CN218865938U - High-voltage gear switching device for cable test - Google Patents

Abstract

The utility model relates to a voltage gear auto-change over device for cable test. The existing cable testing and grading device is used in a low-voltage state. The utility model discloses a high-pressure gear auto-change over device for cable test, including fixed frame, be provided with the chassis on fixed frame's the bottom plate, chassis lower extreme circumference equidistance array is provided with a plurality of gear contact, and the pot head is equipped with the intervalve on the chassis, and the inside cover of intervalve is equipped with the screw rod, and the lower extreme and the chassis threaded connection of screw rod are fixed, and the screw rod periphery cover of intervalve is equipped with the spring, is provided with the through-hole that runs through the intervalve on the eccentric axis of intervalve, and the axle center of through-hole is located on the virtual center circle of gear contact array, the screw rod endotheca is equipped with J type center contact, the upper end of intervalve is fixed with the connection pad, and the upper end of connection pad is provided with the connecting rod, and the contact is connected respectively on the center contact and the gear contact of different array positions. The utility model discloses can be used to the gear switching of cable 1KV-30KV high pressure test.

Description

High-voltage gear switching device for cable test

Technical Field

The utility model relates to a cable high-voltage insulation test device specifically indicates a voltage gear auto-change over device for cable test, and the device can satisfy 1KV to 30 KV's cable high-voltage insulation test or cable fault test.

Background

At present, corresponding test voltage is often applied according to the voltage grade of a cable in a cable voltage withstand test or a cable fault test, and a voltage gear switching device is a simple, convenient and effective technical method. At present, in the cable test under 1KV, the switching of different test voltages can be realized by adopting electric elements such as a waveband switch, an electromagnetic relay and the like. However, under the condition of higher voltage level, no proper electrical element can realize the switching function of a plurality of (3 and more) voltage gears when testing high voltage of more than 10 KV.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model aims at providing a high-pressure gear auto-change over device for cable test, it makes the contact remove and the contact does not go on in the coplanar through carrying to draw rotatory mode when the gear switches, reduces the frictional contact time of contact when the gear switches over, and contact arc is little, and withstand voltage degree is high, can satisfy the cable test use of 1KV to 30 KV.

In order to realize the purpose, the utility model discloses a technical scheme as follows:

a high-voltage gear switching device for cable testing comprises a fixed frame, wherein a base plate is arranged on a bottom plate of the fixed frame, a plurality of gear contacts are arranged on the circumference of the lower end of the base plate in an equidistant array manner, the lower end of each gear contact penetrates out of the base plate and then extends out of the bottom of the fixed frame, and the upper end of each gear contact is exposed out of the base plate; the upper end of the base plate is sleeved with a middle plate, a screw rod is sleeved in the middle plate, the lower end of the screw rod is fixedly connected with the base plate in a threaded manner, a spring is sleeved on the periphery of the screw rod in the middle plate, a through hole penetrating through the middle plate is formed in an eccentric axis of the middle plate, the axis of the through hole is located on a virtual center circle of the gear contact array, a J-shaped center contact is sleeved in the screw rod, the upper end of the center contact penetrates through the screw rod and then extends into the through hole, the lower end of the center contact extends out of the bottom of the fixed frame, a connecting disc is fixed at the upper end of the middle plate and limits the screw rod in the middle plate, a connecting rod is arranged at the upper end of the connecting disc, and the upper end of the connecting rod extends out of the fixed frame; and the connecting rod is rotated by lifting, and the middle disc drives the central contact to rotate, so that the upper end of the central contact is in contact connection with the upper ends of the exposed gear contacts at different array positions on the chassis.

Furthermore, optical intermittent sensors are arranged on the outer peripheral surface of the top plate of the fixed frame at intervals, blocking pieces corresponding to the optical intermittent sensors are arranged on the outer peripheral surface of the upper end of the connecting disc at intervals, and when the central contact contacts the gear contacts at different positions respectively, the blocking pieces at different positions extend into the corresponding optical intermittent sensors to trigger the optical intermittent sensors to indicate that the gear contacts at different positions are communicated with the central contact.

Furthermore, two limiting rods are arranged on the bottom plate of the fixed frame in a circumferential array mode and located on the periphery of the chassis, a stop rod extending outwards is arranged on the outer peripheral surface of the middle disc, and the middle disc is limited in an obtuse angle range formed by connecting lines of two adjacent gear contacts and the center of the virtual center circle by the stop rod when the middle disc rotates around the chassis.

Furthermore, when the stop lever is contacted with one limiting rod to be limited, one gear contact is communicated with the central contact.

Furthermore, the gear contact is formed by connecting a gear line rod and a gear short contact, and the lower end of the gear short contact is in threaded connection with the upper end of the gear line rod; the central contact is formed by connecting a central line rod and a central long contact, the upper end of the central long contact is in threaded connection with the bent end part of the upper end of the central line rod, and the central contact rotates to drive the lower end of the central long contact to be in contact connection with the upper ends of the gear short contacts at different array positions respectively.

Furthermore, a polytetrafluoroethylene gasket is arranged between the chassis and the intermediate disc, stepped holes coaxial with each gear contact are formed in the polytetrafluoroethylene gasket in a circumferential array mode, and the contact surface of the central contact and the gear contact is located in the stepped holes.

Furthermore, the fixed frame is of a frame structure, and the peripheries of a bottom plate and a top plate of the fixed frame are connected into a whole up and down through support columns; the lower end of the connecting rod is fixedly connected with the connecting disc, and the upper end of the connecting rod is provided with a rotary handle.

Further, the periphery of gear contact and center contact all wraps up there is the insulating layer.

Further, the number of the gear contacts is 3, the optical discontinuity sensors are respectively arranged on the outer peripheral surface of the top plate of the fixed frame at intervals of 120 degrees, and the barrier pieces are respectively arranged on the outer peripheral surface of the upper end of the connecting disc at intervals of 120 degrees.

Further, the two limiting rods are mutually spaced by 90 degrees, and the stop lever is limited in an included angle of 240 degrees by the limiting rods.

The utility model discloses owing to take above-mentioned technical scheme, it has following advantage and effect:

1. the utility model discloses gear auto-change over device tests the mutual switching between the gear through rotatory mode, and the gear switches rapidly, can avoid switching between the contact long-time contact spark problem that the friction brought, simultaneously, adopts insulating material to wrap up into the insulating layer through gear contact and center contact, has fine high pressure resistant characteristic, can realize the reliable test of 1KV to 30KV voltage level.

2. The utility model discloses the supplementary gear detection device who constitutes through setting up the discontinuous sensor of light and separation piece on the gear auto-change over device can realize switching the real-time suggestion and the warning function of three kinds of gears in-process, and the operator of being convenient for tests and uses, and it is simple and convenient reliable to use.

3. The utility model discloses a gear auto-change over device, this kind of rotatory pull-up formula structure can derive the auto-change over device that different quantity switched the gear through the mode of increase and decrease gear contact, can require the switching gear that the preparation matches according to the cable test of difference, can adapt to the multiple test requirement of different cables.

Drawings

Fig. 1 is a schematic perspective view of the present invention.

Fig. 2 is a schematic view of the bottom view of the present invention.

Fig. 3 is an external structural schematic diagram when the 0-mark position center contact and the 1-mark position shift position contact are connected.

Fig. 4 isbase:Sub>A sectional viewbase:Sub>A-base:Sub>A of fig. 3.

Fig. 5 is an external structural schematic diagram when the 0-mark position center contact and the 2-mark position shift contact are connected.

Fig. 6 is a sectional view B-B of fig. 5.

Fig. 7 is an external structural schematic diagram when the 0-mark position center contact and the 3-mark position shift position contact are connected.

Fig. 8 is a cross-sectional view taken along line C-C of fig. 7.

In the figure, 1-rotating handle, 2-connecting rod, 3-fixed frame, 4-optical discontinuous sensor, 5-blocking piece, 6-connecting disk, 7-middle disk, 8-chassis, 9-gear contact, 10-central contact, 11-limiting rod, 12-blocking rod, 13-spring, 14-screw, 15-polytetrafluoroethylene gasket, 031-top plate, 032-supporting column, 033-bottom plate, 091-gear short contact, 092-gear line rod, 093-first nut, 0101-central line rod, 0102-central long contact and 0103-second nut.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

As shown in fig. 1-8. The utility model provides a high-pressure gear switching device for cable test, including fixed frame 3, be provided with chassis 8 on fixed frame 3's bottom plate 033, chassis 8 lower extreme circumference equidistance array is provided with a plurality of gear contact 9, and each gear contact 9 lower extreme wears out stretch out behind the chassis 8 fixed frame 3's bottom, the upper end of each gear contact 9 exposes chassis 8, chassis 8 upper end cover be equipped with intermediate disc 7, intermediate disc 7 is inside to be equipped with screw rod 14, the lower extreme of screw rod 14 is fixed with chassis 8 threaded connection, screw rod 14 periphery cover of intermediate disc 7 is equipped with spring 13, be provided with the through-hole that runs through intermediate disc 7 on the eccentric axis of intermediate disc 7, the axle center of through-hole is located the virtual center circle of gear contact 9 array, screw rod 14 endotheca be equipped with J type center contact 10, the upper end of center contact 10 pass screw rod 14 after stretch into the through-hole, the lower extreme of center contact 10 stretch out the bottom of fixed frame 3 flush with the end of gear contact 9, the upper end of intermediate disc 7 is fixed with connection pad 6, screw rod 14 be in the upper end of intermediate disc 7 of connection pad 6 is provided with the connecting rod 2 of connecting rod 2, the fixed frame 3 is provided with the upper end of spacing terminal of connecting pad 2; and when the connecting rod 2 is rotated, the middle disc 7 drives the central contact 10 to rotate, so that the upper end of the central contact 10 is in contact connection with the upper ends of the exposed gear contacts 9 at different array positions on the chassis 8 respectively.

Specifically, in this embodiment, preferably, the number of the shift position contacts 9 is 3, and three shift position contacts 9 are arranged at an interval of 120 °. The base plate 8 be circular column dish, 8 upper ends on the base plate are circular recess, circular recess and base plate excircle are concentric, owe in the circular recess and establish intermediate disk 7 bottom, 8's circular recess center on the base plate is provided with the screw hole that link up, the screw hole is used for fixed screw 14, 14 lower extremes of screw rod set up the screw hole cooperation of external screw thread and base plate, the upper end of screw rod 14 has the flange of outside extension. The circumference equidistance array is provided with three first shoulder holes that link up on chassis 8's the circular groove face, and first shoulder hole is big end down, and three first shoulder hole is used for wearing to establish three gear contact 9 respectively, and chassis 8 lower extreme has a plurality of first screw holes at the periphery circumference equidistance array of shoulder hole, and fixed frame 3 bottom plate 033 lower extreme sets up the cooperation of a plurality of screws and chassis 8's first screw hole and closes chassis 8 on bottom plate 033.

The middle disk 7 is a circular column disk, the height of the middle disk is approximately equal to that of the base disk 8, the lower end part of the middle disk 7 is sleeved in a circular groove of the bottom plate 033, and the middle disk 7 is movably connected with the base disk 8 and can rotate coaxially with the circular groove of the base disk 8. The central position of the middle disc 7 is provided with a second stepped hole in a serial communication mode, the second stepped hole is of a big-end-up structure and a small-end-up structure, the second stepped hole is used for penetrating the screw rod 14 and the spring 13, and the spring 13 is sleeved between the screw rod 14 and the second stepped hole, supported and limited between a stepped surface of the second stepped hole and a flange at the upper end of the screw rod 14. The through hole of the eccentric position of the middle disc 7 is a third stepped hole which runs through the middle disc, the upper size structure of the third stepped hole is used for penetrating the upper end of the central contact 10, the aperture size of the third stepped hole is the same as that of the first stepped hole, and the virtual circle radius of the third stepped hole is the same as that of the first stepped hole circular array on the chassis 8. The upper end surface of the middle disk 7 is also provided with a plurality of second threaded holes in a circumferential equidistant array.

The connecting disc 6 is a circular column disc, the height of the connecting disc 6 is about half of the height of the middle disc 7, and the outer diameter of the connecting disc 6 is the same as that of the middle disc 7. The center of the upper end of the connecting disc 6 is provided with a groove for fixing the bottom of the connecting rod 2, a plurality of third threaded holes are formed in the inner circumference of the groove in an equidistant array mode, a plurality of second threaded holes are formed in the upper end face of the periphery of the groove of the connecting disc 6 in an equidistant array mode, and a plurality of screws penetrate through the second threaded holes and are connected with second threaded holes in the intermediate disc 7 in a matched mode to fix the connecting disc 6 at the upper end of the intermediate disc 7. The lower end surface of the connecting disc 6 is provided with a groove for accommodating the top of the central contact 10, and after the connecting disc 6 and the intermediate disc 7 are fixed, the central contact 10 and the screw 14 are arranged between the connecting disc 6 and the intermediate disc 7.

The straight rod part of the central contact 10 is arranged in the screw hole and extends out of the bottom of the fixed frame 3, the end part of the bending part of the central contact 10 is positioned on the upper part of the middle disc 7, the transition section of the bending part adopting arc transition is embedded in the bottom groove of the connecting disc 6, and the lower end of the bending part extends into the third stepped hole of the middle disc 7.

Connecting rod 2 have epitaxial T type pole for the bottom, 2 bottom epitaxy go up circumference equidistance array and set up a plurality of third screw holes, epitaxy is owed to establish in the top recess of connection pad 6, a plurality of screws pass the third screw hole cooperation in screw hole and the 6 recesses of connection pad and fix connecting rod 2 in 6 upper ends of connection pad. The upper end of the connecting rod extends out of the top plate 031 of the fixed frame 3.

Further, fixed frame 3 be frame rack type structure, fixed frame 3's bottom plate 033 and roof 031 periphery connect as an organic whole from top to bottom through support column 032.

Specific speaking, fixed frame 3's bottom plate 033 and roof 031 are the square board, fixed frame 3 is by bottom plate 033, roof 031 and four support columns 032 connect up and down fixed as an organic whole, bottom plate 033 center is provided with the central pole hole that supplies middle central contact 10 to pass, the equidistant array of circumference has the gear pole hole that supplies three gear contact to pass on the bottom plate 033 in pole hole periphery, interval array is provided with a plurality of first screw holes on the periphery bottom plate 033 in three gear pole hole, a plurality of screws pass first screw hole and the cooperation of the first screw hole of chassis 8 bottom with chassis 8 bottom be connected chassis 8 and fixed frame 3's bottom plate 033 fixedly. The gear lever holes on the bottom plate 033 are arranged at intervals of 120 degrees, three gear mark symbols of 1, 2 and 3 are correspondingly arranged on the bottom plate 033 at the outer side of each gear lever hole respectively, the three mark symbols correspond to mark positions of 3 gear contacts 9 respectively, a mark symbol of 0 is correspondingly arranged on the bottom plate 033 near the middle center lever hole, and the mark position of 0 corresponds to a mark position of a center contact 10.

Further, optical discontinuity sensors 4 are arranged on the outer peripheral surface of a top plate 031 of the fixed frame 3 at intervals, barrier pieces 5 corresponding to the optical discontinuity sensors 4 are arranged on the outer peripheral surface of the upper end of the connecting disc 6 at intervals, and when the central contact 10 is in contact with the gear contacts 9 at different positions respectively, the barrier pieces 5 at different positions extend into the corresponding optical discontinuity sensors 4 to trigger the optical discontinuity sensors 4 to indicate that the gear contacts 9 at different positions are connected with the central contact 10.

Specifically, in order to detect three switching positions, the photo interrupter sensors 4 are disposed on the outer circumferential surface of the top plate 031 of the fixing frame 3 at intervals of 120 °, and the barrier ribs 5 are disposed on the outer circumferential surface of the upper end of the connecting plate 6 at intervals of 120 °. When the optical discontinuity sensor 4 and the barrier sheet 5 are arranged, mutually sunken chutes are respectively arranged on two sides of the front end of a top plate 031 of the fixed frame 3, inclined planes of the two chutes are oppositely arranged and form a 120-degree included angle, the optical discontinuity sensor 4 is respectively and fixedly arranged on the inclined planes of the two chutes, wherein an A indicating mark symbol is arranged on the top plate 031 of the optical discontinuity sensor 4 on one side corresponding to the 3 mark symbols from top to bottom, a B indicating mark symbol is arranged near the top plate 031 of the optical discontinuity sensor 4 on the other side, and the B indicating mark symbol corresponds to the 1-gear mark symbol on the bottom plate 033 from top to bottom.

Furthermore, two limiting rods 11 are arranged on the bottom plate 033 of the fixed frame 3 in a circumferential array manner, the limiting rods 11 are located on the periphery of the chassis 8, stop rods 12 extending outwards are arranged on the peripheral surface of the intermediate disc 7, and the intermediate disc 7 is limited in an obtuse angle range formed by connecting lines of the two adjacent gear contacts 9 and the circle center of the virtual center circle by the stop rods 12 when rotating around the chassis.

Specifically, in order to ensure that the shift range is shifted between the first shift range and the last shift range, two limit rods 11 are respectively disposed on the bottom plate 033, and when the intermediate plate 7 rotates to shift the shift range, the stop rod 12 limits the rotation angle of the intermediate plate 7 between the first shift range and the last shift range. In this embodiment, the number of the gear contacts 9 is three, so that the two limiting rods 11 are arranged at an interval of 90 degrees, that is, the two limiting rods 11 form an included angle of 90 degrees with a connection line of the virtual circle centers of the array, and the stop rod 12 is limited by the limiting rods 11 within an included angle of 240 degrees. When the two limiting rods 11 are fixedly installed, fourth threaded holes are respectively formed in the bottom plate 033 vertically corresponding to the front side and the right side of the 3-mark symbol, the lower ends of the two limiting rods 11 are matched and connected with the two fourth threaded holes, the limiting rods 11 are fixed between the bottom plate 033 and the top plate 031, the height of the limiting rods 11 is higher than the position of the stop lever 12, and the stop lever 12 is arranged on the outer peripheral surface of the middle plate 7 corresponding to the lower end of the central contact 10 and is perpendicular to the axis of the middle plate. When the stop lever rotates from the position of the stop lever 11 blocked at one side to the position of the stop lever 11 blocked at the other side and the stop lever 11 blocked at the other side by the stop lever 11, the stop lever 12 rotates by an angle of 240 degrees. When the gear lever is blocked at the position of the limiting rod 11 on one side, the upper end of the central contact 10 is coaxial with the first gear contact 9, when the gear lever rotates by a half angle, the upper end of the central contact 10 is coaxial with the second gear contact 9, and when the gear lever rotates to be blocked at the position of the limiting rod 11 on the other side, the upper end of the central contact 10 is coaxial with the third gear contact 9.

Further, when the stop lever 12 contacts one of the limiting levers 11 to be limited, one of the shift position contacts 9 is communicated with the center contact 10. After each time the gear lever 12 rotates, due to the action of the spring 13, the lower end of the center contact 10 moves downwards under the action of the spring 13 to be in contact with the corresponding gear position contacts 9 at different positions, so that the lower end of the center contact is in contact communication with the upper ends of the gear position contacts.

Further, the gear position contact 9 is formed by connecting a gear position line rod 092 and a gear position short contact 091, and the lower end of the gear position short contact 091 is in threaded connection with the upper end of the gear position line rod 092; the central contact 10 is formed by connecting a central line rod 0101 and a central long contact 0102, the upper end of the central long contact 0102 is in threaded connection with the bent end part of the upper end of the central line rod 0101, and the central contact 10 rotates to drive the lower end of the central long contact 0102 to be in contact connection with the upper ends of the gear short contacts 091 in different array positions respectively.

Because gear contact 9 and central contact 10 contact process can produce great friction, in order to prevent that the friction improves withstand voltage performance, respectively at central line pole 0101 upper end threaded connection central long contact 0102 constitution central contact 10, at each gear line pole 092 upper end threaded connection gear short contact 091 constitution gear contact 9. That is, the lower end of the bending part at the upper end of the centerline rod 0101 is provided with a threaded column, the upper end of the center long contact 0102 is provided with a threaded hole, the threaded column of the centerline rod 0101 and the threaded hole of the center long contact 0102 are in threaded connection, the threaded column is arranged at the upper end of the gear contact, the lower end of the gear short contact 091 is provided with a threaded hole, and the threaded column of the gear contact 9 and the threaded hole of the gear short contact 091 are in threaded connection. The gear short contact 091 and the center long contact 0102 are both made of red copper materials, and meanwhile, flange platforms are arranged at the contact ends of the gear short contact 091 and the center long contact 0102 to increase the contact area of the gear short contact 091 and the center long contact 0102, so that reliable contact is achieved, and high-voltage testing of cables is met.

As a preference, the connection mode of the gear position contact 9 and the center contact 10 can also be selected as follows:

the lower tip that the upper end of centerline pole 0101 was bent department sets up the screw hole, and the upper end of the long contact 0102 in center sets up the screw thread post, and the screw hole of centerline pole 0101 and the screw thread post threaded connection of the long contact 0102 in center set up the screw hole on gear contact 9, and the lower extreme of the short contact 091 in gear sets up the screw thread post, and the screw hole of gear contact 9 and the screw thread post threaded connection of the short contact 091 in gear.

Preferably, the connection mode of the gear position contact 9 and the center contact 10 can also be selected as follows:

the upper end of the gear position wire rod 092 and the lower end of the bending part at the upper end of the central wire rod 0101 are both provided with inserting columns, the lower end of the gear position short contact 091 and the upper end of the central long contact 0102 are both provided with inserting holes, the periphery of the lower end of the gear position short contact 091 and the periphery of the upper end of the central long contact 0102 are both provided with external threads,

the gear short contacts 091 and the gear line rod 092 are mutually connected in an inserted manner, the gear short contacts 091 and the gear line rod 092 are tightly connected outside the gear short contacts 091 at the insertion position of the two through first nuts 093, and the first nuts 093 at the connection position of each gear short contact 091 and the gear line rod 092 are fixed in the first stepped holes of the chassis 8. The central long contact 0102 and the central line rod 0101 are similarly in plug connection, the central long contact 0102 and the central line rod 0101 are tightly connected through a second nut 0103 at the outside of the central long contact 0102 at the plug connection position of the central long contact 0102 and the central line rod 0101, and the second nut 0103 at the connection position of the central long contact 0102 and the central line rod 0101 is fixed in a second stepped hole of the intermediate disk 7.

Further, a polytetrafluoroethylene gasket 15 is arranged between the chassis 8 and the intermediate disc 7, a plurality of stepped holes coaxially corresponding to each gear contact 9 are arranged in a circumferential array on the polytetrafluoroethylene gasket 15, a contact end of each gear contact 9 is supported by the corresponding step Kong Qiantao, and a contact surface between the central contact 10 and the gear contact 9 is located in each stepped hole.

Specifically, in order to further reduce friction between the center contact 10 and the gear position contact 9, the polytetrafluoroethylene gasket 15 is nested in the circular groove of the chassis 8, the polytetrafluoroethylene gasket 15 is a circular sheet, a flange table of the gear position contact is supported in a stepped hole of the polytetrafluoroethylene gasket 15, and when the lower end of each center contact 10 is in contact with the upper end of the gear position contact 9, a friction contact surface is located in the stepped hole, so that diffusion of contact friction sparks can be effectively avoided.

Further, the upper end of the connecting rod 2 is provided with a rotary handle 1, the rotary handle 1 is of a circular disc-shaped structure, the rotary handle 1 is fixed at the upper end of the connecting rod 2 by radially arranging screws at the periphery of the rotary handle 1, and the rotary handle 1 can be conveniently driven to move along with the connecting rod 2 by lifting.

See again fig. 3-8. The utility model discloses a gear auto-change over device explains when using to the three-gear auto-change over device of this embodiment. In the embodiment, the shift position is switched by rotating after the rotating handle 1 is pulled, and then the rotating handle 1 is reset under the action of the spring 13 to realize the communication between the contacts 9 in three different shift positions and the central contact 10. The method comprises the following specific steps:

assuming that a central contact 10 which rotates with the rotating handle 1 at the same time is a mark symbol 0, and the mark symbols of the three gear positions 9 on the rest chassis 8 are respectively 1, 2 and 3, the mark position 0 central contact 10 is in contact communication with the mark position 1 gear position 9 at the initial position, and at this time, 2 blocking pieces 5 are respectively positioned between 2 optical intermittent sensors 4;

after the rotating handle 1 is lifted and rotated for 120 degrees, the rotating handle is reset, at the moment, a second position 0 marking position center contact 10 is communicated with a second position marking position contact 9 in a contact mode, and a blocking piece 5 blocks the middle of an optical discontinuity sensor 4 indicating a marking symbol position A;

after the rotary handle 1 is pulled and rotated for 120 degrees again for resetting, the central contact 10 of the marking position of the third position 0 and the gear contact 9 of the marking position 3 are communicated in a contact way, and the other barrier piece 5 blocks the middle of the optical intermittent sensor 4 indicating the marking symbol position B;

the second rotation requires two opposite rotations in the forward direction and can return to the second or initial position.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.

Claims (10)

1. A high-voltage gear switching device for cable testing comprises a fixed frame, wherein a base plate is arranged on a bottom plate of the fixed frame, a plurality of gear contacts are arranged on the circumference of the lower end of the base plate in an equidistant array manner, the lower end of each gear contact penetrates out of the base plate and then extends out of the bottom of the fixed frame, and the upper end of each gear contact is exposed out of the base plate; the upper end of the base plate is sleeved with an intermediate plate, a screw rod is sleeved in the intermediate plate, the lower end of the screw rod is fixedly connected with the base plate in a threaded manner, a spring is sleeved on the periphery of the screw rod in the intermediate plate, a through hole penetrating through the intermediate plate is formed in an eccentric axis of the intermediate plate, the axis of the through hole is located on a virtual center circle of the gear contact array, a J-shaped center contact is sleeved in the screw rod, the upper end of the center contact penetrates through the screw rod and then extends into the through hole, the lower end of the center contact extends out of the bottom of the fixed frame, a connecting plate is fixed at the upper end of the intermediate plate and limits the screw rod in the intermediate plate, a connecting rod is arranged at the upper end of the connecting plate, and the upper end of the connecting rod extends out of the fixed frame; and the connecting rod is rotated by lifting, and the middle disc drives the central contact to rotate, so that the upper end of the central contact is in contact connection with the upper ends of the exposed gear contacts at different array positions on the chassis.

2. The high-voltage gear shifting device for cable testing according to claim 1, wherein the top plate of the fixed frame is provided with optical discontinuity sensors at intervals on the outer peripheral surface, the upper end of the connecting pad is provided with blocking pieces at intervals on the outer peripheral surface, the blocking pieces correspond to the optical discontinuity sensors, and when the center contact contacts with the gear contacts at different positions respectively, the blocking pieces at different positions extend into the corresponding optical discontinuity sensors to trigger the optical discontinuity sensors to indicate that the gear contacts at different positions are connected with the center contact.

3. The high-voltage gear shifting device for cable testing according to claim 1 or 2, wherein two limiting rods are arranged on a bottom plate of the fixing frame in a circumferential array manner, the limiting rods are located on the periphery of the base plate, a stop rod extending outwards is arranged on the periphery of the intermediate plate, and the intermediate plate is limited by the stop rod in an obtuse angle range formed by connecting two adjacent gear contacts and the center of the virtual center circle when rotating around the base plate.

4. The high-voltage gear shifting device for cable testing according to claim 3, wherein when the contact of the stop lever with one of the limiting levers is limited, one of the gear contacts is communicated with the center contact.

5. The high-voltage gear shifting device for the cable test according to claim 4, wherein the gear contact is formed by connecting a gear line rod and a gear short contact, and the lower end of the gear short contact is in threaded connection with the upper end of the gear line rod; the central contact is formed by connecting a central line rod and a central long contact, the upper end of the central long contact is in threaded connection with the bent end part of the upper end of the central line rod, and the central contact rotates to drive the lower end of the central long contact to be in contact connection with the upper ends of the gear short contacts at different array positions respectively.

6. The high-voltage gear shifting device for cable testing according to claim 5, wherein a polytetrafluoroethylene gasket is arranged between the chassis and the middle disc, a plurality of stepped holes coaxially corresponding to each gear contact are arranged on the polytetrafluoroethylene gasket in a circumferential array, and contact surfaces of the central contact and the gear contacts are located in the stepped holes.

7. A high-voltage range switching device for cable testing according to claim 6, wherein: the periphery of the gear contact and the periphery of the center contact are wrapped by insulating layers.

8. A high-voltage range switching device for cable testing according to claim 7, wherein: the fixed frame is of a frame structure, and the periphery of a bottom plate and the periphery of a top plate of the fixed frame are connected into a whole up and down through supporting columns; the lower end of the connecting rod is fixedly connected with the connecting disc, and the upper end of the connecting rod is provided with a rotary handle.

9. The high-voltage gear shifting device for cable testing according to claim 2, wherein the number of the gear contacts is 3, the optical discontinuity sensors are respectively disposed on the top plate of the fixed frame at an interval of 120 °, and the barrier pieces are respectively disposed on the upper end of the connecting disc at an interval of 120 °.

10. The high-voltage gear shifting device for cable testing according to claim 8, wherein the two limiting rods are spaced 90 ° from each other, and the stop rod is limited by the limiting rods within an included angle of 240 °.

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