JP2016078096A - Weld jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weld jig which can be used when forming a frame of a construction machine of which a bottom plate is projected and extended from a bottom edge of a vertical plate, and which can be easily withdrawn from the vertical plate after the bottom plate and the vertical plate are welded to each other.SOLUTION: A weld jig 50 includes a base 52 on which a bottom plate 36 is loaded, inner support means 54 interposed between a pair of vertical plates 38, and outer support means 56 which is brought into contact with an outside surface of each vertical plate 38. Each outer support means 56 includes a strut 62 which is provided upright on the base 52, an arm member 64 connected to the strut 62, and a contact member 66 connected to the arm member 64. The arm member 64 is rotatable between an action position at which the arm member is extended from the strut 62 towards the outside surface of the vertical plate 38 and a non-action position at which an extended end is separated from the outside surface of the vertical plate 38. The contact member 66 is capable of freely inclining between an action position at which the contact member is extended along the outside surface of the vertical plate 38 and a non-action position at which the contact member is tiltable to a width direction outer side and is extended from a lower end towards an upper end.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a welding jig used when a frame of a construction machine is formed by welding an upper surface of a bottom plate and a lower end of a pair of vertical plates positioned on the bottom plate at intervals in the width direction.

  In general, a hydraulic excavator, which is a typical example of a construction machine, is a self-propelled lower traveling body, an upper revolving body that is pivotably mounted on the lower traveling body, and a work that is connected to the upper revolving body so as to be able to move up and down. It is generally composed of an arm device. The upper revolving structure includes a revolving frame that forms a framework structure, and the revolving frame is disposed on a center frame extending in the front-rear direction, a right side frame disposed on the right side of the center frame, and a left side of the center frame. And a left side frame.

  The center frame includes a bottom plate, a pair of left and right vertical plates standing on the bottom plate at intervals in the width direction, an inclined plate disposed at a front portion between the vertical plates, and an intermediate portion between the vertical plates. And a plurality of horizontal plates arranged at intervals in the front-rear direction up to the rear portion, and the bottom plate extends outwardly in the width direction from the lower end of the vertical plate. The lower end of each vertical plate, the lower end of the inclined plate, and the lower end of each horizontal plate are joined to the upper surface of the bottom plate by welding, respectively, and both side ends of the inclined plate and both side ends of each horizontal plate are each vertical plate. It is joined to the inner surface by welding.

  When the members of the center frame are welded to each other, the members are positioned by a welding jig. The welding jig includes a base on which the bottom plate is placed, inner support means interposed between the vertical plates, and a pair of outer support means that come into contact with the outer surface of each vertical plate. The inner support means is composed of a rod-shaped member, and each of both end portions in the longitudinal direction of the rod-shaped member is brought into contact with the inner surface of each vertical plate. The outer support means includes a plate-like member that is disposed perpendicularly to the vertical plate and that has a contact portion that contacts the outer surface of the vertical plate and extends in the vertical direction along the outer surface of the vertical plate.

  When the upper surface of the bottom plate and the lower end of each vertical plate are welded, the bottom plate and each vertical plate are positioned by a welding jig, but the vertical plate is moved in the width direction from the lower end toward the upper end due to thermal strain generated in the welded portion. It may be slightly inclined outward. In this case, since the plate-like member of the outer support means is pressed from the vertical plate, the operator cannot easily remove the outer support means from the vertical plate, and the operator can remove the plate-like member with a hammer. There is a problem that the outer support means must be detached from the vertical plate by hitting or the like, which requires time and effort and damages the plate-like member.

  A welding jig used to position a member constituting a frame of a construction machine when the members are welded to each other even when the member is pressed from the member due to thermal strain. Although there is no document that discloses a material that can be easily detached from the above, in Patent Document 1 below, the members constituting the roof unit of a house are welded together in order to position those members. A welding jig to be used that is easily detached from a member even when it is pressed from the member by thermal strain or the like is disclosed.

  The welding jig disclosed in Patent Document 1 includes a toggle mechanism disposed on both sides of a member of the roof unit, a position regulating plate that is raised and lowered by the forward and backward movement of the toggle mechanism on one side, and a toggle clamp mechanism on the other side. And a pressing plate disposed at the tip. According to this welding jig, the members of the roof unit are separated from both sides by the position restricting plate that is erected by the advancement of the toggle mechanism on one side and the pressing plate that is advanced by the advancement of the toggle mechanism on the other side. Positioning is performed in the sandwiched state. Then, after the members are welded to each other, the position restricting plate collapses by retreating the toggle mechanism on one side, and the pressing plate is retreated by retreating the toggle mechanism on the other side. Since it moves backward, it is easily detached from the member even when it is pressed from the member due to thermal strain.

Japanese Utility Model Publication No. 5-18786

  In the welding jig disclosed in Patent Document 1, since the position restricting plate is disposed on the slide plate on which the member is placed so as to be able to be raised and lowered via the hinge, the bottom plate is arranged from the lower end of the vertical plate. The center frame of the hydraulic excavator that protrudes outward in the width direction cannot contact the outer surface of the vertical plate because the hinge and the position restricting plate interfere with the side edge of the bottom plate, and the center frame It cannot be used as a welding jig when forming.

  The present invention has been made in view of the above-mentioned facts, and a main technical problem thereof includes a bottom plate and a pair of vertical plates positioned on the bottom plate at intervals in the width direction, and the bottom plate is a lower end of the vertical plate. Can be used to form the frame of a construction machine that protrudes outward in the width direction, and is welded easily after it is detached from the vertical plate after the upper surface of the bottom plate and the lower end of the vertical plate are welded It is to provide a jig.

  According to the present invention, as a welding jig that solves the above technical problem, the upper surface of the bottom plate and the lower ends of a pair of vertical plates positioned on the bottom plate at a distance in the width direction are welded. A welding jig used when forming a frame, a base on which the bottom plate is placed, an inner support means interposed between the pair of vertical plates, and an outer surface of the pair of vertical plates, respectively Each of the pair of outer support means, and each of the pair of outer support means is connected to a support column erected on the base and a base end portion is pivotably connected to the upper end side of the support column. And an abutting member that is tiltably connected to the extending end of the arm member, the arm member extending from the column toward the outer surface of the vertical plate, and the extension The protruding end is pivotable between a non-acting position away from the outer surface of the vertical plate, and the contact member extends along the outer surface of the vertical plate. It is tiltable between an inoperative position extending inclined from location and the lower or upper end outward in the width direction toward the upper or lower end, the welding fixture is provided, characterized in that.

  Preferably, the arm member is releasably restrained at the operating position. Conveniently, the arm member and the corresponding contact member are connected via a link mechanism including a grip lever that allows the corresponding contact member to be manually tilted. The contact member preferably includes a connection piece connected to the extending end of the arm member and a contact piece detachably attached to the connection piece.

  In the welding jig provided by the present invention, each outer support means includes a support column erected on the base, an arm member whose base end is pivotally connected to the upper end side of the support column, and an arm member An abutting member that is tiltably connected to the extending end of the arm member, the arm member extending from the column toward the outer surface of the vertical plate, and a non-operating position in which the extending end moves away from the outer surface of the vertical plate. The arm member can be used when forming the frame of the construction machine without interfering with the side end portion of the bottom plate that protrudes outward in the width direction from the lower end of the vertical plate.

  In the welding jig according to the present invention, after the upper surface of the bottom plate and the lower end of the vertical plate are welded, the contact member extends from the lower end or the upper end to the upper end from the working position extending along the outer surface of the vertical plate. Alternatively, it is easily detached from the vertical plate by being tilted to a non-acting position extending inclined in the width direction outward toward the lower end.

The side view of a hydraulic excavator. The perspective view which looked at the turning frame shown in FIG. 1 from the upper front. The perspective view which looked at the center frame shown in FIG. 2 from the upper back. The top view of the welding jig comprised according to this invention. Sectional drawing seen from the XX direction in FIG. (A) The perspective view of the outer side support means shown in FIG. 4 in which both an arm member and a contact member are a non-operation position. (B) The perspective view of the outer side support means shown in FIG. 4 in which an arm member is a working position and a contact member is a non-working position. (C) The perspective view of the outer side support means shown in FIG. 4 in which both an arm member and a contact member are an operation position. The front view of the outer side support means shown in FIG.

  Hereinafter, embodiments of a welding jig according to the present invention will be described in detail with reference to the accompanying drawings, taking as an example a swing frame of a hydraulic excavator which is a typical construction machine.

  A description will be given with reference to FIG. The hydraulic excavator indicated as a whole by number 2 is connected to a self-propelled lower traveling body 4, an upper revolving body 6 that is pivotably mounted on the lower traveling body 4, and an upper revolving body 6 that can be raised and lowered. The work arm device 8 is generally configured. The excavator 2 can perform excavation work such as earth and sand when the work arm device 8 is moved up and down and the upper swing body 6 is swung with respect to the lower traveling body 4 during excavation work such as earth and sand. It can be done.

  The work arm device 8 includes a boom 10 that is movably connected to the front side of the upper swing body 6, an arm 12 that is swingably connected to the distal end side of the boom 10, and a pivotable movement toward the distal end side of the arm 12. , A pair of left and right boom cylinders 16 (only the left side is shown), an arm cylinder 18 that swings the arm 12, and a work that rotates the work tool 14. The tool cylinder 20 is generally configured.

  The upper swing body 6 includes a swing frame 22 that forms a framework structure. The swivel frame 22 includes a driver's cab 24 in which an operator is boarded, an engine 26 that serves as a drive source, a counterweight 28 that balances the weight of the work arm device 8, and a fuel tank (not shown) that stores fuel. And a hydraulic oil tank (not shown) for storing the hydraulic oil.

  This will be described with reference to FIG. The turning frame 22 includes a center frame 30 extending in the front-rear direction, a right side frame 32 disposed on the right side of the center frame 30, and a left side frame 34 disposed on the left side of the center frame 30. . A center end of the boom 10 is connected to the center frame 30 at the front, an engine 26 is disposed at the rear, and a counterweight 28 and the like are disposed at the rear of the engine 26. The left and right side frames 32 and 34 are provided with a cab 24, a fuel tank, a hydraulic oil tank, and the like.

  This will be described with reference to FIG. 3 together with FIG. The center frame 30 includes a flat bottom plate 36 extending in the front-rear direction, a pair of left and right vertical plates 38 standing on the bottom plate 36 at an interval in the width direction and extending in the front-rear direction, and a front portion between the vertical plates 38. And a plurality of horizontal plates 42 arranged at intervals in the front-rear direction between an intermediate portion and a rear portion between the vertical plates 38.

  The vertical plate 38 is formed in a triangular shape as a whole, and a boom connecting pin hole 38a to which the base end of the boom 10 is connected via a connecting pin is formed at the top, and the base end of the boom cylinder 16 is connected to the connecting pin at the front end. A boom cylinder connecting pin hole 38b is formed through the connection. The lower end of the vertical plate 38 is joined to the upper surface of the bottom plate 36 by welding. The bottom plate 36 extends outward in the width direction from the lower end of each vertical plate 38, and left and right side frames 32, 34 are welded to the upper surface of the protruding portion of the bottom plate 36 and the outer surface of each vertical plate 38. Be joined.

  The inclined plate 40 is inclined and extended along the front upper end of the vertical plate 38, the lower end is joined to the upper surface of the bottom plate 36 by welding, and both the left and right side ends are respectively connected to the inner surface of each vertical plate 38. They are joined by welding. On the lower end side of the inclined plate 40, a rectangular opening 40a through which a hydraulic pipe (not shown) connected to the boom cylinder 16 is formed is formed. The horizontal plate 42 is erected on the bottom plate 36, the lower end is joined to the upper surface of the bottom plate 36 by welding, and the left and right side ends are joined to the inner surface of each vertical plate 38 by welding.

  A welding jig 50 according to the present invention will be described with reference to FIGS. When the members of the center frame 30 are welded to each other, the members are positioned by the welding jig 50. As shown in FIG. 4, the welding jig 50 includes a base 52 on which the bottom plate 36 is placed, an inner support means 54 interposed between the vertical plates 38, and a pair that comes into contact with the outer surfaces of the vertical plates 38. Outer support means 56.

  In addition to the above, the welding jig 50 includes a bottom plate positioning means for positioning the bottom plate 36 on the base 52, a pin hole positioning means for positioning the boom mounting pin hole 38a of the vertical plate 38, and the bottom plate 36. Members constituting the center frame 30 such as inclined plate positioning means for positioning the inclined plate 40 and horizontal plate positioning means for positioning the horizontal plates 42 on the bottom plate 36 (none of which are shown). Positioning means for positioning.

  This will be described with reference to FIG. The base 52 includes a horizontal surface portion 58 extending substantially horizontally and a plurality of placement portions 60 connected on the horizontal surface portion 58. The horizontal surface portion 58 is formed wider than the bottom plate 36, and an outer support means 56, a pin hole positioning means and the like are connected to the outer edge side. The upper surface of each placement part 60 is formed substantially horizontally and on the same plane, and the bottom plate 36 is placed thereon. The inner support means 54 is composed of a rod-shaped member, and each of both end portions in the longitudinal direction of the rod-shaped member is brought into contact with the inner surface of each vertical plate 38. Each outer support means 56 includes a column 62 erected on the base 52, an arm member 64 that is pivotably connected to the column 62, and a contact member 66 that is tiltably connected to the arm member 64. Including.

  This will be described with reference to FIG. The support column 62 has a rectangular bottom plate 68 formed of a steel plate and a rectangular tube portion 70 formed of a steel material. A plurality of bolt holes 68a extending in the thickness direction are formed on the outer edge side of the bottom plate 68, and the bottom plate 68 is fastened to the horizontal surface portion 58 of the base 52 by bolts inserted through the bolt holes 68a. The rectangular tube portion 70 has a vertical cross section formed in a rectangular shape from a front plate 72 formed of a steel plate and a back plate 74 formed of channel steel and joined to the front plate 72 by welding. The lower end is joined to the upper surface of the bottom plate 68 by welding. A pair of holding pieces 76 extending in the width direction are disposed on the outer surface on the upper end side of the front plate 72 at intervals in the vertical direction, and a semicircular constraining piece 78 is rotatably connected to the upper holding piece 76. Yes. In addition, the square cylinder part 70 may be formed from combinations, such as a flat steel plate and angle steel.

  The arm member 64 is formed of a steel plate, the base end portion is connected to each holding piece 76 of the support 62 by pin coupling, and the extended end is away from the outer surface of the vertical plate 38 (FIG. 6a), It can freely pivot between an action position (FIGS. 6b and 6c) extending from the support 62 to the outer surface of the vertical plate. The upper part 64a and the lower part 64b of the extending end of the arm member 64 are each formed in a bifurcated shape, and the extending end lower part 64b protrudes in the extending direction of the arm member 64 from the extending end upper part 64a. Between the extended end upper parts 64a, the base end part of the grip lever 80 formed in a U-shape from the steel plate is rotatably connected by pin coupling. A pair of link pieces 82 formed of a steel plate are connected to both sides of the top of the grip lever 80 so as to be rotatable by pin coupling. A recess 80a is formed between the base end portion and the top portion of the grip lever 80, and a positioning ball plunger 84 corresponding to the recess 80a is disposed on the extended end upper portion 64a. The ball plunger 84 is biased by an elastic member.

  The contact member 66 includes a connection piece 86 connected to the extending end of the arm member 64 and a contact piece 88 detachably attached to the connection piece 86. The connection piece 86 has a connection part 90 formed in a parallelogram shape from a steel plate and a mounting part 92 formed in a U-shaped cross section from a steel material. The upper portion of the connecting portion 90 is connected to the pair of link pieces 82, and the lower portion of the connecting portion 90 is connected to the extended lower portion 64b of the arm member 64 so as to be rotatable by pin coupling. A contact piece 88 formed of a steel material is fitted in the groove portion of the mounting portion 92 of the connection piece 86, and is detachably fastened by a bolt. The contact piece 88 is formed with a pair of upper and lower contact portions 88 a that protrude in the extending direction of the arm member 64.

  The arm member 64 and the abutting member 66 are connected via a link mechanism, as will be clearly understood by referring to the above description and FIG. A non-operating position (FIGS. 6a and 6b) extending obliquely outward in the width direction toward the upper end, and a position where each contact portion 88a is perpendicular to the horizontal plane portion 58 of the base 52, that is, It is freely tiltable between the action position (FIG. 6c) extending along the outer surface of the vertical plate 38.

  When the center frame 30 is formed by welding the bottom plate 36, the vertical plates 38, the inclined plates 40, the horizontal plates 42, etc., the bottom plate 36 is first placed on the placement portion 60 of the base 52 and the bottom plate is positioned. Positioning is performed by means. At this time, the arm member 64 is positioned at the non-operating position, so that the work for placing the bottom plate 36 on the placement portion 60 and the work for positioning the bottom plate 36 are not obstructed, and the operator can smoothly and quickly. These operations can be performed.

  Next, on the bottom plate 36, the vertical plates 38, the inclined plates 40, and the horizontal plates 42 are positioned. The inclined plate 40 and each horizontal plate 42 are positioned by the inclined plate positioning means and each horizontal plate positioning means, respectively. For each vertical plate 38, the inner support means 54 is interposed between the vertical plates 38, and both end portions in the longitudinal direction of the inner support means 54 are brought into contact with the inner surface of each vertical plate 38. Further, the arm member 64 of the outer support means 56 is turned from the non-operation position to the operation position. Here, since the arm member 64 extends from the upper end side of the support column 62 toward the outer surface of the vertical plate 38 at the operating position, the arm member 64 does not interfere with the side end portion of the bottom plate 36. Therefore, the outer support means 54 can be used when the bottom plate 36 forms the center frame 30 that protrudes outward in the width direction from the lower end of the vertical plate 38.

  After the arm member 64 is turned from the non-operation position to the operation position, the arm member 64 is constrained at the operation position by being rotated so that the semicircular constraining piece 78 is positioned below. Then, the tip of the grip lever 80 is gripped by the operator, and the contact member 66 is tilted from the non-operation position to the operation position, so that each contact portion 88a of the contact member 66 contacts the outer surface of the vertical plate 38. The vertical plate 38 is positioned by contact. The boom mounting pin hole 38a of the vertical plate 38 has a relatively narrow tolerance so that the pin can be connected to the boom 10, and is therefore positioned separately by the pin hole positioning means.

  When the contact member 66 is positioned at the operating position, the ball plunger 84 is engaged with the recess 80a of the grip lever 80, whereby the contact member 66 is positioned at the operating position. When the contact member 66 is located at the operating position, as shown in FIG. 7, the pin connection center A between the contact member 66 and the link piece 82, the pin connection center B between the link piece 82 and the grip lever 80, and The pin coupling center C between the grip lever 80 and the arm member 64 is located on the same straight line. For this reason, the contact member 66 receives this force together with the link piece 82, the grip lever 80, and the arm member 64 even if the contact member 66 is pressed from the vertical plate 38 due to thermal strain generated in the welded portion. Tilt from the position to the non-acting position is prevented.

  After the bottom plate 36, each vertical plate 38, the inclined plate 40, and each horizontal plate 42 are positioned, the members are welded to each other. However, in the welding jig 50 according to the present invention, the thermal strain generated in the welded portion. Even if the contact member 66 is pressed from the vertical plate 38 by the operator, the operator can easily grasp the tip of the grip lever 80 and tilt the contact member 66 from the operating position to the non-operating position. Then, it is detached from the outer surface of the vertical plate 38.

  Further, in the welding jig 50 according to the present invention, after the members are welded to form the center frame 30, the semicircular constraining piece 78 is rotated so as to be positioned upward, whereby the arm The restraint at the operation position of the member 64 is released. The arm member 64 is swung from the operating position to the non-operating position, so that it does not hinder the operation of moving the center frame 30 from the welding jig 50, and the operator can perform this operation smoothly and quickly. it can.

  Further, in the welding jig 50 of the present invention, the contact piece 88 of the contact member 66 is detachably attached to the connection piece 86, so that the vertical plate can be used even in a plurality of center frames having different dimensions between the vertical plates. By changing to a contact piece having a contact portion formed with a projecting dimension corresponding to the inter-dimensional size, the support column can be used without being moved on the base.

  In the embodiment, the non-acting position of the abutting member is described as a position extending obliquely outward in the width direction from the lower end toward the upper end, but outward in the width direction from the upper end toward the lower end. The position may be inclined and extended.

2: Excavator (construction machine)
30: Center frame 36: Bottom plate 38: Vertical plate 50: Welding jig 52: Base 54: Inner support means 56: Outer support means 62: Support column 64: Arm member 66: Contact member 78: Restraining piece 80: Grip lever 80a: recess 82: link piece 84: ball plunger 86: connection piece 88: contact piece

Claims (4)

Welding the upper surface of the bottom plate and the lower ends of a pair of vertical plates positioned at an interval in the width direction on the bottom plate to form a welding jig used when forming a frame of a construction machine,
Including a base on which the bottom plate is placed, an inner support means interposed between the pair of vertical plates, and a pair of outer support means that come into contact with the outer surfaces of the pair of vertical plates,
Each of the pair of outer support means includes a support column erected on the base, an arm member whose base end is pivotally connected to the upper end side of the support column, and an extension end of the arm member An abutting member connected in a tiltable manner,
The arm member is pivotable between a working position extending from the support column toward the outer surface of the vertical plate and a non-working position in which the extended end moves away from the outer surface of the vertical plate,
The abutting member is freely tiltable between a working position extending along the outer surface of the vertical plate and a non-working position extending obliquely outward in the width direction from the lower end or the upper end toward the upper end or the lower end. A welding jig characterized by that.   The welding jig according to claim 1, wherein the arm member is releasably restrained at the operating position.   The welding jig according to claim 1 or 2, wherein the arm member and the corresponding contact member are connected via a link mechanism including a gripping lever that allows the corresponding contact member to be manually tilted.   4. The contact member according to claim 1, wherein the contact member includes a connection piece connected to the extended end of the arm member, and a contact piece detachably attached to the connection piece. 5. The welding jig described.