A fast test device for contact resistance of DC contactor contacts

Abstract

The present invention provides a device for quickly testing the contact resistance of a DC contactor contact, which relates to the technical field of DC contactors and includes: an insulating docking cap, a conductive contact pin, an insulating movable plate, a conductive vertical rod, a reset spring, an insulating pressure arm, and an insulating transmission connecting rod; the insulating docking cap is connected to the top of the DC contactor, and two conductive contact pins are connected inside the insulating docking cap. Under the influence of the thrust of the reset spring, the insulating movable plate of the present invention drives the two conductive vertical rods downward synchronously, and the conductive vertical rod drives the conductive contact pins to move inward, so that the inner ends of the conductive contact pins are in close contact with the contacts of the DC contactor, and the contact resistance of the DC contactor contacts can be tested by a DC resistance tester. This solves the problem that the DC resistance tester is currently commonly used in combination with a power clamp to complete the test. Since the two contacts of the DC contactor are close to each other, the two power clamps are very likely to contact each other, resulting in power connection, which interferes with the test operation.

Description

Technical Field

[0001] The present invention relates to the technical field of DC contactors, in particular to a device for quickly testing the contact resistance of DC contactors. Background Art

[0002] As a key electrical component controlling the on / off switching of DC circuits, DC contactors utilize electromagnetic induction to drive mechanical contacts. They are equipped with specialized arc-extinguishing devices to safely interrupt DC arcs. Due to their reliable performance, these products have been widely used in high-end technology fields such as industrial automation control, new energy vehicle power systems, and large-scale energy storage devices. To ensure the quality and stability of DC contactors, their contact resistance must be rigorously tested after manufacturing. This precise resistance test effectively eliminates substandard products and prevents quality risks such as poor contact from entering the application stage.

[0003] Currently, the commonly used method for testing the contact resistance of DC contactors is to use a DC resistance tester in combination with power clamps to complete the test. This requires manual clamping of two power clamps onto the two contacts of the DC contactor. Since the two contacts of the DC contactor are closely spaced, the operating space left for the power clamps is very limited. During operation, the two power clamps can easily come into contact with each other, causing electrical connection, which in turn interferes with the test operation, making this method less than ideal in practical applications. Summary of the Invention

[0004] The present invention relates to a device for quickly testing the contact resistance of a DC contactor contact. The device solves the problem that a DC resistance tester is currently commonly used in combination with a power clamp to complete the test, and two power clamps need to be manually clamped onto two contacts of the DC contactor. Since the two contacts of the DC contactor are closely spaced, the operating space left for the power clamps is very limited. During operation, the two power clamps are very likely to contact each other, resulting in electrical connection, which in turn interferes with the test operation and results in unsatisfactory results in actual application.

[0005] According to a first aspect of the present invention, a device for quickly testing the contact resistance of a DC contactor contact is provided, which specifically includes: an insulating docking cap, a conductive contact pin, an insulating movable plate, a conductive vertical rod, a reset spring, an insulating pressure arm and an insulating transmission connecting rod; the insulating docking cap is connected to the top of the DC contactor, and two conductive contact pins are connected to the inside of the insulating docking cap; the top of the insulating docking cap is connected to an insulating movable plate, and conductive vertical rods are installed in both ends of the insulating movable plate, and the bottom of the conductive vertical rod is connected to the conductive contact pin, and the wire of the DC resistance tester is fixedly connected to the top of the conductive vertical rod by a bolt, and the conductive vertical rod is in contact with the outside of the insulating docking cap; two reset springs are installed on the top of the insulating docking cap, and the reset springs are located on the top of the insulating movable plate; two insulating pressure arms are connected to the outside of the insulating docking cap, and the outside of the insulating pressure arm is connected to the insulating transmission connecting rod, and the end of the insulating transmission connecting rod is connected to the insulating movable plate.

[0006] Furthermore, the insulating docking cap is symmetrically provided with docking slots, the notches of which face the bottom, and the two contacts of the DC contactor are inserted into the docking slots provided in the insulating docking cap.

[0007] Furthermore, the insulating docking cap is symmetrically provided with guide holes on the outside, which are connected to the docking slot. The conductive contact pin is slidably connected to the guide hole provided on the insulating docking cap, and the inner end of the conductive contact pin contacts the contact of the DC contactor.

[0008] Furthermore, guide columns are symmetrically arranged on the top of the insulating docking cap, and vertical guide holes are symmetrically arranged inside the insulating movable plate. The guide columns slide through the vertical guide holes provided in the insulating movable plate, and the sliding cooperation between the guide columns and the vertical guide holes plays a guiding effect on the up and down movement of the insulating movable plate.

[0009] Furthermore, the bottom end of the conductive vertical rod is bent, and a linkage inclined sliding hole is provided in the bottom end of the conductive vertical rod. The linkage inclined sliding hole is inclined at 45 degrees, and a linkage slider is provided in the outer end of the conductive contact pin. The linkage slider is slidably connected to the linkage inclined sliding hole provided in the conductive vertical rod.

[0010] Furthermore, vertical connecting holes are symmetrically provided inside the insulating movable plate, and the conductive vertical rod is fixed through the vertical connecting holes provided in the insulating movable plate by bolts. When the insulating movable plate drives the conductive vertical rod to move downward, the linkage slider moves from the bottom end to the top end of the linkage inclined sliding hole, driving the conductive contact pin to move inward. When the insulating movable plate drives the conductive vertical rod to move upward, the linkage slider moves from the top end to the bottom end of the linkage inclined sliding hole, driving the conductive contact pin to move outward.

[0011] Furthermore, the top of the guide column of the insulating docking cap is provided with a force-bearing cap head, and the reset spring is sleeved on the outside of the guide column. The top of the reset spring contacts the force-bearing cap head, and the bottom of the reset spring contacts the top side of the insulating movable plate. The reset spring applies a downward thrust to the insulating movable plate, which has the effect of elastically resetting the insulating movable plate. When the two contacts of the DC contactor are inserted into the docking slot, the insulating movable plate moves downward under the influence of the thrust of the reset spring, and the insulating movable plate drives the two conductive vertical rods downward synchronously, and the conductive vertical rod drives the conductive contact pin to move inward, so that the inner end of the conductive contact pin is in close contact with the contact of the DC contactor.

[0012] Furthermore, the bottom end of the insulating pressure arm is rotatably connected to the insulating docking cap, a vertical connecting rod is provided on the top of the insulating movable plate, one end of the insulating transmission connecting rod is rotatably connected to the vertical connecting rod provided on the insulating movable plate, and the other end of the insulating transmission connecting rod is rotatably connected to the insulating pressure arm. The insulating movable plate is connected to the two insulating pressure arms through the insulating transmission connecting rod. After the contact resistance test of the DC contactor contacts is completed, the fingers press the top ends of the two insulating pressure arms inward to drive the insulating pressure arms to rotate inward. The insulating pressure arms drive the insulating movable plate to move upward through the insulating transmission connecting rod. The insulating movable plate drives the two conductive vertical rods upward synchronously, and the conductive vertical rod drives the conductive contact pin to move outward, so that the inner end of the conductive contact pin and the contacts of the DC contactor are separated from each other.

[0013] The present invention provides a device for quickly testing the contact resistance of a DC contactor, which has the following beneficial effects:

[0014] When the present invention is in use, the guide column and the vertical guide hole adopt a sliding fit design, which can accurately guide the insulating movable plate to move up and down, ensuring the stability and accuracy of its movement trajectory; the reset spring applies a continuous downward thrust to the insulating movable plate, giving the insulating movable plate an elastic reset function, so that it can quickly return to its initial position after the force changes; when the two contacts of the DC contactor are inserted into the docking slot, under the action of the reset spring thrust, the insulating movable plate moves downward, and synchronously drives the two conductive vertical rods to move downward; the conductive vertical rod further drives the conductive contact pin to move inward, prompting the inner end of the conductive contact pin to fit closely with the contact of the DC contactor, effectively ensuring the stability of the conductive connection; in this state, the contact resistance of the DC contactor contacts can be directly tested using a DC resistance tester, and the entire operation process is quick and simple, which greatly improves the test efficiency.

[0015] In addition, after the contact resistance test of the DC contactor is completed, the operator presses the top ends of the two insulating pressure arms inward with his fingers, driving the insulating pressure arms to rotate inward. During the rotation process, the insulating pressure arms will transmit power to the insulating movable plate through the insulating transmission connecting rod connected to it, causing it to move upward; when the insulating movable plate moves upward, it will simultaneously drive the two conductive vertical rods to move upward together, and the upward movement of the conductive vertical rods will further drive the conductive contact pins to move outward, eventually separating the inner ends of the conductive contact pins from the contacts of the DC contactor, and the device can be easily removed from the top of the DC contactor; when the next DC contactor contact resistance test operation is required, just release the two insulating pressure arms pressed previously, and the insulating movable plate will drive the insulating pressure arms to rotate outward and reset through the insulating transmission connecting rod, and the conductive contact pins and the DC contactor contacts will be conductively connected again, and subsequent testing work can be carried out.

[0016] Other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0018] The drawings described below only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached figure:

[0020] Figure 1 The figure shows the overall top axis side structure diagram of the device for quickly testing the contact resistance of a DC contactor contact of the present application;

[0021] Figure 2 The figure shows the overall bottom axis side structure diagram of the device for quickly testing the contact resistance of a DC contactor of the present application;

[0022] Figure 3 A schematic diagram of the shaft-side structure of the device for quickly testing the contact resistance of a DC contactor contact of the present application is shown, with the conductive contact pin moving inward;

[0023] Figure 4 The figure shows the overall disassembled structure of the device for quickly testing the contact resistance of a DC contactor of the present application;

[0024] Figure 5 A schematic diagram of the separated structure of the insulating butt joint cap and the conductive contact pin of the DC contactor contact resistance rapid test device of the present application is shown;

[0025] Figure 6A schematic diagram of the connection structure between the insulating movable plate and the conductive vertical rod of the DC contactor contact resistance rapid test device of the present application is shown;

[0026] Figure 7 A schematic diagram of the shaft side structure of the insulating movable plate of the DC contactor contact resistance rapid test device of the present application is shown;

[0027] Figure 8 A schematic diagram of the conductive vertical rod axial side structure of the DC contactor contact resistance rapid test device of the present application is shown;

[0028] Figure 9 A schematic diagram of the connection structure between the insulating pressure arm and the insulating transmission connecting rod of the DC contactor contact resistance rapid test device of the present application is shown.

[0029] Reference numerals:

[0030] 1. Insulating docking cap; 101. Docking slot; 102. Guide jack; 103. Guide column; 1031. Force-bearing cap head;

[0031] 2. Conductive contact pin; 201. Linkage slider;

[0032] 3. Insulated movable plate; 301. Vertical guide hole; 302. Vertical connecting hole; 303. Vertical connecting rod;

[0033] 4. Conductive vertical rod; 401. Linked inclined sliding hole;

[0034] 5. Return spring;

[0035] 6. Insulated pressure arm;

[0036] 7. Insulated transmission connecting rod. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Please refer to Figures 1 to 9 :Example 1:

[0039] The present invention proposes a device for quickly testing the contact resistance of a DC contactor contact, comprising: an insulating butt joint cap 1, a conductive contact pin 2, an insulating movable plate 3, a conductive vertical rod 4, a reset spring 5, an insulating pressure arm 6 and an insulating transmission connecting rod 7; the insulating butt joint cap 1 is connected to the top of the DC contactor, and two conductive contact pins 2 are connected to the inside of the insulating butt joint cap 1; the top of the insulating butt joint cap 1 is connected to the insulating movable plate 3, and conductive vertical rods 4 are installed in both ends of the insulating movable plate 3, and the bottom of the conductive vertical rod 4 is connected to the conductive contact pin 2, and the lead of the DC resistance tester is fixedly connected to the top of the conductive vertical rod 4 by a bolt, and the conductive vertical rod 4 is in contact with the outside of the insulating butt joint cap 1; two reset springs 5 ​​are installed on the top of the insulating butt joint cap 1, and the reset springs 5 ​​are installed on the top of the insulating butt joint cap 1. The positioning spring 5 is located at the top of the insulating movable plate 3; the outside of the insulating docking cap 1 is connected to two insulating pressure arms 6, and the outside of the insulating pressure arms 6 is connected to an insulating transmission connecting rod 7, and the end of the insulating transmission connecting rod 7 is connected to the insulating movable plate 3; the inside of the insulating docking cap 1 is symmetrically provided with docking slots 101, and the notch of the docking slots 101 is facing the bottom, and the two contacts of the DC contactor are inserted into the docking slots 101 provided in the insulating docking cap 1; the outside of the insulating docking cap 1 is symmetrically provided with guide sockets 102, and the guide sockets 102 are connected to the docking slots 101, and the conductive contact pin 2 is slidably connected to the guide sockets 102 provided in the insulating docking cap 1, and the inner end of the conductive contact pin 2 is in contact with the contact of the DC contactor.

[0040] In this embodiment, the top of the insulating docking cap 1 is symmetrically provided with guide posts 103, and the interior of the insulating movable plate 3 is symmetrically provided with vertical guide holes 301. The guide posts 103 slide through the vertical guide holes 301 provided on the insulating movable plate 3.

[0041] By adopting the above technical solution, the guide pillars 103 and the vertical guide holes 301 are slidably matched to guide the insulating movable plate 3 to move up and down.

[0042] In this embodiment, the bottom end of the conductive vertical rod 4 is bent, and a linkage inclined sliding hole 401 is provided in the bottom end of the conductive vertical rod 4. The linkage inclined sliding hole 401 is inclined at 45 degrees. A linkage slider 201 is provided in the outer end of the conductive contact pin 2. The linkage slider 201 is slidably connected to the linkage inclined sliding hole 401 provided in the conductive vertical rod 4.

[0043] In this embodiment, vertical connecting holes 302 are symmetrically provided inside the insulating movable plate 3, and the conductive vertical rod 4 is fixed by bolts and passes through the vertical connecting hole 302 provided on the insulating movable plate 3. When the insulating movable plate 3 drives the conductive vertical rod 4 to move downward, the linkage slider 201 moves from the bottom end to the top end of the linkage inclined sliding hole 401, driving the conductive contact pin 2 to move inward. When the insulating movable plate 3 drives the conductive vertical rod 4 to move upward, the linkage slider 201 moves from the top end to the bottom end of the linkage inclined sliding hole 401, driving the conductive contact pin 2 to move outward.

[0044] In this embodiment, a force-bearing cap head 1031 is provided at the top of the guide column 103 provided on the insulating docking cap 1, and a return spring 5 is sleeved on the outside of the guide column 103. The top end of the return spring 5 contacts the force-bearing cap head 1031, and the bottom end of the return spring 5 contacts the top side of the insulating movable plate 3;

[0045] By adopting the above technical solution, a downward thrust is applied to the insulating movable plate 3 through the reset spring 5, which has the effect of elastically resetting the insulating movable plate 3; when the two contacts of the DC contactor are inserted into the docking slot 101, the insulating movable plate 3 moves downward under the influence of the thrust of the reset spring 5, and the insulating movable plate 3 drives the two conductive vertical rods 4 downward synchronously, and the conductive vertical rods 4 drive the conductive contact pin 2 to move inward, so that the inner end of the conductive contact pin 2 is in close contact with the contact of the DC contactor, ensuring the stability of the conductive connection. The contact resistance of the DC contactor can be tested by a DC resistance tester, and the process is faster and simpler.

[0046] Embodiment 2, on the basis of embodiment 1, the bottom end of the insulating pressure arm 6 is rotatably connected to the insulating docking cap 1, a vertical connecting rod 303 is provided on the top of the insulating movable plate 3, one end of the insulating transmission connecting rod 7 is rotatably connected to the vertical connecting rod 303 provided on the insulating movable plate 3, and the other end of the insulating transmission connecting rod 7 is rotatably connected to the insulating pressure arm 6, and the insulating movable plate 3 is connected to the two insulating pressure arms 6 through the insulating transmission connecting rod 7;

[0047] By adopting the above technical solution, after the contact resistance test of the DC contactor contacts is completed, press the top of the two insulating pressure arms 6 inward with your fingers, driving the insulating pressure arms 6 to rotate inward, and the insulating pressure arms 6 drive the insulating movable plate 3 to move upward through the insulating transmission connecting rod 7. The insulating movable plate 3 drives the two conductive vertical rods 4 upward synchronously, and the conductive vertical rod 4 drives the conductive contact pin 2 to move outward, so that the inner end of the conductive contact pin 2 and the contact of the DC contactor are separated from each other, and the device can be separated from the top of the DC contactor; when performing the next DC contactor contact resistance test operation, release the two insulating pressure arms 6, and the insulating movable plate 3 drives the insulating pressure arm 6 to rotate outward and reset through the insulating transmission connecting rod 7, thereby achieving the conductive connection test effect.

[0048] The working principle of this embodiment is: first, press the top of the two insulating pressure arms 6 inward with your fingers, driving the insulating pressure arms 6 to rotate inward, and the insulating pressure arms 6 drive the insulating movable plate 3 to move upward through the insulating transmission connecting rod 7, and the insulating movable plate 3 drives the two conductive vertical rods 4 upward synchronously, and the conductive vertical rod 4 drives the conductive contact pin 2 to move outward, so that the inner end of the conductive contact pin 2 is completely retracted into the guide socket 102; next, insert the two contacts of the DC contactor into the docking slot 101, loosen the two insulating pressure arms 6, and the insulating movable plate 3 moves downward under the thrust of the reset spring 5, and the insulating movable plate 3 drives the two conductive vertical rods 4 downward synchronously, and the conductive vertical rod 4 drives the conductive contact pin 2 to move inward, so that the inner end of the conductive contact pin 2 is in close contact with the contact of the DC contactor, ensuring the stability of the conductive connection, and the contact resistance of the DC contactor can be tested by a DC resistance tester; while the reset spring 5 pushes the insulating movable plate 3 to move downward, the insulating movable plate 3 drives the insulating pressure arm 6 to rotate outward through the insulating transmission connecting rod 7 to achieve reset.

[0049] In this article, there are several points to note:

[0050] 1. The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures can refer to the general design.

[0051] 2. In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to form new embodiments.

[0052] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A device for quickly testing the contact resistance of a DC contactor, comprising: An insulating butt joint cap (1), a conductive contact pin (2), an insulating movable plate (3), a conductive vertical rod (4), a reset spring (5), an insulating pressure arm (6) and an insulating transmission connecting rod (7); characterized in that the insulating butt joint cap (1) is connected to the top of the DC contactor, and two conductive contact pins (2) are connected to the inside of the insulating butt joint cap (1); the top of the insulating butt joint cap (1) is connected to the insulating movable plate (3), and conductive vertical rods (4) are installed in both ends of the insulating movable plate (3), and the bottom of the conductive vertical rod (4) is connected to the conductive contact pin (2), and the lead of the DC resistance tester is fixedly connected to the top of the conductive vertical rod (4) by bolts, and the conductive vertical rod (4) contacts the outside of the insulating butt joint cap (1); two reset springs (5) are installed on the top of the insulating butt joint cap (1), and the reset springs (5) are located on the top of the insulating movable plate (3); the outside of the insulating butt joint cap (1) is connected to two insulating pressure arms (6), and the outside of the insulating pressure arm (6) is connected to the insulating transmission connecting rod (7), and the end of the insulating transmission connecting rod (7) is connected to the insulating movable plate (3); The bottom end of the conductive vertical rod (4) is bent, and a linkage oblique sliding hole (401) is provided in the bottom end of the conductive vertical rod (4), and the linkage oblique sliding hole (401) is inclined at 45 degrees. A linkage slider (201) is provided in the outer end of the conductive contact pin (2), and the linkage slider (201) is slidably connected to the linkage oblique sliding hole (401) provided in the conductive vertical rod (4); The insulating movable plate (3) is symmetrically provided with vertical connection holes (302) inside, and the conductive vertical rod (4) is fixed through the vertical connection hole (302) provided in the insulating movable plate (3) by means of bolts. When the insulating movable plate (3) drives the conductive vertical rod (4) to move downward, the linkage slider (201) moves from the bottom end to the top end of the linkage oblique sliding hole (401), driving the conductive contact pin (2) to move inward. When the insulating movable plate (3) drives the conductive vertical rod (4) to move upward, the linkage slider (201) moves from the top end to the bottom end of the linkage oblique sliding hole (401), driving the conductive contact pin (2) to move outward.

2. A DC contactor contact resistance rapid test device according to claim 1, characterized in that: The insulating docking cap (1) is symmetrically provided with docking slots (101), with the notches of the docking slots (101) facing the bottom, and the two contacts of the DC contactor are plugged into the docking slots (101) provided in the insulating docking cap (1).

3. A DC contactor contact resistance rapid test device according to claim 2, characterized in that: The insulating docking cap (1) is symmetrically provided with a guide socket (102) on the outside, the guide socket (102) is connected to the docking slot (101), the conductive contact pin (2) is slidably connected to the guide socket (102) provided on the insulating docking cap (1), and the inner end of the conductive contact pin (2) is in contact with the contact of the DC contactor.

4. A DC contactor contact resistance rapid test device according to claim 1, characterized in that: The insulating butt joint cap (1) is symmetrically provided with guide columns (103) on the top, and the insulating movable plate (3) is symmetrically provided with vertical guide holes (301) inside. The guide columns (103) slide through the vertical guide holes (301) provided on the insulating movable plate (3).

5. A device for quickly testing the contact resistance of a DC contactor according to claim 4, characterized in that: The top of the guide column (103) provided in the insulating docking cap (1) is provided with a force-bearing cap head (1031), and the return spring (5) is sleeved on the outside of the guide column (103). The top of the return spring (5) contacts the force-bearing cap head (1031), and the bottom of the return spring (5) contacts the top side of the insulating movable plate (3).

6. A device for quickly testing the contact resistance of a DC contactor according to claim 1, characterized in that: The bottom end of the insulating pressure arm (6) is rotatably connected to the insulating docking cap (1); a vertical connecting rod (303) is provided on the top of the insulating movable plate (3); one end of the insulating transmission connecting rod (7) is rotatably connected to the vertical connecting rod (303) provided on the insulating movable plate (3); the other end of the insulating transmission connecting rod (7) is rotatably connected to the insulating pressure arm (6); and the insulating movable plate (3) is connected to the two insulating pressure arms (6) via the insulating transmission connecting rod (7).

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