Loop resistance tester

Abstract

The utility model discloses a loop resistance tester, which comprises a tester box body, a loop resistance tester body is arranged in the tester box body, a tester switch is arranged above the loop resistance tester body, a mounting plate is arranged on the left side of the loop resistance tester body, and the tester switch is arranged on the right side of the mounting plate. Voltage input jacks are formed in the two ends of the upper portion of the mounting plate, limiting half cylinders are mounted at the front ends and the rear ends of the upper portions of the voltage input jacks, auxiliary plates are mounted on the right sides of the limiting half cylinders, limiting auxiliary rods are arranged in the auxiliary plates in a penetrating mode, and adjusting plates are fixedly mounted on the left sides of the limiting half cylinders; according to the loop resistance tester, the voltage input jack in the loop resistance tester body is transferred to the mounting plate, then the bidirectional motor is used for driving the bidirectional adjusting lead screw to rotate, and the two limiting half cylinders are pushed to be folded to wrap the voltage input jack and the limiting plate together; therefore, the current output binding post is prevented from being touched off by mistake when the loop resistance tester body works.

Description

Technical Field

[0001] This utility model relates to the technical field of loop resistance testers, specifically a loop resistance tester. Background Technology

[0002] A loop resistance tester, also known as a contact resistance tester, is an instrument specifically designed to measure the contact resistance and loop resistance of switch control equipment. The loop resistance tester is designed using a combination of high-frequency switching power supply technology and digital circuit technology. Its working principle is mainly to apply a constant DC current and then measure the voltage drop generated when the current passes through the device under test, thereby calculating the value of the contact resistance or loop resistance.

[0003] Chinese Patent Publication No. CN207703939U discloses a loop resistance tester, including a cover, a body, and a bottom lifting frame. The cover has an L-shaped protruding end; one side of the cover is rotatably connected to one side of the body, and the other side of the cover is detachably snap-fitted to the other side of the body; the upper surface of the body has a groove along its edge; the cover matches the groove; an operation panel is provided on the body; the control panel is located on the upper surface of the body; a microprocessor is housed inside the body; and the bottom lifting frame is fixed to the lower surface of the body. This invention facilitates the storage of test leads, accommodates different heights, and the microprocessor can quickly process the loop resistance tester's data, ensuring fast, accurate, and precise testing.

[0004] Existing loop resistance testers require connecting the tester to the object under test via a measuring cable, which involves pulling a considerable amount of cable and increases the likelihood of accidental contact. Accidental contact can cause the current output terminal to detach from the voltage input jack, affecting the measurement results. Therefore, we propose a new loop resistance tester. Utility Model Content

[0005] The purpose of this invention is to provide a loop resistance tester to solve the problem mentioned in the background art that existing loop resistance testers require connecting the tester to the object being measured via a measuring line, which requires pulling a lot of long measuring lines, increasing the probability of accidental contact with the measuring lines. Accidental contact with the measuring lines can easily cause the current output terminal to fall out of the voltage input jack, affecting the measurement results.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a loop resistance tester, comprising a tester housing, a loop resistance tester body installed inside the tester housing, a tester switch located above the loop resistance tester body, a mounting plate installed on the left side of the loop resistance tester body, voltage input sockets installed at both ends of the upper part of the mounting plate, a limiting half-cylinder installed at the front and rear ends of the upper part of the voltage input socket, an auxiliary plate installed on the right side of the limiting half-cylinder, a limiting auxiliary rod passing through the interior of the auxiliary plate, an adjusting plate fixedly installed on the left side of the limiting half-cylinder, a bidirectional motor installed on the upper middle left side of the mounting plate, a bidirectional adjusting screw installed at the output end of the bidirectional motor, a connecting bearing installed at the end of the bidirectional adjusting screw away from the bidirectional motor, and a controller installed on the left side of the rear end of the inner wall of the tester housing;

[0007] A current output terminal is inserted inside the voltage input jack, and a limit plate is installed on the outer surface of the current output terminal.

[0008] Preferably, the bidirectional adjusting screw is movably connected to the tester housing via a connecting bearing, and the bidirectional adjusting screw passes through the interior of the adjusting plate, and the bidirectional adjusting screw is threadedly connected to the adjusting plate.

[0009] Preferably, the limiting auxiliary rod is fixedly connected to the tester housing, and the auxiliary plate can move on the limiting auxiliary rod.

[0010] Preferably, the limiting half-cylinder has an L-shaped cross-section, and the diameter of the inside of the limiting half-cylinder matches the diameter of the voltage input socket, and the diameter of the limiting plate matches the diameter of the inside of the limiting half-cylinder.

[0011] Preferably, the tester switch is electrically connected to the controller, and the controller is electrically connected to the bidirectional motor, and the voltage input jack is electrically connected to the circuit resistance tester body.

[0012] Preferably, the tester housing further includes:

[0013] The lid is hinged to the top of the tester housing.

[0014] Preferably, the current output terminal is further provided with:

[0015] The measuring line is installed above the current output terminal.

[0016] Compared with the prior art, the present invention provides a loop resistance tester with the following advantages: the loop resistance tester transfers the voltage input socket on the main body of the loop resistance tester to the mounting plate, and then uses a bidirectional motor to drive the bidirectional adjusting screw to rotate, pushing the two limiting half cylinders to close together and wrap the voltage input socket and the limiting plate together. This avoids the current output terminal being accidentally knocked off when the main body of the loop resistance tester is working. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a top view of the mounting plate structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of the limiting semi-cylinder of this utility model.

[0020] In the diagram: 1. Tester housing; 2. Limiting auxiliary rod; 3. Current output terminal; 4. Mounting plate; 5. Voltage input socket; 6. Limiting half cylinder; 7. Controller; 8. Measuring wire; 9. Cover; 10. Loop resistance tester body; 11. Tester switch; 12. Connecting bearing; 13. Adjusting plate; 14. Bidirectional adjusting screw; 15. Bidirectional motor; 16. Auxiliary plate; 17. Limiting plate. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-3A loop resistance tester includes a tester housing 1, inside which a loop resistance tester body 10 is installed; a cover 9, hinged to the top of the tester housing 1; a tester switch 11 is located on the top of the loop resistance tester body 10; a mounting plate 4 is installed on the left side of the loop resistance tester body 10; voltage input sockets 5 are installed at both ends of the top of the mounting plate 4; a limiting half-cylinder 6 is installed at the front and rear ends of the voltage input sockets 5; an auxiliary plate 16 is installed on the right side of the limiting half-cylinder 6; and a through-hole is provided inside the auxiliary plate 16. Limiting auxiliary rod 2; the limiting auxiliary rod 2 is fixedly connected to the tester housing 1, and the auxiliary plate 16 can move on the limiting auxiliary rod 2. An adjusting plate 13 is fixedly installed on the left side of the limiting half cylinder 6. A bidirectional motor 15 is installed on the upper middle left side of the mounting plate 4. A bidirectional adjusting screw 14 is installed at the output end of the bidirectional motor 15. A connecting bearing 12 is installed at the end of the bidirectional adjusting screw 14 away from the bidirectional motor 15. The bidirectional adjusting screw 14 is movably connected to the tester housing 1 through the connecting bearing 12, and the bidirectional adjusting screw 14 passes through the adjusting plate 13. Inside the tester housing 1, the bidirectional adjusting screw 14 is threadedly connected to the adjusting plate 13. A controller 7 is installed on the left rear end of the inner wall of the tester housing 1. The tester switch 11 is electrically connected to the controller 7, and the controller 7 is electrically connected to the bidirectional motor 15. The voltage input socket 5 is electrically connected to the circuit resistance tester body 10. The current output terminal 3 passes through the inside of the voltage input socket 5, and a limit plate 17 is installed on the outer surface of the current output terminal 3. The limit semi-cylinder 6 has an L-shaped cross-section, and the internal diameter of the limit semi-cylinder 6 is related to the voltage output... The diameter of the insertion hole 5 matches, and the diameter of the limiting plate 17 matches the inner diameter of the limiting half-cylinder 6; by transferring the voltage input hole 5 on the circuit resistance tester body 10 to the mounting plate 4, and then using the bidirectional motor 15 to drive the bidirectional adjusting screw 14 to rotate, the two limiting half-cylinders 6 are pushed to close together to wrap the voltage input hole 5 and the limiting plate 17 together, thus preventing the current output terminal 3 from being accidentally knocked off when the circuit resistance tester body 10 is working; the measuring wire 8 is installed above the current output terminal 3.

[0023] Working Principle: When using this loop resistance tester, first open the cover 9 on the tester housing 1, insert the current output terminal 3 into the voltage input socket 5 on the mounting plate 4, and then clamp the other end of the measuring wire 8 onto the object to be tested. After connecting all the measuring wires 8, start the loop resistance tester body 10 through the tester switch 11 and simultaneously send a start signal to the controller 7. The controller 7 controls the bidirectional motor 15 to work, driving the bidirectional adjusting screw 14 to rotate a certain angle, pushing the two adjusting plates 13 to move closer together, thereby driving the two limit half-cylinders 6 to move closer together and close together, thus transmitting the voltage. The circuit resistance tester 10 is surrounded by the insertion hole 5 and the limiting plate 17, which prevents the current output terminal 3 from accidentally falling out of the voltage input hole 5 during the operation of the circuit resistance tester body 10. Then, the circuit resistance tester body 10 can be operated to perform the test. After the test is completed, the circuit resistance tester body 10 is turned off by the tester switch 11, and at the same time, a signal to the controller 7 is sent to end the operation. The controller 7 will then control the bidirectional adjusting screw 14 to rotate in the opposite direction by a certain angle, so that the two limiting half cylinders 6 are separated, making it easy to pull out the current output terminal 3 from the voltage input hole 5. This is the working principle of the circuit resistance tester.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A loop resistance tester, characterized in that, include: The tester housing (1) contains a loop resistance tester body (10). A tester switch (11) is located above the loop resistance tester body (10). A mounting plate (4) is mounted on the left side of the loop resistance tester body (10). Voltage input sockets (5) are mounted at both ends of the mounting plate (4). Limiting half-cylinders (6) are mounted at the front and rear ends of the voltage input sockets (5). An auxiliary plate (6) is mounted on the right side of the limiting half-cylinders (6). 16), a limiting auxiliary rod (2) is inserted inside the auxiliary plate (16), an adjusting plate (13) is fixedly installed on the left side of the limiting half cylinder (6), a bidirectional motor (15) is installed on the upper middle left side of the mounting plate (4), a bidirectional adjusting screw (14) is installed at the output end of the bidirectional motor (15), a connecting bearing (12) is installed at the end of the bidirectional adjusting screw (14) away from the bidirectional motor (15), and a controller (7) is installed on the left side of the rear end of the inner wall of the tester housing (1); A current output terminal (3) is inserted inside the voltage input socket (5), and a limit plate (17) is installed on the outer surface of the current output terminal (3).

2. The loop resistance tester according to claim 1, characterized in that, The bidirectional adjusting screw (14) is movably connected to the tester housing (1) via a connecting bearing (12), and the bidirectional adjusting screw (14) passes through the interior of the adjusting plate (13), and the bidirectional adjusting screw (14) is threadedly connected to the adjusting plate (13).

3. A loop resistance tester according to claim 1, characterized in that, The limiting auxiliary rod (2) is fixedly connected to the tester housing (1), and the auxiliary plate (16) moves on the limiting auxiliary rod (2).

4. A loop resistance tester according to claim 1, characterized in that, The limiting half-cylinder (6) has an L-shaped cross-section, and the diameter of the inside of the limiting half-cylinder (6) matches the diameter of the voltage input socket (5), and the diameter of the limiting plate (17) matches the diameter of the inside of the limiting half-cylinder (6).

5. A loop resistance tester according to claim 1, characterized in that, The tester switch (11) is electrically connected to the controller (7), and the controller (7) is electrically connected to the bidirectional motor (15). The voltage input jack (5) is electrically connected to the circuit resistance tester body (10).

6. A loop resistance tester according to claim 1, characterized in that, The tester housing (1) is also equipped with: The cover (9) is hinged above the tester housing (1).

7. A loop resistance tester according to claim 1, characterized in that, The current output terminal (3) is also provided with: The measuring line (8) is installed above the current output terminal (3).

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