CN220575063U - Safety protection device for preventing electric welding machine shell from being ungrounded - Google Patents
Safety protection device for preventing electric welding machine shell from being ungrounded Download PDFInfo
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- CN220575063U CN220575063U CN202321889575.4U CN202321889575U CN220575063U CN 220575063 U CN220575063 U CN 220575063U CN 202321889575 U CN202321889575 U CN 202321889575U CN 220575063 U CN220575063 U CN 220575063U
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- 238000003466 welding Methods 0.000 title claims abstract description 77
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model provides a safety protection device for preventing an electric welding machine shell from being ungrounded, which comprises a grounding resistance tester arranged in the electric welding machine, wherein an applied current end of the grounding resistance tester is connected to a power line ground wire of the electric welding machine through a lead, a test switch is arranged on the lead, and a measuring end of the grounding resistance tester is connected to a connecting part of the electric welding machine shell ground wire. The device is convenient to judge the grounding condition of the electric welding machine, and avoids production accidents caused by the grounding faults of the shell.
Description
Technical Field
The utility model relates to the field of auxiliary equipment of electric welding machines, in particular to a safety protection device for preventing an outer shell of an electric welding machine from being ungrounded.
Background
The electric welding machine is an electric tool commonly used in a production field, and according to the safety regulation requirement, the shell of the electric welding machine must be reliably grounded before electric welding operation, but in actual operation, the illegal operation behavior that the shell of the electric welding machine is not grounded is often existed, and meanwhile, the situation that the grounding resistance of the shell is larger is also existed, so that personnel or equipment safety accidents can be caused.
The prior supervision technology comprises the following steps:
(1) The field guardian asks the electric welding operator to ground the shell of the electric welding machine before electric welding operation;
(2) It is necessary to determine whether the grounding of the welding machine housing is good by means of a multimeter or the like.
Defects and deficiencies:
the on-site guardianship personnel can not do real-time all-round guardianship, and especially when the operation face scope is wide, guardianship personnel need take into account other operations, probably have the operation personnel not reliably ground the welding machine shell, the operation of violating regulations has the potential safety hazard.
If the operation site is free of instruments such as a universal meter, the grounding condition is difficult to judge by naked eyes, if the virtual connection or the unreliable grounding condition exists, the operation risk exists, and when the electric welding machine is in a fault state and the shell is electrified, the safety accident of personnel clicking can be caused.
Disclosure of Invention
The utility model aims to solve the technical problem of providing a safety protection device for preventing an outer shell of an electric welding machine from being ungrounded, which is convenient for judging the grounding condition of the electric welding machine and avoids production accidents caused by the grounding fault of the outer shell.
In order to solve the technical problems, the utility model adopts the following technical scheme: the utility model provides a prevent safety device of electric welding shell ungrounded, includes the ground resistance tester of setting in the inside of electric welding, the current end of applys of ground resistance tester inserts electric welding power cord ground wire through the wire, is equipped with test switch on the wire, and the junction of electric welding shell ground wire is inserted to the measuring end of ground resistance tester.
In the preferred scheme, a live wire switch is arranged on an A-phase live wire of the electric welding machine.
In the preferred scheme, the intelligent control system comprises a switch controller, wherein the switch controller is connected with a ground resistance tester and controls the start and stop of a test switch and a live wire switch.
According to the safety protection device for preventing the electric welding machine shell from being ungrounded, provided by the utility model, whether the electric welding machine power supply is connected is judged by detecting whether the resistance of the grounding wire of the electric welding machine shell is qualified, so that the intrinsic safety design is realized, the ungrounded illegal action of the shell when an operator uses the electric welding machine is completely avoided, meanwhile, the operation risk caused by overlarge grounding resistance of the shell is eliminated, and the production accident caused by the grounding fault of the shell is avoided. When the device is used on site, instruments such as a universal meter are not required to be carried, and site guardianship personnel can effectively control the live fire operation site. The device is suitable for three-phase alternating current welding machines and 220V direct current welding machines, is also suitable for electrical equipment with a shell which needs good grounding, and can be widely used. The design is simple and reliable, and the structure principle of the original electric welding machine is not changed basically.
Drawings
The utility model is further described below with reference to the accompanying drawings and examples of implementation:
FIG. 1 is a schematic diagram of the overall structure of the present utility model;
FIG. 2 is a schematic view of the preferred overall structure of the present utility model;
in the figure: the electric welding machine comprises an electric welding machine 1, a grounding resistance tester 2, a conducting wire 3, an electric welding machine power wire ground wire 4, a test switch 5, an electric welding machine shell ground wire 6, an A-phase live wire 7, a live wire switch 8 and a switch controller 9.
Detailed Description
As shown in fig. 1, a safety protection device for preventing an outer casing of an electric welding machine from being not grounded comprises a grounding resistance tester 2 arranged inside the electric welding machine 1, wherein the grounding resistance tester 2 can be a digital grounding resistance tester with a smart electric design in Shanghai, the grounding resistance tester 2 is arranged in the electric welding machine 1, and an operation panel of the grounding resistance tester 2 is arranged on an operation window on a shell of the electric welding machine 1.
The current applying end of the grounding resistance tester 2 is connected into the power line and the ground wire 4 of the electric welding machine through a lead 3, a test switch 5 is arranged on the lead 3, and the measuring end of the grounding resistance tester 2 is connected into the connecting part of the ground wire 6 of the outer shell of the electric welding machine. The grounding resistance is obtained by measuring the voltages at two ends, so that whether the shell of the electric welding machine is well grounded or not is judged. If the ground wire on the power line side is well grounded, if the measured ground resistance is too large, the ground fault of the shell of the electric welding machine is judged, and the electric welding machine should be grounded again until the grounding is qualified.
Preferably, a live wire switch 8 is arranged on the A-phase live wire 7 of the electric welding machine 1. The live wire switch 8 is a normally open switch, if the measured grounding resistance is overlarge, the phase A live wire 7 is in an off state, at the moment, the switch of the electric welding machine is started, the power supply of the electric welding machine is on, and due to the lack of the phase A live wire, the power supply cannot be on, and the electric welding machine cannot be started for use.
If the electric welding machine is a three-phase alternating current welding machine, the live wire switch 8 is arranged on the A-phase live wire, and if the electric welding machine is a 220V direct current welding machine, only one live wire A-phase is arranged.
Preferably, as shown in fig. 2, the switch controller 9 is included, and an LM5175PWPR htstop-28 switch controller can be specifically selected, the switch controller 9 is connected with the ground resistance tester 2, and the switch controller 9 controls the on-off of the test switch 5 and the live wire switch 8. By providing the switch controller 9, the test switch 5 and the live wire switch 8 are automatically controlled according to the measurement result of the ground resistance tester 2.
The specific use is as follows:
step one, switching on a wire inlet power supply of the electric welding machine 1, connecting a power wire ground wire, and grounding a shell ground wire 6 of the electric welding machine.
And step two, pressing the test switch 5, and starting to measure the grounding resistance by the grounding resistance tester 2.
If the grounding resistance R is smaller than 4 ohms, the grounding resistance is qualified, the trigger signal is that the live wire switch 8 is closed, meanwhile, the test switch 5 is opened, the grounding resistance tester 2 stops working, the electric welding machine switch is pressed down to start, the power supply is turned on, and the electric welding machine can start to be used.
If the grounding resistance R is larger than 4 ohms, the grounding resistance is unqualified, a trigger signal is not sent out, the live wire switch 8 is kept normally open, meanwhile, the test switch 5 is disconnected, and the grounding resistance tester stops working. At this time, if the switch of the electric welding machine is pressed down, the power supply cannot be switched on due to the lack of a phase of live wire, and the electric welding machine cannot be started for use.
And thirdly, after the electric welding machine is used, turning off a switch of the electric welding machine, triggering a test switch 5 to be turned off, and keeping the normally open state.
And fourthly, restarting from the first step when the electric welding machine is used next time.
The device judges whether the electric welding machine power supply is connected or not by detecting whether the grounding wire resistance of the electric welding machine shell is qualified or not, achieves the intrinsic safety design, completely avoids the illegal action that the shell is not grounded when an operator uses the electric welding machine, simultaneously eliminates the operation risk existing due to overlarge grounding resistance of the shell, and avoids the production accident caused by the grounding fault of the shell. When the device is used on site, instruments such as a universal meter are not required to be carried, and site guardianship personnel can effectively control the live fire operation site.
The device is suitable for three-phase alternating current welding machines and 220V direct current welding machines, is also suitable for electrical equipment with a shell which needs good grounding, and can be widely used. The design is simple and reliable, and the structure principle of the original electric welding machine is not changed basically.
Claims (3)
1. A safety device for preventing an electric welding machine housing from being ungrounded, comprising: the electric welding machine comprises a grounding resistance tester (2) arranged inside an electric welding machine (1), wherein the current application end of the grounding resistance tester (2) is connected into a power line ground wire (4) of the electric welding machine through a lead (3), a test switch (5) is arranged on the lead (3), and the measuring end of the grounding resistance tester (2) is connected into the connecting part of a ground wire (6) of a casing of the electric welding machine.
2. A safety shield apparatus for preventing an ungrounded welding bug envelope as claimed in claim 1, wherein: a live wire switch (8) is arranged on an A-phase live wire (7) of the electric welding machine (1).
3. A safety shield apparatus for preventing an ungrounded welding bug casing as claimed in claim 2, wherein: the device comprises a switch controller (9), wherein the switch controller (9) is connected with a ground resistance tester (2), and the switch controller (9) controls the start and stop of a test switch (5) and a live wire switch (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321889575.4U CN220575063U (en) | 2023-07-18 | 2023-07-18 | Safety protection device for preventing electric welding machine shell from being ungrounded |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321889575.4U CN220575063U (en) | 2023-07-18 | 2023-07-18 | Safety protection device for preventing electric welding machine shell from being ungrounded |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220575063U true CN220575063U (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321889575.4U Active CN220575063U (en) | 2023-07-18 | 2023-07-18 | Safety protection device for preventing electric welding machine shell from being ungrounded |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220575063U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117921139A (en) * | 2024-03-25 | 2024-04-26 | 中国矿业大学(北京) | Welding machine operation monitoring device, method and system based on power grid end |
-
2023
- 2023-07-18 CN CN202321889575.4U patent/CN220575063U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117921139A (en) * | 2024-03-25 | 2024-04-26 | 中国矿业大学(北京) | Welding machine operation monitoring device, method and system based on power grid end |
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