CN104698284B - Detection tool for detecting grounding resistance of electric tool or electric heating tool - Google Patents
Detection tool for detecting grounding resistance of electric tool or electric heating tool Download PDFInfo
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- CN104698284B CN104698284B CN201310655069.3A CN201310655069A CN104698284B CN 104698284 B CN104698284 B CN 104698284B CN 201310655069 A CN201310655069 A CN 201310655069A CN 104698284 B CN104698284 B CN 104698284B
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- resistance
- electric heating
- indicator lamp
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- 238000005485 electric heating Methods 0.000 title claims abstract description 37
- 238000001514 detection method Methods 0.000 title abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 8
- 229910052751 metal Inorganic materials 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000007689 inspection Methods 0.000 description 8
- 230000005611 electricity Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000003556 assay Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 241000036318 Callitris preissii Species 0.000 description 1
- 241000218202 Coptis Species 0.000 description 1
- 235000002991 Coptis groenlandica Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention provides a detection tool for detecting the grounding resistance of an electric tool or an electric heating tool, which comprises a box body and a voltage comparison circuit, wherein the box body is provided with a single-phase three-hole socket for plugging a plug of the electric tool or the electric heating tool, and the grounding end of the single-phase three-hole socket is grounded; the box body is also provided with a metal contact electrically connected with the voltage comparison circuit, and the grounding end of the single-phase three-hole socket is electrically connected with the voltage comparison circuit; the voltage comparison circuit is used for detecting the grounding resistance of the electric tool or the electric heating tool when the exposed metal end of the head of the electric tool or the electric heating tool is contacted with the metal contact. The detection tool for detecting the ground resistance of the electric tool or the electric heating tool solves the problem that the ground resistance of the electric tool or the electric heating tool is inconvenient to perform point detection by adopting a universal meter, improves the point detection efficiency, has the foolproof and mistake-proofing functions, improves the reliability of the point detection work, and improves the process level.
Description
Technical field
The present invention relates to electric field, more particularly to a kind of grounding resistance for being used to detect electric tool or electric heating tool
Detecting tool.
Background technology
In controller assembling process, electric screwdriver screwdriver bit, glue rifle pipette tips, the first-class electric tool of electric iron or electric heating tool can connect
Contact mainboard, PUR pipette tips, electric screwdriver screwdriver bit etc. it is powered may directly result in semiconductor devices gold thread blow or chip lose
Effect, to prevent the generation of the hidden danger, it is desirable to must be periodically to the ground connection of the electric heating tools such as thermosol gelgun, electric screwdriver or electric tool electricity
Resistance carries out an inspection, and by taking electric iron as an example, detecting method is:1. by the solder horn wiped clean of electric iron to be measured.2. by universal meter
Two nibs contact solder horn and plug ground wire respectively.3. after numerical stability is shown, resistance value is read, when its grounding resistance
≤ 25 ohm are qualified, otherwise to be unqualified.Problems be present in the detecting method：1st, fallen behind with universal meter detecting method, behaviour
Make extremely inconvenient, often need two people to coordinate and complete, the instrument that particularly controller subsidiary factory is related to examines task weight compared with multiple spot, spends
Plenty of time, manpower；2nd, whether qualified can not directly export with the inspection of universal meter point, need to artificially judge, check staff is required compared with
It is high.
The content of the invention
In view of the present situation of prior art, is used to detect electric tool or electric heating tool it is an object of the invention to provide one kind
Grounding resistance detecting tool, its improve point inspection efficiency, securely and reliably.To achieve the above object, technical scheme
It is as follows：
A kind of detecting tool for being used to detect the grounding resistance of electric tool or electric heating tool, including casing and voltage ratio compared with
Circuit；
The single-phase three-hole socket of the plug for electric tool described in grafting or electric heating tool, institute are provided with the casing
State the earth terminal ground connection of single-phase three-hole socket；
The hard contact electrically connected with the voltage comparator circuit, the single-phase three-hole socket are additionally provided with the casing
Earth terminal electrically connected with the voltage comparator circuit；
When the bare metal end of the electric tool or the head of electric heating tool contacts with the hard contact, the electricity
Pressure comparison circuit is used for the grounding resistance for detecting the electric tool or electric heating tool.
In one of the embodiments, the voltage comparator circuit includes comparator, first resistor, second resistance, the 3rd
Resistance, the 4th resistance and the first indicator lamp；
The first input end series connection 3rd resistor of the comparator is coupled to external power, the second input of the comparator
End series connection first resistor be coupled to the external power, and the second input of comparator second resistance of also connecting connects
To the hard contact, output end series connection the first indicator lamp ground connection of the comparator.
In one of the embodiments, the voltage comparator circuit also includes phase inverter and the second indicator lamp；
Second indicator lamp described in the inverter series is grounded, the phase inverter, the second indicator lamp after series connection with it is described
First indicator lamp is in parallel.
In one of the embodiments, first indicator lamp is red light, and second indicator lamp is green light.
In one of the embodiments, the voltage comparator circuit also includes alarm, the alarm and described first
Indicator lamp is in parallel.
In one of the embodiments, the model SN74LS14 of the phase inverter.
In one of the embodiments, the first resistor is identical with the resistance of the 3rd resistor.
In one of the embodiments, the difference of the resistance of the 4th resistance and the second resistance is 25 ± 0.5 ohm.
In one of the embodiments, the model LM324 of the comparator.
The beneficial effects of the invention are as follows：
The detecting tool for being used to detect the grounding resistance of electric tool or electric heating tool of the present invention, is solved using general-purpose
Table point examines the inconvenient problem of electric tool or electric heating tool grounding resistance, and using the detecting tool, a people can be easily complete
Into an inspection, point inspection efficiency is improved；Assay is directly perceived, without artificial judgment, has fool proof error-disable function, and improving point inspection work can
By property, technological level is improved.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of detecting tool one of the grounding resistance for detecting electric tool or electric heating tool
Figure；
Fig. 2 is the schematic diagram of voltage comparator circuit；
Fig. 3 is the Cleaning Principle schematic diagram of voltage comparator circuit shown in Fig. 2.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with drawings and Examples pair
The detecting tool of the grounding resistance for detecting electric tool or electric heating tool of the present invention is further elaborated.Should
Understand, specific embodiment described herein is only used for explaining the present invention, is not intended to limit the present invention.
Referring to figs. 1 to Fig. 3, the detecting tool one for being used to detect the grounding resistance of electric tool or electric heating tool of the invention
Embodiment includes casing 1 and voltage comparator circuit, is provided with casing 1 for the plug of grafting electric tool or electric heating tool
Single-phase three-hole socket 2, the earth terminal ground connection of single-phase three-hole socket 2, the jack of the centre of single-phase three-hole socket 2 are earth terminal, case
The hard contact 3 electrically connected with voltage comparator circuit is additionally provided with body 1, hard contact 3 is connected with X2, single-phase three-hole socket 2
Earth terminal electrically connected with voltage comparator circuit.
When the bare metal end of tested electric tool or the head of electric heating tool contacts with hard contact 3, voltage ratio compared with
Circuit is used for the grounding resistance for detecting tested electric tool or electric heating tool.Electric tool can be electric screwdriver（Electric screw driver）, electricity
Hot tool can be glue rifle or electric iron.
As shown in Figures 2 and 3, voltage comparator circuit includes comparator U1, first resistor R1, second resistance R2, the 3rd electricity
Hinder R3, the 4th resistance R4 and the first indicator lamp D1.
Comparator U1 first input end series connection 3rd resistor R3 is coupled to external power VCC, and the second of comparator U1 is defeated
Enter end series connection first resistor R1 and be coupled to external power VCC, comparator U1 the second input is also connected second resistance R2 connections
To hard contact 3, comparator U1 output end series connection the first indicator lamp D1 ground connection.Comparator U1 model LM324, wherein,
Comparator U1 the 2nd pin is first input end, and comparator U1 the 3rd pin is the second input, comparator U1 the 1st pin
For output end, comparator U1 the 4th pin meets external power VCC, and comparator U1 the 11st pin is grounded, and the GND in figure is represented
Ground connection, VCC voltage is+5V.
Preferably, voltage comparator circuit also includes phase inverter U2 and the instruction of the second indicator lamp D2, phase inverter U2 series connection second
Lamp D2 is grounded, and the phase inverter U2, the second indicator lamp D2 after series connection are in parallel with the first indicator lamp D1.Wherein, the model of phase inverter
SN74LS14, the first indicator lamp D1 are red light, and the second indicator lamp D2 is green light.Indicator lamp mounting hole and socket are set on casing 1
Mounting hole, the first indicator lamp D1 and the second indicator lamp D2 are placed in indicator lamp mounting hole, and single-phase three-hole socket 3 is placed in socket installation
In hole.To make testing result more directly perceived, voltage comparator circuit also includes alarm, and alarm is in parallel with the first indicator lamp D1.
Preferably, first resistor R1 is identical with the resistance of the 3rd resistor R3, the 4th resistance R4 and second resistance R2's
The difference of resistance is 25 ± 0.5 ohm.That is, R1=R3, R4-R2=25 ± 0.5 ohm.
During detection, the attaching plug of electric tool or electric heating tool insertion single-phase three-hole socket 2, then by electric tool or
The bare metal end on the head of electric heating tool contacts with hard contact 3, and now detecting tool will detect electric tool or electric heating work
The grounding resistance of tool, the second indicator lamp D2 is bright if meeting to require, represents that testing result is qualified, and first refers to if being unsatisfactory for requiring
Show that lamp D1 is bright, represent that testing result is unqualified.
In figs. 2 and 3, wherein, X1 is the earth terminal of single-phase three-hole socket 2, and X2 is connected with hard contact 3, electric heating work
The connection of bare metal end X2, X1 and the X2 on the head of the earth terminal of tool or electric tool connection X1, electric heating tool or electric tool
Between resistance sizes be tested electric heating tool or electric tool grounding resistance.
Operation principle：This frock utilizes voltage comparator characteristic, i.e. it is defeated to be more than "-" for comparator U1 "+" input terminal voltage
Entering end, then comparator U1 exports high level, when "+" input terminal voltage is less than "-" input then comparator output low level.With Fig. 3
Exemplified by illustrate, in this programme, comparator U1 "-" input simultaneously couples 3rd resistor R3 and the 4th resistance R4, wherein the 3rd
Resistance R3 another termination external power VCC, VCC=5V, the 4th resistance R4 other end ground connection, then comparator U1 "-" end is defeated
Enter voltageComparator U1 "+" input simultaneously couples first resistor R1 and second resistance R2, the first electricity
The resistance R1 other end also meets external power VCC, VCC=5V, and the second resistance R2 other ends are grounded after being connected with resistance Rx, wherein Rx
The "+" end input voltage of the grounding resistance, then comparator U1 of as tested electric heating tool or electric toolBecause grounding resistance alarm threshold value is 25 ohm in the example, i.e., when tested instrument connects
The second indicator lamp D2 is bright when ground resistance is less than 25 ohm, and during more than 25 ohm, then the first indicator lamp D1 is bright, so setting R1=R3,
R4-R2=25.With Rx change, V2 can also change, when Rx is less than 25 ohm, V2<V1, the low electricity of now comparator U1 outputs
It is flat, drive the second indicator lamp D2 bright by phase inverter U2；When Rx is more than 25 ohm, V2>V1, comparator U1 output high level are straight
It is bright to meet the first indicator lamp D1 of driving.
The detecting tool for being used to detect the grounding resistance of electric tool or electric heating tool of above example, solves use
Universal meter point examines the inconvenient problem of electric tool or electric heating tool grounding resistance, and using the detecting tool, a people can be light
Pine completes point inspection, improves point inspection efficiency；Assay exports automatically, without artificial judgment, has fool proof error-disable function, improves point
Functional reliability is examined, improves technological level.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (9)
- A kind of 1. detecting tool for being used to detect the grounding resistance of electric tool or electric heating tool, it is characterised in that：Including casing and voltage comparator circuit；The single-phase three-hole socket of the plug for electric tool described in grafting or electric heating tool, the list are provided with the casing The earth terminal ground connection of phase Three-hole socket；The hard contact electrically connected with the voltage comparator circuit is additionally provided with the casing, the single-phase three-hole socket connects Ground terminal electrically connects with the voltage comparator circuit；When the bare metal end of the electric tool or the head of electric heating tool contacts with the hard contact, the voltage ratio It is used for the grounding resistance for detecting the electric tool or electric heating tool compared with circuit.
- 2. detecting tool according to claim 1, it is characterised in that：The voltage comparator circuit includes comparator, first resistor, second resistance, 3rd resistor, the 4th resistance and the first instruction Lamp；The first input end series connection 3rd resistor of the comparator is coupled to external power, the second input string of the comparator Connection first resistor is coupled to the external power, and the second input of comparator second resistance of also connecting is connected to institute State hard contact, output end series connection the first indicator lamp ground connection of the comparator.
- 3. detecting tool according to claim 2, it is characterised in that：The voltage comparator circuit also includes phase inverter and the second indicator lamp；Second indicator lamp described in the inverter series is grounded, the phase inverter, the second indicator lamp and described first after series connection Indicator lamp is in parallel.
- 4. detecting tool according to claim 3, it is characterised in that：First indicator lamp is red light, and second indicator lamp is green light.
- 5. detecting tool according to claim 3, it is characterised in that：The voltage comparator circuit also includes alarm, and the alarm is in parallel with first indicator lamp.
- 6. detecting tool according to claim 3, it is characterised in that：The model SN74LS14 of the phase inverter.
- 7. according to the detecting tool described in claim any one of 2-6, it is characterised in that：The first resistor is identical with the resistance of the 3rd resistor.
- 8. detecting tool according to claim 7, it is characterised in that：The difference of the resistance of 4th resistance and the second resistance is 25 ± 0.5 ohm.
- 9. detecting tool according to claim 7, it is characterised in that：The model LM324 of the comparator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655069.3A CN104698284B (en) | 2013-12-05 | 2013-12-05 | Detection tool for detecting grounding resistance of electric tool or electric heating tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310655069.3A CN104698284B (en) | 2013-12-05 | 2013-12-05 | Detection tool for detecting grounding resistance of electric tool or electric heating tool |
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| Publication Number | Publication Date |
|---|---|
| CN104698284A CN104698284A (en) | 2015-06-10 |
| CN104698284B true CN104698284B (en) | 2018-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310655069.3A Expired - Fee Related CN104698284B (en) | 2013-12-05 | 2013-12-05 | Detection tool for detecting grounding resistance of electric tool or electric heating tool |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034933A (en) * | 2021-11-12 | 2022-02-11 | 陕西省地方电力(集团)有限公司渭南供电分公司 | Detection circuit for ground wire grounding resistance |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2121695U (en) * | 1992-04-28 | 1992-11-11 | 东北电力学院 | Ground resistance admeasuring apparatus |
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| CN201707405U (en) * | 2010-05-10 | 2011-01-12 | 广东省机械研究所 | Comprehensive tester for safety performance of electric tool |
| CN202057749U (en) * | 2011-05-17 | 2011-11-30 | 李英岱 | Instrument for detecting and displaying ground state of equipment or socket |
| CN203643509U (en) * | 2013-12-05 | 2014-06-11 | 珠海格力电器股份有限公司 | Detection tool for detecting grounding resistance of electric tool or electric heating tool |
-
2013
- 2013-12-05 CN CN201310655069.3A patent/CN104698284B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2121695U (en) * | 1992-04-28 | 1992-11-11 | 东北电力学院 | Ground resistance admeasuring apparatus |
| CN1150249A (en) * | 1995-11-10 | 1997-05-21 | 中国科学院空间科学与应用研究中心 | Ground resistance tester controlled by computer |
| US6208146B1 (en) * | 1999-02-08 | 2001-03-27 | General Motors Corporation | Method and apparatus for measuring contact resistance for spot welding simulations |
| CN201707405U (en) * | 2010-05-10 | 2011-01-12 | 广东省机械研究所 | Comprehensive tester for safety performance of electric tool |
| CN202057749U (en) * | 2011-05-17 | 2011-11-30 | 李英岱 | Instrument for detecting and displaying ground state of equipment or socket |
| CN203643509U (en) * | 2013-12-05 | 2014-06-11 | 珠海格力电器股份有限公司 | Detection tool for detecting grounding resistance of electric tool or electric heating tool |
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| CN104698284A (en) | 2015-06-10 |
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Granted publication date: 20180119 |