Multifunctional non-contact alternating current detection device

Abstract

The utility model relates to a multifunctional non-contact alternating current detection device, which comprises a power supply for supplying power, an electromagnetic sensor for detecting an electric field or a variable magnetic field, a controller electrically connected with the electromagnetic sensor and an amplifying circuit electrically connected with the controller, the switch is used for controlling the power-on or power-off state of the indicator According to the utility model, the electromagnetic sensor, the controller, the amplifying circuit and the indicating lamp circuit are utilized to form the multifunctional non-contact alternating current detection device, the electromagnetic sensor can detect the characteristic of a changing magnetic field at the periphery of a cable with alternating current, and the controller outputs a control signal according to the detection result of the electromagnetic sensor. Corresponding indicator lamps in the indicator lamp circuit are controlled to emit light, so that workers are reminded of cable alternating current, careful construction operation is achieved, and potential safety hazards caused by hot-line work are avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement, and particularly relates to a multifunctional non-contact alternating current detection device. Background Art

[0002] An electric pen is a very commonly used electrician tool, mainly composed of a detection circuit and a detection terminal. When in use, the user needs to contact the detection terminal with the wire to be measured. Therefore, this kind of electrician tool is mainly used for detection at the end of the wire, and it cannot be used for detection at the part with an insulating layer in the middle of the wire.

[0003] In many outdoor electrical operations, what the staff usually come into contact with is the middle part of the cable with alternating current, so a conventional electric pen cannot be used for measurement. When cutting the cable, although the handle of the cable cutter or other cutting tools is sleeved with an insulating sleeve handle, if the cable is charged, there is still a very high risk of electric shock. At present, the method adopted to avoid this risk is for the on-site staff to remotely contact the staff at the switch position, and the staff at the switch position cuts off the power supply of the cable. However, this method may have situations where the staff at the switch position makes an operation error or there is a communication error between the two parties, resulting in a power failure error, cutting off the power supply of the non-operating cable while the operating cable is not powered off.

[0004] To solve the above technical problems, it is necessary to develop a non-contact alternating current detection device, so that the staff can detect whether the operating cable is charged with alternating current to remind the staff and avoid live working. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is: to provide a multifunctional non-contact alternating current detection device to solve the technical problem that a cable with an insulating layer cannot be detected whether it is charged with alternating current at its middle position.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is: a multifunctional non-contact alternating current detection device, including a power supply for power supply, an electromagnetic sensor for detecting an electric field or a changing magnetic field, a controller electrically connected to the electromagnetic sensor, and an amplifier circuit electrically connected to the controller. The amplifier circuit is connected in the indicator light circuit to control the on or off state of the indicator light.

[0007] As a preferred solution, the indicator light circuit includes a red indicator light and a white indicator light connected in parallel at one end of the power supply. The amplifier circuit includes a single-pole double-throw relay and a triode. The common terminal of the single-pole double-throw relay is connected to the other end of the power supply, the normally open contact is connected to the red indicator light in the indicator light circuit, the normally closed contact is connected to the white indicator light in the indicator light circuit, and the coil circuit is connected to the power supply through a triode. The base of the triode is electrically connected to the controller.

[0008] As a preferred solution, the indicator lamp circuit includes a red indicator lamp and a white indicator lamp connected in parallel across the power supply. The amplifying circuit includes two triodes, and the two triodes are serially connected in the circuits of the red indicator lamp and the white indicator lamp respectively, and the bases of the two triodes are electrically connected to the controller.

[0009] As a preferred solution, the controller and the two triodes are connected in parallel and then connected to the power supply through a main switch.

[0010] As a preferred solution, the base of the triode connected to the red indicator lamp is connected to the controller through a resistor and a one-way diode. The one-way diode is located between the controller and the resistor, and the one-way diode conducts unidirectionally towards the resistor. A capacitor is connected in parallel between the one-way diode and the resistor, and the other end of the capacitor is grounded.

[0011] As a preferred solution, the indicator lamp circuit includes a red indicator lamp and a white indicator lamp connected in parallel across the power supply. The amplifying circuit includes two operational amplifiers, and the two operational amplifiers are serially connected in the power supply circuits of the red indicator lamp and the white indicator lamp respectively. The signal input ends of the two operational amplifiers are electrically connected to the controller and are controlled by the controller. The controller is a PLC.

[0012] As a preferred solution, the controller is connected with a soft control switch, and the soft control switch is used to send a wake-up instruction to the controller.

[0013] As a preferred solution, the above non-contact alternating current detection device further includes a housing and a connecting part connected to the housing. The electromagnetic sensor, the controller, the amplifying circuit and the indicator lamp circuit are integrated on a PCB board. The PCB board is fixedly arranged inside the housing. Two lamp holes for embedding the indicator lamps are opened on the housing. The red indicator lamp and the white indicator lamp connected to the PCB board are respectively inserted into one lamp hole. The power supply is arranged inside the housing and is electrically connected to the PCB board to supply power to the PCB board. The connecting part is used to connect other workpieces or tools.

[0014] As a preferred solution, the connecting part includes two symmetrically arranged "S"-shaped elastic pieces. One ends of the two elastic pieces are respectively fixedly connected to the housing. The middle parts of the two elastic pieces are bent in opposite directions to form arc-shaped convex parts. The other ends of the two elastic pieces are separated from each other in a "V" shape. The area where the two arc-shaped convex parts face each other forms a clamping area for clamping rod-shaped workpieces or tools.

[0015] As a preferred solution, the connecting part has magnetism.

[0016] The beneficial effects of the present utility model are as follows: The present utility model uses an electromagnetic sensor, a controller, an amplification circuit, and an indicator light circuit to form a multi-functional non-contact alternating current detection device. Through the electromagnetic sensor, the characteristics of the changing magnetic field around the cable with alternating current can be detected. According to the detection results of the electromagnetic sensor, the controller outputs a control signal to control the corresponding indicator light in the indicator light circuit to emit light, thereby reminding the staff that the cable is with alternating current and to be cautious during construction operations to avoid potential safety hazards caused by live working. At the same time, it also has a lighting function, which can illuminate the working position, improving the safety and accuracy of the operators working in a dark environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further details the specific embodiments of the present utility model in conjunction with the drawings, where:

[0018] Figure 1 is the schematic diagram of Embodiment 1;

[0019] Figure 2 is the circuit diagram of Embodiment 1;

[0020] Figure 3 is the circuit diagram of Embodiment 2;

[0021] Figure 4 is the circuit diagram of Embodiment 3;

[0022] Figure 5 is the overall structure schematic diagram of Embodiment 3;

[0023] Figure 6 is the exploded structure schematic diagram of Embodiment 3;

[0024] Figure 7 is the side elevation view of the overall structure of Embodiment 3;

[0025] Figures 1 to 7 In the figures: 1. Power supply; 2. Electromagnetic sensor; 3. Controller; 4. Amplification circuit; 401. Single-pole double-throw relay; 402. First triode; 403. Second triode; 404. Third triode; 405. Operational amplifier; 5. Indicator light circuit; 501. Red indicator light; 502. White indicator light; 6. Main switch; 7. Resistor; 8. Unidirectional diode; 9. Capacitor; 10. Soft control switch; 11. Outer shell; 12. Connection part; 12a. Protrusion part; 13. PCB board; 14. Lamp hole; 15. Clamping part. SPECIFIC EMBODIMENTS

[0026] The following details the specific implementation schemes of the present utility model in conjunction with the drawings. Embodiment 1

[0027] As Figure 1The multifunctional non-contact alternating current detection device shown includes a power supply 1 for power supply, an electromagnetic sensor 2 for detecting an electric field or a changing magnetic field, a controller 3 electrically connected to the electromagnetic sensor 2, and an amplifier circuit 4 electrically connected to the controller 3. The amplifier circuit 4 is connected in an indicator light circuit 5 to control the energized or de-energized state of the indicator light. The power supply 1 preferably uses a battery.

[0028] As Figure 2 shown, in this embodiment, the indicator light circuit 5 includes a red indicator light 501 and a white indicator light 502 connected in parallel to one end of the power supply. The amplifier circuit 4 includes a single-pole double-throw relay 401 and a first triode 402. The common terminal com of the single-pole double-throw relay 401 is connected to the other end of the power supply, the normally open contact No is connected to the red indicator light 501 in the indicator light circuit 5, the normally closed contact Nc is connected to the white indicator light 502 in the indicator light circuit 5, and the coil W is connected to the power supply through the first triode 402. The base of the first triode 402 is electrically connected to the controller 3, the collector is connected to the power supply, and the emitter is connected to the coil W.

[0029] In practical applications, a resistor 7 can also be connected in series between the first triode 402 and the coil W of the single-pole double-throw relay 401, and a capacitor 9 is connected in parallel between the resistor 7 and the first triode 402. When the first triode 402 is turned on, the power supply 1 charges the capacitor 9. When the magnetic field generated by the alternating current in the cable weakens, it may cause the electromagnetic sensor 2 to fail briefly. At this time, the first triode 402 cannot be turned on, and the capacitor 9 can discharge to maintain the red indicator light 501 emitting light for a period of time, avoiding the red indicator light 501 and the white indicator light 502 from flashing alternately.

[0030] In practical applications, a single-chip microcomputer can be directly purchased and used as the controller 3.

[0031] To reduce the power consumption of the power supply 1, in this embodiment, the controller 3 and the amplifier circuit 4 are further connected in parallel and then connected to the power supply 1 through a main switch 6, so that the loop of the power supply 1 can be completely cut off through the main switch to eliminate the leakage current of the controller 3 and the amplifier circuit 4.

[0032] The working principle of this embodiment is: As Figure 2 shown, before the multifunctional non-contact alternating current detection device is used, the main switch 6 is first closed. At this time, if the electromagnetic sensor 2 does not detect a changing magnetic field, no induced current will be generated, that is, no detection result is output. At this time, the controller 3 does not respond, and the normally closed terminal Nc of the single-pole double-throw relay 401 is conducted with the common terminal com, and the white indicator light 502 is energized and emits light, which can be used for lighting. This state not only prompts the staff that the multifunctional non-contact alternating current detection device is in a working state and there is no cable with alternating current nearby.

[0033] When the multi-functional non-contact AC detection device approaches a cable with alternating current, due to the existence of an alternating magnetic field around the cable, an induced current will be generated in the electromagnetic sensor 2, that is, a detection result is output. At this time, the controller 3 outputs a voltage that makes the triode 402 conduct to the base of the first triode 402. The triode 402 conducts, and the coil W of the single-pole double-throw relay 401 is energized, making the normally open terminal No conduct with the common terminal com, and the red indicator light 501 is energized and emits light. This state prompts the staff that the cable near the multi-functional non-contact AC detection device is with alternating current, and to operate with caution.

[0034] When the multi-functional non-contact AC detection device is not needed, the staff can disconnect the main switch 6 to reduce the power consumption of the power supply 1. Embodiment 2

[0035] As Figure 1 and Figure 3 shown, the multi-functional non-contact AC detection device described in this embodiment also includes a power supply 1 for power supply, an electromagnetic sensor 2 for detecting an electric field or a changing magnetic field, a controller 3 electrically connected to the electromagnetic sensor 2, and an amplifier circuit 4 electrically connected to the controller 3. The amplifier circuit 4 is connected in the indicator light circuit 5 to control the energized or de-energized state of the indicator light. The power supply 1 in this embodiment is preferably a battery, and the controller 3 is preferably a single-chip microcomputer.

[0036] The indicator light circuit 5 in this embodiment also includes a red indicator light 501 and a white indicator light 502 connected in parallel across the power supply, but the amplifier circuit 4 includes a second triode 403 and a third triode 404. The second triode 403 and the third triode 404 are respectively connected in series in the circuits of the red indicator light 501 and the white indicator light 502, and the bases of the second triode 403 and the third triode 404 are electrically connected to the controller 3 respectively. The controller 3 controls the red indicator light 501 and the white indicator light 502 through the second triode 403 and the third triode 404 respectively.

[0037] In order to reduce the standby power consumption, the controller 3, the second triode 403 and the third triode 404 are connected in parallel and then connected to the power supply 1 through a main switch 6.

[0038] In this embodiment, the base of the second triode 403 connected to the red indicator light 501 is connected to the controller 3 through a resistor 7 and a one-way diode 8. The one-way diode 8 is located between the controller 3 and the resistor 7, and the one-way diode 8 conducts unidirectionally towards the resistor 7. A capacitor 9 is connected in parallel between the one-way diode 8 and the resistor 7, and the other end of the capacitor 9 is grounded.

[0039] Similar to Embodiment 1, in this embodiment, the resistor 7 and the capacitor 9 are also provided to avoid the alternating flashing of the red indicator light 501 and the white indicator light 502. The one-way diode 8 is provided to protect the controller 3.

[0040] The working process of this embodiment is as follows: As Figure 3 shown, before the multifunctional non-contact AC detection device is needed, first close the main switch 6. At this time, if the electromagnetic sensor 2 does not detect a changing magnetic field, no induced current will be generated, that is, no detection result is output. At this time, the controller 3 controls the third triode 404 to conduct and the second triode 403 to disconnect, and the white indicator light 502 is powered on and emits light, while the red indicator light 501 does not emit light. This state not only prompts the staff that the multifunctional non-contact AC detection device is in working condition and there is no AC cable nearby.

[0041] When the multifunctional non-contact AC detection device approaches an AC cable, due to the alternating magnetic field around the cable, the electromagnetic sensor 2 will generate an induced current, that is, a detection result is output. At this time, the controller 3 outputs a voltage that makes the triode 403 conduct to the base of the second triode 403. The second triode 403 conducts, and at the same time controls the third triode 404 to disconnect. The red indicator light 501 is powered on and emits light, and the white indicator light 502 loses power and goes out. This state prompts the staff that the cable near the multifunctional non-contact AC detection device is powered by AC, and operate with caution.

[0042] When the multifunctional non-contact AC detection device is not needed, the staff can disconnect the main switch 6 to reduce the power consumption of the power supply 1. Embodiment 3

[0043] As Figure 4 shown, on the basis of Embodiment 2, this embodiment uses two operational amplifiers 405 as the amplifier circuit 4.

[0044] In this embodiment, similar to Embodiment 2, the indicator light circuit 5 includes a red indicator light 501 and a white indicator light 502 connected in parallel across the power supply. The amplifier circuit 4 includes two operational amplifiers 405. The two operational amplifiers 405 are respectively connected in series in the power supply circuits of the red indicator light 501 and the white indicator light 502. The signal input ends of the two operational amplifiers 405 are electrically connected to the controller 3 and are controlled by the controller 3. The controller 3 is a PLC.

[0045] The controller 3 in this embodiment is connected with a soft control switch 10, and the soft control switch 10 is used to send a wake-up instruction to the controller 3. The soft control switch 10 in this embodiment preferably adopts a touch-type induction switch, and in practical applications, an infrared proximity switch or a mechanical tactile switch can also be adopted.

[0046] As Figure 5And Figure 6 As shown in the figure, this embodiment further includes a housing 11 and a connecting portion 12 connected to the housing 11. The electromagnetic sensor 2, the controller 3, the amplifying circuit 4, and the indicator light circuit 5 are integrated on a PCB board 13. The PCB board 13 is fixedly arranged inside the housing 11. Two lamp holes 14 for embedding indicator lights are opened on the housing 11. The red indicator light 501 and the white indicator light 502 connected to the PCB board 13 are respectively inserted into one lamp hole 14. The power supply 1 is arranged inside the housing 11 and is electrically connected to the PCB board 13 to supply power to the PCB board 13. The connecting portion 12 is used to connect other workpieces or tools.

[0047] Since the connection circuits of the electrical components have been shown through circuit diagrams, and the setting of electrical components and circuits on the PCB board belongs to conventional technical means, the layout of the surface of the PCB board 13 will not be elaborated in this embodiment.

[0048] As Figure 7 shown, a main switch 6 is arranged on the housing 11 of this embodiment, and the main switch 6 is a push-button switch.

[0049] As Figure 5 shown, the soft control switch 10 of this embodiment is arranged between the two lamp holes 14 on the top surface of the housing 11. In actual application, the user can change the specific installation position of the soft control switch 10 according to usage habits. It can be connected to the housing 11 by opening a window, or attached to the inner wall of the housing 11 by attaching.

[0050] The connecting portion 12 in this embodiment includes two symmetrically arranged "S"-shaped elastic pieces. One ends of the two elastic pieces are respectively fixedly connected to the housing 11. The middle parts of the two elastic pieces are respectively bent in a separating direction to form arc-shaped convex portions 12a. The other ends of the two elastic pieces are separated from each other in a "V" shape. A clamping area 15 is formed in the area where the two arc-shaped convex portions 12a face each other, for clamping rod-shaped workpieces or tools.

[0051] In actual application, the connecting portion 12 can also have magnetism to adsorb and connect with workpieces or tools by using magnetism.

[0052] Although this embodiment exemplifies two specific forms of the connecting portion 12, those skilled in the art can transform and adopt other forms of conventional connecting portions 12 such as screw thread connection, strap binding connection, hook and buckle connection, etc. according to the inspiration of the present invention, which are all simple replacements for the connecting portion 12 described in the present invention and fall within the protection scope of the present invention.

[0053] The above embodiments merely illustrate the principles and effects of the present invention and some applied embodiments, rather than limiting the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention.

Claims

1. A multifunctional non-contact AC current detection device, characterized in that: The device comprises a power supply (1) for supplying power, an electromagnetic sensor (2) for detecting an electric field or a changing magnetic field, a controller (3) electrically connected to the electromagnetic sensor (2), and an amplifier circuit (4) electrically connected to the controller (3); the amplifier circuit (4) is connected to an indicator light circuit (5) and is used to control the power-on or power-off state of the indicator light.

2. The multifunctional non-contact alternating current detection device according to claim 1, characterized in that: The indicator light circuit (5) comprises a red indicator light (501) and a white indicator light (502) connected in parallel at one end of a power supply, the amplifying circuit (4) comprises a single-pole double-throw relay (401) and a first triode (402), the common terminal of the single-pole double-throw relay (401) being connected to the other end of the power supply, the normally open contact being connected to the red indicator light (501) in the indicator light circuit (5), the normally closed contact being connected to the white indicator light (502) in the indicator light circuit (5), the coil being connected to the power supply via the first triode (402), and the base of the first triode (402) being electrically connected to the controller (3).

3. The multifunctional non-contact alternating current detection device according to claim 1, characterized in that: The indicator light circuit (5) comprises a red indicator light (501) and a white indicator light (502) connected in parallel at both ends of a power supply, and the amplifying circuit (4) comprises a second triode (403) and a third triode (404), the second triode (403) and the third triode (404) being connected in series in a circuit of the red indicator light (501) and the white indicator light (502) in a one-to-one correspondence, and the bases of the second triode (403) and the third triode (404) are respectively electrically connected to the controller (3).

4. The multifunctional non-contact alternating current detection device according to claim 3, characterized in that: The controller (3), the second triode (403) and the third triode (404) are connected in parallel and then connected to the power source (1) via a main switch (6).

5. The multifunctional non-contact alternating current detection device according to claim 3, characterized in that: The base of the second triode (403) connected to the red indicator light (501) is connected to the controller (3) via a resistor (7) and a unidirectional diode (8). The unidirectional diode (8) is located between the controller (3) and the resistor (7). The unidirectional diode (8) conducts in a unidirectional direction toward the resistor (7). A capacitor (9) is connected in parallel between the unidirectional diode (8) and the resistor (7). The other end of the capacitor (9) is grounded.

6. The multifunctional non-contact alternating current detection device according to claim 1, characterized in that: The indicator light circuit (5) comprises a red indicator light (501) and a white indicator light (502) connected in parallel at two ends of a power supply. The amplifying circuit (4) comprises two operational amplifiers (405). The two operational amplifiers (405) are respectively connected in series in the power supply circuits of the red indicator light (501) and the white indicator light (502). The signal input ends of the two operational amplifiers (405) are respectively electrically connected to the controller (3) and are controlled by the controller (3). The controller (3) is a PLC.

7. The multifunctional non-contact alternating current detection device according to any one of claims 1 to 6, characterized in that: The controller (3) is connected to a soft control switch (10), and the soft control switch (10) is used to send a wake-up instruction to the controller (3).

8. The multifunctional non-contact alternating current detection device according to any one of claims 2 to 6, characterized in that: The invention also comprises a housing (11) and a connecting portion (12) connected to the housing (11); the electromagnetic sensor (2), the controller (3), the amplifying circuit (4) and the indicator light circuit (5) are integrated on a PCB board (13); the PCB board (13) is fixedly arranged in the housing (11); two lamp holes (14) for embedding indicator lights are provided in the housing (11); a red indicator light (501) and a white indicator light (502) connected to the PCB board (13) are respectively plugged into one of the lamp holes (14); the power supply (1) is arranged in the housing (11) and is electrically connected to the PCB board (13) to supply power to the PCB board (13); and the connecting portion (12) is used to connect a workpiece or a tool.

9. The multifunctional non-contact alternating current detection device according to claim 8, characterized in that: The connecting portion (12) comprises two symmetrically arranged "S"-shaped spring sheets, one end of each of the two spring sheets being fixedly connected to the housing (11), the middle portions of the two spring sheets being bent in a direction away from each other to form arc-shaped protrusions (12a), the other ends of the two spring sheets being away from each other to form an "eight" shape, and the area opposite to the two arc-shaped protrusions (12a) forming a clamping area (15) for clamping a rod-like workpiece or tool.

10. The multifunctional non-contact alternating current detection device according to claim 8, characterized in that: The connecting portion (12) is magnetic.

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