JP2011218434A - Welding apparatus for grating frame member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding apparatus for a grating frame member capable of efficiently welding the both surfaces of frame members of a grating simultaneously in a short period of time, without generating warpage in the grating.SOLUTION: The welding apparatus 1 for the grating frame member includes: a pair of grating sandwich means 2 and 3 capable of sandwiching grating 50 while standing it, where frame members 54 are temporarily fixed to the both sides of the grating 50, respectively; and welding torch moving bodies 6a, 6b, and 7a, 7b each elevatably provided along the means 2 and 3, respectively and each equipped with a pair of welding torches 4 and 5 for welding the grating 50 on the both front and rear surfaces, sandwiched by the grating sandwich means 2 and 3. Since the apparatus 1 welds the frame members of the grating 50 at four points on the both front and rear surfaces simultaneously, the frame members of the grating can be welded efficiently in a short period of time and warpage of the grating can be prevented.

Description

  The present invention relates to a frame material welding apparatus for grating.

  The grating used as a groove cover or the like that spans the drainage channel of the road is respectively provided on both sides of a lattice body 53 composed of a plurality of long vertical members 51 and horizontal members 52 as shown in FIG. 10 or FIG. After the frame member 54 is pressed and temporarily fixed, an intersection (pressure contact) 55 between the cross member 52 and the frame member 54 is welded. In addition, there is a grating made of a plurality of cross members and frame members without vertical members, and the intersection 50 (pressure contact) between such cross members and frame members is automatically welded in sequence to complete the grating 50. For example, a grating frame welding apparatus disclosed in Japanese Patent Publication No. 6-61617 has been proposed.

  However, the above-mentioned grating frame welding apparatus is configured to place the pre-welding grating that has been press-contacted and temporarily fixed in the apparatus in the horizontal direction, and weld the intersections sequentially in the horizontal direction from above. When the welding was completed, it was turned over and the back side was welded. For this reason, when welding is performed from the front side, the grating may be warped by the welding heat, which often hinders welding the back side. In addition, since welding is performed one side at a time, it is inefficient and requires much time.

Japanese Examined Patent Publication No. 6-61617

  SUMMARY OF THE INVENTION An object of the present invention is to provide a grating frame welding apparatus that can perform grating frame welding on both sides efficiently and in a short time, and does not cause warping in the grating.

  What solves the above-described problem is provided with a pair of grating clamping means that can be clamped in a state in which the grating with the frame members temporarily fixed on both sides is erected, and capable of moving up and down along the pair of grating clamping means. A grating frame welding apparatus comprising: a welding torch moving body having a pair of welding torches for respectively welding the grating sandwiched by the grating sandwiching means from the front and back.

  It is preferable that the welding torch moving body includes an elevating part and a vertically moving body provided with the welding torch and positioning means so as to be movable up and down relatively with respect to the elevating part. The grating frame welding apparatus is preferably arranged in a grating conveying mechanism for conveying the grating before and after welding.

According to the first aspect of the present invention, the grating frame material can be welded on both sides efficiently and in a short time, and the grating is not warped.
According to the invention described in claim 2, in addition to the effects of the above-mentioned claims, it is possible to sequentially weld at appropriate positions.
According to the invention described in claim 3, in addition to the effects of the above-mentioned claims, grating frame material welding can be performed more efficiently and in a shorter time.

It is a front view of one Example of the frame material welding apparatus of the grating of this invention. It is a top view of the frame material welding apparatus of the grating shown in FIG. FIG. 2 is an enlarged schematic plan view of the vicinity of a torch moving body of the grating frame welding apparatus shown in FIG. 1. It is explanatory drawing for demonstrating the effect | action of the positioning member in the torch moving body of the frame material welding apparatus of the grating shown in FIG. It is explanatory drawing for demonstrating the opening / closing mechanism of the grating clamping means in the frame material welding apparatus of the grating shown in FIG. It is explanatory drawing for demonstrating the opening / closing mechanism of the grating clamping means in the frame material welding apparatus of the grating shown in FIG. It is a front view for demonstrating an effect | action of the frame material welding apparatus of the grating shown in FIG. It is a right view for demonstrating the grating conveyance mechanism for conveying a grating to the frame material welding apparatus of the grating shown in FIG. It is an enlarged front view for demonstrating the grating conveyance mechanism for conveying a grating to the frame material welding apparatus of the grating shown in FIG. It is a perspective view for demonstrating the structure of one Example of the grating welded with the frame material welding apparatus of the grating of this invention. It is a perspective view of one Example of the grating welded with the frame material welding apparatus of the grating of this invention.

  In the present invention, in the state in which the grating 50 with the frame members 54 temporarily fixed on both sides is erected, four welding points are simultaneously welded from both the front and back sides of the grating 50, thereby making the grating frame welding efficient. A grating frame welding apparatus 1 that can be performed in a short time and without causing warping in the grating is realized.

A grating frame welding apparatus according to the present invention will be described with reference to one embodiment shown in FIGS.
As shown in FIG. 3 or FIG. 7, the grating frame welding apparatus 1 of this embodiment is a pair of gratings that can be clamped from both sides in a state where the grating 50 with the frame members 54 temporarily fixed on both sides is erected. A pair of welding torches 4 for welding the gripping means 2 and 3 and the grating 50 clamped by the grating sandwiching means 2 and 3, respectively, so as to be moved up and down along the pair of grating sandwiching means 2 and 3. 5 have welding torch moving bodies 6a, 6b, 7a, 7b. Hereinafter, each configuration will be described in detail.

  As shown in FIG. 7, the grating clamping means 2 and 3 are for clamping the grating 50 with the frame members 54 temporarily fixed on both sides in an upright state from both sides.

  As shown in FIG. 1 or FIG. 3, the grating clamping means 2 and 3 are each composed of a long clamping bar 8 erected in the vertical direction and struts 9a and 9b for supporting the clamping bar 8 from the front and rear. Has been. Holes are provided in the upper and lower portions of the columns 9a and 9b, respectively, and holes are also provided in the holding bar 8 at positions corresponding to the holes. An upper pin 10 is inserted into the upper hole, and a lower pin 11 having a diameter smaller than the hole diameter is inserted into the lower hole.

  The sandwiching bar 8 is supported by the columns 9a and 9b so that it can swing by the difference in diameter between the lower pin 11 and the lower hole with the upper pin 10 as a fulcrum. Thus, the clamping bar 8 is in close contact and can be securely clamped even in a grating where the frame members 54 on both sides are not parallel. In this embodiment, both the holding bars 8 on both sides are swingably supported by the columns 9a and 9b, but only one holding bar 8 may be swingably supported.

  As shown in FIG. 1 or FIG. 2, the grating clamping means 2 and 3 are arranged on the open / close moving bases 12 and 13, respectively. By moving in the respective directions, the grating holding means 2 and 3 hold the grating 50 prior to welding, and are separated from the grating 50 toward both sides after welding.

  As shown in FIG. 2 or 5, the open / close moving platforms 12 and 13 are configured to move by the same amount by the ball left screw 15a and the ball right screw 15b, specifically, for left and right screws. A chain 18 is mounted on the sprocket 16 and the motor sprocket 17, and the open / close moving platforms 12, 13 are configured to move inward or outward by driving the motor forward and backward, respectively.

  As shown in FIG. 5, the first tension sprocket 19 is pressed against the chain 18 by the tensile force of the spring 20 to maintain the tension of the chain 18. The first tension sprocket 19 is attached to a rotating member 22 together with the second tension sprocket 21, and the rotating member 22 is rotatably held by a rotating pin 23.

  When the open / close moving bases 12 and 13 are moved in the closing direction (inner side) and the grating holding means 2 and 3 hold the grating 50, the open / close moving bases 12 and 13 are stopped, the ball left screw 15a, The right screw 15b is also stopped. However, since the motor still tries to rotate, the rotating member 22 rotates in the direction of the arrow against the tensile force of the spring 20 as shown in FIG. At this time, the sensor 24 is controlled such that the motor is stopped when the tip of the rotating member 22 is detected. By adjusting the strength of the spring 20, it is possible to adjust the force for sandwiching the grating 50 by the grating sandwiching means 2, 3 disposed on the open / close moving platforms 12, 13.

  The welding torch moving bodies 6a, 6b, 7a, 7b are for sequentially moving the welding torches 4, 5 upward during welding. As shown in FIG. 3, the grating clamping means 2 (left side in FIG. 3) Welding torch moving bodies 6a and 6b are respectively provided before and after the grating holding means), and are provided respectively before and after the grating holding means 3 (the grating holding means on the left side in FIG. 3).

  Specifically, the welding torch moving body 6a is provided on the front side (front side, lower left in FIG. 3) of the grating clamping means 2, and at one end (left end in FIG. 3) of the grating 50, A welding torch 4 is provided so that the intersection with the cross member can be welded from the front side (front side). On the other hand, the welding torch moving body 6b is provided on the rear side of the grating sandwiching means 2 (on the back side and in the upper left in FIG. 3), and at one end of the grating 50 (the left end in FIG. 3), the frame member 54 and the cross member. The welding torch 5 is provided so that the intersection with 52 can be welded from the back side (back side). Thereby, the welding torch moving bodies 6a and 6b provided in the grating clamping means 2 are configured to include a pair of welding torches 4 and 5 for respectively welding the grating 50 from the front and back.

  Similarly, the welding torch moving body 7a is provided on the front side (front side, lower right in FIG. 3) of the grating holding means 3, and the frame member 54 is provided at the other end (right end in FIG. 3) of the grating 50. A welding torch 4 is provided so that the intersection of the cross member and the cross member can be welded from the front side (front side). On the other hand, the welding torch moving body 7b is provided on the rear side of the grating pinching means 3 (on the back side and in the upper right in FIG. 3), and at one end of the grating 50 (the right end in FIG. 3), the frame member 54 and the cross member. The welding torch 5 is provided so that the intersection with 52 can be welded from the back side (back side). Thereby, the welding torch moving bodies 7a and 7b provided in the grating sandwiching means 3 are configured to include a pair of welding torches 4 and 5 for respectively welding the grating 50 from the front and back.

  In this way, the welding torch moving bodies 6a, 6b, 7a, 7b are respectively provided before and after the grating clamping means 2 and 3, each having two points on both sides of the front side of the grating 50 and two points on both sides of the back side. Since four points can be welded simultaneously, the grating frame material can be welded on both sides efficiently and in a short time, and the warping of the grating does not occur.

  The welding torch moving bodies 6a, 6b, 7a, 7b are configured to be movable up and down along the grating pinching means by lift portions 25 provided on both sides of the grating pinching means 2 and 3, respectively. As shown in FIG. 1 or FIG. 3, the elevating unit 25 is configured to be capable of elevating along the linear rail 28 by the action of the ball screw 26 and the servo motor 27.

  As shown in FIG. 3, the welding torch moving bodies 6 a, 6 b, 7 a, 7 b are provided so as to be able to move up and down relatively with respect to the elevating part 25, and move up and down with welding torches 4, 5 and positioning means 29. It has a body 30. The welding torch moving bodies 6a, 6b, 7a and 7b are provided with the welding torches 4 and 5 as described above. Specifically, the vertical moving body 30 is provided with the welding torches 4 and 5. The vertical moving body 30 is configured to be movable up and down by a small amount along the linear rail 31 extending in the vertical direction, but is held by the elevating unit 25 at the lowest position in a normal state.

  The vertical moving body 30 is configured to be movable back and forth by an air cylinder (not shown) along a rail 32 extending in the horizontal direction. By this back-and-forth movement, the welding torches 4, 5 and the positioning means 29 can be brought close to the grating 50 to the required position during welding, and after welding, the welding torches 4, 5 and the positioning means 29 are moved away from the grating 50. be able to.

  The positioning means 29 is for accurately positioning the welding torches 4 and 5 at the welding point between the frame member 54 and the cross member 52, and as shown in FIG. A ratchet-type stopper 35 rotatably attached to the lower portion of the support bar 33 via a support pin 34, and an elastic member 36 for pulling and holding the stopper 35 so as to extend in the vertical direction. It is configured. The stopper 35 includes a claw portion 35 a that protrudes inward at the lower portion, and the welding torches 4 and 5 are disposed below the stopper 35.

  When positioning the welding torches 4 and 5 by the positioning means 29 during welding, first, the vertical moving body 30 is moved along the rail 32 extending in the horizontal direction, and the positioning means 29 and the welding torches 4 and 5 are moved. Close to the grating 50. At this time, as shown in FIG. 4 (1), the claw portion 35 a of the stopper 35 is made to approach between the cross member 52 of the grating 50 and the upper cross member 52. Next, when the welding torch moving bodies 6 and 7 are lifted by the action of the elevating part 25 (specifically, the servo motor 27), the claw part 35a of the stopper 35 is attached to the grating 50 as shown in (2) in FIG. In order to come into contact with the cross member 52 and to climb over the cross member 52, the claw portion 35a of the stopper 35 is slightly displaced outward against the tensile force of the elastic member 36. Further, when the welding torch moving bodies 6 and 7 are raised, the positioning means 29 gets over the cross member 52 and stops as shown in (3) in FIG. Thereafter, as shown in (4) in FIG. 4, when the welding torch moving bodies 6 and 7 are lowered, the lower surface of the claw portion 35a of the stopper 35 comes into contact with the upper surface of the cross member 52 of the grating 50. The welding torches 4 and 5 stop at that position. By welding with the welding torches 4 and 5 arranged below the stopper 35 at this position, it is possible to accurately weld to the welding point between the frame member 54 and the cross member 52.

  By repeating such control by the action of the servo motor 27 and sequentially welding from the bottom to the top of the grating 50, it is possible to weld the same cross member 52 from the front and back of the grating 50 simultaneously. In the state of (4) in FIG. 4, the elevating part 25 is further lowered, but the vertical moving body 30 provided with the welding torches 4, 5 is stopped by the positioning means 29, so that the vertical moving body 30 is a linear rail 32. It rises relatively with respect to the raising / lowering part 25 via. A sensor (not shown) provided on the welding torch moving bodies 6 and 7 detects the relative rise of the vertical moving body 30 and the welding torch moving bodies 6 and 7 are stopped and a welding signal is output and welding is performed. It is controlled so that.

Next, the grating conveying mechanism 40 in which the grating frame welding apparatus 1 shown in FIG. 8 or FIG. 9 is arranged will be described.
The grating transport mechanism 40 is for transporting the grating 50 before and after welding. Specifically, as shown in FIG. 8, the grating transport mechanism 40 is attached to a horizontal rail 41 disposed above the grating frame welding apparatus 1 and attached to the horizontal rail 41 so as to be reciprocally movable in the horizontal direction. The loader 42 and 43 are comprised. The loader 42 is for carrying the grating 50 before welding into the grating frame welding apparatus 1, and the loader 43 is for carrying out the grating 50 after welding from the grating frame welding apparatus 1. is there.

  The loaders 42 and 43 have a reciprocating part 44 attached to the horizontal rail 41 and extending downward, and a grating suction part 45 attached to the lower end of the reciprocating part 44. As shown in FIG. 9, the grating attracting unit 45 includes two magnets 46, and is configured so that the grating 50 can be attracted by these magnets 46. Further, the grating suction portion 45 is configured to be capable of rotating 90 ° about a support shaft 48 that is also a connection portion with the reciprocating portion 44 by expansion and contraction of the rod of the cylinder 47. Thereby, as shown in FIG. 8, the grating 50 extended in a horizontal direction can be erected.

Further, a method of welding the grating 50 using the grating frame welding apparatus 1 disposed in the grating conveying mechanism 60 will be described in order.
First, as shown in FIG. 8, the loader 43 is moved toward the grating frame welding apparatus 1 in a state where one of the stacked gratings 50 is adsorbed by the magnet 46 of the grating adsorption unit 45. During this time, the rod of the cylinder 47 is extended, and the grating 50 is rotated 90 ° to be in an upright state. When the grating 50 arrives at the grating frame welding apparatus 1, the clamping means 2 and 3 are moved inward from both sides, and the grating 50 is clamped as shown in FIG. Thereafter, the loader 43 is moved backward to wait at the initial position. When the grating 50 is clamped by the clamping means 2, 3, the welding torch moving bodies 6 a, 6 b, 7 a, 7 b provided before and after the clamping means 2, 3 are moved to the bottom of the clamping means 2, 3 by the action of the servo motor 27. Lower.

  Next, as shown in FIG. 3, the vertically moving body 30 is brought close to the grating 50 along the rail 32. At this time, the claw portions 35a of the stopper 35 are brought close to each other so as to enter between the cross member 52 of the grating 50 and the upper cross member 52 as shown in (1) in FIG. When the welding torch moving bodies 6 and 7 are raised by the action of the servo motor 27, the claw portion 35a of the stopper 35 abuts against the cross member 52 of the grating 50 as shown in (2) in FIG. It slightly shifts outward against the tensile force of 36. Further, when the welding torch moving bodies 6 and 7 are raised, the positioning means 29 gets over the cross member 52 and stops as shown in (3) in FIG. Thereafter, as shown in (4) in FIG. 4, when the welding torch moving bodies 6 and 7 are lowered, the lower surface of the claw portion 35a of the stopper 35 comes into contact with the upper surface of the cross member 52 of the grating 50. The welding torches 4 and 5 stop at that position. By welding with the welding torches 4 and 5 arranged below the stopper 35 at this position, it is possible to accurately weld to the welding point between the frame member 54 and the cross member 52. By repeating such control by the action of the servo motor 27 and sequentially welding from the lowermost part to the uppermost part of the grating 50, the same cross member 52 is welded simultaneously from the front and back of the grating 50.

  When the welding of one sheet is completed, the up-and-down moving body 30 moves along the rail 32 in a direction away from the grating 50, and accordingly, the positioning means 29 and the welding torches 4 and 5 are also separated from the grating 50. When the vertically moving body 30 moves away from the grating 50, the unloading loader 42 adsorbs the grating 50 by the grating adsorption unit 45. Thereafter, the clamping means 2 and 3 are moved outward, respectively, and the clamping of the grating 50 is released. When the holding of the grating 50 by the holding means 2 and 3 is released, the next grating 50 is carried into the grating frame welding apparatus 1 by the loader 43, and the loader 42 is moved away from the grating frame welding apparatus 1. Moving. During this movement, the rod of the cylinder 47 is contracted, and the grating 50 is rotated by 90 ° to be in a horizontal state. Further, after the movement, the grating 50 is piled up after welding.

  In this way, by providing the grating frame welding apparatus 1 in the grating conveying mechanism 40, the grating 50 is carried in and out of the grating frame welding apparatus 1 and is fully automated, and the above operations are repeated. Thus, the grating 50 can be welded more efficiently and in a short time.

DESCRIPTION OF SYMBOLS 1 Grating frame material welding apparatus 2, 3 Grating clamping means 4, 5 Welding torch 6a, 6b, 7a, 7b Welding torch moving body 8 Clamping bar 9 Strut 10 Upper pin 11 Lower pin 12, 13 Opening / closing moving base 14 For opening / closing rail
15a Ball left screw 15b Ball right screw
16 Sprocket for left and right screw 17 Motor sprocket 18 Chain 19 First tension sprocket 20 Spring 21 Second tension sprocket 22 Rotating member 23 Rotating pin 24 Sensor 25 Lifting part 26 Ball screw 27 Servo motor 28 Linear rail 29 Positioning means 30 Vertical movement Body 31 Linear rail 32 Rail 33 Support bar 34 Support pin 35 Stopper 35a Claw part 36 Elastic member 40 Grating transport mechanism 41 Horizontal rails 42 and 43 Loader 44 Reciprocating part 45 Grating adsorption part 46 Magnet 47 Cylinder 48 Support shaft 50 Grating 51 Vertical Material 52 Cross member 53 Grid 54 Frame material

Claims (3)

  A pair of grating sandwiching means that can be sandwiched in a state where the grating with the frame members temporarily fixed on both sides is erected, and a pair of grating sandwiching means that can be moved up and down and sandwiched by the grating sandwiching means A frame welding apparatus for a grating, comprising: a welding torch moving body including a pair of welding torches for welding the grating from the front and the back.   2. The grating according to claim 1, wherein the welding torch moving body includes an elevating part and a vertical moving body provided so as to be movable up and down relatively with respect to the elevating part and provided with the welding torch and positioning means. Frame material welding equipment.   3. The grating frame welding apparatus according to claim 1, wherein the grating frame welding apparatus is arranged in a grating conveying mechanism for conveying the grating before and after welding. 4.

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