CN108206106B

CN108206106B - Improved locking mode device for switch safety lock

Info

Publication number: CN108206106B
Application number: CN201611168350.4A
Authority: CN
Inventors: 陈锡瑜; 陈建一
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2020-03-10
Anticipated expiration: 2036-12-16
Also published as: CN108206106A

Abstract

The invention discloses a device for improving the locking mode of a switch safety lock, which is used for locking a circuit breaker and comprises a locking device and a fixed bottom plate; the fixed bottom plate is fixedly arranged on the circuit breaker, the locking device is arranged on the fixed bottom plate and is provided with a stop lever, a lock, a power input point and an electric bolt, the stop lever is linked with the lock, when a handle of the circuit breaker is in any state of closing, breaking and tripping, the lock is kept at a locking position to lock the circuit breaker, the stop lever is linked with a microswitch and leads out a microswitch signal to an external terminal, the power input point is electrically connected with the electric bolt to control the movement of the stop lever, and the external terminal of the locking device can be electrically connected with the power input point of another locking device. The invention is fixed ON the breaker by the fixed bottom plate, a stop lever is arranged in the locking device and is linked with the lock, when the handle of the breaker is in a closed (ON) or Open (OFF) state, the lock is rotated to a locking position by using a key, and the ON or OFF locking operation can be carried out ON the breaker.

Description

Improved locking mode device for switch safety lock

Technical Field

The present invention relates to an improvement of a switch locking device, and more particularly, to a motor switch locking device capable of improving safety.

Background

Based on the experience of improving industrial safety and on the field, the applicant of the present invention has a series of inventions and creations related to the management of motor switches and power supplies, and the research and development results have been patented and approved in more than ten parts. In particular, the applicant of the present invention has provided a series of practical motor switch locking devices that can be used in combination with various brands and models of motor switches with good results. The applicant of the invention has a series of inventions and creations about the safety of the motor switch, and the invention mainly lacks a practical motor switch locking device in view of the fact that many past electrical accidents at home and abroad occur in the maintenance events of motor machinery. However, the improvement of the locking device applicable to various states is not solved.

The "electrical safety technical data" published in 1999 by the labour safety and health research of taiwan labour committee of taiwan is indicated in the research report conducted by suwenyuan: "the electricity sensing accident is always one of the main causes of the accident injury of the workers, and should be avoided as much as possible to protect the safety of the workers. The main reason for the occurrence of the electricity sensing accident is that the electrical safety is not well known by the public institution and the workers, so that the potential risks such as unsafe environment and unsafe behaviors exist in the working site. "common electrical safety hazards are mainly of two kinds, the first is from mechanical equipment using electricity, and the second is negligence in electrical work. In order to remedy the deficiency of the utility and workers in the recognition of electrical safety and prevent the damage of electrical work, in the forty-fifth item of "safety and sanitation rules for workers", it is further mandatory that the employer must have safety facilities for electrical machinery, i.e. for machinery operating under power, an emergency brake device with a clear mark is provided at a proper position to immediately interrupt power and link with a brake system, so as to quickly stop the operation of machinery in an emergency. In addition, in order to prevent the damage of the work using electricity, in the case of power failure work, the "worker safety and sanitation rule" second fifty-four rules stipulate that the employer should "lock" or mark "power transmission prohibition" and "power failure work" or install a facility monitored by a monitoring person in the work of placing, constructing, inspecting, repairing, painting, etc. the circuit, the circuit holder, or the work near the circuit work after the circuit is opened, and the switch for opening the circuit should be adopted after the circuit is confirmed to be opened. The first type of disaster from mechanical equipment using electricity is caused by the lack of recognition of the principles of electrical safety interruption dynamics by almost most people. Although the "labor safety and sanitation rule" second fifty-four rules further stipulate that the circuit should be "locked" in operation by adopting an open switch, the "locking" rule has been so far always passed through the air and has not been actually implemented.

The shunt switch or circuit breaker for the disconnector is to have a blocking device according to international electrical code nec.422.31.(430.102) (440.14). The isolation device is locked in place within the visual range of the electrical appliance or in the open circuit. The locking mechanism should be in place. The rule principle and the purpose are to prevent power misdelivery and reverse power delivery (under the condition of not influencing public safety!):

1. the private indoor distributor is not locked.

2. Public places need to be locked by electricity.

3. The motor centralized control panel can be locked by using a switch handle.

4. After locking, there is a dangerous situation that the lock is not locked!

The lock device is intended to prevent erroneous power transmission, reverse power transmission …, etc., and may be dangerous because of a condition invisible to the eyes, and therefore, it is desired to lock the lock device at the time of maintenance to ensure safety. In view of this, all manufacturers manufacturing switches in the world have to produce related products. Including the external hanging type, the internal key type … … and the like. Also, there are mandatory regulations and penalties in the United states OSHA, fire code …, etc.

In special places, there are different requirements for switches, for example, in many dangerous places, such as chemical plants, gunpowder storehouses, gas and liquid plants, military facilities …, etc., some electric switches must be closed during power supply, must not be opened by mistake or malfunction, and cause serious loss, such as melting high-temperature and high-pressure liquid in a furnace core, which can cause unrecoverable result, so in some special places, the switch must be locked in a power-ON (closed) state.

In special place environment, some special functions are required, for example, in many unattended rooms, the breaker switch of the machine must prevent the power failure caused by the malfunction of external force in some loops, which causes loss and even accidents. However, in this circuit, when an accident occurs, such as an overload, a fault current, a ground fault …, etc., the circuit breaker must be tripped to avoid damage to the equipment and even a fire! Therefore, the above-mentioned locking device is required to be different from the above-mentioned two states, one is forced to be locked in the ON state and the other is forced to be locked in the OFF state to be opened and closed, and the breaker must be tripped to isolate the accident.

In many cases of an actual power system, there are many situations that two circuit breakers must be mutually locked, that is, the two circuit breakers are interlocked, that is, only one of the two circuit breakers is electrified, and not both of the two circuit breakers are electrified simultaneously, which may cause a short-circuit accident. In the above state, most of the automatic transfer switches (also known as ATS) are used under normal circumstances, but the two automatic transfer switches are generally arranged in parallel on the same case, and the circuit breaker must have the same specification. However, the safety requirement is met only by the electrical and mechanical lock functions.

When three circuit breakers are required to be in a locking state, namely the three circuit breakers are interlocked and interlocked with each other to perform the Tie function, namely the three circuit breakers only allow two circuit breakers to be simultaneously closed to be ON at most, the problem which has been long existed in the past can be solved if the improvement of the switch locking device of the invention can be applied. And because the lock can be mechanically and electrically locked, the absolute reliability of the lock can be improved. And the output of the contact point based on the state is beneficial to identification, and the convenience and the safety of use are improved. The invention also improves the inconvenience and the defect of the patent of the no-fuse switch locking device in the M318184 patent, for example, the mode of only locking the trip position meets the requirement of the locking device which must be locked by power failure during maintenance, but the locking device can not be universally used in the situations with different function requirements. In the prior art, various countries in the world have ON/OFF for locking modes, different modes require different locks and components, and multiple safety lock implementation modes are derived, so that the production cost is increased, the burden ON product management is increased, and the trouble of owners is caused. The above problems have existed for a long time, and domestic and foreign manufacturers have been unable to properly solve the problems to enhance the safety of electrical equipment and operation.

Disclosure of Invention

In order to solve the above problems, it is a primary object of the present invention to provide a switch locking device which has a simple structure and is easy to install, can satisfy all the requirements of various functions, and can prevent malfunction by combining electrical and mechanical aspects, thereby improving safety performance of electrical equipment in use.

[ MEANS FOR SOLVING PROBLEMS ] A method for producing a semiconductor device

In order to achieve the above object, the present invention provides a switch locking device, which must be capable of Locking (LOCK) in all three positions of ON (ON), OFF (OFF) and Trip (Trip), and in order to make circuit breakers interlock with each other to prevent malfunction, in addition to mechanical locking and interlocking functions, an electrical interlock must be added to further avoid malfunction, to ensure compliance with public safety regulations, and to prevent accidents.

In order to achieve the requirement of mechanical locking function, the locking lock can achieve the locking state of multiple positions, the lock needs to have special functions, and can be changed in various combinations, for example, a key rotates to have three positions or two positions, and the lock can be pulled out or not pulled out at each position so as to meet the requirement of various state functions.

In order to achieve the functions of mechanical and electrical locks, the internal interlocking of the lock piece requires the combination of elements of an internal electric bolt interlocking mechanism, so that when the locks are operated, the locks in the electrical and mechanical aspects can achieve the function of internal mutual locking, the internal interlocking mechanism can be operated according to the required state, and the operation cannot generate misoperation even if a spare key appears.

In order to achieve the function of internal electrical actuation, a fixed plate is arranged above the surface of the circuit breaker, a device capable of distinguishing the state position of the circuit breaker can be arranged, three micro switches or two micro switches can be arranged at three state points of ON, OFF and Trip of the circuit breaker, the state of the circuit breaker can be easily identified, and an outgoing line or an external terminal table contact is arranged to facilitate wiring so as to be connected to a locking device of other circuit breakers to be applied to various functions.

In order to meet the stringent requirement of safety, a protection cover is required above the lock device, as in the case of a lens protection device of a general camera, and the operation of the protection cover is controlled by a state electrical point connected with the state positions of a key and a circuit breaker, so as to ensure the lock function. When a person carelessly takes the spare key to operate with the spare key, misoperation can not be generated, so that accidents or safety accidents caused by the misoperation can be avoided, and the requirement of safety can be met.

Since the above locking device has electrical contacts, it is possible to provide a warning sign or a combination of a warning light for indicating the locked state in the locking device. In order to clear the boundary problem of the responsibility points, it is preferable to have a functional contact output, whether transmitted by wire or wireless.

The invention provides a device for improving the locking mode of a switch safety lock, which is used for locking a circuit breaker and comprises a locking device and a fixed bottom plate; the fixed bottom plate is fixedly arranged on the circuit breaker, and the locking device is arranged on the fixed bottom plate; the locking device is internally provided with a stop lever and a lock, the stop lever and the lock can be linked, when a handle of the circuit breaker is in any state of closing, breaking and tripping, the lock is kept in a locking position to lock the circuit breaker, the stop lever is linked with a micro switch and can lead out a signal of the micro switch to an external terminal, the locking device is also provided with a power input point and a power bolt, the power input point is electrically connected with the power bolt, the power bolt is arranged below the stop lever to control the stop lever to move, the external terminal of the locking device can be electrically connected with a power input point on another locking device, and the locking of mechanical property and electrical property is synchronously generated.

Preferably, the locking device comprises a box body, and the stop lever inside the box body is interlocked with the lock to display the locking state or a normal display element when any one of the locking states is closed, opened and tripped, so that the operation state of the switch safety lock can be conveniently inspected.

Preferably, the locking of the internal bar of the lock is controlled by a driving element, and the power supply of the driving element is connected to the power input point of the locking device.

Preferably, the lock is controlled by an inserted key, and the lock is provided with a note point of the pull-out position.

As a preferred technical scheme, the microswitch is arranged behind the fixed bottom plate and is fixed on the circuit breaker in a state of being capable of adjusting displacement and proper distance.

As the preferred technical scheme, the box body and the fixed bottom plate are combined into a cassette box body assembly and fixed on the circuit breaker.

The device for improving the locking mode of the switch safety lock is easy to be fixedly arranged ON a fixed bottom plate of a circuit breaker, a stop lever is arranged in the locking device and linked with a lock, when a handle of the circuit breaker is in a closed (ON) state or an Open (OFF) state, the lock is rotated to a locking position by using a key, the ON or OFF locking operation can be carried out ON the circuit breaker, the stop lever can be linked with a microswitch by different operations relative to the circuit breaker, a microswitch signal can be led out, the microswitch signal can be further electrically connected for functional application, the mechanical and electrical interlocking function is achieved, and the safety of the system is improved.

The invention is easy to be fixed ON the breaker by a fixed bottom plate, and a stop lever is arranged in the locking device and linked with the lock, when the handle of the breaker is in a closed (ON) state or an Open (OFF) state, the lock is rotated to a locking position by using a key, the ON or OFF locking operation can be carried out ON the breaker, and the stop lever can be linked with the microswitch relative to different operations of the breaker, and the microswitch signal can be led out for further electrical connection function application, thereby achieving the function of mechanical and electrical interlocking and improving the safety of the system.

Drawings

FIG. 1 is a schematic view of an embodiment of the improved locking device of the safety lock of the switch of the present invention.

FIG. 2 is a schematic diagram of the improved locking mechanism of the safety lock of the switch of the present invention in the closed position.

FIG. 3 is similar to FIG. 2, but shows a schematic view in the open position.

FIG. 4 is a view similar to FIG. 2 but showing the latch in a latched forced closed position.

FIG. 5 is a schematic diagram of the external appearance of the device with improved locking mode for the safety lock of the switch of the present invention, showing that the device of the present invention is installed above the circuit breaker.

FIG. 6 is an internal structure diagram of the device for improving the locking mode of the safety lock switch according to the present invention, illustrating the relative mechanical and electrical actions of the locking device and showing the locking device in the normal position.

Fig. 7 is similar to fig. 6, but shows the lever restricted from movement.

Fig. 8 and 9 respectively show the locking device of the invention in an external view relating to the mutual linkage of mechanical and electrical structures, fig. 8 is a plan view, and fig. 9 is a perspective view.

Fig. 10 and 11 together show a schematic diagram of the interlocking of the device of the present invention to two circuit breakers.

Fig. 12 and 13 together show the interlocking schematic diagram of the device of the present invention applied to three circuit breakers.

FIG. 14 is a schematic view of a bracket of the device for improving the locking mode of the safety lock of the switch according to the present invention.

FIG. 15 is an assembly view of the improved locking mechanism of the safety lock of the switch of the present invention.

[ notation ] to show

A circuit breaker 10; a handle 11;

a locking device 20; a body 21; a fixed base plate 22;

a lock 23; a shift lever 24; a latching position point 25;

a normal position point 26;

a key 30; a lockout indication 31; a normal indication 32;

an external terminal block 40; a power input point 42;

a lever positioning post 50; an inner power plug 51; an internal position positioning microswitch 53;

the bracket 70 is fixed.

Detailed Description

The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.

The device according to the present invention for improving the locking of a safety lock of a switch is implemented in a preferred embodiment, as shown in fig. 1, in which a locking device 20 is composed of a box-shaped lock body 21 and is combined with a fixed bottom plate 22 and fixedly placed beside a handle 11 of a circuit breaker 10. The handle 11 is shown in the closed ON position of the circuit breaker 10 body, when the key 30 is inserted into the lock 23 and turned counterclockwise to the locked position point 25, when the internal transmission mechanism is actuated to move the lever 24 to the locked position and is shown or marked with the locked indication 31, which is not indicated by the normal indication 32 and which is interlocked with the lever 24 and can be actuated using the internal position positioning microswitch 53 (see fig. 6 and 7). The microswitch signal can be connected to the external terminal block 40 or an outgoing line, so as to be used as a state representation output point of the switch safety lock, and also be used as an electrical control point with other switch safety locks.

The second embodiment of the device for improving the locking mode of the switch safety lock according to the present invention is implemented as shown in fig. 2 and 3. Fig. 2 shows the handle 11 of the circuit breaker 10 flipped up and fig. 3 shows the handle 11 flipped down. In any case, when the locking device 20 is located at the middle position of the circuit breaker 10, and the stop lever 24 is located at the Trip position of the handle 11, the ON locking function is performed, and the OFF locking function is also performed. At this time, the locking indication 31 is displayed, and the common point COM and the normally open NO in the external terminal block 40 are conducted. Conversely, when the key 30 is rotated clockwise to the normal position 26, the internal transmission mechanism is actuated to retract the shift lever 24 into the body 21 of the lock device 20 (not shown), the normal indication 32 is displayed or marked, the lock indication 31 is not displayed, the internal position positioning microswitch 53 is actuated to connect to the external terminal block 40, and the common point COM and the normally closed NC in the terminal block are turned on.

Referring to fig. 4, a third embodiment of the present invention is shown, in which a switch safety lock 20 body 21 is fixed on the side of a handle 11 of a circuit breaker 10. When the key 30 is turned to the locked position 25, the lever 24 is fully pressed against the handle 11 of the circuit breaker 10 when the lever 24 is located directly below the handle 11, i.e., the handle 11 has been pushed up to the circuit breaker ON position. Thus, the function of forced ON can be achieved, even if the line breaks down, the contact inside the breaker 10 is forced to be closed, and the circuit is not cut off, so that the functional requirement of forced non-power-off is met.

Referring to fig. 5, an embodiment of the forced breaker 10 is shown in an OFF or Trip condition. As shown in fig. 5, the switch safety lock locking device 20 may be installed at a position above the movement direction of the handle 11 of the circuit breaker 10. When the key 30 is turned to the locking position 25, the lever 24 is pushed by the handle 11 and cannot be moved upward, so that the circuit breaker 10 cannot be turned ON, and thus the function of forced OFF is achieved, and malfunction is not generated.

Fig. 6 and 7 are internal structural views of the device for improving the locking mode of the switch safety lock according to the present invention, and show the operation diagrams of the inside of the upper lock device 20, the stopper rod 24, the internal power plug 51, and the positioning microswitch 53. Fig. 6 is an internal schematic view of the locking device 20 in the normal position, wherein the key 30 is at the normal position point 26 and the normal indication 32 is displayed on the body 21, wherein the internal position positioning microswitch 53 is connected to the external terminal block 40 of the locking device 20 as shown with the common point COM and the normally open NO being on. A shift lever positioning pin 50 is located below the shift lever 24, and when the internal power plug 51 is not energized to suck down, the shift lever 24 is restricted from moving (as shown in FIG. 7), and when the internal power plug 51 is actuated to suck down, the shift lever 24 is free to move (as shown in FIG. 6). The power of the internal power plug is from the power input point 42 of the locking device 20, and is electrically connected to the internal position positioning micro switch 53 of the locking device 20 of other fingers, and the locking device 20 is electrically connected at the locking position 25, and the gear lever 24 can move freely after the power is supplied. In fig. 7, the locking device 20 is shown in an internal view in the locked position, wherein the key 30 is at the locked position point 25 and the lock indicator 31 is shown on the body 21, wherein the internal position thereof is located at the microswitch 53. The common point COM is connected to the external terminal block 40 of the locking device 20 by being conducted to the normally closed NC, and a first-gear lever positioning pin 50 is provided below the gear lever 24, so that the gear lever 24 is restricted from moving when the internal plug 51 is not energized and is sucked down, and the gear lever 24 can move freely when the internal plug 51 is energized and is sucked down. The power of the internal power plug comes to the power input point 42 of the locking device 20, and is electrically connected to the internal position positioning micro switch 53 of the locking device 20, and when the locking device 20 is at the locking position 25, the power is connected, and the gear lever 24 can move freely after the power is turned on. Fig. 8 and 9 are schematic views of the locking device according to the present invention, wherein the locking device is linked to a mechanical structure and an electrical structure, respectively, and fig. 8 and 9 are schematic views of the locking device according to the present invention, wherein fig. 8 is a plan view and fig. 9 is a perspective view.

Fig. 10 and fig. 11 are schematic diagrams collectively showing the interlocking of the apparatus of the present invention to two circuit breakers, and show a functional application example of the interlocking of two circuit breakers CB1 and CB2 (as shown in fig. 11) in an electric power system. Fig. 10 is a diagram showing a power system, and fig. 11 is a diagram showing an appearance of a circuit breaker equipped with the device of the present invention. When the circuit breaker 10 (CB 1 and CB2, respectively) is described as a single locking device 20, the two locking devices 20 have two locks 23, but only one key 30 is provided on the lock 23 of the locking device body 20, when the key 30 is in the locking position 25, the internal position positioning microswitch 53 is not actuated, so that the common point COM and the common point NC in the external terminal block 40 are conducted, and the two points are electrically connected to the internal power plug 51 of the other locking device 20 to be actuated, so that the transmission mechanism and the stop lever 24 in the other locking device 20 are moved. On the contrary, when the key 30 is at the normal position 26, the internal position positioning micro switch 53 is operated to turn on the common point COM and the normally open NO in the external terminal block 40, the two points are electrically connected to the power input point 42 of the other locking device 20, and the electric bolt 51 in the other locking device 20 is operated to block the transmission mechanism and the stop lever 24 in the other locking device 20 from moving, so as to achieve the function of locking the two circuit breakers 10 CB1 and CB2 with each other.

Fig. 12 and fig. 13 together show a schematic diagram of three circuit breakers CB1, CB2 and CB3 mutually locked in a power system. In the functional application example, fig. 12 is a representation of a power system, and fig. 13 is a representation of the actual appearance of three circuit breakers equipped with the device of the present invention. When the locking devices 20 are added to the three circuit breakers CB1, CB2 and CB3, at most two of the three locking devices 20 can be turned ON, only two keys 30 are arranged ON the three locking devices 20, and the action connection mode of the three locking devices can achieve the required corresponding function like two pairs of locks.

FIG. 14 is a schematic view of a bracket of the device for improving locking mode of a safety lock of a switch of the present invention, and FIG. 15 is a schematic view of the device of the present invention assembled on the bracket. Fig. 14 and 15 show that the main body 21 of the locking device 20, or the fixing bottom plate 22, is made into a cassette or placed on a pair of fixing brackets 70 according to the external dimensions of the circuit breaker 10, which can be flexibly changed according to the actual situation to meet the requirement of practicability. In any event, these are only detailed technical examples that facilitate the installation of the device of the present invention and are not intended to limit the manner in which the device of the present invention may be actually installed.

In summary, the device with improved locking mode of the switch safety lock of the present invention can be locked at various positions, has display function, can solve various applications with special requirements by the internal mechanical structure and the internal control element, and is assisted by the change of the switch position of the external breaker, and has industrial applicability.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.

Claims

1. A device with improved locking mode of switch safety lock is used for locking a circuit breaker and comprises a locking device and a fixed bottom plate; the fixed bottom plate is fixedly arranged on the circuit breaker, and the locking device is arranged on the fixed bottom plate; the locking device is characterized in that a stop lever and a lock are arranged in the locking device, the stop lever and the lock can be linked, when a handle of the circuit breaker is in any one of a closed state, a disconnected state and a trip state, the lock is kept in a locking position, the circuit breaker can be locked, the stop lever is linked with a microswitch, a signal of the microswitch can be led out to an external terminal, the locking device is also provided with a power input point and a power plug, the power input point is electrically connected with the power plug, the power plug is arranged below the stop lever to control the stop lever to move, the external terminal of the locking device can be electrically connected with a power input point on the other locking device, and mechanical and electrical locking is synchronously generated.

2. The improved device of claim 1, wherein the locking device comprises a case, and the stop bar inside the case is linked with the lock to display the locking state or normal display element when the lock is in any one of the closed state, the open state and the trip state, so as to facilitate the inspection of the operation state of the switch safety lock.

3. The improved locking mechanism of switch safety lock as claimed in claim 1, wherein the locking of the internal bar of the lock is controlled by a driving element, the power source of the driving element is connected to the power input point of the locking mechanism.

4. The improved locking mechanism of switch safety lock as recited in claim 1, wherein the lock is controlled by an inserted key and the lock is provided with a mark point of the pull-out position.

5. The apparatus as claimed in claim 1, wherein the micro switch is mounted behind the mounting plate and is mounted on the circuit breaker in a manner that the micro switch can be displaced at a proper distance.

6. The apparatus as claimed in claim 2, wherein the casing and the fixed base plate are combined into a cassette casing assembly to be fixed to the circuit breaker.