CN113054581B

CN113054581B - Mls low pressure pull-out type cubical switchboard

Info

Publication number: CN113054581B
Application number: CN202110392735.3A
Authority: CN
Inventors: 边沛; 陈珊莹
Original assignee: Zhejiang Zhaoshan Electrical Appliance Co ltd
Current assignee: Zhejiang Zhaoshan Electrical Appliance Co ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-08-31
Anticipated expiration: 2041-04-13
Also published as: CN113054581A; CN113629569A

Abstract

The invention belongs to the technical field of switch cabinets, and particularly relates to an mls low-voltage draw-out type switch cabinet which comprises a cabinet body, a drawer unit, a circuit breaker, a fuse, a current transformer, an ammeter and an indicator light. When the drawer unit breaks down and high-temperature or high-pressure gas is generated, the gas in the drawer unit can be smoothly discharged after the bracket moves out relative to the U-shaped cabinet plate, so that explosion is prevented. The first and second connectors do not create excessive resistance during the explosion.

Description

Mls low pressure pull-out type cubical switchboard

Technical Field

The invention belongs to the technical field of switch cabinets, and particularly relates to an mls low-voltage draw-out type switch cabinet.

Background

The MLS series low-voltage switch cabinet comprises a fixing technology and a drawer technology, and mainly comprises a power center cabinet, a motor control center cabinet and a power factor automatic compensation; the MLS system can meet the requirements of various power supply and distribution, and can be widely applied to various industrial and mining enterprise power distribution systems such as land use, power stations, nuclear power stations, ships, oil platforms and the like.

The draw-out switch cabinet is a closed shell made of steel plates, electrical components of incoming and outgoing lines are all installed in a drawer capable of being drawn out to form functional units capable of completing a certain type of power supply task, isolation measures are also provided among the functional units, and the draw-out switch cabinet is high in reliability, safety and interchangeability and is an advanced switch cabinet. Most of the switch cabinets produced at present are draw-out switch cabinets, and the draw-out switch cabinets are suitable for industrial and mining enterprises and high-rise buildings which require high power supply reliability.

However, the existing switch cabinet has the following disadvantages:

1. one of them drawer of current pull-out type cubical switchboard will bear more or heavier components and parts, including quiet inserting, mother inserts the power of dialling of inserting between, very hard when operating personnel takes the drawer out, and because the atress is uneven, the pull is not smooth and easy, causes very probably like this that the drawer drops from the cabinet body and damages electronic components or cubical switchboard.

2. The connecting piece between the switch and the rear bottom plate in the existing switch cabinet is connected in a socket type manner, and when a user pulls out or puts in the drawer, great force is needed, so that the drawer cannot be pulled conveniently; and the long-term use can cause the connecting piece to become loose, influences the connection of connecting piece.

3. The existing switch cabinet can cause electric arc after the connecting piece becomes loose, and the connecting piece is burnt out due to overheating.

4. The low-voltage switch cabinet can also generate high-pressure or high-temperature gas when a fault occurs, and the current pressure-relief explosion-proof device produced at home and abroad can push the drawer outwards for a certain distance to relieve pressure after generating the high-pressure or high-temperature gas; however, the switch cabinet is not easy to push out due to the connection pressure of the movable and static connectors in the switch cabinet, the gravity of the switch cabinet and the friction force between the switch cabinet and the cabinet body, and the gas in the drawer is required to reach a certain pressure, but under the pressure, components in the drawer are likely to be damaged due to impact.

The invention designs an mls low-voltage draw-out type switch cabinet to solve the problems.

Disclosure of Invention

In order to solve the defects in the prior art, the invention discloses an mls low-voltage draw-out type switch cabinet, which is realized by adopting the following technical scheme.

An mls low-voltage draw-out type switch cabinet comprises a cabinet body, a drawer unit, a circuit breaker, a fuse, a current transformer, an ammeter and an indicator lamp, wherein the cabinet body is divided into a front part and a rear part which are separated by a partition plate, the front end of the cabinet body is provided with a plurality of uniformly distributed drawer openings, the partition plate is provided with two groups of symmetrically distributed fixing grooves, and three fixing grooves in each group are uniformly distributed on the partition plate; the drawer units are slidably arranged in the drawer openings in a one-to-one correspondence mode.

A first connecting piece is fixedly arranged in each fixing groove; one end of the first connecting piece is provided with a second electric connecting column, and the other end of the first connecting piece is provided with bulges which are symmetrically distributed transversely up and down.

The drawer unit comprises a drawer outer baffle, a U-shaped cabinet plate, a trigger adjusting mechanism and a bracket, wherein four corners of the lower side of the U-shaped cabinet plate are rotatably provided with four rotating wheels, and the U-shaped cabinet plate is slidably arranged in the corresponding drawer openings through the four rotating wheels; the support is slidably mounted on the U-shaped cabinet plate, the drawer outer baffle is fixedly mounted on the support and positioned on the front side of the cabinet body, six uniformly distributed mounting plates are mounted at one end of the support, which is far away from the drawer outer baffle, and each mounting plate is provided with a mounting groove; one end of the second connecting piece is of a fork-shaped structure, a plurality of grooves are symmetrically formed in two inner end faces of the fork-shaped structure, and the other end of the second connecting piece is provided with a first electric connecting column; the six second connecting pieces are fixedly arranged on the bracket through six mounting grooves; six second connecting pieces are matched with six first connecting pieces in a one-to-one correspondence mode, and after the first connecting pieces are matched with the second connecting pieces, the protrusions on the first connecting pieces are in clamping fit with the grooves on the second connecting pieces.

An upper pressing block and a lower pressing block are arranged on the upper side and the lower side of each second connecting piece, and the upper pressing block and the lower pressing block are in transmission synchronous connection through a toothed plate and a gear; the fourth pinion rack is transversely installed at the rear side of support in a sliding manner, six trigger blocks are fixedly installed on the lower side of the fourth pinion rack uniformly, and the six trigger blocks are matched with six upper press block inclined planes.

The first rotating shaft is rotatably arranged on the bracket, and one end of the first rotating shaft penetrates through the outer baffle of the drawer and is fixedly provided with a first switch handle; the fourth rotating shaft is rotatably arranged on the bracket, and one end of the fourth rotating shaft is in transmission connection with the other end of the first rotating shaft through the trigger adjusting mechanism; the third rotating shaft is rotatably arranged on the bracket, and one end of the third rotating shaft is in transmission connection with the other end of the fourth rotating shaft through two gears with different radiuses; the ninth gear is fixedly arranged at the other end of the third rotating shaft and is meshed with the fourth toothed plate.

The trigger adjusting mechanism comprises a limiting clamping plate, an arc-shaped shell, a limiting shell, a second spring, an arc-shaped sliding block and an arc-shaped sliding strip, wherein the arc-shaped shell is fixedly arranged on the fourth rotating shaft, the arc-shaped sliding strip is slidably arranged on the arc-shaped shell, and one end of the arc-shaped sliding strip is connected with the first rotating shaft through a connecting plate; an arc-shaped sliding block is fixedly arranged on the arc-shaped sliding strip, the arc-shaped sliding block is positioned in the arc-shaped shell, and a pre-pressed second spring is arranged between the arc-shaped sliding block and the inner end face of the arc-shaped shell; the other end fixed mounting of arc draw runner has spacing cardboard, installs spacing shell between spacing cardboard and the arc shell, and under the effect of spacing shell, the second spring pre-compaction.

The circuit breaker is arranged on the upper side of the U-shaped cabinet plate; the second rotating shaft is rotatably arranged on the drawer outer baffle, and the second switch handle is arranged on the drawer outer baffle and is fixed with the second rotating shaft; the other end of the second rotating shaft is fixedly provided with a U-shaped driving plate, a switch board for controlling the switch is arranged on the circuit breaker, and the U-shaped driving plate is clamped on the switch board.

As a further improvement of the technology, an automatic switch adjusting mechanism is arranged on one side of the first rotating shaft, which is close to the outer baffle of the drawer.

The automatic switch adjusting mechanism comprises a first gear, a spring fixing plate, a second gear, a first spring, a limiting plate, a connecting column and a transmission plate, wherein the first gear is fixedly arranged on a first rotating shaft, the second gear is rotatably arranged on an outer baffle of the drawer, and the second gear is meshed with the first gear; the spring fixing plate is fixedly arranged on the outer baffle of the drawer; a transmission plate is fixedly arranged on the second gear, and the connecting column is rotatably arranged on the transmission plate; a pre-tensioned first spring is arranged between the connecting column and the spring mounting plate; two limiting plates are arranged on the outer baffle of the drawer, and the two limiting plates are matched with the transmission plate to limit the transmission plate.

As a further improvement of the technology, two protective boxes which play a role in protecting the two groups of first connecting pieces are symmetrically arranged on the inner end surface of the drawer opening formed in the cabinet body.

As a further improvement of the technology, the upper end of the upper pressing block is provided with a first inclined surface, and the lower end surface of the trigger block is provided with a second inclined surface; each trigger block is matched with the first inclined surface on the corresponding upper pressing block through the second inclined surface on the trigger block.

As a further improvement of the technology, two second guide sliding grooves are symmetrically formed in two inner side faces of the U-shaped cabinet plate, two first guide sliding blocks are symmetrically arranged on two sides of the support, and the support is arranged on the U-shaped cabinet plate through the sliding fit of the two first guide sliding blocks and the two second guide sliding grooves.

As a further improvement of the technology, the drawer outer baffle is provided with two shaft holes, and the first rotating shaft is rotatably arranged in one of the shaft holes; the second rotating shaft is rotatably arranged in the other shaft hole.

An interlocking mechanism is arranged between the second switch handle and the first switch handle; when the first switch handle is adjustable, the second switch handle is locked; when the second switch handle is adjustable, the first switch handle is locked.

The interlocking mechanism comprises a third gear, a first toothed plate, a fourth gear, a first support and a limiting wheel, wherein the third gear is fixedly arranged on the first rotating shaft; the first toothed plate is slidably mounted on the side surface of the drawer outer baffle through a first support and is meshed with the third gear; the seventh rotating shaft is rotatably arranged on the outer baffle of the drawer, the fourth gear is fixedly arranged on the seventh rotating shaft, and the fourth gear is meshed with the first toothed plate; the limiting wheels are provided with arc-shaped notches, the two limiting wheels are fixedly installed on the second rotating shaft and the seventh rotating shaft respectively, and the two limiting wheels are always in contact fit with the outer circular surface of the other limiting wheel through the arc-shaped notches of one limiting wheel.

As a further improvement of the present technology, a sixth gear is fixedly mounted on the fourth rotating shaft, a fifth gear is fixedly mounted on the third rotating shaft, and the fifth gear is meshed with the sixth gear; the radius of the sixth gear is 2-4 times of the radius of the fifth gear.

As a further improvement of the technology, two first limiting grooves are formed in the drawer opening formed in the cabinet body from top to bottom, and a triangular clamping groove is formed in one end of each first limiting groove.

Install stop gear on the support, when the support is located drawer mouth inboard and the drawer outer baffle hugs closely the cabinet body front end face, stop gear is spacing with the slip of the cabinet body to the support phase, when breaking down, when high temperature or high-pressure gas generated, trigger adjustment mechanism and trigger, spacing shell destroys, the third pivot is driven rotatoryly under the effect of second spring, first connecting piece and the first disconnection of second connecting piece at this in-process, later stop gear removes the slip spacing to the support with the cabinet body, stop gear outwards slides along with the relative cabinet body of support.

The limiting mechanism comprises a seventh gear, limiting toothed plates, an eighth gear, a fifth rotating shaft and a third support, wherein the seventh gear is fixedly mounted on the fourth rotating shaft, one end of each limiting toothed plate is provided with a triangular limiting plate, the two limiting toothed plates are vertically and slidably mounted on the support through the third support, the two limiting toothed plates are respectively provided with teeth, and one of the two limiting toothed plates is meshed with the seventh gear; the eighth gear is rotatably mounted on the bracket through a fifth rotating shaft, and the two limiting toothed plates are positioned on two sides of the eighth gear and are both meshed with the eighth gear; the two limit toothed plates are respectively matched with two first limit grooves and two triangular clamping grooves formed in the drawer grooves.

Two side surfaces of the U-shaped cabinet plate are provided with avoidance sliding grooves for avoiding the two limiting toothed plates to slide.

As a further improvement of the technology, the six mounting plates are respectively and fixedly provided with a second guide sliding block, and the mounting plates are provided with two third guide sliding chutes which are positioned at the upper side and the lower side of the second guide sliding block.

A third guide sliding block is fixedly arranged on one side of each of the upper pressing block and the lower pressing block, and the upper pressing block and the lower pressing block are arranged on the corresponding mounting plates through the sliding fit of the third guide sliding blocks and the third guide sliding chutes; and the fourth toothed plate is provided with fourth guide sliding grooves which are uniformly distributed, and the fourth toothed plate is arranged on the six mounting plates through the sliding fit of the fourth guide sliding grooves and the second guide sliding blocks.

The upper pressing block and the lower pressing block are respectively and fixedly provided with a third toothed plate, the six tenth gears are respectively and rotatably arranged on the support through a sixth rotating shaft, and the six tenth gears are respectively meshed with the two corresponding third toothed plates.

As a further improvement of the technology, the limiting shell can be broken under high pressure or high temperature.

Compared with the traditional switch cabinet technology, the switch cabinet has the following beneficial effects:

1. the invention can control whether the first connecting piece and the second connecting piece are clamped or not and the locking state by directly pulling the first switch handle, compared with the traditional screw control, the locking and unlocking process of the invention is convenient and quick to operate, and the control of whether the first connecting piece and the second connecting piece are clamped or not is increased, thus being convenient for pulling out the drawer.

2. When the drawer unit breaks down and high-temperature or high-pressure gas is generated, the gas in the drawer unit can be smoothly discharged after the bracket moves out relative to the U-shaped cabinet plate, so that explosion is prevented. In the process of explosion, the trigger block which plays a role in clamping the first connecting piece and the second connecting piece can release the clamping effect on the first connecting piece and the second connecting piece by triggering the driving of the second spring in the adjusting mechanism, so that the first connecting piece and the second connecting piece cannot generate overlarge resistance in the process of pushing the support to move outwards by explosive gas.

3. When the first connecting piece and the second connecting piece are matched in a normal state, the limiting mechanism plays a role in limiting sliding of the support, namely, the limiting mechanism plays a role in protecting connection of the first connecting piece and the second connecting piece and prevents the first connecting piece and the second connecting piece from being separated; when a fault occurs and high-temperature or high-pressure gas is generated, the limiting mechanism relieves the limit of the bracket, namely relieves the limit of the second connecting piece, the second connecting piece can be separated relative to the first connecting piece, and meanwhile, in the state, the limiting mechanism plays a role in limiting the bracket after being ejected out for a certain stroke, so that the bracket is prevented from being ejected out suddenly to hurt workers and damage surrounding devices.

4. When internal faults generate high-pressure or high-temperature gas, the traditional switch cabinet can be completely drawn out, but the drawing is not smooth due to friction force generated by the gravity of an internal structure and clamping resistance of the first connecting piece and the second connecting piece.

5. According to the invention, the first connecting piece and the second connecting piece are not easy to loosen in the using process by applying pressure of the upper pressing block and the lower pressing block.

6. The arc-shaped notches of the two limiting wheels can achieve the effect of intrinsic safety that the drawer cannot be pulled out when being powered on and can be powered on after being installed and locked.

Drawings

Fig. 1 is an external view of an entire part.

Fig. 2 is a schematic view of the overall component distribution.

Fig. 3 is a schematic distribution diagram of the limiting toothed plate.

Fig. 4 is a cabinet structure schematic diagram.

Fig. 5 is a schematic view of a drawer unit structure.

Fig. 6 is a schematic structural diagram of a U-shaped cabinet plate.

Fig. 7 is a schematic view of the internal structure of the U-shaped cabinet plate.

Fig. 8 is a schematic view of a stent structure.

Figure 9 is a circuit breaker installation schematic.

Fig. 10 is a schematic structural view of the automatic switch adjustment mechanism.

Fig. 11 is a schematic view of the interlock mechanism.

Fig. 12 is a schematic view of the trigger adjustment mechanism.

Fig. 13 is a schematic structural view of the limiting mechanism.

Fig. 14 is a schematic view of the first and second connector arrangements.

FIG. 15 is a schematic view of the mating of the first connector and the second connector.

Fig. 16 is a schematic view of a second connector structure.

Fig. 17 is a tenth gear installation schematic.

Fig. 18 is a schematic view of a first connector structure.

Number designation in the figures: 1. a cabinet body; 2. a drawer unit; 3. a first connecting member; 4. a drawer opening; 5. a first limit groove; 6. a card slot; 7. a protective case; 8. fixing grooves; 10. an outer baffle of the drawer; 11. a U-shaped cabinet plate; 12. a circuit breaker; 13. a second guide chute; 14. avoiding the chute; 15. a rotating wheel; 16. an automatic switch adjusting mechanism; 17. an interlock mechanism; 18. triggering an adjusting mechanism; 19. a limiting mechanism; 20. a support; 21. a shaft hole; 22. a first guide slider; 23. mounting a plate; 24. a second guide slider; 25. a third guide chute; 26. mounting grooves; 27. a first switch handle; 28. a first gear; 29. a first rotating shaft; 30. a spring fixing plate; 31. a second gear; 32. a first spring; 33. a limiting plate; 34. connecting columns; 35. a drive plate; 36. a third gear; 37. a first toothed plate; 38. a fourth gear; 39. an arc-shaped notch; 40. a first support; 41. a second switch handle; 42. a second rotating shaft; 43. a tenth gear; 44. a U-shaped drive plate; 45. a switch plate; 46. a limiting wheel; 47. a seventh rotating shaft; 48. a fifth gear; 49. a sixth gear; 50. a third rotating shaft; 51. a fourth rotating shaft; 52. a connecting plate; 53. a limiting clamping plate; 54. an arcuate shell; 55. a limiting shell; 56. a second spring; 57. an arc-shaped sliding block; 58. an arc-shaped slide bar; 59. a seventh gear; 60. a triangular limit plate; 62. a limit toothed plate; 63. an eighth gear; 64. a fifth rotating shaft; 65. a third support; 67. a fourth toothed plate; 68. a ninth gear; 69. pressing the block; 70. a third toothed plate; 71. a first inclined plane; 72. a second connecting member; 73. a third guide slider; 74. a trigger block; 75. a second inclined plane; 76. a first electrical connection post; 77. a groove; 78. a sixth rotating shaft; 80. a second electrical connection post; 81. a protrusion; 82. pressing the blocks; 83. and a fourth guide chute.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples or figures are illustrative of the present invention and are not intended to limit the scope of the present invention.

As shown in fig. 1, the intelligent cabinet comprises a cabinet body 1, a drawer unit 2, a circuit breaker 12, a fuse, a current transformer, an ammeter and an indicator light, wherein as shown in fig. 4, the cabinet body 1 is divided into a front part and a rear part which are separated by a partition plate, the front end of the cabinet body 1 is provided with a plurality of drawer openings 4 which are uniformly distributed, the partition plate is provided with two groups of fixing grooves 8 which are symmetrically distributed, and the three fixing grooves 8 in each group are uniformly distributed on the partition plate; as shown in fig. 1 and 2, a plurality of drawer units 2 are slidably mounted in the drawer openings 4 in a one-to-one correspondence. The front end area of the partition board in the cabinet body 1 is a mounting and pulling-out area of the drawer unit 2, and the rear area of the partition board is mainly used for mounting arrangement of connection lines of the first connecting piece 3 and other components. Each drawer unit 2 corresponds to a group of outlet loops.

All electrical components in the conventional switch cabinet in the drawer unit 2 of the present invention are prior art and are basically mounted on the U-shaped cabinet plate 11.

As shown in fig. 2, a first connecting member 3 is fixedly installed in each of the fixing grooves 8; as shown in fig. 18, one end of the first connector 3 has a second electrical connection post 80, and the other end of the first connector 3 has vertically symmetrical and laterally distributed protrusions 81.

The second electrical connection post 80 of the first connector 3 of the present invention is adapted to be wired to other input and output components.

After the first connecting member 3 and the second connecting member 72 are engaged, the engagement of the protrusion 81 on the first connecting member 3 and the groove 77 of the second connecting member 72 provides a certain clamping effect for the engagement of the two.

As shown in fig. 5, the drawer unit 2 includes a drawer outer baffle 10, a U-shaped cabinet plate 11, a circuit breaker 12, a trigger adjusting mechanism 18, and a bracket 20, wherein as shown in fig. 6, four rotating wheels 15 are rotatably mounted at four corners of the lower side of the U-shaped cabinet plate 11, and the U-shaped cabinet plate 11 is slidably mounted in the corresponding drawer opening 4 through the four rotating wheels 15; as shown in fig. 5, the bracket 20 is slidably mounted on the U-shaped cabinet plate 11, the drawer outer baffle 10 is fixedly mounted on the bracket 20 and located at the front side of the cabinet body 1, as shown in fig. 8, six uniformly distributed mounting plates 23 are mounted at one end of the bracket 20 away from the drawer outer baffle 10, and each mounting plate 23 is provided with a mounting groove 26; as shown in fig. 16, one end of the second connecting member 72 is a fork-shaped structure, and a plurality of grooves 77 are symmetrically formed on two inner end surfaces of the fork-shaped structure, and the other end of the second connecting member 72 has a first electrical connection column 76; as shown in fig. 7, 9 and 14, six second connecting members 72 are fixedly mounted on the bracket 20 through six mounting grooves 26; six second connecting pieces 72 are correspondingly matched with six first connecting pieces 3 one by one, and after the first connecting pieces 3 are matched with the second connecting pieces 72, the bulges 81 on the first connecting pieces 3 are in clamping fit with the grooves 77 on the second connecting pieces 72.

The function of the runner 15 is to reduce the resistance when the drawer unit 2 is pulled out.

The U-shaped cabinet 11 of the present invention is composed of a bottom plate as the bottom plate of the drawer unit 2 and two side plates for providing the mounting and sliding support for the rack 20. The circuit breaker 12 and other electrical components are mounted on the upper side of the bottom plate of the U-shaped cabinet plate 11, and when the bracket 20 is pulled out relative to the U-shaped cabinet plate 11, the U-shaped cabinet plate 11 has a certain movement resistance under the action of the gravity of the circuit breaker 12 and other electrical components.

The first electrical connection post 76 on the second connector 72 serves for connection to component lines for input and output within the drawer unit 2.

As shown in fig. 15, an upper pressing block 82 and a lower pressing block 69 are mounted on the upper side and the lower side of each second connecting piece 72, and as shown in fig. 17, the upper pressing block 82 and the lower pressing block 69 are synchronously connected through a toothed plate and a gear transmission; as shown in fig. 14, the fourth toothed plate 67 is transversely slidably mounted at the rear side of the bracket 20, six trigger blocks 74 are uniformly and fixedly mounted at the lower side of the fourth toothed plate 67, and the six trigger blocks 74 are in inclined plane fit with the six upper pressing blocks 82.

According to the invention, the six trigger blocks 74 can be driven to transversely slide by controlling the sliding of the fourth toothed plate 67, when the six trigger blocks 74 transversely slide towards one side corresponding to the upper pressing block 82, the trigger slide blocks under the matching of the second inclined surfaces 75 on the trigger blocks and the first inclined surfaces 71 on the upper pressing block 82 can extrude the upper pressing block 82, so that the upper pressing block 82 moves downwards, the lower pressing block 69 moves upwards through the transmission of the two third toothed plates 70 and the tenth gear 43, the upper pressing block 82 and the lower pressing block 69 move towards the middle, and finally the first connecting piece 3 is clamped, and a certain clamping force is provided for the first connecting piece 3 and the second connecting piece 72 after the matching through the fourth toothed plate 67, the trigger blocks 74, the upper pressing block 82 and the lower pressing block 69, so that the stability of the first connecting piece 3 and the second connecting piece 72 is ensured, and the phenomenon of looseness in long-time use is prevented.

As shown in fig. 7 and 9, the first rotating shaft 29 is rotatably mounted on the bracket 20, and one end of the first rotating shaft 29 passes through the drawer outer baffle 10 and is fixedly mounted with a first switch handle 27; as shown in fig. 12, the fourth rotating shaft 51 is rotatably mounted on the bracket 20, and one end of the fourth rotating shaft 51 is in transmission connection with the other end of the first rotating shaft 29 through the trigger adjusting mechanism 18; the third rotating shaft 50 is rotatably mounted on the bracket 20, and one end of the third rotating shaft 50 is in transmission connection with the other end of the fourth rotating shaft 51 through two gears with different radiuses; a ninth gear 68 is fixedly installed at the other end of the third rotating shaft 50, and the ninth gear 68 is engaged with the fourth tooth plate 67. In the invention, when the first switch handle 27 is pulled, the first switch handle 27 drives the first rotating shaft 29 to rotate, the first rotating shaft 29 rotates to drive the trigger adjusting mechanism 18 to drive the fourth rotating shaft 51 to rotate, the fourth rotating shaft 51 rotates to drive the third rotating shaft 50 to rotate through gear transmission, the third rotating shaft 50 rotates to drive the ninth gear 68 to rotate, the ninth gear 68 rotates to drive the fourth toothed plate 67 to transversely slide, and further whether the upper pressing block 82 and the lower pressing block 69 clamp the second connecting piece 72 or not is controlled.

As shown in fig. 12, the trigger adjustment mechanism 18 includes a limit catch plate 53, an arc-shaped shell 54, a limit shell 55, a second spring 56, an arc-shaped slider 57, and an arc-shaped slide bar 58, wherein the arc-shaped shell 54 is fixedly mounted on the fourth rotating shaft 51, the arc-shaped slide bar 58 is slidably mounted on the arc-shaped shell 54, and one end of the arc-shaped slide bar 58 is connected to the first rotating shaft 29 through a connecting plate 52; an arc-shaped sliding block 57 is fixedly installed on the arc-shaped sliding strip 58, the arc-shaped sliding block 57 is positioned in the arc-shaped shell 54, and a pre-pressed second spring 56 is installed between the arc-shaped sliding block 57 and the inner end face of the arc-shaped shell 54; the other end of the arc-shaped sliding strip 58 is fixedly provided with a limiting clamping plate 53, a limiting shell 55 is arranged between the limiting clamping plate 53 and the arc-shaped shell 54, and the second spring 56 is pre-pressed under the action of the limiting shell 55.

When the first rotating shaft 29 rotates clockwise, the first rotating shaft 29 drives the arc-shaped sliding strip 58 to rotate clockwise through the connecting plate 52, the arc-shaped sliding strip 58 rotates clockwise through the arc-shaped sliding block 57 and the driving belt of the second spring 56, and the arc-shaped shell 54 drives the fourth rotating shaft 51 to rotate clockwise; when the first rotating shaft 29 rotates counterclockwise, the first rotating shaft 29 drives the arc-shaped sliding strip 58 to rotate clockwise through the connecting plate 52, the arc-shaped sliding strip 58 rotates counterclockwise through the driving belt of the limiting clamping plate 53 and the limiting shell 55, and the arc-shaped shell 54 drives the fourth rotating shaft 51 to rotate counterclockwise.

As shown in fig. 11, the circuit breaker 12 is installed at an upper side of the U-shaped cabinet panel 11; the second rotating shaft 42 is rotatably installed on the drawer outer baffle 10, and the second switch handle 41 is installed on the drawer outer baffle 10 and fixed with the second rotating shaft 42; the other end of the second rotating shaft 42 is fixedly provided with a U-shaped driving plate 44, the circuit breaker 12 is provided with a switch plate 45 for controlling the switch, and the U-shaped driving plate 44 is clamped on the switch plate 45.

As shown in fig. 9, the automatic switch adjusting mechanism 16 is mounted on the first rotating shaft 29 near the drawer outer panel 10.

As shown in fig. 10, the automatic switch adjusting mechanism 16 includes a first gear 28, a spring fixing plate 30, a second gear 31, a first spring 32, a limiting plate 33, a connecting column 34, and a transmission plate 35, wherein the first gear 28 is fixedly installed on the first rotating shaft 29, the second gear 31 is rotatably installed on the drawer outer panel 10, and the second gear 31 is engaged with the first gear 28; the spring fixing plate 30 is fixedly arranged on the drawer outer baffle plate 10; a transmission plate 35 is fixedly arranged on the second gear 31, and the connecting column 34 is rotatably arranged on the transmission plate 35; a pre-tensioned first spring 32 is arranged between the connecting column 34 and the spring mounting plate 23; two limiting plates 33 are arranged on the outer baffle 10 of the drawer, and the two limiting plates 33 are matched with the transmission plate 35 to limit the transmission plate 35.

According to the invention, when the first switch handle 27 is pulled, the first rotating shaft 29 is driven to rotate, the first rotating shaft 29 drives the first gear 28 to rotate, the first gear 28 drives the second gear 31 to rotate, the second gear 31 drives the transmission plate 35 to rotate, the transmission plate 35 is provided with the pre-tensioned first spring 32 between the connecting column 34 and the spring fixing plate 30, after the transmission plate 35 rotates to enable the first spring 32 and the transmission plate 35 to form a straight line, the stretched amount of the first spring 32 is maximum, and no matter which side the transmission plate 35 is biased, under the action of the tension of the first spring 32, the transmission plate 35 can rapidly and automatically swing to be matched with the limiting plate 33 on the side and is limited by the limiting plate 33, namely, after the first switch handle 27 is pulled for a certain angle, the first switch handle 27 can automatically swing to the side to be pulled, and under the action of the tension of the first spring 32, the first switch handle 27 has a certain reverse pulling resistance after being pulled in place, so that the stability of the first switch handle 27 is ensured.

As shown in fig. 4, two protection boxes 7 for protecting two groups of first connecting members 3 are symmetrically installed on the inner end surface of the drawer opening 4 formed in the cabinet 1.

As shown in fig. 15, the upper end of the upper pressing block 82 has a first inclined surface 71, and the lower end surface of the trigger block 74 has a second inclined surface 75; each trigger block 74 cooperates with a second ramp 75 thereon with a first ramp 71 on a corresponding upper press block 82.

As shown in fig. 6, two second guiding sliding grooves 13 are symmetrically formed on two inner side surfaces of the U-shaped cabinet plate 11, as shown in fig. 8, two first guiding sliding blocks 22 are symmetrically installed on two sides of the bracket 20, and as shown in fig. 5, the bracket 20 is installed on the U-shaped cabinet plate 11 through sliding fit of the two first guiding sliding blocks 22 and the two second guiding sliding grooves 13.

As shown in fig. 6, two shaft holes 21 are formed on the drawer outer baffle 10, and a first rotating shaft 29 is rotatably installed in one of the shaft holes 21; the second rotating shaft 42 is rotatably installed in the other shaft hole 21.

As shown in fig. 9, an interlock mechanism 17 is installed between the second switch handle 41 and the first switch handle 27; when the first switch handle 27 is adjustable, the second switch handle 41 is locked; when the second switch handle is adjustable, the first switch handle 27 is locked.

As shown in fig. 11, the interlocking mechanism 17 includes a third gear 36, a first toothed plate 37, a fourth gear 38, a first support 40, and a limiting wheel 46, wherein the third gear 36 is fixedly mounted on the first rotating shaft 29; the first toothed plate 37 is slidably mounted on the side of the drawer outer barrier 10 through a first support 40, and the first toothed plate 37 is engaged with the third gear 36; the seventh rotating shaft 47 is rotatably installed on the drawer outer baffle 10, the fourth gear 38 is fixedly installed on the seventh rotating shaft 47, and the fourth gear 38 is engaged with the first toothed plate 37; the limiting wheels 46 are provided with arc notches 39, the two limiting wheels 46 are respectively and fixedly installed on the second rotating shaft 42 and the seventh rotating shaft 47, and the two limiting wheels 46 are always provided with the arc notches 39 of one limiting wheel 46 to be in contact fit with the outer circular surface of the other limiting wheel 46.

The interlock mechanism 17 functions to ensure that the drawer unit 2 cannot be pulled out in the open state of the circuit breaker 12, and if once pulled out, an arc is formed at the connection of the first connector 3 and the second connector 72, causing a fire.

According to the invention, when the arc notch 39 on one of the two limiting wheels 46 is matched with the circular surfaces of the two limiting wheels 46, the other limiting wheel 46 limits the limiting wheel 46 through the arc notch 39, the limiting wheel 46 cannot rotate, if the limiting wheel 46 mounted on the second rotating shaft 42 is limited, the second rotating shaft 42 is in a limited state, namely the second switch handle 41 cannot be pulled, the first switch handle 27 can be pulled, the first switch handle 27 is pulled to drive the first rotating shaft 29 to rotate, the first rotating shaft 29 rotates to drive the third gear 36 to rotate, the third gear 36 rotates to drive the first toothed plate 37 to slide, the first toothed plate 37 slides to drive the fourth gear 38 to rotate, the fourth gear 38 rotates to drive the seventh rotating shaft 47 to rotate, and the seventh rotating shaft 47 rotates to drive the corresponding limiting wheel 46 to rotate; when the limit wheel 46 installed on the seventh rotation shaft 47 is limited, the first switch handle 27 is locked through the transmission of the seventh rotation shaft 47, the fourth gear 38, the first tooth plate 37, the third gear 36 and the first rotation shaft 29, and the second switch handle 41 can rotate, thereby controlling the switch of the circuit breaker 12.

As shown in fig. 12, the sixth gear 49 is fixedly mounted on the fourth rotating shaft 51, the fifth gear 48 is fixedly mounted on the third rotating shaft 50, and the fifth gear 48 is meshed with the sixth gear 49; the radius of the sixth gear 49 is 2-4 times the radius of the fifth gear 48. The transmission amplification of the fifth gear 48 and the sixth gear 49 can ensure that the sliding stroke of the fourth toothed plate 67 can enable the trigger block 74 to release the clamping action on the first connecting piece 3 and the second connecting piece 72 when the first switch handle 27 is pulled ninety degrees.

As shown in fig. 4, two first limiting grooves 5 are formed in the drawer opening 4 formed in the cabinet body 1, and a triangular clamping groove 6 is formed at one end of each first limiting groove 5.

As shown in fig. 7 and 9, the limiting mechanism 19 is mounted on the bracket 20, when the bracket 20 is located inside the drawer opening 4 and the drawer outer baffle 10 is tightly attached to the front end surface of the cabinet 1, the limiting mechanism 19 limits the sliding of the bracket 20 and the cabinet 1, when a fault occurs and high-temperature or high-pressure gas is generated, the adjusting mechanism 18 is triggered to trigger, the limiting shell 55 is damaged, the third rotating shaft 50 is driven to rotate under the action of the second spring 56, in the process, the first connecting piece 3 and the second connecting piece 72 are firstly disconnected, then the limiting mechanism 19 releases the sliding limit of the bracket 20 and the cabinet 1, and the limiting mechanism 19 slides outwards relative to the cabinet 1 along with the bracket 20.

As shown in fig. 13, the limiting mechanism 19 includes a seventh gear 59, a limiting toothed plate 62, an eighth gear 63, a fifth rotating shaft 64, and a third support 65, wherein the seventh gear 59 is fixedly mounted on the fourth rotating shaft 51, one end of the limiting toothed plate 62 is provided with a triangular limiting plate 60, the two limiting toothed plates 62 are slidably mounted on the bracket 20 up and down through the third support 65, the two limiting toothed plates 62 are provided with teeth, and one of the two limiting toothed plates 62 is engaged with the seventh gear 59; the eighth gear 63 is rotatably mounted on the bracket 20 through a fifth rotating shaft 64, and the two limit toothed plates 62 are located at two sides of the eighth gear 63 and are both meshed with the eighth gear 63; as shown in fig. 3, the two limit tooth plates 62 are respectively matched with the two first limit grooves 5 and the two triangular clamping grooves 6 formed in the drawer groove.

As shown in fig. 6, the two side surfaces of the U-shaped cabinet plate 11 are provided with the avoidance sliding grooves 14 for avoiding the two limit toothed plates 62 to slide.

The limiting mechanism 19 designed by the invention has the function that when the first connecting piece 3 is matched with the second connecting piece 72 in a normal state, the limiting mechanism 19 plays a role in limiting sliding of the bracket 20, namely, plays a role in protecting the connection of the first connecting piece 3 and the second connecting piece 72 and prevents the first connecting piece 3 and the second connecting piece 72 from being separated.

When a fault occurs and high-temperature or high-pressure gas is generated, the fourth rotating shaft 51 rotates under the action of the second spring 56, the fourth rotating shaft 51 rotates to drive the sixth gear 49 to rotate, the sixth gear 49 rotates to drive the fifth gear 48 to rotate, the fifth gear 48 rotates to drive the third rotating shaft 50 to rotate, the third rotating shaft 50 rotates to drive the seventh gear 59, the seventh gear 59 rotates to drive the corresponding limit toothed plate 62 to move transversely, the limit toothed plate 62 moves to drive the eighth gear 63 to rotate, the eighth gear 63 rotates to drive the other limit toothed plate 62 to move transversely, meanwhile, the clamping force of the upper pressing block 82 and the lower pressing block 69 on the first connecting piece 3 and the second connecting piece 72 is gradually reduced, after the two limit toothed plates 62 are completely separated from the two clamping slots 6, the clamping force between the first connecting piece 3 and the second connecting piece 72 is also reduced, the drawer unit 2 has no internal baffle, and under the action of the high-temperature or high-pressure gas, the outer baffle 10 of drawer can only move outward, and two limiting plates 33 are driven by support 20 and slide in two first limiting grooves 5, and first connecting piece 3 and second connecting piece 72 throw off under high temperature or high-pressure gas's effort simultaneously, and the clamp force between first connecting piece 3 and the second connecting piece 72 also diminishes during consequently, so explosive gas promotes the in-process that support 20 moved outward, and first connecting piece 3 and second connecting piece 72 can not produce too big resistance.

The triangular limiting plate 60 on the toothed plate has the effect of centering the bracket 20 through the matching of the triangular limiting plates 60 on the two sides and the triangular clamping grooves 6 in the process of limiting the bracket 20.

As shown in fig. 8, a second guide slider 24 is fixedly mounted on each of the six mounting plates 23, and two third guide sliding grooves 25 are formed in the mounting plates 23 at upper and lower sides of the second guide slider 24.

As shown in fig. 15, a third guide slider 73 is fixedly mounted on one side of each of the upper pressing block 82 and the lower pressing block 69, and the upper pressing block 82 and the lower pressing block 69 are mounted on the corresponding mounting plate 23 through the sliding fit of the third guide slider 73 and the third guide sliding groove 25; the fourth toothed plate 67 is provided with fourth guide sliding grooves 83 which are uniformly distributed, and the fourth toothed plate 67 is mounted on the six mounting plates 23 through the sliding fit of the fourth guide sliding grooves 83 and the second guide sliding blocks 24.

As shown in fig. 17, a third toothed plate 70 is fixedly mounted on each of the upper pressing block 82 and the lower pressing block 69, six tenth gears 43 are rotatably mounted on the bracket 20 through a sixth rotating shaft 78, and the six tenth gears 43 are respectively engaged with the two corresponding third toothed plates 70.

The limiting shell 55 can be broken at high pressure or high temperature, and is made of a specific material by adopting the existing product or the existing technology. When high-temperature or high-pressure gas is generated due to a fault, the limiting shell 55 can be broken, the second spring 56 triggers the third rotating shaft 50 to rotate, the limiting mechanism 19 releases the limiting on the support 20, the triggering block 74 releases the clamping on the first connecting piece 3 and the second connecting piece 72, and the first connecting piece 3 and the second connecting piece 72 can be smoothly separated.

The invention can control whether the first connecting piece 3 and the second connecting piece 72 are clamped or not and the locking state by directly pulling the first switch handle 27, compared with the traditional screw control, the locking and unlocking process of the invention has convenient and quick operation, and the control of whether the first connecting piece 3 and the second connecting piece 72 are clamped or not is increased, thus being convenient for pulling out the drawer.

The specific working process is as follows: when the switch cabinet designed by the invention is used, in the normal use process, when the drawer unit 2 needs to be dismounted, the second switch handle 41 is firstly pulled, so that the second switch handle 41 closes the circuit breaker 12 through the second rotating shaft 42, and the arc-shaped notch 39 of the limiting wheel 46 arranged on the second rotating shaft 42 is matched with the outer circular surface of the limiting wheel 46 arranged on the seventh rotating shaft 47, the locking of the first switch handle 27 is released, then the first switch handle 27 is manually pulled, the first switch handle 27 drives the first rotating shaft 29 to rotate, the first rotating shaft 29 drives the fourth rotating shaft 51 to rotate through the trigger adjusting mechanism 18, the fourth rotating shaft 51 drives the sixth gear 49 to rotate, the sixth gear 49 rotates to drive the fifth gear 48 to rotate, the fifth gear 48 rotates to drive the third rotating shaft 50 to rotate, the third rotating shaft 50 rotates to drive the seventh gear 59, the seventh gear 59 rotates to drive the corresponding limiting toothed plate 62 to transversely slide, the limiting toothed plates 62 slide to drive the eighth gear 63 to rotate, the eighth gear 63 rotates to drive the other limiting toothed plate 62 to transversely move, when the triangular limiting plates 60 of the two limiting toothed plates 62 are separated from the two clamping grooves 6 and are not matched with the first limiting groove 5, the limitation on the bracket 20, namely the second connecting piece 72 is removed, meanwhile, the third rotating shaft 50 rotates to drive the ninth gear 68 to rotate, the ninth gear 68 rotates to drive the fourth toothed plate 67 to transversely slide, the fourth toothed plate 67 moves to drive the trigger block 74 thereon to move, and the extrusion on the upper press block 82 is removed, so that the first connecting piece 3 is easily separated from the second connecting piece 72; at this time, the drawer unit 2 can be pulled out manually.

When the drawer unit 2 needs to be installed, the drawer unit 2 is firstly manually placed into the drawer opening 4, the second connecting piece 72 can be inserted into the first connecting piece 3 with small resistance under the control of the first switch handle 27, and the first connecting piece 3 can be wrapped up by the second connecting piece 72 after the drawer unit is placed into the drawer opening 4; then, when the circuit breaker 12 controlled by the second switch handle 41 is in an off state, the first switch handle 27 is manually pulled, the first switch handle 27 drives the first rotating shaft 29 to rotate, the first rotating shaft 29 drives the fourth rotating shaft 51 to rotate through the trigger adjusting mechanism 18, the fourth rotating shaft 51 drives the sixth gear 49 to rotate, the sixth gear 49 drives the fifth gear 48 to rotate, the fifth gear 48 drives the third rotating shaft 50 to rotate, the third rotating shaft 50 drives the seventh gear 59 to rotate, the seventh gear 59 drives the corresponding limit toothed plate 62 to transversely slide, the limit toothed plate 62 drives the eighth gear 63 to rotate, the eighth gear 63 drives the other limit toothed plate 62 to transversely move, so as to limit the sliding of the bracket 20, i.e. the second connecting piece 72, meanwhile, the third rotating shaft 50 drives the ninth gear 68 to rotate, the ninth gear 68 drives the fourth toothed plate 67 to transversely slide, the fourth toothed plate 67 moves to drive the trigger blocks 74 thereon to move, when six trigger blocks 74 transversely slide towards one side of the corresponding upper pressing block 82, the trigger sliding blocks under the matching of the second inclined surfaces 75 on the trigger sliding blocks and the first inclined surfaces 71 on the upper pressing block 82 can extrude the upper pressing block 82, so that the upper pressing block 82 moves downwards, the upper pressing block 82 moves downwards to enable the lower pressing block 69 to move upwards through the transmission of the two third toothed plates 70 and the tenth gear 43, the upper pressing block 82 and the lower pressing block 69 move towards the middle to finally clamp the first connecting piece 3, and a certain clamping force is provided for the first connecting piece 3 and the second connecting piece 72 after matching through the fourth toothed plate 67, the trigger blocks 74, the upper pressing block 82 and the lower pressing block 69, so that the stability of the first connecting piece 3 and the second connecting piece 72 is ensured. Finally, after the first switch handle 27 is locked, the second switch handle 41 is manually rotated, so that the arc notch 39 on the limiting wheel 46 mounted on the seventh rotating shaft 47 is matched with the outer circular surface of the limiting wheel 46 mounted on the second rotating shaft 42, the limiting wheel 46 mounted on the second rotating shaft 42 locks the first switch handle 27, and simultaneously, the second switch handle 41 is rotated to open the switch of the circuit breaker 12.

When a fault occurs and high-temperature or high-pressure gas is generated, the fragile limiting shell 55 is broken, and because the first rotating shaft 29 is static at this time, the arc-shaped shell 54 rotates towards one side where the limiting shell 55 is originally installed relative to the arc-shaped sliding strip 58 under the action of the pre-pressed second spring 56, and the arc-shaped shell 54 rotates to drive the fourth rotating shaft 51 to rotate; the fourth rotating shaft 51 rotates to drive the sixth gear 49 to rotate, the sixth gear 49 rotates to drive the fifth gear 48 to rotate, the fifth gear 48 rotates to drive the third rotating shaft 50 to rotate, the third rotating shaft 50 rotates to drive the seventh gear 59, the seventh gear 59 rotates to drive the corresponding limit toothed plate 62 to slide transversely, the limit toothed plate 62 slides to drive the eighth gear 63 to rotate, the eighth gear 63 rotates to drive the other limit toothed plate 62 to move transversely, the upper triangular limit plates 60 of the two limit toothed plates 62 are completely separated from the two clamping grooves 6 and are matched with the first limit groove 5, meanwhile, the clamping force of the upper pressing block 82 and the lower pressing block 69 on the first connecting piece 3 and the second connecting piece 72 is gradually reduced, the clamping force between the first connecting piece 3 and the second connecting piece 72 is also reduced, and because the drawer unit 2 has no internal baffle, at this time, under the action of high temperature or high pressure gas, the drawer outer baffle 10 can only move outwards, the two limit plates 33 are driven by the bracket 20 to slide in the two first limit grooves 5, and simultaneously, the gas pushes the first connecting piece 3 and the second connecting piece 72 to be separated, so that the trigger block 74 which plays a clamping role on the first connecting piece 3 and the second connecting piece 72 can release the clamping role on the first connecting piece 3 and the second connecting piece, and therefore, in the process that the explosive gas pushes the bracket 20 to move outwards, the first connecting piece 3 and the second connecting piece 72 cannot generate overlarge resistance.

Claims

1. The utility model provides an mls low pressure pull-out type cubical switchboard, it includes the cabinet body, drawer unit, circuit breaker, fuse, current transformer, ampere meter, pilot lamp, its characterized in that: the cabinet body is divided into a front part and a rear part which are separated by a partition plate, the front end of the cabinet body is provided with a plurality of uniformly distributed drawer openings, the partition plate is provided with two groups of symmetrically distributed fixed grooves, and three fixed grooves in each group are uniformly distributed on the partition plate; the plurality of drawer units are slidably arranged in the drawer openings in a one-to-one correspondence manner;

a first connecting piece is fixedly arranged in each fixing groove; one end of the first connecting piece is provided with a second electric connecting column, and the other end of the first connecting piece is provided with bulges which are symmetrically distributed transversely up and down;

the drawer unit comprises a drawer outer baffle, a U-shaped cabinet plate, a trigger adjusting mechanism and a bracket, wherein four corners of the lower side of the U-shaped cabinet plate are rotatably provided with four rotating wheels, and the U-shaped cabinet plate is slidably arranged in the corresponding drawer openings through the four rotating wheels; the support is slidably mounted on the U-shaped cabinet plate, the drawer outer baffle is fixedly mounted on the support and positioned on the front side of the cabinet body, six uniformly distributed mounting plates are mounted at one end of the support, which is far away from the drawer outer baffle, and each mounting plate is provided with a mounting groove; one end of the second connecting piece is of a fork-shaped structure, a plurality of grooves are symmetrically formed in two inner end faces of the fork-shaped structure, and the other end of the second connecting piece is provided with a first electric connecting column; the six second connecting pieces are fixedly arranged on the bracket through six mounting grooves; the six second connecting pieces are correspondingly matched with the six first connecting pieces one by one, and after the first connecting pieces are matched with the second connecting pieces, the bulges on the first connecting pieces are clamped and matched with the grooves on the second connecting pieces;

an upper pressing block and a lower pressing block are arranged on the upper side and the lower side of each second connecting piece, and the upper pressing block and the lower pressing block are in transmission synchronous connection through a toothed plate and a gear; the fourth toothed plate is transversely installed on the rear side of the support in a sliding manner, six trigger blocks are uniformly and fixedly installed on the lower side of the fourth toothed plate, and the six trigger blocks are matched with the six upper press block inclined planes;

the first rotating shaft is rotatably arranged on the bracket, and one end of the first rotating shaft penetrates through the outer baffle of the drawer and is fixedly provided with a first switch handle; the fourth rotating shaft is rotatably arranged on the bracket, and one end of the fourth rotating shaft is in transmission connection with the other end of the first rotating shaft through the trigger adjusting mechanism; the third rotating shaft is rotatably arranged on the bracket, and one end of the third rotating shaft is in transmission connection with the other end of the fourth rotating shaft through two gears with different radiuses; the ninth gear is fixedly arranged at the other end of the third rotating shaft and is meshed with the fourth toothed plate;

the trigger adjusting mechanism comprises a limiting clamping plate, an arc-shaped shell, a limiting shell, a second spring, an arc-shaped sliding block and an arc-shaped sliding strip, wherein the arc-shaped shell is fixedly arranged on the fourth rotating shaft, the arc-shaped sliding strip is slidably arranged on the arc-shaped shell, and one end of the arc-shaped sliding strip is connected with the first rotating shaft through a connecting plate; an arc-shaped sliding block is fixedly arranged on the arc-shaped sliding strip, the arc-shaped sliding block is positioned in the arc-shaped shell, and a pre-pressed second spring is arranged between the arc-shaped sliding block and the inner end face of the arc-shaped shell; the other end of the arc-shaped sliding strip is fixedly provided with a limiting clamping plate, a limiting shell is arranged between the limiting clamping plate and the arc-shaped shell, and a second spring is pre-pressed under the action of the limiting shell;

2. An mls low voltage draw out switchgear as claimed in claim 1 wherein: one side of the first rotating shaft, which is close to the outer baffle of the drawer, is provided with an automatic switch adjusting mechanism;

3. An mls low voltage draw out switchgear as claimed in claim 1 wherein: two protective boxes which play a role in protecting the two groups of first connecting pieces are symmetrically arranged on the inner end surface of the drawer opening formed in the cabinet body.

4. An mls low voltage draw out switchgear as claimed in claim 1 wherein: the upper end of the upper pressing block is provided with a first inclined plane, and the lower end surface of the trigger block is provided with a second inclined plane; each trigger block is matched with the first inclined surface on the corresponding upper pressing block through the second inclined surface on the trigger block.

5. An mls low voltage draw out switchgear as claimed in claim 1 wherein: two second guide sliding grooves are symmetrically formed in two inner side faces of the U-shaped cabinet plate, two first guide sliding blocks are symmetrically arranged on two sides of the support, and the support is arranged on the U-shaped cabinet plate through the sliding fit of the two first guide sliding blocks and the two second guide sliding grooves.

6. An mls low voltage draw out switchgear as claimed in claim 1 wherein: the outer baffle plate of the drawer is provided with two shaft holes, and the first rotating shaft is rotatably arranged in one of the shaft holes; the second rotating shaft is rotatably arranged in the other shaft hole;

an interlocking mechanism is arranged between the second switch handle and the first switch handle; when the first switch handle is adjustable, the second switch handle is locked; when the second switch handle is adjustable, the first switch handle is locked;

7. An mls low voltage draw out switchgear as claimed in claim 1 wherein: a sixth gear is fixedly arranged on the fourth rotating shaft, a fifth gear is fixedly arranged on the third rotating shaft, and the fifth gear is meshed with the sixth gear; the radius of the sixth gear is 2-4 times of the radius of the fifth gear.

8. An mls low voltage draw out switchgear as claimed in claim 1 wherein: two first limiting grooves are formed in the drawer opening formed in the cabinet body up and down, and a triangular clamping groove is formed in one end of each first limiting groove;

the limiting mechanism is arranged on the support, when the support is positioned on the inner side of the drawer opening and the outer baffle of the drawer is tightly attached to the front end face of the cabinet body, the limiting mechanism limits the sliding of the support phase and the cabinet body, when a fault occurs and high-temperature or high-pressure gas is generated, the adjusting mechanism is triggered, the limiting shell is damaged, the third rotating shaft is driven to rotate under the action of the second spring, the first connecting piece and the second connecting piece are disconnected firstly in the process, then the limiting mechanism relieves the sliding limit of the support and the cabinet body, and the limiting mechanism slides outwards relative to the cabinet body along with the support;

the limiting mechanism comprises a seventh gear, limiting toothed plates, an eighth gear, a fifth rotating shaft and a third support, wherein the seventh gear is fixedly mounted on the fourth rotating shaft, one end of each limiting toothed plate is provided with a triangular limiting plate, the two limiting toothed plates are vertically and slidably mounted on the support through the third support, the two limiting toothed plates are respectively provided with teeth, and one of the two limiting toothed plates is meshed with the seventh gear; the eighth gear is rotatably mounted on the bracket through a fifth rotating shaft, and the two limiting toothed plates are positioned on two sides of the eighth gear and are both meshed with the eighth gear; the two limit toothed plates are respectively matched with two first limit grooves and two triangular clamping grooves formed in the drawer grooves;

9. An mls low voltage draw out switchgear as claimed in claim 1 wherein: the six mounting plates are respectively and fixedly provided with a second guide sliding block, and two third guide sliding chutes are formed in the mounting plates and are positioned on the upper side and the lower side of the second guide sliding block;

a third guide sliding block is fixedly arranged on one side of each of the upper pressing block and the lower pressing block, and the upper pressing block and the lower pressing block are arranged on the corresponding mounting plates through the sliding fit of the third guide sliding blocks and the third guide sliding chutes; the fourth toothed plate is provided with fourth guide sliding chutes which are uniformly distributed, and the fourth toothed plate is arranged on the six mounting plates through the sliding fit of the fourth guide sliding chutes and the second guide sliding blocks;

10. An mls low voltage draw out switchgear as claimed in claim 1 wherein: the limiting shell can be broken under high pressure or high temperature.