Testing device based on enameled wire core coaxial cable and use method

Abstract

The invention discloses a testing device based on an enameled wire core coaxial cable and a using method, the testing device comprises a coaxial line, the coaxial line comprises an inner core and a shell, the inner core is an enameled wire, one end of the inner core is connected with an electric probe, one end of the coaxial line far away from the electric probe is provided with a coaxial connector, and the coaxial connector is connected with the shell. A heat shrink tube is arranged at one end, close to the coaxial line, of the coaxial connector, and the coaxial line is fixedly connected with the coaxial connector through the heat shrink tube. The beneficial effects are that self inductance of the cable and mutual inductance between the cables are reduced, signal leading edge quality of the electric probe is improved, and electric measurement time precision is improved; the anti-electromagnetic interference performance of the electric probe cable is improved, the problem that a traditional electric probe wiring process cannot be self-checked is solved, state calibration of the connection state is carried out through a signal reflection method, whether wiring is good or not is judged, and therefore the full-link self-checking function of a signal transmission system of an electric testing system is achieved.

Description

Technical Field

[0001] The invention relates to the field of enameled wire core coaxial cables, and in particular to a testing device based on enameled wire core coaxial cables and a use method thereof. Background Art

[0002] Enameled wire refers to an insulated wire formed by coating one or more layers of insulating paint on the surface of a conductive metal wire and then undergoing processes such as drying and curing. Common conductive materials include copper and aluminum.

[0003] Various types of electric probes used in detonation experiments (including steel pipe probes, drum probes, insulating plug probes, etc.) mostly use enameled wires (consisting of a conductor and an insulating layer. The bare wire is annealed and softened, and then painted multiple times). When connecting with the test system during the experiment, the end of the enameled wire needs to be manually polished and painted with sandpaper, and the core wire and ground wire at the end of the electric probe are connected to the core wire and ground wire of the test system by twisting the cables at both ends, and the core wire connection is insulated by sticking and fixing the insulating sleeve.

[0004] Existing enameled wires are susceptible to electromagnetic interference, resulting in interference noise signals in the electrical probe signal; if the enameled wire is too long, there will be problems with the cable's own inductance and the mutual inductance between cables, which can easily cause the front edge of the electrical probe discharge signal to slow down. Summary of the invention

[0005] The purpose of the present invention is to provide a testing device and a method for using an enameled wire coaxial cable to solve the technical problem that the exposed enameled wire is susceptible to electromagnetic interference, resulting in interference noise signals in the electrical probe signal.

[0006] To solve the above technical problems, the present invention provides a testing device and a method of use based on an enameled wire core coaxial cable, which includes a coaxial line, the coaxial line includes an inner core and an outer shell, the inner core is an enameled wire, one end of the inner core is connected to an electrical probe, and a coaxial connector is provided on the end of the coaxial line away from the electrical probe.

[0007] Furthermore, a heat shrink tube is provided at one end of the coaxial connector close to the coaxial line, and the coaxial line is fixedly connected to the coaxial connector via the heat shrink tube.

[0008] Furthermore, the length of the coaxial line is 1m-2m.

[0009] Furthermore, the inner core on the coaxial line close to one end of the electric probe is in an exposed state, and the exposed length of the inner core on the coaxial line close to one end of the electric probe is 10 cm-60 cm.

[0010] Furthermore, the outer shell and the inner core of the coaxial line are fixed, and one end of the exposed section of the inner core close to the outer shell is glued to the outer shell for curing.

[0011] Furthermore, the outer shell includes an insulating layer, an outer conductor layer, and a sheath; the inner core is sequentially covered with the insulating layer, the outer conductor layer, and the sheath from the inside to the outside, and the outer conductor layer is provided with a ground wire.

[0012] Furthermore, the ground wire is arranged at one end of the outer conductor layer close to the exposed section of the inner core, and the length of the ground wire is 3 cm to 10 cm.

[0013] A detonation velocity test method is based on a test device based on an enameled wire core coaxial cable, characterized in that:

[0014] Step 1: One end of the coaxial line is connected to an electric probe, and the other end is connected to a signal forming circuit, and the signal forming circuit is connected to an oscilloscope.

[0015] Step 2: The electric probe is attached to the surface of the explosive. In the initial state, the electric probe test circuit is in an open circuit state. In this state, the power supply charges the capacitor;

[0016] Step 3: The detonation wave reaches the ionization state of the detonation product on the surface of the explosive, the positive and negative electrodes of the electric probe are turned on, the electric probe test circuit is short-circuited, the capacitor begins to discharge, and a voltage pulse signal is generated at both ends of the resistor. The leading edge starting time of the pulse signal is the time when the detonation wave reaches the surface of the explosive;

[0017] Step 4: The pulse signal is transmitted to the oscilloscope via the cable.

[0018] The beneficial effects of the present invention are: a testing device based on an enameled wire core coaxial cable,

[0019] (1) Improve the wiring speed of the electric probe from about 1 to 2 wires / minute to 10 to 20 wires / minute, and reduce the number of wiring personnel required from 3 to 4 people / group to 2 to 3 people / group;

[0020] (2) Reduce the cable's own inductance and the mutual inductance between cables, improve the signal front quality of the electrical probe, and improve the electrical measurement time accuracy;

[0021] (3) Improve the anti-electromagnetic interference performance of the electric probe cable, eliminate the copper mesh wrapping process, and reduce production costs;

[0022] (4) To solve the problem that the traditional electrical probe wiring process cannot be self-checked, the connection status is calibrated through the signal reflection method to determine whether the wiring is good, thereby realizing the full-link self-check function of the signal transmission system of the electrical measurement system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the enameled wire core coaxial cable.

[0024] Figure 2Schematic diagram of connecting an electrical probe to an enameled coaxial cable.

[0025] Figure 3 This is a magnified schematic diagram of the electrical probe.

[0026] Figure 4 Schematic diagram of the electrical probe testing technique circuit.

[0027] Figure 5 Form a circuit for the electrical probe and the signal.

[0028] Figure 6 This is the waveform of the electrical probe impact response.

[0029] Among them: 1. enameled wire; 2. insulation layer; 3. outer conductor layer; 31. tinned copper outer conductor layer; 32. copper foil outer conductor layer; 4. sheath; 5. coaxial connector; 6. coaxial line; 7. ground wire; 8. probe; 9. heat shrink tube. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiment is only one embodiment of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0031] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] In the following description, references to "one embodiment", "an embodiment", "an example", "an example", etc. indicate that the embodiment or example described in this way may include specific features, structures, characteristics, properties, elements or limitations, but not every embodiment or example necessarily includes the specific features, structures, characteristics, properties, elements or limitations. In addition, repeated use of the phrase "according to one embodiment of the present application" may refer to the same embodiment, but does not necessarily refer to the same embodiment.

[0033] The content of this embodiment 1 is as follows: Figure 1 As shown, it includes a coaxial line 6, the inner core of the coaxial line 6 is an enameled wire 1, and a layer of insulating varnish is coated on the outside of the entire cable, which enhances the insulation performance and mechanical strength of the enameled wire 1. The flexibility and corrosion resistance of the enameled wire 1 are improved, and its service life is extended;

[0034] Insulation layer 2, the insulation layer 2 covers the enameled wire 1, and is used to isolate the enameled wire 1 and the outer conductor layer 3 to prevent electrical signal leakage or mutual interference. The insulation layer 2 material generally has good electrical and mechanical properties to ensure the stability and reliability of the enameled wire 1;

[0035] The outer conductor layer 3 is covered around the insulating layer 2; the outer conductor layer 3 includes a tinned copper outer conductor layer 31 and a copper foil outer conductor layer 32, and the outer conductor is wrapped outside the insulating layer 2 to form a coaxial structure. It has good shielding performance, can resist the interference of external electromagnetic waves, protect the internally transmitted electrical signals, reduce the inductance of the enameled wire 1 itself and the mutual inductance between the enameled wires 1, improve the signal frontier quality of the electrical probe 8, and improve the electrical measurement time accuracy.

[0036] The sheath 4 covers the outer conductor layer 3 and is tightly wrapped with environmentally friendly PET to protect and fix the internal structure. Through the multiple protection and shielding of the enameled wire 1, the insulating layer 2 and the outer conductor layer 3, the high-precision transmission of the signal is ensured and the signal loss and interference are reduced.

[0037] One end of the enameled wire 1 is connected to an electric probe 8, and the enameled wire 1 on the coaxial line 6 near the end of the electric probe 8 is exposed. The transition position between the coaxial line 6 and the exposed enameled wire 1 is cured and glued, and the outer conductor layer 3 of the coaxial line 6 is connected to a ground wire 7. A coaxial connector 5 is provided on the end of the coaxial line 6 away from the electric probe 8. A heat shrink tube 9 is passed through the end of the coaxial connector 5 near the coaxial line 6, and the coaxial line 6 is pushed into the coaxial connector 5 along the heat shrink tube 9. The design of the curing glue and the heat shrink tube 9 enhances the mechanical strength and stability of the coaxial line 6 and prevents loosening and damage during use. The design of the coaxial connector 5 and the heat shrink tube 9 makes the coaxial line 6 easy to install and connect, and simplifies the installation operation steps. By setting the coaxial connector 5, the state calibration of the connection state can be realized by the signal reflection method to judge whether the wiring is good, effectively solving the problem that the wiring process of the traditional electric probe 8 cannot be self-checked, thereby realizing the full-link self-check function of the signal transmission system of the electrical measurement system.

[0038] like Figure 5 As shown; the other end of the coaxial connector 5 is connected to the signal forming circuit, and the signal forming circuit adopts a pulse forming differential circuit. The working principle of this circuit is as follows: before the experiment, a DC power supply of tens to hundreds of volts charges the capacitor C through the charging resistor R0. When the electric probe S is turned on, the capacitor C is discharged through S, R1, R2, and a differential voltage signal is generated on the resistor R2. A sharp pulse with a very steep rising front edge is transmitted to the oscilloscope or multi-channel time interval meter via a cable for recording. The signal forming circuit generates a voltage signal and transmits it to the oscilloscope.

[0039] The aperture D3 of the coaxial connector 5 is 4.5mm, the outer diameter D4 is 5mm, the coaxial connector 5 adopts the model MCX-K, the aperture of the heat shrink tube 9 is 2.5mm, the length is 16mm, the length L of the coaxial line 6 is 1m-2m, and the length of the coaxial line 6 is 1m-2m. Function: After the cable at the probe 8 end is connected with the test end cable, the cable length of the entire link is calibrated. From the waveform diagram of the length calibration, it can be fed back whether the coaxial cable at the probe 8 end and the test end cable are connected normally.

[0040] The insulating layer 2 is made of polyperfluoroethylene propylene or perfluoroalkoxy resin.

[0041] The exposed length D1 of the enameled wire 1 on the coaxial line 6 near the end of the electric probe 8 is 10cm-60cm. The role of the exposed length of the inner core: due to the particularity of the experimental device and the sealing requirements, it is necessary to perform glue sealing at the exposed inner core, and the glue is cured at the transition position between the exposed enameled wire 1 and the coaxial line 6. The outer conductor layer 3 at the transition position is connected to a ground wire 7, and the length of the ground wire 7 is 3cm to 10cm.

[0042] The cable wave impedance of the coaxial line 6 is 50Ω, which ensures a good match with most signal transmission equipment and improves the efficiency and quality of signal transmission; the sheath 4 adopts an environmentally friendly PET tape outer sheath.

[0043] Furthermore, a manufacturing method of a testing device based on an enameled wire core coaxial cable

[0044] The following steps are involved:

[0045] Step 1: Cut a coaxial line 6 with a length of 1m-2m;

[0046] Step 2: peel off the sheath 4, the outer conductor layer 3 and the insulating layer 2 on the coaxial line 6 near the end of the electric probe 8, the peeling length is 10cm-60cm, and the enameled wire 1 is exposed;

[0047] Step 3: Curing and dispensing glue at the transition position between the exposed enameled wire 1 and the coaxial line 6, and connecting the outer conductor layer 3 at the transition position with a ground wire 7, the length of which is 3 cm to 10 cm;

[0048] Step 4: A coaxial connector 5 is provided on the end of the coaxial line 6 away from the electrical probe 8, a heat shrink tube 9 is passed through the end of the coaxial connector 5 close to the coaxial line 6, and then the coaxial line 6 is pushed into the coaxial connector 5 along the heat shrink tube 9;

[0049] Step 5: The end of the enameled wire 1 is mounted with a steel pipe to obtain an electric probe 8 .

[0050] like Figure 4As shown, further; Application Example 1: A detonation velocity test method is based on a test device based on an enameled wire core coaxial cable, and the specific steps are as follows:

[0051] Step 1: One end of the coaxial line 6 is connected to the electric probe 8, and the other end is connected to the signal forming circuit, and the signal forming circuit is connected to the oscilloscope.

[0052] Step 2: The electric probe 8 is attached to the surface of the explosive. In the initial state, the test circuit of the electric probe 8 is in an open circuit state. In this state, the power supply charges the capacitor;

[0053] Step 3: The detonation wave reaches the ionization state of the detonation product on the surface of the explosive, the positive and negative electrodes of the electric probe 8 are connected, the test circuit of the electric probe 8 is short-circuited, the capacitor C starts to discharge, and the resistor R S A voltage pulse signal is generated at both ends, and the leading edge start time of the pulse signal is the time when the detonation wave reaches the surface of the explosive;

[0054] Step 4: The pulse signal is transmitted to the oscilloscope via the cable.

[0055] like Figure 5 As shown in the data chart: Analyzing the test results of the detonation experiment, there is no interference at the front end of the waveform of the enameled coaxial cable electric probe, the signal front quality is high, and the starting voltage amplitude is high, which is conducive to the interpretation of physicists and improves the accuracy of electrical measurement time.

[0056] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A test device based on an enameled wire core coaxial cable, characterized in that: The coaxial line comprises an inner core and an outer shell. The inner core is an enameled wire. One end of the inner core is connected to an electric probe. The end of the coaxial line away from the electric probe is provided with a coaxial connector.

2. A test device based on an enameled wire core coaxial cable according to claim 1, characterized in that: A heat shrink tube is arranged at one end of the coaxial connector close to the coaxial line, and the coaxial line is fixedly connected to the coaxial connector through the heat shrink tube.

3. A test device based on an enameled wire core coaxial cable according to claim 1, characterized in that: The length of the coaxial line is 1m-2m.

4. A test device based on an enameled wire core coaxial cable according to claim 1, characterized in that: The inner core on the coaxial line close to one end of the electric probe is in an exposed state, and the exposed length of the inner core on the coaxial line close to one end of the electric probe is 10 cm-60 cm.

5. A test device based on an enameled wire core coaxial cable according to claim 4, characterized in that: The outer shell of the coaxial line is fixed to the inner core, and one end of the exposed section of the inner core close to the outer shell is glued to the outer shell for curing.

6. A test device based on an enameled wire core coaxial cable according to claim 4, characterized in that: The shell comprises an insulating layer, an outer conductor layer and a sheath; the inner core is sequentially covered with the insulating layer, the outer conductor layer and the sheath from the inside to the outside, and the outer conductor layer is provided with a ground wire.

7. A test device based on an enameled wire core coaxial cable according to claim 6, characterized in that: The ground wire is arranged at one end of the outer conductor layer close to the exposed section of the inner core, and the length of the ground wire is 3 cm to 10 cm.

8. A method for testing explosion velocity is based on a testing device based on an enameled wire core coaxial cable according to any one of claims 1 to 7, characterized in that: Step 1: One end of the coaxial line is connected to an electrical probe, and the other end is connected to a signal forming circuit, and the signal forming circuit is connected to an oscilloscope; Step 2: The electric probe is attached to the surface of the explosive. In the initial state, the electric probe test circuit is in an open circuit state. In this state, the power supply charges the capacitor; Step 3: The detonation wave reaches the ionization state of the detonation product on the surface of the explosive, the positive and negative electrodes of the electric probe are turned on, the electric probe test circuit is short-circuited, the capacitor begins to discharge, and a voltage pulse signal is generated at both ends of the resistor. The leading edge starting time of the pulse signal is the time when the detonation wave reaches the surface of the explosive; Step 4: The pulse signal is transmitted to the oscilloscope via the cable.

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