Expandable switchgear busbar grounding device

Abstract

The invention discloses an expansion type switch cabinet busbar grounding device, which relates to the technical field of busbar grounding devices, including a plum blossom contact, the plum blossom contact including a central tube, a plurality of contact pieces movably arranged on the peripheral side of the central tube, and an annular spring sleeved on each contact piece; the inner side of each contact piece has an arc-shaped driving block, the peripheral side of the central tube is provided with a driving hole corresponding to each contact piece, and each driving block extends to the interior of the central tube through the driving hole; and also includes a propulsion mechanism, the propulsion mechanism includes an outer tube, a push rod and a cone head, the push rod is slidably connected in the outer tube along the length direction, and one end of the push rod extending to the outside of the outer tube is fixedly connected with the cone head; the outer tube and the central tube are detachably coaxially sleeved, and the push rod slides along the outer tube in the process of the push rod sliding through the cone head to squeeze each driving block to expand each contact piece synchronously. The invention is convenient and reliable to operate, occupies less space in the PT interval, and is convenient for maintenance personnel to repair the PT interval.

Description

Technical Field

[0001] The invention relates to the technical field of busbar grounding devices, in particular to an expansion type switch cabinet busbar grounding device. Background Art

[0002] The process of installing grounding wires on the busbars of high-voltage indoor switch cabinets is cumbersome and the space is small. When installing the grounding wires, the grounding wires are often loose, unstable, or fall off. Therefore, it takes a long time for operation and maintenance personnel to complete the grounding operation of the busbars of the high-voltage switch cabinets, which poses a great risk of safety. In addition, in order to enhance the protection level of the overall switch cabinets, the side windows for hanging grounding wires have been completely cancelled, making it more difficult to reliably ground the busbars of the high-voltage switch cabinets.

[0003] For this purpose, grounding trolleys for switch cabinets have been widely used. After the PT interval manual switch trolley is shaken out, the grounding trolley is pushed into the PT interval to connect the grounding trolley with the switch cabinet busbar to achieve grounding, and the operation is relatively convenient.

[0004] However, there are still limitations when using a grounding trolley for busbar grounding. For example, the grounding trolley takes up a large space, and maintenance personnel cannot inspect the PT interval. Also, when a section of the busbar is shut down for maintenance and any switch trolley fails and cannot be swing out, the grounding trolley cannot be pushed into the PT interval due to the interlocking function, and the grounding operation cannot be completed in time. Summary of the invention

[0005] The purpose of the present invention is to provide an expandable switch cabinet busbar grounding device to solve the problem that the grounding trolley in the above-mentioned prior art occupies a large space, maintenance personnel cannot repair the PT interval, and the grounding trolley cannot be pushed into the PT interval.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: an expansion switch cabinet busbar grounding device, comprising a plum blossom contact, the plum blossom contact comprising a central tube, a plurality of contact pieces movably arranged on the peripheral side of the central tube, and an annular spring sleeved on each contact piece; the inner side of each contact piece has an arc-shaped driving block, the peripheral side of the central tube is provided with driving holes corresponding to each contact piece, and each driving block extends to the interior of the central tube through the driving hole; it also includes a propulsion mechanism, the propulsion mechanism comprises an outer tube, a push rod and a cone head, the push rod is slidably connected to the outer tube along the length direction, and one end of the push rod extending to the outside of the outer tube is fixedly connected to the cone head; the outer tube and the central tube are detachably coaxially sleeved, and the push rod slides along the outer tube and squeezes each driving block through the cone head to expand each contact piece synchronously.

[0007] Furthermore, a fixing ring is fixedly connected to the center tube, and a plurality of first limiting grooves distributed in a circular array are provided on the fixing ring; a rotating ring is coaxially rotatably connected to the center tube, and a plurality of first rotating shafts and a plurality of second limiting grooves corresponding to the limiting grooves are provided on the rotating ring, and an opening is provided on the side of the second limiting groove away from the center of the rotating ring, and a bayonet misaligned with the opening is provided on the side close to the center of the rotating ring; when assembling the plum blossom contact, when the rotating ring is rotated until the opening is aligned with the first limiting groove, each contact piece is respectively inserted into the corresponding first limiting groove and second limiting groove, the rotating ring is rotated to align each bayonet with the contact piece and to make each first rotating shaft pass through the rotating hole on each contact piece one by one, and the elastic force of the annular spring sleeved on each contact piece makes each contact piece inserted into the aligned bayonet.

[0008] Furthermore, the head end of each contact piece is rotatably connected to a movable contact arm via a second rotating shaft, one end of the movable contact arm is movably sleeved with a first torsion spring, the two end rods of the first torsion spring are cross-connected to the inner and outer sides of the head end of the contact piece, and the second rotating shaft is located between the two end rods of the first torsion spring.

[0009] Furthermore, the movable contact arm includes two contact arm units distributed on both sides of the corresponding contact sheet, and the inner side of each contact arm unit has at least two contact points.

[0010] Furthermore, at least one set of clamping structures is arranged between the central tube and the outer tube, and the clamping structure includes a special-shaped slide groove opened on the peripheral side surface of the central tube and a slide column fixedly connected to the peripheral side surface of the outer tube. The special-shaped slide groove includes a first slide groove distributed along the circumference of the central tube and passing through one end of the central tube, a third slide groove parallel to the first slide groove, and a second slide groove connecting the first slide groove and the third slide groove, and the slide column slidably cooperates with the special-shaped slide groove.

[0011] Furthermore, a rotating hoop is coaxially rotatably connected to the central tube, and at least one driving rod is fixedly connected to the rotating hoop; at least one protruding pad is fixedly connected to the peripheral side of the rotating hoop, and during the rotation of the rotating hoop on the central tube, there is a locking position in which the pad is inserted between the central tube and the tail end of one of the contact pieces; an elastic member is arranged between the rotating hoop and the central tube, and the process of the elastic member recovering its deformation drives the rotating hoop to move to the locking position, and the driving rod pushes the column rod in the second slide groove into the first slide groove.

[0012] Furthermore, the elastic member is a second torsion spring, the spring coil of the second torsion spring is movably sleeved on the second shaft rod on the central tube, one end rod of the second torsion spring is inserted into the central tube, and the other end rod is inserted into the fan-shaped groove on the rotating hoop.

[0013] Furthermore, a sliding sleeve is provided on the central tube, and the sliding sleeve is movably mounted on the rotating hoop. When the rotating hoop is rotated on the central tube to a locking position, the cushion block abuts against the sliding sleeve.

[0014] Furthermore, there are 2-4 clamping structures, and the clamping structures are distributed in a circular array along the circumference of the central tube.

[0015] Furthermore, the rotating ring is a conductor, the first rotating shaft is fixedly connected to the rotating ring through a conductor block, and at least one first rotating shaft is conductively connected to a grounding wire.

[0016] In the above technical scheme, the expandable switch cabinet busbar grounding device provided by the present invention connects the central tube of the plum blossom contact with the outer tube of the propulsion mechanism, and when the push rod is pushed, the driving blocks are squeezed by the cone head sliding contact to expand the contact pieces synchronously, so that the contact pieces can be smoothly sleeved on the busbar connector. After the propulsion mechanism is removed, the contact pieces are tightened by the annular spring to clamp the busbar connector. One propulsion mechanism can adapt to multiple plum blossom contacts, which is convenient and reliable to operate, occupies less space in the PT interval, and is convenient for maintenance personnel to repair the PT interval; and when a switch cabinet has a fault and the switch trolley cannot be shaken out, resulting in the grounding trolley being unable to be pushed into the PT interval, the plum blossom contact can also be sleeved by the propulsion mechanism from the gap between the switch trolley and the PT interval side plate onto the busbar connector to achieve rapid grounding operation, thereby improving maintenance efficiency and safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the drawings required to be used in the embodiments are briefly introduced below.

[0018] Figure 1 The overall structural diagram provided for the embodiment;

[0019] Figure 2 A schematic diagram of a local structure provided for an embodiment;

[0020] Figure 3 A partial structural cross-sectional view provided for an embodiment;

[0021] Figure 4 A schematic diagram of the structure of a plum blossom contact provided in an embodiment;

[0022] Figure 5 A schematic diagram of the connection structure between the central tube and the rotating hoop provided in the embodiment;

[0023] Figure 6 A schematic diagram of the structure of a rotating hoop provided in an embodiment;

[0024] Figure 7 A schematic diagram of the structure of the contact piece during installation provided by the embodiment;

[0025] Figure 8 A schematic diagram of the structure of the contact piece provided in the embodiment after installation is completed;

[0026] Fig. 9 A schematic diagram of the connection structure between the contact piece and the movable contact arm provided in the embodiment;

[0027] Fig.10 A schematic diagram of a movable contact arm structure provided in an embodiment;

[0028] Fig.11 A schematic diagram of the structure of a propulsion mechanism provided in an embodiment;

[0029] Fig.12 A schematic diagram of the structure in the locked position state provided in the embodiment.

[0030] Description of reference numerals:

[0031] 100, plum blossom contact; 200, propulsion mechanism; 1, center tube; 2, contact piece; 3, rotating hole; 4, driving block; 5, movable contact arm; 6, contact point; 7, first torsion spring; 8, annular spring; 9, fixing ring; 10, first limiting groove; 11, rotating ring; 12, first rotating shaft; 13, second limiting groove; 14, opening; 15, bayonet; 16, driving hole; 17, special-shaped slide groove; 171, first slide groove; 172, second slide groove; 173, third slide groove; 18, Sliding column; 19, rotating hoop; 20, driving rod; 21, cushion block; 22, second torsion spring; 23, second shaft rod; 24, fan-shaped groove; 25, conductor block; 26, grounding wire; 27, outer cylinder; 28, push rod; 29, cone head; 30, sliding sleeve; 31, end cover; 32, fixed handle; 33, movable handle; 34, round rod; 35, pressure plate; 36, bracket; 37, self-locking plate; 38, first spring; 39, second spring; 40, first shaft rod; 41, second rotating shaft. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] See also Figure 1-Figure 12 The expandable switch cabinet busbar grounding device provided by the embodiment of the present invention includes a plum blossom contact 100 and a propulsion mechanism 200. The plum blossom contact 100 includes a central tube 1, a plurality of contact pieces 2 and at least one annular spring 8. The number of contact pieces 2 is 6-10. Each contact piece 2 is rotatably connected to the circumferential side of the central tube 1 in a circular array. Each contact piece 2 can be synchronously rotated to expand or synchronously rotated to tighten relative to the central tube 1. The number of annular springs 8 is 1-3. Each annular spring 8 is sleeved on each contact piece 2. Each contact piece 2 includes two monomers bonded together.

[0034] The head end of each contact piece 2 is rotatably connected to a movable contact arm 5 via a second rotating shaft 41. Figure 9-10One end of the movable contact arm 5 is movably sleeved with a first torsion spring 7, the coil of the first torsion spring 7 is movably sleeved on the first shaft 40 at the end of the movable contact arm 5, the two end rods of the first torsion spring 7 are cross-shaped and abut against the inner and outer sides of the head end of the contact piece 2, and the second rotating shaft 41 is located between the two end rods of the first torsion spring 7. The movable contact arm 5 includes two contact arm units distributed on both sides of the corresponding contact piece 2, and each contact arm unit has at least two contacts 6 on the inner side.

[0035] An arc-shaped driving block 4 is provided inside each contact piece 2 , and driving holes 16 corresponding to each contact piece 2 are provided on the circumference of the central tube 1 , and each driving block 4 extends into the interior of the central tube 1 through the driving holes 16 .

[0036] The propulsion mechanism 200 includes an outer cylinder 27, a push rod 28, a cone head 29 and an operating member. The push rod 28 is slidably connected in the outer cylinder 27 along the length direction. One end of the push rod 28 extending outside the outer cylinder 27 is fixedly connected to the cone head 29. The operating member can make the push rod 28 slide on the outer cylinder 27. The outer cylinder 27 and the central cylinder 1 are detachably coaxially sleeved by a clamping structure. When the push rod 28 slides along the outer cylinder 27, it can slide and squeeze each driving block 4 through the cone head 29, so as to expand each contact piece 2 synchronously.

[0037] In the present invention, the central tube 1 of the plum blossom contact 100 is connected to the outer tube 27 of the pushing mechanism 200, and the plum blossom contact 100 is sent into the PT interval through the outer tube 27. When the push rod 28 is pushed, the driving blocks 4 are squeezed by the conical head 29 to expand the contact pieces 2 synchronously, so that each contact piece 2 can be smoothly sleeved on the busbar joint. After the pushing mechanism 200 is removed, each contact piece 2 is tightened by the annular spring 8 to clamp the busbar joint. One pushing mechanism 200 can adapt to multiple plum blossom contacts 100, which is convenient and reliable to operate, occupies less space in the PT interval, and is convenient for maintenance personnel to repair the PT interval; and when a switch trolley fails to be shaken out due to a fault in a switch cabinet, resulting in the grounding trolley being unable to be pushed into the PT interval, the plum blossom contact 100 can also be sleeved on the busbar joint from the gap between the switch trolley and the PT interval side plate by the pushing mechanism 200, so as to achieve rapid grounding operation, thereby improving maintenance efficiency and safety.

[0038] The contact piece 2 head of the ordinary plum blossom tentacle can only achieve single-point clamping and single-point electrical connection with the busbar connector, and the clamping strength and conductivity need to be improved. The setting of the movable contact arm 5 in the present invention can make the plum blossom contact 100 clamp the busbar connector more firmly and have a better conductive effect. The elastic force of the first torsion spring 7 keeps the movable contact arm 5 relatively flush with the contact piece 2. Whether the movable contact arm 5 rotates forward or reverse relative to the contact piece 2, the special arrangement of the first torsion spring 7 makes the first torsion spring 7 elastically deform. When the movable contact arm 5 squeezes the busbar connector, the movable contact arm 5 overcomes the elastic force of the first torsion spring 7 and makes each contact 6 abut against the busbar connector, thereby clamping the busbar connector more firmly and achieving a better conductive effect. Moreover, when the busbar connector has a taper, the movable contact arm 5 can also be flexibly adapted so that each contact 6 of the movable contact arm 5 can abut against the conical surface of the busbar connector. Once removed from the busbar connector, the first torsion spring 7 will quickly reset the movable contact arm 5.

[0039] The present invention also improves the arrangement of the contact pieces 2 of the plum blossom contact 100. Specifically, a fixing ring 9 is coaxially fixedly connected to the center tube 1. The fixing ring 9 is provided with a plurality of first limiting grooves 10 distributed in a circumferential array. The first limiting grooves 10 penetrate the peripheral side of the fixing ring 9. The width of the first limiting groove 10 matches the thickness of a contact piece 2. A rotating ring 11 is coaxially rotatably connected to the center tube 1. The rotating ring 11 is provided with a plurality of first rotating shafts 12 and a plurality of second limiting grooves 13. The number of the first rotating shafts 12, the second limiting grooves 13 and the first limiting grooves 10 is the same, and the three correspond to each other one by one. The second limiting groove 13 is wider than the first limiting groove 10. An opening 14 is provided on the side of the second limiting groove 13 away from the center of the rotating ring 11, and a bayonet 15 is provided on the side close to the center of the rotating ring 11. The bayonet 15 is misaligned with the opening 14.

[0040] The above scheme can facilitate the assembly and disassembly of the plum blossom contact 100. When assembling the plum blossom contact 100, the rotating ring 11 is rotated until the opening 14 is aligned with the first limiting groove 10 in the axial direction of the central tube 1, and each contact piece 2 is respectively inserted into each group of corresponding first limiting grooves 10 and second limiting grooves 13, and then the rotating ring 11 is rotated. On the one hand, each bayonet 15 is aligned with the contact piece 2 and the corresponding first limiting groove 10 in the axial direction of the central tube 1, and the contact piece 2 falls into the bayonet 15, so that the contact piece 2 is limited in the bayonet 15, and the elastic force of the annular spring 8 can prevent each contact piece 2 from exiting the bayonet 15. On the other hand, each first rotating shaft 12 is inserted into the rotating hole 3 on the corresponding contact piece 2, so that the contact piece 2 can rotate through the cooperation of the rotating hole 3 and the first rotating shaft 12. When disassembling the plum blossom contact 100, first remove the annular spring 8 from each contact piece 2, then rotate the contact piece 2 along the first rotating shaft 12 to disengage the contact piece 2 from the bayonet 15, and then rotate the rotating ring 11 to align the opening 14 with the corresponding contact piece 2 on the one hand, and to withdraw the first rotating shaft 12 from the corresponding rotating hole 3 on the other hand, and then each contact piece 2 can be removed from the first limiting groove 10 and the second limiting groove 13 one by one.

[0041] The rotating ring 11 is a conductor, and each first rotating shaft 12 is fixedly connected to the rotating ring 11 through a conductor block 25. At least one first rotating shaft 12 is conductively connected to a grounding wire 26, and the first rotating shaft 12 is also a conductor. In this way, the grounding wire 26 is conductively connected to all the contact pieces 2 through the rotating ring 11, and each contact piece 2 is conductively connected to the busbar connector, thereby achieving a good grounding relationship between the grounding wire 26 and the busbar connector.

[0042] As a further preferred technical solution of the present invention, a plurality of clamping structures are arranged between the central tube 1 and the outer tube 27, the number of the clamping structures is at least one, the number of the clamping structures is preferably 2-4, and each clamping structure is distributed in a circumferential array along the circumference of the central tube 1. Each clamping structure includes a special-shaped slide groove 17 and a slide column 18, the special-shaped slide groove 17 is arranged on the circumferential side surface of the central tube 1, the slide column 18 is fixedly connected to the circumferential side surface of the outer tube 27, the slide column 18 and the special-shaped slide groove 17 are slidably matched, the special-shaped slide groove 17 is J-shaped, and the special-shaped slide groove 17 includes a first slide groove 171, a second slide groove 172 and a third slide groove 173, the first slide groove 171 is distributed along the circumference of the central tube 1 and passes through one end of the central tube 1, the third slide groove 173 is parallel to the first slide groove 171, and the second slide groove 172 connects the first slide groove 171 and the third slide groove 173. A rotating hoop 19 is coaxially rotatably connected to the center tube 1, at least one driving rod 20 is fixedly connected to the rotating hoop 19, at least one protruding cushion block 21 is fixedly connected to the peripheral side surface of the rotating hoop 19, and the rotating hoop 19 has a locking position in which the cushion block 21 is inserted between the center tube 1 and the tail end of one of the contact pieces 2 during the rotation of the center tube 1. A sliding sleeve 30 is provided on the peripheral side surface of the center tube 1, and the sliding sleeve 30 is movably sleeved on the rotating hoop 19. When the rotating hoop 19 rotates to the locking position on the center tube 1, the cushion block 21 abuts against the sliding sleeve 30, thereby limiting the rotation stroke of the rotating hoop 19. A second torsion spring 22 is provided between the rotating hoop 19 and the center tube 1. The coil of the second torsion spring 22 is movably sleeved on the second shaft rod 23 on the peripheral side of the center tube 1. One end rod of the second torsion spring 22 is inserted into the peripheral side of the center tube 1, and the other end rod is inserted into the fan-shaped groove 24 on the rotating hoop 19. The elastic force of the second torsion spring 22 drives the driving rod 20 to abut and cooperate with the side of the slide column 18 located in the second slide groove 172 and the third slide groove 173. The second torsion spring 22 can also be replaced by other elastic members, such as a tension spring. During assembly, the process of requiring the elastic member to restore its deformation drives the rotating hoop 19 to move to the locking position, and the driving rod 20 pushes the column located in the second slide groove 172 into the first slide groove 171.

[0043] When the outer cylinder 27 is engaged with the center cylinder 1, the outer cylinder 27 is inserted into the center cylinder 1 and rotates. When the slide post 18 slides into the third slide slot 173 via the first slide slot 171 and the second slide slot 172, the engagement between the outer cylinder 27 and the center cylinder 1 is achieved. During the process of the slide post 18 sliding from the second slide slot 172 into the third slide slot 173, the slide post 18 overcomes the elastic force of the elastic member to squeeze the drive rod 20 to rotate the rotating hoop 19 out of the locking position. At this time, the cushion block 21 no longer restricts the rotation of the contact piece 2, so that the pushing cone head 29 can squeeze each drive block 4 to rotate and expand each contact piece 2. The plum blossom contact 100 can be smoothly inserted into the busbar connector; then the cone head 29 is retreated and separated from the drive block 4, and the elastic force of the annular spring 8 causes each contact piece 2 to clamp the busbar connector to achieve busbar grounding; then the outer cylinder 27 is removed from the center cylinder 1, and the outer cylinder 27 is first pushed along the insertion direction of the center cylinder 1, and then the outer cylinder 27 is rotated and pulled out, that is, the slide post 18 slides out of the first slide groove 171 through the third slide groove 173 and the second slide groove 172, that is, the separation between the outer cylinder 27 and the center cylinder 1 is achieved, and the slide post 18 gradually loses the drive when sliding out of the second slide groove 172. The squeezing pressure of the movable rod 20 and the elastic force of the elastic member are gradually restored, so that the rotating hoop 19 is rotated and reset to the locking position, and the cushion block 21 is again inserted under the contact piece 2, so that the contact piece 2 cannot rotate along the first rotating shaft 12. Therefore, even if the plum blossom contact 100 is forcibly pulled by the grounding wire, the contact pieces 2 will not rotate and expand, which not only improves the connection firmness and good conductivity between the plum blossom contact 100 and the busbar connector, but also can effectively avoid the situation where the plum blossom contact 100 is separated from the busbar due to accidental pulling or stepping on the grounding wire, thereby greatly improving the safety of the switch cabinet during maintenance operations.

[0044] The propulsion mechanism 200 includes an outer cylinder 27, a push rod 28 and a cone head 29. Fig.12 , and also includes an end cover 31 screwed on one end of the outer tube 27. A handle is fixedly connected to the end of the push rod 28 away from the cone head 29. The cone head 29 can be driven to move through the push rod 28 by pushing / pulling the handle.

[0045] In another embodiment, see Fig.11In addition to the outer cylinder 27, the push rod 28 and the cone head 29, the propulsion mechanism 200 also includes an end cover 31, a fixed handle 32, a movable handle 33, a round rod 34, a pressure plate 35, a self-locking plate 37, a first spring 38 and a second spring 39, wherein the fixed handle 32 is fixedly connected to the end cover 31 through a bracket 36, the end cover 31 is screwed to the end of the outer cylinder 27, the movable handle 33 is rotatably connected to the fixed handle 32, the movable handle 33 is fixedly connected or rotatably connected to the round rod 34, and the pressure plate 35 is self-locking. The first spring 38 is sleeved on the push rod 28, one end of the pressure plate 35 can abut against the protrusion on the bracket 36, and the other end can abut against the round rod 34. The first spring 38 is sleeved on the push rod 28, one end of the first spring 38 abuts against the pressure plate 35, and the other end abuts against the end cover 31. The middle part of the self-locking plate 37 is movably inserted into the push rod 28, one end of the self-locking plate 37 is hinged on the bracket 36, and the second spring 39 is sleeved on the push rod 28, one end of the second spring 39 abuts against the self-locking plate 37, and the other end abuts against the bracket 36.

[0046] When the push rod 28 is in the state of being pressed by the movable handle 33, the movable handle 33 squeezes one end of the pressing plate 35 through the round rod 34, and the pressing plate 35 is tilted due to the elastic force of the first spring 38. The inclined pressing plate 35 and the push rod 28 conflict with each other and generate a large friction force. The pressing plate 35 pressed by the round rod 34 to move toward the end cover 31 drives the push rod 28 to move together. The first spring 38 is compressed. At the same time, the self-locking plate 37 is squeezed by the second spring 39 and tilted, thereby conflicting with the push rod 28 and generating a large friction force. When the push rod 28 is driven to move by the pressing plate 35, the self-locking plate 37 is driven by the friction force to overcome the elastic force of the second spring 39 and rotate. When the self-locking plate 37 rotates to be parallel to the end surface of the end cover 31, the friction between the self-locking plate 37 and the push rod 28 disappears, and the push rod 28 can slide relative to the self-locking plate 37, thereby making the push rod 28 When the movable handle 33 is pressed into place, the push rod 28 no longer moves relative to the bracket 36, and the elastic force of the second spring 39 squeezes the self-locking plate 37, causing the self-locking plate 37 to rotate relative to the support rod until the self-locking plate 37 tilts again to contact with the push rod 28 and generates a large friction force; thereafter, when the movable handle 33 is released, the elastic force of the first spring 38 squeezes the pressing plate 35, causing the pressing plate 35 to move in the direction away from the end cover 31 until the pressing plate 35 contacts the protrusion on the bracket 36, and the pressing plate 35 also rotates the movable handle 33 through the round rod 34 to move away from the fixed handle 32. At the same time, due to the contact between the self-locking plate 37 and the push rod 28, the push rod 28 is self-locked, so the push rod 28 will not retreat; by pressing the movable handle 33 back and forth in this way, the push rod 28 and the cone head 29 can be gradually advanced. When the pushed push rod 28 needs to be retracted, it is only necessary to overcome the elastic force of the second spring 39 and manually press the self-locking plate 37 to a state parallel to the end cover 31, and then the push rod 28 can be easily pulled out.

[0047] The above describes some exemplary embodiments of the present invention, which should not be understood as limiting the scope of protection of the claims of the present invention. For those skilled in the art, the described embodiments can be modified in other different ways without departing from the spirit and scope of the present invention.

Claims

1. An expansion switch cabinet busbar grounding device, comprising a plum blossom contact, wherein the plum blossom contact comprises a central tube, a plurality of contact pieces movably arranged on the peripheral side of the central tube, and an annular spring sleeved on each contact piece; characterized in that: The inner side of each contact piece has an arc-shaped driving block, and the peripheral side of the central tube is provided with driving holes corresponding to each contact piece, and each driving block extends to the interior of the central tube through the driving hole; It also includes a propulsion mechanism, which includes an outer tube, a push rod and a cone head. The push rod is slidably connected in the outer tube along the length direction, and one end of the push rod extending outside the outer tube is fixedly connected to the cone head; The outer cylinder and the central cylinder are detachably coaxially sleeved, and the push rod slides along the outer cylinder, and the cone head slides and squeezes each driving block to expand each contact piece synchronously; A fixing ring is fixedly connected to the central tube, and a plurality of first limiting grooves distributed in a circumferential array are formed on the fixing ring; A rotating ring is coaxially connected to the central tube, and the rotating ring is provided with a plurality of first rotating shafts and a plurality of second limiting grooves corresponding to the limiting grooves one by one. An opening is provided on the side of the second limiting groove away from the center of the rotating ring, and a bayonet misaligned with the opening is provided on the side close to the center of the rotating ring. When assembling the plum blossom contacts, when the rotating ring is rotated until the opening is aligned with the first limit groove, each contact piece is respectively inserted into the corresponding first limit groove and second limit groove, the rotating ring is rotated to align each bayonet with the contact piece and to make each first rotating shaft pass through the rotating hole on each contact piece one by one, and the elastic force of the annular spring sleeved on each contact piece makes each contact piece be inserted into the aligned bayonet.

2. The expandable switch cabinet busbar grounding device according to claim 1, characterized in that: The head end of each contact piece is rotatably connected to a movable contact arm via a second rotating shaft. One end of the movable contact arm is movably sleeved with a first torsion spring. The two end rods of the first torsion spring are cross-connected to the inner and outer sides of the head end of the contact piece, and the second rotating shaft is located between the two end rods of the first torsion spring.

3. The expandable switch cabinet busbar grounding device according to claim 2, characterized in that: The movable contact arm comprises two contact arm units distributed on both sides of the corresponding contact sheet, and the inner side of each contact arm unit has at least two contact points.

4. The expandable switch cabinet busbar grounding device according to claim 1, characterized in that: At least one set of clamping structures is arranged between the central tube and the outer tube, and the clamping structure includes a special-shaped slide groove opened on the peripheral side surface of the central tube and a slide column fixedly connected to the peripheral side surface of the outer tube. The special-shaped slide groove includes a first slide groove distributed along the circumference of the central tube and passing through one end of the central tube, a third slide groove parallel to the first slide groove, and a second slide groove connecting the first slide groove and the third slide groove. The slide column slides in cooperation with the special-shaped slide groove.

5. The expandable switch cabinet busbar grounding device according to claim 4, characterized in that: The central tube is coaxially rotatably connected with a rotating hoop, and the rotating hoop is fixedly connected with at least one driving rod; At least one protruding pad is fixedly connected to the peripheral side surface of the rotating hoop, and during the rotating hoop rotating on the central cylinder, there is a locking position for padding the pad between the central cylinder and the tail end of one of the contact pieces; An elastic member is arranged between the rotating hoop and the central tube. The elastic member drives the rotating hoop to move to the locking position during the process of restoring its deformation, and the driving rod pushes the column rod in the second sliding groove into the first sliding groove.

6. The expandable switch cabinet busbar grounding device according to claim 5, characterized in that: The elastic member is a second torsion spring, the spring coil of the second torsion spring is movably sleeved on the second shaft rod on the central tube, one end rod of the second torsion spring is inserted into the central tube, and the other end rod is inserted into the fan-shaped groove on the rotating hoop.

7. The expandable switch cabinet busbar grounding device according to claim 5, characterized in that: The central tube is provided with a sliding sleeve, which is movably sleeved on the rotating hoop. When the rotating hoop is rotated on the central tube to a locking position, the cushion block abuts against the sliding sleeve.

8. The expandable switch cabinet busbar grounding device according to claim 5, characterized in that: There are 2 to 4 clamping structures, and each clamping structure is distributed in a circular array along the circumference of the central tube.

9. The expandable switch cabinet busbar grounding device according to claim 1, characterized in that: The rotating ring is a conductor, the first rotating shaft is fixedly connected to the rotating ring through a conductor block, and at least one first rotating shaft is conductively connected to a grounding wire.

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