KR101150330B1 - Motor control center - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor control center, and in particular, the control unit can be pulled out of the cabinet only when the breaker is powered off, and the door of the control unit can be opened. It is to provide a power shield type automatic connection motor control center that can prevent accidents.
To this end, the present invention comprises a cabinet provided with primary to tertiary side converters and female screws; The breaker is mounted to be pulled out of the cabinet and is connected to the primary side to tertiary side converters and the breaker is turned on / off according to the rotation of the screw bar and the lever coupled to the female screw. A control unit; Disclosed is a power shield type automatic connection motor control center including a locking mechanism for controlling rotation of the screw bar according to a lever operation of the breaker to prevent the control unit from being drawn out of the cabinet.

Description

Power shield type automatic connection motor control center {Motor control center}

The present invention relates to a motor control panel, and more particularly, it is possible to take out a control unit from a cabinet only when the breaker is powered off, and to open a door of the control unit, thereby preventing safety accidents such as electric shock during various tests and maintenance. It is about the power control type automatic connection motor control center which can be prevented.

In general, the Motor Control Center (MCC) safely controls and protects motors and related load devices installed in various industrial facilities or plants, distributes low voltage electricity supplied from transformers to the motors, and monitors the flow of overcurrent. It performs a function such as blocking.

Figure 1 shows an example of such a motor control panel (MCC), including the circuit breaker 270 for switching the main circuit power on / off, voltage drop and current transformer, circuit switch, relay, fuse, timer, EOCR, magnetic contactor The control unit 200 equipped with various electric motor control parts such as the unit circuits is housed in a multi-layer cabinet 100 so as to be able to be pulled out.

And the rear of the control unit 200 and the rear of the cabinet 100, the primary connector 210 and the vertical bus bar 110 for power supply, the secondary jack 220 and plug 120 for power output, The tertiary jack 230 and the plug 130 for signal transmission are electrically connected to each other.

Accordingly, when the control unit 200 is pulled forward of the cabinet 100, the primary connector 210 is removed from the cabinet 100 and the bus bar 110 is separated from the bus bar 110 while being pulled out of the cabinet 100. And plug 120 is also separated to be able to perform various tests or maintenance work.

However, such a conventional motor control panel is inadvertently maintained by the operator during the maintenance or inspection process due to the characteristics that the primary side to the tertiary side are electrically connected and disconnected according to the position where the control unit 200 is inserted or removed from the cabinet 100. When the control unit 200 is not drawn out completely or the door 290 is opened without a power cut, and the test is performed, there is a high risk of electric safety accidents such as a short circuit or an electric shock. Due to this, there is a limit that a considerable difficulty in maintenance and replacement of parts is required.

Accordingly, the present inventors have been working hard to develop an electric motor control panel (MCC) that is easy to operate while ensuring safety by preventing electrical accidents during maintenance and the like by focusing on the above-mentioned matters and problem solving. The present invention has been made and completed.

It is therefore an object of the present invention to provide a power shield type automatic connection motor control center that allows the control unit to be drawn out of the cabinet only when the power is cut off.

Another object of the present invention is to provide a power shield type automatic connection motor control center that allows the door of the control unit to be opened only when the power is cut off.

In order to achieve the above object, the present invention includes a cabinet provided with primary and tertiary side converters and female screws; The breaker is mounted to be pulled out of the cabinet and is connected to the primary side to tertiary side converters and the breaker is turned on / off according to the rotation of the screw bar and the lever coupled to the female screw. A control unit; It provides a power shield type automatic connection motor control center including a locking mechanism for controlling the rotation of the screw bar according to the lever operation of the breaker to prevent the control unit from being drawn out of the cabinet.

In addition, the locking mechanism of the present invention, coupled to the screw bar and the locking fastener portion to rotate together; Provided is a power shield type automatic connection motor control center including a latch portion that causes contact interference with or releases the interference with the lock portion in conjunction with the rotation of the lever.

In addition, the locking clasp portion of the present invention, the latch groove is formed in a portion of the outer peripheral surface, the latch portion, the first link member is fixed on the rotation shaft of the breaker lever; A second link member for converting the rotational movement of the first link member into a forward and backward movement; A slider having one end coupled to the second link member and sliding along the rotation of the first link member, the slider having the other end inserted into and released from the latch groove; It provides a power shield type automatic connection motor control center including a guide block for guiding the sliding movement of the slider.

In addition, the front of the control unit of the present invention is provided with a swing-type door, the bottom surface is formed with a slit to insert the rim of the locking portion, the locking portion is coupled and separated from the screw bar in accordance with the opening and closing of the door. A power shield type automatic connection motor control center having an interference prevention surface for preventing contact interference with the slit is provided on a portion of the outer peripheral surface thereof.

According to the present invention having the above-described problem solving means and configuration, the screw bar coupled to correspond to the arm screw fixed to the cabinet and gradually withdrawing the control unit from the cabinet according to the rotation operation is provided only when the breaker is powered off by the locking mechanism. Since it is rotatable, electrical safety is ensured to prevent safety accidents such as short circuits and electric shocks during various tests and maintenance, and thus, worker's psychological anxiety is naturally resolved, thereby improving work efficiency.

In addition, the present invention is easy to operate for various inspection because the control unit can open the door only when the power supply of the circuit breaker is turned off, the primary side and the secondary side are not connected, and the tertiary side moves to the test position of the connected state. Ease and safety of work can be secured and improved.

1 is a plan view schematically showing a conventional motor control panel (MCC),
2 is an overall configuration diagram schematically showing a motor control center according to an embodiment of the present invention;
3 and 4 is a front and rear perspective view schematically showing a control unit of the motor control center according to an embodiment of the present invention,
5 is a perspective view showing the main parts of the control unit and the locking mechanism of the motor control center according to an embodiment of the present invention,
6 to 8 are a front view and a plan view showing an operating state of the locking mechanism of the motor control center according to an embodiment of the present invention,

Hereinafter, embodiments according to the present invention will be described more specifically with reference to the accompanying drawings.

Prior to this, terms to be described below are defined in consideration of functions in the present invention, and it should be understood that they should be interpreted as meanings commonly used in the technical field and concept corresponding to the technical idea of the present invention.

In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention.

2 is an overall configuration diagram schematically showing a motor control center according to an embodiment of the present invention, Figures 3 and 4 are a front and rear perspective view schematically showing a control unit of the present invention, Figure 5 is a control of the present invention It is a perspective view which shows the principal part of a unit and a locking mechanism.

As shown in Figure 2 to 5, the power shield type automatic connection motor control center according to an embodiment of the present invention is roughly divided into a cabinet 10, a control unit 20 and the locking port 30, including It is composed.

First, the cabinet (10) is composed of a box-shaped enclosure that combines a plurality of frames and plates to form the exterior of the motor control center, the front is a multi-storey storage space for accommodating several control units 20 It is divided and has a primary side converter section that receives power from the outside, a secondary side converter section that is a load for outputting power, and a tertiary side converter section that transmits a signal. An insulating wall 19 made of an insulating material such as synthetic resin is mounted between the unit 10a and the storage space of the control unit 20.

The nut screw arm 15 is fixed to the bottom surface of the space in which the control unit 20 is accommodated, and rails and rollers are mounted on both sides so that the control unit 20 can be quickly and easily inserted or removed. have.

Here, the primary side to tertiary side converters 10a and the primary side to tertiary side terminals 21/22/23 of the control unit 20 to be described later are provided in the form of a detachable female / male connector connected to the busbar and insulated. It is electrically connected with the wall 19 in between. That is, the insulating wall 19 not only prevents direct contact between the primary side converter and the primary terminal 21 of the control unit 20, but also maintains and maintains various components embedded in the control unit 20. This prevents the operator from coming into contact with the primary converter where high current flows.

The control unit 20 is installed in the cabinet 10 so as to be inserted and withdrawn in a drawer type, and receives and converts three-phase power through the primary converter, and then outputs power to the secondary converter and transmits signals to the third converter. To perform a normal function, it consists of a hexahedral form having a bottom plate and side plates on all sides.

Inside the control unit 20, an electronic switch for preventing the opening and closing of the motor circuit and an overload, a magnet for switching, a circuit breaker 27 for opening or closing the connection between the power supply side and the load side, etc. when an abnormality occurs in the motor circuit. Various motor control circuit components such as measuring instruments for measuring the current and voltage of the motor are installed. The control unit 20 is coupled to correspond to the arm screw 15 of the cabinet to maintain the locked and unlocked state according to the rotation direction. A screw bar 25 is mounted to enable stepwise insertion and withdrawal from the cabinet 10.

In addition, the front of the control unit 20 is provided with a door 29 that is opened and closed in a hinged manner by the hinge coupling, the front of the door 29 is a rotary lever for operating the on / off of the locking device and the breaker ( 27a) and a wrench groove 25a for rotating the screw bar 25 using a tool such as a hexagon wrench, and a handle for easy and convenient operation of putting in or taking out the cabinet 10. The primary side to tertiary side terminals 21/22/23 connected to the secondary side to tertiary side converter sections 10a are mounted to protrude rearward.

Here, the lever 27a and the wrench groove 25a of the breaker are attached to the door 29 so as to be separated from the respective rotation shafts 27b and the screw bars 25 when the door 29 is opened.

In addition, both sides of the control unit 20 are provided with rollers and rails corresponding to the rails and rollers of the cabinet 10 so as to quickly and smoothly perform the operation in the cabinet 10 or out of the cabinet. A slit 24 is formed in the door to cause the door 29 to be freely opened by causing contact interference with the edge of the clamping portion 31 of the locking mechanism described later.

On the other hand, the arm screw 15 of the cabinet and the screw bar 25 of the control unit are coupled to each other in a screwed manner so that the control unit 20 in the cabinet 10 in accordance with the rotation angle and direction control of the screw bar 25 As it is withdrawn, it is positioned step by step at the connection position, test position and disconnection position. That is, when the screw bar 25 is rotated by a predetermined angle from the outside through the wrench groove 25a, the rotational movement of the screw bar 25 is converted into a linear motion by the female screw 15, and the control unit equipped with the screw bar ( 20) at the same time, the primary and secondary converter and the primary and secondary terminals (21/22) are separated, the tertiary converter and the tertiary terminal (23) to maintain the connection state The on / off of the motor as well as various other functions can be reliably checked.

Thereafter, when the screw bar 25 is further rotated by a predetermined angle, the primary side to tertiary side converters 10a and the primary side to tertiary side terminals 21/22/23 are separated and disconnected from each other to be controlled by the cabinet 10. The unit 20 can be pulled out completely. On the contrary, when the screw bar 25 is rotated, the control unit 20 moves to the original position so that the primary side to tertiary side converters 10a and the primary side to tertiary side terminals ( 21/22/23) are connected to each other.

The locking tool 30 prevents the control unit 20 from being freely drawn out of the cabinet 30 and is provided to control the rotation of the screw bar 25 in accordance with the rotation operation of the breaker lever 27a.

Here, the locking tool 30 is coupled to the screw bar 25, as shown in Figures 6 to 8, rotated together and the lobe type 32 is formed with a latch groove 32 in the 'b' shape on a portion of the outer peripheral surface or The disc shaped clasp 31 and the clasp 35 which generate | occur | produce or contact interference with the clasp 31 with the rotation of the breaker lever 27a are comprised.

And the clasp 31 is mounted on the inner side of the door 29 to be fitted to the screw bar 25 or to be easily separated from the screw bar 25 in accordance with the opening and closing of the door 29, a part of the edge is controlled Is inserted into the slit 24 formed on the bottom surface of the unit to control the opening and closing of the door 29, the slit formed in the control unit according to the rotational position of the screw bar 25 on the part of the outer peripheral surface opposite the latch groove 32 In order to prevent contact interference with the 24, an interference prevention surface 33 having a shape parallel to the bottom surface of the control unit 20 is formed.

In addition, the latch portion 35 is fixed on the rotating shaft 27b of the breaker lever to simultaneously rotate the first link member 36 and the rotational movement of the first link member 36 to forward and backward movement. A second link member 37 having one end coupled to the first link member 36 via a pin and a long hole so as to rotate and linearly move, and a central portion thereof rotatably pinned to the support bracket 37a; One end of the link member 37 and the pin is coupled to the slider 38 slides along the rotation of the first link member 36, the other end is inserted into the latch groove 32, the slider 38, the sliding of the slider 38 It may be configured to include a guide block 39 for guiding the exercise.

In addition, a guide protrusion 38a may be formed on the upper surface of the slider 38 for a more stable sliding motion, and a guide groove 39a may be formed on the upper surface of the guide block 39.

On the other hand, the rotating shaft 27b of the breaker lever and the front end of the screw bar 25 have a polygonal cross section in order to prevent the first link member 36 and the clamping portion 31 coupled to each of the breakers lever from turning when rotating. Correspondingly, the bosses of the first link member 36 and the clamping portion 31 are also preferably polygonal.

Referring to Figures 6 to 8 the operation and operation of the power shield type automatic connection motor control center according to an embodiment of the present invention configured as described above are as follows.

First, as shown in FIG. 6, in the state where the operation lever 27a of the breaker is in the power-on state, the end of the slider 38 of the latch portion is inserted into the latch groove 32 of the clamping portion to restrain the clamping portion 31. Maintaining the state prevents the locking of the screw bar 25 to which the clamping portion is coupled. That is, since the contact interference occurs between the fastener portion 31 coupled to the screwbar 25 and the slider 38 of the catch portion, the screw bar 25 is not freely rotated. 25) and the fastening state of the female screw 15 is maintained so that the control unit 20 can not be withdrawn from the cabinet (10).

In addition, since the edge of the clamping portion 31 is kept inserted into the slit 24 of the control unit, the door 29 of the control unit to which the clamping portion 31 is mounted is also not opened.

As shown in FIG. 7, when the lever 27a of the circuit breaker is rotated counterclockwise to be positioned at the power off state, the latch groove 32 interlocks the end of the slider 38 while the latch 35 is interlocked. When the screw bar 25 is rotated by a certain angle in the clockwise direction, the screw screw 25 is rotated by a predetermined angle so that the screw screw 25 is loosened and the linear state is released. As a result, the control unit 20 moves forward and is naturally drawn out of the cabinet 10.

In this process, the primary and secondary converters and the primary and secondary terminals (21/22) are connected in the form of male / male connectors so that they are naturally separated, and the tertiary converter and the tertiary terminals are connected. Therefore, various functions can be safely checked and repaired while the main power is cut off.

In addition, as shown in FIG. 8, when the screw bar 25 is rotated so that the interfering surface 33 of the clasp portion is horizontally positioned with respect to the bottom surface of the control unit 20, the clasp portion 31 and the control are controlled. Since the interference between the slits 24 formed on the bottom surface of the unit does not occur to release the lock state, the door 29 can be easily opened, and the various types mounted inside the control unit 20 in the state where the main power is cut off. This makes it easier to test or replace the operating condition of parts and the like.

Therefore, the motor control center of the present invention can significantly remove the cause of the electric accident and greatly improve the safety of the work by blocking and shielding the withdrawal or electrical contact of the control unit 20 in the state that the power is applied.

On the other hand, after the inspection and maintenance is completed, close the door 29 and rotate the screw bar 25 counterclockwise to rotate the lever 27a of the circuit breaker while the control unit 20 is inserted into the cabinet 10. When the rotational direction is placed on the power supply, the latch portion 35 is interlocked and the end portion of the slider 38 is inserted into the latch groove 32 of the clamping portion to maintain the restrained state of the clamping portion 31. At the same time, the opening and closing of the door 29 can be restrained by contact interference between the clamping portion 31 and the slit 24.

On the other hand, the present invention is not limited by the above-described embodiment and the accompanying drawings, and can be changed to other embodiments equivalent to substitutions and equivalents within the scope without departing from the spirit of the present invention is common in the art It will be apparent to those who have knowledge.

10: cabinet
10a: converter
15: Armscrew
19: insulation wall
20: control unit
21: Primary terminal
22: secondary terminal
23: tertiary side terminal
24: slit
25: screw bar
25a: wrench groove
27: breaker
27a: lever
27b: axis of rotation
29: door
30: locking ball
31: clasp
32: latch groove
33: anti-interference surface
35: clasp
36: first link member
37: second link member
37a: support bracket
38: slider
38a: Guide protrusion
39: guide block
39a: Home

Claims (4)

A cabinet having primary to tertiary side converters and female screws;
The first side to the third side terminal and the breaker is turned on / off according to the rotation of the screw bar and the lever coupled to the female screw, the first side to the third side terminal connected to the primary side to the tertiary side converter, the drawer is retractable A control unit;
A locking mechanism for controlling the rotation of the screw bar according to a lever operation of the breaker to prevent the control unit from being drawn out of the cabinet;
To include, the locking mechanism,
A fastening part coupled to the screw bar and rotating together;
A latch portion that causes contact interference with or releases the interference from the latching portion in conjunction with the rotation of the lever;
Power shield type automatic connection motor control center comprising a.
delete The method of claim 1,
The fastener portion, the latch groove is formed in a portion of the outer peripheral surface,
The latch portion, the first link member is fixed on the rotation shaft of the breaker lever;
A second link member for converting the rotational movement of the first link member into a forward and backward movement;
A slider having one end coupled to the second link member and sliding along the rotation of the first link member, the slider having the other end inserted into and released from the latch groove;
A guide block for guiding a sliding movement of the slider;
Power connection type automatic connection motor control center including a.
The method according to claim 1 or 3,
A front door of the control unit is provided with a swing-type door, a bottom surface is formed with a slit to insert the rim of the locking portion, the locking portion is provided to be coupled and separated from the screw bar in accordance with the opening and closing of the door, the outside Power shield type automatic connection motor control center, characterized in that the interference prevention surface for preventing contact interference with the slit formed in a portion of the peripheral surface.

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