Clamping mechanism and direct current resistance tester

Abstract

The utility model relates to the technical field of resistance testers, and specifically discloses a clamping mechanism and a direct current resistance tester, comprising a clamping unit, a clamping plate 1, a clamping plate 2 arranged on one side of the clamping plate, and a fixing assembly arranged between the clamping plate 1 and the clamping plate 2; the connecting unit comprises a connecting base arranged on the second clamping plate and a hinge assembly arranged on the connecting base. And the fastening unit comprises a mounting base arranged on the second clamping plate and a fastening assembly arranged on the mounting base. The clamping mechanism solves the problems that when a bolt and a nut are used for fixing a wire clamp, the process is complex, and an auxiliary tool needs to be used. Meanwhile, the direct-current resistance tester solves the problems of complexity, low efficiency, data fluctuation and potential safety hazards of a transformer direct-current resistance tester.

Description

Technical Field

[0001] The utility model relates to the technical field of resistance testers, in particular to a clamping mechanism and a DC resistance tester. Background Art

[0002] The DC resistance tester is a high-precision instrument specially used to measure the DC resistance of transformer windings and high-power inductive equipment.

[0003] During use, first ensure that the transformer is powered off and safely grounded, then select the appropriate measuring current range, connect the test lead of the measuring instrument to the transformer winding terminal through the wire clamp, and fix the wire clamp to the transformer winding with bolts, nuts and clamping plates. Start the measuring instrument to automatically calculate and display the resistance value, record the measurement results and compare and analyze them with the standard value. After the measurement is completed, safely disconnect and store or output the data.

[0004] The use of bolts and nuts requires additional tools to remove and re-tighten the clamps, making regular maintenance and inspection of the clamps cumbersome. Furthermore, measuring the DC resistance of large split-phase transformers presents significant challenges due to the complex distribution of winding leads, the inefficiency and unstable data of traditional methods, and the safety risks posed by testers. Utility Model Content

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and in the abstract and title of the utility model to avoid obscuring the purpose of this section, the abstract and the title of the utility model, and such simplifications or omissions shall not be used to limit the scope of the present invention.

[0006] In view of the problem in the above-mentioned prior art that when fixing the wire clamp using bolts and nuts, the process is complicated and auxiliary tools need to be used, the present utility model is proposed.

[0007] Therefore, the purpose of the present invention is to provide a clamping mechanism, which aims to solve the problem that when fixing the wire clamp using bolts and nuts, the process is complicated and auxiliary tools need to be used.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a clamping mechanism, comprising:

[0009] The clamping unit includes a first clamping plate, a second clamping plate disposed on one side of the clamping plate, and a fixing assembly disposed between the first clamping plate and the second clamping plate;

[0010] A connecting unit, comprising a connecting seat provided on the second clamping plate, and a hinge assembly provided on the connecting seat; and

[0011] The fastening unit includes a mounting base arranged on the second clamping plate and a fastening assembly arranged on the mounting base.

[0012] As a preferred solution of the clamping mechanism described in the present invention, the fixing component includes an elastic strip 1 arranged on the clamping plate 1, a fixing plate arranged on the elastic strip 1, a fixing tooth arranged on the fixing plate, and an elastic strip 2 arranged on the fixing plate.

[0013] As a preferred solution of the clamping mechanism described in the present invention, the hinge assembly includes a hinge rod arranged on the connecting seat, a fixed axis arranged on the hinge rod, and a hinge seat arranged on the fixed axis.

[0014] As a preferred solution of the clamping mechanism of the present invention, the fastening assembly includes a support base provided on one side of the mounting base, a positioning post provided on the support base, a connecting plate provided on the positioning post, and a return spring provided on the positioning post;

[0015] The return spring is arranged between the support base and the connecting plate.

[0016] As a preferred solution of the clamping mechanism described in the utility model, the fastening assembly further includes a clamping block arranged on the positioning column, a positioning groove 1 arranged on the mounting base, a torsion block arranged on the connecting plate, and a positioning groove 2 arranged on one side of the positioning groove 1.

[0017] The beneficial effects of the present invention are as follows: by using a fixing assembly, a connecting unit, and a fastening unit, the reliance on auxiliary tools can be reduced, and the process of fixing the wire clamp can be simplified, thereby solving the problem that the process of fixing the wire clamp with bolts and nuts is complicated and requires the use of auxiliary tools.

[0018] In view of the complexity, low efficiency, data fluctuation and potential safety hazards of the transformer DC resistance measuring instrument in the above-mentioned prior art, the present utility model is proposed.

[0019] Therefore, the purpose of the present invention is to provide a DC resistance tester, which aims to solve the problems of complexity, low efficiency, data fluctuation and safety hazards of transformer DC resistance measuring instruments.

[0020] As a preferred solution of the DC resistance tester described in the utility model, wherein: a DC resistance tester further includes:

[0021] A transmission unit, comprising a lead wire disposed on the fixing component, a transmission component 1 disposed at one end of the lead wire, and a transmission component 2 disposed at one side of the transmission component 1; and

[0022] The measuring unit includes a measuring instrument body arranged on the transmission component 1, a power supply component arranged on the measuring instrument body, and a terminal component arranged on the measuring instrument body.

[0023] As a preferred solution of the DC resistance tester of the present invention, the transmission component 1 includes a fixed base 1 provided on the measuring instrument body, a fixed sleeve 1 provided on the fixed base 1, and a socket 1 provided on the fixed sleeve 1;

[0024] A groove is provided on the measuring instrument body, and an energizing column is provided on the groove.

[0025] As a preferred solution of the DC resistance tester of the present invention, the second transmission component includes a second fixed base provided on the measuring instrument body, a second fixed sleeve provided on the second fixed base, and a second socket provided on the second fixed sleeve;

[0026] A communication antenna is provided on the measuring instrument body, and an instrument touch screen is provided on one side of the communication antenna.

[0027] As a preferred solution of the DC resistance tester described in the present invention, the power supply component includes a fixed base three arranged on the measuring instrument body, and a button arranged on the fixed base three.

[0028] As a preferred solution of the DC resistance tester described in the present invention, the terminal assembly includes a fixed base four arranged on the measuring instrument body, and a ground terminal arranged on the fixed base four.

[0029] The beneficial effects of this utility model are: testers only need to operate one device to complete the DC resistance measurement of the entire transformer, significantly improving work efficiency. The device is placed between the high-voltage and low-voltage winding lead equipment on the transformer, ensuring high test efficiency and data stability. It solves the problems of complexity, inefficiency, data fluctuation, and safety hazards associated with transformer DC resistance measuring instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. Among them:

[0031] Figure 1 This is a schematic diagram of the overall structure of a clamping mechanism of the present utility model.

[0032] Figure 2 It is a schematic diagram of the planar structure of a clamping mechanism of the present utility model.

[0033] Figure 3 This is a cross-sectional view of a fastening component of a clamping mechanism of the present invention.

[0034] Figure 4 The figure is a schematic diagram of the overall structure of a DC resistance tester of the present utility model.

[0035] Figure 5 The utility model is a schematic diagram of the main structure of a DC resistance tester measuring instrument.

[0036] Figure 6 This is a wiring diagram for measuring AC / AC phase DC resistance of a DC resistance tester of the present invention.

[0037] Figure 7 This is a wiring diagram for measuring BC / BC phase DC resistance of a DC resistance tester of the utility model.

[0038] Figure 8 This is a wiring diagram for measuring AB / ab phase DC resistance of a DC resistance tester of the utility model. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing embodiments of the present invention, cross-sectional views of device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, three-dimensional dimensions, including length, width, and depth, should be included.

[0043] Example 1

[0044] Reference Figure 1-Figure 2 , which is the first embodiment of the present utility model, provides a clamping mechanism, which includes:

[0045] The clamping unit 100 includes a clamping plate 101, a clamping plate 102 arranged on the side of the clamping plate 101, and a fixing component 103 arranged between the clamping plate 101 and the clamping plate 102; the clamping plate 101 and the clamping plate 102 are used to clamp and fix the surface of the object.

[0046] The connecting unit 200 includes a connecting base 201 disposed on the second clamping plate 102 and a hinge assembly 202 disposed on the connecting base 201; and the fastening unit 300 includes a mounting base 301 disposed on the second clamping plate 102 and a fastening assembly 302 disposed on the mounting base 301. The hinge assembly 202 is used to connect the first clamping plate 101 and the second clamping plate 102, and is used to support the opening and closing of the first clamping plate 101 and the second clamping plate 102. The fastening assembly 302 replaces the bolt and nut fixing method with a rotating downward pressing fastening method, so that the fixing between the first clamping plate 101 and the second clamping plate 102 can be fixed without the use of additional auxiliary tools, reducing cumbersome steps and simplifying the fixing method between the first clamping plate 101 and the second clamping plate 102.

[0047] The fastening assembly 302 includes a support base 302a mounted on one side of the mounting base 301, a positioning post 302b mounted on the support base 302a, a connecting plate 302c mounted on the positioning post 302b, and a return spring 302d mounted on the positioning post 302b. The return spring 302d is positioned between the support base 302a and the connecting plate 302c. The support base 302a is mounted on the mounting base 301, and the cross-sectional areas of the support base 302a and the mounting base 301 are equal, allowing the support base 302a to better fit the surface of the mounting base 301. The connecting plate 302c is used to connect the positioning column 302b and the torsion block 302g. The two ends of the return spring 302d are movably connected to the connecting plate 302c and the support seat respectively. The return spring 302d is pressed while the torsion block 302g is rotated to move the positioning column 302b downward in the tracking direction, and one end of the positioning column 302b is fixed in the mounting base 301, thereby fixing the clamping plate 101 on the clamping plate 2 102.

[0048] The fastening assembly 302 further includes a clamping block 302e disposed on the positioning post 302b, a positioning slot 1 302f disposed on the mounting base 301, a twisting block 302g disposed on the connecting plate 302c, and a positioning slot 2 302h disposed to one side of the positioning slot 1 302f. By securing the clamping block 302e in either the positioning slot 1 302f or the positioning slot 2 302h, the positioning post 302b can be secured to the mounting base 301.

[0049] During use, the operator places the cylindrical object between clamping plate 101 and clamping plate 2 102. After closing, the distance between clamping plate 101 and clamping plate 2 102 should be greater than the diameter of the object, so that clamping plate 101 and clamping plate 2 102 can adapt to cylindrical objects of different diameters.

[0050] When the operator wants to keep the clamping plate 101 and the clamping plate 2 102 always fixed at a fixed point on the surface of the object, the block 302e at one end of the positioning column 302b can be positioned in the positioning groove 1 302f. When the operator wants to keep the clamping plate 101 and the clamping plate 2 102 always fixed at a fixed point on the surface of the object, the block 302e at one end of the positioning column 302b can be positioned in the positioning groove 2 302h.

[0051] The tightening action between the clamping plate 101 and the clamping plate 2 102 is completed through a single rotation and downward pressure action, reducing the need for multiple steps and making the entire process smoother. Since no additional tools are required, the operator's maintenance and inspection of the clamping mechanism becomes simpler.

[0052] Example 2

[0053] Reference Figure 1 - Figure 3 , which is the second embodiment of the present utility model. This embodiment is different from the first embodiment in that: the fixing assembly 103 includes an elastic strip 103a provided on the clamping plate 101, a fixing plate 103b provided on the elastic strip 103a, a fixing tooth 103c provided on the fixing plate 103b, and an elastic strip 2 103d provided on the fixing plate 103b. Elastic strip 103a and elastic strip 2 103d are used to fix and support the fixing plate 103b on the clamping plate 101 and the clamping plate 2 102. The distance between the clamping plate 101 and the clamping plate 2 102 after closing is greater than the diameter of the object. The fixing plate 103b is used to fix the object between the clamping plate 101 and the clamping plate 2 102 to prevent the object between the clamping plate 101 and the clamping plate 2 102 from shifting. The fixing teeth 103c on the fixing plate 103b increase the friction of the fixing plate 103b on the surface of the object.

[0054] Compared to Example 1, the hinge assembly 202 further comprises a hinge rod 202a disposed on the connecting base 201, a fixed shaft 202b disposed on the hinge rod 202a, and a hinge base 202c disposed on the fixed shaft 202b. The entire hinge assembly 202 is used to securely support the opening and closing of the first clamping plate 101 on the second clamping plate 102. When the first clamping plate 101 is opened and closed, the fixed shaft 202b, the hinge rod 202a, and the hinge base 202c are used to securely support the first clamping plate 101 at a certain angle on the second clamping plate 102.

[0055] During use, with the support of the hinge assembly 202, the clamping plate 101 opens and closes on the clamping plate 2 102. When the clamping plate 101 is closed on the clamping plate 2 102, the fixing plates 103b on the clamping plate 101 and the clamping plate 2 102 act on the surface of the object.

[0056] By fixing the object through the fixing plate 103b and the support of the hinge assembly 202, the opening and closing of the clamping plate becomes simple, reducing the complicated steps of using bolts and nuts, significantly improving the speed and efficiency of the clamping mechanism in fixing the object, and the fixing teeth 103c on the fixing plate 103b increase the friction between the fixing plate 103b and the object. The fixing teeth 103c on the fixing plate 103b increase the friction with the contact surface of the object, thereby improving the stability and reliability of the clamping.

[0057] The remaining structures are the same as those of Example 1.

[0058] Example 3

[0059] Reference Figure 1 - Figure 6 , which is the third embodiment of the present utility model, is different from the second embodiment in that: a DC resistance tester further includes,

[0060] The transmission unit 400 includes a lead 401 mounted on the fixing assembly 103, a transmission assembly 1 402 mounted on one end of the lead 401, and a transmission assembly 2 403 mounted on one side of the transmission assembly 1 402. Furthermore, the measuring unit 500 includes a measuring instrument body 501 mounted on the transmission assembly 1 402, a power supply assembly 502 mounted on the measuring instrument body 501, and a terminal assembly 503 mounted on the measuring instrument body 501. The transmission assembly 1 402 and the transmission assembly 2 403 are used to transmit data detected by the clamping mechanism to the measuring instrument body 501.

[0061] Compared to Example 2, the transmission component 402 further comprises a fixed base 402a disposed on the measuring instrument body 501, a fixed sleeve 402b disposed on the fixed base 402a, and a socket 402c disposed on the fixed sleeve 402b. The measuring instrument body 501 is provided with a groove 504, and a power supply pin 505 is disposed on the groove 504. An external power supply is inserted into the groove 504, where it contacts the power supply pin 505 to energize the measuring instrument body 501. By inserting the lead 401 into the socket 402c, when the operator connects the lead 401 to one end of the clamping mechanism, the socket secures the lead 401, ensuring its connection to the transmission component 402. This connection allows the detected data to be smoothly transmitted to the measuring instrument body 501 for further processing and analysis.

[0062] Furthermore, the second transmission component 403 includes a second fixed base 403a mounted on the measuring instrument body 501, a second fixed sleeve 403b mounted on the second fixed base 403a, and a second socket 403c mounted on the second fixed sleeve 403b. A communication antenna 506 is mounted on the measuring instrument body 501, and an instrument touch screen 507 is mounted on one side of the communication antenna 506. By inserting the lead 401 into the second socket 403c, when the operator connects the lead 401 to one end of the clamping mechanism, the socket secures the lead 401, ensuring its connection to the second transmission component 403. This connection allows the detected data to be smoothly transmitted to the measuring instrument body 501 for further processing and analysis.

[0063] The power supply assembly 502 includes a fixed base 502a disposed on the measuring instrument body 501 and a button 502b disposed on the fixed base 502a. Pressing the button 502b on the power supply assembly 502 can turn on the measuring instrument body 501.

[0064] The terminal assembly 503 includes a fixed base 503a mounted on the measuring instrument body 501, and a ground terminal 503b mounted on the fixed base 503a. Ground terminal 503b provides a ground path for the DC resistance measuring instrument. In the event of an electrical fault, ground terminal 503b quickly directs the current to the ground, preventing electric shock and ensuring operator safety.

[0065] During use, before testing begins, the tester places measurement equipment on the high-voltage and low-voltage sides of the transformer, respectively. Test leads are used to connect the test instrument's terminals to the transformer's winding leads 401. Antenna technology is also used to establish a wireless communication link between the two measurement devices. When measuring AC / ac phase DC resistance, the instrument automatically shorts the high-voltage side BC phase lead 401 internally. When measuring AB / ab phase DC resistance, the instrument automatically shorts the high-voltage side AB phase lead 401 internally. When measuring BC / bc phase DC resistance, the instrument automatically shorts the high-voltage side AC phase lead 401 internally.

[0066] During the test, the tester only needs to control one device, such as the low-voltage device. This device sends a measurement command to the high-voltage device, triggering the high-voltage measurement process. Once the high-voltage device successfully receives the command, it immediately sends a "ready" signal back to the low-voltage device, indicating that it is ready for measurement.

[0067] Upon receiving the "Ready" signal, the low-voltage device initiates the delayed start command process. After the preset delay, both devices simultaneously inject current into the transformer windings. The low-voltage device simultaneously displays the high- and low-voltage side currents, as well as the real-time DC resistance values. During measurement, the device dynamically adjusts output current based on real-time feedback to ensure accurate measurement data. Finally, all measurement results are aggregated and displayed on the operating device.

[0068] In summary, testers only need to operate a single device to complete the DC resistance measurement of the entire transformer, significantly improving work efficiency. The device automatically adjusts the output current direction to accommodate DC resistance measurements with different phase sequences. By simultaneously inputting current to both the high and low voltage sides, the excitation process is accelerated, shortening measurement time and improving data accuracy.

[0069] The remaining structures are the same as those of Example 2.

[0070] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. A clamping mechanism, characterized in that: include, A clamping unit (100) includes a clamping plate (101), a clamping plate (102) disposed on one side of the clamping plate (101), and a fixing assembly (103) disposed between the clamping plate (101) and the clamping plate (102); The connecting unit (200) comprises a connecting seat (201) provided on the second clamping plate (102), and a hinge assembly (202) provided on the connecting seat (201); and The fastening unit (300) comprises a mounting base (301) arranged on the second clamping plate (102), and a fastening assembly (302) arranged on the mounting base (301).

2. The clamping mechanism according to claim 1, wherein: The fixing assembly (103) includes an elastic strip 1 (103a) arranged on the clamping plate 1 (101), a fixing plate (103b) arranged on the elastic strip 1 (103a), a fixing tooth (103c) arranged on the fixing plate (103b), and an elastic strip 2 (103d) arranged on the fixing plate (103b).

3. The clamping mechanism according to claim 2, wherein: The hinge assembly (202) comprises a hinge rod (202a) arranged on the connecting seat (201), a fixed shaft (202b) arranged on the hinge rod (202a), and a hinge seat (202c) arranged on the fixed shaft (202b).

4. The clamping mechanism according to claim 3, characterized in that: The fastening assembly (302) comprises a support base (302a) provided on one side of the mounting base (301), a positioning column (302b) provided on the support base (302a), a connecting plate (302c) provided on the positioning column (302b), and a return spring (302d) provided on the positioning column (302b); The return spring (302d) is arranged between the support base (302a) and the connecting plate (302c).

5. The clamping mechanism according to claim 4, characterized in that: The fastening assembly (302) further includes a clamping block (302e) provided on the positioning column (302b), a positioning groove 1 (302f) provided on the mounting base (301), a twisting block (302g) provided on the connecting plate (302c), and a positioning groove 2 (302h) provided on one side of the positioning groove 1 (302f).

6. A DC resistance tester, characterized in that: The clamping mechanism comprises any one of claims 1 to 5, further comprising: A transmission unit (400) includes a lead (401) disposed on the fixing component (103), a transmission component 1 (402) disposed at one end of the lead (401), and a transmission component 2 (403) disposed at one side of the transmission component 1 (402); and The measuring unit (500) includes a measuring instrument body (501) arranged on the transmission component 1 (402), a power supply component (502) arranged on the measuring instrument body (501), and a terminal component (503) arranged on the measuring instrument body (501).

7. The DC resistance tester according to claim 6, characterized in that: The transmission component (402) includes a fixed base (402a) provided on the measuring instrument body (501), a fixed sleeve (402b) provided on the fixed base (402a), and a socket (402c) provided on the fixed sleeve (402b); The measuring instrument body (501) is provided with a groove (504), and the groove (504) is provided with an energizing column (505).

8. The DC resistance tester according to claim 7, wherein: The second transmission component (403) includes a second fixed base (403a) provided on the measuring instrument body (501), a second fixed sleeve (403b) provided on the second fixed base (403a), and a second socket (403c) provided on the second fixed sleeve (403b); A communication antenna (506) is provided on the measuring instrument body (501), and an instrument touch screen (507) is provided on one side of the communication antenna (506).

9. The DC resistance tester according to claim 8, characterized in that: The power supply component (502) includes a fixed base three (502a) arranged on the measuring instrument body (501), and a button (502b) arranged on the fixed base three (502a).

10. The DC resistance tester according to claim 9, characterized in that: The terminal assembly (503) includes a fixed base four (503a) arranged on the measuring instrument body (501), and a ground terminal (503b) arranged on the fixed base four (503a).

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