JPS5994589A - Welding machine - Google Patents

Abstract

PURPOSE:To determine exactly the distance between a welding tip and a base material at a prescribed value with a simple construction by supporting horizontally movably a stopper and a contact member in such a way that the respective contact surfaces can be press-contacted selectively. CONSTITUTION:A cylinder 48 is operated when a torch 56 is brought to a required welding position by the movement of a traveling carriage 34, by which a stopper 64 is pressed to a contact member 72, and the torch 56 is thereby lowered down to a prescribed height, then welding with the torch 56 is performed. The torch 56 is moved upward by the cylinder 48 upon ending of welding. When a housing having a different specification size is going to be welded, the member 72 is turned to bring any of adequate contact surfaces (a), (b), (c), (d) oppositely to a stopper 64 and the welding is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding machine, and particularly to an improvement in a welding machine that changes the height of a welding torch depending on the type of workpiece.

Conventionally, as shown in FIGS. 1 and 2, for example, in butt welding of axle housings 2 and 4, in order to obtain satisfactory welding quality, appropriate welding conditions (welding current,
It is necessary to maintain the distance between the welding tip 6.8 and the housings 2, 4 at appropriate values. Especially in a multi-electrode welding device used for butt joints as shown in the figure.

It is necessary to measure and adjust the distance between the welding tip of each electrode and the base metal for each plate thickness.

Therefore, conventionally, cover 10. Without the ring plate 12 and flange 14, as shown in FIGS. 3 and 4, the axle housings 2, 4 or 2a, 4a are fixed on the base 17 with the stopper 16, and supported on a traveling truck (not shown). Welding torch 18 with a welding tip
In the case of a system in which the vehicle is moved together with the same traveling trolley,
Since this was done by manually finely adjusting the welding ch 18 in the vertical direction depending on the workpiece, there were problems such as height accuracy varying depending on the operator.

Further, as a conventional example of automated adjustment of the torch height direction, a welding machine shown in FIG. 5 is known. The welding machine includes a feed screw 22 driven by a motor 20, a torch support member 24 that is moved up and down by the feed screw 22,
The limit switch 26 comes into contact with the torch support member 24 to stop the motor 20 when the torch support member 24 is lowered to a set height, but the stop position is electrically locked. Just be.

Furthermore, if the torch support member 24 is repeatedly raised or lowered rapidly, there is a problem that the inertia of the motor 20 deteriorates the accuracy of the stopping position. In order to solve this problem, a pulse oscillator may be attached to the feed screw 22 and the motor 20 may be pulse-controlled, but in this case, the electrical control is complicated and expensive.

The present invention has been devised in view of the above, and includes an elevating member that is supported movably in the vertical direction on nine units and has a welding torch attached thereto, a stopper supported on one of the above-mentioned platform and the elevating member, and a and an abutment member supported by the other of the elevating members and having a plurality of abutment surfaces of different heights that can face the stopper, and one of the stopper and the abutment member is opposite to the stopper. The stopper is supported by the table or the elevating member so as to be movable in the horizontal direction so that the contact surfaces of the contact member can selectively contact each contact surface of the contact member, and the stopper is brought into contact with any of the contact surfaces of the contact member. The gist of the present invention is a welding machine characterized in that the height of the elevating member relative to the table is determined by bringing the elevating member into contact with the stand.

Two embodiments of the present invention will be described in detail below with reference to FIGS. 6 to 16.

Traveling trolley 3 guided by guide rails 32 on base 30
A female screw member 36 is fixed to 4.

On the other hand, a bearing 40 that rotatably supports the feed screw 38 screwed into the female thread member 66 is fixed to the base 60, and a motor 42 that rotates the feed screw 38 is supported. A main plate 46 is erected on the traveling truck 34 by a bracket 44.

F cylinder 48. ．． 50 are fixed respectively.

Rods 52' and 54 fixed to each piston in both air cylinders 48.50 have m-extraction toes; 56.5
Elevating and lowering members 60 and 62, each having a number 8 attached thereto, are fixed. Stoppers 64, 66 attached to the elevating members 60, 62 are directed downward. Contact members 72, 7. are rotatably supported on vertical axes by holders 68 and 70 fixed to the main plate 46, respectively. ! I has four contact surfaces a, b, which are directed upward and have different heights from each other.
It has c and d. Further, the abutment members 72 and 74 are capable of sliding a predetermined amount vertically relative to the holders 68 and 70, respectively, and are biased upward by a spring 76. Then, due to the contraction of the air cylinder 48.50, the stopper 64.66 is moved to the contact surface a of the contact member 72.74.
, b, c, and d, and the abutting member 72.74 abuts against the holder 68.70 against the spring 76, thereby raising and lowering the elevating member 60.74 having the welding torch 56.58. The vertical position of 62 is determined. Main plate 46
The mitt switches 82, 84 supported by brackets 78, 80, respectively, when the stopper 64° 66 is lowered and the abutting member 72, 74 abuts against the holder 68, 70 against the spring 76. Then, its working end is displaced and closed by the docks 86, 88 at the lower ends of the abutment members 72, 74.

This limit switch 82.84 causes the stopper 64.
66 and the contact members 72 and 74 are in contact with each other. Limit switches 94 supported by brackets 92 attached to each cylinder 48°50
．． 96, when the elevating members 60 and 62 rise almost to their upper ends, their working ends are displaced and closed by the docks 98 and 100 fixed to the elevating members 60 and 62, respectively. Completion of lifting of the lifting member 60, 62 can be known by the limit switch 94, 96.

Next, the rotation mechanism of the contact members 72 and 74 is shown in FIGS.
This will be explained according to Figure 5.

Upper cams 106, 108. Ratchet wheels 110, 11.2 and lower cams 114, 116 are non-rotatably and slidably fitted.

Ratchet wheels 110, 112 are holders 68°70
The pawls 122 and 124 supported by and biased by springs 118 and 120 allow rotation only in the counterclockwise direction in the figure. Guide 126 to holder 68°70
, 128, respectively, and are slidably supported by the rods 130, 13.2, respectively, and are connected to each other by a connecting fitting 134. Each rod 130 and 132 has a spring 1.
Ratchet wheel 110 by 36,138. t1
Feed jaw i40. biased towards 2. i42, and these feeders 140. '142 is 2 rods 1
30, 1' 32 is displaced from the state shown in FIG. 15 to the left in the drawing, the ratchet wheel 110° 112 is rotated by one tooth in the counterclockwise direction in the drawing, and when returning to the original state, the pawl 122, 124, which passes over the teeth of ratchet wheels 110, 112 stopped by 124. Therefore, when the rods 130, 132 are reciprocated once by the air cylinder 144 attached to the holder 68, the nine ratchet wheels 110, 112 are synchronously rotated counterclockwise by one tooth. Note that 145 is a limit switch supported by a bracket 143 on the main plate 46, which is closed when the connecting fitting 164 is in the position shown in FIG. 15, and is used to know that the cylinder 144 has operated for a predetermined stroke. be.

In each of the cams 106, 108, 114, and 116, as is clear in FIG. 14, the protrusion of the cam 114 is offset 90 degrees clockwise in the figure with respect to the protrusion of the cam 106.

The protrusion of the cam 108 is offset 90 degrees clockwise in the figure with respect to the protrusion of the cam 114, and the protrusion of the cam 11 is offset with respect to the protrusion of the cam 108.
The protrusion 6 is set to be deviated by 90 degrees in the cutting direction in the drawing. The retainers 68 and 70 each have one end attached to each cam i o.
6. , i os, i 14°116 K 'I Pin 146 urged by a spring to contact,
148, 150, and 152 are slidably supported.

Also, the brackets 154, 156, 1 are attached to the holders 68, 70.
58. Limit switch 16 supported via M+O
2,164°166.168 has its working end at each cam 106°108.114. pin 1 by protrusion i16
46゜148, 150, 152 is pressed by each pin and closed, and either limit switch 16
2,164. When 166.168 is closed,
Which of the contact surfaces al b of the contact members 72 and 74
, c, d are located at positions facing the stoppers 64, 66.

Next, the operation of the present welding machine will be described in the case where it is applied to butt welding of the 7xle housing 2.4 shown in FIG.

First, the required welded portions of the axle housings 2 and 4 are placed below the torch 56.58 in the running direction of the truck 34, and the stopper 64.66 is attached to the contact members 72, 717) contact surface JL,
It is determined by bringing it into contact with any appropriate one of b, c, and d. Note that the selection of each contact surface is made using the contact member 7.
This is done by 2.74 rotations.

Next, the traveling truck 34 is moved by the motor 42, welding is performed from the left end of the axle housings 2 and 4 using torches 56 and 58, and before the torch 58 contacts the cover 10, the cylinder 50 is activated to raise the torch 58. , same torch 5
To prevent interference between 8 and cover 10. Furthermore, the traveling carriage 34 is moved and the torch 56 is used, and before the torch 56 comes into contact with the cover 10, the cylinder 48 is operated to raise the torch 56 to prevent interference between the torch 56 and the cover 10. Furthermore, when the torch 58 reaches the required welding location on the right side of the cover 10 due to the movement of the traveling carriage 34-, the cylinder 5
By activating the stopper 66 and bringing the stopper 66 into contact with the abutting member 74, the torch 58 is lowered to a predetermined height and welding by the torch 58 is performed again. Subsequently, when the torch 56 reaches the required welding location on the right side of the cutter 10 due to the movement of the traveling trolley 4, the cylinder 48 is actuated to bring the stopper 64 into contact with the abutment member f2.
The torch 56 is lowered to a predetermined height and welding by the torch 56 starts again. Finally, both torches 56.58, which have completed the welding, are each lifted up by means of cylinders 48.50.

And axle with different specification dimensions...Using 2゜4
When welding, rotate the abutment member 72.74 and press any of the appropriate abutment surfaces a, b, c, d to the stopper 64.66.
The process is carried out in the same order as above. Note that the heights of the contact surfaces a, b, c, and d are appropriately set in advance according to the axle housing.

Next, the effects of this welding machine will be explained.

In this welding machine, as described above, the welding torches 56,'
58 is mechanically determined by the contact between the stopper 64, 66 and one of the abutment surfaces a, b, c, d of the selected abutment members 72', 74.

The distance between the welding tip and the base metal can be set accurately to a predetermined value, and the structure is simple, so it can be implemented at a much lower cost than, for example, a type that uses pulse control of the drive motor. .

In addition, in the nine welding machine, the electric motor 42. cylinder 48
,50. Automation can be achieved by electrically controlling the operation of the cylinder 144.

An example thereof will be explained with reference to FIG.

In the same figure, reference numeral 180 is an air supply source that supplies F to the cylinders 48.5'0 and 144, 182 is a cylinder 1440 control pulp, and 186 is a control valve 182 that controls the control valve 182 in accordance with a signal from a selection switch 188.
44 and select the desired limit switches 162, 16.
4. This is a push circuit that stops the operating side of the cylinder 144 when any one of 166.1<58 is closed. Note that a limit switch 145 is connected to the control circuit 18B, and is used to switch the forward movement and backward movement of the cylinder 144 by the control valve 182.

190 and 192 are control knobs for the cylinders 48 and 50, respectively; 194 is a position sensor that detects the position of the traveling truck 34 with respect to the base 60; and 196 is the base 3 of the truck 34.
A memory circuit that stores the cylinder 48.50 operating direction corresponding to the position relative to 0.

A control circuit 198 controls the control valves 190, 192 based on information from the position sensor 194, the memory circuit 196, and the limit switches 78, 80, 94, 96 for sensing the states of the cylinders 4S, 50. Further, the control circuit 198 is configured to control an activation switch 200 of the motor 42 that drives the traveling trolley 34 as necessary. Note that 202 is a start switch that starts the four-way control port 198 together with the motor 42.

With this configuration, first, the 2 selection switch 188 selects the contact surface a of the contact member 72, 74 according to the type of the axle housing 2.4.

This welding machine can be automated by selecting b, c, and d and then operating the start switch 202.

Furthermore, if a microcomputer or the like is used as necessary, a more complicated operation sequence can be performed, and full automation can be achieved.

In the above embodiment, both of the abutting members 72 and 74 are configured to rotate around a vertical line, but they may also be configured to be slidable in the horizontal direction if necessary.

Further, although the above embodiments apply the present invention to a two-electrode type welding machine, this embodiment is a one-electrode type welding machine.

Of course, it can also be applied to things other than filter electrodes.

[Brief explanation of drawings]

Fig. 1 is a front view showing a method of butt welding a 7xle housing, Fig. 2 is a plan view of Fig. 1, Figs. 6 is a front view showing an embodiment of the present invention, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG. A sectional view along the line ■-■, FIG. 9 is a left side view of FIG. 6, FIG. io' is a top view of FIG. 6, and FIG. To? ' = 5 arrow sectional view, Fig. 12 is a rear view of the main part of Fig. 6, Fig. 16 is an arrow sectional view taken along line X - ■ in Fig. 12, Fig. 14 is XIV in Fig. 12. -XI
A sectional view taken along line V, Fig. 15 is xv-x in Fig. 12.
FIG. 16, which is a sectional view taken along the line v, is an explanatory diagram showing an example of a control device of the welding machine of this embodiment. 30... Base, 34... Traveling trolley. 46...Main plate, 48.50...Cylinder. 56.58...Torch, 60.62...Elevating member. 64.66... Stopper, 72.74... Contact member. Mathematics Figure 1 Figure 2 Calculation Figure 5 ``~ Chapter 4 Figure 5

Claims (1)

[Claims] An elevating member supported on a table so as to be displaceable in the vertical direction and to which a welding torch is attached, a stopper supported on one of the table and the elevating member, and a stopper supported on the other side of the table and the elevating member and facing the stopper. and a contact member having a plurality of contact surfaces having different heights, and one of the stopper and the contact member is configured such that the stopper and each contact surface of the contact member are selectively connected to each other. The height of the lifting member with respect to the table is adjusted by being supported by the table or the lifting member so as to be able to move in the horizontal direction so that the lifting member can come into contact with the stand, and by bringing the stopper into contact with any one of the contact surfaces of the contacting member. A welding machine configured to determine