CN212781161U - Grounding monitoring and detecting device for safety circuit - Google Patents
Grounding monitoring and detecting device for safety circuit Download PDFInfo
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- CN212781161U CN212781161U CN202021248656.2U CN202021248656U CN212781161U CN 212781161 U CN212781161 U CN 212781161U CN 202021248656 U CN202021248656 U CN 202021248656U CN 212781161 U CN212781161 U CN 212781161U
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Abstract
The utility model discloses a ground connection control detection device for safety circuit relates to electrical control system ground connection detection device's field, has solved the unable technical problem who detects ground connection circuit of control of current electrical control system. The circuit comprises a first power supply end, a second power supply end, a grounding end and a switch protection unit; the first power end is electrically connected with the input end of the switch protection unit, and the output end of the switch protection unit is electrically connected with the second power end through the first indication unit; the output end of the switch protection unit is electrically connected with the grounding end through the second indication unit; the grounding end is electrically connected with the second power end through the monitoring detection unit. The utility model discloses a function that ground fault source automatic monitoring detected improves electrical control system safe operation coefficient.
Description
Technical Field
The utility model relates to an electrical control system ground connection detection device, more specifically say, it relates to a ground connection control detection device for safety circuit.
Background
On an industrial production line, the electrical control system safety circuit is well grounded, which is an important condition for ensuring the safe operation of the system, and particularly an indispensable requirement for protecting operators from electric shock. However, in the operation process of the electrical control system, the phenomena of loosening, breaking, surface corrosive dust rusting and the like of the terminal can occur, so that the grounding of the electrical control system begins to fail; in addition, multiple harmonic waves, electromagnetic interference and other factors exist in the industrial environment where the electric control system is located, a series of electric accidents are often caused by the problem of grounding of the electric control system, the safety coefficient is low, the hidden danger is large, and the normal operation of the electric control system is greatly influenced.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to prior art, provide a ground connection control detection device for safety circuit, realize automatic monitoring and detect ground fault.
The technical scheme of the utility model lies in: a grounding monitoring and detecting device for a safety loop comprises a first power supply end, a second power supply end, a grounding end and a switch protection unit; the first power end is electrically connected with the input end of the switch protection unit, the output end of the switch protection unit is electrically connected with the second power end through the first indication unit, the input end of the first indication unit is electrically connected with the second power end, and the output end of the first indication unit is electrically connected with the output end of the switch protection unit; the output end of the switch protection unit is electrically connected with the grounding end through the second indication unit; the grounding end is electrically connected with the second power supply end through the monitoring detection unit; and the input end of the monitoring detection unit is electrically connected with the grounding end, and the output end of the monitoring detection unit is electrically connected with the second power supply end.
In a further improvement, the monitoring and detecting unit comprises a third resistor and a third indicator light which are connected in series; the input end of the third indicator light is electrically connected with the grounding end, and one end of the third resistor is electrically connected with the second power end.
Further, the first indicating unit comprises a first resistor and a first indicating lamp which are connected in series; the input end of the first indicator light is electrically connected with the second power end, and one end of the first resistor is electrically connected with the output end of the switch protection unit.
Further, the second indicating unit comprises a second resistor and a second indicating lamp which are connected in series; the output end of the second indicator light is electrically connected with the grounding end, and one end of the second resistor is electrically connected with the output end of the switch protection unit.
Further, the switch protection unit includes an air switch and a fuse connected in series; one end of the air switch is electrically connected with the first power end, and one end of the fuse is electrically connected with the output end of the first indicating unit and the input end of the second indicating unit.
Furthermore, the fuse is electrically connected with the output end of the first indicating unit and the input end of the second indicating unit through the power indicator.
Advantageous effects
The utility model has the advantages that: the first power supply end of the grounding monitoring and detecting device is electrically connected with the input end of the switch protection unit, the output end of the switch protection unit is electrically connected with the second power supply end through the first indication unit, and the output end of the switch protection unit is electrically connected with the grounding end through the second indication unit; the grounding end is electrically connected with the second power end through the monitoring detection unit. When the switch protection unit is connected with the circuit, the first indication unit and the second indication unit are powered on to work, and an operator is reminded that the grounding monitoring detection device is started at the moment. If the circuit of earthing terminal breaks down, the earthing terminal is opened a way, and the work of monitoring detecting element is electrified to realized the control detection function to the earthing terminal, practical reliable, great improvement electrical control system safe operation coefficient.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention;
fig. 2 is a schematic view of the panel structure of the present invention.
Wherein: the LED lamp comprises an L-first power supply end, an N-second power supply end, a GND-ground end, an R1-first resistor, an R2-second resistor, an R3-third resistor, an LED 1-first indicator lamp, an LED 2-second indicator lamp, an LED 3-third indicator lamp, a J1-air switch, an FU 1-fuse and an X1-power indicator lamp.
Detailed Description
The present invention will be further described with reference to the following examples, which are not intended to limit the scope of the present invention, but are intended to be covered by the appended claims in any way.
Referring to fig. 1, the utility model discloses a ground connection monitoring detection device for safety circuit, including first power end L, second power end N, earthing terminal GND, switch protection unit. The first power end L is electrically connected with a live wire of the commercial power, and the second power end N is electrically connected with a zero line of the commercial power.
The first power end L is electrically connected with the input end of the switch protection unit, the output end of the switch protection unit is electrically connected with the second power end N through the first indication unit, the input end of the first indication unit is electrically connected with the second power end N, and the output end of the first indication unit is electrically connected with the output end of the switch protection unit; the output end of the switch protection unit is electrically connected with a ground end GND through a second indication unit; the ground end GND is electrically connected with the second power end N through the monitoring detection unit; the input terminal of the monitoring and detecting unit is electrically connected to the ground terminal GND, and the output terminal thereof is electrically connected to the second power terminal N.
When the switch protection unit is connected with the circuit, the first indication unit and the second indication unit are powered on to work, and an operator is reminded that the grounding monitoring detection device is started at the moment. If the ground terminal GND is well grounded, the resistance value of the ground terminal GND is smaller than that of the monitoring detection unit, so that the output of the second indication unit enters the ground terminal GND and is not transmitted to the monitoring detection unit. If the circuit of earthing terminal GND breaks down, when breaking, pine takes off, is corroded absolutely, earthing terminal GND opens the way, and the output of second indicating unit then is carried to the control detecting element this moment, and the control detecting element is electrified work to realized the control detection function to earthing terminal GND, practical reliable, great improvement electrical control system safe operation coefficient.
Specifically, the monitoring detection unit comprises a third resistor R3 and a third indicator light LED3 which are connected in series; the input terminal of the third indicator light LED3 is electrically connected to the ground GND, and one end of the third resistor R3 is electrically connected to the second power terminal N. Wherein the third indicator light LED3 is a red light emitting diode. When earthing terminal GND broke down, third pilot lamp LED3 got to the electricity and is lighted, and whether earthing terminal GND broke down this moment can be known to the operating personnel accessible observation third pilot lamp LED3, had played the effect of in time reporting to the police, control detection, and is simple and convenient in the use of reality.
The first indicating unit includes a first resistor R1 and a first indicator LED1 connected in series; the input end of the first indicator light LED1 is electrically connected to the second power end N, and one end of the first resistor R1 is electrically connected to the output end of the switch protection unit. Wherein the first indicator light LED1 is a green light emitting diode. The first indicator light LED1 is connected between the second power end N and the first power end L and between the second power end N and the ground end GND, and is used for detecting the connecting line between the second power end N and the first power end L or the ground end GND, so that the condition that the system still continues to work when the connecting line is open is avoided, and the reliability of the grounding monitoring and detecting device is improved.
The second indicating unit comprises a second resistor R2 and a second indicating lamp LED2 which are connected in series; the output end of the second indicator light LED2 is electrically connected to the ground GND, and one end of the second resistor R2 is electrically connected to the output end of the switch protection unit. The second indicator light LED2 is a green light emitting diode for indicating whether the ground monitoring detection device is in a normal working state.
The switch protection unit comprises an air switch J1 and a fuse FU1 which are connected in series; one end and the first power end L electric connection of air switch J1, the one end and the output of first indicating unit, the input electric connection of second indicating unit of fuse FU 1. Specifically, one end of the fuse FU1 is electrically connected to one end of the first resistor R1 and one end of the second resistor R2.
Preferably, the fuse FU1 is electrically connected to the output terminal of the first indicating unit and the input terminal of the second indicating unit via the power indicator X1. Specifically, the fuse FU1 is electrically connected to one end of the first resistor R1 and one end of the second resistor R2 via the power indicator X1.
Referring to fig. 2, the ground monitoring and detecting device has a power indicator X1, a first indicator LED1, a second indicator LED2, a third indicator LED3, an air switch J1, and a fuse FU1 all disposed on a panel. Wherein, the power indicator lamp X1 corresponds to the power indication on the panel; the first indicator light LED1 corresponds to normal indication 1 on the panel; the second indicator light LED2 corresponds to normal indication 2 on the panel; the third indicator light LED3 corresponds to an anomaly indication on the panel; the air switch J1 is corresponding to the on-off of the panel; fuse FU1 corresponds to a fuse on the panel. The arrangement is simple and convenient to operate, and a display interface can be visually provided for an operator, so that the operator can rapidly judge whether the grounding of the electrical control system is in fault.
The utility model discloses a theory of operation is: connecting three wiring terminals of a first power end L, a second power end N and a ground end GND into a live wire, a zero wire and a ground wire of commercial power respectively according to requirements; the air switch J1 on the panel is then toggled to the "on" position. At this time, the power indicator lamp X1 is lighted; if there is a dim, fuse FU1 is checked for blowing, and if blown, it is replaced. In the normal operation state of the ground monitoring and detecting device, the first indicator light LED1 and the second indicator light LED2 are both turned on, and the third indicator light LED3 is turned off. The reason is that when the ground end GND is normal, the ground resistance is small and close to zero; and the sum of the resistances of the third indicator light LED3 and the third resistor R3 is much larger than the ground resistance. Therefore, the current flowing through the second indicator light LED2 directly flows into the ground GND and does not flow through the monitoring detection unit, so the third indicator light LED3 is not turned on when the electrical system is grounded normally.
In this embodiment, the two power terminals are respectively connected to the live line and the zero line of the alternating current, and the waveform of the alternating current is a sine wave. Therefore, the light emitting diode with polarity is directly connected into the alternating current circuit, and the light emitting diode can only utilize partial electric energy of the alternating current. The anode of the first indicator light LED1 of the present embodiment is connected to the second power terminal N, i.e., to the neutral line; and the anode of the second indicator light LED2 is connected to the live wire through the switch protection unit. When the alternating current waveform is positioned in the upper chord region, the alternating current is enabled to the second indicator light LED2, the second indicator light LED2 is powered on, and the first indicator light LED1 is cut off and is not powered on; when the AC waveform is in the lower chord region, the AC power is enabled to the first indicator light LED1, the first indicator light LED1 is powered on, and the second indicator light LED2 is not powered off. And because the frequency of alternating current is 50Hz for the flashing speed of pilot lamp is very fast, outside the scope that human eye can perceive, consequently can not influence operating personnel to the observation of pilot lamp.
When the ground GND line fails, current cannot flow into the ground after passing through the second indicator light LED 2. Since the cathode of the second indicator LED2 is connected to the anode of the third indicator LED3, the current flows to the third indicator LED3 and finally to the second power terminal N to form a loop. At this time, the third indicator light LED3 is turned on, thereby playing the role of timely alarming, monitoring and detecting. When the electrical control system does not need the grounding monitoring detection, the air switch J1 on the panel is turned to the 'off' position, and the grounding monitoring detection device stops working.
The above is only the preferred embodiment of the present invention, and it should be noted that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the utility model and the utility of the patent.
Claims (6)
1. A grounding monitoring and detecting device for a safety loop is characterized by comprising a first power supply end L, a second power supply end N, a grounding end GND and a switch protection unit; the first power end L is electrically connected with the input end of the switch protection unit, the output end of the switch protection unit is electrically connected with the second power end N through the first indication unit, the input end of the first indication unit is electrically connected with the second power end N, and the output end of the first indication unit is electrically connected with the output end of the switch protection unit; the output end of the switch protection unit is electrically connected with a ground end GND through a second indication unit; the ground end GND is electrically connected with the second power end N through the monitoring detection unit; and the input end of the monitoring detection unit is electrically connected with the ground end GND, and the output end of the monitoring detection unit is electrically connected with the second power end N.
2. The ground monitoring and detecting device for a safety circuit as claimed in claim 1, wherein said monitoring and detecting unit comprises a third resistor R3 and a third indicator light LED3 connected in series; an input end of the third indicator light LED3 is electrically connected to a ground GND, and one end of the third resistor R3 is electrically connected to the second power terminal N.
3. The ground monitoring and detecting device for a safety circuit as claimed in claim 1, wherein said first indicating unit comprises a first resistor R1 and a first indicator light LED1 connected in series; the input end of the first indicator light LED1 is electrically connected to the second power end N, and one end of the first resistor R1 is electrically connected to the output end of the switch protection unit.
4. The ground monitoring and detecting device for a safety circuit as claimed in claim 1, wherein said second indicating unit comprises a second resistor R2 and a second indicating lamp LED2 connected in series; the output end of the second indicator light LED2 is electrically connected to the ground GND, and one end of the second resistor R2 is electrically connected to the output end of the switch protection unit.
5. The ground monitoring and detecting device for a safety circuit according to any one of claims 1 to 4, wherein said switch protection unit comprises an air switch J1 and a fuse FU1 connected in series; one end of the air switch J1 is electrically connected with a first power end L, and one end of the fuse FU1 is electrically connected with the output end of the first indicating unit and the input end of the second indicating unit.
6. The apparatus as claimed in claim 5, wherein the fuse FU1 is electrically connected to the output terminal of the first indicator unit and the input terminal 1 of the second indicator unit via a power indicator lamp X1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021248656.2U CN212781161U (en) | 2020-06-30 | 2020-06-30 | Grounding monitoring and detecting device for safety circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021248656.2U CN212781161U (en) | 2020-06-30 | 2020-06-30 | Grounding monitoring and detecting device for safety circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212781161U true CN212781161U (en) | 2021-03-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021248656.2U Active CN212781161U (en) | 2020-06-30 | 2020-06-30 | Grounding monitoring and detecting device for safety circuit |
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| Country | Link |
|---|---|
| CN (1) | CN212781161U (en) |
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2020
- 2020-06-30 CN CN202021248656.2U patent/CN212781161U/en active Active
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