A transformer DC resistance tester

Abstract

The application relates to a transformer DC resistance tester, which comprises a box body, an operation panel, a wiring end arranged on the operation panel, a limiting mechanism for limiting the pulling-out of a detection line, and a driving mechanism for controlling the limiting mechanism to contact and limit the detection line. The limiting mechanism comprises a limiting plate movably arranged on the operation panel, a transmission assembly for controlling the movement direction and position of the limiting plate, a wiring port and a detection port, both arranged on the limiting plate, a detection line end connected with the wiring end through the wiring port, and the detection port for the detection line to pass through. The transmission assembly is used for realizing the movement of the detection port on the limiting plate to above the detection line end. The application limits the detection line, thereby realizing the effect of improving the safety performance after external power-off.

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

[0002] At present, the transformer DC resistance is a necessary measurement item in the semi-finished product, finished product delivery test, installation, overhaul, change of tap changer, handover test and preventive test of the power department in transformer manufacturing. The transformer DC resistance tester can check the welding quality of the winding joint and whether there is a turn-to-turn short circuit in the winding, can detect whether the contact of each position of the voltage tap changer is good and whether the actual position of the tap changer is consistent with the indicated position, whether the lead wire is broken, whether the multi-strand wire is broken, and the like.

[0003] In the related art, the transformer DC resistance tester cannot directly disassemble the detection line after measuring the inductive load or external power failure, so as to avoid the inductive discharge endangering the safety of the tester and the tester. However, there is no structure to prevent the tester from directly disassembling the detection line at present, and at most, an alarm information is set, but it cannot guarantee whether the staff notices the unexpected situation, and the situation of the tester directly disassembling the detection line still occurs, so that there is still a safety hazard. SUMMARY

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

[0005] The transformer DC resistance tester provided by the present application adopts the following technical scheme:

[0006] A transformer DC resistance tester, comprising:

[0007] a box body, an operation panel and a wiring terminal arranged on the operation panel;

[0008] a limiting mechanism for limiting the pulling out of the detection line;

[0009] a driving mechanism for controlling the limiting mechanism to release the limitation on the detection line;

[0010] The limiting mechanism comprises:

[0011] a limiting plate movably arranged on the operation panel;

[0012] a transmission assembly for controlling the movement direction and position of the limiting plate;

[0013] a wiring port and a detection port, both arranged on the limiting plate, the end of the detection line is connected with the wiring terminal through the wiring port, and the detection port is used for the detection line to pass through;

[0014] The transmission assembly is used to realize the movement of the detection port on the limiting plate to above the end of the detection line.

[0015] Further, the limiting mechanism further comprises:

[0016] A support is slidingly arranged on the operation panel.

[0017] A limiting support is rotatably arranged on the support.

[0018] A limiting assembly is used to realize the buffering distance of the rotation process of the limiting support.

[0019] A moving assembly is used to realize the sliding of the limiting plate on the limiting support in the vertical direction and to be clamped at the lowest position.

[0020] Further, the limiting assembly comprises:

[0021] A concave block is used to limit the swing distance of the limiting support.

[0022] A proximity switch is used to determine whether the limiting support swings and to control the sliding work of the limiting plate.

[0023] The opening direction of the concave block is perpendicular to the rotation axis direction of the limiting support, the concave block is arranged at a distance close to the rotation axis of the limiting support, the bottom surface of the concave block is used to support the bottom surface of the limiting support, the bottom wall of the concave block is provided with a mounting hole, the proximity switch is arranged in the mounting hole and abuts against the bottom surface of the limiting support in the initial state.

[0024] Further, the moving assembly comprises:

[0025] An electromagnet is used to attract the limiting block to the initial position.

[0026] An elastic part is used to realize the elastic arrangement of the limiting plate in the limiting support.

[0027] A clamping part is used to clamp the limiting plate at the bottom.

[0028] The proximity switch controls the electromagnet to attract or release the limiting plate, and the limiting plate close to the detection line part is provided with an insulating layer.

[0029] Further, the clamping part comprises:

[0030] A plug-in block and a button, the sidewall of the bottom of the limiting support is provided with a plug-in hole, the plug-in hole is through, the button is slidingly fitted in the plug-in hole, the button is gap-fitted with the plug-in hole, and the button is pushed out of the plug-in hole when the plug-in block is inserted into the plug-in hole.

[0031] Further, the transmission assembly comprises:

[0032] A locking part for locking the sliding operation of the support;

[0033] A control part for controlling the triggering operation of the locking part;

[0034] The locking part comprises a first rack and a second rack, the first rack slides with the support, the second rack is elastically arranged on the operation panel, and the first rack is in meshing connection with the second rack;

[0035] The triggering part comprises:

[0036] A locking block comprising a horizontal segment and a vertical segment, and the vertical segment is fixedly connected with the first rack;

[0037] A vertical block arranged in a horizontal hole for plugging the horizontal segment of the locking block;

[0038] When the horizontal segment of the locking block is plugged into the horizontal hole, the second rack moves towards the first rack.

[0039] Further, the driving mechanism comprises:

[0040] A flip cover transparently arranged at a screen on the operation panel;

[0041] An adjusting assembly for moving the support after the flip-up and cover-up actions of the flip cover are sequentially completed.

[0042] Further, the adjusting assembly comprises:

[0043] A power rope for pulling the second rack away from the first rack;

[0044] A power roller for winding the other end of the power rope;

[0045] A locking part for locking the power roller;

[0046] A winding part for winding the power rope to separate the second rack from the first rack.

[0047] Further, the winding part comprises:

[0048] A winding rod provided with a winding hole, and the power rope passes out of the winding hole;

[0049] Two bevel gears perpendicular to each other, the two bevel gears are in meshing connection, one of the two bevel gears is coaxially fixed with one end of the winding rod, and the other bevel gear is coaxially fixed with a rotating shaft of the flip cover;

[0050] The winding magnet ring is used for adsorbing or separating the rotating shaft of the flip cover and the corresponding bevel gear.

[0051] Further, the locking part comprises:

[0052] The friction transmission clutch is used for realizing the locking with the end of the power roller.

[0053] The first gear is rotationally arranged on the operation panel and is in meshing connection with the third rack, and the third rack is fixedly connected with the friction transmission clutch.

[0054] The locking magnet ring is used for realizing the connection or separation of the other end of the rotating shaft of the flip cover and the first gear.

[0055] Therefore, the application has the following beneficial technical effects:

[0056] 1. Since the power supply of external equipment is easily interrupted in actual operation, if the tester directly pulls out the detection line at this time, there is a safety hazard, therefore, the end of the detection line is limited by the limiting mechanism, and the limiting mechanism is released only when the test is completed and the safety is ensured, and the detection line can be pulled out after the limiting mechanism is released by the driving mechanism;

[0057] 2. The detection port on the limiting plate moves above the end of the detection line, and the detection end cannot pass through the detection port at this time, therefore, when the worker tries to pull out the detection line, the limiting plate limits this action to improve the safety factor; if the tester pulls the detection line, the limiting plate will swing and be separated from the proximity switch, and the electromagnet is immediately powered off at this time, the limiting plate moves downward under the elastic force of the spring, and the plug-in block is plugged into the plug-in hole when it moves to the bottom position, warning the worker to manually release the locking of the limiting plate, thereby greatly reducing the safety hazard;

[0058] 3. The support needs to be moved to ensure that the detection hole is opposite to the upper part of the end of the detection line, and after the control slider moves in the sliding groove, the locking block moves together with the support, and the end of the horizontal section of the locking block always moves 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, the horizontal section of the locking block slides in the horizontal hole until the second rack moves to the position meshing with the first rack, thereby achieving the locking effect of the support. BRIEF DESCRIPTION OF DRAWINGS

[0059] Figure 1 is a schematic view of the overall structure of the embodiment of the application;

[0060] Figure 2 is a schematic view of the limiting mechanism and the driving mechanism of the embodiment of the application;

[0061] Figure 3 is a sectional view of a limiting mechanism of an embodiment of the present application;

[0062] Figure 4 is a sectional view of a limiting mechanism of an embodiment of the present application; Figure 2 is a partial enlarged view of part A in

[0063] Figure 5 is a partial enlarged view of part B in Figure 2

[0064] Legend of reference signs:

[0065] 1, box body;

[0066] 2, operation panel;

[0067] 30, limiting plate; 31, wiring port; 32, detection port;

[0068] 4, support; 41, sliding block; 42, sliding slot;

[0069] 5, limiting frame; 51, concave block; 52, proximity switch;

[0070] 60, electromagnet; 61, elastic part; 62, plug-in block; 63, button; 64, plug-in hole;

[0071] 70, first rack; 71, second rack; 72, locking block; 721, vertical section; 722, horizontal section; 73, horizontal hole; 9, flip cover;

[0072] 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

[0073] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0074] The embodiments of the present application disclose a transformer DC resistance tester. With reference to the drawings, Figures 1-5 ​It comprises a box body 1, an operation panel 2 and a wiring terminal arranged on the operation panel 2; in the present embodiment, the testing and operation process of the device mainly comprises the following steps: taking out the special test line equipped at random, clamping the red and black test forceps to the two sampling ends of the tested product respectively, rubbing the contact points with force, connecting the other end of the test line with the wiring terminal of the instrument, and then starting the test. The limiting mechanism is used for limiting the test line from being pulled out; the driving mechanism is used for controlling the limiting mechanism to release the limitation on the test line; since the power failure of the external equipment is likely to occur in the actual operation process, if the tester directly pulls out the test line at this time, there is a safety hazard, therefore, the end of the test line is limited by the limiting mechanism, and the limitation of the limiting mechanism is released under the premise of ensuring safety after the test work is completed, and the test line can be pulled out after the limitation is released by the driving mechanism.

[0075] The limiting mechanism comprises a limiting plate 30 movably arranged on the operation panel 2, a transmission assembly for controlling the movement direction and position of the limiting plate 30, a wiring port 31 and a detection port both arranged on the limiting plate 30, the end of the test line passing through the wiring port 31 and connected with the wiring terminal, and the detection port for the test line to pass through; in the present embodiment, the size of the detection port is greater than the size of the wiring port 31 and less than the size of the end of the test line, that is, the test line can pass through but the test end cannot be pulled out, and similarly, the size of the wiring port 31 is greater than the size of the end of the test line, which can ensure that the end of the test line is connected with the wiring terminal, and in the present embodiment, in order to ensure the convenience of wiring, the height position of the limiting plate 30 is higher than the end of the test line, which is convenient for plugging the test line; the transmission assembly is used for realizing the movement of the detection port on the limiting plate 30 to above the end of the test line, at this time, the test end cannot pass through the detection port, therefore, when the staff tries to pull out the test line, the limiting plate 30 limits this action, which improves the safety factor.

[0076] The limiting mechanism further comprises a support 4 slidably arranged on the operation panel 2, a limiting frame 5 rotatably arranged on the support 4, a limiting assembly for realizing the buffer distance of the rotation process of the limiting frame 5, and a moving assembly for realizing the sliding of the limiting plate 30 on the limiting frame 5 in the vertical direction and being clamped at the lowest position, the bottom of the support 4 is fixedly connected with a sliding block 41, the operation panel 2 is provided with a sliding groove 42, the length direction of the sliding groove 42 is consistent with the length direction of the limiting plate 30, the both ends of the sliding groove 42 along the length direction are closed, the sliding block 41 and the cross section of the sliding block 41 are both arranged in T shape, thereby ensuring the sliding of the sliding block 41 in the sliding groove 42, and the rotation axis between the limiting frame 5 and the support 4 is perpendicular to the length direction of the limiting plate 30; if the tester still mistakenly moves the test line after the power failure of the external equipment, at this time, the moving assembly is triggered, the limiting plate 30 moves to the lowest position, that is, directly abuts against the end of the test line, further locks the test line, and improves the safety performance.

[0077] The limiting assembly comprises a concave block 51 for limiting the swing distance of the limiting frame 5, a proximity switch 52 for judging whether the limiting frame 5 swings and controlling the sliding work of the limiting plate 30, the opening direction of the concave block 51 is perpendicular to the rotating axis direction of the limiting frame 5, the concave block 51 is arranged on the part of the limiting frame 5 close to the rotating axis, the bottom surface of the concave block 51 is used for supporting the bottom surface of the limiting 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 abuts against the bottom surface of the limiting frame 5 in the initial state, the opening direction of the concave block 51 is opposite to the length direction of the limiting frame 5, of course, the rotating axis of the limiting frame 5 can be arranged in the concave block 51, and the concave block 51 plays a supporting effect on the limiting frame 5, and the upper surface of the limiting frame 5 abuts against the upper wall of the concave block 51 with the swing of the limiting frame 5, so that the concave block 51 limits the swing position of the limiting frame 5, thereby effectively avoiding that the tester pulls out the detection line completely.

[0078] The moving assembly comprises an electromagnet 60 for attracting the limiting block to the initial position, an elastic part 61 for elastically arranging the limiting plate 30 in the limiting frame 5, a clamping part for clamping the limiting plate 30 at the bottommost position, and the proximity switch 52 controls the electromagnet 60 to attract or release the limiting plate 30, and the part of the limiting plate 30 close to the detection line is provided with an insulating layer, when it is needed to ensure that the limiting plate 30 is located at the highest position, the electromagnet 60 is needed to attract the limiting plate 30, but in order to ensure the safety of electricity, the limiting plate 30 is coated with an insulating layer except the position attracted by the electromagnet 60, the elastic part 61 comprises a plurality of springs, the springs are fixedly connected with the upper surface of the limiting frame 5 and the limiting plate 30, when the limiting plate 30 is attracted by the electromagnet 60, the springs are extruded and deformed, the proximity switch 52 and the electromagnet 60 are connected through the PLC controller, that is, as long as the limiting frame 5 is in the working state at the detection line or is inserted into the wiring end, if the tester pulls the detection line, the limiting plate 30 swings and is separated from the proximity switch 52, at this time, the electromagnet 60 is immediately powered off, the limiting plate 30 moves downward under the elastic force of the spring and is clamped by the clamping part when it moves to the bottommost position.

[0079] The clamping part comprises a plug-in block 62 and a button 63, the bottom side wall of the limiting frame 5 is provided with a plug-in hole 64, the plug-in hole 64 is provided in a penetrating manner, the button 63 is slidably fitted in the plug-in hole 64, the button 63 is in clearance fit with the plug-in hole 64, the button 63 is pushed out of the plug-in hole 64 when the plug-in block 62 is plugged into the plug-in hole 64, the limiting plate 30 is provided with a plug-in groove, one end of the plug-in block 62 located in the plug-in groove is fixedly connected with a spring between the end wall of the plug-in groove, and the spring is in a compressed state in the initial state, the plug-in block 62 is plugged into the plug-in hole 64, thereby realizing the limiting effect of the limiting plate 30, and the button 63 is located in the plug-in hole 64 in the initial state, the length of the button 63 is equal to the depth of the plug-in hole 64, so that only the button 63 needs to be pushed into the plug-in hole 64, and the plug-in block 62 will be squeezed out of the plug-in hole 64, the main purpose of the above design is that the manual control button 63 is not automatic, but the main purpose is that the tester needs to know that the limiting plate 30 is stuck, which means that there is a safety hazard, so at this time, the electric control cannot be used, and the staff can only use manual to release the locking of the limiting plate 30, thereby greatly reducing the safety hazard effect.

[0080] The transmission assembly comprises a locking part for locking the sliding work of the support 4, and a control part for controlling the triggering work of the locking part, the locking part comprises a first rack 70 and a second rack 71, the first rack 70 slides with the support 4, the second rack 71 is elastically arranged on the operation panel 2, the first rack 70 is in meshing connection with the second rack 71, a plurality of elastic members are fixedly connected between the back surface of the second rack 71 and the operation panel 2, and the elastic members are 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 arranged perpendicular to the length direction of the limiting plate 30.

[0081] The triggering part comprises a locking block 72 comprising a horizontal section 722 and a vertical section 721, and the vertical section 721 is fixedly connected with the first rack 70, a vertical block is arranged in a horizontal hole 73 for inserting the horizontal section 722 of the locking block 72, the second rack 71 moves towards the first rack 70 when the horizontal section 722 of the locking block 72 is inserted into the horizontal hole 73, when the plug-in work of the detection line is completed, the support 4 needs to be moved at this time, thereby ensuring that the detection hole is opposite to the upper side of the end of the detection line, after the control sliding block 41 moves in the sliding groove 42, the locking block 72 moves with the support 4, and the end of the horizontal section 722 of the locking block 72 always moves 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 towards the first rack 70 under the action of the spring, the horizontal section 722 of the locking block 72 slides in the horizontal hole 73, until the second rack 71 moves to the position of meshing with the first rack 70, thereby realizing the locking effect of the support 4.

[0082] The driving mechanism comprises: a flip cover 9, which is transparent and arranged at the screen of the operation panel 2; and an adjusting assembly, which is configured to move the support 4 after the flip cover 9 is opened and closed in sequence. In this embodiment, if the external power is cut off, the data of the external power cut-off will be displayed on the display screen. However, the staff will not pay attention to the display screen, and thus the staff needs to forcibly check the data on the display screen. In this embodiment, the flip cover 9 must be opened twice before the limiting plate 30 is unlocked. During the two opening processes of the flip cover 9, the staff will observe and notice the data on the display screen, thereby achieving the warning effect. Compared with the prior art, the operation of this embodiment is more efficient. The staff must check the fault data on the display screen before the limiting plate 30 is unlocked, thereby achieving the effect of improving the safety performance.

[0083] The adjusting assembly comprises: a power rope 80, which is configured to pull the second rack 71 away from the first rack 70; a power roller 81, which is configured to wind the other end of the power rope 80; a locking part, which is configured to lock the power roller 81; and a winding part, which is configured to wind the power rope 80 to separate the second rack 71 from the first rack 70. The power roller 81 is configured to wind the power rope 80. In the initial state and during the operation, the power rope 80 is always in a straight state. When the second rack 71 moves towards the first rack 70, the power roller 81 releases the power rope 80. Therefore, when the second rack 71 needs to be pulled back, the locking part is mainly used to lock the power roller 81 in this embodiment, and then the winding part is used to wind the power rope 80. In this way, the power rope 80 is also retracted, thereby achieving the effect of pulling the second rack 71 back to a position away from the first rack 70. The reason why the power roller 81 is not directly used to wind the power rope 80 in this embodiment is that the staff needs to open and close the flip cover 9 twice. In this way, the power roller 81 cannot be directly controlled. If the power roller 81 needs to be controlled, a more complex mechanical transmission structure needs to be used, which causes waste of cost. Therefore, the winding part is used to wind, which is low in cost and simple in structure.

[0084] The winding part comprises a winding rod 82 provided with a winding hole 83, and the power cord 80 is threaded out of the winding hole 83; two mutually perpendicular bevel gears 84, the two bevel gears 84 are mutually engaged, 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 for attracting or separating 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 cord 80 or the included angle between the winding rod 82 and the power cord 80 is obtuse, so that the winding rod 82 can wind the power cord 80, the hole diameter of the winding hole 83 is greater than the diameter of the power cord 80 and less than twice the diameter, so that the winding hole 83 can conveniently begin to wind the power cord 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 also simple, and the magnet ring only needs to control whether it is connected with the corresponding bevel gear 84 and the rotating shaft of the flip cover 9.

[0085] The locking part comprises a friction drive clutch 86 for abutting with the end of the power roller 81 to realize locking; a first gear 87 and a third rack 88, the first gear 87 is rotationally arranged on the operation panel 2 and is in meshing connection with the third rack 88, the rack is fixedly connected with the friction drive clutch 86; a locking magnet ring 89 for realizing the connection or separation of the other end of the rotating shaft of the flip cover 9 with the first gear 87, the main function of the friction drive clutch 86 is to increase the friction force of the contact surface, so that the connection of the two end surfaces can be realized, so the axis direction of the power roller 81 is arranged 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 with the first gear 87, so as to realize the control of whether the rack moves.

[0086] When it is needed to release the limiting effect of the limiting plate, at this time the flip cover 9 starts to open, and the locking magnet ring 89 is electrified to connect the first gear 87 with the end of the rotating shaft of the corresponding flip cover 9, the flip cover 9 drives the first gear 87 to rotate, the rack moves to abut the friction drive clutch 86 with the end of the power roller 81, and then the limiting effect of the rotation of the power roller 81 is realized, and in the whole process, even if the locking magnet ring 89 is de-energized, the position of the rack will not move, and then the friction drive clutch 86 is always abutted with the power roller 81, so that the power roller 81 will not rotate, and the locking effect of the power roller 81 is realized; then the flip cover 9 is closed, after the locking magnet ring 89 is de-energized and the winding magnet ring 85 is electrified, the other end of the rotating shaft of the flip cover 9 is connected with the corresponding bevel gear 84, and then under the transmission of the two bevel gears 84, the winding rod 82 rotates, the power cord 80 is wound at the position of the winding hole 83, and then the second rack 71 can be pulled back to a position separated from the first rack 70, at this time the movement of the limiting plate 30 is released, and after the limiting plate 30 can be controlled to move to the initial position, the detection line can be removed.

[0087] Similarly, if the power cord 80 also returns to the initial state, the winding rod 82 can continue to be controlled to flip, that is, when the flip cover 9 is opened, the rotating shaft of the flip cover 9 is still connected with the bevel gear 84, so that the power cord 80 wound on the winding rod 82 is unwound, and then the first gear 87 is connected with the rotating shaft of the flip cover 9, so that the friction clutch 86 is separated from the power roller 81, the locking of the power roller 81 is released, and the winding of the power cord 80 can be started.

[0088] The implementation principle of the transformer DC resistance tester provided in the embodiment of the application is as follows: the detection port of the limiting plate 30 moves to above the end portion of the detection line, at this time, the detection end cannot pass through the detection port, so when the worker tries to pull out the detection line, the limiting plate 30 limits this action, thereby improving the safety factor; if the tester pulls the detection line, at this time, the limiting plate 30 swings and is separated from the proximity switch 52, at this time, the electromagnet 60 is immediately powered off, the limiting plate 30 moves downward under the elastic force of the spring, and when the limiting plate 30 moves to the bottommost position, the plug-in block 62 is plugged into the plug-in hole 64, thereby warning the worker that the locking of the limiting plate 30 can only be manually released, thereby achieving the effect of greatly reducing the safety hazard.

[0089] The support 4 needs to be moved, and then the detection hole is ensured to be opposite to above the end portion of the detection line. After the sliding block 41 moves in the sliding groove 42, the locking block 72 moves together with the support 4, and the end portion of the horizontal section 722 of the locking block 72 always moves along the surface of the vertical block. When 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, the horizontal section 722 of the locking block 72 slides in the horizontal hole 73, and then the second rack 71 moves to the position of the first rack 70, thereby achieving the locking effect of the support 4.

[0090] When the limiting effect of the limiting plate needs to be released, the flip cover 9 starts to open at this time, and the locking magnet ring 89 is powered on at the same time, the gear is connected with the end of the corresponding flip cover 9 rotating shaft, the flip cover 9 drives the first gear 87 to rotate, the rack moves to the friction transmission clutch 86 and the end of the power roller 81, and then the limiting effect of the power roller 81 rotating is realized. In the whole process, even if the locking magnet ring 89 is powered off, the position of the rack will not move, and then the friction transmission clutch 86 is always in contact with the power roller 81, and the power roller 81 will not rotate, realizing the locking effect of the power roller 81; then close the flip cover 9, after the locking magnet ring 89 is powered off and the winding magnet ring 85 is powered on, the other end of the flip cover 9 rotating shaft is connected with the corresponding bevel gear 84, and then under the transmission action of the two bevel gears 84, the winding rod 82 rotates, the power rope 80 is wound in 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 limiting plate 30 is released, and the limiting plate 30 can be controlled to move to the initial position, and the detection line can be removed.

[0091] Unless otherwise defined, technical terms or scientific terms used in the present application shall be understood as having the usual meaning understood by a person skilled in the art to which the present application belongs. The "first", "second", "third" and similar words used in the specification and claims of the present application do not represent any order, quantity or importance, but are used to distinguish different components. "One" or "a" and similar words do not represent a quantity limit, but represent the existence of at least one. "Include" or "contain" and similar words mean that the elements or objects appearing before "include" or "contain" cover the elements or objects listed after "include" or "contain" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0092] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A transformer DC resistance tester, characterized in that, include: Box body (1), operation panel (2) and wiring terminals provided on the operation panel (2); A limiting mechanism is used to prevent the detection line from being pulled out. The drive mechanism is used to control the limit mechanism to release the restriction on the detection line; The limiting mechanism includes: A limiting plate (30) is movably mounted on the operation panel (2); A transmission assembly is used to control the direction and position of movement of the limiting plate (30); Both the wiring port (31) and the detection port are located on the limiting plate (30). The end of the detection line passes through the wiring port (31) and connects to the wiring terminal. The detection port is used for the detection line to pass through. The transmission assembly is used to move the detection port on the limiting plate (30) to above the end of the detection line; The limiting mechanism further includes: The bracket (4) is slidably mounted on the operation panel (2); The limiting frame (5) is rotatably mounted on the bracket (4); A limiting component is used to provide a buffer distance during the rotation of the limiting frame (5); A movable component is used to enable the limiting plate (30) to slide vertically on the limiting frame (5) and be engaged at the lowest position; The limiting components include: 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) swings 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 limiting frame (5). The concave block (51) covers the limiting frame (5) at a distance close to its rotation axis. The bottom surface of the concave block (51) is used to support the bottom surface of the limiting frame (5). The bottom wall of the concave block (51) is provided with a mounting hole. The proximity switch (52) is disposed in the mounting hole and abuts against the bottom surface of the limiting frame (5) in the initial state. The moving component includes: An electromagnet (60) is used to attract the limiting plate (30) to the initial position; The elastic part (61) is used to enable the limiting plate (30) to be elastically disposed within the limiting frame (5); The snap-fit ​​part is used to snap the limiting plate (30) at the bottom. The proximity switch (52) controls the electromagnet (60) to attract or release the limiting plate (30), and the limiting plate (30) has an insulating layer on the part close to the detection line.

2. The transformer DC resistance tester according to claim 1, characterized in that, The snap-fit ​​portion includes: The plug-in block (62) and the button (63) are provided. The bottom side wall of the limiting frame (5) is provided with a plug-in hole (64). The plug-in hole (64) is through-hole. The button (63) slides and fits into the plug-in hole (64). The button (63) and the plug-in hole (64) are in clearance fit. When the plug-in block (62) is inserted into the plug-in hole (64), the button (63) is pushed out of the plug-in hole (64).

3. A transformer DC resistance tester according to claim 2, characterized in that, The transmission assembly includes: A locking part is used to lock the sliding operation of the bracket (4); The control unit is used to control the locking unit to trigger its operation; The locking part includes a first rack (70) and a second rack (71). The first rack (70) slides with the bracket (4), and the second rack (71) is elastically disposed on the operation panel (2). The first rack (70) and the second rack (71) are engaged and connected. The control unit includes: The locking block (72) includes a horizontal segment (722) and a vertical segment (721), and the vertical segment (721) is fixedly connected to the first rack (70); A vertical block is provided in a horizontal hole (73) for insertion into the horizontal section (722) of the locking block (72). When the horizontal segment (722) of the locking block (72) is inserted into the horizontal hole (73), the second rack (71) moves toward the first rack (70).

4. A transformer DC resistance tester according to claim 3, characterized in that, The drive mechanism includes: The flip cover (9) is rotated and is located on the screen of the operation panel (2) and is transparent; Adjust the component so that the bracket (4) can only be moved after the flip-up and cover-up actions of the flip cover (9) are completed in sequence.

5. A transformer DC resistance tester according to claim 4, characterized in that, The adjustment component includes: A power rope (80) is used to pull the second rack (71) until it is separated from the first rack (70); A power roller (81) is used to wind the other end of the power rope (80); A locking part is used to lock the power roller (81); The winding section is used to wind the power rope (80) so that the second rack (71) is separated from the first rack (70).

6. A transformer DC resistance tester according to claim 5, characterized in that, The winding portion includes: The 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) mesh with each other, and one of them is fixed coaxially with one end of the winding rod (82), and the other is fixed coaxially with the rotation axis of the flip cover (9); A magnetic ring (85) is wound around the flip cover (9) to attract or separate the rotating shaft from the corresponding bevel gear (84).

7. A transformer DC resistance tester according to claim 6, characterized in that, The locking part includes: A friction drive clutch (86) is used to engage with the end of the power roller (81) to achieve locking; The first gear (87) and the third rack (88) are rotatably mounted on the operation panel (2) and mesh with the third rack (88). The third rack (88) is fixedly connected to the friction drive clutch (86). A 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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