阅读说明：本技术 钢梁焊接防护装置 (Steel beam welding protection device ) 是由 全玉国 夏卫国 王利鹏 刘克杨 赵龙 陈进 曹端 于 2021-07-09 设计创作，主要内容包括：本发明提供了一种钢梁焊接防护装置。钢梁焊接防护装置包括两个防护单元件,两个防护单元件可拆卸连接,两个防护单元件连接形成工作腔、第一避让槽、第二避让槽和第三避让槽,上翼缘板的待焊接处能够容置在工作腔中,工作腔的壁面能够阻挡熔渣和火花；第一避让槽、第二避让槽和第三避让槽均与工作腔连通,第一避让槽供腹板穿过,第二避让槽供上翼缘板和腹板穿过,第三避让槽供上翼缘板和腹板穿过,且穿设于第二避让槽和第三避让槽的上翼缘板能够支撑防护单元件。本发明提供的钢梁焊接防护装置,适用于钢梁的上翼缘板的焊接防护,装置结构简单、安装简便,防护效果好。(The invention provides a steel beam welding protection device. The steel beam welding protection device comprises two protection unit parts, wherein the two protection unit parts are detachably connected, the two protection unit parts are connected to form a working cavity, a first avoidance groove, a second avoidance groove and a third avoidance groove, the part to be welded of the upper flange plate can be contained in the working cavity, and the wall surface of the working cavity can block slag and sparks; the first groove of dodging, the second groove of dodging and the third groove of dodging all communicate with the working chamber, and the first groove of dodging supplies the web to pass, and the second dodges the groove and supplies flange board and web to pass, and the third dodges the groove and supplies flange board and web to pass, and wears to locate the second and dodges the upper flange board in groove and the third and can support the protection unit spare. The steel beam welding protection device is suitable for welding protection of the upper flange plate of the steel beam, and is simple in structure, simple and convenient to install and good in protection effect.)

1. Girder steel welding protector can be connected with the girder steel, the girder steel includes flange board and web on, the flange board on with the top of web is connected, its characterized in that includes:

the number of the protection unit pieces is two, and the two protection unit pieces are detachably connected; the two protection unit parts are connected to form a working cavity, a first avoidance groove, a second avoidance groove and a third avoidance groove, the to-be-welded part of the upper flange plate can be contained in the working cavity, and the wall surface of the working cavity can block slag and sparks;

the first groove of dodging, the second dodge the groove with the third dodge the groove all with the working chamber intercommunication, first dodge the trench in the bottom of working chamber, the second dodge the trench in the front side of working chamber, the third dodge the trench in the rear side of working chamber, first front end of dodging the groove with the second dodges the groove intercommunication, first rear end of dodging the groove with the third dodges the groove intercommunication, first dodge the groove and supply the web passes, the second dodges the groove and supply go up the flange with the web passes, the third dodges the groove and supply go up the flange with the web passes.

2. The steel beam welding guard according to claim 1, wherein the guard unit piece includes:

each protective unit element is provided with one bottom breaking plate, the two bottom breaking plates are arranged at intervals to form a bottom plate, and a gap between the two bottom breaking plates is the first avoidance groove;

each protective unit element is provided with one front breaking plate, the bottom end of each front breaking plate is connected with the bottom breaking plate, the two front breaking plates are spliced to form a front plate, and the front plate is provided with the second avoidance groove;

each protective unit element is provided with one front breaking plate, the bottom end of each front breaking plate is connected with the corresponding bottom breaking plate, the two rear breaking plates are spliced to form a rear plate, and the rear plate is provided with the third avoidance groove;

each protective unit element is provided with one side plate, the front end of each side plate is connected with the front breaking plate, the rear end of each side plate is connected with the rear breaking plate, and the bottom end of each side plate is connected with the bottom breaking plate;

the bottom plate, the front plate, the rear plate and the side plates mutually enclose to form the working cavity.

3. The steel beam welding protection device according to claim 2, wherein the front plate is further provided with a working opening, the working opening is located above the second avoiding groove, the second avoiding groove and the working opening are arranged at intervals, the working opening is communicated with the working cavity, and the working opening is used for a welding tool and a hand of a constructor to stretch into the working cavity.

4. The steel beam welding guard according to claim 3, wherein the guard unit piece further includes a flange piece connected to the front breaking plate and located at a side of the working port, the flange piece extending toward the working chamber with respect to the front breaking plate.

5. The steel beam welding guard of claim 4 wherein each said front panel is connected to one of said flanges, the flanges being progressively closer together in the direction of extension of either said flange.

6. The steel beam welding protection device of claim 2, further comprising a connecting piece, wherein the rear cutting plates are provided with connecting holes, and the connecting piece can penetrate through the connecting holes and can bond the two rear cutting plates to each other.

7. The steel beam welding guard of claim 6 wherein the connection hole is open at the top of the rear breakout plate.

8. The steel beam welding protection device according to claim 2, wherein the second avoidance groove comprises a transverse portion and a longitudinal portion, the transverse portion is transversely arranged, the longitudinal portion is longitudinally arranged, the transverse portion is used for the upper flange plate to penetrate through, the longitudinal portion is used for the web plate to penetrate through, the top end of the longitudinal portion is communicated with the transverse portion, and the bottom end of the longitudinal portion extends to the bottom end of the front plate and is communicated with the first avoidance groove.

9. The steel beam welding guard of claim 8, wherein each of the front breaking plates has a first split notch, and the two first split notches are communicated with each other to form the transverse portion; preceding disconnected board includes first connecting portion and second connecting portion, first connecting portion are located the top of second connecting portion, just first concatenation breach is separated first connecting portion with the second connecting portion, the tip of second connecting portion for the tip of first connecting portion transversely contracts inwards, two the tip of first connecting portion can splice each other, two the second connecting portion interval sets up in order to form vertical portion.

10. The steel beam welding guard of any one of claims 2 to 9 further comprising a fire protection mat laid on the top surface of the bottom break plate.

Technical Field

The invention relates to the technical field of welding, in particular to a steel beam welding protection device.

Background

During the butt welding of steel beams, a large amount of high-temperature slag and sparks are generated. In order to prevent falling slag or sparks from damaging materials stacked on a construction site or injuring constructors on the ground, a fire pot or a fire device is usually hung directly below a steel beam during welding of the steel beam. However, the distance between the fire receiving basin below the lower flange plate and the upper flange plate is relatively long, so that the fire receiving basin cannot effectively receive sparks generated during welding of the upper flange plate; some welding ignition devices suitable for the upper flange plate are complex in structure and inconvenient to use.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the steel beam welding protection device is suitable for welding protection of the upper flange plate of the steel beam, and is simple in structure, simple and convenient to install and good in protection effect.

According to the embodiment of the invention, the steel beam welding protection device comprises: the number of the protection unit pieces is two, and the two protection unit pieces are detachably connected; the two protection unit parts are connected to form a working cavity, a first avoidance groove, a second avoidance groove and a third avoidance groove, the to-be-welded part of the upper flange plate can be contained in the working cavity, and the wall surface of the working cavity can block slag and sparks; the first groove of dodging, the second dodge the groove with the third dodge the groove all with the working chamber intercommunication, first dodge the trench in the bottom of working chamber, the second dodge the trench in the front side of working chamber, the third dodge the trench in the rear side of working chamber, first front end of dodging the groove with the second dodges the groove intercommunication, first rear end of dodging the groove with the third dodges the groove intercommunication, first dodge the groove and supply the web passes, the second dodges the groove and supply go up the flange with the web passes, the third dodges the groove and supply go up the flange with the web passes.

The steel beam welding protection device provided by the embodiment of the invention at least has the following beneficial effects: when the device needs to be installed, the two protection unit parts are installed on the steel beam from two sides of the steel beam respectively, and then the two protection unit parts are connected, so that the installation is simple and convenient; the first groove of dodging, the second groove of dodging and the third groove of dodging that two protection unit spare formed after connecting all can dodge the girder steel, and the last flange plate of girder steel plays the supporting role to whole device. The two protection unit parts are connected to form a working cavity, the part to be welded of the upper flange plate can be accommodated in the working cavity, and the wall surface of the working cavity can block sparks during welding or bear slag during welding, so that the protection effect during welding is achieved; because the device directly encloses the outside of establishing at last flange board, the device can effectively restrict the range that splashes of spark or slag, and the guard effect is good. The steel beam welding protection device provided by the invention is simple in structure, simple and convenient to install, suitable for welding protection of the upper flange plate and good in welding protection effect on the upper flange plate.

According to some embodiments of the invention, the guard unit comprises: the guard unit piece includes: each protective unit element is provided with one bottom breaking plate, the two bottom breaking plates are arranged at intervals to form a bottom plate, and a gap between the two bottom breaking plates is the first avoidance groove; each protective unit element is provided with one front breaking plate, the bottom end of each front breaking plate is connected with the bottom breaking plate, the two front breaking plates are spliced to form a front plate, and the front plate is provided with the second avoidance groove; each protective unit element is provided with one front breaking plate, the bottom end of each front breaking plate is connected with the corresponding bottom breaking plate, the two rear breaking plates are spliced to form a rear plate, and the rear plate is provided with the third avoidance groove; each protective unit element is provided with one side plate, the front end of each side plate is connected with the front breaking plate, the rear end of each side plate is connected with the rear breaking plate, and the bottom end of each side plate is connected with the bottom breaking plate; the bottom plate, the front plate, the rear plate and the side plates mutually enclose to form the working cavity.

According to some embodiments of the invention, the front plate is further provided with a working port, the working port is located above the second avoiding groove, the second avoiding groove and the working port are arranged at intervals, the working port is communicated with the working cavity, and the working port is used for a welding tool and a hand of a constructor to extend into the working cavity.

According to some embodiments of the invention, the guard unit piece further includes a flange piece connected to the front breaking plate and located at a side of the working opening, the flange piece extending toward the working chamber with respect to the front breaking plate.

According to some embodiments of the invention, each of the front breaking plates is connected to one of the folding members, and the two folding members are gradually close to each other along the extending direction of any one of the folding members.

According to some embodiments of the invention, the steel beam welding protection device further comprises a connecting piece, the rear breaking plate is provided with a connecting hole, and the connecting piece can penetrate through the connecting hole and bond the two rear breaking plates to each other.

According to some embodiments of the invention, the connection hole is opened at a top of the rear partition plate.

According to some embodiments of the invention, the second avoidance groove comprises a transverse portion and a longitudinal portion, the transverse portion is transversely arranged, the longitudinal portion is longitudinally arranged, the transverse portion is used for the upper flange plate to pass through, the longitudinal portion is used for the web plate to penetrate through, the top end of the longitudinal portion is communicated with the transverse portion, and the bottom end of the longitudinal portion extends to the bottom end of the front plate and is communicated with the first avoidance groove.

According to some embodiments of the invention, each of the front breaking plates has a first splicing notch, and the two first splicing notches are communicated with each other to form the transverse portion; preceding disconnected board includes first connecting portion and second connecting portion, first connecting portion are located the top of second connecting portion, just first concatenation breach is separated first connecting portion with the second connecting portion, the tip of second connecting portion for the tip of first connecting portion transversely contracts inwards, two the tip of first connecting portion can splice each other, two the second connecting portion interval sets up in order to form vertical portion.

According to some embodiments of the invention, the steel beam welding guard further comprises a fire protection mat laid on the top surface of the bottom breakout board.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described with reference to the following figures and examples, in which:

FIG. 1 is a schematic view of the principle of steel beam welding protection;

FIG. 2 is an overall view of the steel beam welding guard;

FIG. 3 is an exploded view of the steel beam welding guard;

FIG. 4 is a schematic view of a steel beam welding protection device in use;

FIG. 5 is a front view of the steel beam weld guard of FIG. 2;

FIG. 6 is a partial schematic view (main view angle) of the guard unit piece;

FIG. 7 is a rear view of the steel beam weld guard of FIG. 2;

FIG. 8 is a bottom view of the steel beam weld guard of FIG. 2;

figure 9 is a simplified schematic (top view) of the hem member.

Reference numerals: 101-steel beam, 102-upper flange plate, 103-web plate, 104-lower flange plate, 201-protective unit element, 202-connecting element, 203-working cavity, 204-working port, 205-fire-proof pad, 301-front breaking plate, 302-side plate, 303-folding element, 304-rear breaking plate, 305-connecting hole, 306-first splicing gap, 307-second splicing gap, 308-bottom breaking plate, 501-transverse part, 502-longitudinal part, 503-second avoidance groove, 504-front plate, 601-first connecting part, 602-second connecting part, 701-third avoidance groove, 702-rear plate, 801-bottom plate, 802-first avoidance groove.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, several means are one or more, and plural means are two or more. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.

In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The invention provides a steel beam welding protection device (hereinafter referred to as a device) which can be connected with a steel beam 101, and the protection principle of the device is mainly that a baffle plate is used for blocking sparks or molten slag by referring to figure 1. The structure of the steel beam 101 can refer to fig. 1, the section of the steel beam 101 is H-shaped (or i-shaped), the steel beam 101 includes an upper flange plate 102, a lower flange plate 104 and a web plate 103, the upper flange plate 102 and the lower flange plate 104 are both transversely arranged, the web plate 103 is longitudinally arranged, the upper end of the web plate 103 is connected with the upper flange plate 102, and the lower end of the web plate 103 is connected with the lower flange plate 104.

Referring to fig. 2 and 3, the steel beam welding protection device includes two protection unit pieces 201, and the two protection unit pieces 201 are detachably connected with each other; referring to fig. 5, 7 and 8, the two guard unit pieces 201 are connected to form a working chamber 203, a first avoidance groove 802, a second avoidance groove 503 and a third avoidance groove 701. Referring to fig. 4, when the device is used, the welding position of the upper flange plate 102 of the steel beam 101 is accommodated in the working chamber 203, and the wall surface of the working chamber 203 can block or bear slag and sparks. The first avoidance groove 802, the second avoidance groove 503 and the third avoidance groove 701 are all communicated with the working cavity 203, the first avoidance groove 802 is located at the bottom of the working cavity 203 (refer to fig. 8), the second avoidance groove 503 is located at the front side of the working cavity 203 (refer to fig. 5), the third avoidance groove 701 is located at the rear side of the working cavity 203 (refer to fig. 7), the front end of the first avoidance groove 802 is communicated with the second avoidance groove 503, and the rear end of the first avoidance groove 802 is communicated with the third avoidance groove 701. The first avoidance groove 802 is used for the web 103 to pass through, the second avoidance groove 503 is used for the upper flange plate 102 and the web 103 to pass through, and the third avoidance groove 701 is also used for the upper flange plate 102 and the web 103 to pass through. Referring to fig. 4, after the upper flange plate 102 is inserted through the second and third escape grooves 503 and 701, the upper flange plate 102 can support the sheathing unit piece 201.

Referring to fig. 4, the specific definitions of "front" and "rear" with respect to the device in the present invention are: when a constructor uses the device for welding protection, the side of the device closer to the constructor is front and the side of the device relatively far from the constructor is rear along the extending direction of the steel beam 101.

When the device needs to be installed, the two protection unit parts 201 are installed on the steel beam 101 from two sides of the steel beam 101 respectively, and then the two protection unit parts 201 are connected, so that the installation is simple and convenient; the first avoidance groove 802, the second avoidance groove 503 and the third avoidance groove 701 formed after the two protection unit parts 201 are connected can avoid the steel beam 101, and the upper flange plate 102 of the steel beam 101 can support the whole device. The two protective unit parts 201 are connected to form a working cavity 203, the part to be welded of the upper flange plate 102 is accommodated in the working cavity 203, and the wall surface of the working cavity 203 can block sparks during welding or bear slag during welding, so that the protective effect during welding is achieved; because the device directly encloses the outside of establishing at upper flange board 102, the device can effectively restrict the range that splashes of spark or slag, and the guard effect is good. The steel beam welding protection device provided by the invention is simple in structure, simple and convenient to install, suitable for welding protection of the upper flange plate 102 and good in welding protection effect on the upper flange plate 102.

The specific structure of the protective unit element in some embodiments is described below, which is relatively simple and has low processing difficulty. Referring to fig. 3, the protective unit piece 201 includes a bottom breaking plate 308, a front breaking plate 301, a rear breaking plate 304 and a side plate 302, and in each protective unit piece 201, the bottom breaking plate 308, the front breaking plate 301, the rear breaking plate 304 and the side plate 302 are respectively provided one by one. Referring to fig. 8, two bottom dividing plates 308 are arranged at intervals to form a bottom plate 801, and a gap between the bottom dividing plates 308 is a first avoidance groove 802; a floor 801 is located at the bottom of the working chamber 203, the floor 801 serving to block slag and sparks from falling to the ground and to carry falling slag and sparks. Referring to fig. 5, the bottom end of the front breaking plate 301 is connected to the bottom breaking plate 308, the two front breaking plates 301 are spliced to form a front plate 504, and the second avoiding groove 503 is located on the front plate 504. Referring to fig. 7, the bottom end of the rear cutting plate 304 is connected with the bottom cutting plate 308, two rear cutting plates 304 are spliced to form a rear plate 702, and a third avoiding groove 701 is positioned on the rear plate 702. The front end of the side plate 302 is connected with the front cutting plate 301, the rear end of the side plate 302 is connected with the rear cutting plate 304, and the bottom end of the side plate 302 is connected with the bottom cutting plate 308. Referring again to fig. 2, the bottom plate 801, the front plate 504, the rear plate 702, and the side plates 302 enclose a working chamber 203.

The bottom cutting plate 308 needs to bear slag and sparks falling due to gravity, and if the bottom cutting plate 308 is directly contacted with the high-temperature slag and sparks, the bottom cutting plate 308 may deform or even perforate. Thus, referring to fig. 2, in some embodiments, the apparatus further comprises a fire mat 205, the fire mat 205 being laid on the top surface of the bottom cutting plate 308. The fireproof pad 205 is made of fireproof or high-temperature resistant material, specifically asbestos cloth; the fire-proof pad 205 can prevent the bottom cutting plate 308 from directly contacting high-temperature slag and sparks, thereby prolonging the service life of the device.

Referring to fig. 5, the second avoidance groove 503 includes a transverse portion 501 and a longitudinal portion 502, the transverse portion 501 is transversely disposed, the longitudinal portion 502 is longitudinally disposed, a top end of the longitudinal portion 502 is communicated with the transverse portion 501, and a bottom end of the longitudinal portion 502 extends to a bottom end of the front plate 504 and is communicated with the first avoidance groove 802. In this arrangement, the shape of the second avoiding groove 503 matches the shape of the steel beam 101, so that the device is connected to the steel beam 101; the transverse portion 501 is penetrated by the upper flange plate 102 and the longitudinal portion 502 is penetrated by the web 103.

Referring to fig. 5 and 6, each front dividing plate 301 has a first splicing notch 306, the first splicing notches 306 are transversely arranged, and the two first splicing notches 306 are communicated with each other to form a transverse portion 501. The front breaking plate 301 includes a first connecting portion 601 and a second connecting portion 602, the first connecting portion 601 and the second connecting portion 602 are separated by the first splicing notch 306, and the first connecting portion 601 is located above the second connecting portion 602. When viewed in the transverse direction, the end of the second connecting portion 602 is recessed relative to the end of the first connecting portion 601 (or the end of the first connecting portion 601 protrudes relative to the end of the second connecting portion 602), the ends of the two first connecting portions 601 can be spliced together to connect the two front cutting boards 301 to form the front board 504, the ends of the two second connecting portions 602 are spaced apart, and the gap formed between the two second connecting portions 602 is the longitudinal portion 502. After the upper flange plate 102 penetrates through the second avoiding groove 503, under the action of the self-weight of the entire apparatus, the bottom of the upper flange plate 102 will abut against the bottom of the first connecting portion 601 so as to support the front breaking plate 301.

The second avoiding groove 503 is constructed by the above arrangement, and the processing difficulty is relatively low. The shape of the third avoidance groove 701 is similar to that of the second avoidance groove 503, and the manner of providing the third avoidance groove 701 in the rear plate 702 is similar to that of providing the second avoidance groove 503 in the front plate 504, which will not be described in detail herein.

Referring to fig. 2 and 3, in some embodiments, the steel beam welding protection device further includes a connecting member 202, the rear breaking plate 304 is provided with a connecting hole 305, the connecting member 202 can penetrate through the connecting hole 305 and bind the two rear breaking plates 304 together, so as to splice the two protection unit pieces 201, and the connecting member 202 may be a binding wire, a binding tape, a rope, or the like. The connection mode is simple, low in cost and convenient to construct. In some embodiments, the connection hole 305 is formed at the top of the rear breaking plate 304, and the connection element 202 is located at a relatively high position, so that the connection element 202 is not easily exposed to high-temperature sparks, the connection element 202 is not easily fused, and the connection stability between the protection unit elements 201 is high.

Referring to fig. 2 and 3, in some embodiments, the front plate 504 also defines a working opening 204 for a worker to insert a welding tool (e.g., a welding gun, and some corresponding auxiliary tools) and hand into the working cavity 203 for welding. The working port 204 is located above the second avoiding groove 503, and is arranged at an interval with the second avoiding groove 503, and the working port 204 is communicated with the working cavity 203. The front partition plate 301 has a second splice notch 307, and the two second splice notches 307 communicate to form the working port 204. In some embodiments, the side plates 302, the front plate 504 and the rear plate 702 are at the same height, and the upper end of the working opening 204 of the front plate 504 extends to be flush with the top of the front plate 504, so that the working opening 204 can be ensured to be large enough for a welding tool to extend into, and the side plates 302 and the rear plate 702 can be ensured to be high enough to ensure the wind shielding effect of the side plates 302 and the rear plate 702, thereby avoiding the slag or spark from spreading in the wind in a large range, and ensuring the protection effect.

Referring to fig. 3, in some embodiments, the protective unit piece 201 further includes a folding member 303, the folding member 303 is connected to the front breaking plate 301, the folding member 303 is located at a side of the working port 204, and the folding member 303 extends toward the working chamber 203 relative to the front breaking plate 301. The edge folding piece 303 can block a part of sparks reflected by the wall surface of the working cavity 203, and reduce sparks splashed from the working cavity 203 through the working opening 204, so that harm to a constructor is reduced; and with the hem 303 extending inwardly of the working chamber 203 rather than outwardly of the working chamber 203, this arrangement reduces the obstruction of the hem 303 to the welding tool or the hand of the operator extending into the working chamber 203. In the extending direction of any of the folding members 303, the two folding members 303 gradually come close to each other. Referring to fig. 9, when the two folding pieces 303 gradually approach each other, an included angle (corresponding to ═ α in the figure) between the folding pieces 303 and the front breaking plate 301 is an obtuse angle; compared with other conditions (the angle alpha is less than or equal to 90 degrees), in the setting mode, the folding piece 303 has a certain shielding effect on the working opening 204, the folding piece 303 has a better anti-splashing effect on sparks in the working cavity 203, and the protection effect on a constructor is better.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention. Furthermore, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.