CN215678533U

CN215678533U - Clamp type ammeter

Info

Publication number: CN215678533U
Application number: CN202122236715.5U
Authority: CN
Inventors: 陈群
Original assignee: Zhejiang Intercity Special Equipment Testing Co ltd
Current assignee: Zhejiang Intercity Special Equipment Testing Co ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-01-28
Anticipated expiration: 2031-09-15

Abstract

The application relates to a clamp-on ammeter, which comprises a meter body, wherein a movable wrench is arranged on the meter body, a first infrared distance measuring sensor and a second infrared distance measuring sensor which face the center of the movable wrench are arranged on the meter body, the first infrared distance measuring sensor comprises a first transmitting tube and a first receiving tube, the second infrared distance measuring sensor comprises a second transmitting tube and a second receiving tube, the first receiving tube and the second receiving tube are both connected with a control circuit, the output end of the control circuit is connected with a prompting device, the prompting device is arranged on the meter body, when the intensity of the signal received by the first receiving tube is greater than the preset intensity, the first receiving tube sends out a first electrifying signal, when the intensity of the signal received by the second receiving tube is greater than the preset intensity, the second receiving tube sends out a second electrifying signal, when the control circuit receives the first electrifying signal and the second electrifying signal at the same time, the prompting device sends out a prompting signal. This application has the effect that the data that makes the staff measure is the data when the wire is in adjustable spanner central authorities.

Description

Clamp type ammeter

Technical Field

The application relates to the technical field of measuring equipment, in particular to a clamp-on ammeter.

Background

A clamp-on ammeter, also called a card meter, is a portable meter capable of measuring current without cutting off a circuit, and is generally mainly used for current measurement of a low-voltage system.

In the related art, a patent document with publication number CN209043968U discloses a clamp-type ammeter, which includes an ammeter case, a movable wrench rotatably connected to one side of the top end of the ammeter case, and an elastic member for resetting the movable wrench after rotation; the inside of ammeter casing is provided with the cavity, and the elastic component sets up in the cavity, and the spout has been seted up on its adjustable spanner's top, and sliding connection has the compensation piece that stretches out the spout in the spout, still is provided with on the adjustable spanner to carry out the fixed mounting to the compensation piece after sliding.

For the related technologies, the inventor thinks that in the process of measuring the clamp ammeter, a worker cannot know whether a measured lead is located in the center of the adjustable wrench, and the measured data may have a certain error.

SUMMERY OF THE UTILITY MODEL

In order to enable data read by a worker to be data when a lead to be measured is located in the center of an adjustable wrench, the application provides the clamp-type ammeter.

The application provides a clamp-on ammeter adopts following technical scheme:

a clamp type ammeter comprises a meter body, wherein a movable wrench in a clamp shape is arranged on the meter body, a first infrared distance measuring sensor and a second infrared distance measuring sensor are arranged on the end face, facing the middle of the movable wrench, of the meter body, the first infrared distance measuring sensor and the second infrared distance measuring sensor face the center of the movable wrench, the first infrared distance measuring sensor comprises a first transmitting tube and a first receiving tube, the second infrared distance measuring sensor comprises a second transmitting tube and a second receiving tube, the first receiving tube and the second receiving tube are both connected with a control circuit, the output end of the control circuit is connected with a prompting device, the prompting device is arranged on the meter body, when the first receiving tube receives a first infrared signal sent by the first transmitting tube, if the intensity of the first infrared signal is greater than preset intensity, the first receiving tube sends a first electrifying signal, when the second receiving tube receives a second infrared signal sent by the second transmitting tube, if the intensity of the second infrared signal is greater than the preset intensity, the second receiving tube sends a second electrifying signal, and when the control circuit receives the first electrifying signal and the second electrifying signal simultaneously, the prompting device sends a prompting signal.

By adopting the technical scheme, in the using process of the clamp-on ammeter, the wire is positioned in the middle of the clamp-on monkey wrench, the first receiving tube receives the first infrared signal sent back by the first transmitting tube all the time, when the voltage value of the first infrared signal is greater than the preset voltage intensity, the fact that the wire blocks the first infrared signal sent by the first transmitting tube is proved, the distance between the wire and the first receiving tube is smaller than or equal to the distance between the centre of the monkey wrench and the first receiving tube at the moment, and the first receiving tube outputs the first electrifying signal to the control circuit. The second receiving tube receives a second infrared signal which is sent back by the second sending tube after being sent out constantly, when the voltage value of the second infrared signal is larger than the preset voltage intensity, the fact that the second infrared signal sent by the second sending tube is shielded by the conducting wire is proved, at the moment, the distance between the conducting wire and the second receiving tube is smaller than or equal to the distance between the center of the adjustable wrench and the second receiving tube, and the second receiving tube outputs a second electrifying signal to the control circuit. When the control circuit receives the first electrifying signal and the second electrifying signal simultaneously, the wire is proved to be in the center of the adjustable wrench, the prompting device sends out a prompting signal at the moment, and a worker can read the wire.

Optionally, the control circuit includes:

the judging unit is connected with the first receiving tube and the second receiving tube and used for receiving the first electrifying signal and the second electrifying signal and outputting a driving signal when receiving the first electrifying signal and the second electrifying signal simultaneously;

the driving unit is connected with the judging unit and used for receiving the driving signal, and outputting a control signal to control a circuit path of the unit where the prompting device is located when the driving signal is received;

and the control unit is connected with the driving unit and used for receiving the control signal, and when the control signal is received, the prompting device is electrified to send out a prompting signal.

By adopting the technical scheme, when the judging unit receives the first electrifying signal and the second electrifying signal simultaneously, the fact that the conducting wire is located in the center of the adjustable wrench is indicated, the driving signal is output, the driving signal is received by the driving unit, the driving unit outputs the control signal to the control unit, the control unit is conducted to enable the prompting device to be electrified to send out the prompting signal, and a worker reads the prompting signal after obtaining the prompting signal.

Optionally, the determining unit includes:

and the AND gate is provided with a first input end, a second input end and an output end, wherein the first input end is connected with the output end of the first receiving tube, the second input end is connected with the output end of the second receiving tube, and the output end outputs a driving signal.

By adopting the technical scheme, if the first input end receives the first electrifying signal, the strength of the first infrared signal transmitted back is larger than the preset strength, so that the condition that the wire shields the first infrared signal and the distance from the wire to the first receiving tube is smaller than or equal to the distance from the center of the adjustable wrench to the first receiving tube is explained. If the second input end receives the second electrifying signal, the strength of the transmitted second infrared signal is larger than the preset strength, so that the lead shields the second infrared signal and the distance from the lead to the second receiving pipe is smaller than or equal to the distance from the center of the adjustable wrench to the second receiving pipe. When the output end outputs the driving signal, the first electrifying signal and the second electrifying signal are proved to be received simultaneously, and then the lead is shown to be in the center of the adjustable wrench.

Optionally, the driving unit includes:

an NPN triode, the base of which is connected with the output end of the AND gate, the emitter of which is grounded through a first resistor, a first direct current is connected with a relay and a collector in series, and the relay outputs a control signal;

and the protection circuit is connected with the relay in parallel.

By adopting the technical scheme, after the AND gate outputs the driving signal, the NPN triode is conducted to enable the relay to be electrified, and the relay outputs the control signal. The arrangement of the protection circuit prevents the relay from being damaged due to the fact that reverse breakdown voltage of the NPN triode is too large, and normal use of the relay is protected.

Optionally, the control unit includes:

and the normally open switch is connected with the relay, one end of the normally open switch is grounded through the second resistor, and the second direct current series prompting device is connected with the other end of the normally open switch.

Through adopting above-mentioned technical scheme, when the relay does not receive the electricity, normally open switch is in the off-state all the time, and suggestion device does not receive the electricity this moment, explains that the wire is not in monkey wrench's central authorities. When the relay is electrified, the indication wire is positioned in the center of the adjustable wrench, the normally open switch is closed, the circuit where the prompting device is positioned is conducted, and the prompting device is electrified to send a prompting signal to remind a worker to read data.

Optionally, a rotating shaft is arranged in the meter body, one end, far away from the meter body, of the rotating shaft is connected with an adjusting knob in a sliding mode, a first sawtooth part is arranged on the side wall of the adjusting knob in the circumferential direction, and a second sawtooth part matched with the first sawtooth part is arranged on the meter body.

Through adopting above-mentioned technical scheme, when adjust knob is in with the laminating of table body terminal surface, the first sawtooth part of adjust knob lateral wall and the two sawtooth parts joint on the table body, adjust knob can't rotate, avoids the rotatory knob of measuring in-process, causes the insulating condition of secondary short circuit breakdown. When the rotating shaft needs to be rotated to adjust the measuring range, the axis moves the adjusting knob upwards to enable the clamping matching of the first sawtooth part and the second sawtooth part to be cancelled, and then the rotating shaft is rotated.

Optionally, the adjusting knob is axially provided with a rib, and the rotating shaft is provided with a sliding groove for the rib to slide.

Through adopting above-mentioned technical scheme, when the staff applyed the revolving force to adjust knob, adjust knob can drive the axis of rotation and rotate to satisfy adjust knob and axis of rotation synchronous revolution.

Optionally, a limiting block is arranged at the end part of one end, far away from the watch body, of the rotating shaft.

Through adopting above-mentioned technical scheme, avoid the staff to remove adjust knob to the in-process of keeping away from the table body, the condition that adjust knob breaks away from the axis of rotation appears to avoid the unable circumstances of aiming at of range to take place.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the working personnel can judge whether the lead to be tested is positioned in the center of the adjustable wrench or not by judging whether the prompting device sends a prompting signal or not so as to ensure that the data read by the working personnel are the data when the lead is positioned in the center of the adjustable wrench and ensure the accuracy of the data;

2. when the arrangement of the first sawtooth part and the second sawtooth part enables the adjusting knob to be attached to the end face of the surface body, the adjusting knob cannot rotate, and secondary short circuit breakdown insulation caused by adjusting the measuring range in the measuring process is avoided.

Drawings

FIG. 1 is a schematic structural diagram of a current clamp meter according to an embodiment of the present application;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is a schematic structural diagram of a first infrared ranging sensor and a second infrared ranging sensor according to an embodiment of the present application;

fig. 4 is a circuit diagram of a control circuit according to an embodiment of the present application.

Description of reference numerals: 1. a watch body; 2. an adjustable wrench; 3. a first emitter tube; 4. a first receiving pipe; 5. a second launch tube; 6. a second receiving pipe; 7. a prompting device; 8. a rotating shaft; 9. adjusting a knob; 10. a first serration; 11. a second serration; 12. a rib; 13. a sliding groove; 14. a limiting block; 15. a judgment unit; 16. a drive unit; 17. a control unit.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses a clamp-on ammeter. Referring to fig. 1 and 2, the clamp-on ammeter comprises a meter body 1, wherein a clamp-on adjustable wrench 2 is arranged on the meter body 1, and the adjustable wrench 2 is made of iron. The table body 1 is gone to the terminal surface in the middle of 2 monkey wrenches of orientation and is inlayed and be equipped with first infrared ranging sensor and second infrared ranging sensor, and first infrared ranging sensor and second infrared ranging sensor all face monkey wrench 2's central authorities. A rotating shaft 8 for adjusting the measuring range is rotatably connected to the watch body 1, the rotating shaft 8 penetrates through the operation end face of the watch body 1, the rotating shaft 8 is cylindrical, and the axis of the rotating shaft 8 is perpendicular to the operation end face of the watch body 1. The rotating shaft 8 is connected with an adjusting knob 9 in a sliding mode, the adjusting knob 9 is in a circular column shape, and the inner wall of the adjusting knob 9 is closely attached to the side wall of the rotating shaft 8. The adjusting knob 9 is provided with an indicating needle which is used for corresponding to the range on the watch body 1, so that the staff can know the used range. The inside of adjust knob 9 has many beads 12 along axial circumference interval welding, offers the groove 13 that slides that supplies bead 12 to slide on the axis of rotation 8, and the groove 13 that slides runs through the one end tip that the table body 1 was kept away from to axis of rotation 8. When the adjustment knob 9 is rotated, the ribs 12 apply a rotational force to the rotation shaft 8 so that the rotation shaft 8 can be rotated in accordance with the rotation of the adjustment knob 9. A limiting block 14 is welded at the end part, far away from the watch body 1, of the rotating shaft 8, and the limiting block 14 is cylindrical and is arranged coaxially with the rotating shaft 8. The cross section area of the limiting block 14 is larger than that of the rotating shaft 8, and the adjusting knob 9 cannot fall out of the rotating shaft 8 due to the arrangement of the limiting block 14.

The welding of the lateral wall circumference of adjust knob 9 has first sawtooth portion 10, and the welding of the operation terminal surface of the table body 1 has the second sawtooth portion 11 with can with a section first sawtooth portion 10 joint, and when adjust knob 9 and the operation terminal surface laminating of the table body 1, first sawtooth portion 10 and 11 joints of second sawtooth portion make adjust knob 9 unable rotation. When the range needs to be adjusted, the adjusting knob 9 is moved to enable the adjusting knob 9 to axially move on the rotating shaft 8, at the moment, the clamping fit between the first sawtooth part 10 and the second sawtooth part 11 is cancelled, the adjusting knob 9 is rotated to enable the pointer on the adjusting knob 9 to rotate to the required range, and at the moment, the rotating shaft 8 rotates to the corresponding range along with the rotation of the adjusting knob 9. The operation end face of the watch body 1 is provided with a prompting device 7, the prompting device 7 can be a lamp or a loudspeaker, and the prompting device 7 is electrically connected with an internal circuit of the watch body 1.

Referring to fig. 3, the first infrared distance measuring sensor includes a first transmitting tube 3 and a first receiving tube 4, and the second infrared distance measuring sensor includes a second transmitting tube 5 and a second receiving tube 6, and the first transmitting tube 3, the first receiving tube 4, the second transmitting tube 5, and the second receiving tube 6 are all directed toward the center of the adjustable wrench 2 (see fig. 1). When the lead is positioned in the center of the adjustable wrench 2, the first receiving tube 4 and the second receiving tube 6 can simultaneously receive the infrared rays emitted back. The first receiving tube 4 and the second receiving tube 6 are both connected in a control circuit, and the output end of the control circuit is connected with a prompting device 7 (see fig. 1).

Referring to fig. 4, the control circuit includes: a judging unit 15 connected to the first receiving tube 4 and the second receiving tube 6, for receiving the first energizing signal and the second energizing signal, and outputting a driving signal when receiving the first energizing signal and the second energizing signal at the same time; the driving unit 16 is connected with the judging unit 15 and used for receiving the driving signal, and when the driving signal is received, a control signal is output to control the circuit path of the unit where the prompting device 7 is located; and the control unit 17 is connected with the driving unit 16 and used for receiving the control signal, and when the control signal is received, the prompting device 7 is powered on to send out a prompting signal. The judgment unit 15 includes: AND the AND gate AND is provided with a first input end, a second input end AND an output end, wherein the first input end is connected with the output end of the first receiving tube 4, the second input end is connected with the output end of the second receiving tube 6, AND the output end outputs a driving signal. The drive unit 16 includes: an NPN triode Q, the base level of which is connected with the output end of the AND gate AND, the emitter of which is grounded through a first resistor R1, a first direct current V1 is connected with a relay KM AND a collector in series, AND the relay KM outputs a control signal; and the protection circuit comprises a diode D which is connected with the relay KM in parallel, the anode of the diode D is connected with the collector, and the cathode of the diode D is connected with the first direct current V1. The control unit 17 includes: and the normally open switch SA is connected with the relay KM, one end of the normally open switch SA is grounded through a second resistor R2, and a second direct current V2 series prompting device 7 is connected with the other end of the normally open switch SA.

The control circuit of the embodiment of the application has the technical effects that: the AND gate AND is used for receiving the first electrifying signal AND the second electrifying signal, if the AND gate AND receives the first electrifying signal AND the second electrifying signal at the same time, the output end of the AND gate AND outputs a high-level driving signal, the NPN triode Q is conducted by the high-level driving signal, a relay KM connected with the collector electrode of the NPN triode Q in series is electrified, the relay KM controls the normally open switch SA to be closed, a circuit where the normally open switch SA is located is conducted, AND a prompting device 7 located on the circuit conducts electricity to send a prompting signal.

The implementation principle of the clamp-on ammeter in the embodiment of the application is as follows: the adjusting knob 9 is moved to separate the first sawtooth part 10 from the second sawtooth part 11, the adjusting knob 9 is rotated to a required range, and then the adjusting knob 9 is moved to clamp the first sawtooth part 10 and the second sawtooth part 11, so that the adjusting knob 9 is fixed. The wire to be tested is placed in the adjustable wrench 2, when the prompting device 7 sends out a prompting signal, the wire to be tested is shown to be in the center of the adjustable wrench 2, and at the moment, the worker reads the wire.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A clamp-on ammeter, its characterized in that: the infrared distance measuring instrument comprises an instrument body (1), wherein a monkey wrench (2) in a jaw shape is arranged on the instrument body (1), a first infrared distance measuring sensor and a second infrared distance measuring sensor are arranged on the end face, facing the middle part of the monkey wrench (2), of the instrument body (1), the first infrared distance measuring sensor and the second infrared distance measuring sensor face the center of the monkey wrench (2), the first infrared distance measuring sensor comprises a first transmitting tube (3) and a first receiving tube (4), the second infrared distance measuring sensor comprises a second transmitting tube (5) and a second receiving tube (6), the first receiving tube (4) and the second receiving tube (6) are both connected with a control circuit, the output end of the control circuit is connected with a prompting device (7), the prompting device (7) is arranged on the instrument body (1), and when the first receiving tube (4) receives a first infrared signal transmitted by the first transmitting tube (3), if the first infrared signal intensity is greater than the preset intensity, the first receiving tube (4) sends a first electrifying signal, when the second receiving tube (6) receives a second infrared signal sent by the second transmitting tube (5), if the second infrared signal intensity is greater than the preset intensity, the second receiving tube (6) sends a second electrifying signal, and when the control circuit receives the first electrifying signal and the second electrifying signal simultaneously, the prompting device (7) sends a prompting signal.

2. The current clamp meter of claim 1, wherein: the control circuit includes:

the judging unit (15) is connected with the first receiving tube (4) and the second receiving tube (6) and used for receiving the first electrifying signal and the second electrifying signal and outputting a driving signal when receiving the first electrifying signal and the second electrifying signal simultaneously;

the driving unit (16) is connected with the judging unit (15) and used for receiving the driving signal, and when the driving signal is received, a control signal is output to control a circuit path of the unit where the prompting device (7) is located;

and the control unit (17) is connected with the driving unit (16) and is used for receiving the control signal, and when the control signal is received, the prompting device (7) is electrified to send out a prompting signal.

3. The current clamp meter of claim 2, wherein: the judging unit (15) includes:

AND the AND gate AND is provided with a first input end, a second input end AND an output end, wherein the first input end is connected with the output end of the first receiving tube (4), the second input end is connected with the output end of the second receiving tube (6), AND the output end outputs a driving signal.

4. The current clamp meter of claim 3, wherein: the drive unit (16) comprises:

an NPN triode Q, the base level of which is connected with the output end of the AND gate AND, the emitter of which is grounded through a first resistor R1, a first direct current V1 is connected with a relay KM AND a collector in series, AND the relay KM outputs a control signal;

and the protection circuit is connected with the relay KM in parallel.

5. The current clamp meter of claim 4, wherein: the control unit (17) comprises:

and the normally open switch SA is connected with the relay KM, one end of the normally open switch SA is grounded through a second resistor R2, and a second direct current V2 series prompting device (7) is connected with the other end of the normally open switch SA.

6. The current clamp meter of claim 1, wherein: be provided with axis of rotation (8) in the table body (1), the one end that the table body (1) was kept away from in axis of rotation (8) slides and is connected with adjust knob (9), adjust knob (9) lateral wall circumference is provided with first serration portion (10), be provided with on the table body (1) with first serration portion (10) complex second serration portion (11).

7. The current clamp meter of claim 6, wherein: the adjusting knob (9) is axially provided with a convex rib (12), and the rotating shaft (8) is provided with a sliding groove (13) for the convex rib (12) to slide.

8. The current clamp meter of claim 6, wherein: and a limiting block (14) is arranged at the end part of one end of the rotating shaft (8) far away from the watch body (1).