Device and method for testing loop resistance of inner cone sleeve

Abstract

The invention relates to the technical field of high-voltage switch equipment testing, in particular to an inner cone sleeve loop resistance testing device and method. The inner cone sleeve loop resistance testing device comprises a current transmission mechanism and a conductive mechanism arranged at one end of the current transmission mechanism, and the conductive mechanism comprises a contact and a plurality of conductive contact fingers which are annularly arranged on the outer side of the contact, are used for being in contact with a conductor on the inner wall of an inner cone sleeve and have different diameters. The conductive contact fingers are arranged in the direction of the current transmission mechanism according to the diameter from small to large. The contact is connected with the current transmission mechanism and is used for being matched with the inner cone sleeve; the conductive contact fingers with different diameters are used for adapting to inner cone sleeves with different models and guiding current into the current transmission mechanism, and one end, far away from the conductive mechanism, of the current transmission mechanism is connected with a wiring end of a loop resistance tester. The device for testing the loop resistance of the inner cone sleeve can be used for testing the loop resistance of various different models of inner cone sleeves at the same time, and is simple to operate and quick to mount.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage switchgear testing, and in particular to a device and method for testing the loop resistance of an inner cone bushing. Background Art

[0002] At present, inner cone bushings are widely used in medium and high pressure inflatable cabinets as ports for incoming and outgoing lines. During installation, commissioning, inspection and maintenance, it is necessary to measure the loop resistance. Since the ports of the inner cone bushings do not match the wiring terminals of the loop resistance tester, there are many defects in the loop resistance test.

[0003] During traditional measurements, the wiring of the current input and output points needs to be fixed with the help of manual assistance, and the cooperation of multiple people is required to complete the test. However, manual assisted fixation will affect the poor contact between the wiring terminal of the loop resistance tester and the input or output terminal of the inner cone bushing, and the stability of the contact will decrease, affecting the accuracy of the test. At the same time, after multiple measurements, the temperature of the wiring terminal of the loop resistance tester and the input or output terminal of the inner cone bushing will increase, and the danger of manual assisted fixation will increase.

[0004] The Chinese utility model patent with the authorization announcement date of July 22, 2009 and the authorization announcement number of CN201277980Y discloses a resistance test adapter for the inner cone casing loop, which includes a current introduction rod, a contact, a measuring point output rod, a compression spring and an insulating connecting plate. When measuring, the adapter is inserted into the inner cone casing, the measuring point output rod is placed on the measuring point, and then the current output line and the measuring input line of the loop resistance tester are clamped on the adapter current input rod and the measuring point output rod on the outside of the adapter to test the loop resistance. The adapter described in the utility model does not need to be manually controlled during measurement for current introduction and measuring point output, which eliminates the influence of human factors on the measurement results and improves the accuracy of the measurement.

[0005] However, the contact diameter of the resistance test adapter for the inner cone casing loop is fixed, and it is only suitable for resistance testing of a fixed type of inner cone casing loop. When resistance tests of multiple types of inner cone casing loops are required, multiple resistance test adapters with different contact diameters are required, and resistance tests of different types of inner cone casing loops cannot be completed on the same inner cone casing loop resistance test device; at the same time, the resistance test adapter can only be tested in the horizontal direction and cannot be tested in multiple dimensions. Summary of the invention

[0006] The purpose of the present invention is to provide an inner cone casing loop resistance testing device to solve the problem that the resistance testing adapter of the inner cone casing loop in the prior art cannot perform resistance testing of inner cone casing loops of different models.

[0007] In order to solve the above problems, the present invention proposes an inner cone casing loop resistance test device, and the technical solution adopted is:

[0008] A device for testing the loop resistance of an inner cone bushing comprises a current transmission mechanism and a conductive mechanism arranged at one end of the current transmission mechanism, wherein the conductive mechanism comprises a contact and a plurality of conductive contact fingers of different diameters which are arranged in an annular manner on the outside of the contact and are used to contact the conductor on the inner wall of the inner cone bushing, wherein the conductive contact fingers are arranged from small to large in diameter in the direction of the current transmission mechanism; the contact is connected to the current transmission mechanism and is used to cooperate with the inner cone bushing; the conductive contact fingers of different diameters are used to adapt to different types of inner cone bushings and introduce current into the current transmission mechanism, and one end of the current transmission mechanism away from the conductive mechanism is connected to a terminal of a loop resistance tester.

[0009] Furthermore, the contact is provided with grooves of multiple diameters, and the grooves are arranged from small to large in diameter toward the current transmission mechanism. The conductive contact fingers are spring contact fingers, and the spring contact fingers are sleeved on the contact through the grooves and contact the conductor on the inner wall of the inner cone sleeve.

[0010] Furthermore, an insulating mounting component is detachably connected to the current transmission mechanism, and the insulating mounting component is fixedly connected to the base of the inner cone sleeve to achieve fixation of the conductive mechanism and the current transmission mechanism to the inner cone sleeve.

[0011] Furthermore, the current transmission mechanism comprises a guide rod, the guide rod is detachably connected to the contact, and the insulating mounting component is detachably connected to the guide rod.

[0012] Furthermore, the insulating mounting component is a circular insulating plate with a first internal threaded hole, the guide rod is provided with an external thread, and the guide rod and the circular insulating plate are threadedly connected so that the circular insulating plate moves along the length direction of the guide rod.

[0013] Furthermore, the circular insulating plate is provided with inner cone sleeve mounting holes of multiple specifications, and the inner cone sleeve mounting holes are used to fix different types of inner cone sleeve bases to the circular insulating plate by screws, wherein the inner cone sleeve mounting holes of the same specifications are evenly arranged along the circumferential surface on the circular insulating plate.

[0014] Furthermore, the guide rod is a wedge-shaped guide rod, a wedge-shaped end is provided at one end of the wedge-shaped guide rod, a wedge-shaped hole is provided inside the contact, the wedge-shaped end is wedge-shapedly connected to the wedge-shaped hole, a continuous external thread is provided on the end of the wedge-shaped guide rod away from the wedge-shaped end, and the circular insulating plate is connected to the wedge-shaped guide rod via the continuous external thread.

[0015] Furthermore, the guide rod is a threaded guide rod, one end of which is provided with an external threaded end, a second internal threaded hole is provided inside the contact, the external threaded end is threadedly connected to the second internal threaded hole, the threaded guide rod is provided with multiple sections of fastening threads, and the circular insulating plate is connected to the threaded guide rod through the multiple sections of fastening threads.

[0016] Furthermore, the current transmission mechanism also includes an L-shaped copper plate, a copper plate mounting hole is provided on one side of the L-shaped copper plate, a third internal threaded hole is provided on the end of the guide rod away from the contact, the copper plate mounting hole is connected to the third internal threaded hole on the guide rod by a screw, and the other side of the L-shaped copper plate is used to connect to the wiring terminal of the loop resistance tester.

[0017] Beneficial effects: The present invention is an improved invention. The present invention is used to input current into the current transmission mechanism by arranging multiple ring-shaped conductive contact fingers of different diameters on the outside of the contact and used to contact the inner wall conductor of the inner cone bushing; at the same time, the conductive contact fingers are arranged from small to large in diameter toward the current transmission mechanism. Since different types of inner cone bushings have different specific diameters, conductive contact fingers with different diameters can adapt to different types of inner cone bushings to input current, and have a wide range of uses. The inner cone bushing loop resistance test device of the present invention can simultaneously meet the requirements of multiple different types of inner cone bushing loop resistance tests, and can complete resistance tests of different types of inner cone bushing loops on the same inner cone bushing loop resistance test device. At the same time, it does not rely on manual auxiliary fixed testing, and is simple to operate and quick to install.

[0018] The contact is provided with grooves of multiple diameters, and the grooves are arranged from small to large in diameter toward the direction of the current transmission mechanism. The conductive contact fingers are spring contact fingers, and the spring contact fingers are sleeved on the contact through the grooves and contact the conductor on the inner wall of the inner cone sleeve. The spring contact fingers make the connection between the spring contact fingers and the conductor on the inner wall of the inner cone sleeve tighter, and play a fixing role while conducting electricity, so that the contact installation is stable. The structure is simple and easy to operate.

[0019] The current transmission mechanism is detachably connected with an insulating mounting component, and the insulating mounting component is fixedly connected to the base of the inner cone casing to achieve fixation of the conductive mechanism and the current transmission mechanism to the inner cone casing. This solution fixes the inner cone casing loop resistance test device for easy testing, and no manual auxiliary fixation is required after fixation. At the same time, multi-dimensional testing can be performed, thereby improving the safety of the test process and the accuracy of the test results.

[0020] The current transmission mechanism comprises a guide rod, the guide rod is detachably connected to the contact, and the insulating mounting component is detachably connected to the guide rod. The structure is simple and convenient for connecting different types of guide rods and contacts.

[0021] The insulating mounting component is a circular insulating plate with a first internal threaded hole, and an external thread is provided on the guide rod. The guide rod and the circular insulating plate are threadedly connected so that the circular insulating plate can move along the length direction of the guide rod. This scheme adjusts the position of the circular insulating plate on the guide rod through the thread to adapt to inner cone sleeves of different depths, thereby realizing the fixation of inner cone sleeves of different models.

[0022] The circular insulating plate is provided with inner cone sleeve mounting holes of multiple specifications, and the inner cone sleeve mounting holes are used to fix different types of inner cone sleeve bases to the circular insulating plate by screws, wherein the inner cone sleeve mounting holes of the same specifications are evenly arranged along the circumferential surface on the circular insulating plate. The inner cone sleeve mounting holes on the circular insulating plate can be quickly positioned with the inner cone sleeve base mounting holes, and the installation is fast; at the same time, the fixing method thereof selects the inner cone sleeve base mounting holes for installation nearby, and the operation is simple; and it is suitable for different types of inner cone sleeves.

[0023] The guide rod is a wedge-shaped guide rod, a wedge-shaped end is provided at one end of the wedge-shaped guide rod, a wedge-shaped hole is provided inside the contact, the wedge-shaped end is wedge-shapedly connected to the wedge-shaped hole, a continuous external thread is provided on the end of the wedge-shaped guide rod away from the wedge-shaped end, and the circular insulating plate is connected to the wedge-shaped guide rod through the continuous external thread. The structure is simple, and it is convenient to operate the cooperation between the guide rod and the contact, and it is also convenient to realize the reciprocating movement of the circular insulating plate along the length direction of the guide rod.

[0024] The guide rod is a threaded guide rod, one end of which is provided with an external threaded end, a second internal threaded hole is provided inside the contact, the external threaded end is threadedly connected to the second internal threaded hole, and a plurality of fastening threads are provided on the threaded guide rod. The circular insulating plate is connected to the threaded guide rod through the plurality of fastening threads, which effectively prevents the circular insulating plate from reciprocating on the continuous external threads to adapt to the fixation of different types of inner cone sleeves, causing the silver plating layer on its surface to fall off due to rotation, resulting in an increase in the resistance of the test device body, thereby affecting the test error.

[0025] The current transmission mechanism also includes an L-shaped copper plate, a copper plate mounting hole is provided on one side of the L-shaped copper plate, a third internal threaded hole is provided on the end of the guide rod away from the contact, the copper plate mounting hole is connected to the third internal threaded hole on the guide rod by a screw, and the other side of the L-shaped copper plate is used to connect to the wiring terminal of the loop resistance tester, so as to effectively realize the connection with the wiring terminal of the loop resistance tester.

[0026] The present invention also provides a method for testing the loop resistance of an inner cone casing, which is implemented by using the inner cone casing loop resistance testing device described above. First, the contact in the conductive mechanism in the inner cone casing loop resistance testing device is inserted into the inner cone casing, so that the conductive contact finger in the conductive mechanism contacts the inner wall conductor of the inner cone casing, and the conductive contact finger inputs the current into the current transmission mechanism; then, the wiring terminal of the loop resistance tester is connected to the current transmission mechanism to complete the inner cone casing loop resistance test.

[0027] Beneficial effect: The inner cone casing loop resistance testing method of the present invention can simultaneously meet the requirements of inner cone casing loop resistance testing of multiple different types, and can complete resistance testing of inner cone casing loops of different types on the same inner cone casing loop resistance testing device. At the same time, it does not rely on manual auxiliary fixed testing and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 1 is a schematic structural diagram of an inner cone casing loop resistance testing device in Embodiment 1 of the inner cone casing loop resistance testing device of the present invention;

[0029] Figure 2 It is a schematic diagram of a T-type contact in Embodiment 1 of the inner cone bushing loop resistance testing device of the present invention;

[0030] Figure 3 Schematic diagram of the spring contact finger in the embodiment 1 of the inner cone casing loop resistance test device of the present invention;

[0031] Figure 4 Schematic diagram of a wedge-shaped guide rod in Embodiment 3 of the inner cone casing loop resistance testing device of the present invention;

[0032] Figure 5 Schematic diagram of the threaded guide rod in the embodiment 3 of the inner cone casing loop resistance testing device of the present invention;

[0033] Figure 6 Schematic diagram of a circular insulating plate in Embodiment 2 of the inner cone casing loop resistance testing device of the present invention;

[0034] Figure 7 Schematic diagram of the L-shaped copper plate in Example 4 of the inner cone casing loop resistance testing device of the present invention;

[0035] Figure 8 It is a schematic diagram of testing the loop resistance of a 2# inner cone casing using a wedge-shaped guide rod in Example 1 of the inner cone casing loop resistance testing method of the present invention;

[0036] Fig. 9 It is a schematic diagram of testing the loop resistance of a 3# inner cone casing using a wedge-shaped guide rod in Example 1 of the inner cone casing loop resistance testing method of the present invention;

[0037] Fig.10 It is a schematic diagram of testing the loop resistance of a 3# inner cone casing using a threaded guide rod in Example 1 of the inner cone casing loop resistance testing method of the present invention;

[0038] In the figure, 1, 2nd level T-type contact, 11, wedge-shaped hole, 12, large diameter spring contact finger set groove, 13, small diameter spring contact finger set groove, 2, spring contact finger, 21, small diameter spring contact finger, 22, large diameter spring contact finger, 3, wedge-shaped guide rod, 31, wedge-shaped end, 32, continuous external thread, 33, internal thread countersunk hole, 34, external thread end, 35, 2# inner cone sleeve mounting plate fastening thread, 36, 3# inner cone sleeve mounting plate fastening thread, 37, test end, 4, round insulating plate, 41, the first An internal threaded hole, 42, 2# inner cone bushing mounting hole, 43, 3# inner cone bushing mounting hole, 5, L-shaped copper plate, 51, copper plate mounting hole, 6, screw, 7, 2# inner cone bushing, 71, 2# inner cone bushing inner wall conductor, 72, 2# inner cone bushing base internal threaded hole, 73, 2# inner cone bushing base, 74, 2# inner cone bushing internal insulator, 8, 3# inner cone bushing, 81, 3# inner cone bushing inner wall conductor, 82, 3# inner cone bushing base internal threaded hole, 83, 3# inner cone bushing base. DETAILED DESCRIPTION

[0039] As cited in the background technology, the resistance test adapter of the inner cone casing loop in the prior art cannot perform resistance tests on inner cone casing loops of different models. Therefore, the present invention provides an inner cone casing loop resistance test device, including a current transmission mechanism for transmitting current, and a conductive mechanism arranged at one end of the current transmission mechanism, which is used to contact the inner wall conductor of the inner cone casing to introduce the current into the current transmission mechanism; the conductive mechanism includes a contact and a plurality of conductive contact fingers of different diameters arranged in an annular manner on the outside of the contact and used to contact the inner wall conductor of the inner cone casing, the contact is used to match the inner cone casing loop resistance test device with the inner cone casing, and the conductive contact fingers are used to introduce the current in the inner cone casing into the current transmission mechanism; the conductive contact fingers are arranged from small to large in diameter toward the current transmission mechanism. Since different models of inner cone casings have different specific diameters, conductive contact fingers with different diameters can adapt to different models of inner cone casings to realize current input, and have a wide range of uses. The inner cone casing loop resistance test device of the present invention can meet the requirements of various different models of inner cone casing loop resistance tests, and does not rely on artificial auxiliary fixed testing, is simple to operate, and is quick to install.

[0040] Specific embodiment 1 of the inner cone casing loop resistance test device of the present invention:

[0041] In this embodiment, Figure 1As shown, the inner cone casing loop resistance test device includes a current transmission mechanism and a conductive mechanism arranged at one end of the current transmission mechanism. The conductive mechanism includes a plurality of conductive contact fingers of different diameters arranged in an annular manner outside the contact and used to contact the inner wall conductor of the inner cone casing. The conductive contact fingers are arranged in the direction of the current transmission mechanism from small to large in diameter, that is, the conductive contact fingers with small diameters are close to the position of the contact, and the contact is connected to the current transmission mechanism. Figure 2 , Figure 3 As shown, the contact is a two-stage T-type contact 1, and a groove with two diameters is arranged on the T-type contact. The conductive contact finger is a spring contact finger 2. Specifically, the groove on the T-type contact includes a small-diameter spring contact finger fitting groove 13 and a large-diameter spring contact finger fitting groove 12. The spring contact finger 2 includes a small-diameter spring contact finger 21 and a large-diameter spring contact finger 22. The small-diameter spring contact finger 21 and the large-diameter spring contact finger 22 are respectively and correspondingly fitted in the small-diameter spring contact finger fitting groove 13 and the large-diameter spring contact finger fitting groove 12, and the small-diameter spring contact finger fitting groove 13 is arranged before the large-diameter spring contact finger fitting groove 12 relative to the top of the contact, so as to meet the installation circuit of various types of inner cone sleeves.

[0042] When measuring different types of inner cone bushings, a T-type contact equipped with spring contact fingers 2 is inserted into the inner cone bushing to complete the matching. Spring contact fingers 2 of different diameters on the T-type contact form close contact with the inner wall conductor of different types of inner cone bushings. The spring contact fingers 2 input current into the current transmission mechanism and are connected to the wiring terminal of the loop resistance tester through the current transmission mechanism, thereby realizing the loop resistance test of the corresponding type of inner cone bushing.

[0043] In other embodiments, the contact is a T-type contact, and two convex rings of different diameters are annularly arranged on the T-type contact, and the conductive contact finger is the convex ring, and the convex ring is integrally arranged with the T-type contact, and the small-diameter convex ring is arranged before the large-diameter convex ring near the top of the contact. When measuring different types of inner cone bushings, the T-type contact is inserted into the inner cone bushing to complete the matching, and the convex rings of different diameters on the T-type contact form close contact with the inner wall conductors of the inner cone bushings of different types. The convex ring inputs the current into the current transmission mechanism, and is connected to the wiring terminal of the loop resistance tester through the current transmission mechanism, that is, the loop resistance test of the corresponding type of inner cone bushing is realized.

[0044] In other embodiments, the T-type contact may be a 3-level T-type contact or a 4-level T-type contact depending on the model of the inner cone sleeve.

[0045] In other embodiments, the conductive contact fingers are watch strap contact fingers.

[0046] Specific embodiment 2 of the inner cone casing loop resistance test device of the present invention:

[0047] Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0048] In this embodiment, Figure 1 As shown, the current transmission mechanism is detachably connected with an insulating mounting component, which is fixedly connected to the base of the inner cone bushing, thereby fixing the conductive mechanism and the current transmission mechanism to the inner cone bushing. The current transmission mechanism includes a guide rod, which is detachably connected to the T-type contact, and the insulating mounting component is detachably connected to the guide rod, so that the inner cone bushing loop resistance test device can be fixed for easy testing, and no manual auxiliary fixing is required after fixing, thereby improving the safety of the test process and the accuracy of the test results.

[0049] When the insulating mounting component is installed on the guide rod, the insulating mounting component can be fixedly connected to the guide rod, that is, the insulating mounting component cannot move on the guide rod. At this time, since the position of the insulating mounting component on the guide rod is fixed, it cannot move on the guide rod, resulting in that it may only be suitable for the fixed connection of one type of inner cone sleeve base, and cannot adapt to the fixed connection of the base of the inner cone sleeve of different depths. Therefore, in this embodiment, preferably, as Figure 6 As shown, the insulating mounting component is a circular insulating plate 4 with a first internal threaded hole 41, and the circular insulating plate 4 is an epoxy glass cloth plate; an external thread is provided on the guide rod, and the guide rod and the circular insulating plate 4 are threadedly connected so that the circular insulating plate 4 can reciprocate along the length direction of the guide rod. This solution can adjust the position of the circular insulating plate 4 on the guide rod through the thread to adapt to inner cone sleeves of different depths, thereby realizing the fixation of inner cone sleeves of different models.

[0050] Specifically, the circular insulating plate 4 is provided with inner cone sleeve mounting holes of multiple specifications, and the inner cone sleeve mounting holes are used to fix different types of inner cone sleeve bases to the circular insulating plate 4 through screws 6, wherein the inner cone sleeve mounting holes of the same specifications are evenly arranged along the circumferential surface on the circular insulating plate 4. Specifically, on the circular insulating plate 4, the 2# inner cone sleeve has a 2# inner cone sleeve mounting hole 42, which corresponds to the 2# inner cone sleeve base internal threaded hole 72; the 3# inner cone sleeve has a 3# inner cone sleeve mounting hole 43, which corresponds to the 3# inner cone sleeve base internal threaded hole 82. The inner cone sleeve mounting hole on the circular insulating plate 4 can be quickly positioned with the inner cone sleeve base mounting hole, and the installation is fast; at the same time, the fixing method thereof selects the inner cone sleeve base mounting hole nearby for installation, and the operation is simple; and it is suitable for different types of inner cone sleeves.

[0051] In other embodiments, the guide rod and the T-shaped contact may be integrally welded.

[0052] In other embodiments, the circular insulating plate 4 may be made of other hard insulating materials.

[0053] Specific embodiment 3 of the inner cone casing loop resistance test device of the present invention:

[0054] Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0055] In order to facilitate the quick connection and disassembly of the contacts and the guide rod, in this embodiment, Figure 2 , Figure 4 As shown, the guide rod is a wedge-shaped guide rod 3, a wedge-shaped end 31 is provided at one end of the wedge-shaped guide rod 3, a wedge-shaped hole 11 is provided inside the contact, the wedge-shaped end 31 of the wedge-shaped guide rod 3 is wedge-shaped connected to the wedge-shaped hole 11 of the contact, and a continuous external thread 32 is provided on the end of the wedge-shaped guide rod 3 away from the wedge-shaped end 31, and the circular insulating plate 4 is connected to the wedge-shaped guide rod 3 through the continuous external thread 32. The structure is simple and easy to operate to realize the reciprocating movement of the circular insulating plate 4 along the length direction of the guide rod, that is, it meets the needs of various models (2# inner cone sleeve, 3## inner cone sleeve, 4# inner cone sleeve) inner cone sleeve loops and guide rod designs of different depths.

[0056] In another embodiment, if Figure 5 As shown, the guide rod is a threaded guide rod, one end of the threaded guide rod is provided with an external threaded end 34, a second internal threaded hole is provided inside the contact, the external threaded end 34 is threadedly connected to the second internal threaded hole, and the threaded guide rod is provided with multiple sections of fastening threads, namely, 2# inner cone sleeve mounting plate fastening threads 35 and 3# inner cone sleeve mounting plate fastening threads 36, and the circular insulating plate 4 is connected to the threaded guide rod through the multiple sections of fastening threads. When in use, when used to test the loop resistance of 2# inner cone sleeve 7, the circular insulating plate 4 is connected to the 2# inner cone sleeve mounting plate fastening threads 35; when used to test the loop resistance of 3# inner cone sleeve 8, the circular insulating plate 4 is connected to the 3# inner cone sleeve mounting plate fastening threads 36, which effectively prevents the circular insulating plate 7 from moving back and forth on the continuous external threads to adapt to the fixation of different types of inner cone sleeves, causing the silver plating layer on its surface to fall off due to rotation, resulting in an increase in the resistance of the test device body, thereby affecting the test error.

[0057] In other embodiments, the guide rod is a wedge-shaped guide rod 3, which is provided with multiple sections of fastening threads, namely, 2# inner cone sleeve mounting plate fastening threads 35 and 3# inner cone sleeve mounting plate fastening threads 36, and the circular insulating plate 4 is connected to the wedge-shaped guide rod 3 through multiple sections of fastening threads.

[0058] In other embodiments, the guide rod is a threaded guide rod, and a continuous external thread 32 is provided on one end of the threaded guide rod away from the external thread end 34 . The circular insulating plate 4 is connected to the wedge-shaped guide rod 3 via the continuous external thread 32 .

[0059] Specific embodiment 4 of the inner cone casing loop resistance test device of the present invention:

[0060] Based on the above technical concept of the present invention, or based on the above specific embodiment of the present invention, another embodiment is provided below.

[0061] In this embodiment, Figure 7 As shown, the current transmission mechanism also includes an L-shaped copper plate 5, a copper plate mounting hole 51 is provided on one side of the L-shaped copper plate 5, and a third internal threaded hole is provided on the end of the guide rod away from the contact, that is, the copper plate mounting hole 51 is connected to the third internal threaded hole on the guide rod through a screw 6, and the other side of the L-shaped copper plate 5 is used to connect to the terminal of the loop resistance tester, wherein the T-shaped contact, the guide rod, the spring contact finger 2, and the L-shaped copper plate 5 should be silver-plated.

[0062] Specifically, when the guide rod is a wedge-shaped guide rod 3, an internal threaded countersunk hole 33 is provided on the end of the wedge-shaped guide rod 3 away from the contact, and the copper plate mounting hole 51 is connected to the internal threaded countersunk hole 33 on the wedge-shaped guide rod 3 through a screw 6, and the other side of the L-shaped copper plate 5 is used to connect to the terminal of the loop resistance tester, which is convenient for connection with the terminal of the loop resistance tester.

[0063] Specifically, when the guide rod is a threaded guide rod, an internal threaded countersunk hole is also provided on the end of the threaded guide rod away from the contact, and the copper plate mounting hole 51 is connected to the internal threaded countersunk hole on the threaded guide rod through a screw 6, and the other side of the L-shaped copper plate 5 is used to connect the wiring terminal of the loop resistance tester.

[0064] In other embodiments, for the threaded guide rod, a test end 37 is provided on the end of the threaded guide rod away from the contact, and the test end 37 is integrally connected to the threaded guide rod for connecting to the terminal of the loop resistance tester. This structure does not require an L-shaped copper plate 5 and can directly connect to the terminal of the loop resistance tester, and has a simple structure.

[0065] In other embodiments, for the wedge-shaped guide rod 3, a test end 37 is provided at one end of the wedge-shaped guide rod 3 away from the contact, and the test end 37 is integrally connected to the wedge-shaped guide rod 3 for connecting to a terminal of a loop resistance tester.

[0066] In other embodiments, when the current transmission mechanism further includes an L-shaped copper plate 5 , the loop resistance tester terminal can be directly connected to the screw 6 .

[0067] In other embodiments, the loop resistance tester terminal may also be directly connected to the end of the threaded guide rod or the wedge-shaped guide rod 3 away from the contact.

[0068] In other embodiments, the L-shaped copper plate 5 and the end of the threaded guide rod or the wedge-shaped guide rod 3 can be welded integrally.

[0069] In other embodiments, the T-shaped contact, the guide rod, and the L-shaped copper plate 5 may also be made of pure copper.

[0070] Specific embodiment 1 of the inner cone casing loop resistance testing method of the present invention:

[0071] In this embodiment, the inner cone casing loop resistance test method is implemented by the inner cone casing loop resistance test device described above. First, the contact in the conductive mechanism in the inner cone casing loop resistance test device is inserted into the inner cone casing, so that the conductive contact finger in the conductive mechanism contacts the inner wall conductor of the inner cone casing, and the conductive contact finger inputs the current into the current transmission mechanism; then, the loop resistance tester terminal is connected to the current transmission mechanism to complete the inner cone casing loop resistance test.

[0072] Specifically, when testing the resistance of the 7th loop of the 2# inner cone casing, if Figure 8 As shown, first, the second-level T-type contact 1 equipped with the spring contact finger 2 is inserted into the 2# inner cone sleeve 7, and the small-diameter spring contact finger 21 on the second-level T-type contact 1 is in close contact with the inner wall conductor 71 of the 2# inner cone sleeve, wherein the wedge-shaped end 31 of the wedge-shaped guide rod 3 is wedge-shapedly connected with the wedge-shaped hole 11 of the contact; secondly, the circular insulating plate 4 is rotated so that the circular insulating plate 4 moves along the length direction of the guide rod on the continuous external thread 32 on the wedge-shaped guide rod 3, so that the circular insulating plate 4 is in contact with the position of the base 73 of the 2# inner cone sleeve; Then, pass the screw 6 through the 2# inner cone bushing mounting hole 42 and connect it to the internal threaded hole 72 of the 2# inner cone bushing base to fix the second-level T-type contact 1 and the wedge-shaped guide rod 3, wherein the position close to the conductor inside the 2# inner cone bushing 7 is the internal insulator 74 of the 2# inner cone bushing; then, connect the L-shaped copper plate 5 to the internal threaded countersunk hole on the wedge-shaped guide rod 3 through the copper plate mounting hole 51 using the screw 6; finally, connect the loop resistance tester terminal to the L-shaped copper plate 5 to realize the loop resistance test of the 2# inner cone bushing.

[0073] Specifically, when testing the 8-loop resistance of the 3# inner cone casing, Fig. 9 As shown, first, insert the 3rd-level T-type contact with the spring contact finger 2 into the 3# inner cone bushing 8, and the large-diameter spring contact finger 22 on the 3rd-level T-type contact is in close contact with the inner wall conductor 81 of the 3# inner cone bushing, wherein the wedge-shaped end 31 of the wedge-shaped guide rod 3 is wedge-shaped connected with the wedge-shaped hole 11 of the contact; secondly, rotate the circular insulating plate 4 so that the circular insulating plate 4 moves along the length direction of the guide rod on the continuous external thread 32 on the wedge-shaped guide rod 3, so that the circular insulating plate 4 is in position contact with the 3# inner cone bushing base 83; then, pass the screw 6 through the 3# inner cone bushing mounting hole 43, connect it with the 3# inner cone bushing base internal thread hole 82, and fix the 3rd-level T-type contact and the wedge-shaped guide rod 3; then, connect the L-shaped copper plate 5 with the internal thread countersunk hole on the wedge-shaped guide rod 3 through the copper plate mounting hole 51 using the screw 6; finally, connect the loop resistance tester terminal with the L-shaped copper plate 5, that is, realize the 3# inner cone bushing loop resistance test.

[0074] In another embodiment, when testing the loop resistance of the 3# inner cone casing 8, Fig.10 As shown, first, insert the 3rd-level T-type contact equipped with the spring contact finger 2 into the 3# inner cone bushing 8, and the large-diameter spring contact finger 22 on the 3rd-level T-type contact is in close contact with the inner wall conductor 81 of the 3# inner cone bushing, wherein the outer threaded end 34 of the threaded guide rod is threadedly connected with the inner threaded hole of the contact; secondly, rotate the circular insulating plate 4 so that the circular insulating plate 4 moves along the length direction of the guide rod on the fastening thread 36 of the 3# inner cone bushing mounting plate, so that the circular insulating plate 4 is in contact with the position of the 3# inner cone bushing base 83; then, pass the screw 6 through the 3# inner cone bushing mounting hole 43, connect it with the inner threaded hole 82 of the 3# inner cone bushing base, and fix the 3rd-level T-type contact and the threaded guide rod; finally, the loop resistance tester terminal and the end of the threaded guide rod away from the contact are provided with a test end 37, that is, the loop resistance test of the 3# inner cone bushing is realized.

[0075] Through the above description of the specific embodiment of the inner cone casing loop resistance test device of the present invention, it can be seen that the inner cone casing loop resistance test device of the present invention includes a current transmission mechanism for transmitting current, and a conductive mechanism arranged at one end of the current transmission mechanism, which is used to contact the inner wall conductor of the inner cone casing to introduce the current into the current transmission mechanism; the conductive mechanism includes a contact and a plurality of conductive contact fingers of different diameters arranged in an annular manner on the outside of the contact and used to contact the inner wall conductor of the inner cone casing, the contact is used to match the inner cone casing loop resistance test device with the inner cone casing, and the conductive contact fingers are used to introduce the current in the inner cone casing into the current transmission mechanism; the conductive contact fingers are arranged from small to large in diameter toward the direction of the current transmission mechanism. Since different types of inner cone casings have different specific diameters, conductive contact fingers with different diameters can adapt to different types of inner cone casings to realize current input, and have a wide range of uses. The inner cone casing loop resistance test device of the present invention can meet the needs of various different types of inner cone casing loop resistance tests, and is simple to operate and quick to install.

[0076] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. An inner cone casing loop resistance test device, It is characterized in that It comprises a current transmission mechanism and a conductive mechanism arranged at one end of the current transmission mechanism, wherein the conductive mechanism comprises a contact and a plurality of conductive contact fingers of different diameters which are arranged in an annular manner on the outside of the contact and are used to contact the conductor on the inner wall of the inner cone sleeve, and the conductive contact fingers are arranged from small to large in diameter toward the current transmission mechanism; the contact is connected to the current transmission mechanism and is used to cooperate with the inner cone sleeve; the conductive contact fingers of different diameters are used to adapt to different types of inner cone sleeves and introduce current into the current transmission mechanism, and one end of the current transmission mechanism away from the conductive mechanism is connected to the wiring terminal of a loop resistance tester.

2. The inner cone casing loop resistance testing device according to claim 1, It is characterized in that The contact is provided with grooves of multiple diameters, and the grooves are arranged in increasing diameters toward the current transmission mechanism. The conductive contact fingers are spring contact fingers, which are sleeved on the contact through the grooves and contact the conductor on the inner wall of the inner cone sleeve.

3. The inner cone casing loop resistance testing device according to claim 2, It is characterized in that The current transmission mechanism is detachably connected with an insulating mounting component, and the insulating mounting component is fixedly connected to the base of the inner cone sleeve to achieve fixation of the conductive mechanism and the current transmission mechanism to the inner cone sleeve.

4. The inner cone casing loop resistance testing device according to claim 3, It is characterized in that The current transmission mechanism comprises a guide rod, the guide rod is detachably connected to the contact, and the insulating mounting component is detachably connected to the guide rod.

5. The inner cone casing loop resistance testing device according to claim 4, It is characterized in that The insulating installation component is a circular insulating plate with a first internal threaded hole. The guide rod is provided with an external thread. The guide rod and the circular insulating plate are threadedly connected so that the circular insulating plate moves along the length direction of the guide rod.

6. The inner cone casing loop resistance testing device according to claim 5, It is characterized in that The circular insulating plate is provided with inner cone sleeve mounting holes of multiple specifications, and the inner cone sleeve mounting holes are used to fix different types of inner cone sleeve bases to the circular insulating plate by screws, wherein the inner cone sleeve mounting holes of the same specifications are evenly arranged along the circumferential surface on the circular insulating plate.

7. The inner cone casing loop resistance testing device according to claim 6, It is characterized in that The guide rod is a wedge-shaped guide rod, a wedge-shaped end is provided at one end of the wedge-shaped guide rod, a wedge-shaped hole is provided inside the contact, the wedge-shaped end is wedge-shapedly connected to the wedge-shaped hole, a continuous external thread is provided on the end of the wedge-shaped guide rod away from the wedge-shaped end, and the circular insulating plate is connected to the wedge-shaped guide rod through the continuous external thread.

8. The inner cone casing loop resistance testing device according to claim 6, It is characterized in that The guide rod is a threaded guide rod, one end of which is provided with an external threaded end, a second internal threaded hole is provided inside the contact, the external threaded end is threadedly connected to the second internal threaded hole, the threaded guide rod is provided with multiple sections of fastening threads, and the circular insulating plate is connected to the threaded guide rod through the multiple sections of fastening threads.

9. The inner cone casing loop resistance testing device according to claim 7 or 8, It is characterized in that The current transmission mechanism also includes an L-shaped copper plate, a copper plate mounting hole is provided on one side of the L-shaped copper plate, a third internal threaded hole is provided on the end of the guide rod away from the contact, the copper plate mounting hole is connected to the third internal threaded hole on the guide rod by a screw, and the other side of the L-shaped copper plate is used to connect the loop resistance tester terminal.

10. A method for testing the resistance of an inner cone casing loop, implemented by using the inner cone casing loop resistance testing device according to any one of claims 1 to 9, It is characterized in that First, insert the contact in the conductive mechanism of the inner cone bushing loop resistance test device into the inner cone bushing so that the conductive contact finger in the conductive mechanism contacts the inner wall conductor of the inner cone bushing, and the conductive contact finger inputs the current into the current transmission mechanism; then, connect the wiring terminal of the loop resistance tester to the current transmission mechanism to complete the inner cone bushing loop resistance test.

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