Single-three-phase electric energy meter PCBA voltage testing device with electric shock prevention function

Abstract

The utility model discloses a single three-phase electric energy meter PCBA voltage testing device with an anti-electric shock function, which comprises a testing tool and a master control system, the testing tool comprises a workbench, a support and a testing area, a lifting rod is arranged between the support and the testing area, the lower end of the lifting rod is connected with a pressing plate, the lower part of the pressing plate is connected with a needle bed, and the needle bed is connected with a probe. The test area is provided with a test point; the upper end of the lifting rod is connected with a handle, the main control system comprises an alternating current power supply, an isolation transformer, a direct current power supply, a relay, a power-on indicator lamp and a travel limit switch, and all the components of the main control system are electrically connected. The testing tool has the advantages that the testing tool is used in cooperation with a main control system, after a PCBA circuit board to be tested is positioned, the pressing plate is manually pressed down, so that the PCBA and a needle bed testing terminal are in full contact, meanwhile, the pressing plate presses the two stroke limiting switches to be switched on at the same time, power-on is started only when a 220V power supply voltage point on a driving needle bed is switched on, and the safety of an operator is protected.

Description

Technical Field

[0001] The utility model relates to the field of electric energy meter testing devices, in particular to a single-phase or three-phase electric energy meter PCBA voltage testing device with an anti-electric shock function. Background Art

[0002] Electric meter manufacturers need a test device to check the voltage of each module circuit of the soldered PCBA circuit board in the manual production line of single-phase and three-phase electric energy meters. Since the power-on voltage of the power-on tool is 220V AC, 220V AC needs to be supplied to the circuit board to be tested. In this case, the circuit board probe carries 220V AC voltage. During the test operation, the operator may touch the AC probe when placing the circuit board, which may cause electric shock. Utility Model Content

[0003] The purpose of the utility model is to overcome the above technical defects and propose a single-phase and three-phase electric energy meter PCBA voltage test device with anti-electric shock function. The device has a simple structure, convenient control, and low cost. It is compatible with single-phase and three-phase electric energy meter PCBA circuit board voltage testing, and can reduce the possibility of electric shock to 0, 100% guarantee the safety of operators, stabilize the enterprise's production safety order, and strengthen enterprise safety management.

[0004] The technical solution adopted by the utility model to achieve its technical purpose is: a single-phase three-phase electric energy meter PCBA voltage test device with an anti-electric shock function, including a test fixture and a main control system, the test fixture includes a workbench, a bracket is arranged on one side of the workbench, and a test area is arranged on the other side, and a lifting rod is also arranged between the bracket and the test area, and the lower end of the lifting rod is connected to a pressing plate, and the pressing plate extends outward and covers above the test area;

[0005] The lower part of the pressing plate is connected to a needle bed, and a test point is provided below the needle bed and in the test area; the upper end of the lifting rod is connected to a handle, and a slot is provided on the top of the bracket, and the lower end of the handle is hinged in the slot through a pin shaft;

[0006] The main control system includes an AC power supply, an isolation transformer, a DC power supply, a relay, a power-on indicator light, and a travel limit switch, and the components of the main control system are electrically connected.

[0007] Preferably, the AC power supply is divided into two paths, which are connected to the test tooling through an isolation transformer. The first path is connected to the input end of the relay, and the output end of the relay is connected to the circuit needle bed, which is used to provide power for PCBA circuit board testing; the second path is connected to the input end of the DC power supply.

[0008] Preferably, the relay model is OMRONMY2N-J24DC.

[0009] Preferably, a single-phase electric energy meter card connection area and a three-phase electric energy meter card connection area are set in the test area, and the two card connection areas are respectively provided with test points corresponding to the needle bed. By replacing the needle bed, the PCBA circuit boards of the single-phase electric energy meter and the three-phase electric energy meter can be compatible tested.

[0010] Preferably, the handle is L-shaped, and a transition frame is connected between the handle and the lifting rod.

[0011] Preferably, the handle is hinged to the transition frame at a corner.

[0012] The beneficial effects of the utility model are as follows: the test fixture is used in conjunction with the main control system, and after the PCBA circuit board to be tested is positioned, the pressing plate is manually pressed down to make the PCBA and the needle bed test terminals fully contact, and at the same time, the pressing plate is pressed until the two travel limit switches are turned on at the same time, and the 220V power supply voltage point on the needle bed is driven to start powering on, and the green indicator light is on after powering on, and the test point after pressing down is completely out of reach for the operator, without the risk of electric shock; after the voltage test is qualified, the pressing plate is pulled up, the green indicator light goes out, and the moment the pressing plate is pulled up, the two travel limit switches are disconnected, the AC voltage at the test point on the needle bed is synchronously powered off, the PCBA is removed, the needle bed is free of strong electricity, and the safety of the operator is protected. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the working principle of the utility model;

[0014] Figure 2 This is a schematic diagram of the test tooling structure;

[0015] Figure 3 This is a schematic diagram of the test fixture from another angle;

[0016] Figure 4 It is a schematic diagram of the structure of the card connection area of ​​a single-phase electric energy meter.

[0017] The following are marked in the figure: 1. Test fixture; 2. Main control system; 3. Workbench; 4. Bracket;

[0018] 5. Test area; 6. Lifting rod; 7. Press plate; 8. Needle bed; 9. Test point; 10. Handle; 11. Card slot; 12. Pin shaft; 13. Transition frame; 21. AC power supply; 22. Isolation transformer; 23. DC power supply; 24. Relay; 25. Power-on indicator light; 26. Travel limit switch; 51. Single-phase electric energy meter card connection area; 52. Three-phase electric energy meter card connection area. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] Embodiment 1

[0021] like Figure 1-3 As shown: a single-phase three-phase electric energy meter PCBA voltage test device with an anti-electric shock function, including a test fixture 1 and a main control system 2, the test fixture 1 includes a workbench 3, a bracket 4 is arranged on one side of the workbench 3, and a test area 5 is arranged on the other side, and a lifting rod 6 is also arranged between the bracket 4 and the test area 5, and the lower end of the lifting rod 6 is connected to a pressing plate 7, and the pressing plate 7 extends outward and covers above the test area 5;

[0022] The lower part of the pressing plate 7 is connected to a needle bed 8, and a test point 9 is provided below the needle bed 8 and in the test area 5; the upper end of the lifting rod 6 is connected to a handle 10, and a slot 11 is provided on the top of the bracket 4, and the lower end of the handle 10 is hinged in the slot 11 through a pin 12;

[0023] The main control system 2 includes an AC power supply 21, an isolation transformer 22, a DC power supply 23, a relay 24, and a power-on indicator light 25. The components of the main control system 2 are electrically connected.

[0024] The AC power supply 21 is connected to the test fixture 1 in two ways, the first way is connected to the input end of the relay 24, and the output end of the relay 24 is connected to the circuit needle bed 8 for providing power for PCBA circuit board testing; the second way is connected to the input end of the DC power supply 23.

[0025] The test area 5 is provided with a single-phase electric energy meter clamping area 51 or a three-phase electric energy meter clamping area 55 , and the two clamping areas are respectively provided with test points 9 corresponding to the needle bed 8 .

[0026] The handle 10 is L-shaped, and a transition frame 13 is connected between the handle 10 and the lifting rod 6 .

[0027] The handle 10 is hinged to the transition frame 13 at a corner.

[0028] The working principle and working process of the utility model are as follows:

[0029] The test device adopts an AC 220V power supply mode. The 220V AC power is directly connected to the red-red wire harness at the input end of a safe AC isolation transformer 22 (input 220V, 50HZ, output 220V, 80W), model: Caixing EI-7642, to isolate dangerous voltages. The blue-blue wire harness at the output end of the isolation transformer 22 is connected to the power control switch at the front end of the test device. The switch has a red prompt light to control the on and off of the 220V AC voltage.

[0030] The 220V AC voltage after the switch is connected to the test fixture 1 in two ways. The first way is connected to the input end of the relay 24. The model of relay 24 is: OMRON MY2N-J 24DC. The output end 220V of relay 24 is connected to the circuit needle bed 8 to provide power for PCBA testing; the second way is connected to the input end L and N of the 24V DC power supply 23. The model of DC power supply 23 is: Mean Well S-75-24, 24V, 3.2A; L is connected to the live wire of 220V, and N is connected to the neutral wire of 220V, which is used to power the 24V DC power supply 23. The ground terminal is connected to the ground terminal of the 220V input terminal of the test device. The DC power supply 23 is divided into two outputs. One DC power supply is directly output to power the five-way DC voltmeter, and the other output is used to power the relay 24. The positive pole of 24V is connected in series with two travel limit switches, and the travel limit switches are connected to the positive pole of the relay 24. The negative pole of the switch power supply is directly connected to the negative pole of the relay 24. The limit switch is installed horizontally, and they must be turned on at the same time after the pressure plate is pressed down to power on. That is, after the travel limit switches are turned on at the same time and the PCBA to be tested is positioned, the two switches can be turned on only after the pressure plate 8 is pressed in by the handle 10. After the test device is powered on, only after the PCBA to be tested is placed and the manual pressure plate is pressed down to fix the PCBA, the two travel limit switches are triggered to turn on, the power supply voltage of the relay 24 is turned on, and the output end of the relay 24 outputs a 220V AC voltage, and the needle bed 8 will be powered on by 220V; when the PCBA is not placed and the pressure plate is not manually pressed down, the 220V voltage is not powered on, thereby protecting the safety of the operator.

[0031] Further description:

[0032] The test tooling is powered by a 220V socket, connected to 220V AC, the main switch is turned on, and the test device starts to power on. At this time, the two 220V test pins on the needle bed 8 of the test device have no 220V AC, which can prevent the operator from electric shock. Put in the PCBA to be tested, and manually press the pressure plate 7 to make the PCBA and the needle bed test terminals fully contact. At this time, the 220V power supply voltage point on the needle bed starts to power on, and the green indicator light on the test device starts to light up. At this time, the operator cannot touch the 220V test point after pressing down, so there is no risk of electric shock; after the voltage test is qualified, the pressure plate is pulled up, and the green indicator light goes out. At the moment the pressure plate is pulled up, the voltage at the test point on the needle bed is simultaneously powered off, and the PCBA is removed. There is no strong electricity on the needle bed, and the safety of the operator is protected.

[0033] By replacing the pallet and the needle bed, they can correspond to the single-phase energy meter and the three-phase energy meter respectively, thereby achieving compatible testing of the PCBA circuit boards of the single-phase energy meter and the three-phase energy meter.

Claims

1. A single-phase or three-phase electric energy meter PCBA voltage test device with anti-electric shock function, including a test fixture and a main control system, characterized in that: The test fixture comprises a workbench, a bracket is arranged on one side of the workbench, a test area is arranged on the other side, a lifting rod is arranged between the bracket and the test area, the lower end of the lifting rod is connected to a pressing plate, and the pressing plate extends outward and covers above the test area; The lower part of the pressing plate is connected to a needle bed, and a test point is provided below the needle bed and in the test area; the upper end of the lifting rod is connected to a handle, and a slot is provided on the top of the bracket, and the lower end of the handle is hinged in the slot through a pin shaft; The main control system includes an AC power supply, an isolation transformer, a DC power supply, a relay, a power-on indicator light, and a travel limit switch, and the components of the main control system are electrically connected.

2. The single-phase or three-phase electric energy meter PCBA voltage test device with anti-electric shock function according to claim 1 is characterized in that: The AC power supply is connected to the test fixture in two ways, the first way is connected to the input end of the relay, and the output end of the relay is connected to the circuit needle bed, which is used to provide power for PCBA circuit board testing; The second path is connected to the input terminal of the DC power supply.

3. The single-phase or three-phase electric energy meter PCBA voltage test device with anti-electric shock function according to claim 2 is characterized in that: The relay model is OMRONMY2N-J24DC.

4. The single-phase or three-phase electric energy meter PCBA voltage test device with anti-electric shock function according to claim 1 is characterized in that: A single-phase electric energy meter card connection area and a three-phase electric energy meter card connection area are set in the test area, and the two card connection areas are respectively provided with test points corresponding to the needle beds. By replacing the needle beds, the PCBA circuit boards of the single-phase electric energy meter and the three-phase electric energy meter can be compatible tested.

5. The single-phase or three-phase electric energy meter PCBA voltage test device with anti-electric shock function according to claim 1 is characterized in that: The handle is L-shaped, and a transition frame is connected between the handle and the lifting rod.

6. The single-phase or three-phase electric energy meter PCBA voltage test device with electric shock protection function according to claim 5 is characterized in that: The handle corner is hinged to the transition frame.

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