CN220106342U - Straight-swinging type grounding switch with closing self-locking function - Google Patents

Abstract

The utility model discloses a straight-swinging type grounding switch with a closing self-locking function, which relates to power system application equipment and comprises a fixed contact, a conductive contact finger, a grounding knife tube, a fixed plate, a rotating shaft and a support, wherein the fixed plate is sleeved on the rotating shaft, the grounding knife tube is arranged on the fixed plate, the top of the grounding knife tube is provided with the conductive contact finger and flexible connection, the conductive contact finger rotates along with the rotating shaft to be in contact with the fixed contact to realize closing, and the straight-swinging type grounding switch is also provided with a self-locking device, and the self-locking device comprises a hook plate, a first hook, a second hook, a pull rod, a limiting pin and a hoop. The automatic locking device of the hook is simple in structure, the risk that the grounding knife tube falls off under the action of electric power is avoided, the conductive contact finger is reliably contacted with the static contact, the design of the silver coating is avoided, mechanical abrasion in the opening and closing process is avoided, the opening and closing operation is simple and quick, the environment adaptability and the higher voltage-resistant level are good, and the overall grounding switch performance is greatly improved.

Description

Straight-swinging type grounding switch with closing self-locking function

Technical Field

The utility model relates to power system application equipment, in particular to a straight-swinging type grounding switch with a closing self-locking function.

Background

The Earthing Switch (commonly called as Earthing Switch) refers to a mechanical Earthing device for releasing electrostatic charges of equipment and circuits to be overhauled and ensuring personal safety of overhaulers during power failure overhauling. It can withstand current for a certain period of time in abnormal situations (e.g. short circuit) but not normally through load current. The earthing switch and the disconnector are often combined to one device, in which case the disconnector is provided with an earthing switch in addition to the main contact for earthing one end of the disconnector after switching off. The main contact and the ground switch are typically mechanically interlocked in such a way that the ground switch cannot be closed when the disconnector is closed and the main contact cannot be closed when the ground switch is closed.

The existing high-voltage grounding switch structure comprises the following characteristics: when the grounding switch is used independently, the fixed contact is arranged on the wiring terminal at the upper end of the insulating support, and when the grounding switch is matched with the isolating switch for use, the fixed contact is arranged on the main conductor at one side of the isolating switch. The grounding cutter tube is arranged on the grounding cutter rotating shaft through the fixing plate, and the tail end of the cutter tube is provided with the conductive contact finger. The grounding knife tube swings along with the rotation of the grounding knife rotating shaft to drive the conductive contact finger to be separated from the static contact to finish the switching-on/off action.

The existing grounding switch has the following defects:

1. the closing locking is generally carried out by a manual mechanism, and when the interlocking of a mechanism operating rod and a ground knife rotating shaft as well as the ground knife rotating shaft and a fixed plate fails, the ground knife pipe has the hidden trouble of falling off under the power of the power supply;

2. the conductive contact finger generally adopts self-deformed elastic force to clamp the static contact, and the contact finger can deform for a long time to cause insufficient clamping force and generate virtual connection phenomenon;

3. the fixed contact, the conductive contact finger, the grounding knife tube, the fixed plate, the rotating shaft and the support are grounded through a conductive loop, and the fixed plate, the rotating shaft and the support are made of galvanized steel materials, so that the conductivity is poor;

4. after multiple operations, the problems of mechanical abrasion, dislocation of the opening and closing positions and insufficient insertion depth of the static contact and the conductive contact finger easily occur.

Disclosure of Invention

In order to solve the technical problems, the utility model provides the straight-swinging type grounding switch with the closing self-locking function, which has a stable structure, and the conductive contact finger is tightly meshed with the static contact, so that the good conductivity and the excellent quality of the whole device are ensured.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

the straight-swinging type grounding switch with the closing self-locking function comprises a fixed contact, a conductive contact finger, a grounding knife tube, a fixed plate, a rotating shaft and a bracket, wherein the fixed plate is sleeved on the rotating shaft, the grounding knife tube is arranged on the fixed plate, the top of the grounding knife tube is provided with the conductive contact finger and soft connection, the conductive contact finger contacts the fixed contact along with the rotation of the rotating shaft to realize closing, the straight-swinging type grounding switch is also provided with a self-locking device, the self-locking device comprises a hook plate, a first hook, a second hook, a pull rod, a limiting pin and a hoop, the hook plate is fixedly arranged on the bottom surface of the fixed contact, the hoop is fixedly arranged on both sides of the fixed plate on the rotating shaft and the whole grounding knife tube respectively through two U-shaped bolts, the first hook and the second hook are mutually hooked and are fixedly arranged between the grounding knife tube and the two contact plates of the conductive contact finger through bolts, the first hook and the second hook can eccentrically rotate around respective bolts, a torsion spring is arranged on the first hook, the other end of the torsion spring is fixed on a conductive contact finger, the first hook head of the first hook is hooked with a hook plate, the other end of the second hook is connected with the upper end of a pull rod, the lower end of the pull rod is connected with a limiting pin, the limiting pin is fixedly arranged on a hoop, a groove is arranged on a fixed plate, the limiting pin can move in the groove of the fixed plate, in a closing state, the first hook head of the first hook is positioned on the inner side of the hook plate to form a hooking lock catch, and is fixed at a locking position through torsion of the torsion spring arranged on the first hook to form a lock, when a rotating shaft rotates, the hoop is driven to rotate, the limiting pin moves along with the rotation of the hoop, when the limiting pin moves in the groove of the fixed plate and is not contacted with the fixed plate, the pull rod moves along with the limiting pin to generate radial displacement, and when the limiting pin moves in the groove of the fixed plate and contacts with the fixed plate, the limiting pin continuously moves to drive the fixed plate to rotate, and the grounding knife tube is driven to rotate until the grounding knife tube is separated from the fixed contact to complete the brake separating action.

The grounding knife tube adopts a high-strength aluminum alloy square tube, the conductive contact finger adopts an external pressure type spring structure, and a silver plating layer is arranged at the conductive contact part of the conductive contact finger and the static contact.

The automatic locking device for the hook is simple in structure, the risk that the grounding knife tube falls off under the action of electric power is avoided, the conductive contact finger is reliably contacted with the static contact, the silver coating is designed, mechanical abrasion in the opening and closing process is avoided, the conductivity of the device is improved, the opening and closing operation is simple and quick, the device has good environment adaptability and higher voltage resistance level, the performance of the whole grounding switch is greatly improved, the self-locking device is simple in structure, accessories are easy to obtain, the cost is low, and the automatic locking device is suitable for large-scale popularization and application.

Drawings

FIG. 1 is a front view of a grounding switch of the present utility model;

FIG. 2 is a side view of the grounding switch of the present utility model;

FIG. 3 is a schematic illustration of the mounting of the anchor ear of the grounding switch of the present utility model;

FIG. 4 is a schematic diagram illustrating the installation of the grounding switch stationary contact and the closing self-locking device of the present utility model;

fig. 5 is a schematic view of the installation of the fixing plate of the grounding switch of the present utility model.

Detailed Description

The utility model is described in detail below with reference to the attached drawings and the specific embodiments:

as shown in fig. 1-5, the straight-swing type grounding switch with a closing self-locking function comprises a fixed contact 12, a conductive contact finger 9, a grounding knife tube 4, a fixed plate 3, a rotating shaft 1 and a bracket, wherein the fixed plate 3 is sleeved on the rotating shaft 1, the grounding knife tube 4 is arranged on the fixed plate 3, the conductive contact finger 9 and a flexible connection 10 are arranged at the top of the grounding knife tube 4, the conductive contact finger 9 rotates along with the rotating shaft 1 to be in contact with the fixed contact 12 to realize closing, the straight-swing type grounding switch is also provided with a self-locking device, the self-locking device comprises a hook plate 13, a first hook 7, a second hook 6, a pull rod 5, a limiting pin 11 and a hoop 2, the hook plate 13 is fixedly arranged on the bottom surface of the fixed contact 12, the hoop 2 is respectively fixedly arranged on two sides of the fixed plate 3 and the grounding knife tube 4 on the rotating shaft 1 through two U-shaped bolts, the first hook 7 and the second hook 6 are mutually hooked and fixedly arranged between the grounding knife tube 4 and the two contact plates of the conductive contact finger 9 through bolts, the first hook 7 and the second hook 6 can eccentrically rotate around the respective bolts, the first hook 7 is provided with a torsion spring 8, the other end of the torsion spring 8 is fixedly arranged on the conductive contact finger 9, the hook head of the first hook 7 is hooked with a hook plate 13, the other end of the second hook 6 is connected with the upper end of the pull rod 5, the lower end of the pull rod 5 is connected with a limiting pin 11, the limiting pin 11 is fixedly arranged on the anchor ear 2, a groove is arranged on the fixed plate 3, the limiting pin 11 can move in the groove of the fixed plate 3, in a closing state, the hook head of the first hook 7 is positioned at the inner side of the hook plate 13 to form a hooking lock catch, and is fixedly arranged at a locking position through the torsion force of the torsion spring 8 arranged on the first hook 7 to form a lock, when the rotating shaft 1 rotates, the anchor ear 2 is driven to rotate, the limiting pin 11 moves along with the rotation of the anchor ear 2, when the limiting pin 11 moves in the groove of the fixed plate 3 and is not contacted with the fixed plate 3, the fixed plate 3 does not rotate, the pull rod 5 moves along with the limiting pin 11 to generate radial displacement, the second hook 6 is pulled to rotate, the first hook 7 is driven to move and the hook plate 13 is tripped, unlocking is achieved, and after the limiting pin 11 moves in the groove of the fixed plate 3 and is contacted with the fixed plate 3, the limiting pin 11 continues to move to drive the fixed plate 3 to rotate, and the grounding cutter tube 4 is driven to rotate until the grounding cutter tube is separated from the fixed contact 12.

In the preferred embodiment, the grounding cutter tube 4 is a high-strength aluminum alloy square tube, the conductive contact finger 9 is an external pressure spring structure, and a silver plating layer is disposed at a conductive contact position between the conductive contact finger 9 and the static contact 12.

The utility model can be used as a grounding switch alone or in combination with an isolating switch. When the static contact 12 is used as a grounding switch independently, the static contact 12 is arranged on an upper end terminal of an insulating support column, and when the static contact is matched with a disconnecting switch, the static contact 12 is arranged on a main conductor at one side of the disconnecting switch. The rotating shaft 1 is connected with the mechanism through a transition crank arm, an operating rod and the like.

When the brake is opened, the rotating shaft 1 is driven to rotate through the manual mechanism, at the moment, the hoop 2 is fixed with the rotating shaft 1, the hoop 2 can rotate along with the rotating shaft 1, meanwhile, the limiting pin 11 can move in the groove of the fixed plate 3 along with the rotation of the hoop 2, before the limiting pin 11 contacts with the edge of the groove of the fixed plate 3, the fixed plate 3 is directly sleeved on the rotating shaft 1, and cannot rotate along with the rotating shaft 1, so that the positions of the grounding knife tube 4 and the conductive contact finger 9 are unchanged, one end of the pull rod 5 moves along with the limiting pin 11, the other end of the pull rod drives the driving hook 6 to deflect, and the driving hook two 6 drives the locking hook one 7 to deflect to finish tripping. And the operating mechanism is continued, and the rotating shaft 1 drives the anchor ear 2 to rotate continuously. When the limiting pin 11 contacts with the edge of the fixed plate 3, the limiting pin 11 drives the fixed plate 3 to rotate, at the moment, the grounding knife assembly integrally rotates along with the fixed plate 3, the conductive contact finger 9 is separated from the fixed contact 12, and the brake separation is completed.

When the switch-on is performed, the rotating shaft 1 is driven to rotate by the manual mechanism, so that the anchor ear 2 and the limiting pin 11 are driven to rotate until the limiting pin 11 contacts with the edge of the groove of the fixed plate 3. Continuing the operating mechanism, the rotating shaft 1 continues to rotate, at the moment, the limiting pin 11 can drive the fixed plate 3 to rotate along with the rotating shaft 1, the grounding knife assembly is integrally rotated along with the fixed plate 3 towards the closing direction, after the outer edge of the hook head of the first hook 7 is contacted with the hook plate 13, the hook head of the first hook 7 can rotate along the round edge of the hook head to cross the hook plate 13, and reversely reset under the action of the torsion spring 8, so that the hook head of the first hook 7 enters the inner side of the hook plate 13 to realize self-locking, and finally closing is completed.

It should be understood that the above description is not intended to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the particular embodiments disclosed, and that the utility model is not limited to the particular embodiments disclosed, but is intended to cover modifications, adaptations, additions and alternatives falling within the spirit and scope of the utility model.

Claims (2)

1. The utility model provides a straight-swinging type grounding switch with closing self-locking function, includes stationary contact (12), electrically conductive contact finger (9), earthing knife-switch tube (4), fixed plate (3), pivot (1) and support, fixed plate (3) suit is on pivot (1), earthing knife-switch tube (4) set up on fixed plate (3), earthing knife-switch tube (4) top sets up electrically conductive contact finger (9) and flexible coupling (10), electrically conductive contact finger (9) rotate along with pivot (1) and contact with stationary contact (12) and realize the closing a floodgate, characterized in that, this straight-swinging type grounding switch still sets up self-locking device, self-locking device includes hook plate (13), couple one (7), couple two (6), pull rod (5), spacer pin (11) and staple bolt (2), hook plate (13) set up on the bottom surface of stationary contact (12) respectively fixed plate (3) and earthing knife-switch tube (4) are set up in two U type bolts respectively, couple one and two both sides of rotatable contact knife-switch (7) and couple one and two are connected with each other through the rotatable bolt (7) and couple one and two eccentric bolt (7) and are connected with each other, the hook I (7) is provided with a torsion spring (8), the other end of the torsion spring (8) is fixed on the conductive contact finger (9), the hook head of the hook I (7) is hooked with the hook plate (13), the other end of the hook II (6) is connected with the upper end of the pull rod (5), the lower end of the pull rod (5) is connected with a limiting pin (11), the limiting pin (11) is fixedly arranged on the hoop (2), the fixed plate (3) is provided with a groove, the limiting pin (11) can move in the groove of the fixed plate (3), in a closing state, the hook head of the hook I (7) is positioned at the inner side of the hook plate (13) to form a hooking lock catch, and is fixed at a locking position through the torsion force of the torsion spring (8) arranged on the hook I (7), when the rotating shaft (1) rotates, the rotating shaft (2) is driven to rotate, the limiting pin (11) moves along with the rotation of the hoop (2), when the limiting pin (11) moves in the groove of the fixed plate (3) and does not contact with the fixed plate (3), the hook I (7) is driven to move along with the rotation of the fixed plate (3), the hook II is not driven to move, and the hook I (7) is released from the movement, and the movement of the hook (3 is not contacted with the fixed plate (3) is released, after the limiting pin (11) moves in the groove of the fixed plate (3) and contacts with the fixed plate (3), the limiting pin (11) continues to move to drive the fixed plate (3) to rotate, and the grounding knife tube (4) is driven to rotate until the grounding knife tube is separated from the fixed contact (12) to complete the brake separating action.

2. The straight-swinging type grounding switch with the closing self-locking function according to claim 1, wherein the grounding knife tube (4) is a high-strength aluminum alloy square tube, the conductive contact finger (9) is of an external pressure type spring structure, and a silver plating layer is arranged at a conductive contact position of the conductive contact finger (9) and the static contact (12).