KR102474968B1 - Welding device for reinforcing truck loading box - Google Patents

Abstract

Disclosed is a welding device for reinforcing a truck loading box which can detect a damaged portion of a truck loading box to weld a reinforcing plate on the truck loading box. The welding device for reinforcing a truck loading box to fix an object to be welded on a truck loading box comprises: a welding part to weld the object to be welded on the bottom surface of the truck loading box; a rail part forming a moving path of the welding part and extended in an extension direction of the truck loading box; and a moving part capable of running in the extension direction, allowing the rail part to be mounted on an upper portion thereof to be moved, and at least partially movable vertically. The rail part is formed to be at least partially moved in the extension direction to drive the welding part straight in the extension direction or rotate the welding part in a circumferential direction and is coupled to the welding part to be relatively rotated. The welding part is configured to generate image data by photographing the truck loading box on the truck loading box and receive the generated image data to detect a position at which the object to be welded is to be welded to weld the object to be welded.

Description

Welding device for reinforcing truck loading box}

The present invention relates to a welding device for reinforcing a truck loading box, and relates to a welding device for reinforcing a truck loading box capable of welding a reinforcement plate to a truck loading box.

In general, a truck bed may be a compartment provided at the rear of a truck to load a load. For example, sand, steel, etc. may be loaded in the truck loading box, and when the above-described sand, steel, etc. are loaded for a long time, defects such as wear and tear may occur on the bottom surface of the truck loading box.

Conventionally, in order to prevent abrasion, damage, etc. from occurring on the bottom surface of the truck loading box, a reinforcing plate was installed on the bottom surface. That is, a reinforcing plate was seated on the bottom surface of the truck loading box, and a welder welded the reinforcing plate to the truck loading box on the seated reinforcement plate so that sand, steel, etc. were seated on the reinforcement plate.

However, in the conventional case, since the welder manually welds, the speed of the welding process is relatively slow.

Also, the welder is working on the welding. There is a problem that the body is caught in the gap between the bottom surface of the truck bed and the reinforcement plate, causing injury.

In addition, since the space inside the truck loading box is relatively narrow, there is a problem in that a welder cannot easily proceed with a welding operation.

The development of a welding apparatus for solving such a problem is continuously required.

The background description of the invention has been prepared to facilitate understanding of the present invention. It should not be construed as an admission that matters described in the art that form the background of the invention exist as prior art.

JP 1998-137955 A

The present invention provides a truck loading box reinforcement welding device capable of detecting a damaged portion of a truck loading box and welding a reinforcing plate to a truck loading box.

In addition, the present invention provides a truck loading box reinforcement welding device capable of welding a reinforcement plate to a truck loading box regardless of the size of the truck loading box.

A welding device for reinforcing a truck loading box according to an embodiment of the present invention for solving the above problems is a welding device for fixing an object to be welded on a truck loading box, and a welding part for welding the object to be welded to the bottom surface of the truck loading box. ; a rail part forming a movement path of the welding part and extending along the extending direction of the truck loading box; and a movable part capable of traveling in the extension direction, on which the rail part is movably seated, and at least a part of which is movable up and down, wherein the rail part linearly drives the welding part along the extension direction, or , At least a part is formed to be movable along the extension direction so as to be rotatable along the circumferential direction, and is rotatably coupled to the welding part, and the welding part photographs the truck loading box on the truck loading box to obtain image data And configured to detect and weld a position where the object to be welded is to be welded by receiving the generated image data.

The welding part may apply heat to the object to be welded so as to melt a part of the object to be welded, and the welder is disposed inclined downward with respect to the rail part; An image camera coupled to the welding machine and generating image data by photographing the top of the truck loading box; a detector electromagnetically connected to the imaging device, coupled to the welding device, receiving image data generated by the imaging device and detecting a damaged portion on the truck loading box; and an adjuster having one side rotatably supported by the rail unit, the other side coupled to the welding machine, and at least a part of which is formed to be tingting; The imaging device includes a CCD-type line scan camera that scans along an extension direction and transmits pixel values corresponding to a single line line by line; and at least one or more LEDs to illuminate the truck loading box, wherein the scan time of the line scan camera is set to a time set in the line scan camera or a time provided from the detector, The detector may include a processing module that collects and processes image data generated by the image camera and outputs processed data; and a display module connected to the processing module to receive the processing data and display a detection result corresponding to the processing data through a detection program, wherein the detection result is the depth of the damaged portion and the depth of the damaged portion. It includes information on the size according to the area and the location of the damaged portion, and an image of the damaged portion in the location information.

The rail part extends in an extension direction and is movably coupled to an upper portion of the moving part in a width direction horizontally orthogonal to the extension direction. a rail member provided; a case movably disposed above the rail member; a pinion gear disposed inside the case and meshed with the rack gear; a first motor coupled to the inside of the case, disposed along the width direction, coaxially coupled to the pinion gear, and generating rotational driving force; a second motor disposed along the vertical direction, coupled to the inside of the case, and generating rotational driving force; a first bevel gear coaxially connected to the second motor, having a width decreasing from an upper side to a lower side, and having gear teeth on an outer circumferential surface of the first bevel gear; a second bevel gear disposed along an extending direction, having a reduced width along an extending direction, having gear teeth on an outer circumferential surface thereof, and meshing with the first bevel gear; and a bearing coaxially coupled to the second bevel gear, rotatably supported on an outer wall of the case, and coupled to the welding portion, wherein the adjuster is coupled to the bearing and interlocks with rotation of the bearing. a first body formed to be rotatable along the circumferential direction and expandable and contractible along the radial direction; a second body coupled to the welding machine and disposed in a rotated state within a range of more than 30° and less than 45° with respect to the first body; and a connecting body having one end connected to the first body and the other end connected to the second body, and at least a portion of which is formed to be tiltable, wherein the connecting body includes the first body and the second body. A plurality of corrugated pipes connecting the; And disposed inside the plurality of corrugated tubes, rotatably coupled to the first body, and the other end rotatably coupled to the second body, so that its length can be adjusted along the radial direction, A plurality of cylinders formed to be stretchable and contractible, and when any one of the plurality of cylinders is extended, the other cylinder disposed opposite to the one cylinder is contracted, and the The ratio of the contracted length of the other cylinder to the extended length is set to be greater than 0.3 and less than 0.5.

The moving unit may include a moving unit body; a plurality of rollers rotatably coupled to the lower part of the moving unit body; a connection member coupled to the movable body to be stretchable and contractible in a vertical direction; and a drive member having one end rotatably coupled to the movable body and the other end connected to the connecting member and providing power to the connecting member. And forming a secondary rail extending in the width direction on the upper portion, the rail portion movably coupled to the secondary rail, the seating plate supported by the connecting member; And a support member formed to be stretchable and contractible so that its length can be varied in conjunction with the extension and contraction of the connecting member, one end of which is rotatably coupled to the seat plate and the other end is supported on the workshop floor. , The connecting member, a plurality of connecting links are alternately arranged so that each obliquely crosses each other along the vertical direction; a plurality of connecting pins inserted into overlapping portions of the plurality of connecting links to connect the plurality of connecting links to be rotatably relative to each other; Among the plurality of connecting links, a pair of connecting links positioned at the uppermost end, one connecting link is rotatably coupled to the lower portion of the seating plate, and the other connecting link extends to a first guide rail provided below the seating plate. Of the pair of connecting links movably coupled along and located at the lowermost end of the plurality of connecting links, one connecting link is rotatably coupled to the upper part of the moving part body, and the other connecting link is rotatably coupled to the upper part of the moving part body. is movably coupled to the second guide rail provided in the extending direction, and the support member is stretchable and contractible, one end of which is rotatably coupled to an end of the seating plate and the other end is on the floor of the workshop. a contactable support cylinder; and an auxiliary cylinder, one end of which is rotatably coupled to the support cylinder and the other end of which is rotatably coupled to an end of the moving unit body, wherein the auxiliary cylinder has an inner portion penetrated and a screw thread is formed on the inner circumferential surface through which the inner portion is penetrated. The length adjusting member is formed; A first length adjustment shaft having one end rotatably coupled to the support cylinder and the other end passing through one end of the length adjustment member and coupled in a right-handed, left-handed or right-handed manner; a second length adjusting shaft having one end rotatably coupled to the moving unit body and the other end penetrating the other end of the length adjusting member and coupled in a right-handed, left-handed or right-handed manner; and electromagnetically connected to the support cylinder, coupled to the length adjusting member so as to rotate the length adjusting member in conjunction with the extension and contraction of the support cylinder.

The welding machine includes a tip body through which a welding wire passes, a cutout formed in at least one region of the tip body to expose at least a portion of the welding wire, and a pressing member for pressing the welding wire through the cutout; a contact tip inserted into the incision and having an insertion member provided between the welding wire and the pressing member; a gas diffuser connected to the contact tip and supplying a shielding gas; a nozzle connected to the gas diffuser to surround the contact tip and spraying the shielding gas;

a torch body connected to the gas diffuser; an insulator connected to the torch body and provided to surround the gas diffuser; a wire supply unit supplying the welding wire toward the contact tip; a gas supply unit supplying the shielding gas through the gas diffuser; A power supply unit for supplying power to at least one of a power transmission member for transmitting power to an insertion member provided between the welding wire and the pressing member and a power supply unit for supplying power to at least one of the contact tip, wherein power is supplied to the welding wire through the insertion member. supplied, the insertion member is formed of a material with lower resistance than the tip body.

According to the present invention, the reinforcing plate may be seated on the truck loading box and welded to the truck loading box and the reinforcing plate mainly on the damaged portion of the truck loading box. Accordingly, while attaching the reinforcing plate to the truck loading box, it is possible to repair the damaged portion of the truck loading box.

In addition, since the rail part moves in the width direction on the truck loading box and the welding part rotates in the circumferential direction, the reinforcing plate can be welded to the truck loading box of various sizes regardless of the size of the truck loading box.

In addition, since the welding part is formed to be tiltable, it is possible to more precisely weld the damaged part.

1 is a view schematically showing the structure of a welding apparatus for reinforcing a truck loading box according to an embodiment of the present invention, a truck, and a reinforcing plate.
Figure 2 is a perspective view showing the structure of a welding device for truck loading box reinforcement.
3 is a view showing a state in which a welding device for reinforcing a truck loading box welds a reinforcement plate to a truck loading box.
4 is a view showing a partial structure of a rail unit according to an embodiment of the present invention.
5 is a view showing an extended state of a connecting member of a moving unit according to an embodiment of the present invention.
6 is a perspective view showing the structure of a welding part according to an embodiment of the present invention.
7 is a cross-sectional view showing a state in which a welding machine is tilted through an adjuster.
8 is a view showing a detailed structure of a welding machine.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, since various changes can be made to the embodiments, the scope of the patent application is not limited or limited by these embodiments. It should be understood that all changes, equivalents or substitutes to the embodiments are included within the scope of rights.

Specific structural or functional descriptions of the embodiments are disclosed for illustrative purposes only, and may be modified and implemented in various forms. Therefore, the embodiments are not limited to the specific disclosed form, and the scope of the present specification includes changes, equivalents, or substitutes included in the technical spirit.

Although terms such as first or second may be used to describe various components, such terms should only be construed for the purpose of distinguishing one component from another. For example, a first element may be termed a second element, and similarly, a second element may be termed a first element.

It should be understood that when an element is referred to as being “connected” to another element, it may be directly connected or connected to the other element, but other elements may exist in the middle.

Terms used in the examples are used only for descriptive purposes and should not be construed as limiting. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that the presence or addition of numbers, steps, operations, components, parts, or combinations thereof is not precluded.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the embodiment belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

In addition, in the description with reference to the accompanying drawings, the same reference numerals are given to the same components regardless of reference numerals, and overlapping descriptions thereof will be omitted. In describing the embodiment, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the embodiment, the detailed description will be omitted.

Advantages and features of the present invention, and methods of achieving them, will become clear with reference to the detailed description of the following embodiments taken in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, only these embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs. It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims.

In the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are the same as those commonly understood by one of ordinary skill in the art to which the present invention belongs. It has meaning. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the embodiments of the present invention, an ideal or excessively formal meaning not be interpreted as

The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are illustrative, so the present invention is not limited to the details shown. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. When 'includes', 'has', 'consists of', etc. mentioned in this specification is used, other parts may be added unless 'only' is used. In the case where a component is expressed in the singular, the case including the plural is included unless otherwise explicitly stated.

In interpreting the components, even if there is no separate explicit description, it is interpreted as including the error range.

In the case of a description of a positional relationship, for example, 'on top of', 'on top of', 'at the bottom of', 'next to', etc. Or, unless 'directly' is used, one or more other parts may be located between the two parts.

When an element or layer is referred to as “on” another element or layer, it includes all cases where another element or layer is directly on top of another element or another layer or other element intervenes therebetween. Like reference numbers designate like elements throughout the specification.

The size and thickness of each component shown in the drawings are shown for convenience of description, and the present invention is not necessarily limited to the size and thickness of the illustrated components.

Each feature of the various embodiments of the present invention can be partially or entirely combined or combined with each other, and as those skilled in the art can fully understand, various interlocking and driving operations are possible, and each embodiment can be implemented independently of each other. It may be possible to implement together in an association relationship.

1 is a view schematically showing the structure of a truck loading box reinforcement welding device and a truck and a reinforcing plate according to an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of a truck loading box reinforcement welding device, FIG. is a view showing a state in which a welding device for reinforcing a truck loading box welds a retaining board to a truck loading box, FIG. 4 is a view showing a partial structure of a rail part according to an embodiment of the present invention, and FIG. Figure 6 is a perspective view showing the structure of a welded part according to an embodiment of the present invention, Figure 7 is a view showing a state in which the welder is tilted through an adjuster A cross-sectional view, and FIG. 8 is a view showing a detailed structure of a welding machine.

The truck loading box reinforcement welding apparatus according to an embodiment of the present invention is for reinforcing the truck loading box (C) for welding the reinforcing plate (P) to the above-mentioned bottom surface in order to reinforce the bottom surface of the truck loading box (C) of the truck (T). It may be the welding device 100 (hereinafter, referred to as a welding device). That is, the welding device 100 is formed to be movable, and the welding machine 111 is disposed on the bottom surface of the loading box (C) on which the reinforcement plate (P) is seated, and automatically loads the reinforcement plate (P) in the loading box (C). It can be a device that can be welded.

In the following, the structure of the welding apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8 .

The welding device 100 is a device for fixing an object to be welded (ie, a reinforcing plate) on the truck loading box (C), and welds the object to be welded (ie, the reinforcing plate) to the bottom surface of the loading box (C) of the truck (T). The welded portion 110 to form a moving path of the welded portion, the rail portion 120 extending along the extension direction of the truck loading box (C) and travelable in the extension direction, and the rail portion 120 is movable on top of the rail portion 120 It may include a movable unit 130 which is seated and at least a part of which is movable up and down.

The welding unit 110 may include a welding machine 111 , an image camera 112 , a detector 113 , and a controller 114 .

Referring to Figures 7 (a) and 7 (b), the welder 111 includes a welding torch for generating an arc in an object to be welded so that welding is performed, and a welding wire serving as an electrode in the welding torch. It may include a wire supply unit for supplying, a power supply unit for supplying power, and a gas supply unit for supplying a shielding gas on the object to be welded.

A welding torch is positioned on a workpiece to generate an arc at the workpiece to perform welding. Such a welding torch receives a welding wire w from a wire supply unit and receives power from a power supply unit to generate an arc on an object to be welded. In addition, the welding torch receives shielding gas from the gas supply unit and sprays it onto the object to be welded. That is, it is possible to spray the damaged portion of the truck loading box (C) and the reinforcing plate (P), respectively.

On the other hand, the wire supply unit supplies the welding wire (w) functioning as an electrode onto the object to be welded through the welding torch. The wire supply unit may include a wire source providing the welding wire w, and a roller provided between the wire source and the welding torch. At least two rollers are provided, and the welding wire w is supplied in the direction of the welding torch through the two rollers. The wire supply unit may supply the welding wire w at a constant speed. That is, the welding wire w can be supplied at a predetermined speed according to the rotational speed of the roller. Of course, the wire supply unit may adjust the supply speed of the welding wire (w) according to the size of the generated arc and applied power. For example, the wire supply unit may supply the welding wire w at a speed of 2 to 30.5 m/min. On the other hand, the welding wire (w) supplied from the wire supply unit may be selected according to the composition of the metal to be welded, process conditions, and the like. The welding wire (w) melts at a high temperature during welding and welds a to-be-welded object, greatly affects the mechanical properties of welding and is a key factor in welding quality. The weld metal shall have mechanical properties similar to those of the base material and be free from defects such as discontinuities, inclusion of contaminants or pores in the weld. For this purpose, welding wires w of various materials may be used. For example, the welding wire w may include stainless steel, gold, silver, copper, titanium, iron, or the like. In addition, at least two or more metal alloys may be used for the welding wire (w). In addition, the welding wire (w) may have a diameter of 0.7 mm to 5 mm depending on process variation, welding size, welding material, and the like.

The power supply unit supplies power to weld the object to be welded. The power supply unit may supply power to the welding torch and the object to be welded. For example, ground power may be supplied to the object to be welded, and a pulsed welding waveform may be supplied to the welding torch. The welding waveform can be a DC or AC pulse waveform, either type can be used.

The gas supply unit supplies shielding gas to a space where welding is performed. That is, the gas supply unit supplies shielding gas to the welding torch, and the shielding gas is injected through the welding torch into a space where welding is performed. Shielding gases are required to shield the weld area from atmospheres such as nitrogen and oxygen, which can cause fusion defects, porosity and weld metal embrittlement when in contact with the arc or weld. The gas supply unit may supply a shielding gas including an active gas, an inert gas, and carbon dioxide. Of course, the gas supply unit may supply a mixed gas, for example, a mixed gas of an inert gas such as argon and carbon dioxide.

The welding torch of the welder 111 may include a torch body 111a, a gas diffuser 111b, a nozzle 111c and a contact tip 111d.

The torch body 111a accommodates the other components of the welding torch. To this end, the torch body 111a may be provided in a tubular shape with a space therein, and a gas diffuser 111b may be connected to the front end of the torch body 111a. At this time, the connection between the torch body 111a and the gas diffuser 111b may use, for example, screw coupling. However, it is not limited thereto, and other means for coupling and disengagement may be applied. In addition, in order to protect the gas diffuser 111b connected to the torch body 111a, an insulator 111e formed to surround the gas diffuser 111b may be further connected to the torch body 111a. For example, the inside of the torch body 111a may be connected to the gas diffuser 111b and the outside of the torch body 111a may have a shape connected to the insulator 111e. In addition, the nozzle 111c may be combined with the gas diffuser 111b, for example, it may be screwed.

The gas diffuser 111b is mounted inside the torch body 111a to supply shielding gas and welding wire w. Here, the gas diffuser 111b may receive the shielding gas and the welding wire w from the torch body 111a and supply them to the nozzle 111c and the contact tip 111d, respectively. That is, the welding wire w supplied from the wire supply unit is exposed to the outside through through-holes formed in the inner centers of the torch body 111a, the gas diffuser 111b, and the contact tip 111d, and the shield supplied from the gas supply unit. The gas is supplied to the nozzle 111c through the torch body 111a and the gas diffuser 111b.

In addition, the gas diffuser 111b may be coupled with the nozzle 111c and coupled with the contact tip 111d. That is, in the gas diffuser 111b, one region may be coupled to the torch body 111a, and the nozzle 111c and the contact tip 111d may be coupled to the other region. To this end, the gas diffuser 111b may include three areas with different diameters. For example, the outer side of the first area having a first diameter may be coupled to the inner side of the torch body 111a, and adjacent to the first area, a nozzle on the outside of the second area having a second diameter smaller than the first diameter. (111c) may be coupled, and a contact tip (111d) may be coupled to the inside of a third region having a third diameter smaller than the second diameter adjacent to the second region. At this time, the coupling of the torch body 111a and the gas diffuser 111b and the coupling of the gas diffuser 111b and the nozzle 111c and the contact tip 111d may use screw coupling. Accordingly, separation and coupling of the torch body 111a, the gas diffuser 111b, the nozzle 111c, and the contact tip 111d may be facilitated.

The nozzle 111c is coupled to the gas diffuser 111b and sprays the shielding gas supplied from the gas diffuser 111b to the welding portion of the object to be welded. Here, the nozzle 111c has a tube shape in which a space through which shielding gas can be discharged is formed, and a contact tip 111d may be positioned at the center thereof. That is, the nozzle 111c may be spaced apart from the contact tip 111d and surround the contact tip 111d. Thus, the shielding gas can be discharged to the welding position of the object to be welded through the space between the nozzle 111c and the contact tip 111d. In addition, since the nozzle 111c is formed to surround the contact tip 111d adjacent to the contact tip 111d, welding defects due to wind or the like are prevented and the welding wire w is stable to the contact tip 111d. The welding position can be protected by discharging shielding gas so that the welding operation can be performed.

The contact tip 111d supplies the welding wire w to the welding position of the object to be welded and supplies power. Here, the contact tip 111d may be mounted on the gas diffuser 111b and positioned inside the nozzle 111c. Therefore, the shielding gas can be discharged to the outer surface of the contact tip 111d and the welding wire w can be discharged to the inner surface of the contact tip 111d. In addition, the contact tip 111d discharges the welding wire w to the welding position of the object to be welded, and power is supplied to generate an arc between the welding position of the object to be welded and the welding wire w. The welding wire w is melted by this arc, so that the object to be welded can be welded. For example, two separated objects to be welded may be joined by welding. Meanwhile, although not shown, a pressing member 111dc may be provided to press the contact tip 111d and the welding wire w so that they come into contact with each other.

Meanwhile, through-holes are formed in central portions of the torch body 111a, the gas diffuser 111b, and the contact tip 111d, and the welding wire w is discharged through the through-holes. The welding wire (w) functions as an electrode so that an arc is generated on the object to be welded according to the power supplied from the power supply so that the object to be welded is welded. That is, the damaged portion of the truck loading box (C) and the reinforcing plate (P) can be welded to be bonded to each other.

The contact tip 111d includes a tip body 111da, a connection portion 111de provided at one end of the tip body 111da, a cutout 111db provided in at least one region of the tip body 111da, and at least a portion of the tip body 111da. It may include a pressing member 111dc that contacts the main body 111da and presses the welding wire w. Here, at least a part of the cutout 111db is formed to expose the welding wire w, and the pressing member 111dc presses the welding wire w through the cutout 111db. Therefore, the welding wire (w) is pressed by the pressing member (111dc) so that the contact between the welding wire (w) and the tip body (111da) can be maintained.

The tip body 111da may be provided in a substantially cylindrical shape. In addition, at least a portion of the tip body 111da may be provided in an inclined shape. For example, the tip body 111da may be provided in a cylindrical shape with a predetermined length in one direction opposite to the area in contact with the connection portion 111de, and from this, the predetermined length may be provided in a gradually decreasing angle. Meanwhile, the tip body 111da may be formed of a copper material. However, the tip body 111da is not limited thereto and may be formed of a material other than copper.

The connection part 111de may be provided at one end of the tip body 111da. That is, the connection part 111de may be connected to the gas diffuser 111b and provided at one end of the tip body 111da so that the contact tip may be fixed. This connecting portion 111de may be provided with a smaller diameter than the diameter of the tip body 111da. Meanwhile, the connection portion 111de may be made of the same material as the tip body 111da.

The cutout 111db may be formed in at least one area of the tip body 111da. In addition, at least a portion of the cutout 111db may be formed such that the welding wire w is exposed.

The pressing member 111dc may be provided to press the welding wire w provided in the through hole. As the pressing member 111dc presses the welding wire w, the welding wire w may come into contact with the tip body 111da without being shaken. The pressing member 111dc contacts at least a portion of the tip body 111da and presses the welding wire w through at least a portion of the cutout 111db formed in the tip body 111da. In addition, a portion of the pressing member 111dc is in contact with the connecting portion 111de. That is, the pressing member 111dc is fixed to the connecting portion 111de, extends in contact with the tip body 111da, and is accommodated in the cutout 111db to partially press the welding wire w.

In addition, the contact tip includes a tip body 111da, a connecting portion 111de, a cutout 111db, and a pressing member 111dc, and an insertion member 111dd provided between the welding wire w and the pressing member 111dc. ) may further include.

The insertion member 111dd is inserted into the cutout 111db and is pressed by the pressing member 111dc accommodated in the first cutout 131 . That is, the insertion member 111dd forms at least one contact with the pressing member 111dc, and the insertion member 111dd and the welding wire w are pressed by the pressing member 111dc. The insertion member 111dd may be provided in a substantially rectangular plate shape having a predetermined thickness. That is, the insertion member (111dd) has a predetermined length in the longitudinal direction of the welding wire (w) based on the welding wire (w), and has a predetermined width (ie width) in the upper direction of the welding wire (w), It has a predetermined thickness in a direction orthogonal to the traveling direction of the welding wire w. In this case, the thickness of the insertion member 111dd may be equal to or smaller than the cutout 111db, the length may be equal to or shorter than the cutout 111db, and the width may be smaller than or equal to the depth of the cutout 111db. have. Thus, the insertion member 111dd may not be exposed to the outside of the tip body 111da. Meanwhile, the insertion member 111dd may be made of a material having lower resistance than the contact tip, that is, the tip body 111da, for example, copper. Also, current may be supplied through the insertion member 111dd. That is, since current is supplied through not only the contact tip but also the insertion member 111dd, resistance and heat generation are reduced, and thus the hole expansion speed is reduced, so that life can be extended.

The video camera 112 may generate image data by photographing the top of the truck loading box (C).

Here, the image camera 112 may include a line scan camera 112a of a CCD type that scans the top of the truck loading box.

The scan time of the line scan camera 112a may be set to a time set in the line scan camera itself or a time provided from a detector.

That is, the video camera 112 processes the image data generated by photographing the upper portion of the truck loading box (C) and provides information on the size and location of the damaged part formed on the upper portion of the truck loading box (C) to determine the top of the truck loading box (C). Formed and damaged parts can be accurately and precisely detected.

The detector 113 is connected to the imager 112 and receives image data generated by the imager 112 to detect the damaged portion formed on the top of the truck box C.

At this time, the detector 113 is connected to the processing module 113a that collects and processes image data generated by the imager 112 and outputs processing information, and is connected to the processing module 113a to receive processing information and detecting programs. A display module 113b for externally displaying a detection result corresponding to processing information may be included.

The processing module 113a may be applied with a PC for a camera, receive pixel values corresponding to the bottom edge lines of the truck loading box C from the video camera 112 in units of lines, and the number of received lines corresponds to the set number of lines. When it arrives, it may include a frame grabber that transmits processing information corresponding to the set number of lines to the display module 113b. In this case, the frame grabber may include an image frame as the processing information.

In addition, transmission of processing information from the frame grabber to the indicator may be performed through TCP/IP communication or User Datagram Protocol (UDP) communication.

In addition, the display module 113b may be applied with a human machine interface (HMI) PC, which is an industrial computer, and a data acquisition (DAQ) board for processing analog signals and digital signals, and trigger pulses of the analog signals It may include a frequency converter (V / F Converter) that converts to and transmits it to the processor.

Referring to FIGS. 6 and 7 , the controller 114 has one side connected to the welder 111 and the other side connected to the rail unit 120 and may tilt the welder 111 at a predetermined angle. That is, the controller 114 may tilt the welder 111 in a clockwise or counterclockwise direction relative to the width direction (a direction perpendicular to the horizontal direction with respect to the extension direction described above). The regulator 114 connects the first body 114a coupled to the welding machine 111, the second body 114b coupled to the rail unit 120, and the first body 114a and the second body 114b. It may include a plurality of connecting bodies (114c) to do.

Here, the second body 114b may be provided as a cylinder capable of extension and contraction, and is coupled to the bearing 128 of the rail unit 120 to be described later, so that the extension direction is the central axis by the rotation of the bearing 128. It can rotate along the circumference of a circle.

The connector 114c may have one end connected to the first body 114a and the other end connected to the second body 114b in the width direction. In addition, at least a portion of the connecting body 114c may be formed to be tiltable. That is, at least a portion of the connector 114c may be provided to be bent to the left or right with respect to the width direction. The connecting body 114c may include a plurality of corrugated pipes 114ca and 114cb and a plurality of cylinders 114cc and 114cd.

The plurality of corrugated pipes 114ca and 114cb may have one end coupled to the first body 114a and the other end coupled to the second body 114b. A plurality of corrugated tubes 114ca and 114cb have a plurality of corrugations formed on at least a portion thereof, so that they can be easily stretched or contracted or bent. In addition, the lengths of the plurality of corrugated pipes 114ca and 114cb may be adjusted along the width direction. Therefore, even if the first body 114a and the second body 114b are not located on the same line, the plurality of corrugated pipes 114ca and 114cb can connect the first body 114a and the second body 114b. . In addition, the plurality of corrugated pipes 114ca and 114cb can absorb external impact, and even if the user's hand shakes slightly, the vibration can be suppressed from being transmitted to the second body 114b and the welder 111. have.

In the following, a case in which a plurality of corrugated pipes 114ca and 114cb are provided as a pair and spaced apart from each other in the vertical direction will be described as an example. On the other hand, in the following, a corrugated tube located relatively upper among the plurality of corrugated tubes 114ca and 114cb is referred to as one corrugated tube 114ca, and a corrugated tube located relatively lower is referred to as another corrugated tube 114cb.

Meanwhile, the plurality of corrugated pipes 114ca and 114cb may be provided in a bellows structure so that at least a part thereof can absorb shock.

The plurality of cylinders 114cc and 114cd are respectively disposed inside the plurality of corrugated pipes 114ca and 114cb, one end of which is rotatably coupled to the first body 114a, and the other end to the second body 114b. It is fixedly coupled and may be formed to be stretchable and contractible along the width direction. The plurality of cylinders 114cc and 114cd may be hinged to the first body 114a and the second body 114b, respectively. In the following, a relatively upper cylinder among the plurality of cylinders 114cc and 114cd is referred to as one cylinder 114cc, and a relatively lower cylinder is referred to as another cylinder 114cd. That is, one cylinder 114cc may be disposed inside one corrugated pipe 114ca, and the other cylinder 114cd may be disposed inside the other corrugated pipe 114cb.

A plurality of cylinders (114cc, 114cd) may be provided with a buffer member (not shown) provided at least part of the inside of the elastic material. The buffer member (not shown) may be made of, for example, silicon or rubber, or made of a flexible material. Therefore, through the above-mentioned buffer member (not shown), even if the user's hand shakes slightly, the weight member absorbs the shaking, and the vibration is suppressed from being transmitted to the second body 114b and the welding machine 111. can

One cylinder (114cc) may be driven by, for example, a first button (not shown). One cylinder (114cc) is electromagnetically connected to the first button (not shown), and can send and receive signals. Accordingly, one cylinder 114cc may be extended or contracted by a signal transmitted from a first button (not shown). In addition, the other cylinder 114cd may be driven by a second button (not shown). The other cylinder 114cd is electromagnetically connected to the second button (not shown) and can send and receive signals. Accordingly, the other cylinder 114cd may be extended or contracted by a signal transmitted from a second button (not shown).

On the other hand, the distance between one cylinder (114cc) and the other cylinder (114cd) (based on the vertical direction) is, based on when one cylinder (114cc) and the other cylinder (114cd) are contracted, one cylinder (114cc) And the case of being formed to 1/2 the length of the width direction of the other cylinder (114cd) will be described as an example.

As shown in FIG. 6(b), when one cylinder 114cc is contracted and the other cylinder 114cd is extended, the second body 114b may be tilted upward in the width direction. On the other hand, when one cylinder 114cc is extended and the other cylinder 114cd is contracted, the second body 114b may be tilted downward based on the width direction.

Here, the plurality of cylinders 114cc and 114cd may rotate the second body 114b within a range of more than 30° and less than 45° with respect to the first body 114a, and may be placed in a rotated state. To this end, the plurality of cylinders 114cc and 114cd is a ratio of the contracted length of one cylinder (eg, one cylinder 114cc) to the extended length of any one cylinder (eg, the other cylinder 114cd). may be formed to be greater than 0.3 and less than 0.5. That is, the range of the contracted length of one cylinder 114cc may be formed within a range of a difference value of greater than tan30 to tan45 based on the length value of the extended length of the other cylinder 114cd. For example, assuming that the length between one cylinder 114cc and the other cylinder 114cd is 1 cm, the length in the width direction of one cylinder 114cc and the other cylinder 114cd may be 2 cm, and one cylinder 114 cc ) may be formed in the range of greater than 1 cm * tan30 to 1 cm * tan45. Accordingly, when the contracted length of the other cylinder 114cd is calculated as a ratio, (2cm - 1cm * tan30) / 2cm (ie, an approximate value of 0.3) to (2cm - 1cm * tan30) / 2cm ( That is, it may be formed at a ratio of 0.5).

Therefore, the operator can extend or contract the one cylinder 114cc and the other cylinder 114cd, respectively, using the first button (not shown) and the second button (not shown), and the welder 111 watches the watch. It can be tilted in a direction or counterclockwise direction. Accordingly, the welding machine 111 may proceed with the welding operation by more precisely approaching the damaged portion of the reinforcing plate P and the truck loading box C.

Meanwhile, one cylinder 114cc and the other cylinder 114cd may be tilted by a separately provided control module (not shown). The control module is electromagnetically connected to the image camera 112 and the detector 113, and based on the data detected by the image camera 112 and the detector 113, the welder 111 is connected to the reinforcing plate P and It can be brought as close as possible to the damaged part of the truck loading box (C). Accordingly, the welder 111 may proceed with the welding operation by more precisely approaching the damaged portion of the reinforcing plate P and the truck loading box C.

The rail part 120 forms a moving path of the welding part 110 and may extend along the extension direction of the truck loading box (C). The rail unit 120 includes a rail member 121, a case 122, a pinion gear 123, a first motor 124, a second motor 125, a first bevel gear 126, a second bevel gear ( 127) and bearings 128.

Referring to FIG. 4 , the rail member 121 may extend in an extension direction and be movably coupled to an upper portion of the movable unit 130 in a width direction perpendicular to the extension direction horizontally. The rail member 121 may move in the width direction along an auxiliary rail (not shown) formed along the width direction of the seating plate 135 of the moving unit 130 .

In addition, the rail member 121 may include a guide groove 121a recessed inward at an upper portion thereof and a rack gear 121b formed in the guide groove 121a. The guide groove 121a extends along the extension direction, and a protruding piece 122a of the case 122 to be described below may be inserted into the guide groove 121a.

The rack gear 121b may be a plurality of gear teeth formed along the extension direction on the inner surface of the rail member 121 forming the guide groove 121a. The rack gear 121b may be meshed with a pinion gear 123 to be described later.

The case 122 is disposed above the rail member 121 and can move forward and backward along the extending direction. The case 122 may have a protruding piece 122a and a recessed groove 122b fitted into the guide groove 121a at a lower portion thereof.

The pinion gear 123 may be disposed inside the case 122 and meshed with the rack gear 121b. That is, when the pinion gear 123 receives rotational driving force from the first motor 124 to be described later and rotates in mesh with the rack gear 121b, the case 122 can be moved forward and backward in the extending direction.

The first motor 124 is coupled to the inside of the case 122, is disposed along the width direction, is coaxially coupled to the pinion gear 123, and may generate rotational driving force. That is, the first motor 124 may rotate the pinion gear 123 .

The second motor 125 is disposed along the vertical direction, is coupled to the inside of the case 122, and can generate rotational driving force. The second motor 125 may rotate a first bevel gear 126 to be described later.

The first bevel gear 126 is coaxially connected to the second motor 125, its width decreases from the upper side to the lower side, and may have gear teeth on its outer circumferential surface. Here, at least a part of the first bevel gear 126 protrudes to the outside of the case 122 and may be meshed with the second bevel gear 127 to be described later. That is, the first bevel gear 126 may rotate by receiving rotational driving force from the second motor 125 and rotate the second bevel gear 127 .

The second bevel gear 127 is disposed along the extension direction, its width decreases along the extension direction, has gear teeth on its outer circumferential surface, and may be meshed with the first bevel gear 126.

The bearing 128 may be coaxially coupled to the second bevel gear 127, rotatably supported on an outer wall of the case 122, and coupled to the welding portion 110. That is, as described above, the bearing 128 rotates by the second bevel gear 127 and moves the second body 114b and the welder 111 in the circumferential direction (ie, the circumference of a circle having the extension direction as the central axis). direction) can be rotated. Thus, the welding machine 111 can rotate clockwise and counterclockwise inside the truck loading box C, and can weld the left and right sides inside the truck loading box C.

The movable unit 130 can travel in an extension direction, the rail unit 120 is seated on the upper portion to be movable in the width direction, and at least a part thereof can be formed to be movable vertically. That is, the moving unit 130 may move the rail unit 120 and the welding unit 110 to the upper side of the reinforcing plate P seated on the bottom surface of the truck loading box C. The moving unit 130 may include a moving unit body 131, a roller 132, a connecting member 133, a driving member 134, a seating plate 135, and a support member 136.

The moving unit body 131 may be movably disposed on the upper side of the workshop floor. Here, the movable unit body 131 may be provided with a second guide rail 131a for moving at least a portion of the connecting member 133 in the extension direction. The moving unit body 131 includes a second guide rail 131a, a second fixing bracket 131b, and a second movable bracket 131c movably coupled to the second guide rail 131a along the extending direction. can be provided.

A plurality of rollers 132 are provided and may be rotatably coupled to the lower part of the moving unit body 131 . That is, the roller 132 may move the movable body 131 forward and backward along the extension direction on the workshop floor.

The connecting member 133 is formed to be flexible in the vertical direction, and receives driving force from a driving member 134 to be described later to move the seat plate 135 up and down (ie, rise and fall).

The connection member 133 may include a plurality of connection links 133aa and 133ab rotatably connected by a connection pin 133b. At this time, the connection link 133a may be formed by assembling two connection links 133aa and 133ab formed in a long bar shape or plate shape in an “X” shape.

The connection member 133 may be formed by rotatably connecting a plurality of connection links 133aa and 133ab with a connection pin 133b. At this time, the connection pins 133b are located at the center of the connection links 133aa and 133ab where the two connection links 133aa and 133ab overlap, and at both ends of the connection links 133aa and 133ab connected to the other connection links 133a. each can be connected. This 　 connecting member 133 can be expanded or contracted in the vertical direction according to the angle formed by the two connecting links 133aa and 133ab.

Among the plurality of connecting links 133a constituting the connecting member 133, the link portion provided at the lowest part, for example, the lower connecting link 133a, is connected to the upper part of the moving unit body 131 and is provided at the uppermost part. The part, for example, the upper connection link 133a may be connected to the lower surface of the second guide rail 131a. At this time, one of the two connection links 133aa and 133ab constituting the lower connection link 133a is rotatably connected to the upper part of the movable body 131 through the second fixing bracket 131b, and the other one It can be movably connected to the second guide rail 131a through the 2 movable brackets 131c.

In addition, one of the two connection links 133aa and 133ab constituting the upper connection link 133a is rotatably connected to the lower surface of the first guide rail 135a through the first fixing bracket 135b, and the other one may be movably connected to the first guide rail 135a through the first moving bracket 135c.

The driving member 134 may provide power for extending or contracting the connecting member 133 and may include a driving shaft 134a capable of linear motion. At this time, one end of the driving shaft 134a is connected to the driving member 134, and the other side is rotatable to one of the connecting links 133aa and 133ab among the plurality of connecting links 133aa and 133ab constituting the connecting member 133. can be connected to In addition, the driving member 134 may be rotatably connected to the upper part of the moving unit body 131 .

Through this configuration, when the driving shaft 134a is linearly moved by operating the driving member 134, the connecting member 133 elongates or rises as shown in FIG. 135), the rail part 120, and the welding part 110 can be moved in the vertical direction.

The seating plate 135 may form an auxiliary rail (not shown) extending in the width direction at an upper portion thereof, and the rail portion may be movably coupled to the auxiliary rail and supported by the connecting member 133 . Here, the auxiliary rail forms a path through which the rail unit 120 can move along the width direction, and may be provided as, for example, a slide rail. The seating plate 135 has a first guide rail 135a, a first fixing bracket 135b, and a first movable bracket 135c movably coupled to the first guide rail 135a along the extending direction at a lower portion thereof. can be provided

As shown in FIG. 6, the support member 136 is formed to be stretchable and contractible so that its length can be varied in conjunction with the extension and contraction of the connecting member 133, and one end is rotatable on the seating plate 135. It is tightly coupled and the other end can be supported on the floor of the workshop. The support member 136 may include a support cylinder 136a and an auxiliary cylinder 136b.

The support cylinder 136a is extensible and contractible, one end of which is rotatably coupled to the end of the seat plate 135 (that is, the part where the rail part 120 protrudes from the seat plate 135), and the other end thereof is connected to the workplace. It may be formed to be in surface contact with the floor. The support cylinder 136a has a friction pad 136aa rotatably coupled to the other end thereof, so that it can come into surface contact with the floor of the workplace. That is, when the connecting member 133 is contracted, the support cylinder 136a may be in a state of being spaced apart from the workplace floor, that is, floating by the seating plate 135 and the auxiliary cylinder 136b to be described later. On the other hand, when the connecting member 133 is extended, the support cylinder 136a is also extended, and its overall length can be increased, so that the friction pad at the other end of the support cylinder 136a ( 136aa) rotates relative to each other and can be supported on the bottom surface. Accordingly, the supporting member 136 supports the seating plate 135, and thus, it is possible to prevent the moving part 130 from tilting due to the load of the rail part 120 and the welding part 110.

The auxiliary cylinder 136b may have one end rotatably coupled to the support cylinder 136a and the other end rotatably coupled to an end of the moving unit body 131 . The auxiliary cylinder 136b may distribute the load applied to the support cylinder 136a.

To this end, the auxiliary cylinder 136b is coupled with a left-hand screw or a right-hand screw method by penetrating the length adjusting member 136ba extending to have a predetermined length and the lower part of the length adjusting member 136ba in the vertical direction, and one end thereof is supported A first length-adjusting shaft 136bb rotatably coupled to the cylinder 136a and the other end passing through one end of the length-adjusting member 136ba and coupled in a right-handed, left-handed or right-handed manner, one end of which is a moving unit body (131) is rotatably coupled to the second length adjusting shaft (136bc) and the support cylinder (136a), the other end of which passes through the other end of the length adjusting member (136ba) and is coupled in a right-handed, left-handed or right-handed manner. It is electromagnetically connected and may include a power motor 136bd coupled to the length adjusting member 136ba to rotate the length adjusting member 136ba in conjunction with driving the support cylinder 136a. Here, the power motor 136bd may be operated in conjunction with the support cylinder 136a by exchanging electromagnetic signals.

That is, when the support cylinder 136a drives and rotates the moving part body 131, the power motor 136bd corresponds to the moving part body 131 spaced apart from the support cylinder 136a, and the length adjusting member 136ba ) can be rotated. Accordingly, the first length adjusting shaft 136bb and the second length adjusting shaft 136bc rotate and move away from each other with respect to the length adjusting member 136ba, and the support cylinder 136a and the movable body have a distance therebetween. (131) between the support cylinder (136a) and the moving unit body 131 can be supported, respectively. Therefore, the moving part body 131 can be supported from the lower side through the auxiliary cylinder 136b, and the lowering of the moving part body 131 by the load of the object P can be suppressed or prevented. have. For example, the auxiliary cylinder 136b may include a turn buckle.

In this way, the reinforcing plate may be seated on the truck loading box, and the damaged portion of the truck loading box may be mainly welded to the truck loading box and the reinforcement plate. Accordingly, while attaching the reinforcing plate to the truck loading box, it is possible to repair the damaged portion of the truck loading box. In addition, since the rail part moves in the width direction on the truck loading box and the welding part rotates in the circumferential direction, the reinforcing plate can be welded to the truck loading box of various sizes regardless of the size of the truck loading box. In addition, since the welding part is formed to be tiltable, it is possible to more precisely weld the damaged part.

Although the embodiments of the present invention have been described in more detail with reference to the accompanying drawings, the present invention is not necessarily limited to these embodiments, and may be variously modified and implemented without departing from the technical spirit of the present invention. . Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Therefore, other implementations, other embodiments, and equivalents of the claims are within the scope of the following claims.

100: Welding device for truck loading box reinforcement 110: Welding part
120: rail part 130: moving part
T: Truck P: Reinforcement plate
C: truck bed

Claims (3)

As a welding device for fixing an object to be welded on a truck loading box,
a welding part for welding the object to be welded to the bottom surface of the truck loading box;
a rail part forming a movement path of the welding part and extending along the extending direction of the truck loading box; and
A movable part capable of traveling in the extension direction, on which the rail part is movably seated, and at least a part of which is movable up and down; includes;
At least a part of the rail part is formed to be movable along the extension direction, and coupled to the weld part to be relatively rotatable, so that the weld part can be linearly driven or rotated along the circumferential direction along the extension direction.
The welding unit is configured to photograph the truck loading box on the truck loading box to generate image data, receive the generated image data, and detect and weld a position where the object to be welded is to be welded,
The welding part,
a welder capable of applying heat to the object to be welded so as to melt a part of the object to be welded and disposed inclined downward with respect to the rail portion;
An image camera coupled to the welding machine and generating image data by photographing the top of the truck loading box;
a detector electromagnetically connected to the imaging device, coupled to the welding device, receiving image data generated by the imaging device and detecting a damaged portion on the truck loading box; and
an adjuster having one side rotatably supported by the rail unit, the other side coupled to the welding machine, and at least a part of which is formed to be tingting;
The video camera,
A CCD-type line scan camera that scans along an extension direction and transmits pixel values corresponding to a single line line by line; and
Including; at least one or more LEDs to illuminate the truck loading box;
In the line scan camera, the scan time is set to a time set in the line scan camera or a time provided from the detector,
The detector,
a processing module that collects and processes image data generated by the image camera and outputs processed data; and
A display module connected to the processing module to receive the processing data and display a detection result corresponding to the processing data through a detection program;
The detection result includes the size according to the depth of the damaged part and the area of the damaged part, location information of the damaged part, and an image of the damaged part in the location information,
The rail part,
A rail member extending in an extension direction, movably coupled to an upper portion of the movable part in a width direction perpendicular to the extension direction, and having a guide groove recessed inward on the upper portion and a rack gear formed in the guide groove. ;
a case movably disposed above the rail member;
a pinion gear disposed inside the case and meshed with the rack gear;
a first motor coupled to the inside of the case, disposed along the width direction, coaxially coupled to the pinion gear, and generating rotational driving force;
a second motor disposed along the vertical direction and coupled to the inside of the case to generate rotational driving force;
a first bevel gear coaxially connected to the second motor, having a width decreasing from an upper side to a lower side, and having gear teeth on an outer circumferential surface of the first bevel gear;
a second bevel gear disposed along an extending direction, having a reduced width along an extending direction, having gear teeth on an outer circumferential surface thereof, and meshing with the first bevel gear;
A bearing coupled coaxially with the second bevel gear, rotatably supported on the outer wall of the case, and coupled to the welded portion,
the controller,
a first body coupled to the bearing, rotatable along the circumferential direction in conjunction with rotation of the bearing, and formed to be stretchable and contractible along the radial direction;
a second body coupled to the welding machine and disposed in a rotated state within a range of more than 30° and less than 45° with respect to the first body; and
A connection body having one end connected to the first body and the other end connected to the second body, and at least a portion of which is formed to be tiltable;
The linkage,
a plurality of corrugated pipes connecting the first body and the second body; and
It is disposed inside the plurality of corrugated tubes, is rotatably coupled to the first body, and the other end is rotatably coupled to the second body, so that its length can be adjusted along the radial direction. Including; a plurality of cylinders formed to be contractible;
When any one of the plurality of cylinders is extended, the other cylinder disposed opposite to the one cylinder is contracted,
The ratio of the contracted length of the other cylinder to the extended length of any one cylinder is formed to be greater than 0.3 and less than 0.5. delete delete

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