Detonation velocity test probe

Abstract

The utility model discloses a detonation velocity test probe, which comprises a central probe body, a first metal layer and a second metal layer, the central probe body comprises a probe head with a conical front end and a probe column with a cylindrical rear end, the diameter of the bottom surface of the probe head is larger than that of the probe column, a first insulating layer is arranged on the outer side of the probe column, the first metal layer is arranged on the outer side of the first insulating layer, and the second metal layer is arranged on the outer side of the second insulating layer. A second insulating layer is arranged on the outer side of the first metal layer, the second metal layer is arranged on the outer side of the second insulating layer, a protective layer is arranged on the outer side of the second metal layer, the outer diameter of the protective layer is the same as the diameter of the bottom face of the needle head, and a handheld part is installed on the side, away from the needle head, of the needle column. According to the utility model, the first metal layer and the second metal layer are arranged at the outer side of the central probe body, so that the detonation wave transmission direction is vertical to the first metal layer and the second metal layer through user operation, the second metal layer is sleeved at the outer side of the first metal layer, the two same probes are arranged in parallel, and the distance between the parts of the probes is determined. And the measurement precision of the probe is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of detonation velocity testing equipment, in particular to a detonation velocity testing probe. Background Art

[0002] At present, the detonation velocity measurement of industrial explosives mainly includes electrical measurement method (probe) and continuous measurement method. The electrical measurement method is widely used in China, which uses 0.12mm-0.50mm enameled wire and handmade probes. In the production process, the probes are often damaged or unable to measure valid data due to improper operation. The utility model patent with announcement number: CN217954466U discloses a disposable probe, whose internal measuring element still uses enameled wire, which is placed in the shell in a spiral manner. It does not explain how to deal with the end of the enameled wire, and the existence of the shell will affect the accuracy of the detonation velocity measurement to a certain extent.

[0003] The probe type currently used in the test is the "break-on" type, that is, the two metal wires of the probe are insulated from each other before the test. When the detonation wave is transmitted to the probe position, the high temperature and high pressure of the detonation make the two metal wires that were originally insulated from each other connected. At this time, the detection instrument obtains a jump signal, and when it is transmitted to the next probe, a jump signal is also obtained. The instrument records the time interval between the two jump signals. The distance between the two probes is measured before the test, and the detonation velocity is obtained by dividing the distance between the probes by the time it takes for the detonation wave to be transmitted between the two probes.

[0004] Therefore, during the measurement process, the two metal wires in the important probe should be as close as possible and kept perpendicular to the transmission direction of the detonation wave. The metal wires in the probe disclosed in the utility model with announcement number: CN217954466U are placed in the outer shell in a spiral manner. To a certain extent, it is impossible to accurately measure the distance between the metal wires of the two probes. At the same time, the external metal shell will also cause interference to a certain extent, and it is also difficult to make the metal wires in the two probes completely parallel. Utility Model Content

[0005] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one purpose of the utility model is to provide a detonation velocity test probe, which simplifies the operation and improves the measurement accuracy of the probe.

[0006] According to the utility model, a detonation velocity test probe is proposed, including a central needle body, a first metal layer and a second metal layer, the central needle body includes a needle head with a conical front end and a needle column with a cylindrical rear end, the bottom diameter of the needle head is larger than the diameter of the needle column, a first insulating layer is provided on the outside of the needle column, the first metal layer is provided on the outside of the first insulating layer, a second insulating layer is provided on the outside of the first metal layer, the second metal layer is provided on the outside of the second insulating layer, a protective layer is provided on the outside of the second metal layer, the outer diameter of the protective layer is the same as the bottom diameter of the needle head, a hand-held part is installed on the side of the needle column away from the needle head, and a tail connecting line for an external test instrument is provided on the side of the first metal layer and the second metal layer close to the hand-held part.

[0007] Preferably, the length of the first metal layer is greater than that of the second metal layer, the length of the second metal layer is greater than the diameter of the tested sample, and the projection of the second metal layer along the needle column axis is within the projection range of the first metal layer along the needle column axis.

[0008] Preferably, the cross section of the hand-held portion along a plane perpendicular to the needle column axis is a square, and a side of the hand-held portion close to the needle head is provided with an inwardly concave arc surface.

[0009] Preferably, the material of the central needle body is high-strength metal, the material of the protective layer is a strong material with insulating properties, and the material of the hand-held part is a polymer material with insulating properties.

[0010] The beneficial effects of the utility model are as follows: by arranging the first metal layer and the second metal layer outside the central needle body, it is convenient for users to operate so that the transmission direction of the detonation wave is perpendicular to the second metal layer and the first metal layer, and the second metal layer is sleeved on the outside of the first metal layer. During the transmission of the detonation wave, the second metal layer is connected to the first metal layer. The two metal layers are equivalent to two groups of probes. Two identical probes are placed in parallel. The distance between the parts of the probes is determined, thereby improving the measurement accuracy of the probes. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In the attached picture:

[0012] Figure 1 This is a structural schematic diagram of a detonation velocity test probe proposed by the utility model;

[0013] Figure 2 The utility model proposed Figure 1 Cross-sectional view of AA in the middle;

[0014] Figure 3 The utility model proposed Figure 1 Cross-section of the middle BB;

[0015] Figure 4This is a structural schematic diagram of a second embodiment of the detonation velocity test probe proposed by the utility model;

[0016] Figure 5 The utility model proposed Figure 4 Cross-sectional view of CC.

[0017] In the figure: 1-center needle body, 2-first insulating layer, 3-first metal layer, 4-second insulating layer, 5-second metal layer, 6-protective layer, 7-tail connecting wire, 8-hand-held part. DETAILED DESCRIPTION

[0018] Reference Figure 1 and Figure 2 A detonation velocity test probe comprises a central needle body 1, a first insulating layer 2, a first metal layer 3, a second insulating layer 4, a second metal layer 5, a protective layer 6, a tail connecting line 7, and a hand-held part 8. The first metal layer 3 and the second metal layer 5 are the detection body of the probe.

[0019] The central needle body 1 is made of high-strength metal, with a conical top and a gear-shaped end. The diameter of the top cone is larger than the cylindrical diameter of the central needle body 1. The cylindrical part of the central needle body 1 is distributed outward in sequence as the first insulating layer 2, the first metal layer 3, the second insulating layer 4, the second metal layer 5, and the protective layer 6, wherein the second metal layer 5 is shorter than the first metal layer 3 and the two are separated by the second insulating layer 4. The length of the first metal layer 3 is smaller than the length of the cylindrical part of the central needle body 1 and the two are separated by the first insulating layer 2. The first insulating layer 2, the second insulating layer 4, and the protective layer 6 at both ends of the cylindrical part of the central needle body 1 are fused with each other, wherein the protective layer 6 is made of a solid material with insulating properties, which can protect the second metal layer 5.

[0020] At the end of the central needle body 1, the tail connection wire 7 is led out by the first metal layer 3 and the second metal layer 5, respectively. The tail connection wire 7 is made of 0.1mm-0.5mm insulated copper wire and is connected to the first metal layer 3 and the second metal layer 5 by welding or crimping. The tail connection wires 7 between different metal layers are insulated from each other and are used to connect to the signal line of the test instrument. The length of the second metal layer 5 is greater than the diameter of the sample being tested.

[0021] Reference Figure 3 The cross section of the hand-held part 8 is square and is made of a polymer material with insulating properties. It is tightly combined with the end of the cylindrical part of the central needle body 1, which is convenient for the operator to take the probe. There is a certain curvature on the surface facing the top of the central needle body 1, making it easier to fix on the surface of the sample.

[0022] When the detonation is transmitted to the probe, the second metal layer 5 and the first metal layer 3 are short-circuited first, and the detection instrument can obtain a transition signal.

[0023] Reference Figure 4 and Figure 5 , Figure 4 and Figure 5 The second implementation scheme of this application

[0024] Similar to the first solution, the central needle body 1 and the first metal layer 3 are used as the subject of detection, and the second insulating layer 4 and the second metal layer 5 are reduced. It includes a central needle body 1, a first insulating layer 2, a first metal layer 3, a protective layer 6, a tail connecting line 7, and a handheld part 8.

[0025] The cylindrical part of the central needle body 1 is plated with copper (or silver) to reduce resistance and improve detection sensitivity. A tail connecting wire 7 is led out at its end. The same first metal layer 3 leads out a second tail connecting wire 7 at the end for connecting to the test line of the detection instrument.

[0026] When the detonation is transmitted to the probe, the first metal layer 3 and the central needle body 1 are short-circuited first, and the detection instrument can obtain a jump signal.

[0027] The metal layers are all made of copper or other low resistivity materials.

Claims

1. A detonation velocity test probe, characterized in that: The invention comprises a central needle body (1), a first metal layer (3) and a second metal layer (5), wherein the central needle body (1) comprises a needle head with a conical front end and a needle column with a cylindrical rear end, wherein the bottom diameter of the needle head is larger than the diameter of the needle column, a first insulating layer (2) is arranged on the outside of the first insulating layer (2), a second insulating layer (4) is arranged on the outside of the first metal layer (3), the second metal layer (5) is arranged on the outside of the second insulating layer (4), a protective layer (6) is arranged on the outside of the second metal layer (5), the outer diameter of the protective layer (6) is the same as the bottom diameter of the needle head, a hand-held part (8) is installed on the side of the needle column away from the needle head, and a tail connecting line (7) for externally connecting a test instrument is arranged on the side of the first metal layer (3) and the second metal layer (5) close to the hand-held part (8).

2. A detonation velocity test probe according to claim 1, characterized in that: The length of the first metal layer (3) is greater than the length of the second metal layer (5), the length of the second metal layer (5) is greater than the diameter of the sample being tested, and the projection of the second metal layer (5) along the needle column axis is within the projection range of the first metal layer (3) along the needle column axis.

3. A detonation velocity test probe according to claim 1, characterized in that: The cross section of the hand-held portion (8) along the plane perpendicular to the needle column axis is a square, and a side of the hand-held portion (8) close to the needle head is provided with an inwardly concave arc surface.

4. A detonation velocity test probe according to claim 1, characterized in that: The material of the central needle body (1) is a high-strength metal, the material of the protective layer (6) is a strong material with insulating properties, and the material of the hand-held part (8) is a polymer material with insulating properties.

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