CN108847605B

CN108847605B - Five-prevention interlocking device and handcart cabinet with same

Info

Publication number: CN108847605B
Application number: CN201811039264.2A
Authority: CN
Inventors: 金旭; 布庆春; 陈乐静; 陈孟列
Original assignee: Huayi Electric Apparatus Group
Current assignee: Huayi Electric Apparatus Group
Priority date: 2018-09-06
Filing date: 2018-09-06
Publication date: 2024-05-31
Anticipated expiration: 2038-09-06
Also published as: CN108847605A

Abstract

The invention discloses a five-prevention interlocking device and a handcart cabinet with the same, comprising a grounding switch operation shaft; the rear door interlocking mechanism prevents the rear door from being capable of operating the grounding switch operating shaft in an opened state; a front door interlock mechanism; an operation port for opening and closing an operation shaft capable of operating the ground switch; the handcart interlocking mechanism is connected with the circuit breaker handcart and the grounding switch operating shaft, so that the grounding switch operating shaft can be operated to switch on the grounding switch when the circuit breaker handcart is in a test position, and the circuit breaker handcart is locked when the grounding switch is switched on; according to the interlocking device, the grounding switch can be operated only when the circuit breaker chamber door, the cable chamber door and the rear door are closed, the grounding switch can be operated only when the circuit breaker handcart is in the test position, the grounding switch can be switched on by the grounding switch operating shaft, the circuit breaker handcart can be pulled out of the circuit breaker chamber, the circuit breaker handcart cannot be rocked to enter the working position after the grounding switch is switched on, the five-prevention requirement is met, and the interlocking device is safe and reliable.

Description

Five-prevention interlocking device and handcart cabinet with same

Technical Field

The invention relates to the technical field of handcart cabinets, in particular to a five-prevention interlocking device and a handcart cabinet.

Background

When the handcart cabinet is in fault or overhauled, in order to ensure personal safety, an operator can enter after the grounding switch is switched on, so that the interlocking of the grounding switch and the door in the high-voltage switch equipment is indispensable. In the operation process of the high-voltage handcart cabinet, five prevention needs to be achieved: 1. after a breaker in the switch cabinet is switched on at a test position, a breaker handcart cannot enter a working position; 2. when the grounding knife in the switch cabinet is in the closing position, the circuit breaker cannot be closed; 3. when a breaker in the switch cabinet works in a closing mode, the rear door of the cabinet is locked with the cabinet door by a machine on the grounding knife; 4. the vacuum circuit breaker in the switch cabinet is switched on when in work, and the earthing switch cannot be put into; 5. when the circuit breaker in the switch cabinet is in operation and is in closing operation, the circuit breaker cannot be withdrawn from the working position of the circuit breaker handcart.

Chinese patent document CN104025230B discloses a mechanical interlock between a cable room door, a rear door and a ground switch, comprising a rear door locking device for locking the rear door of an air insulation device; a rear axle relief member for providing space to the rear axle; the middle force transmission device is used for transmitting the acting force of closing the rear door to the unlocking pin; the unlocking pin control device is used for controlling the locking and unlocking of the unlocking pin; the rear door locking device comprises a rear door locking hook positioned on the rear outer shaft and a rear door locking groove positioned on the rear door, wherein the rear door locking hook and the rear door locking groove interact to lock the rear door.

The interlocking device can realize linkage of the cable chamber door and the rear door of the handcart cabinet, ensure that the cable chamber door and the rear door of the handcart cabinet cannot be opened when the grounding switch is disconnected, and further ensure that the grounding switch can be operated only when the cable chamber door and the rear door are closed; however, there is no interlocking device between the circuit breaker chamber door and the grounding switch and between the circuit breaker handcart and the grounding switch, so that the grounding switch can be operated even when the circuit breaker chamber door is opened, and the grounding switch can be operated to close when the circuit breaker is closed, so that the potential safety hazard is very high when the circuit breaker is used, maintained and overhauled, the electrified part is possibly touched to cause an accident, and the safety coefficient is low.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to overcome the defect that a grounding switch can be operated when a breaker chamber door is opened in the prior art, so that the five-prevention interlocking device which meets the five-prevention requirement is provided, and is safe and reliable.

Further, the invention provides a handcart cabinet with the five-prevention interlocking device.

A five-prevention interlocking device comprises

The grounding switch operating shaft can enable the grounding switch to be switched on and off through forward and reverse rotation;

The rear door interlocking mechanism drives the rear door to unlock or lock under the control of forward and reverse rotation of the grounding switch operating shaft, and can rotate the grounding switch operating shaft to close the grounding switch under the condition of limiting the locking state of the rear door;

the front door interlocking mechanism is connected with the breaker chamber door and the cable chamber door, and controls the opening and closing of an operation port for operating the grounding switch operation shaft through the opening and closing of the breaker chamber door and the cable chamber door;

the handcart interlocking mechanism is used for connecting the circuit breaker handcart with the grounding switch operating shaft, and controlling the operation of the grounding switch operating shaft and the handcart operating worm through positioning the position of the circuit breaker handcart, so that the circuit breaker handcart can be closed by the grounding switch only when being in a test position, and the circuit breaker handcart is locked.

The rear door interlocking mechanism comprises a locking structure which rotates along with the grounding switch operation shaft and can lock the rear door, and a first limiting structure which can move against the rear door and allows the grounding switch operation shaft to rotate.

The locking structure comprises a lock hook arranged at one end of the grounding switch operating shaft, close to the rear door, and a locking plate fixed at the rear door and suitable for hooking the lock hook.

The first limit structure comprises a support, wherein the support is arranged on the ground switch operation shaft and is close to the rear door, a first limit rod is fixed on the support in a penetrating mode, a second limit rod which can move on the first limit rod under the action of a first elastic biasing piece and the rear door and is provided with a limit groove in a forming mode is arranged on the ground switch operation shaft, and limit wheels which can be aligned with the limit groove when the rear door is closed and pass through the limit groove can be arranged on the ground switch operation shaft.

The front door interlocking mechanism comprises a first baffle plate which is arranged on the wall of the handcart cabinet and provided with an operation port for operating an earthing switch operation shaft, a second baffle plate which is matched with the first baffle plate to form an accommodating space, a sliding piece which is arranged in the accommodating space in a sliding way and can open or close the operation port, and a second limiting structure which can control the sliding of the sliding piece by positioning the states of the breaker chamber door and the cable chamber door; the sliding piece can slide when the breaker chamber door and the cable chamber door are closed, so that the operation opening is opened.

The second limiting structure comprises a third limiting structure capable of positioning the states of the breaker chamber door and the cable chamber door and a fourth limiting structure matched with the third limiting structure and limiting the sliding piece to slide.

The third limiting structure comprises through holes formed in the first baffle plate and opposite to the breaker chamber door and the cable chamber door respectively, an elastic block limited on the second baffle plate penetrates through the sliding piece to be connected with the through holes, and the elastic block retracts inwards or protrudes outwards relative to the through holes under the action of the front door and the second elastic biasing piece.

The fourth limiting structure comprises a limiting block which is formed on the side edge of the elastic block and connected with the sliding piece, and a rail which is formed on the side wall of the sliding piece and suitable for the limiting block to be inserted into and move in.

The handcart interlocking mechanism comprises a transmission structure which is connected with the grounding switch operation shaft and can transmit torque of the grounding switch operation shaft to the circuit breaker handcart, a locking structure which is connected with the transmission structure and can prevent the circuit breaker handcart from being pulled out of the circuit breaker chamber when the grounding switch is opened, a limiting structure which is linked with the locking structure and can prevent the circuit breaker handcart from being operated when the grounding switch is closed, and a positioning structure which can prevent the circuit breaker handcart from being closed when the grounding switch is not positioned at a test position.

The transmission structure comprises a rocker swinging along with the rotation of the grounding switch operation shaft, a knuckle arm rotating under the action of the rocker, a rotating rod fixedly connected with the knuckle arm and rotating along with the knuckle arm, and a transmission cam connected to the position of the rotating rod relative to the third locking plate.

The locking structure comprises a third locking plate which is in sliding connection with a handcart operation worm of the circuit breaker handcart and is arranged relative to a transmission cam of the transmission structure, a third locking hole which is formed in the side wall of the circuit breaker chamber and is in fit connection with the third locking plate, and a third resetting piece which is connected with the third locking plate and the side wall of the circuit breaker chamber, so that the third locking plate is inserted into the third locking hole.

The limiting structure comprises a limiting groove formed at the joint of the handcart operating worm and the third locking plate, a first operating hole formed in the third locking plate and allowing the handcart operating worm to rotate in the first operating hole, and a first limiting hole matched with the limiting groove when the third locking plate moves leftwards under the action of the transmission cam and limiting the rotation operation of the handcart operating worm.

The positioning structure comprises a positioning pin which can outwards protrude under the action of the circuit breaker handcart and inwards return under the action of a fourth reset piece, a second operation hole which is formed at the joint of the third locking plate and the positioning pin and allows the positioning pin to move in and out relative to the third locking plate, and a third operation hole which allows the third locking plate to move leftwards when the positioning pin is propped against the circuit breaker handcart and prevents the third locking plate from moving leftwards when the positioning pin is not connected with the circuit breaker handcart.

And a blocking structure capable of preventing the grounding switch from being closed when the circuit breaker handcart does not reach the test position is arranged between the transmission cam and the sliding part of the transmission structure.

The blocking structure comprises a blocking rod which is arranged on the transmission cam and can be connected with the upper wall of the sliding piece; the blocking rod limits the sliding of the sliding part under the cooperation of the third locking plate. The cable chamber locking structure comprises a rocker arm rotating along with the grounding switch operation shaft and a hook plate swinging along with the rocker arm and formed with a hook connected with a cross rod of the cable chamber door.

The invention also provides a handcart cabinet, which comprises the five-prevention interlocking device.

The technical scheme of the invention has the following advantages:

1. The five-prevention interlocking device comprises a grounding switch operating shaft and a rear door interlocking mechanism, wherein the rear door interlocking mechanism is used for locking a rear door and preventing the rear door from being capable of operating the grounding switch operating shaft in an open state; the front door interlocking mechanism is arranged between the breaker chamber door and the cable chamber door and is used for opening and closing an operation port capable of operating the grounding switch operation shaft, so that the grounding switch operation shaft can be operated only when the breaker chamber door and the cable chamber door are closed; the handcart interlocking mechanism is connected with the circuit breaker handcart and the grounding switch operating shaft, so that the grounding switch operating shaft can be operated to switch on the grounding switch when the circuit breaker handcart is in a test position, and the circuit breaker handcart is locked when the grounding switch is switched on; according to the interlocking device, the front door interlocking mechanism, the rear door interlocking mechanism and the handcart interlocking mechanism are respectively in linkage relation with the grounding switch operating shaft, so that the grounding switch can be operated only when the grounding switch operating shaft is in a closed state of the circuit breaker chamber door, the cable chamber door and the rear door, the grounding switch can be opened or closed, the grounding switch can be closed by the grounding switch operating shaft when the circuit breaker handcart is in a test position, the circuit breaker handcart can be pulled out of the circuit breaker chamber, the circuit breaker handcart cannot be rocked to enter the working position after the grounding switch is closed, the five-prevention requirement is met, and the safety performance of a handcart cabinet is greatly improved.

2. The invention provides a five-prevention interlocking device, wherein a rear door interlocking mechanism comprises a locking structure which rotates along with a grounding switch operation shaft and can lock a rear door, and a first limit structure which can move against the rear door and allows the grounding switch operation shaft to rotate; above-mentioned back door interlocking device makes back door and earthing switch operating shaft interlock, and when the back door was closed, earthing switch operating shaft just can rotate, realizes earthing switch closing a floodgate, when the back door was opened, can make the earthing switch operating shaft unable rotation, avoided carrying out the earthing switch brake-separating under the state that the back door was opened, improved the security performance of handcart cabinet.

3. The invention provides a five-prevention interlocking device, wherein a front door interlocking mechanism comprises a first baffle plate which is arranged on a cabinet wall of a handcart cabinet and provided with an operation port for operating a grounding switch operation shaft, a second baffle plate which is matched with the first baffle plate to form an accommodating space, a sliding part which is slidably arranged in the accommodating space and can open or close the operation port, and a second limiting structure which can control the sliding of the sliding part by positioning states of a breaker chamber door and a cable chamber door respectively; the sliding part can be slid when the breaker chamber door and the cable chamber door are closed, so that the operation port is opened; the front door interlocking device can realize the interlocking of the breaker chamber door, the cable chamber door and the grounding switch, ensure that the handcart cabinet can operate the grounding switch operating shaft only under the condition that the breaker chamber door and the cable chamber door are closed, switch on and switch off of the grounding switch are carried out, and if one of the breaker chamber door and the cable chamber door is not closed, the grounding switch operating shaft can not be operated, thereby effectively preventing misoperation, and being safe and reliable.

4. The invention provides a five-prevention interlocking device, wherein a handcart interlocking mechanism comprises a transmission structure which is connected with a grounding switch operation shaft and can transmit torque of the grounding switch operation shaft to a circuit breaker handcart, a locking structure which is connected with the transmission structure and can prevent the circuit breaker handcart from being pulled out of a circuit breaker chamber when the grounding switch is disconnected, a limiting structure which is linked with the locking structure and can prevent the circuit breaker handcart from being operated when the grounding switch is closed, and a positioning structure which can prevent the circuit breaker handcart from being closed when the grounding switch is not in a test position; the handcart interlocking mechanism is safe and reliable, through the cooperation between a plurality of structures, only the grounding switch operating shaft is guaranteed to be switched on to the grounding switch when the circuit breaker handcart is at a test position, and the circuit breaker handcart can be prevented from being pulled out of the circuit breaker chamber when the grounding switch is switched on by operating the handcart operating worm to push the circuit breaker handcart into a working position and prevent the grounding switch from being switched off.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a five-prevention interlocking mechanism provided by the invention in a front door opening state;

fig. 2 is a schematic structural view of the five-prevention interlocking mechanism provided by the invention in a front door closing state;

FIG. 3 is a schematic view of the rear door interlock mechanism shown in FIG. 2;

FIG. 4 is a schematic view of the front door interlock mechanism shown in FIG. 2;

FIG. 5 is a schematic view of another angle configuration of the front door interlock mechanism shown in FIG. 2;

FIG. 6 is a schematic view of the interlocking structure of the cart shown in FIG. 2;

FIG. 7 is a schematic illustration of the transmission structure shown in FIG. 6;

FIG. 8 is a schematic view of the locking structure, restraining structure and positioning structure shown in FIG. 6;

FIG. 9 is a schematic view of the drive cam of FIG. 6;

FIG. 10 is a schematic view of the structure of the locating pin shown in FIG. 6;

FIG. 11 is a schematic view of the third latch plate shown in FIG. 6;

FIG. 12 is a schematic view of the first latch plate shown in FIG. 6;

FIG. 13 is a schematic view of the second latch plate shown in FIG. 6;

FIG. 14 is a schematic view of the structure of the hand truck operating worm shown in FIG. 6;

FIG. 15 is a schematic view of the cable door lock structure shown in FIG. 2;

Reference numerals illustrate: 1. a ground switch operating shaft; 2. a rear door interlock mechanism; 21. a first limit structure; 211. a bracket; 212. a second limit rod; 2121. a limit groove; 213. a first stop lever; 214. a first resilient biasing member; 215. a limiting wheel; 22. a locking structure; 221. a latch hook; 222. a locking plate; 3. a front door interlock mechanism; 31. a first baffle; 311. a through hole; 312. an operation port; 32. a second baffle; 33. a slider; 331. a track; 3311. a first track; 3312. a second track; 332. a handle; 34. an elastic block; 341. a limiting block; 35. a fastener; 4. a circuit breaker trolley; 41. a first locking plate; 411. a fourth operation hole; 412. a fifth operation hole; 413. a first round hole; 414. a second limiting hole; 42. a handle; 43. a second locking plate; 431. a sixth operation hole; 432. a seventh operation hole; 433. a second round hole; 434. a third limiting hole; 44. a positioning pin; 441. a first portion; 442. a second portion; 443. a third section; 45. the handcart operates the worm; 451. a limiting groove; 46. a third locking plate; 461. a first operation hole; 462. a first limiting hole; 463. a second operation hole; 464. a third operation hole; 47. a third locking hole; 48. a movable groove; 49. a first locking hole; 5. a cable chamber locking structure; 51. a rocker arm; 52. a rocker cam; 53. a hook plate; 54. a cross bar; 55. a fixing plate; 6. a transmission structure; 61. a rocker; 611. a slide hole; 62. arm-saving; 621. a sliding protrusion; 622. a boss; 63. a rotating rod; 64. a drive cam; 641. a blocking lever; 65. a rocker cam; 66. and (3) a bracket.

Detailed Description

The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.

Example 1

As shown in fig. 1 and 2, the five-prevention interlocking device comprises a grounding switch operating shaft 1, and the grounding switch can be switched on and off by forward and reverse rotation; the rear door interlocking mechanism 2 drives the rear door to unlock or lock under the control of forward and reverse rotation of the grounding switch operating shaft 1, and can only rotate the grounding switch operating shaft 1 to switch on the grounding switch under the condition of limiting the locking state of the rear door; a front door interlock mechanism 3 connected to the breaker chamber door and the cable chamber door, for controlling opening and closing of an operation port for operating the ground switch operation shaft 1 by opening and closing of the breaker chamber door and the cable chamber door; the handcart interlocking mechanism is used for connecting the circuit breaker handcart 4 with the grounding switch operation shaft 1, and controlling the operations of the grounding switch operation shaft 1 and the handcart operation worm 45 by positioning the position of the circuit breaker handcart 4, so that the circuit breaker handcart 4 can be closed by the grounding switch when being in a test position, and the circuit breaker handcart 4 is locked; the grounding switch operation shaft 1 penetrates through the handcart cabinet and is arranged between the breaker chamber and the cable chamber; the rear door interlocking mechanism 2 and the front door interlocking mechanism 3 are respectively arranged at two ends of the grounding switch operation shaft 1.

The forward rotation and the reverse rotation are used for describing that the rotation direction is opposite, and after the grounding switch operation shaft rotates in one direction, the direction opposite to the grounding switch operation shaft is opposite.

Further, the rear door interlock mechanism 2 includes a lock structure 22 rotatable with the ground switch operating shaft 1 and capable of locking the rear door, and a first limit structure 21 movable against the rear door and allowing the ground switch operating shaft 1 to rotate.

Specifically, as shown in fig. 3, the locking structure includes a locking hook 221 disposed at one end of the ground switch operating shaft 1 near the rear door, and a locking plate 222 fixed to the rear door and adapted to be hooked by the locking hook 221; when the grounding switch operation shaft 1 rotates, the locking structure 22 can synchronously rotate along with the grounding switch operation shaft 1, the grounding switch is switched on, the locking structure 22 is unlocked, the grounding switch is switched off, and the locking structure 22 is locked; the locking structure ensures that the rear door is locked and cannot be opened when the grounding switch is opened, so that the safe operation of the handcart cabinet is ensured.

The first limiting structure 21 includes a bracket 211 disposed on the ground switch operating shaft 1 near the rear door, a first limiting rod 213 penetrating and fixed on the bracket 211, a second limiting rod 212 capable of moving on the first limiting rod 213 under the action of a first elastic biasing member and the rear door and formed with a limiting groove 2121, and a limiting wheel 215 disposed on the ground switch operating shaft 1 and capable of aligning with the limiting groove and passing through the limiting groove 2121 when the rear door is closed; the first limiting structure compresses the second limiting rod 212 when the rear door is closed, so that the limiting groove 2121 on the second limiting rod 212 is aligned with the limiting wheel 215, and the grounding switch operating shaft 1 can rotate through the first limiting structure 21, so that the grounding switch operating shaft must be operated in the closed state of the rear door.

In the present embodiment, the lock plate 222 and the rear door are fixedly connected by a bolt which is screwed from the rear door to the lock plate 222, and is used for emergency opening of the rear door when the ground switch operation shaft 1 cannot be rotated to open the rear door.

The working principle of the back door interlocking mechanism is as follows:

when the rear door is in a closed state, the second limiting rod 212 is pressed, the second limiting rod 212 is in a compressed state relative to the first limiting rod 213, at this time, the limiting groove 2121 formed in the second limiting rod 212 is aligned with the limiting wheel 215, the limiting wheel 215 can pass through the limiting groove 2121, so that when the grounding switch operating shaft 1 rotates to separate the brake, the locking hook 221 rotates along with the grounding switch operating shaft 1 and is separated from the locking plate 222, and the grounding switch can be opened; if the rear door is in an open state, the second limiting rod 212 returns to an initial state under the action of the elastic first biasing member sleeved on the first limiting rod 213, at this time, the limiting groove 2121 is not aligned with the limiting wheel 215, and when the grounding switch operating shaft 1 is operated, the limiting wheel 215 is blocked by the second limiting rod 212, and the grounding switch operating shaft 1 cannot rotate.

As shown in fig. 4, the front door interlock mechanism 3 of the front door interlock mechanism 3 and the front door includes a first shutter 31 provided on a wall of the handcart cabinet and having an operation port 312 for operating the ground switch operation shaft 1, a second shutter 32 provided in cooperation with the first shutter 31 to form an accommodation space, a slider 33 slidably provided in the accommodation space and capable of opening or closing the operation port 312, and a second limit structure capable of controlling sliding of the slider 33 by positioning states of the breaker chamber door and the cable chamber door, respectively; the sliding member 33 can be slid only when the breaker chamber door and the cable chamber door are closed, so that the operation opening 312 is opened; the operation port 312 is arranged opposite to the grounding switch operation shaft 1 and is suitable for workpiece insertion; the breaker chamber door and the cable chamber door may contact the first barrier 31 when closed, thereby being connected to the second limit structure.

The front door interlocking mechanism 3 realizes the interlocking of the breaker chamber door and the cable chamber door with the grounding switch through the cooperation of the first baffle plate 31, the second baffle plate 32, the sliding piece 33 and the second limiting structure, and only when the breaker chamber door and the cable chamber door are closed, namely, the second limiting structure opposite to the breaker chamber door and the second limiting structure opposite to the cable chamber door are unlocked, the grounding switch operating shaft 1 can be operated to close the grounding switch.

The slider 33 is formed with a handle 332 for grasping and facilitating sliding of the slider 33 at the operation port 312; the slider 33 is pushed down, slides down, opens the operation port 312, is pulled up, and the slider 33 slides up, closing the operation port 312.

The second limiting structure comprises a third limiting structure capable of positioning the states of the breaker chamber door and the cable chamber door, and a fourth limiting structure matched with the third limiting structure and limiting the sliding of the sliding piece 33.

Specifically, the third limiting structure includes a through hole 311 formed in the first baffle 31 and opposite to the breaker chamber door and the cable chamber door, that is, the first baffle 31 is formed with a through hole 311 opposite to the breaker chamber door, the first baffle 31 is formed with a through hole 311 opposite to the cable chamber door, an elastic block 34 limited on the second baffle 32 by a release preventing structure penetrates through the sliding member 33 and is connected with the through hole 311, a second elastic biasing member is further disposed on the elastic block 34, and the elastic block 34 retracts inward or protrudes outward relative to the through hole 311 under the action of the front door and the second elastic biasing member.

The third limiting structure is connected with the breaker chamber door and the cable chamber door by the elastic block 34 passing through the through hole 311, when the breaker chamber door and the cable chamber door are closed, the elastic block 34 is extruded to retract inwards, so that the elastic block 34 is separated from the through hole 311, the limitation of the elastic block 34 on the sliding piece 33 is released, and the sliding piece 33 can slide downwards only when the breaker chamber door and the cable chamber door are closed, namely, the limitation of the elastic block 34 corresponding to the breaker chamber door and the elastic block 34 corresponding to the cable chamber door are released.

In this embodiment, the through hole 311 is square, and one end of the elastic block 34, which is matched with the through hole 311, is rectangular; of course, in other embodiments, the through hole 311 may be configured into other shapes according to practical situations and needs, the elastic block 34 is matched with the through hole 311, for example, the through hole 311 is circular, and the elastic block 34 is cylindrical.

The fourth limiting structure comprises a limiting block 341 formed on the side edge of the elastic block 34 and connected with the sliding piece 33, and a rail 331 formed on the side wall of the sliding piece 33 and adapted for the limiting block 341 to be inserted and move therein; the slide includes a first rail 3311 adapted to move the stopper 341 with the elastic block 34 in a radial direction of the elastic block 34, and a second slide allowing the slider 33 to slide up and down; the elastic block 34 is shaped like a T.

In the above structure, when the breaker chamber door and the cable chamber door are in an open state, the elastic block 34 protrudes outwards relative to the through hole 311, the stopper 341 is located in the first rail 3311 of the rail 331, the stopper 341 and a portion of the elastic block 34 connected with the through hole 311 limit the sliding of the sliding member 33 together, when the breaker chamber and the cable chamber are closed, the elastic block 34 is pressed and retracted inwards relative to the through hole 311, the stopper 341 moves along the first rail 3311 in a direction away from the first baffle 31 and enters the second rail 3312, and when the breaker chamber and the cable chamber door are both closed, the stopper 341 corresponding to the breaker chamber door and the stopper 341 corresponding to the cable chamber door enter the second rail 3312, the sliding member 33 is pressed downwards, and the second rail 3312 moves downwards along the stopper 331341.

The anti-falling structure comprises an anti-falling groove formed at one end of the elastic block 34 penetrating out of the second baffle 32, and a fastening piece 35 inserted into the anti-falling groove to prevent the elastic block 34 from falling off, wherein the fastening piece 35 is a clamp; in the above structure, the fastening member 35 can abut against the outer wall of the second baffle 32, so as to prevent the elastic block 34 from being separated from the second baffle 32.

The second elastic biasing member is disposed between the stopper 341 and the second barrier 32.

The working principle of the front door interlocking mechanism 3 is as follows:

When the circuit breaker handcart 4 reaches a test position, the circuit breaker chamber door and the cable chamber door are closed, the elastic blocks 34 corresponding to the circuit breaker chamber door and the elastic blocks 34 corresponding to the cable chamber door are retracted inwards and separated from the through holes 311, at the moment, the handle 332 is gripped to press the sliding piece 33 downwards, the sliding piece 33 opens the operation opening 312, the grounding switch operation shaft 1 is rotated by the workpiece, the circuit breaker chamber door and the cable chamber door are opened, and the sliding piece 33 is lifted upwards, so that the elastic return is carried out to the position of the through holes 311, and the elastic blocks 34 protrude outwards relative to the through holes 311.

In the handcart cabinet, the flow of the power failure operation of the breaker chamber is as follows: firstly, opening a circuit breaker, then operating the handcart operating worm 45 to swing the circuit breaker handcart 4 from a working position to a test position, then closing the grounding switch, and finally opening a circuit breaker chamber door for maintenance; the flow of the power transmission operation is as follows: the circuit breaker chamber door is closed firstly, then the grounding switch is opened, the circuit breaker handcart 4 is moved from the test position to the working position, and finally the circuit breaker is closed.

As shown in fig. 6, the handcart interlocking mechanism comprises a transmission structure 6 connected with the grounding switch operation shaft 1 and capable of transmitting torque of the grounding switch operation shaft 1 to the circuit breaker handcart 4, a locking structure connected with the transmission structure 6 and preventing the circuit breaker handcart 4 from being pulled out of the circuit breaker chamber when the grounding switch is opened, a limiting structure linked with the locking structure and preventing the circuit breaker handcart 4 from being operated when the grounding switch is closed, and a positioning structure preventing the circuit breaker handcart 4 from being closed when the grounding switch is not in a test position.

In this embodiment, the circuit breaker cart 4 is further provided with a plug structure capable of preventing the circuit breaker cart 4 from slipping out of the circuit breaker chamber; specifically, the plugging structure includes a first locking plate 41 and a second locking plate 43 which are respectively disposed at two sides of the handcart operating worm 45 and are connected in a relatively sliding manner, a first locking hole 49 and a second locking hole which are respectively formed on the side wall of the handcart cabinet and are used for inserting the first locking plate 41 and the second locking plate 43, and a first reset piece and a second reset piece which are respectively used for keeping the state that the first locking plate 41 is inserted into the first locking hole 49 and keeping the state that the second locking plate 43 is inserted into the second locking hole; the first locking plate 41 and the second locking plate 43 are pulled in, the first locking plate 41 and the second locking plate 43 are separated from the first locking hole 49 and the second locking hole respectively, the circuit breaker handcart 4 can be pulled out of the circuit breaker chamber, the first locking plate 41 and the second locking plate 43 are released, the first locking plate 41 and the second locking plate 43 can return to original states under the action of a first reset piece and a second reset piece, namely the circuit breaker handcart 4 is put into the circuit breaker chamber, and the first locking plate 41 and the second locking plate 43 can be automatically inserted into the first locking hole 49 and the second locking hole.

As shown in fig. 7, the transmission structure 6 includes a rocker 61 that swings as the ground switch operating shaft 1 rotates, a knuckle arm 62 that rotates under the action of the rocker 61, a rotating lever 63 fixedly connected to the knuckle arm 62 and that rotates with the knuckle arm 62, and a transmission cam 64 connected to the rotating lever 63 at a position relative to the third lock plate 46; the transmission structure can accurately transmit the motion of the grounding switch operation shaft 1 to the circuit breaker handcart 4, so that the interlocking of the grounding switch operation shaft 1 and the circuit breaker handcart 4 is ensured; the rocker 61 is fixed to the ground switch operation shaft 1 by a rocker cam 65 fixed to the ground switch operation shaft 1; the rotating rod 63 is arranged at the side edge of the circuit breaker handcart 4 through a bracket 66 arranged on the circuit breaker handcart 4, the rotating rod 63 penetrates through two supporting legs of the bracket 66, and the bracket 66 is fixed on the circuit breaker handcart 4 through bolts.

When the grounding switch operating shaft 1 rotates to switch on and off the grounding switch, the rocker 61 swings up and down along with the grounding switch operating shaft 1, the rocker 61 drives the knuckle arm 62 to rotate, and the knuckle arm 62 drives the rotating rod 63 to rotate, so that the transmission cam 64 rotates; when the grounding switch is switched on, the transmission cam 64 acts on the third locking plate 46, the third locking plate 46 is retracted inwards, and when the grounding switch is switched off, the transmission cam 64 is not connected with the third locking plate 46, and the third locking plate 46 is not moved; the transmission structure can accurately transmit the torque of the grounding switch operation shaft 1 to the circuit breaker handcart 4, and ensure the interlocking of the grounding switch operation shaft 1 and the circuit breaker handcart 4.

The cross section of the earthing switch operation shaft 1 is hexagonal, and the rocker cam 65 is formed with a hexagonal hole which is adapted to the earthing switch operation shaft 1 in the axial direction.

In this embodiment, a connection structure is provided between the rocker 61 and the arm 62, and the connection structure includes an oblong sliding hole 611 formed at one end of the rocker connected to the arm 62, and a sliding protrusion 621 formed at an end of the arm 62 and capable of sliding in the sliding hole 611; the above-described connection structure can function to connect and transition the rotational torque of the ground switch operating shaft 1 to the rotational torque of the knuckle arm 62.

In addition, a boss 622 is formed at the connection part of the knuckle arm 62 and the rotating rod 63 to increase the connection area of the knuckle arm 62 and the rotating rod 63; the above structure can increase the reliability of the fixed connection of the knuckle arm 62 and the rotating lever 63.

As shown in fig. 7 and 8, the locking structure includes a third locking plate 46 slidably connected to a trolley operating worm 45 of the circuit breaker trolley 4 and disposed opposite to a transmission cam of the transmission structure, a third locking hole 47 formed in a side wall of the circuit breaker chamber and adapted to be inserted into the third locking plate 46, and a third reset member connecting the third locking plate 46 and the side wall of the circuit breaker chamber such that the third locking plate 46 is inserted into the third locking hole 47; when the grounding switch is opened, the third locking plate 46 is inserted into the third locking hole 47 under the action of the third reset piece, and when the grounding switch is closed, the third locking plate 56 is separated from the third locking hole 47 under the action of the transmission cam 65.

The locking structure locks the circuit breaker handcart 4 in the circuit breaker chamber by using the third locking plate 46, a third locking hole 47 and a third reset piece, wherein the third locking plate 46 is inserted in the third locking hole 47 under the action of the third reset piece; when the grounding switch is switched on, the plug-in structure is not locked by the locking structure, the circuit breaker handcart 4 can be unlocked by pulling the first locking plate 41 and the second locking plate 43 leftwards, and the circuit breaker handcart 4 is pulled outwards to draw out the circuit breaker handcart 4 from the circuit breaker chamber; when the grounding switch is opened, the plug structure is locked by the locking structure, the first locking plate 41 and the second locking plate 43 cannot be pulled leftwards, and the circuit breaker handcart 4 cannot be pulled out of the circuit breaker chamber; the locking structure ensures that the circuit breaker handcart 4 can be pulled out of the circuit breaker chamber only after the grounding switch is closed, so that the circuit breaker is safe and reliable.

The third locking plate 46 is arranged side by side with the first locking plate 41.

As shown in fig. 6, 11 and 14, the restriction structure includes a restriction groove 451 formed at a junction of the cart operation worm 45 and the third locking plate 46, a first operation hole 461 formed at the third locking plate 46 to allow the cart operation worm 45 to be rotationally operated therein, and a first restriction hole 462 engaged with the restriction groove 451 to restrict the rotation operation of the cart operation worm 45 when the third locking plate 46 is moved leftward by the transmission cam 64; when the grounding switch is in a switching-off state, the locking structure is locked, the third locking plate 46 is inserted into the third locking hole 47, the limiting groove 451 is located in the first operation hole 461, the handcart operation worm 45 can rotate, when the grounding switch is in a switching-on state, the transmission cam 64 unlocks the locking structure, the third locking plate 46 moves towards the handcart operation worm 45, the limiting groove 451 enters into the first limiting hole 462, and the handcart operation worm 45 cannot rotate.

In the present embodiment, as shown in fig. 12 and 13, first and second circular holes 413 and 414, second and third circular holes 433 and 434 corresponding to the first and first regulating holes 461 and 461 in the regulating structure are provided at positions where the first and second locking plates 41 and 43 are connected to the cart operation worm.

The positioning structure comprises a positioning pin 44 which can be outwards protruded under the action of the circuit breaker handcart 4 and is inwards restored under the action of a fourth reset piece, a second operation hole 463 which is formed at the joint of the third locking plate 46 and the positioning pin 44 and allows the positioning pin 44 to move in and out relative to the third locking plate 46, and a third operation hole 464 which allows the third locking plate 46 to move leftwards when the positioning pin 44 is propped against the circuit breaker handcart 4 and prevents the third locking plate 46 from moving leftwards when the positioning pin 44 is not connected with the circuit breaker handcart 4; the locating pin 44 moves in and out of the circuit breaker trolley 4.

In the above positioning structure, the positioning pin 44, the fourth reset element, the circuit breaker cart 4, and the third locking plate 46 are mutually matched, when the circuit breaker cart 4 is located at the working position, the circuit breaker cart 4 is not connected with the positioning pin 44, at this time, the positioning pin 44 is inserted into the second operation hole 463 under the action of the fourth reset element to limit the third locking plate 46 to move leftwards, and the grounding switch cannot be closed; when the circuit breaker trolley 4 is in the test position and the positioning pin 44 abuts against the circuit breaker trolley 4, the positioning pin 44 protrudes outwards, and the transmission cam 64 can enable the third locking plate 46 to move; when the circuit breaker handcart 4 is not at the test position, the positioning pin 44 is not in contact with the circuit breaker handcart 4, and returns to a natural state inwards under the action of the fourth reset piece, so that the third locking plate 46 cannot move.

The structure design is ingenious, safe and reliable, and the grounding switch cannot be switched on when the circuit breaker handcart 4 is in a working position, so that misoperation is prevented.

As shown in fig. 10 and 11, the positioning pin 44 includes a first portion 441 which is capable of being connected to the circuit breaker trolley 4 and provided with a fourth restoring member, a second portion 442 which is connected to an end of the first portion 441 remote from the circuit breaker trolley 4 and is movable in the second operation hole 463, and a third portion 443 which is provided to an end of the second portion 442 remote from the first portion 441 and is capable of preventing the positioning pin 44 from coming out of the third locking plate 46; the fourth restoring member can prevent the positioning pin 44 from coming out of the second operation hole 463 when protruding outwards, that is, the fourth restoring member not only plays a role in restoring the positioning pin 44, but also plays a role in preventing falling, and under the actions of the fourth restoring member and the third portion 443, the positioning pin 44 is fixed on the third locking plate 36.

The first portion 441 having the above-described structure is freely switchable between the second operation hole 463 and the third operation hole 464, and when the positioning pin 44 protrudes outward, the first portion 441 enters the second operation hole 463, and at this time, the third locking plate 46 is movable leftward; the second portion 442 is adapted to the second operation hole 463, and when the second portion 442 is inserted into the second operation hole 463, the positioning pin 44 cannot enter the third operation hole 464, and the third locking plate 46 cannot move leftward; the third portion 443 prevents the positioning pin 44 from coming out of the second operation hole 463 when the positioning pin 44 returns inward; the above positioning pin is converted in the second operation hole 463 by the first portion 441 and the second portion 442 under the action of the circuit breaker cart 4 and the fourth reset member, so that the positioning pin 44 can limit the movement of the third locking plate 46, and further the circuit breaker cart 4 and the grounding switch are interlocked.

As shown in fig. 12 and 13, the positioning pin 44 is provided at the junction of the first locking plate 41, the second locking plate 43 and the third locking plate 46, the first locking plate 41 is provided with a fourth operation hole 411 adapted to receive a second portion 442 of the positioning pin 44 and a fifth operation hole 412 to restrict movement of the first locking plate 41, and the second locking plate 43 is provided with a sixth operation hole 431 adapted to receive the second portion 442 of the positioning pin 44 and a seventh operation hole 432 to restrict movement of the second locking plate 43.

The above structure can cause the first locking plate 41, the second locking plate 43 and the grounding switch to be interlocked, when the third locking plate 46 is unlocked, the first locking plate 41 and the second locking plate 43 are also unlocked, the first portion 441 of the positioning pin 44 is pulled inwards to enter the fifth operation hole 412 from the fourth operation hole 411 on the first locking plate 41, and enters the seventh operation hole 432 from the sixth operation hole 431 of the second locking plate 43; when the third locking plate 46 is restrained, the second portion 442 of the positioning pin 44 is also inserted into the fourth and sixth operation holes 411 and 431 at the same time, so that the first and second locking plates 41 and 46 are also restrained; thus, when the circuit breaker trolley 4 is in the working position, the first locking plate 41 and the second locking plate 43 cannot slide inward, and the circuit breaker trolley 4 cannot be drawn out of the circuit breaker chamber, so that the safe operation of the trolley case is ensured.

As shown in fig. 5 and 9, a blocking structure is provided between the transmission cam 64 and the slider 33 capable of opening and closing the operation port 312 of the ground switch operation shaft 1, the blocking structure being engaged with the third locking plate 46, the blocking structure being capable of blocking the slider 33 from sliding downward to expose the operation port 312 when the circuit breaker cart 4 is not moved to the test position; the blocking structure includes a blocking lever 641 provided to the transmission cam 64 and connectable to the slider 33; the blocking lever 641 is disposed at a side close to the slider 33 when the transmission cam 64 is in a natural drooping state.

The blocking structure prevents the sliding member 33 from sliding downwards when the circuit breaker handcart 4 is at the test position by using the blocking rod 641 on the third locking plate 46 and the transmission cam 64, so that the operation port 312 for operating the grounding switch operation shaft 1 is exposed, when the circuit breaker handcart 4 is not moved from the working position to the test position, that is, the grounding switch is in the opening state, the third locking plate 46 is locked by the positioning structure, the third locking plate 46 cannot move, at this time, the sliding member 33 is pressed downwards, the blocking rod 641 is connected with the sliding member 33, one end of the transmission cam 64 away from the blocking rod 641 abuts against the third locking plate 46, the third locking plate 46 prevents the transmission cam 64 from continuing to rotate, so that the sliding member 33 cannot slide downwards, and further the operation port 312 cannot be opened, and the grounding switch cannot be closed; the above structure ensures that the earthing switch operation shaft 1 can be operated to close the earthing switch only when the breaker trolley 4 is rocked to the test position.

Further, handles 42 are provided on the first lock plate 41 and the second lock plate 43; the above-described structure is to facilitate the holding operation of the first locking plate 41 and the second locking plate 43.

The third locking plate 46 is provided outside the first locking plate 41; the third locking plate 46 is provided with a movable groove 48 which is suitable for the movement of the handle 42 at the position of the handle 42 opposite to the first locking plate 41; specifically, the length dimension of the movable slot 48 is not smaller than the moving distance dimension of the first locking plate 41, when the locking structure is locked, the handle 42 is located at one end of the movable slot 48 close to the cart operation worm 45, the handle 42 cannot be pulled toward the cart operation worm 45, when the locking structure is unlocked, the handle 42 is located at one end of the movable slot 48 far away from the cart operation worm 45, and the handle 42 can be pulled toward the cart operation worm 45; so that the handle 42 can cooperate with the locking structure.

One end of the third locking plate 46 connected with the transmission cam 64 is formed with an inclined surface matched with the transmission cam 64; the above structure is for convenience in that the transmission cam 64 acts on the third locking plate 46.

The operating principle of the handcart interlocking mechanism is as follows:

When the circuit breaker handcart 4 moves from the working position to the test position, the positioning pin 44 in the positioning structure protrudes outwards from the second operation hole 463 under the action of the circuit breaker handcart 4, the third locking plate 46 is unlocked and movable, at this time, the third locking plate 46 cannot prop against the transmission cam 64, the sliding piece 33 is pressed downwards, the sliding piece 33 moves downwards, the operation opening 312 is exposed, when the grounding switch operation shaft 1 rotates to switch on the grounding switch, the rocker 61 of the transmission structure 6 in the handcart interlocking mechanism also rotates along with the rocker, so that the rotating rod 63 is driven to rotate, the transmission cam 64 connected to the rotating rod 63 abuts against the third locking plate 46 in the locking structure, the third locking plate 46 is pushed towards the direction of the handcart operation worm 45, in this way, the first locking plate 41 is pulled inwards, the second locking plate 462 is pulled out of the operation worm 45, and the first locking plate 45 cannot be pulled out of the operation worm 45, and the first locking plate 45 can be simultaneously pulled out of the locking hole 45, and the circuit breaker 45 cannot be prevented from being rotated by the operation worm 45; when the earthing switch operating shaft 1 rotates to switch off the earthing switch, the rocker 61 rotates to drive the rotating rod 63 and the transmission cam 64 on the rotating rod 63 to rotate, the transmission cam 64 temporarily leaves the third locking plate 46 and does not abut against the third locking plate 46, the third locking plate 46 moves under the action of the third resetting piece and is inserted into the third locking hole 47, meanwhile, the positioning pin 44 returns inwards to a natural state under the action of the fourth resetting piece, the third locking plate 46 is locked, the first locking plate 41 and the second locking plate 43 cannot be pulled inwards, the circuit breaker handcart 4 cannot be pulled out of the circuit breaker chamber, meanwhile, the limiting groove 451 of the handcart operating worm 45 enters the first operating hole 462, the handcart operating worm 45 can be rotated to move the circuit breaker handcart 4 from the working position to the circuit breaker position, and the third locking plate 64 cannot be matched with the circuit breaker chamber 33 when the cam 33 is not slid, and the sliding of the circuit breaker is prevented from being exposed under the test position of the transmission cam 64.

The handcart interlocking mechanism is safe and reliable, through the cooperation among a plurality of structures, can effectually prevent when the circuit breaker handcart 4 does not reach the test position, earthing switch operating shaft 1 carries out the switch-on to the earthing switch, and can prevent when the earthing switch-on, operate handcart operating worm 45 removes circuit breaker handcart 4 carries out the circuit breaker switch-on, and prevent when the earthing switch breaks the floodgate, can with circuit breaker handcart 4 pull out the circuit breaker room.

As shown in fig. 15, in the present embodiment, a cable chamber locking structure 5 capable of simultaneously locking the cable chamber door when the ground switch is opened is provided between the ground switch operating shaft 1 and the cable chamber door, the cable chamber locking structure 5 including a swing arm 51 that rotates with the ground switch operating shaft 1, and a swing arm 51 that swings with the swing arm 51 and is formed with a hook connected to a cross bar 54 fixed to the cable chamber door, the cross bar 54 being fixed to the cable chamber door by a fixing plate 55; the rocker arm 51 is connected to the ground switch operation shaft 1 through a rocker arm cam 52, and the rocker arm 51 swings up and down along with the ground switch operation shaft 1.

In addition, in the present embodiment, the first restoring member, the second restoring member, the third restoring member, and the fourth restoring member are tension springs, and the first elastic biasing member and the second elastic biasing member are compression springs.

The working principle of the five-prevention interlocking device is as follows:

When the handcart cabinet is subjected to door opening maintenance, the breaker chamber door, the cable chamber door and the rear door are all in a closed state, at this time, the front door interlocking mechanism 3 is unlocked, the first limiting structure 21 of the rear door interlocking mechanism 2 is also unlocked, the breaker is firstly opened, the handcart operating worm 45 is rotated by using the workpiece to move the breaker handcart 4 from a working position to a test position, at this time, the positioning structure of the breaker handcart 4 is unlocked, the third locking plate 46 is allowed to move, the blocking structure is also unlocked, the blocking rod 641 allows the sliding piece 33 to move, then the handle 332 is pressed, the sliding piece 33 slides downwards to expose the operating port 312, the grounding switch operating shaft 1 in the rotating operating port 312 is closed, at this time, the transmission structure 6 pushes the third locking plate 46 to move towards the handcart operating worm 45, the third locking hole 47 is separated from the pulling structure, the intermediate plate 42 is held to pull the first locking plate 42 to the handcart operating worm 45, the breaker chamber 45 is simultaneously pushed to the intermediate plate and the second locking plate 43 is pulled to the handcart operating port 45, and the breaker chamber 45 is simultaneously opened, and the elastic sliding piece 33 cannot be opened.

After the maintenance is completed, the breaker chamber door, the cable chamber door and the rear door are closed first, the front door interlocking mechanism 3 is unlocked, the first limiting structure 21 of the rear door interlocking mechanism 2 is also unlocked, then the handle 332 is pressed, the sliding member 33 slides downwards to expose the operation opening 312, the grounding switch operation shaft 1 in the rotation operation opening 312 is used for opening the grounding switch and resetting the sliding member 33, at this time, the transmission structure 6 in the handcart interlocking mechanism is temporarily separated from the locking structure, the third locking plate 46 is inserted into the third locking hole 47, the plug-in structure is locked by the locking structure, the handcart 4 cannot be pulled out of the breaker chamber, the limiting structure simultaneously unlocks the handcart operation worm 45 so that the handcart operation worm 45 can rotate, then the handcart operation worm 45 is rotated by a workpiece to open the grounding switch of the handcart 4 from the test position to the working position, at this time, the third locking plate 46 is inserted into the third locking hole 47, the handcart interlocking structure cannot be pulled out of the breaker chamber, and finally the sliding member 641 can be blocked.

The five-prevention interlocking device utilizes the front door interlocking mechanism, the rear door interlocking mechanism and the handcart interlocking mechanism to respectively generate linkage relation with the grounding switch operating shaft, so that the grounding switch operating shaft 1 can be operated to open and close the grounding switch under the condition that the circuit breaker chamber door, the cable chamber door and the rear door are all closed, the circuit breaker handcart 4 can be operated to close the grounding switch by the grounding switch operating shaft and draw out the circuit breaker handcart 4 from the circuit breaker chamber, and the grounding switch cannot shake the circuit breaker handcart 4 to enter the working position after closing, thereby achieving the five-prevention requirement and greatly improving the safety performance of the handcart cabinet.

Example 2

The embodiment provides a handcart cabinet, which comprises the five-prevention interlocking device provided in the embodiment 1.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims

1. A five-prevention interlocking device is characterized by comprising

The grounding switch operating shaft (1) can enable the grounding switch to be switched on and off through forward and reverse rotation;

The rear door interlocking mechanism (2) drives the rear door to unlock or lock under the control of forward and reverse rotation of the grounding switch operating shaft (1), and can only rotate the grounding switch operating shaft (1) to switch on the grounding switch under the condition of limiting the locking state of the rear door;

a front door interlocking mechanism (3) connected with the breaker chamber door and the cable chamber door, and controlling the opening and closing of an operation port for operating the grounding switch operation shaft (1) through the opening and closing of the breaker chamber door and the cable chamber door;

the handcart interlocking mechanism is used for connecting the circuit breaker handcart (4) with the grounding switch operation shaft (1), controlling the operation of the grounding switch operation shaft (1) and the handcart operation worm (45) by positioning the position of the circuit breaker handcart (4), enabling the circuit breaker handcart (4) to complete the closing of the grounding switch when being in a test position and locking the circuit breaker handcart (4);

The rear door interlocking mechanism (2) comprises a locking structure (22) which rotates along with the grounding switch operation shaft (1) to unlock and lock the rear door, and a first limiting structure (21) which can position the rear door and limit the rotation of the grounding switch operation shaft (1);

The locking structure (22) comprises a lock hook (221) arranged at one end of the grounding switch operation shaft (1) close to the rear door and a locking plate (222) fixed at the rear door and suitable for hooking the lock hook (221);

The first limiting structure (21) comprises a bracket (211) which is arranged on the grounding switch operation shaft (1) and is close to the rear door, a first limiting rod (213) which penetrates through and is fixed on the bracket (211), a second limiting rod (212) which can move on the first limiting rod (213) under the action of a first elastic biasing member (214) and the rear door and is provided with a limiting groove (2121) in a forming way, and a limiting wheel (215) which is arranged on the grounding switch operation shaft (1) and can be aligned with the limiting groove (2121) when the rear door is closed and passes through the limiting groove (2121);

The front door interlocking mechanism comprises a first baffle (31) which is arranged on the wall of the handcart cabinet and is provided with an operation opening (312) for operating a grounding switch operation shaft (1), a second baffle (32) which is matched with the first baffle (31) to form an accommodating space, a sliding piece (33) which is slidably arranged in the accommodating space and can open or close the operation opening (312), and a second limiting structure which can control the sliding of the sliding piece (33) by positioning the states of the breaker chamber door and the cable chamber door; the sliding piece (33) can be slid when the breaker chamber door and the cable chamber door are closed, so that the operation port (312) is opened;

the second limiting structure comprises a third limiting structure capable of positioning the states of the breaker chamber door and the cable chamber door and a fourth limiting structure which is matched with the third limiting structure and limits the sliding of the sliding piece (33);

the third limiting structure comprises a through hole (311) formed in the first baffle plate (31) and opposite to the breaker chamber door and the cable chamber door respectively, an elastic block (34) limited on the second baffle plate (32) penetrates through the sliding piece (33) to be connected with the through hole (311), and the elastic block (34) is retracted inwards or protruded outwards relative to the through hole (311) under the action of the front door and the second elastic biasing piece;

the fourth limiting structure comprises a limiting block (341) which is formed on the side edge of the elastic block (34) and connected with the sliding piece (33), and a track (331) which is formed on the side wall of the sliding piece (33) and is suitable for the limiting block (341) to be inserted into and move in;

The handcart interlocking mechanism comprises a transmission structure (6) which is connected with a grounding switch operation shaft (1) and can transmit torque of the grounding switch operation shaft to a circuit breaker handcart (4), a locking structure which is connected with the transmission structure (6) and can prevent the circuit breaker handcart (4) from being pulled out of the circuit breaker chamber when the grounding switch is disconnected, a limiting structure which is linked with the locking structure and can prevent the circuit breaker handcart (4) from being operated when the grounding switch is closed, and a positioning structure which can prevent the circuit breaker handcart (4) from being closed when the grounding switch is not in a test position;

The transmission structure (6) comprises a rocker (61) swinging along with the rotation of the grounding switch operation shaft (1), a knuckle arm (62) rotating under the action of the rocker (61), a rotating rod (63) fixedly connected with the knuckle arm (62) and rotating along with the knuckle arm (62), and a transmission cam (64) connected with the rotating rod (63) at a position relative to the third locking plate (46);

The locking structure comprises a third locking plate (46) which is slidably connected with the handcart operation worm (45) of the circuit breaker handcart (4) and is arranged opposite to a transmission cam (64) of the transmission structure, a third locking hole (47) which is formed on the side wall of the circuit breaker chamber and is in fit connection with the third locking plate (46), and a third reset piece which is connected with the third locking plate (46) and the side wall of the circuit breaker chamber, so that the third locking plate (46) is inserted into the third locking hole (47);

The limiting structure comprises a limiting groove (451) formed at the joint of the handcart operating worm (45) and the third locking plate (46), a first operating hole (461) formed at the third locking plate (46) and allowing the handcart operating worm (45) to rotate and operate in the first operating hole, and a first limiting hole (462) matched with the limiting groove (451) and limiting the rotation operation of the handcart operating worm (45) when the third locking plate (46) moves leftwards under the action of the transmission cam (64);

The positioning structure comprises a positioning pin (44) which can be outwards protruded under the action of the circuit breaker handcart (4) and is inwards restored under the action of a fourth resetting piece, a second operation hole (463) which is formed at the joint of the third locking plate (46) and the positioning pin (44) and allows the positioning pin (44) to move in and out relative to the third locking plate (46), and a third operation hole (464) which allows the third locking plate (46) to move leftwards when the positioning pin (44) is propped against the circuit breaker handcart (4) and prevents the third locking plate (46) from moving leftwards when the positioning pin (44) is not connected with the circuit breaker handcart (4);

A blocking structure capable of preventing the grounding switch from being closed when the circuit breaker handcart (4) does not reach a test position is arranged between the transmission cam (64) of the transmission structure (6) and the sliding piece (33).

2. The five-prevention interlocking device according to claim 1, wherein the blocking structure comprises a blocking lever (641) provided to the transmission cam (64) and connectable with an upper wall of the slider; the blocking lever (641) restricts the sliding of the slider (33) under the engagement of the third locking plate (46).

3. The five-prevention interlocking device according to claim 1, characterized in that a cable chamber locking structure (5) for locking the cable chamber door when the earthing switch is opened is provided between the earthing switch operating shaft (1) and the cable chamber door, the cable chamber locking structure (5) comprising a rocker arm (51) rotating with the earthing switch operating shaft (1), and a hooking plate (53) swinging with the rocker arm (51) and provided with a cross bar (54) connected with the cable chamber door.

4. A handcart cabinet comprising a five-prevention interlocking device according to any one of claims 1-3.