JPS6025337Y2 - Flash butt welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flash butt welding apparatus that is provided with a conveying means for mutually conveying a workpiece between a receiving position of the workpiece and a predetermined position on an electrode.

Recently, flash butt welding machines have been used to manufacture rims for automobile tires, etc. After butt welding both ends of a circularly formed steel plate to form a flat rim, the rims are then passed through a pressure roller to form the rim into the desired shape. Pressure molded.

By the way, in the conventional flash butt welding machine of this type, loading the workpiece into a predetermined position on the electrode and taking out the welding workpiece after welding were carried out manually. In particular, the weight of rims mounted on large trucks, buses, etc. reaches tens of tens of nines, and the work of continuously manually loading and unloading such objects to be welded is extremely hard work. Moreover, the workers were forced to work extremely hard, as they had to take out the heated rim by hand immediately after welding was completed.

The present invention was developed in view of the above circumstances, and it provides a means of transporting the workpiece between the receiving position of the workpiece and a predetermined position on the electrode. It is an object of the present invention to provide a flash butt welding device that automates the loading and unloading work of objects to be welded, reduces the burden on workers due to heavy labor, and improves productivity.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

A fixed base 2 is fixed to one side of the bed 1 via an insulator 2a, and a fixed electrode 3 is fixed to one end of the upper surface of the fixed base 2 via an electrode boulder 4.

Further, a clamp arm 6 having a protrusion 6a integrally provided at its front end is rotatably supported on the fixed base 2 via a shaft 7, and is attached to the protrusion 6a via a holder member 6b. One abutting end 9a of an annular workpiece 9 such as a flat rim is clamped by the pressure member 8 and the fixed electrode 3, as shown in FIG.

The clamp arm 6 is rotated within a certain angle by a hydraulic cylinder (not shown) provided at the rear end of the clamp arm 6.

On the other hand, a support member has a movable table 11 mounted on the other side of the bed 1 so as to be slidable in the direction of the fixed table 2, and a pressure control cylinder 12 for driving the movable table 11 erected on the bed 1. 13, the pressurization control cylinder 12
The tip of the operating rod 12a is attached to a shaft support 14 projecting above the movable table 11, so that the movable table 11 can be driven forward and backward in the direction of the fixed table 2 by means of a pressure control cylinder 12.

A moving side electrode 15 is provided at one end of the upper surface of the moving table 11.
is fixed via an electrode holder 16.

Further, a clamp arm 18 having a protrusion 18a integrally provided at its front end is rotatably supported on the movable table 11 via a shaft 70, and a holder member 18 is attached to the protrusion 18a.
The pressure member 19 and the moving side electrode 15 attached via b
Then, the other abutting end 9b of the workpiece 9 is clamped.

Note that the clamp arm 18 is similar to this clamp arm 1.
It is rotated within a certain angle by a hydraulic cylinder 10 provided on the rear end side of 8.

Further, the electrode holders 4 and 16 are each connected to both terminals (not shown) of a welding transformer 20 disposed at the bottom of the bed 1 via secondary conductors (not shown), and the welding current is transferred to the fixed side electrode 3. And he is trying to supply electric power to the moving side electrode 15.

25 is installed on the front side of the welding device main body, and a rail 25a
This supply side chute 25 has a
In this case, the workpiece 9 supplied to the left side of the rail 25a in FIG. 1 or FIG. It has a length that can be supplied to the discharge side kicking mechanism 30 disposed at P.

In other words, a pair of kicking rollers 27, 27 on which the workpiece 9 is placed, and a pair of kicking rollers 27.
A supply-side kicking mechanism 26 having a cylinder 28 connected via a connecting link 80 or the like is provided at the lower part of the roller 27, and as shown by the solid line in FIG. The roller on the left side of the figure) is maintained at a position immediately below the rail 25a, but when the supply side kicking mechanism 26 is activated, it can be rotated in the direction of arrow A by the cylinder 28 as shown by the chain line. It has become.

Note that, like the supply side kicking mechanism 26, the discharge side kicking mechanism 30 also includes a pair of kicking rollers 29, 29 and a connecting link 85 at the lower part of the kicking rollers 29, 29.
As shown by the solid line in FIG.
The cylinder 3 is kept at a position on the same horizontal plane, which is slightly lower than the horizontal plane of cylinder 5a, but when kicking off, the cylinder 3
1, it can be rotated in the direction of arrow B as shown by the chain line.

A discharge side chute 67 is installed in front of the welding apparatus main body like the supply side chute 25, and receives the workpiece 9 kicked out by the discharge side kicking mechanism 30 from the receiving position P to the discharge side chute. 67 and take it out on the right side.

Next, the conveying means 21 for the workpiece 9 to be welded, which is a main part of the flash butt welding apparatus according to the present invention, will be explained.

The conveyance means 21 includes a support mechanism 22, a first drive mechanism 23,
The second drive mechanism 24 has a function of mutually transporting the workpiece 9 between a predetermined receiving position P that receives the workpiece 9 and the predetermined positions of the electrodes 3 and 15.

The support mechanism 22 includes a pair of parallel support rods 32, 32 maintained in a substantially horizontal state, and these support rods 32, 32 are integrally fixed to the lower end portion, and are arched symmetrically on both sides. It consists of curved guide arms 33, 33 and a support base 34 to which the guide arms 33, 33 are integrally attached.

At the receiving position P, the support rods 32, 32 are interposed between the kicking rollers 29 and 29 of the discharge side kicking mechanism 30, and as shown in FIG.
It is positioned so that it occupies a position directly below the.

Further, the support stand 34 has a bracket 35 having a U-shaped longitudinal section and a front plate 36 attached to the front surface of the bracket 35. As shown in FIG.
Attach the upper end of the guide arm 33 to the bolt 37.
37 and attach the front plate 36 to the bracket 35.
It is fixed with bolts 38, 38.

Note that the portions of the front plate 36 into which the bolts 38 and 38 are fitted are elongated holes 39 and 39 that are elongated in the vertical direction as shown in FIG.
A pair of key grooves 40 are recessed in opposing parts of the front plate 36 and the bracket 35, and a key material 41 is inserted into the key groove 40 to connect the front plate 36 to the bracket 35. This allows for slight adjustments in the vertical direction without tilting to the left or right.

That is, a bracket 43 having a U-shaped notch 43a as shown in FIG. 7 is integrally fixed to the bracket 35 with a pin 44, 44 as shown in FIG. A protruding piece 45 is formed by cutting out the lower part of the central part of the bracket 43 and bending it forward into an L shape to form a protruding piece 45 into which a screw hole 46 is screwed. The tip of the adjustment bolt 47 is screwed into the screw hole 46 of the protruding piece 45.

Therefore, the bolt 38. which fits into the elongated hole 39.39.
38 and turn the flanged adjustment bolt 47, the front plate 36 can be moved vertically by a small amount with respect to the bracket 35, and the workpiece to be welded placed on the receiving position P or on the electrodes 3, 15 can be moved. The distance in the vertical direction between the workpiece 9 and the support rods 32, 32 can be adjusted within a certain minute range, and the distance can be adjusted as appropriate depending on the size of the workpiece 9 to be welded.

Incidentally, the upper and lower bearing houses 51a have a pair of left and right shafts 52,52 inserted through the upper and lower surfaces of the bracket 35, and the shafts 52,52 are fixed to the back plate 56.

Left and right bearing support mechanism 51.5 consisting of 51b
1, it is supported so as to be slidable in the vertical direction.

In other words, the upper and lower bearing houses 51a.

51b each include a stroke ball bearing 55,
... is accommodated, and the stroke ball bearing 55.
The shafts 52 and 52 are slidably inserted into each of the shafts 52 and 52.

Further, the back plate 56 is driven forward and backward in the front and back direction by a first drive mechanism 59 consisting of an air cylinder 59a and the like disposed on a stage 82 constructed of frames 81, etc. Knuckle 5 of cylinder 59a
9b is attached to the back plate 56 via a holding fitting 58.

Further, a pair of guide sleeves 62.62 are disposed on both sides of the air cylinder 59a in parallel with the air cylinder 59a, and bolts 68.68 are inserted into these guide sleeves 62.62 with one end attached to the back plate 56. A pair of guide rods 63 and 63 attached through the guide rods are slidably inserted.

Note that the air cylinder 5 comes into contact with a protruding piece 64 fixed to the other end of one guide rod 63 via a bolt 69.
Limit switches i, s, and LS2 are provided to detect the forward stop position and backward stop position of 9a.

Further, the upper surfaces of the upper bearing houses 51a, 51a are bridged via a support plate 71, and an air cylinder 65a constituting a second drive source 65 is disposed at the center of the upper surface of the support plate 71.

Then, the knuckle 65b of the air cylinder 65a is attached to the upper surface of the bracket 35 via the holding fitting 72, and the bracket 35, that is, the support rod 32, 32 on which the workpiece 9 is placed, is It is driven up and down in the vertical direction by the cylinder 65a.

Reference numeral 48 denotes a stopper bolt screwed onto the lower surface of the bracket 35, and the tip end of this stopper bolt is attached to the contact plate 57 which is fixed to the back plate 56 via a bolt 73 when the bracket 35 moves upward.
The bracket 3 is brought into contact with the bottom surface 57a of the bracket 3.
5, that is, the top dead center position of the support rods 32 and 32, can be adjusted by rotating the stopper bolt 48.

Note that 57b is a reinforcing rib provided on the abutment plate 57.

The present invention has the above configuration and operates as follows.

First, when welding, the object to be welded 9 is
5, the supply side kicking mechanism 26 rotates in the direction of arrow A.

That is, the object to be welded 9 is kicked out by the supply side kicking mechanism 26 and gradually rolls to the right along the rail 25a, and eventually reaches the kicking roller of the discharge side kicking mechanism 30 from the right end of the rail 25a. It is supported on 29,29.

In this state, the object to be welded 9 is placed directly above the support rods 32, 32 of the support mechanism 22,
That is, it is maintained at the receiving position P.

Next, from this state, the operation of the conveying means 21 according to the present invention is started.

Further, when the second drive mechanism 23 is activated and the support rods 32.degree. As if being scooped up by the rods 32, 32, it is transferred onto the support rods 32, 32 and lifted as it is to a predetermined position above the receiving position P.

When the workpiece 9 reaches a predetermined position above the receiving position P, the first drive mechanism 23 is actuated, whereby the workpiece 9 is moved from above the receiving position P to the support rods 32 and 32. It is moved backward to a predetermined position above the electrodes 3 and 15 while being supported by the electrodes 3 and 15.

That is, the state in which the protruding piece 64 attached to the guide rod 63 is in contact with the limit switch LSI as shown in FIG. state), and at this retracted position, the pressure feeding of compressed air to the air cylinder 59a is stopped.

Next, when the workpiece 9 reaches a predetermined position above the electrodes 3 and 15, the second drive mechanism 24 is again energized by the limit switch LS2, and this second drive mechanism 24 is activated again, and the support mechanism 22 is lowered, and the object to be welded 9 is placed at a predetermined position on the electrodes 3 and 15 accordingly.

In this way, a series of transport operations from the receiving position P of the workpiece 9 before the start of the welding operation to a predetermined position on the electrodes 3, 15 are completed.

When the welding object 9 has been loaded onto the electrodes 3 and 15, as described above, both abutting ends 9a+9b of the welding object 9 are connected to the fixed side electrode 3 and the pressure member 8, and the movable side electrode 15 and the pressure member 19.
The movable base 11 is moved forward in the fixed base 2 direction by the pressurizing cylinder 12 to bring the butt ends 9a and 9b of the workpiece 9 into contact with each other, and the fixed side electrode 3 and the movable side electrode Welding work is performed by supplying a welding current to 15.

After the welding work is completed, a transport work that is the reverse of the transport work described above, that is, a take-out work in which the workpiece 9 placed on the electrodes 3, 15 is returned to the receiving position P is performed.

At the start of the transport work to take out the workpiece 9, the support rod 32 of the support mechanism 22 is maintained at a position immediately below the workpiece 9, facing the workpiece 9. From this state, the second drive mechanism 24
is activated, the support rod 32 hits the workpiece 9 from below, supports the workpiece 9, and raises the workpiece 9 to a predetermined position above the electrodes 3 and 15.

When reaching a predetermined position above the electrodes 3, 15,
The first drive mechanism 23 acts to transport the workpiece 9 from a predetermined position above the electrodes 3 and 15 to a predetermined position above the receiving position P.

The protruding piece 64 is connected to the limit switch Ls as shown in FIG.
2 (the state shown by the solid line 64) to the state where the limit switch LS1 is in contact (the state shown by the chain line 64').

Eventually, when the workpiece 9 reaches a predetermined position above the receiving position, this is detected by the limit switches I and S1, and this detection signal is sent to the second drive mechanism 24.

The second drive mechanism 24 is actuated by the limit switch LS, and moves the workpiece 9 supported by the support mechanism 22 downward from a predetermined position above the receiving position P to the receiving position P; At the receiving position P, the sheet is placed on the kicking rollers 29, 29 of the discharge side kicking mechanism 30, and a series of unloading operations is completed.

The object to be welded 9 supported on these kicking rollers 29° 29 is kicked out toward the discharge side chute 67 by the rotation of the discharge side kicking mechanism 30 in the direction of arrow B.
Thereafter, it rolls onto the discharge side chute 67 and is taken out at the other end of the discharge side chute 67, and the same operation is repeated successively thereafter.

In this way, from the receiving position P of the workpiece 9 to the electrode 3.15
Since the work of loading the welded workpiece 9 into the predetermined position above and taking out the welded workpiece 9 from the electrodes 3 and 15 can be carried out automatically and reliably, the heavy labor associated with loading and unloading work of the workpiece can be avoided. This can significantly improve work efficiency.

In addition, when the flash butt welding apparatus is equipped with the supply side chute 25 and the discharge side chute 67 as in this embodiment, each transport operation of the workpiece 9 from the supply position to the receiving position P and from the receiving position P to the take-out position is performed. Since there is no need for human intervention, almost all processes of welding work can be completely automated.

As described above, the present invention provides a flash butt welding apparatus that is provided with a conveying means for mutually conveying a workpiece between a receiving position of the workpiece and a predetermined position on an electrode, in which the workpiece is a support mechanism that supports the
a first drive mechanism that drives the support mechanism and causes the workpiece to be welded supported by the support mechanism to reciprocate in the front-rear direction between above the receiving position and above a predetermined position of the electrode; a second mechanism for moving the supported workpiece downward to be placed on the electrode and at the receiving position, and moving the workpiece placed on the electrode or at the receiving position upward so as to be supported by the support mechanism; Since the flash butt welding device is equipped with a drive mechanism, it is possible to weld objects 9 that weigh up to several tens of kilograms.
In addition to reducing the heavy labor involved in transporting the workpiece, the work to transport the workpiece can be carried out easily and automatically, and the rim, which has been heated to a high temperature, can be directly picked up and taken out immediately after welding is completed. There is no need to do this, and it has great effects that contribute to improving productivity and ensuring safe work.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is an overall front view, Fig. 2 is a right side view of Fig. 1, Fig. 3 is a top view of Fig. 1, and Fig. 4 is a supply side view. Enlarged front view of shooter part, 5th
6 is a front view of FIG. 5, FIG. 7 is an enlarged perspective view of the bracket 43, and FIG. 8 is a cross-sectional view taken from the direction of arrow XX in FIG. 5. The plan view, FIG. 9, is a top view of FIG. 3.15... electrode, 9... object to be welded,
21... Conveyance means, 22... Support mechanism, 23... First drive mechanism, 24... Second drive mechanism, 9...・Acceptance position.

Claims (1)

[Scope of utility model registration request] A flash butt welding apparatus that is provided with a transport means for mutually transporting a workpiece between a receiving position of the workpiece and a predetermined position on the electrode, a support mechanism that supports the workpiece as the transport means; a first drive mechanism that drives the support mechanism and causes the workpiece to be welded supported by the support mechanism to reciprocate in the front-rear direction between above the receiving position and above a predetermined position of the electrode; a second mechanism for moving the supported workpiece downward to be placed on the electrode and at the receiving position, and moving the workpiece placed on the electrode or at the receiving position upward so as to be supported by the support mechanism; A flash butt welding device characterized by comprising a drive mechanism.