KR20180094312A - Cargo crane - Google Patents

Abstract

A cargo crane includes a boom assembly including a first boom fixed to a vehicle, a second boom drawn out and extending in length from the first boom, and a plurality of booms sequentially drawn out and extending in length from the second boom, a boom support disposed at the upper end of the boom assembly and connecting by a wire the first boom and an nth boom (n being a natural number) sequentially drawn out and extending in length from the first boom, an outrigger installed in the vehicle and including a first horizontal section, a second horizontal section drawn out and extending in length from the first horizontal section, a first vertical section connected to the second horizontal section and extending in a vertical direction, and a second vertical section drawn out from the first vertical section and coming into contact with a ground surface, a weight detachably disposed on the outrigger, a bottom portion disposed in the lower portion of the second vertical section, a sensor unit disposed to protrude on the lower surface of the bottom portion and pressed during ground surface contact, and a signal transmission unit transmitting a signal depending on pressing of the sensor unit, and includes a control unit including a fall notification plate detachably installed in the lower portion of the second vertical section, a reception unit installed in the vehicle and receiving the signal transmitted from the signal transmission unit, a fall notification unit operated in accordance with the signal from the reception unit, and an operation control unit stopping an operation of the crane.

Description

Cargo crane {CARGO CRANE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cargo crane, and more particularly, to a cargo crane capable of preventing a cargo crane from turning and preventing a boom from bending.

Generally, work boats, cargo cranes, etc. are used to take out booms, work in a highway, load and unload cargo, and install and maintain facilities. At this time, the work height difference can be easily conducted by the drawn boom, and an apparatus called out trigger is installed in order to compensate it.

However, there is always a risk of overturning when working high car and cargo crane have a high work radius or a wide working radius. Therefore, in order to prevent the overturning of the work truck, the center of gravity of the work truck including the weight of the cargo should be located in the segment connecting the ground points of the outriggers supported on the ground. This center of gravity also has the risk of varying due to winds generated by the wind, which is an environmental factor, due to the salience of the ground supported by the outrigger.

A load limit device may be installed to limit the boom angle depending on the weight of some cargoes. However, this does not involve the center of gravity which is changed by the external environmental factors, although only the geometry of the car is reflected can not do it.

The crane is a mechanical device for lifting the weight up and down and transporting it up and down. There are various types according to the driving method. One of them is a jib crane (jib) which operates by hanging a hook on the end of a boom, crane. However, in the case of such a jib crane, when the weight is heavy, there is a problem that the boom is deformed or damaged by the flexural load.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a cargo crane capable of preventing a cargo crane from being turned off and preventing a boom from being deformed or damaged by a bending load .

The cargo crane according to one embodiment of the present invention for realizing the object of the present invention includes a first boom fixed to a vehicle, a second boom drawn out from the first boom and extending in length, and the second boom drawn out sequentially from the second boom (N is a natural number) boom, which is disposed at the upper end of the boom assembly and is extended sequentially from the first boom and the first boom, A second horizontal portion extending from the first horizontal portion and extending from the first horizontal portion, a first vertical portion connected to the second horizontal portion and extending in the vertical direction, An outrigger including a first vertical portion and a second vertical portion drawn from the first vertical portion and contacting a ground surface; a weight detachably disposed on the outrigger; And a signal transmission unit for transmitting a signal depending on whether the sensor unit is pressed or not, and a signal transmission unit for transmitting a signal according to whether the sensor unit is pressed or not, wherein a detachable type sensor unit is provided at a lower portion of the second vertical unit, And a control unit which is installed in the vehicle and includes a receiving unit for receiving a signal transmitted from the signal transmitting unit, a conduction notification unit for operating according to a signal of the receiving unit, and an operation control unit for stopping the operation of the crane, . The boom support is disposed on the upper end of the first boom, and the winch portion is wound with wires, the winch portion is wound with the extension of the length of the boom assembly, And a wire fixing unit disposed at an upper end of the n-th boom for fixing the end portions of the wires wound on the winch unit.

In one embodiment of the present invention, the weight includes a mount disposed on the upper surface of the first vertical portion, a body connected to the mount, a first fixing portion disposed on the upper end of the body and extending in the horizontal direction, And a second fixing part disposed at a lower end of the body part and having the same shape as the first fixing part.

In an embodiment of the present invention, the space defined by the mounting part and the body part may correspond to the shape of the first vertical part.

In an embodiment of the present invention, the first fixing portion may include a first support portion disposed on one side of the body portion and protruding from the body portion, a first end connected to the first support portion, And a second fixing hole formed at a second end opposite to the first end, and a second fixing hole disposed on the other side of the body and having the same shape as the first fixing hole, And a fixing pin passing through the first fixing hole and the second fixing hole and fixing the second end of the fixing bar and the second supporting portion.

In one embodiment of the present invention, the weight includes a first mounting portion disposed on the upper surface of the first vertical portion and having a first thickness, a second mounting portion disposed on the upper surface of the second horizontal portion, A first fixing part disposed at a lower end of the body part positioned at a lower end of the second mounting part and extending in a horizontal direction, and a second fixing part disposed at a lower end of the second mounting part, And a second fixing part disposed adjacent to the first fixing part and having the same shape as the first fixing part.

In an embodiment of the present invention, the space defined by the first mounting portion, the second mounting portion, and the body may correspond to the shapes of the first vertical portion and the second horizontal portion.

In one embodiment of the present invention, the conduction notification plate includes a first sidewall portion protruding in a vertical direction from the bottom portion, a second sidewall portion protruding inward from the first sidewall portion, a second sidewall portion extending through the second sidewall portion A fixing part which is provided at a lower end of the fixing bar and which is disposed on an upper end of the fixing bar and which rotates the fixing bar; And a groove portion formed on a bottom surface of the bottom portion, the groove portion receiving the sensor portion.

In one embodiment of the present invention, the weight may have a weight of 3 to 5 tons.

According to the present invention, the boom assembly includes a boom support disposed at the top thereof. Therefore, when the boom assembly is bent due to its heavy weight, the wire can be quickly cut out from the winch portion, but in this case, the wire can be prevented from rotating within the winch portion. As a result, the boom of the boom assembly is supported by the wire, so that the boom can be prevented from being bent.

Further, since the detachable weight is disposed on the opposite outrigger that performs the work, it is possible to prevent the crane from being conducted due to the weight weight.

In addition, a conduction notification plate is provided below the second vertical portion of the outrigger. It is judged that there is no danger of conduction when the sensor part is pressed and the outrigger is floated on the ground when the pressed sensor part is projected again so that it can be judged that the danger of conduction is increased. Accordingly, in this case, a signal indicating the danger of conduction is transmitted, and when the conduction notification unit operates, the operation control unit can be controlled to stop the operation, thereby preventing the crane from being turned off.

1 is a side view showing a cargo crane according to an embodiment of the present invention.
2 is a top view of a boom support according to an embodiment of the present invention.
3 and 4 are views showing the inside of a winch portion of a boom support according to an embodiment of the present invention.
5 is a side view showing a state where a weight is attached to an outrigger according to an embodiment of the present invention;
6 is a side view showing the weight of Fig.
7 is a front view showing the weight of Fig.
Fig. 8 is a view showing a state in which the first fixing portion of the weight of Fig. 5 is engaged. Fig.
Fig. 9 is a view showing a state in which the first fixing portion of the weight of Fig. 5 is separated. Fig.
10 is a side view showing a state where a weight is attached to an outrigger according to an embodiment of the present invention.
11 is a side view showing the weight of Fig.
12 is a front view showing the weight of Fig.
FIG. 13 is a cross-sectional view illustrating a state in which a conductive billboard is fastened to a second vertical portion according to an embodiment of the present invention. FIG.
FIG. 14 is a bottom view of a conduction notification board according to an embodiment of the present invention. FIG.
15 is a block diagram illustrating a conduction notification board and a control unit according to an embodiment of the present invention.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.

The terms are used only for the purpose of distinguishing one component from another. The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the term "comprises" or "comprising ", etc. is intended to specify that there is a stated feature, figure, step, operation, component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

1 is a side view showing a cargo crane according to an embodiment of the present invention. 2 is a top view of a boom support according to an embodiment of the present invention. 3 and 4 are views showing the inside of a winch portion of a boom support according to an embodiment of the present invention.

1 to 4, a cargo crane according to an embodiment of the present invention includes a boom assembly 100, an outrigger 200, an equipment cockpit 300, a loading box 400, and a boom support 500 can do.

The boom assembly 100 includes a first boom 110 fixed to a vehicle, a second boom 120 drawn out from the first boom and extending in length, and a plurality of Boom. ≪ / RTI >

The boom support 500 is disposed at the upper end of the boom assembly and includes an n-th (n is a natural number) boom 130 that is extended from the first boom 110 and the first boom 110, ) With a wire (510).

The boom support 500 is disposed at an upper end of the first boom 110 and is wound with wires 510. The wire 510 is pulled out along with the extension of the boom assembly, A pulley portion 540 disposed on the upper end of the second boom 120 to the (n-1) th boom and guiding the wire, And a wire fixing portion 560 for fixing the end portion of the wire wound on the winch portion 530. The winch portion 530 is fixed on the first boom 110 by the winch support portion 520 and the pulley portion 540 is fixed on the second boom 120 by the pulley support portion 550 The wire fixing part 560 may be fixed to the upper end of the n-th boom 130 by the fixing part supporting part 570.

The inside of the winch portion 530 may have a structure as shown in FIGS.

One side of the spool 10 is provided with a locking unit of a retractor which is provided with an external gear 19 on its outer side and an inner rotation center 70 and a diagonal shaft 32, (30). The locking arm 30 is provided with a protruding locking portion, and a front stopper 12 and a rear stopper 14 are provided so that the locking portion can move. The other end of the locking arm 30 is caught by the other stopper 16 and is supported by a spring 18 and an inertial actuating part 50 is provided to prevent rotation of the supply release locking arm of the wire 510. The inner gear 92 is fixed to the housing 90 so that the locking portion of the locking arm 30 is caught by the inertia. The inner gear 92 is fixed to the housing 90, Is rotated inside the housing 90 and the internal gear 92 is fixed and stopped without rotating

If the weight carried by the boom assembly 100 of the crane is heavy, the boom may be bent or broken due to the flexural load. However, the boom assembly 100 according to one embodiment of the present invention includes a boom support 500 disposed at the top thereof. Accordingly, when the boom assembly is bent due to heavy weight, the wire can be quickly cut out from the winch portion 530, but in this case, the rotation of the feed release locking arm of the wire 510 inside the winch portion 530 It prevents you. As a result, the wire is supported by the n-th boom 130 of the boom assembly 100, so that the boom can be prevented from being bent.

The equipment cockpit 300 may include a driver's seat 310 and a control unit 320. A weight 600 and a conduction notification board 700 may be mounted on the loading box 400.

5 is a side view showing a state where a weight is attached to an outrigger according to an embodiment of the present invention; 6 is a side view showing the weight of Fig. 7 is a front view showing the weight of Fig. Fig. 8 is a view showing a state in which the first fixing portion of the weight of Fig. 5 is engaged. Fig. Fig. 9 is a view showing a state in which the first fixing portion of the weight of Fig. 5 is separated. Fig.

5 through 9, an outrigger according to an embodiment of the present invention includes a first horizontal part 220, a second horizontal part 230, a first vertical part 210, and a second vertical part 240 ).

The first horizontal part 220 may be installed in the vehicle, and the second horizontal part 230 may be extended from the first horizontal part 220. The first vertical part 210 is connected to the second horizontal part 230 and extends in the vertical direction. The second vertical portion 240 may be drawn out from the first vertical portion 210 and contact the ground.

The weight 600 may be removably disposed in the outrigger. The weight 600 may be formed with a weight of 3 to 5 tons. The weight 600 may be normally stored in the loading box 400 of the vehicle.

The weight 610 may include a mounting portion 610, a body portion 620, a first fixing portion 630, and a second fixing portion 640.

The mounting portion 610 is disposed on the upper surface of the first vertical portion 210. The body portion 620 is connected to the mounting portion 610 and the first fixing portion 630 is disposed at the upper end of the body portion 620 and may extend in the horizontal direction. The second fixing portion 640 is disposed at the lower end of the body portion 620 and may have the same shape as the first fixing portion 630. The mounting portion 610 and the body portion 620 may define a space and a space 650 defined by the mounting portion 610 and the body portion 620 may be defined by the first vertical portion 210 And the like. Accordingly, when the weight 600 is disposed on the outrigger 200, the shape of the space 650 formed in the weight 600 corresponds to the shape of the first vertical part 210, The weight 600 can be stably placed on the outrigger 200. [

The first fixing part 630 may include a first supporting part 631, a fixing bar 632, a second supporting part 633, and a fixing pin 634.

The first support portion 631 is disposed on one side of the body portion 620 and protrudes from the body portion 620. The fixing bar 632 has a first end fixed to the first supporting part 631 and rotatable about the first end, and a first fixing part 632 formed at a second end opposite to the first end, Hole 636. In the embodiment shown in FIG. The second support portion 633 may be disposed on the other side of the body portion 620 and may include a second fixing hole 635 having the same shape as the first fixing hole 636. The fixing pin 634 may penetrate the first fixing hole 636 and the second fixing hole 635 to fix the second end of the fixing bar 632 and the second supporting portion 633 .

The second fixing portion 640 has the same shape as the first fixing portion 630, and therefore, a repetitive description will be omitted.

The first fixing part 630 and the second fixing part 640 serve to fix the weight 600 to the outrigger 200. [ Accordingly, it is possible to prevent the weight 600 from being separated from the outrigger 200 during the operation. However, the present invention is not limited thereto, and the shape of the first fixing part 630 may have various shapes that can fix the weight to the outrigger 200.

The weight 600 may be disposed on the opposite outrigger 200 that is to be operated upon by a crane. Therefore, it is possible to prevent the crane from being conducted due to the weight of the weight 600. In addition, the outriggers are disposed on both sides of the vehicle, and are disposed on the front and rear sides, respectively, so that four outriggers may be disposed for each vehicle in general. Accordingly, the weight 600 may be disposed on the opposite outrigger to be operated, and if necessary, one weight 600 may be disposed on the outrigger on the front or rear, Respectively.

10 is a side view showing a state where a weight is attached to an outrigger according to an embodiment of the present invention. 11 is a side view showing the weight of Fig. 12 is a front view showing the weight of Fig.

The outrigger and the weight according to the present embodiment are substantially the same as the outrigger of Figs. 5 to 9 except for the shape of the weight. Therefore, repeated description is omitted.

10-12, a weight 1600 according to an embodiment of the present invention is disposed on the second horizontal portion 1230 and the first vertical portion 1210 of the outrigger 1200. [

The weight 1600 may include a first mounting portion 1610, a second mounting portion 1620, a body portion 1650, a first fixing portion 1630, and a second fixing portion 1640.

The first mounting portion 1610 is disposed on the upper surface of the first vertical portion 1210. The first mounting portion 1610 may have a first thickness. The second mounting portion 1620 is disposed on the upper surface of the second vertical flat portion 1230. The second mounting portion 1620 may have a second thickness that is thicker than the first thickness. The body portion 1620 is connected to the first and second mounting portions 1610 and 1620 and the first fixing portion 1630 is connected to the body portion 1620 located at the lower end of the second mounting portion 1620. [ 1650 and may extend in the horizontal direction. The second fixing portion 1640 is disposed adjacent to the first fixing portion 1630 and may have the same shape as the first fixing portion 1630. The first mounting portion 1610, the second mounting portion 1620 and the body portion 1650 can define a space 1660 and the first mounting portion 1610, the second mounting portion 1620 And the space 1660 defined by the body portion 1620 may have a shape corresponding to the shapes of the first vertical portion 1210 and the second horizontal portion 1230. [ Accordingly, when the weight 1600 is disposed on the outrigger 1200, the shape of the space 1660 formed in the weight 1600 is different from that of the first vertical portion 1210 and the second horizontal portion 1230, the weight 1600 can be stably placed on the outrigger 1200.

FIG. 13 is a cross-sectional view illustrating a state in which a conductive billboard is fastened to a second vertical portion according to an embodiment of the present invention. FIG. FIG. 14 is a bottom view of a conduction notification board according to an embodiment of the present invention. FIG.

13 and 14, a conductive board 700 according to an embodiment of the present invention includes a bottom portion 710, a first side wall portion 713, a second side wall portion 715, a groove portion 720, A sensor unit 730, a pressing unit 740, a fastening bar 750, and a rotation unit 760.

The bottom portion 710 is disposed below the second vertical portion 240. A groove 720 is formed at the center of the bottom portion 710. The groove portion 720 may be formed by partially removing the bottom portion 710, and the sensor portion 730 is disposed in the groove portion. The sensor unit 730 may be a switch that is pressed by pressure. For example, when the sensor unit 730 is pressed, the sensor unit 730 can determine that the crane is normally positioned. If the sensor unit 730 is protruded again, It can be judged that there is a risk of falling by inclining. Therefore, when the pressed sensor unit 730 protrudes, a signal indicating the danger of conduction can be transmitted. Signal transmission for notifying the danger of conduction will be described in detail with reference to FIG.

The first side wall part 713 protrudes from the bottom part 710 in the vertical direction. The second side wall portion 715 protrudes inward from the first side wall portion 713. The fastening bar 750 extends through the second sidewall 715 in a vertical direction, and a thread is formed on a side surface thereof. The rotation part 760 is disposed at the upper end of the fastening bar 750 and can rotate the fastening bar 750. The rotation part 760 can rotate the fastening bar 750 to move the fastening bar 750 up and down. The pressing portion 740 is disposed at the lower end of the fastening bar 750 and may press the upper surface of the second vertical portion 240 as the fastening bar 750 moves downward. Accordingly, the second vertical portion 240 can be fixed between the bottom portion 710 and the pressing portion 740.

The conduction notification board 700 may be formed of a metal material. However, the present invention is not limited thereto, and any material can be used as long as it can withstand a load.

In the present embodiment, the conductive notch 700 is fixed to the second vertical portion 240 using a fastening bar 750 having a threaded portion. However, the present invention is not limited thereto, Any other means may be used as long as it can be fixed to the second vertical portion.

15 is a block diagram illustrating a conduction notification board and a control unit according to an embodiment of the present invention.

15, a conduction notification board 700 according to an embodiment of the present invention includes a sensor unit 730 and a signal transmission unit 770. The control unit 320 includes a signal reception unit 321, (323) and an operation control unit (325).

The sensor unit 730 may be a switch that is pressed by pressure. For example, when the sensor unit 730 is pressed, the sensor unit 730 can determine that the crane is normally positioned. If the sensor unit 730 is protruded again, It can be judged that there is a risk of falling by inclining. Therefore, when the pressed sensor unit 730 protrudes, a signal indicating the danger of conduction can be transmitted. A signal indicating the danger of conduction is transmitted by the signal transmission unit 770.

The signal transmission unit 770 can wirelessly transmit a signal and the signal reception unit 321 can receive a signal transmitted by the signal transmission unit 770. When the signal receiving unit 321 receives a signal, the conduction announcement unit 323 can notify the signal reception. For example, the conduction announcement unit 323 may include a speaker that emits a beep when a signal is received, or a lamp that lights when a signal is received. When the conduction announcement unit 323 notifies the signal reception, the operator can control the operation control unit 325 to stop the operation of the crane. Therefore, when it is judged that there is a possibility of conduction, lifting of the weight by the crane can be stopped to prevent the conduction.

According to the present invention, the boom assembly includes a boom support disposed at the top thereof. Therefore, when the boom assembly is bent due to its heavy weight, the wire can be quickly cut out from the winch portion, but in this case, the wire can be prevented from rotating within the winch portion. As a result, the boom of the boom assembly is supported by the wire, so that the boom can be prevented from being bent.

Further, since the detachable weight is disposed on the opposite outrigger that performs the work, it is possible to prevent the crane from being conducted due to the weight weight.

In addition, a conduction notification plate is provided below the second vertical portion of the outrigger. It is judged that there is no danger of conduction when the sensor part is pressed and the outrigger is floated on the ground when the pressed sensor part is projected again so that it can be judged that the danger of conduction is increased. Accordingly, in this case, a signal indicating the danger of conduction is transmitted, and when the conduction notification unit operates, the operation control unit can be controlled to stop the operation, thereby preventing the crane from being turned off.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be understood.

100: Boom assembly 200: Outrigger
300: Equipment Cockpit 400: Loader
500: Boom support 600: Weight
700: evangelism notice board

Claims (8)

A boom assembly including a first boom fixed to a vehicle, a second boom drawn out from the first boom and extending in length, and a plurality of booms sequentially extended from the second boom to extend in length;
A boom support disposed at an upper end of the boom assembly and connecting an nth (n is a natural number) boom, which is sequentially extended from the first boom and the first boom, and connected to each other by wires;
A second horizontal portion extending from the first horizontal portion and extending from the first horizontal portion, a first vertical portion connected to the second horizontal portion and extending in the vertical direction, An outrigger including a second vertical portion drawn from the portion and contacting the ground;
A weight detachably disposed on the outrigger;
A bottom portion disposed below the second vertical portion, a sensor portion protruding from a bottom surface of the bottom portion, the sensor portion being pressed upon contact with the ground, and a signal transmitting portion transmitting a signal depending on whether the sensor portion is pressed, A conduction notification plate detachably installed at a lower portion of the second vertical portion; And
And a control unit installed in the vehicle and including a receiving unit for receiving a signal transmitted from the signal transmitting unit, a conduction notification unit for operating according to a signal of the receiving unit, and an operation control unit for stopping the operation of the crane,
The boom support includes:
A winch portion disposed at an upper end of the first boom and having a wire wound thereon, a wire being drawn out along an extension of the boom assembly,
A pulley unit disposed at an upper end of the second boom to the (n-1) th boom, for guiding the wire by guiding the wire; And
And a wire fixing portion disposed at an upper end of the n-th boom for fixing an end portion of the wire wound on the winch portion. The method according to claim 1,
Preferably,
A mounting portion disposed on an upper surface of the first vertical portion;
A body portion connected to the mounting portion;
A first fixing part disposed at an upper end of the body part and extending in a horizontal direction; And
And a second fixing portion disposed at a lower end of the body portion and having the same shape as the first fixing portion. 3. The method of claim 2,
And the space defined by the mounting portion and the body portion corresponds to the shape of the first vertical portion. 3. The method of claim 2,
Wherein the first fixing portion comprises:
A first support portion disposed at one side of the body portion and projecting from the body portion;
And a first fixing hole formed at a second end of the first end opposite to the first end, the first end being connected to the first support and rotatable about the first end;
A second support portion disposed on the other side of the body portion and including a second fixing hole having the same shape as the first fixing hole; And
And a fixing pin passing through the first fixing hole and the second fixing hole to fix the second end of the fixing bar and the second supporting portion. The method according to claim 1,
Preferably,
A first mounting portion disposed on an upper surface of the first vertical portion and having a first thickness;
A second mounting portion disposed on an upper surface of the second horizontal portion and having a second thickness that is thicker than the first thickness;
A body portion connected to the first and second mounting portions;
A first fixing part disposed at a lower end of the body part located at a lower end of the second mounting part and extending in a horizontal direction; And
And a second fixing part disposed adjacent to the first fixing part and having the same shape as the first fixing part. 6. The method of claim 5,
Wherein the space defined by the first mounting portion, the second mounting portion, and the body portion corresponds to the shape of the first vertical portion and the second horizontal portion. The method according to claim 1,
The conduction notification board,
A first sidewall portion protruding in a vertical direction from the bottom portion;
A second sidewall portion protruding inward from the first sidewall portion;
A fastening bar extending through the second side wall portion and extending in a vertical direction, the fastening bar having a screw shape;
A rotating part disposed at an upper end of the fastening bar and rotating the fastening bar;
A pressing part disposed at the lower end of the fastening bar and pressing the upper surface of the second vertical part as the fastening bar moves downward; And
Further comprising a groove formed on a bottom surface of the bottom portion, the groove portion receiving the sensor portion. The method according to claim 1,
Characterized in that the weight has a weight of between 3 and 5 tons.

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