A positioning device for partial discharge testing

Abstract

The invention discloses a positioning device for partial discharge test, belonging to the field of partial discharge test; a positioning device for partial discharge test comprises a workbench, a support frame, a lifting plate assembly, a clamping mechanism, a snap mechanism and a connecting mechanism; a slidable support frame is arranged at the upper end of the workbench, a lifting plate assembly is arranged on the support frame, and a sensor of an ultrasonic partial discharge tester is fixed on the lifting plate, so that the sensor can be driven to be attached to the shell of the device to be tested, compared with the prior art in which the tester sensor is manually held to contact the shell of the device to be tested, the stability of the discharge test is ensured and the burden on the operator is reduced; a clamping mechanism is arranged at the upper end of the workbench to achieve positioning and fixing of the device to be tested; and a snap mechanism and a connecting mechanism are arranged to control the test timing of the partial discharge test and ensure the reliability of the test result.

Description

Technical Field

[0001] The invention belongs to the field of partial discharge testing, and in particular relates to a positioning device for partial discharge testing. Background Art

[0002] With the continuous development of science and technology, partial discharge test is widely used in power safety test of power department. Partial discharge test is mostly measured by partial discharge tester. Partial discharge tester adopts advanced anti-interference components and unique gate display circuit, and has four high-frequency elliptical scanning. It is suitable for type and factory test of high-voltage products, new product development test, quantitative test of partial discharge of motors, mutual inductors, cables, bushings, capacitors, transformers, lightning arresters, switches and other high-voltage electrical appliances, and can be used on-site by manufacturers, scientific research departments and power departments.

[0003] As a type of discharge tester, the ultrasonic partial discharge tester must have its sensor tightly fitted with the shell of the device under test during the measurement process. If the shell of the device under test is an ordinary steel plate, the sensor can be fixed with the magnetic fixing base provided by the instrument. If the shell of the device under test is a low-magnetic steel plate, an aluminum alloy shell or a porcelain bushing, the sensor can only be fixed by hand. At this time, the vibration of the hand will seriously interfere with the test data, and holding the device for a long time will also bring a burden to the operator. Summary of the invention

[0004] In view of the deficiencies of the prior art, an object of the present invention is to provide a positioning device for partial discharge testing, which solves the problem in the prior art that the sensor is fixed by hand, which affects the test data and increases the burden on the operator.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A positioning device for partial discharge testing, comprising a workbench, a device to be tested is arranged on the workbench, a support frame is slidably connected to the upper end of the workbench, two first fixing plates are arranged at the upper end of the workbench, a first screw rod is rotatably connected between the two first fixing plates, and a first driving device for driving the first screw rod to rotate is fixed to one of the first fixing plates;

[0007] The support frame is provided with a lifting plate assembly, the lifting plate assembly includes a lifting plate slidably connected to the support frame, and the sliding direction is a vertical direction, the support frame is rotatably connected to a second screw rod, and the upper end of the support frame is provided with a second driving device for driving the second screw rod to rotate;

[0008] The lifting plate is fixed with a sensor, and the sensor is attached to the housing of the device to be tested to realize partial discharge testing.

[0009] Furthermore, a fixing frame is provided on the lifting plate, a first adjusting rod is threadedly connected to the fixing frame, a pressure plate is rotatably connected to the end of the first adjusting rod, the pressure plate is slidably connected to the fixing frame, and by twisting the first adjusting rod, the pressure plate can be brought close to the lifting plate, thereby fixing the sensor.

[0010] Furthermore, the workbench is provided with a clamping mechanism, which is used to position and fix the device to be tested;

[0011] The clamping mechanism includes two clamping plates slidably connected to the workbench, a first rack is respectively fixed to the lower end of the two clamping plates, a third driving device is fixed to the upper end of the workbench, a first gear is fixed on the driving shaft of the third driving device, the first gear is located between the two first racks and meshes with the two first racks at the same time, and by controlling the operation of the third driving device, the two clamping plates can slide synchronously in opposite directions, thereby realizing the centering clamping and fixation of the equipment to be tested.

[0012] Furthermore, a locking mechanism is provided at the upper end of the workbench, and the locking mechanism includes a second fixed plate fixed on the upper end of the workbench, a sliding rod is slidably connected to the second fixed plate, and a locking plate is provided at one end of the sliding rod; a spring is sleeved on the sliding rod, and the two ends of the spring are respectively fixedly connected to the side surface of the second fixed plate and the side surface of the locking plate, and under the elastic force of the spring, the locking plate can be locked with the spiral groove of the first screw rod.

[0013] Furthermore, a connecting mechanism is provided on the workbench, and the connecting mechanism includes a rotating rod rotatably connected to the workbench, a second gear is fixed above the rotating rod, a second rack is provided on the sliding rod, and the second rack and the second gear are meshed with each other; a connecting rod is fixed on one side of one of the clamps, a fixed rod is provided at the end of the connecting rod, and a third rack is provided on the fixed rod, and in the process of the two clamps approaching each other, the third rack can mesh with the second gear and drive the sliding rod to slide in a direction away from the first screw rod; and, when the two clamps clamp the device to be tested, the clamping plate just leaves the first screw rod.

[0014] Furthermore, the connecting rod is slidably connected to the fixed rod, and a third fixing plate is provided on the fixed rod, a second adjusting rod is threadedly connected to the third fixing plate, and the end of the second adjusting rod is rotatably connected to the connecting rod, and the relative position between the connecting rod and the fixed rod can be changed by twisting the second adjusting rod.

[0015] The beneficial effects of the present invention are as follows: a slidable support frame is arranged at the upper end of the workbench, a lifting plate assembly that can be raised and lowered is arranged on the support frame, and the sensor of the ultrasonic partial discharge tester is fixed on the lifting plate, so that the sensor can be driven to stick to the shell of the device to be tested. Compared with the prior art in which the tester sensor is manually held in hand to contact the shell of the device to be tested, the stability of the discharge test is ensured and the burden on the operator is reduced; a clamping mechanism is arranged at the upper end of the workbench to achieve positioning and fixation of the device to be tested; and a snap-fit ​​mechanism and a connecting mechanism are arranged to control the test timing of the partial discharge test and ensure the reliability of the test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the workbench structure of an embodiment of the present invention;

[0019] Figure 3 is a schematic structural diagram of a lifting plate assembly according to an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of the fixing mechanism structure of an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of the structure of the engaging mechanism of an embodiment of the present invention;

[0022] Figure 6 It is a schematic diagram of the connecting mechanism structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] like Figure 1 As shown, a positioning device for partial discharge testing includes a workbench 1, a device to be tested is arranged on the upper end of the workbench 1, and a partial discharge test is performed on the device to be tested by an ultrasonic partial discharge tester;

[0025] The upper end of the workbench 1 is slidably connected to a support frame 2, and a lifting plate assembly 4 that can be raised and lowered is provided on the support frame 2. The sensor of the ultrasonic partial discharge tester is fixed on the lifting plate assembly 4. By controlling the sliding of the support frame 2, the sensor can contact the shell of the device to be tested, so as to perform partial discharge tests on multiple points of the device to be tested. Compared with the prior art in which the sensor of the tester is manually held in hand to contact the shell of the device to be tested, the stability of the discharge test is ensured and the burden on the operator is reduced.

[0026] like Figure 2 As shown, two first fixing plates 11 are provided at the upper end of the workbench 1, and a first screw rod 3 is rotatably connected between the two first fixing plates 11. The first screw rod 3 passes through the support frame 2 and is threadedly connected to the support frame 2. A first driving device 31 for driving the first screw rod 3 to rotate is fixed on one of the first fixing plates 11, so that the support frame 2 can slide in a direction close to the device to be tested;

[0027] The support frame 2 is rotatably connected to a second screw rod 6. Figure 3 As shown, the lifting plate assembly 4 includes a lifting plate 41 that is slidably connected to the support frame 2, and the sliding direction is the vertical direction. The second screw rod 6 penetrates the lifting plate 41 along the vertical direction and is threadedly connected to the lifting plate 41. The upper end of the support frame 2 is provided with a second driving device 61 for driving the second screw rod 6 to rotate, thereby realizing the control of the lifting and lowering movement of the lifting plate 41; the sensor is fixed on the lifting plate 41 and rises and falls accordingly, so that multi-point testing can be completed from the height direction of the equipment to be tested.

[0028] In this embodiment, if Figure 3 As shown, a fixing frame 411 is arranged at the upper end of the lifting plate 41, and a first adjusting rod 42 is threadedly connected to the fixing frame 411. A pressing plate 43 is rotatably connected to the end of the first adjusting rod 42. The pressing plate 43 is slidably connected to the fixing frame 411. By twisting the first adjusting rod 42, the pressing plate 43 can be brought close to the lifting plate 41, thereby fixing the sensor; and it is convenient for disassembly and installation of the sensor at a later time.

[0029] The workbench 1 is provided with a fixing mechanism 5, which is used to position and fix the device under test to prevent the device under test from moving during the test, thereby affecting the test results;

[0030] like Figure 4As shown, the fixing mechanism 5 includes two clamping plates 51 slidably connected to the workbench 1, and a first rack 52 is fixed to the lower end of the two clamping plates 51 respectively, and a third driving device 53 is fixed to the upper end of the workbench 1. A first gear 54 is fixed on the driving shaft of the third driving device 53, and the first gear 54 is located between the two first racks 52 and meshes with the two first racks 52 at the same time. By controlling the operation of the third driving device 53, the two clamping plates 51 can slide synchronously in opposite directions, thereby realizing the centering clamping and fixing of the device to be tested to prevent the device to be tested from moving during the test; at the same time, the device to be tested is clamped in the center to prevent the device to be tested from being clamped off-center, so that the sensor cannot act on the device to be tested, thereby realizing the positioning function.

[0031] A clamping mechanism 7 is provided at the upper end of the workbench 1, and the clamping mechanism 7 is used to limit the rotation of the first screw rod 3, thereby limiting the sliding of the support frame 2, so as to prevent the sensor from approaching the device to be tested, thereby achieving the purpose of preventing the test;

[0032] like Figure 5 As shown, the locking mechanism 7 includes a second fixed plate 71 fixed to the upper end of the workbench 1, and a sliding rod 72 is slidably connected to the second fixed plate 71. A locking plate 73 is provided at one end of the sliding rod 72, and the locking plate 73 can be engaged with the spiral groove of the first screw rod 3, thereby limiting the rotation of the first screw rod 3; a spring 74 is sleeved on the sliding rod 72, and the two ends of the spring 74 are fixedly connected to the side of the second fixed plate 71 and the side of the locking plate 73 respectively. Under the elastic force of the spring 74, the locking plate 73 can be engaged with the spiral groove of the first screw rod 3.

[0033] The workbench 1 is provided with a connecting mechanism 8, which is used to control the clamping timing of the clamping mechanism 7, and further to control the test timing, so that the partial discharge test can be performed only after the device under test is clamped and fixed, to prevent the device under test from moving during the test and affecting the test results;

[0034] like Figure 6 As shown, the connecting mechanism 8 includes a rotating rod 81 rotatably connected to the workbench 1, a second gear 82 is fixed on the top of the rotating rod 81, a second rack 721 is provided on the sliding rod 72, and the second rack 721 is meshed with the second gear 82; a connecting rod 83 is fixed on one side of one of the clamping plates 51, a fixing rod 84 is provided at the end of the connecting rod 83, and a third rack 86 is provided on the fixing rod 84, when the two clamping plates 51 approach each other, the third rack 86 can mesh with the second gear 82, and drive the sliding rod 82 to slide in the direction away from the first screw rod 3; and when the two clamping plates 51 clamp the device to be tested, the clamping plate 73 just leaves the first screw rod 3, thereby achieving: only after the device to be tested is clamped and fixed, can the partial discharge test be carried out to ensure the reliability of the test result;

[0035] In this embodiment, the connecting rod 83 is slidably connected to the fixed rod 84, and a third fixed plate 841 is provided on the fixed rod 84, and a second adjusting rod 85 is threadedly connected to the third fixed plate 841, and the end of the second adjusting rod 85 is rotatably connected to the connecting rod 83. By twisting the second adjusting rod 85, the relative position between the connecting rod 83 and the fixed rod 84 can be changed, so that when the clamping plate 73 just leaves the first screw rod 3, the distance between the two clamping plates 51 is changed, thereby realizing precise control of the test timing of the equipment to be tested of different specifications to ensure the reliability of the test results.

[0036] Working principle:

[0037] A slidable support frame 2 is provided at the upper end of the workbench 1, and a lifting plate assembly 4 that can be raised and lowered is provided on the support frame 2. The sensor of the ultrasonic partial discharge tester is fixed on the lifting plate 41, so that the sensor can be driven to stick to the housing of the device to be tested. Compared with the manual hand-held tester sensor to contact the housing of the device to be tested in the prior art, the stability of the discharge test is guaranteed and the burden on the operator is reduced; a clamping mechanism 5 is provided at the upper end of the workbench 1 to achieve positioning and fixation of the device to be tested; and a snap-fit ​​mechanism 7 and a connecting mechanism 8 are provided to control the test timing of the partial discharge test, so that the partial discharge test can be performed only after the device to be tested is clamped and fixed, thereby ensuring the reliability of the test result.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0039] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A positioning device for partial discharge testing, comprising a workbench (1), on which a device to be tested is arranged, characterized in that: The upper end of the workbench (1) is slidably connected to a support frame (2); two first fixed plates (11) are provided at the upper end of the workbench (1); a first screw rod (3) is rotatably connected between the two first fixed plates (11); a first driving device (31) for driving the first screw rod (3) to rotate is fixed on one of the first fixed plates (11); The support frame (2) is provided with a lifting plate assembly (4), the lifting plate assembly (4) comprises a lifting plate (41) slidably connected to the support frame (2), and the sliding direction is a vertical direction. The support frame (2) is rotatably connected to a second screw rod (6), and the upper end of the support frame (2) is provided with a second driving device (61) for driving the second screw rod (6) to rotate; A sensor is fixed on the lifting plate (41), and the sensor is attached to the housing of the device to be tested to implement partial discharge testing; The workbench (1) is provided with a clamping mechanism (5), and the clamping mechanism (5) is used to position and fix the device to be tested; The clamping mechanism (5) comprises two clamping plates (51) slidably connected to the workbench (1); a first rack (52) is fixed to the lower end of each of the two clamping plates (51); a third driving device (53) is fixed to the upper end of the workbench (1); a first gear (54) is fixed to the driving shaft of the third driving device (53); the first gear (54) is located between the two first racks (52) and meshes with the two first racks (52) at the same time; by controlling the operation of the third driving device (53), the two clamping plates (51) can be synchronously slid in opposite directions, thereby achieving centering, clamping and fixing of the device to be tested; The upper end of the workbench (1) is provided with a locking mechanism (7), which comprises a second fixing plate (71) fixed to the upper end of the workbench (1), a sliding rod (72) being slidably connected to the second fixing plate (71), and a locking plate (73) being provided at one end of the sliding rod (72); a spring (74) is sleeved on the sliding rod (72), and the two ends of the spring (74) are respectively fixedly connected to the side surface of the second fixing plate (71) and the side surface of the locking plate (73); under the elastic force of the spring (74), the locking plate (73) can be locked with the spiral groove of the first screw rod (3); The workbench (1) is provided with a connecting mechanism (8), which includes a rotating rod (81) rotatably connected to the workbench (1), a second gear (82) being fixed above the rotating rod (81), a second rack (721) being provided on the sliding rod (72), and the second rack (721) and the second gear (82) being meshed with each other; a connecting rod (83) is fixed on one side of one of the clamping plates (51), a fixing rod (84) being provided at the end of the connecting rod (83), and a third rack (86) being provided on the fixing rod (84), and when the two clamping plates (51) approach each other, the third rack (86) can mesh with the second gear (82) and drive the sliding rod (82) to slide in a direction away from the first screw rod (3); and when the two clamping plates (51) clamp the device to be tested, the clamping plate (73) just leaves the first screw rod (3).

2. A positioning device for partial discharge testing according to claim 1, characterized in that: The lifting plate (41) is provided with a fixing frame (411), a first adjusting rod (42) is threadedly connected to the fixing frame (411), a pressing plate (43) is rotatably connected to the end of the first adjusting rod (42), and the pressing plate (43) is slidably connected to the fixing frame (411), and by twisting the first adjusting rod (42), the pressing plate (43) can be brought close to the lifting plate (41), thereby achieving fixation of the sensor.

3. A positioning device for partial discharge testing according to claim 1, characterized in that: The connecting rod (83) is slidably connected to the fixing rod (84), and a third fixing plate (841) is provided on the fixing rod (84). A second adjusting rod (85) is threadedly connected to the third fixing plate (841). The end of the second adjusting rod (85) is rotatably connected to the connecting rod (83). By twisting the second adjusting rod (85), the relative position between the connecting rod (83) and the fixing rod (84) can be changed.

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