CN215415594U

CN215415594U - Novel test pencil and measuring circuit

Info

Publication number: CN215415594U
Application number: CN202120663163.3U
Authority: CN
Inventors: 陈伟伟
Original assignee: Irico Hefei LCD Glass Co Ltd
Current assignee: Irico Hefei LCD Glass Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-01-04
Anticipated expiration: 2031-03-31

Abstract

The utility model discloses a novel test pencil and a measuring circuit, and belongs to the technical field of electricians and electronics. The measuring circuit comprises a breakpoint detection circuit and an induction detection circuit which are connected in parallel at two ends of a power supply and are respectively connected with a nib metal conductor through leads. The two detection circuits are respectively and independently provided with a switch, a light-emitting diode, a loudspeaker and an amplifying circuit module, one ends of the two switches are respectively connected with the anode of the power supply, and the other ends of the two switches are respectively connected with the light-emitting diode, the loudspeaker and the amplifying circuit module in series. The test pencil has an integrated circuit board with the measuring circuit in the inner cavity of the casing, one end of the casing is fixedly connected with the pencil point, and the other end is provided with a battery bin. The test pencil has the advantages of simple structure, rapid and accurate detection, convenient and rapid use and the like, can rapidly detect the line breakpoint and induce the electrified condition of the detection circuit, and greatly improves the detection safety.

Description

Novel test pencil and measuring circuit

Technical Field

The utility model belongs to the technical field of electricians and electronics, and particularly relates to a novel test pencil and a measuring circuit.

Background

With the change of the principle of the test pencil in the technical development, the application of the electronic test pencil is more common. The test pencil is used for detecting whether electrified electric power detection instrument of article, and prior art's test pencil is when measuring the electrified condition of wire, often need peel off the insulating skin of wire, can cause certain damage to the wire, and is more troublesome simultaneously, and market needs a test pencil, needs can satisfy multiple survey electric demand, can measure the metal that barely leaks outside, can measure the electrified condition of the intraformational metal of insulating simultaneously, uses in a flexible way, and is safer.

Through retrieval, relevant patents have been published on non-contact induction test pens, for example, the chinese patent application number is: 201910825990.5, filing date: in 2019, 9, 3 months, the name of invention creation is: non-contact induction test pencil. The induction test pencil of the application consists of a 4.5V direct-current power supply, a micro-voltage detection and transistor four-stage composite amplification circuit and an acousto-optic circuit. The micro-voltage detection and transistor four-stage composite amplification circuit consists of an inductive probe L1, 4 NPN transistors VT 1-VT 4 and resistors R1-R3. The acousto-optic circuit is composed of a Light Emitting Diode (LED) and a buzzer HA. The positive pole of the 4.5V direct-current power supply is connected with the positive pole VCC of the circuit, and the negative pole of the 4.5V direct-current power supply is connected with the ground GND of the circuit.

For another example, the chinese patent application No. is: 201420041307.1, filing date: 1, 23 days of 2014, the name of the utility model and creation is as follows: a non-contact test pencil. The test pencil of this application, the base of first triode and the positive pole of protection diode are connected with the signal output part of response piece, first triode, compound amplifier circuit is constituteed to second triode and third triode, the projecting pole of third triode and the first fixed joint of variable resistance are connected, the adjustable joint of variable resistance is connected with the base of fourth triode, the collecting electrode of fourth triode is connected with emitting diode's negative pole, the projecting pole of fourth triode, the second fixed joint of variable resistance and the negative pole of protection diode are connected with the power negative pole, first triode, the collecting electrode of second triode and third triode and emitting diode's positive pole and power positive pole are connected.

The test pencil in the above two applications can work normally without directly contacting with the charged object, and the charged object can be metal, or can be an object or non-metal body with static electricity, and can completely replace the test pencil used by the traditional electrician. However, when the method is used, it is difficult to quickly detect the line break point, and the detection speed and accuracy need to be further improved.

SUMMERY OF THE UTILITY MODEL

1. Problems to be solved

The utility model aims to overcome the defects that when the existing test pencil is used for measuring the electrified condition of a lead, the insulation skin of the lead is often required to be stripped, certain damage can be caused to the lead, and the use is inconvenient, and provides the novel test pencil and the measuring circuit. The test pencil has the advantages of simple structure, rapid and accurate detection, convenience and rapidness in use and the like, can rapidly detect the line breakpoint and sense the electrified condition of the detection circuit, and greatly improves the detection safety.

2. Technical scheme

In order to solve the problems, the technical scheme adopted by the utility model is as follows:

the measuring circuit of the novel test pencil comprises a breakpoint detection circuit and an induction detection circuit, wherein the breakpoint detection circuit and the induction detection circuit are connected in parallel at two ends of a power supply E and are respectively connected with a nib metal conductor through leads; the breakpoint detection circuit and the induction detection circuit are respectively and independently provided with a switch ST, a light emitting diode D, a loudspeaker and an amplifying circuit module, one ends of the two switches ST are respectively connected with the anode of a power supply E, and the other ends of the two switches ST are respectively connected with the light emitting diode D, the loudspeaker and the amplifying circuit module in series.

Furthermore, an amplifying circuit module arranged in the breakpoint detection circuit comprises a field effect transistor V1, a transistor V2 and a transistor V3, wherein the grid electrode of the field effect transistor V1 is connected with the pen point metal conductor through a resistor R1, and the source electrode of the field effect transistor V1 is connected with the base electrode of the transistor V2 on one hand and the switch ST1 through a resistor R2 on the other hand; the collector of the transistor V2 is connected with the base of the transistor V3 through a resistor R4 on one hand and is connected with the switch ST1 through a resistor R3 on the other hand; the collector of the transistor V3 is connected with the loudspeaker A and the LED D1; the drain of the field effect transistor V1, the collector of the transistor V2 and the collector of the transistor V3 are all grounded.

Furthermore, an amplifying circuit module arranged in the induction detection circuit comprises 6 inverters, a diode D3, a capacitor and a resistor, wherein a No. 1 terminal on an inverter IC1-1 is grounded through a resistor R5 and a capacitor C2 in sequence on one hand, and is connected with the anode of a power supply E through a switch ST2 on the other hand; the No. 2 terminal on the inverter IC1-1 is connected with the No. 3 terminal on the inverter IC1-2 on one hand, and is grounded through a resistor R7 on the other hand; the No. 4 terminal of the inverter IC1-2 is respectively connected with the No. 5 terminal of the inverter IC1-3 and the No. 9 terminal of the inverter IC 1-4; the No. 6 terminal on the inverter IC1-3 is connected with the buzzer HTD and the light-emitting diode D2 sequentially through the diode D3, the inverter IC1-5 and the inverter IC 1-6; the cathode of the led D2 is connected to the terminal No. 8 of the inverter IC1-4 through a transistor V4.

Furthermore, the model of the field effect transistor V1 is 3GJ6, and the model of the transistor V2 and the model of the transistor V3 are 9013.

Furthermore, the No. 13 terminal on the inverter IC1-5 is connected with the No. 12 terminal on the inverter IC1-6 through a resistor R9 and a capacitor C3; no. 12 terminal on the inverter IC1-5 is connected with No. 12 terminal on the inverter IC1-6 through a resistor R10 and a capacitor C3.

Furthermore, the models of the 6 inverters are CD4069, and the model of the transistor V4 is 9013.

The novel test pencil comprises an integrated circuit board with the measuring circuit, an insulating shell, a pencil point, a buzzer, a light-emitting light source and a detection button, wherein one end of the insulating shell is fixedly connected with the pencil point, and the other end of the insulating shell is provided with a battery bin; the buzzer is a loudspeaker A and a buzzer HTD, and the light-emitting light sources are a light-emitting diode D1 and a light-emitting diode D2; the integrated circuit board is arranged in the inner cavity of the insulating shell, and the detection button is arranged on the surface of the insulating shell and is abutted against a switch ST on the internal integrated circuit board.

Furthermore, the detection button comprises a breakpoint detection button and an induction detection button, and the breakpoint detection button is abutted against a switch ST1 on the integrated circuit board; the induction detection button is abutted against a switch ST2 on the integrated circuit board; button cells are placed in the cell bins and are connected with the integrated circuit board through wires.

Furthermore, an insulating sleeve is further arranged at the fixedly connected position of the pen point and one end of the insulating shell, and the insulating shell is made of plastic with the withstand voltage value of at least 500V.

Furthermore, a rectangular light-emitting window is arranged at the position of the light-emitting source on the insulating shell, and the shell at the position of the light-emitting window is made of transparent plastic; a round buzzer hole is processed at the buzzer mounting position on the insulating shell.

3. Advantageous effects

Compared with the prior art, the utility model has the beneficial effects that:

(1) the measuring circuit of the novel test pencil comprises a breakpoint detection circuit and an induction detection circuit, wherein the breakpoint detection circuit and the induction detection circuit are connected in parallel at two ends of a power supply E and are connected with a pencil point through leads. Simultaneously, all be equipped with switch ST, emitting diode D, speaker and amplifier circuit module on breakpoint detection circuit and the response detection circuit, through carrying out optimal design to measuring circuit's structure, when detecting the electrified condition of circuit, can realize the breakpoint detection function on the one hand, on the other hand can also be through the inside and outside metal electrified condition of induction measurement insulating layer, need not peel off the insulating skin of wire and detect, detect rapidly, convenient, and do not harm the wire.

(2) According to the novel measuring circuit of the test pencil, the breakpoint detection circuit and the amplifying circuit module of the induction detection circuit are optimally designed, particularly, 1 field effect transistor and 2 transistor are used in the breakpoint detection circuit, 6 inverters and 1 transistor are used in the induction detection circuit, and the specific types of the field effect transistor, the transistor and the inverter are optimized, so that two detection functions of the measuring circuit can be effectively guaranteed, and the stability and the accuracy of detection are high.

(3) According to the novel test pencil, the detection circuit is integrated on the integrated circuit board and is installed in the insulating shell of the test pencil, the shell is correspondingly provided with the breakpoint detection button and the induction detection button which respectively abut against the switch ST1 and the switch ST2 on the measurement circuit, and when measurement is carried out, two detection functions are realized by pressing the corresponding buttons. In addition, the position where the pen point is fixedly connected with the insulating shell is also provided with an insulating sleeve, so that the safety during detection is further improved.

Drawings

FIG. 1 is a schematic diagram of the circuit connection of the test integrated circuit board of the test pencil of the present invention;

fig. 2 is a schematic view of the entire structure of the test pencil of the present invention.

In the figure:

1. a pen point; 2. an insulating sleeve; 3. an insulating housing; 4. a buzzer; 5. a light emitting source; 6. a breakpoint detection button; 7. sensing a detection button; 8. and a battery compartment.

Detailed Description

The utility model is further described with reference to specific examples.

Example 1

As shown in fig. 1, the measuring circuit of the novel test pencil of the present embodiment includes a breakpoint detecting circuit and an induction detecting circuit, both of which are connected in parallel to both ends of a power supply E and are connected to a nib metal conductor through wires, respectively; the breakpoint detection circuit and the induction detection circuit are respectively and independently provided with a switch ST, a light emitting diode D, a loudspeaker and an amplifying circuit module, one ends of the two switches ST are respectively connected with the anode of a power supply E, and the other ends of the two switches ST are respectively connected with the light emitting diode D, the loudspeaker and the amplifying circuit module in series. According to the utility model, through optimally designing the structure of the measuring circuit, when the electrified condition of the line is detected, on one hand, the breakpoint of the line can be detected, on the other hand, whether metal and bare metal in the insulating layer are electrified can be sensed and measured, and the insulating skin of the conducting wire does not need to be stripped for detection.

Specifically, in the present invention, the amplifying circuit module disposed in the breakpoint detection circuit includes a field effect transistor V1, a transistor V2, and a transistor V3, wherein the type of the field effect transistor V1 is 3GJ6, a gate of the field effect transistor V1 is connected to the pen tip metal conductor through a resistor R1, and a source of the field effect transistor V1 is connected to a base of the transistor V2 on one hand, and is connected to a switch ST1 through a resistor R2 on the other hand. The model of the transistor V2 is 9013, and the collector of the transistor V2 is connected with the base of the transistor V3 through a resistor R4 on one hand, and is connected with a switch ST1 through a resistor R3 on the other hand. The transistor V3, also model 9013, has its collector connected to speaker a and led D1. Meanwhile, the drain of the field effect transistor V1, the emitter of the transistor V2 and the emitter of the transistor V3 are all grounded.

The amplifying circuit module arranged in the induction detection circuit comprises 6 inverters, a diode D3, a capacitor and a resistor, wherein the model of the 6 inverters is CD4069, and a No. 1 terminal on an inverter IC1-1 is grounded through a resistor R5 and a capacitor C2 in sequence on one hand, and is connected with the anode of a power supply E through a switch ST2 on the other hand; the No. 2 terminal on the inverter IC1-1 is connected with the No. 3 terminal on the inverter IC1-2 on one hand, and is grounded through a resistor R7 on the other hand; the No. 4 terminal of the inverter IC1-2 is respectively connected with the No. 5 terminal of the inverter IC1-3 and the No. 9 terminal of the inverter IC 1-4; the No. 6 terminal on the inverter IC1-3 is connected with the buzzer HTD and the light-emitting diode D2 sequentially through the diode D3, the inverter IC1-5 and the inverter IC 1-6; the cathode of the led D2 is connected to the terminal No. 8 of the inverter IC1-4 through a transistor V4. In addition, the No. 13 terminal on the inverter IC1-5 is connected with the No. 12 terminal on the inverter IC1-6 through a resistor R9 and a capacitor C3; no. 12 terminal on the inverter IC1-5 is connected with No. 12 terminal on the inverter IC1-6 through a resistor R10 and a capacitor C3. The utility model realizes the breakpoint detection function by using 1 field effect transistor and 2 transistor, realizes the induction measurement of the metal electrification conditions inside and outside the insulating layer by using 6 inverters and 1 transistor, and optimizes the specific types of the field effect transistor, the transistor and the inverter, thereby effectively ensuring two detection functions of the measuring circuit, and having higher detection stability and accuracy, simple circuit structure and lower manufacturing cost.

The specification of the device such as the resistor and the capacitor related to the present invention is specifically R1: 150K omega; r2, R3: 10K omega; r4: 330 Ω; r5, R6: 820K omega; r7: 4.7K Ω; r8: 270 omega; r9: 560K Ω; r10: 270K omega; v1: 3GJ 6; V2-V4: 9013; c1, C2: 1F; c3: 270 μ F. When the device is used, the specification of each component can be determined according to actual requirements. When the circuit breaking point detection is carried out by adopting the measuring circuit, the switch ST1 needs to be closed, when the pen point 1 of the test pencil passes along the route of the circuit, the field effect transistor V1 and the crystal triodes V2 and V3 are arranged on the integrated circuit board, the electromagnetic induction signal is amplified by the amplifying circuit consisting of V1, V2, V3, R2, R3 and R4, the light emitting diode D1 emits light, and the normal circuit display screen of the electric wire displays normal network. When the test pencil probe crosses the disconnection part, because there is no corresponding voltage or current, the light emitting diode D1 changes from the light emitting state to the non-light emitting state, the wire disconnection display screen displays abnormal network wire display, and the buzzer A sounds, and the disconnection part is the disconnection part. Similarly, if the light is changed from the non-light-emitting state to the light-emitting state, it can be determined that the light is disconnected.

When the switch ST2 is closed to make the pen point 1 approach or contact the charged body, the inverter IC1-1 and the surrounding elements mounted on the integrated circuit board constitute a high input impedance and high gain voltage amplifier. After receiving the weak electric field signal, the pen point 1 amplifies and outputs the signal through the amplifier, and shapes the signal through the inverter ICl-2 to control a post-stage circuit. The inverter ICl-5, the IC1-6, the resistors R9 and R10 and the capacitor C3 form a multivibrator, the operation of which is controlled by the operating state of the inverter ICl-3. When the pen point 1 detects a signal, ICl-3 outputs a high level, the diode D3 is cut off, the oscillator works, and the buzzer HTD is pushed to sound. Meanwhile, the inverter ICl-4 outputs high level, the triode V4 is conducted, and the red light emitting diode D2 is lightened to indicate that the tested lead is electrified. When the line is not charged, there is no output.

Example 2

As shown in fig. 1 and fig. 2, the main structure of the novel test pencil of the present embodiment is basically the same as that of embodiment 1, and the main differences are as follows: and integrating the measuring circuit on an integrated circuit board and mounting the measuring circuit on the test pencil. The test pencil further comprises an insulating shell 3, a pen point 1, a buzzer 4, a light-emitting source 5 and a detection button. The insulating shell 3 is made of plastic with a withstand voltage value of at least 500V, one end of the insulating shell is fixedly connected with the pen point 1, the other end of the insulating shell is provided with a battery bin 8, 2 button batteries with 1.5V in series connection can be installed in the battery bin 8, and the battery bin is connected with the integrated circuit board through a lead to supply power to the integrated circuit board.

The pen point 1 of the test pencil can be in a straight spiral knife type. An integrated circuit board is arranged in the inner cavity of the shell of the insulating shell 3, and a round buzzer hole is formed in the surface of the middle part of the shell at the position of the buzzer 4, so that sound is conveniently transmitted; a rectangular light-emitting window is arranged at the light-emitting source 5, and the shell part at the light-emitting window is made of transparent plastics, so that light can conveniently penetrate out and can be easily perceived by human eyes; a detection button is arranged at a switch ST on the integrated circuit board, and the breakpoint detection button 6 is abutted against a switch ST1 on the integrated circuit board; the induction detection button 7 is abutted with a switch ST2 on the integrated circuit board. The buzzer 4 is a loudspeaker A and a buzzer HTD which are arranged on the integrated circuit board, the light-emitting light source 5 is a light-emitting diode D1 and a light-emitting diode D2 which are arranged on the integrated circuit board, and when the conducting wire is measured, the corresponding button is pressed, the power supply is switched on, and two detection functions can be realized. The test pencil has the advantages of simple structure, reasonable design, flexible application and safer use. In addition, nib 1 still is equipped with insulation support 2 with 3 links firmly departments of insulating casing to security when further having improved the detection.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the utility model, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the utility model.

Claims

1. The utility model provides a measuring circuit of novel test pencil which characterized in that: the device comprises a breakpoint detection circuit and an induction detection circuit, wherein the breakpoint detection circuit and the induction detection circuit are connected in parallel at two ends of a power supply E and are respectively connected with a nib metal conductor through wires; the breakpoint detection circuit and the induction detection circuit are respectively and independently provided with a switch ST, a light emitting diode D, a loudspeaker and an amplifying circuit module, one ends of the two switches ST are respectively connected with the anode of a power supply E, and the other ends of the two switches ST are respectively connected with the light emitting diode D, the loudspeaker and the amplifying circuit module in series.

2. The measuring circuit of the novel test pencil according to claim 1, characterized in that: an amplifying circuit module arranged in the breakpoint detection circuit comprises a field effect transistor V1, a transistor V2 and a transistor V3, wherein the grid electrode of the field effect transistor V1 is connected with a pen point metal conductor through a resistor R1, and the source electrode of the field effect transistor V1 is connected with the base electrode of a transistor V2 on one hand and is connected with a switch ST1 through a resistor R2 on the other hand; the collector of the transistor V2 is connected with the base of the transistor V3 through a resistor R4 on one hand and is connected with the switch ST1 through a resistor R3 on the other hand; the collector of the transistor V3 is connected with the loudspeaker A and the LED D1; the drain of the field effect transistor V1, the collector of the transistor V2 and the collector of the transistor V3 are all grounded.

3. The measuring circuit of the novel test pencil according to claim 1, characterized in that: an amplifying circuit module arranged in the induction detection circuit comprises 6 inverters, a diode D3, a capacitor and a resistor, wherein a No. 1 terminal on an inverter IC1-1 is grounded through a resistor R5 and a capacitor C2 in sequence on one hand, and is connected with the anode of a power supply E through a switch ST2 on the other hand; the No. 2 terminal on the inverter IC1-1 is connected with the No. 3 terminal on the inverter IC1-2 on one hand, and is grounded through a resistor R7 on the other hand; the No. 4 terminal of the inverter IC1-2 is respectively connected with the No. 5 terminal of the inverter IC1-3 and the No. 9 terminal of the inverter IC 1-4; the No. 6 terminal on the inverter IC1-3 is connected with the buzzer HTD and the light-emitting diode D2 sequentially through the diode D3, the inverter IC1-5 and the inverter IC 1-6; the cathode of the led D2 is connected to the terminal No. 8 of the inverter IC1-4 through a transistor V4.

4. The measuring circuit of the novel test pencil according to claim 2, characterized in that: the model of the field effect transistor V1 is 3GJ6, and the model of the transistor V2 and the model of the transistor V3 are 9013.

5. The measuring circuit of the novel test pencil according to claim 3, characterized in that: the No. 13 terminal on the inverter IC1-5 is connected with the No. 12 terminal on the inverter IC1-6 through a resistor R9 and a capacitor C3; no. 12 terminal on the inverter IC1-5 is connected with No. 12 terminal on the inverter IC1-6 through a resistor R10 and a capacitor C3.

6. The measuring circuit of the novel test pencil according to claim 5, characterized in that: the models of the 6 inverters are CD4069, and the model of the transistor V4 is 9013.

7. A novel test pencil is characterized in that: comprising an integrated circuit board with a measuring circuit according to any of the claims 1-6, an insulating housing (3), a pen tip (1), a buzzer (4), a light emitting source (5), and a detection button, wherein one end of the insulating housing (3) is fixedly connected with the pen tip (1), and the other end thereof is provided with a battery compartment (8); the buzzer (4) is a loudspeaker A and a buzzer HTD, and the light-emitting light source (5) is a light-emitting diode D1 and a light-emitting diode D2; the integrated circuit board is arranged in an inner cavity of the shell of the insulating shell (3), and the detection button is arranged on the surface of the shell of the insulating shell (3) and is abutted against a switch ST on the internal integrated circuit board.

8. The novel test pencil of claim 7, wherein: the detection button comprises a breakpoint detection button (6) and an induction detection button (7), and the breakpoint detection button (6) is abutted to a switch ST1 on the integrated circuit board; the induction detection button (7) is abutted against a switch ST2 on the integrated circuit board; button cells are placed in the cell bin (8) and connected with the integrated circuit board through wires.

9. The novel test pencil of claim 8, wherein: the pen point (1) is fixedly connected with one end of the shell of the insulating shell (3) through an insulating sleeve (2), and the insulating shell (3) is made of plastic with a voltage withstanding value of at least 500V.

10. The novel test pencil of claim 9, wherein: a rectangular light-emitting window is arranged on the insulating shell (3) at the position of the light-emitting source (5), and a shell at the position of the light-emitting window is made of transparent plastic; a round buzzer hole is processed at the mounting position of the buzzer (4) on the insulating shell (3).