CN111048335A

CN111048335A - Forced interlocking device

Info

Publication number: CN111048335A
Application number: CN201911285903.8A
Authority: CN
Inventors: 张佳飞; 顾晓冬; 杨龙武; 邵伟清
Original assignee: Shanghai Pinggao Tianling Switch Co ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Current assignee: Shanghai Pinggao Tianling Switch Co ltd; State Grid Corp of China SGCC; Pinggao Group Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-04-21

Abstract

The invention discloses a forced interlocking device, which is characterized by comprising the following components: the device comprises a rack, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth; a support frame is arranged at the lower part of the machine frame, and a through hole is formed in the support frame; a pin shaft movably penetrates through the through hole of the support frame; an elastic reset device is sleeved at the upper end of the pin shaft, the upper end of the pin shaft is tangent to the cam, the pin shaft is driven to move up and down in the through hole through the rotation of the cam, the bottom end of the pin shaft is separated from or tightly presses the cable chamber door plate, and therefore the cable chamber door is unlocked or locked.

Description

Forced interlocking device

Technical Field

The invention relates to the field of ring main unit manufacturing, in particular to a forced interlocking device suitable for gas insulated switchgear.

Background

With the increasing popularity of the user market for the totally-enclosed gas-filled cabinets which are highly reliable, maintenance-free and free from environmental influence, the market share of the distribution network system is increased year by year, and it is also very important to reduce the operation failure in the period and effectively protect the construction safety of constructors.

At present, a ring main unit product in operation is still operated by manpower, which means that the hidden trouble of an accident of contacting a charged part caused by misoperation exists in the operation process.

According to incomplete statistics, 90% of equipment faults all occur at the cable lap joint part, and due to certain errors existing in factory design and national standards of cables and cable sleeves or due to the fact that strict process control is not carried out when cable accessories are installed, local high temperature is caused due to poor contact, and the cable accessories are burnt seriously. And provides a severe test for the continuity of product operation and the safety of field personnel.

Disclosure of Invention

In order to overcome the above-mentioned defects of the prior art, the present invention provides a positive interlock device, so that an operator cannot open a cable chamber door of a gas insulated switchgear under a positive interlock condition, thereby preventing the operator from directly contacting a live part.

In order to realize the purpose of the invention, the adopted technical scheme is as follows:

a positive interlock device comprising:

the indicating device comprises an indicating rod and a cam connected with one end of the indicating rod;

a support frame is arranged at the lower part of the machine frame, and a through hole is formed in the support frame;

a pin shaft movably penetrates through the through hole of the support frame; an elastic reset device is sleeved at the upper end of the pin shaft, the upper end of the pin shaft is tangent to the cam, the pin shaft is driven to move up and down in the through hole through the rotation of the cam, the bottom end of the pin shaft is separated from or tightly presses the cable chamber door plate, and therefore the cable chamber door is unlocked or locked.

In a preferred embodiment of the present invention, the rack includes a first vertical support rod and a second vertical support rod which are oppositely disposed, bottoms of the first vertical support rod and the second vertical support rod are fixed in the cable chamber door panel, two sides of the support frame are respectively disposed with a first support hole and a second support hole, and the first vertical support rod and the second vertical support rod respectively penetrate through the first support hole and the second support hole.

In a preferred embodiment of the invention, the upper end of the first vertical support rod is provided with an upper support frame, and the indicating device is movably arranged on the upper support frame through the indicating rod.

In a preferred embodiment of the present invention, the pin has an up-and-down displacement in a range of 6-8 mm.

In a preferred embodiment of the present invention, the elastic restoring device includes a restoring spring sleeved on the upper end of the pin shaft and an elastic pin for controlling the restoring spring.

The invention has the beneficial effects that:

the structure of the invention ensures that the operation of the cable chamber door can be carried out only when the operating personnel moves upwards and the cable chamber door is separated from the limit of the pin shaft when the operating personnel is at the grounding position, namely the cable side grounding position, thereby effectively improving the operation safety factor of the operating personnel.

Drawings

Fig. 1 is a schematic structural view (latch) of the present invention.

Fig. 2 is a schematic structural view (unlocked) of the present invention.

Detailed Description

The positive-locking device 100 shown in fig. 1 or 2 includes a frame 110 fixed to a cable compartment door panel 210 of a gas-insulated switchgear 200.

The rack 110 includes

vertical support rods

111 and 112 that are opened in opposite directions, and

bottoms

111a and 112a of the

vertical support rods

111 and 112 are fixed in the cable chamber door panel 210.

Support holes 121a and 122a are respectively formed in two

sides

121 and 122 of the support frame 120, and the

vertical support rods

111 and 112 respectively penetrate through the support holes 121a and 122a to fix the support frame 120 on the rack 110.

An upper support bracket 130 for mounting an indicating device 140 thereon is further installed at the upper end 111b of the vertical support bar 111.

The indicating device 140 is interlocked with the mechanism output shaft 210 of the gas insulated switchgear 200, and the indicating device 140 includes an indicating lever 141 and a cam 142 connected to an end 141a of the indicating lever 141.

The indicating device 140 is movably mounted on the upper supporting frame 130 through an indicating rod 141.

In addition, a through hole 123 is formed in the middle of the support frame 120, and the pin shaft 150 movably penetrates through the through hole 123 of the support frame 120; the upper end 151 of the pin 150 is sleeved with an elastic resetting device 160.

The elastic restoring means 160 includes a restoring spring 161 fitted over the upper end 151 of the pin 150 and an elastic pin 162 for controlling the restoring spring 161.

The top of the upper end 151 of the pin shaft 150 is tangent to the periphery of the cam 142, and the pin shaft 150 is driven to move up and down in the through hole 123 by the rotation of the cam 142, so that the bottom end 152 of the pin shaft 150 is separated from or presses the cable chamber door panel 210, and the cable chamber door 210a is unlocked or locked.

Due to space constraints, pin 150 is typically designed to be 6-8mm, which is sufficient for latching cable chamber door 210 a.

When the indication rod 141 of the indication device 140 is in the open or close position, there is a possibility that voltage still exists on the cable side, and if the cable chamber door 210a is opened to contact the cable accessory, there is a possibility that an electric shock risk occurs due to the induced voltage, and even a personal accident occurs due to the insulation aging or local defect of the cable.

When the indication lever 141 of the indication device 140 is in the ground position, the cable side is also in the ground position at the same time, and the cable chamber door 210a is opened without any accident risk.

The main principle of the invention is as follows:

by applying the invention, under the condition of forced interlocking, an operator cannot open the cable chamber door under the charged state of the cable side, so that the cable is prevented from further contacting the charged part of the cable. Personnel's safety has been guaranteed to a certain extent, when needs overhaul cable chamber inside, realizes cable side ground connection through operating device itself, but unblock and open cable chamber door. The simple and ingenious interlocking device greatly improves the reliability of product operation. The situation that personnel directly contact with the electrified part is avoided.

Claims

1. A positive interlock device, comprising:

the device comprises a rack, a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth;

2. The positive locking device according to claim 1, wherein the frame comprises a first vertical support rod and a second vertical support rod which are oppositely arranged, the bottoms of the first vertical support rod and the second vertical support rod are fixed in the door plate of the cable chamber, a first support hole and a second support hole are respectively arranged on two sides of the support frame, and the first vertical support rod and the second vertical support rod respectively penetrate through the first support hole and the second support hole.

3. A positive interlock device as claimed in claim 1, wherein an upper support bracket is mounted to the upper end of the first vertical support bar, and the indicating means is movably mounted to the upper support bracket by means of an indicating bar.

4. A positive locking device according to claim 1, wherein the pin has an up and down displacement in the range of 6-8 mm.

5. A positive interlock as claimed in claim 1, wherein the resilient return means comprises a return spring fitted over the upper end of the pin and a resilient pin for controlling the return spring.