plate is arranged in the fixed sleeve, and the reset spring is used for driving the supporting plate to retract when the external force of the operating rod is removed. As a further technical scheme of the invention, the variable-section accelerating channel arranged in the guide column is a