Transformer DC resistance tester

Abstract

The invention relates to a transformer direct current resistance tester. The transformer direct current resistance tester comprises a box body, an operation panel and a wiring terminal arranged on the operation panel, the limiting mechanism is used for limiting pulling-out of the detection line; the driving mechanism is used for controlling the limiting mechanism to contact and limit the detection line; the limiting mechanism comprises a limiting plate which is movably arranged on the operation panel; the transmission assembly is used for controlling the movement direction and position of the limiting plate; the wiring port and the detection port are both arranged on the limiting plate, the end part of a detection line penetrates through the wiring port to be connected with the wiring end, and the detection port is used for the detection line to penetrate through; the transmission assembly is used for enabling the detection opening in the limiting plate to move to the position above the end of the detection line. According to the invention, the detection line is limited, so that the effect of improving the safety performance after external power failure is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of resistance testing, and in particular to a transformer DC resistance tester. Background Art

[0002] Currently, transformer DC resistance is a mandatory test item during factory testing of semi-finished and finished products, installation, overhaul, after tap-changer changes, acceptance testing, and preventive testing by power companies. A transformer DC resistance tester can verify the welding quality of winding joints and the presence of inter-turn short circuits. It can also check the contact quality of each voltage tap changer position, verify that the actual tap changer position matches the indicated position, and detect breakage in lead wires and broken strands in multi-strand windings.

[0003] In related technologies, transformer DC resistance testers cannot directly remove the test wires after measuring inductive loads or when the power is turned off, to prevent inductive discharge that could endanger the safety of the tester and the tester. However, there is currently no mechanism to prevent testers from directly removing the test wires. At most, an alarm message is provided, but there is no guarantee that the staff will notice the unexpected situation, and testers may still directly remove the test wires, thus posing a safety hazard. Summary of the Invention

[0004] In order to improve the above-mentioned safety hazard problem, the present application provides a transformer DC resistance tester.

[0005] The present application provides a transformer DC resistance tester that adopts the following technical solution: A transformer DC resistance tester, comprising: A box body, an operation panel, and a connection terminal provided on the operation panel; Limiting mechanism, used to limit the detection line from being pulled out; A driving mechanism for controlling the contact of the limit mechanism with respect to the detection line; The limiting mechanism includes: a limiting plate, movably arranged on the operation panel; A transmission assembly, used to control the movement direction and position of the limit plate; The wiring port and the detection port are both provided on the limit plate, the end of the detection line passes through the wiring port and is connected to the wiring terminal, and the detection port is used for the detection line to pass through; The transmission assembly is used to enable the detection port on the limit plate to move to above the end of the detection line.

[0006] Furthermore, the limiting mechanism further includes: a bracket, slidably disposed on the operation panel; A limiting frame, rotatably arranged on the bracket; A limiting component, used to achieve a buffer distance during the rotation process of the limiting frame; The moving assembly is used to enable the limiting plate to slide on the limiting frame in a vertical direction and be clamped at the lowest position.

[0007] Furthermore, the limiting component includes: A concave block, used to limit the swing distance of the limiting frame; A proximity switch, used to determine whether the limit frame swings and control the sliding operation of the limit plate; The opening direction of the concave block is perpendicular to the rotation axis direction of the limit frame, the concave block cover is arranged at a portion of the distance of the limit frame close to its rotation axis, the bottom surface of the concave block is used to support the bottom surface of the limit frame, the bottom wall of the concave block is provided with a mounting hole, the proximity switch is arranged in the mounting hole and, in an initial state, abuts against the bottom surface of the limit frame.

[0008] Furthermore, the mobile component includes: An electromagnet, used for adsorbing the limit block to an initial position; An elastic portion, used to enable the limiting plate to be elastically arranged in the limiting frame; A clamping portion, used for clamping the limit plate at the bottom; The proximity switch controls the electromagnet to absorb or release the limit plate, and an insulating layer is provided on a portion of the limit plate close to the detection line.

[0009] Furthermore, the clamping portion includes: A plug-in block and a button, a plug-in hole is provided on the bottom side wall of the limit frame, the plug-in hole is set through, the button is slidably adapted in the plug-in hole, the button and the plug-in hole are gap-fitted, and when the plug-in block is plugged into the plug-in hole, the button is pushed out of the plug-in hole.

[0010] Furthermore, the transmission assembly includes: A locking portion, used to lock the sliding operation of the bracket; A control unit, used for controlling the locking unit to trigger operation; The locking portion includes a first rack and a second rack, the first rack slides along with the bracket, the second rack is elastically arranged on the operation panel, and the first rack is meshed with the second rack; The triggering unit includes: a locking block, comprising a horizontal section and a vertical section, wherein the vertical section is fixedly connected to the first rack; A vertical block is provided in a horizontal hole for inserting the horizontal section of the locking block; When the horizontal section of the locking block is inserted into the horizontal hole, the second rack moves toward the first rack.

[0011] Furthermore, the driving mechanism includes: A flip cover is rotatably arranged on the screen of the operation panel and is transparent; The adjusting component can move the bracket only after the flip cover is flipped up and closed in sequence.

[0012] Furthermore, the adjustment component includes: a power rope, used for pulling the second rack to separate from the first rack; A power roller, used for winding and transmitting the other end of the power rope; A locking portion, used for locking the power roller; The winding portion is used for winding the power rope so that the second rack is separated from the first rack.

[0013] Furthermore, the winding portion includes: A winding rod is provided with a winding hole, and the power rope passes through the winding hole; Two mutually perpendicular bevel gears, the two bevel gears meshing with each other, one of which is coaxially fixed to one end of the winding rod, and the other is coaxially fixed to the rotation axis of the flip cover; The winding magnet ring is used to attract or separate the rotating shaft of the flip cover and the corresponding bevel gear.

[0014] Furthermore, the locking portion includes: A friction transmission clutch is used to engage with the end of the power roller to achieve locking; a first gear and a third rack, wherein the first gear is rotatably disposed on the operation panel and is meshed with the third rack, and the third rack is fixedly connected to the friction transmission clutch; The locking magnet ring is used to connect or separate the other end of the flip cover rotation shaft from the first gear.

[0015] In summary, the beneficial technical effects of this application are: 1. During actual operation, it is very easy to encounter the situation where the external device loses power. If the tester directly unplugs the test line at this time, it will be a safety hazard. Therefore, a limit mechanism is used to limit the end of the test line. Only after the test work is completed and safety is guaranteed, the limit of the limit mechanism can be released. After the limit is released by the driving mechanism, the test line can be unplugged; 2. The detection port on the limit plate moves above the end of the detection line. At this time, the detection end cannot pass through the detection port. Therefore, when the staff attempts to pull out the detection line, the limit plate restricts this movement, improving the safety factor. If the tester pulls the detection line, the limit plate will swing and separate from the proximity switch (of course, other smart sensors such as infrared sensors can also be used). At this time, the electromagnet is immediately de-energized, and the limit plate moves downward under the elastic force of the spring until it moves to the bottom position. The plug block is inserted into the plug hole, warning the staff that only manual contact can be used to lock the limit plate, greatly reducing safety hazards. 3. The bracket needs to be moved to ensure that the detection hole is directly above the end of the detection line. After the control slider moves in the slide groove, the locking block moves with the bracket, and the end of the horizontal section of the locking block continues to move along the surface of the vertical block until the horizontal section of the locking block moves to the horizontal hole position. At this time, the second rack moves toward the first rack under the action of the spring, and the horizontal section of the locking block slides in the horizontal hole until the second rack moves to the position engaged with the first rack, thereby achieving the locking effect of the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2 Schematic diagram of the limiting mechanism and driving mechanism of an embodiment of the present application; Figure 3 is a cross-sectional view of the limiting mechanism of an embodiment of the present application; Figure 4 yes Figure 2 A partial enlarged schematic diagram of part A; Figure 5 yes Figure 2 A partial enlarged schematic diagram of part B.

[0017] Description of reference numerals: 1. Box body; 2. Operation panel; 30. Limit plate; 31. Wiring port; 32. Detection port; 4. Bracket; 41. Slider; 42. Slide; 5. Limiting frame; 51. Concave block; 52. Proximity switch; 60. Electromagnet; 61. Elastic portion; 62. Connecting block; 63. Button; 64. Connecting hole; 70. First rack; 71. Second rack; 72. Locking block; 721. Vertical section; 722. Horizontal section; 73. Horizontal hole; 9. Flip cover; 80. Power rope; 81. Power roller; 82. Winding rod; 83. Winding hole; 84. Bevel gear; 85. Winding magnet ring; 86. Friction transmission clutch; 87. First gear; 88. Third rack; 89. Locking magnet ring. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solution of this application in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0019] The present application embodiment discloses a transformer DC resistance tester. Figure 1-Figure 5 , which includes: a box body 1, an operation panel 2 and a terminal provided on the operation panel 2; the test and operation process of the device in this embodiment is mainly to take out the special test line that is randomly equipped, wherein the red and black test pliers are respectively clamped to the two sampling ends of the tested object, and the contact points are rubbed with force, and the other end of the test line is connected to the corresponding terminal of the instrument, and then the test can be started. The limiting mechanism is used to limit the pulling out of the detection line; the driving mechanism is used to control the contact of the limiting mechanism to limit the detection line; because it is very easy to encounter the situation that the external device is powered off during the actual operation, if the tester directly pulls out the detection line at this time, there is a safety hazard, so the end of the detection line is restricted by the limiting mechanism, and only when the test work is completed and safety is guaranteed can the restriction of the limiting mechanism be contacted, and the detection line can be pulled out after the restriction is contacted by the driving mechanism.

[0020] The limiting mechanism includes: a limiting plate 30, which is movably arranged on the operation panel 2; a transmission component for controlling the movement direction and position of the limiting plate 30; a wiring port 31 and a detection port, both of which are arranged on the limiting plate 30, and the end of the detection line passes through the wiring port 31 and is connected to the wiring terminal, and the detection port is used for the detection line to pass through; in this embodiment, the size of the detection port is larger than the size of the wiring port 31 and smaller than the size of the end of the detection line, that is, the detection line can pass through but the detection end cannot be pulled out. Similarly, the size of the wiring port 31 is larger than the size of the detection line end, which can ensure that the detection line end and the wiring terminal are connected. At the same time, in order to ensure convenient wiring in this embodiment, the height position of the limiting plate 30 is higher than the end of the detection line, which is convenient for plugging in the detection line; the transmission component is used to realize the movement of the detection port on the limiting plate 30 to above the end of the detection line. At this time, the detection end cannot pass through the detection port. Therefore, when the staff tries to pull out the detection line, the limiting plate 30 restricts the action to improve the safety factor.

[0021] The limiting mechanism also includes: a bracket 32 ​​detection port; 4, which is slidably arranged on the operation panel 2; a limiting frame 5, which is rotatably arranged on the bracket 32 ​​detection port; 4; a limiting component for achieving a buffer distance during the rotation process of the limiting frame 5; a moving component for achieving the limit plate 30 sliding on the limiting frame 5 in the vertical direction and being clamped at the lowest position to achieve the bracket 32 ​​detection port; 4. The bottom is fixedly connected with a slider 41, and a slide groove 42 is provided on the operation panel 2. The length direction of the slide groove 42 is consistent with the length direction of the limit plate 30. The two ends of the slide groove 42 along the length direction are closed, and the slider 41 and the cross-section of the slider 41 are both set to T-shaped, thereby ensuring that the slider 41 slides in the slide groove 42, and the rotation axis between the limit frame 5 and the bracket 32 ​​detection port; 4 is perpendicular to the length direction of the limit plate 30. If the external power is cut off and the tester still mistakenly operates the movable detectable line, the moving component will be triggered at this time, and the limit plate 30 will move to the lowest position, that is, it will directly abut against the end of the detection line, further locking the detection line to improve safety performance.

[0022] The limit assembly includes: a concave block 51, which is used to limit the swing distance of the limit frame 5; a proximity switch 52, which is used to determine whether the limit frame 5 swings and control the sliding of the limit plate 30; the opening direction of the concave block 51 is perpendicular to the rotation axis direction of the limit frame 5, and the concave block 51 is provided at a portion of the distance between the limit frame 5 and its rotation axis. The bottom surface of the concave block 51 is used to support the bottom surface of the limit frame 5, and the bottom wall of the concave block 51 is provided with a mounting hole, and the proximity switch 52 is provided in the mounting hole. Moreover, in the initial state, it abuts against the bottom surface of the limit frame 5, and the opening direction of the concave block 51 is opposite to the length direction of the limit frame 5. Of course, the rotation axis of the limit frame 5 can also be set in the concave block 51, and the concave block 51 supports the limit frame 5, and as the limit frame 5 swings, the upper surface of the limit frame 5 abuts against the upper side wall of the concave block 51, so the concave block 51 limits the swing position of the limit frame 5, thereby effectively preventing the tester from completely pulling out the test line.

[0023] The moving assembly includes: an electromagnet 60 for adsorbing the limit block to the initial position; an elastic part 61 for realizing the elastic setting of the limit plate 30 in the limit frame 5; a clamping part for clamping the limit plate 30 at the bottom; a proximity switch 52 controls the electromagnet 60 to adsorb or release the limit plate 30. The limit plate 30 is provided with an insulating layer near the detection line. When it is necessary to ensure that the limit plate 30 is at the highest position, the electromagnet 60 is required to adsorb the limit plate 30. However, in order to ensure electrical safety, the limit plate 30 is coated with an insulating layer except for the position where the electromagnet 60 is adsorbed. The elastic part 61 is used to realize the elastic setting of the limit plate 30 in the limit frame 5; the clamping part is used to clamp the limit plate 30 at the bottom; the proximity switch 52 controls the electromagnet 60 to adsorb or release the limit plate 30. The limit plate 30 is provided with an insulating layer near the detection line. When it is necessary to ensure that the limit plate 30 is at the highest position, the electromagnet 60 is required to adsorb the limit plate 30. However, in order to ensure electrical safety, the limit plate 30 is coated with an insulating layer except for the position where the electromagnet 60 is adsorbed. 1 includes multiple springs, which are fixedly connected to the upper surface of the limit frame 5 and the limit plate 30. When the limit plate 30 is attracted by the electromagnet 60, the springs are squeezed and deformed. The connection between the proximity switch 52 and the electromagnet 60 is controlled by a PLC controller. That is, as long as the limit frame 5 is in the working state of the detection line or is plugged into the terminal, if the tester pulls the detection line, the limit plate 30 will swing and separate from the proximity switch 52. At this time, the electromagnet 60 is immediately powered off, and the limit plate 30 moves downward under the elastic force of the spring until it moves to the bottom position and is engaged by the engaging portion.

[0024] The clamping part includes: a plug-in block 62 and a button 63. The bottom side wall of the limit frame 5 is provided with a plug-in hole 64. The plug-in hole 64 is set through. The button 63 slides and fits into the plug-in hole 64. The button 63 and the plug-in hole 64 are clearance-matched. When the plug-in block 62 is plugged into the plug-in hole 64, the button 63 is pushed out of the plug-in hole 64. The limit plate 30 is provided with a plug-in slot. A spring is fixedly connected between one end of the plug-in block 62 located in the plug-in slot and the inner wall of the end of the plug-in slot, and in the initial state, the spring is in a compressed state. The plug-in block 62 is plugged into the plug-in hole 64, thereby realizing the restriction of the limit plate 30. The effect is achieved, and the button 63 is located in the plug hole 64 in the initial state. The length of the button 63 is equal to the depth of the plug hole 64. Therefore, it is only necessary to push the button 63 into the plug hole 64, and the plug block 62 will be squeezed out from the plug hole 64. The main purpose of the above design not using automation but manually controlling the button 63 is to require the tester to know that when the limit plate 30 is stuck, there must be a safety hazard. At this time, electric control cannot be used, and the warning staff can only use manual contact to lock the limit plate 30, thereby greatly reducing the safety hazard.

[0025] The transmission assembly includes: a locking part for locking the detection port of the bracket 32; 4 sliding operation; a control part for controlling the triggering operation of the locking part; the locking part includes a first rack 70 and a second rack 71, the first rack 70 follows the detection port of the bracket 32; 4 sliding, the second rack 71 is elastically arranged on the operation panel 2, the first rack 70 is meshed and connected with the second rack 71, and a plurality of elastic parts are fixedly connected between the back side of the second rack 71 and the operation panel 2, and the elastic parts are set as springs, thereby realizing the elastic effect between the second rack 71 and the operation panel 2, and the movement of the second rack 71 is set along the length direction perpendicular to the limit plate 30.

[0026] The trigger portion includes: a locking block 72, including a horizontal section 722 and a vertical section 721, and the vertical section 721 is fixedly connected to the first rack 70; a vertical block is provided in a horizontal hole 73 for the horizontal section 722 of the locking block 72 to be inserted; when the horizontal section 722 of the locking block 72 is inserted into the horizontal hole 73, the second rack 71 moves toward the first rack 70; when the insertion work of the detection line is completed, it is necessary to move the bracket 32 ​​to detect the port; 4, thereby ensuring that the detection hole is directly above the end of the detection line, and the control slider 41 is in the slide groove After moving in the interior of 42, the locking block 72 moves with the detection port 4 of the bracket 32, and the end of the horizontal section 722 of the locking block 72 continues to move along the surface of the vertical block until the horizontal section 722 of the locking block 72 moves to the position of the horizontal hole 73. At this time, the second rack 71 moves toward the first rack 70 under the action of the spring, and the horizontal section 722 of the locking block 72 slides in the horizontal hole 73 until the second rack 71 moves to the position engaged with the first rack 70, thereby achieving a locking effect on the detection port 4 of the bracket 32.

[0027] The driving mechanism includes: a flip cover 9, which is rotatably arranged at the screen on the operation panel 2 and is transparent; an adjusting component, which realizes that the bracket 32 ​​detection port can only be moved after the flip cover 9 is flipped up and closed in sequence; 4. In this embodiment, if the external power is cut off, the data of the external power cut will be displayed on the display screen, but because the staff will not pay attention to the situation of the display screen, the staff is required to forcibly look at the data on the display screen. In this embodiment, the flip cover 9 must be flipped twice before the limit plate 30 can be unlocked. During these two flip cover 9 actions, it is set that the staff will observe and notice the data such as the fault on the display screen, which also has a warning effect. Compared with the existing technology of reminding the staff through warning lights or warning sounds, the operation of this embodiment is more efficient, and it is forced to require that the staff can only unlock the door after looking at the fault data on the display screen, thereby achieving the effect of improving safety performance.

[0028] The adjustment assembly includes: a power rope 80 for pulling the second rack 71 to separate from the first rack 70; a power roller 81 for winding the other end of the power rope 80; a locking portion for locking the power roller 81; a winding portion for winding the power rope 80 so that the second rack 71 is separated from the first rack 70, and the power roller 81 is used to wind the power rope 80, and in the initial state and during operation, the power rope 80 is always in a straight state. When the second rack 71 moves toward the first rack 70, the power roller 81 releases the power rope 80, so when it is necessary to pull back the second rack 71, this embodiment The locking part is mainly used to lock the power roller 81, and then the winding part is used to wind the power rope 80, so that the power rope 80 will also be retracted, thereby pulling the second rack 71 back to a position away from the first rack 70. The reason why this embodiment does not use the power roller 81 to directly wind the power rope 80 is mainly because the staff is required to flip the flip cover 9 twice, that is, to open and close it. In this case, it is impossible to directly control the power roller 81. If it needs to be realized, a more complex mechanical transmission structure needs to be adopted, resulting in cost waste. Therefore, it is sufficient to set the winding part to wind it, which is low-cost and simple in structure.

[0029] The winding part includes: a winding rod 82, which is provided with a winding hole 83, and the power rope 80 passes through the winding hole 83; two mutually perpendicular bevel gears 84, the two bevel gears 84 are meshed with each other, and one of them is coaxially fixed with one end of the winding rod 82, and the other is coaxially fixed with the rotating shaft of the flip cover 9; a winding magnet ring 85, which is used to adsorb or separate the rotating shaft of the flip cover 9 and the corresponding bevel gear 84. The length of the winding rod 82 is perpendicular to the power rope 80 or the angle between it and the power rope 80 is an obtuse angle, so the winding rod 82 can wind the power rope 80. The aperture of the winding hole 83 is larger than the diameter of the power rope 80 and less than twice the diameter, so it is convenient for the winding hole 83 to start winding the power rope 80. One bevel gear 84 is coaxially fixed with the rotating shaft of the flip cover 9. At this time, the other bevel gear 84 can control the rotation of the winding rod 82. The whole structure is simple and the operation is simple, and the magnet ring only needs to control whether it is connected to the corresponding bevel gear 84 and the rotating shaft of the flip cover 9.

[0030] The locking part includes: a friction transmission clutch 86, which is used to fit with the end of the power roller 81 to achieve locking; a first gear 87 and a third rack 88, the first gear 87 is rotatably set on the operation panel 2, and is meshed with the third rack 88, and the rack is fixedly connected to the friction transmission clutch 86; a locking magnet ring 89, which is used to connect or separate the other end of the rotating shaft of the flip cover 9 with the first gear 87. The main function of the friction transmission clutch 86 is to increase the friction force of the contact surface, thereby achieving the connection of the two end faces. Therefore, the axial direction of the power roller 81 is set along the movement direction of the third rack 88. The locking magnet ring 89 can also realize whether the other end of the rotating shaft of the flip cover 9 is connected to the first gear 87, thereby controlling whether the rack moves or not.

[0031] When it is necessary to release the restriction effect of the restriction plate, the flip cover 9 is controlled to start opening, and the locking magnet ring 89 is energized at the same time, the first gear 87 is connected to the end of the corresponding flip cover 9 rotation shaft, and the flip cover 9 drives the first gear 87 to rotate together, and the rack moves to fit the friction transmission clutch 86 with the end of the power roller 81, thereby achieving the restriction effect on the rotation of the power roller 81. During the whole process, even if the locking magnet ring 89 is powered off, the position of the rack will not move, and the friction transmission clutch 86 will always fit with the power roller 81, and the power roller 81 will not The power roller 81 is locked and the flip cover 9 is closed. After the locking magnet ring 89 is powered off and the winding magnet ring 85 is powered on, the other end of the rotating shaft of the flip cover 9 is connected to the corresponding bevel gear 84. Then, under the transmission action of the two bevel gears 84, the winding rod 82 rotates, and the power rope 80 is wound around the winding hole 83, so that the second rack 71 can be pulled back to the position separated from the first rack 70. At this time, the movement of the limit plate 30 is released, and the limit plate 30 can be controlled to move to the initial position, and the detection line can be removed.

[0032] Similarly, if you want the power rope 80 to return to its initial state, you can continue to control the winding rod 82 to flip, that is, when the flip cover 9 is opened, the rotating shaft of the flip cover 9 is still connected to the bevel gear 84, so that the power rope 80 wrapped around the winding rod 82 is released, and then the first gear 87 is connected to the rotating shaft of the flip cover 9, so that the friction transmission clutch 86 is separated from the power roller 81, the lock of the power roller 81 is released, and the power rope 80 can be started.

[0033] The implementation principle of a transformer DC resistance tester in an embodiment of the present application is as follows: the detection port on the limit plate 30 moves to above the end of the detection line. At this time, the detection end cannot pass through the detection port. Therefore, when the staff tries to pull out the detection line, the limit plate 30 limits the action, thereby improving the safety factor; if the tester pulls the detection line, the limit plate 30 will swing and separate from the proximity switch 52. At this time, the electromagnet 60 is immediately powered off, and the limit plate 30 moves downward under the elastic force of the spring until it moves to the bottom position. The plug-in block 62 is plugged into the plug-in hole 64, warning the staff that they can only use manual contact to lock the limit plate 30, thereby greatly reducing safety hazards.

[0034] It is necessary to move the bracket 32 ​​detection port; 4, and then ensure that the detection hole is directly above the end of the detection line. After the control slider 41 moves in the slide groove 42, the locking block 72 moves with the bracket 32 ​​detection port; 4, and the end of the horizontal section 722 of the locking block 72 continues to move along the surface of the vertical block until the horizontal section 722 of the locking block 72 moves to the position of the horizontal hole 73. At this time, the second rack 71 moves toward the first rack 70 under the action of the spring, and the horizontal section 722 of the locking block 72 slides in the horizontal hole 73 until the second rack 71 moves to the position engaged with the first rack 70, thereby achieving a locking effect on the bracket 32 ​​detection port; 4.

[0035] When it is necessary to release the restriction effect of the restriction plate, the flip cover 9 is controlled to start opening, and the locking magnet ring 89 is energized at the same time, the gear is connected to the end of the corresponding flip cover 9 rotation shaft, and the flip cover 9 drives the first gear 87 to rotate together, and the rack moves to fit the friction transmission clutch 86 with the end of the power roller 81, thereby achieving the restriction effect on the rotation of the power roller 81. During the whole process, even if the locking magnet ring 89 is powered off, the position of the rack will not move, and the friction transmission clutch 86 will always fit with the power roller 81, and the power roller 81 will not move. Rotate to achieve the locking effect of the power roller 81; then close the flip cover 9, cut off the power to the locking magnet ring 89 and energize the winding magnet ring 85, the other end of the rotating shaft of the flip cover 9 is connected to the corresponding bevel gear 84, and then under the transmission action of the two bevel gears 84, the winding rod 82 rotates, and the power rope 80 is wound around the winding hole 83, and then the second rack 71 can be pulled back to the position separated from the first rack 70. At this time, the movement of the limit plate 30 is released, and the limit plate 30 can be controlled to move to the initial position, and the detection line can be removed.

[0036] Unless otherwise defined, the technical or scientific terms used in this application shall have the usual meanings understood by persons of ordinary skill in the field to which this application belongs. The words "first", "second", "third" and similar terms used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprises" cover the elements or objects listed after "include" or "comprises" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A transformer DC resistance tester, characterized in that: include: A box body (1), an operation panel (2), and a connection terminal provided on the operation panel (2); Limiting mechanism, used to limit the detection line from being pulled out; A driving mechanism for controlling the contact of the limit mechanism with respect to the detection line; The limiting mechanism includes: A limit plate (30) movably arranged on the operating panel (2); A transmission assembly for controlling the movement direction and position of the limit plate (30); The wiring port (31) and the detection port are both provided on the limiting plate (30), and the end of the detection line passes through the wiring port (31) and is connected to the wiring terminal, and the detection port is used for the detection line to pass through; The transmission assembly is used to enable the detection port on the limit plate (30) to move to above the end of the detection line.

2. A transformer DC resistance tester according to claim 1, characterized in that: The limiting mechanism also includes: A bracket (32 detection port; 4) is slidably arranged on the operation panel (2); A limiting frame (5) is rotatably mounted on the bracket (32 detection port; 4); A limiting component, used to achieve a buffer distance during the rotation process of the limiting frame (5); The moving assembly is used to enable the limiting plate (30) to slide on the limiting frame (5) in a vertical direction and be clamped at the lowest position.

3. A transformer DC resistance tester according to claim 2, characterized in that: The limiting component includes: A concave block (51) is used to limit the swing distance of the limiting frame (5); A proximity switch (52) is used to determine whether the limit frame (5) is swinging and to control the sliding operation of the limit plate (30); The opening direction of the concave block (51) is perpendicular to the rotation axis direction of the limit frame (5), and the concave block (51) is arranged on a portion of the limit frame (5) close to its rotation axis. The bottom surface of the concave block (51) is used to support the bottom surface of the limit frame (5). The bottom wall of the concave block (51) is provided with a mounting hole. The proximity switch (52) is arranged in the mounting hole and, in an initial state, abuts against the bottom surface of the limit frame (5).

4. A transformer DC resistance tester according to claim 3, characterized in that: The mobile component includes: An electromagnet (60) is used to adsorb the limit block to an initial position; An elastic portion (61) is used to enable the limiting plate (30) to be elastically arranged in the limiting frame (5); A clamping portion, used for clamping the limiting plate (30) at the bottom; The proximity switch (52) controls the electromagnet (60) to absorb or release the limit plate (30), and the limit plate (30) is provided with an insulating layer near the detection line.

5. A transformer DC resistance tester according to claim 4, characterized in that: The clamping portion includes: The plug-in block (62) and the button (63) are provided on the bottom side wall of the limiting frame (5). The plug-in hole (64) is provided through the limiting frame (5). The button (63) is slidably adapted in the plug-in hole (64). The button (63) and the plug-in hole (64) are clearance-matched. When the plug-in block (62) is plugged into the plug-in hole (64), the button (63) is pushed out of the plug-in hole (64).

6. A transformer DC resistance tester according to claim 5, characterized in that: The transmission assembly comprises: A locking portion for locking the sliding operation of the bracket (32 detection port; 4); A control unit, used for controlling the locking unit to trigger operation; The locking portion includes a first rack (70) and a second rack (71), wherein the first rack (70) slides following the bracket (32 detection port; 4), and the second rack (71) is elastically arranged on the operation panel (2), and the first rack (70) and the second rack (71) are meshed and connected; The triggering unit includes: A locking block (72) comprising a horizontal section (722) and a vertical section (721), wherein the vertical section (721) is fixedly connected to the first rack (70); A vertical block, provided in a horizontal hole (73) for inserting the horizontal section (722) of the locking block (72); When the horizontal section (722) of the locking block (72) is inserted into the horizontal hole (73), the second rack (71) moves toward the first rack (70).

7. A transformer DC resistance tester according to claim 3, characterized in that: The driving mechanism comprises: A flip cover (9) is rotatably arranged on the screen of the operation panel (2) and is transparent; The adjusting component is used to realize that the bracket (32 detection port; 4) can only be moved after the flip cover (9) flips up and closes in sequence.

8. A transformer DC resistance tester according to claim 7, characterized in that: The adjustment component includes: A power rope (80) is used to pull the second rack (71) to separate from the first rack (70); A power roller (81) for winding the other end of the power rope (80); A locking portion, used for locking the power roller (81); The winding portion is used for winding the power rope (80) so that the second rack (71) is separated from the first rack (70).

9. A transformer DC resistance tester according to claim 8, characterized in that: The winding portion includes: A winding rod (82) is provided with a winding hole (83), and the power rope (80) passes through the winding hole (83); Two mutually perpendicular bevel gears (84), the two bevel gears (84) meshing with each other, one of which is coaxially fixed to one end of the winding rod (82), and the other is coaxially fixed to the rotation axis of the flip cover (9); The winding magnet ring (85) is used to absorb or separate the rotating shaft of the flip cover (9) and the corresponding bevel gear (84).

10. A transformer DC resistance tester according to claim 9, characterized in that: The locking portion includes: A friction transmission clutch (86) is used to engage with the end of the power roller (81) to achieve locking; a first gear (87) and a third rack (88), wherein the first gear (87) is rotatably disposed on the operating panel (2) and is meshedly connected to the third rack (88), and the third rack (88) is fixedly connected to the friction transmission clutch (86); The locking magnet ring (89) is used to connect or disconnect the other end of the rotating shaft of the flip cover (9) from the first gear (87).

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