Continuous detonation velocity measurement system and method based on time domain reflection technology

Abstract

The invention discloses a continuous detonation velocity measurement system and method based on a time domain reflection technology, and the method specifically comprises the following steps: S1, placing one end of a measuring line cable in a to-be-measured blast hole, and enabling the other end of the measuring line cable to pass through a connection box and a signal transmission line in sequence, and then to be connected with a first interface (5) of a measurement system; s2, detecting whether the connection is normal or not, if so, displaying green for the signal lamp, and entering S3; if not, the signal lamp displays red, and the measuring cable is detected; s3, N reference pulse signals are transmitted to the measuring cable through a pulse generator module, and the average speed V of the reference pulse signals is obtained; and S4, calculating the detonation velocity according to the average velocity of the reference pulse signals.

Description

Technical Field

[0001] The invention relates to the technical field of engineering blasting, and in particular to a continuous detonation velocity measurement system and method based on time domain reflection technology. Background Art

[0002] Engineering blasting plays a key role in resource exploitation and infrastructure construction. Explosives are the main means of rock breaking, so the performance of explosives affects the quality and effect of blasting. As an important indicator for measuring the performance of explosives, detonation velocity is currently mainly measured by point measurement. However, due to the limitations of the measurement principle, the test results are often unstable, and the accuracy of the measurement results cannot be guaranteed. Summary of the invention

[0003] In view of the problem of low accuracy in detonation velocity measurement in the prior art, the present invention proposes a continuous detonation velocity measurement system and method based on time domain reflection technology, which detects the time and distance information of the continuous fuse section of the measuring line cable under the action of explosive blasting, thereby obtaining the stable detonation velocity of the explosive. This system and method can not only effectively and continuously measure the detonation velocity of the explosive, but also effectively solve the problem of detonation velocity measurement of different densities of explosives in the hole, thereby improving the accuracy of detonation velocity measurement.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A continuous detonation velocity measurement system based on time domain reflection technology comprises a housing 1, wherein a display screen 2 and a first interface 5 for transmitting and receiving pulse signals are arranged on the front of the housing 1; a pulse generator module 9 for generating pulse signals, a central processing unit module 11 for calculating detonation velocity, a data display module 12 for transmitting detonation velocity, and a time recording module 13 for recording pulse signal emission time and emission time are arranged inside the housing 1;

[0006] The pulse generator module 9, the time recording module 13 and the central processing unit module 11 are bidirectionally connected; the second output end of the central processing unit module 11 is connected to the input end of the data display module 12; the pulse generator module 9 is also connected to the first interface 5; the output end of the data display module 12 is connected to the display screen 2.

[0007] Preferably, the display screen 2 is provided with an operation area 3, a display area and a signal light 4;

[0008] The display area is used to display the frequency, time and detonation speed of the pulse signal; the operation area 3 is used to perform key operations; and the signal light 4 is used to display the operating status.

[0009] Preferably, the side of the housing 1 is provided with a second interface 6, a third interface 7 and a power switch 8;

[0010] The second interface 6 is used to connect to an external storage device via a USB data cable;

[0011] The third interface 7 is used to connect a power adapter for charging;

[0012] The power switch 8 is used to start or shut down the system.

[0013] Preferably, a data output module 10 and a power supply module 14 are further disposed inside the housing 1 ; the data output module 10 is connected to an external storage device via the second interface 6 .

[0014] Preferably, the housing 1 is made of metal or ABS material; buffer plastic is arranged between the modules inside the housing 1.

[0015] The present invention also provides a continuous detonation velocity measurement method based on time domain reflection technology, which specifically comprises the following steps:

[0016] S1: placing one end of the measuring cable in the blasthole to be measured, and then connecting the other end of the measuring cable to the first interface 5 of the measuring system through a connection box and a signal transmission line in sequence;

[0017] S2: Check whether the connection is normal. If it is, the signal light will turn green and enter S3; if not, the signal light will turn red and the test cable will be tested;

[0018] S3: transmitting N reference pulse signals to the measuring cable through the pulse generator module to obtain the average speed V of the reference pulse signals;

[0019] S4: Calculate the detonation velocity based on the average velocity of the reference pulse signal.

[0020] Preferably, in S1, the measuring line cable is multi-channel.

[0021] Preferably, S3 includes:

[0022] S3-1: The pulse generator module generates N reference pulse signals and sends them to the measurement line cable. The time from the reference pulse signal to the reflected signal is recorded to obtain the time set Δt1, Δt2, ..., Δt n}, Δt n Indicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal;

[0023] S3-2: Calculate the average speed of the reference pulse signal based on the elapsed time.

[0024]

[0025] In formula (1), V represents the average speed of the reference pulse signal; Vn Indicates the speed of the nth reference pulse signal; N indicates the number of reference pulse signals; L indicates the length of the measuring cable; Δt n Indicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal.

[0026] Preferably, the S4 includes:

[0027] S4-1: Calculate the explosive detonation distance based on the average speed of the reference pulse signal:

[0028] ΔL=L0-L1 (2)

[0029]

[0030] In formulas (2), (3) and (4), ΔL represents the explosive detonation distance; L0 represents the cable length of the measuring line at section 0; V represents the average velocity of the reference pulse signal; T0 represents the emission time of the reference pulse signal to section 0; Indicates the reflection time of the reference pulse signal transmitted to Section 0; L1 indicates the length of the measuring line cable of Section 1; V indicates the average speed of the reference pulse signal; T1 indicates the transmission time of the reference pulse signal to Section 1; Indicates the reflection time of the reference pulse signal transmitted to section 1;

[0031] S4-2: Calculate the detonation velocity based on the detonation distance of the explosive:

[0032]

[0033] In formula (5), V 0→1 It represents the detonation velocity of the explosive from section 0 to section 1; ΔL represents the detonation distance of the explosive; T0 represents the emission time of the reference pulse signal to section 0; T1 represents the emission time of the reference pulse signal to section 1.

[0034] In summary, due to the adoption of the above technical solution, compared with the prior art, the present invention has at least the following beneficial effects:

[0035] 1. The present invention only needs to place the measuring cable in the blast hole to transmit the pulse signal, thereby realizing the measurement of the detonation velocity, which will not be affected by external physical conditions. Therefore, it can be applied to the accurate measurement of the detonation velocity of continuous explosives in blast holes under different working conditions, different apertures and different geological conditions;

[0036] 2. The present invention calculates the average propagation speed of multiple pulse signals in the measured cable, thereby avoiding inaccurate propagation speed due to random errors, and the acquired pulse propagation speed is more reliable, further improving the accuracy of explosion velocity measurement;

[0037] 3. The present invention transmits high-frequency narrow-band rectangular pulses through a pulse generator module to reduce the influence of the external environment on the detonation velocity measurement results;

[0038] 4. The present invention can realize simultaneous measurement of detonation velocity of explosives in multiple holes by connecting the measuring line cables through multiple channels. Description of the drawings:

[0039] Figure 1 Schematic diagram of the exterior of a continuous detonation velocity measurement system based on time domain reflection technology according to an exemplary embodiment of the present invention.

[0040] Figure 2 Schematic diagram of the interior of a continuous detonation velocity measurement system based on time domain reflection technology according to an exemplary embodiment of the present invention.

[0041] Figure 3 Schematic diagram of a continuous detonation velocity measurement method based on time domain reflection technology according to an exemplary embodiment of the present invention.

[0042] Figure 4 Schematic diagram of a blasthole cross section according to an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further described in detail below in conjunction with the examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following examples, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0044] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] like Figure 1 As shown, the present invention provides a continuous detonation velocity measurement system based on time domain reflection technology, including a shell 1; a display screen 2 and a first interface 5 are arranged on the front of the shell 1, and an operation area 3, a display area and a signal light 4 are arranged on the display screen 2; a second interface 6, a third interface 7 and a power switch 8 are arranged on the side of the shell 1.

[0046] In this embodiment, the display area of ​​the display screen 2 is used to display the transmission frequency, time, fitting curve and other information of the data signal; the operation area 3 is used to perform key operations (for example, the transmission frequency, time interval, fitting curve and other operations can be selected by the left, right and confirmation keys); the signal light 4 is used to display whether the device is operating normally, such as a green light for normal operation, a yellow light for a circuit breaker, and a red light for a fault.

[0047] The first interface 5 is a test interface, used for transmitting and receiving pulse signals;

[0048] The second interface 6 is a data interface, which can be used to connect a USB data cable and an external storage device;

[0049] The third interface 7 is a charging interface, which is used to connect a power adapter to charge the device.

[0050] The power switch 8 is used to start or shut down the system.

[0051] In this embodiment, the material of the housing 1 can be metal or ABS (Acrylonitrile Butadiene Styrene), which can withstand the characteristics of impact resistance, high temperature resistance, waterproofness, and wear resistance in the blasting environment. The internal buffer plastic composed of high-density foam can absorb the blasting vibration and the impact of flying stones, protect the normal operation of the internal module, and ensure the measurement stability.

[0052] like Figure 2 As shown, in this embodiment, a pulse generator module 9, a data output module 10, a central processing unit module 11, a data display module 12, a time recording module 13 and a power supply module 14 are arranged inside the shell 1; wherein, the pulse generator module 9, the time recording module 13 and the central processing unit module 11 are bidirectionally connected, a first output end of the central processing unit module 11 is connected to an input end of the data output module 10, a second output end of the central processing unit module 11 is connected to an input end of the data display module 12, and an output end of the power supply module 14 is connected to a voltage end of the central processing unit module 11.

[0053] In this embodiment, the pulse generator module 9 is used to generate a high-frequency pulse signal and transmit it to each section of the blasthole through the first interface 5, while receiving the pulse signal reflected at each section of the blasthole; that is, the pulse generator module 9 is connected to the first interface 5.

[0054] A time recording module 13, used to continuously record the time of pulse emission and reflection;

[0055] The central processing unit module 11 is used to calculate the detonation velocity of the explosive according to the pulse signal reflected at each section and the time;

[0056] The power supply module 14 is used to provide stable power supply for each module;

[0057] The data display module 12 is used to display the detonation velocity output by the central processing unit module 11 on the display screen 2, so that the technicians can view it intuitively;

[0058] The data output module 10 may adopt Bluetooth to transmit the detonation velocity output by the central processing module 11 to an external device (such as a computer, etc.) through the second interface 6 or wirelessly.

[0059] Based on the above-mentioned continuous detonation velocity measurement system based on time domain reflection technology, such as Figure 3 As shown, the present invention also provides a continuous detonation velocity measurement method based on time domain reflection technology, which specifically includes the following steps:

[0060] S1: Place one end of the measuring line cable in the borehole to be measured, and then connect the other end of the measuring line cable to the first interface 5 of the measuring system through a connecting box and a signal transmission line in sequence, so that the pulse generator module 9 can transmit the generated high-frequency pulse signal to each section of the borehole and receive the pulse signal reflected at each section of the borehole.

[0061] In this embodiment, one end of the measuring line cable (with a length of L, i.e., the part below the blocking section) is fixed on the detonating wire (which can be wrapped with adhesive tape) at a distance d above the explosive package, d=30-50cm (to prevent the measuring line cable from being destroyed by the instantaneous high temperature and high pressure generated when the explosive package is detonated), and is placed in the blast hole together with the detonating wire. The measuring line cable is straightened, and after the blast hole is filled with explosives, a part of the detonating wire is placed outside the blast hole after the blocking section is encapsulated to facilitate the ignition of the explosive package.

[0062] In this embodiment, the measuring line cable may be multi-channel, so as to achieve simultaneous measurement of the detonation velocity of explosives in multiple holes.

[0063] S2: Open the connection test option through the operation panel to check whether the connection is normal. If it is, the signal light will turn green and enter S3; if not, the signal light will turn red and the test cable will be tested.

[0064] S3: Generate N reference pulse signals through the pulse generator module, perform pulse signal propagation speed test and correction on the test line cable (fixed length L), and obtain the average speed V of the reference pulse signal.

[0065] S3-1: The pulse generator module generates N reference pulse signals and sends them to the measurement line cable. The time from the reference pulse signal to the reflected signal is recorded to obtain the time set Δt1, Δt2, ..., Δt n}, Δt nIndicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal;

[0066] In this embodiment, the reference pulse signal is a high-frequency narrow-band rectangular pulse (which can reduce the influence of the external environment on the detonation velocity measurement result), and the pulse width is 1-10ns.

[0067] like Figure 4 As shown, when the explosive explodes (the direction of detonation propagation is from bottom to top), the measuring line cable is continuously fused under the action of the explosion, so that N sections (section 0, section 1, section 2, section 3, ..., section n) appear continuously from bottom to top. When the continuous reference pulse signal reaches the section, a reflected pulse signal will be formed. The reflected pulse signal passes through the connection box, the signal transmission line, and the first interface 5 of the measuring system in sequence and then enters the central processing unit module 11. At the same time, the time recording module 13 continuously records the reception time of the reflected signal.

[0068] S3-2: Calculate the average speed of the reference pulse signal based on the elapsed time.

[0069]

[0070] In formula (1), V represents the average speed of the reference pulse signal; V n Indicates the speed of the nth reference pulse signal; N indicates the number of reference pulse signals; L indicates the length of the measuring cable; Δt n Indicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal.

[0071] In this embodiment, by calculating the average propagation speed of multiple pulse signals in the measured cable, inaccurate propagation speed caused by random errors is avoided, the acquired pulse propagation speed is more reliable, and the accuracy of explosion velocity measurement is further improved.

[0072] S4: Calculate the detonation velocity based on the average velocity of the reference pulse signal.

[0073] S4-1: Calculate the detonation distance of the explosive based on the average speed of the reference pulse signal.

[0074] When the reference pulse signal propagates to section 0 (cable end point), record the reference pulse signal emission time T0 and the corresponding pulse reflection time Then the length of the measuring cable at this time is:

[0075]

[0076] In formula (2), L0 represents the cable length of the measuring line at section 0; V represents the average speed of the reference pulse signal; T0 represents the transmission time of the reference pulse signal to section 0; Indicates the reflection time of the reference pulse signal transmitted to section 0;

[0077] When the reference pulse signal propagates to section 1, record the reference pulse signal emission time T1 and the corresponding pulse reflection time Then the length of the measuring cable at this time is:

[0078]

[0079] In formula (3), L1 represents the cable length of the measuring line of section 1; V represents the average speed of the reference pulse signal; T1 represents the transmission time of the reference pulse signal to section 1; Indicates the reflection time of the reference pulse signal transmitted to section 1;

[0080] Then the calculation of explosive detonation distance is:

[0081] ΔL=L0-L1 (4)

[0082] In formula (4), ΔL represents the detonation distance of the explosive.

[0083] S4-2: Calculate the detonation velocity based on the detonation distance of the explosive:

[0084]

[0085] In formula (5), V 0→1 It represents the detonation velocity of the explosive from section 0 to section 1; ΔL represents the detonation distance of the explosive; T0 represents the emission time of the reference pulse signal to section 0; T1 represents the emission time of the reference pulse signal to section 1.

[0086] In this embodiment, the central processing unit calculates the time and distance data of the pulse signal of the continuous detonation fuse section (0, 1, 2, 3...n), generates a time and distance scatter plot, performs linear fitting and finally obtains a continuous detonation velocity curve.

[0087] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A continuous detonation velocity measurement system based on time domain reflection technology, comprising a housing (1), characterized in that: The front of the housing (1) is provided with a display screen (2) and a first interface (5) for transmitting and receiving pulse signals; the interior of the housing (1) is provided with a pulse generator module (9) for generating pulse signals, a central processing unit module (11) for calculating detonation velocity, a data display module (12) for transmitting detonation velocity, and a time recording module (13) for recording pulse signal emission time and emission time; The pulse generator module (9), the time recording module (13) and the central processing unit module (11) are bidirectionally connected; the second output end of the central processing unit module (11) is connected to the input end of the data display module (12); the pulse generator module (9) is also connected to the first interface (5); and the output end of the data display module (12) is connected to the display screen (2).

2. A continuous detonation velocity measurement system based on time domain reflection technology as claimed in claim 1, characterized in that: The display screen (2) is provided with an operation area (3), a display area and a signal light (4); The display area is used to display the frequency and time of the pulse signal and the detonation speed of the explosive; the operation area (3) is used to perform key operations; and the signal light (4) is used to display the operating status.

3. A continuous detonation velocity measurement system based on time domain reflection technology as claimed in claim 1, characterized in that: A second interface (6), a third interface (7) and a power switch (8) are provided on the side of the housing (1); A second interface (6) is used to connect to an external storage device via a USB data cable; A third interface (7), used for connecting a power adapter for charging; The power switch (8) is used to start or shut down the system.

4. A continuous detonation velocity measurement system based on time domain reflection technology as claimed in claim 1, characterized in that: A data output module (10) and a power supply module (14) are also arranged inside the housing (1); the data output module (10) is connected to an external storage device via a second interface (6).

5. A continuous detonation velocity measurement system based on time domain reflection technology as claimed in claim 1, characterized in that: The shell (1) is made of metal or ABS material; buffer plastic is arranged between the modules inside the shell (1).

6. A method for continuous detonation velocity measurement based on time domain reflection technology based on the system according to any one of claims 1 to 5, characterized in that: The specific steps include: S1: placing one end of the measuring cable in the blasthole to be measured, and then connecting the other end of the measuring cable to the first interface (5) of the measuring system through a connection box and a signal transmission line in sequence; S2: Check whether the connection is normal. If it is, the signal light will turn green and enter S3; if not, the signal light will turn red and the test cable will be tested; S3: transmitting N reference pulse signals to the measuring cable through the pulse generator module to obtain the average speed V of the reference pulse signals; S4: Calculate the detonation velocity based on the average velocity of the reference pulse signal.

7. A method for continuous detonation velocity measurement based on time domain reflection technology as claimed in claim 6, characterized in that: In S1, the measuring line cable is multi-channel.

8. The method for continuous detonation velocity measurement based on time domain reflection technology as claimed in claim 6, characterized in that: The S3 includes: S3-1: The pulse generator module generates N reference pulse signals and sends them to the measurement line cable. The time from the reference pulse signal to the reflected signal is recorded to obtain the time set Δt1, Δt2, ..., Δt n }, Δt n Indicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal; S3-2: Calculate the average speed of the reference pulse signal based on the elapsed time. In formula (1), V represents the average speed of the reference pulse signal; V n Indicates the speed of the nth reference pulse signal; N indicates the number of reference pulse signals; L indicates the length of the measuring cable; Δt n Indicates the time from sending the nth reference pulse signal to receiving the corresponding reflected signal.

9. The method for continuous detonation velocity measurement based on time domain reflection technology according to claim 6, characterized in that: The S4 includes: S4-1: Calculate the explosive detonation distance based on the average speed of the reference pulse signal: ΔL=L0-L1 (2) In formulas (2), (3) and (4), ΔL represents the explosive detonation distance; L0 represents the cable length of the measuring line at section 0; V represents the average velocity of the reference pulse signal; T0 represents the emission time of the reference pulse signal to section 0; Indicates the reflection time of the reference pulse signal transmitted to Section 0; L1 indicates the length of the measuring line cable of Section 1; V indicates the average speed of the reference pulse signal; T1 indicates the transmission time of the reference pulse signal to Section 1; Indicates the reflection time of the reference pulse signal transmitted to section 1; S4-2: Calculate the detonation velocity based on the detonation distance of the explosive: In formula (5), V 0→1 It represents the detonation velocity of the explosive from section 0 to section 1; ΔL represents the detonation distance of the explosive; T0 represents the emission time of the reference pulse signal to section 0; T1 represents the emission time of the reference pulse signal to section 1.

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