JPS58112696A - Automatic vertical down welding device - Google Patents

Abstract

PURPOSE:To control the descending speed of a carriage automatically constant with a simple device by providing a permanent magnet field DC motor and a centrifugal switching mechanism to the carriage and connecting and disconnecting the contacts of the switching mechanism to and from the motor brushes according to the speeds of the carriage. CONSTITUTION:An operator pulls the switch of a welding torch to generate arc and pulls a detaining pin 12 to disengage the pin from a rack 11 and to allow a carriage 3 to descend by gravity along rails 5. Then, the gear 20 meshed with the rack 11 rotates to rotate a motor shaft 18 and a shaft 23. As the shaft 18 revolves, a permanent magnet field DC motor 17 operates as a power generator and generates electric power. On the other hand, according to the number of revolutions of the shaft 23, a weight 25 and a stationary contact 27 repeat contact and non-contact to apply the braking force upon the descending of the carriage 3 and to release the braking force according to the electric power generated by the motor 17, whereby the descending speed is automatically controlled constant.

Description

[Detailed description of the invention] Ki-ni @Expanded meat classic welding layer automatic welding equipment Kll.

Conventionally, Tachimukyōdo** uses a covered arc S* stick and nine moves f#
However, recently gas-shielded arc automatic welding has been applied. By the way, while semi-automatic welding allows for high speed #lII+ compared to manual welding, on the other hand, because it is high speed welding, the K11ll welder follows the lW welding speed and 1ll)-? It requires a high degree of skill to operate WjAIII&. As a device to meet this demand, WI! There is a welding device that welds by lowering a cart carrying an I-torch along a rail arranged parallel to the welding line. In this conventional device, a permanent magnetic reciprocal field DC motor mounted on a trolley is engaged with a rail via a transmission mechanism,
As the cart O descends, the cage O shaft rotates and operates as a generator. Furthermore, motor rotation is possible.
As a result, when the trolley descends, a current flows in the direction of the motor O electric pre-winding to prevent the rotation of the motor O, and brakes are applied to the lowering of the trolley O. ζHere, if the current is large, the braking force applied to the downward movement of the cart becomes large, and if the current is small, it becomes small.In other words, if the cart tries to descend quickly, the braking force becomes large and the descending speed becomes small. , as the descending speed decreases, the braking force also decreases p1 The bogie tries to descend quickly again, and the bogie O speed is controlled so that it remains constant.In addition, the variable resistance S is set in advance to the Ktl1 clause. If this is done, the current flowing through the armature can be adjusted and an arbitrary lowering speed can be obtained. However, with the device configured as described above, if the load on the truck changes, the lowering speed cannot be kept constant. In other words, the lowering speed of the bogie changes instantaneously due to load changes on the bogie, and the braking force changes accordingly, attempting to return the tokoroya to the speed before the load change.However, in this case, the bogie speed changes. The magnitude of the braking force obtained by this does not necessarily match the force required to completely return the truck speed to the speed before the load change. The gong cannot be accurately corrected by the magnitude of the braking force obtained by the electric power generated by the motor, which increases or decreases as a result of the increase or decrease in the speed.

In actual use, the weight of the cart itself does not change during welding, but it is practical when the load on the cart changes depending on the position of the cables attached to the welding torch mounted on the cart (so-called cable handling). There are no problems with this.

The present invention proposes a more stable and simple vertical downward welding device that overcomes the drawbacks of the above-mentioned devices.In this invention, a cart carrying a welding torch is lowered along a rail arranged parallel to the welding line. In the vertical automatic welding device for vertical welding, the cart is provided with a permanent magnet field DC motor and a centrifugal switch mechanism, and the shafts of the DC motor and the switch mechanism are rotated by transmitting the relative motion between the cart and the rail. The vertical automatic connection device is characterized in that it includes a transmission mechanism, and the brushes of the DC motor are connected through contacts of the switch mechanism.

The present invention will be explained in detail below with reference to the drawings. Fig. 1 is a diagram showing a situation in which an apparatus according to an embodiment of the present invention is used to weld a fillet weld formed by base metals 1 and 2, and Fig. 2 is a diagram showing a situation in which an apparatus according to an embodiment of the present invention is used for welding a fillet weld formed by base metals 1 and 2. FIG. 2 is a cross-sectional view showing an example of one aspect of the centrifugal switch mechanism used.

In the figure, the truck 3 has four wheels 4 provided on the truck 3.
(one not shown) is provided so as to be movable along the rail 5. In addition, the rail 5 has permanent magnets 6, 7, 8
．． The rail 5 is fixed to the base material 2 by 9 so as to be parallel to the S tangent 10, and has a rack 11 on its upper surface.

At the top of the truck 3D, a locking pin 12 that engages with the rack 11 is slidably inserted into a bracket 13, while at the bottom of the truck 3! II) - Clamp 15 holding the chain 14
is attached via a support rod 16. In addition, a permanent magnet field DC motor 17 is attached to the trolley 3.
The motor O-shaft 18 is engaged with the rack 11 via gears 19 and 20. The motor shaft 18 is provided with a gear 21 as well as a gear 19, which meshes with a gear 24 fixed to one end of a shaft 23 rotatably supported by a bearing 22. The shaft 23 is provided with a plurality of flexible contacts 26 each having a weight 25 as a contact point at the tip thereof, and the shaft 23 and the flexible contacts 26 are each provided with a catch 29 having fixed contacts 27 and 28. These constitute the centrifugal switch mechanism. This flexible contact is highly flexible, such as a plate groove shape or a piano wire, and does not curve. Note that the fixed contact 27 is a ring-shaped conductor disposed on a circumference centered on the shaft 23), and the fixed contact 28 is a round plate-shaped conductor provided in contact with one end of the shaft 23.

A motor 1740 is connected to a brush (not shown) via a fixed contact 27 and a 21a Lee P line 30.

To explain the operation of the device of the present invention having the above configuration, first, when the locking pin 12 and the rack 11 are engaged, the WI contact torch 14C) switch is pulled to generate an arc, and the locking pin 1'2 is pulled. When the O-engagement with the rack 11 is severed, the trolley 3 starts to naturally descend along the rail 5 using electric power. At this time, since the gear 20 is meshed with the rank 11 provided on the rail 5, the gear 20 also starts rotating at the same time as the trolley 30 descends #1t, and the IH rotation is caused by the gear 11
1 to the motor shaft 111, and at the same time the gear 24
It is also transmitted to the shaft 23 via.

When the motor shaft 18 rotates, the motor 17 operates as a generator to generate electric power. On the other hand, when the shaft 23 rotates, the flexible contact 26 integrated with the shaft within the centrifugal switch mechanism 0-29 also rotates around the shaft 23, and due to the centrifugal force, the flexible contact 26 is moved away from the center of rotation. When the rotational speed increases to a certain level, the fixed contact 2γ comes into contact with the fixed contact 2γ. As a result, the fixed contacts 27 and 28 are electrically connected via the shaft 23, the flexible contact 26 and the main body 25, and the electric power generated by the motor causes the motor 170 armature III#I to A flow in the direction 0IIE that attempts to prevent the rotation of the shaft 180 flows and acts as a brake on the lowering of the truck 30. When braking is applied to the bogie 3, the rotational speed of the shaft 23C1 decreases, the centrifugal force decreases, and the fixed contact 27 (mainly) separates, causing no current to flow through the armature winding), thereby controlling the descent of the bogie 3. (no power) The truck 3 tries to descend quickly again. In this way, according to the round centrifugal switch mechanism shown in Part 2, the contact 27 and the shaft 230 repeatedly make contact and non-contact depending on the rotation speed of the shaft 230, and the braking force against the downward movement of the trolley 3 is applied. Next, we will explain another example of the centrifugal switch mechanism according to Figure 3. ) shaft 23
is supported and rotatably mounted), and the cylindrical body 3
Inside 10, stylus 32 and 33 are sealed together with mercury 34 @3! i is provided. 1fI-Cylinder 31
The upper and lower parts are electrically insulated via the insulator 3), and one end of the stylus 33 is inside the upper part of the cylinder 310.
One end of the stylus 320 is connected to the inner surface of the lower portion, respectively.

Further, contacts 37 and 38 are pressed on the outer surface of the cylindrical body 310 (the pressing mechanism is not shown) and are connected to a brush (not shown) of the motor 17C through a d lead wire 30. Note that the shaft 23 and the gear 21 are provided with their directions changed by 90° via a transmission mechanism consisting of a bevel gear 39, 40 and a gear 41. To explain the operation of the switch mechanism with the above configuration, as the cylindrical body 31 rotates, the mercury 34 is pushed up against the wall of the container 3stD@ due to centrifugal force, and when the rotational speed of the cylindrical body 310 reaches a predetermined value or more, the mercury 34 is 13
4, the conduction between the stylus needles 32 and 33 is cut off. (9) When the rotational speed is below a predetermined value, the mercury 34 falls to the bottom of the container, but the conductive state of the stylus 32 and 33 is maintained.

That is, by engaging the bevel gear 39 on the upper part of the cylindrical body 31 with the rack 11 via the transmission mechanism and the gear 21, 15! As explained above, the control to keep the lowering speed of the trolley 30 constant can be performed automatically.

It should be noted that even if the switch mechanism is an O switch mechanism other than the switch mechanism described above, the effects of the present invention are the same when using other centrifugal switch mechanisms whose contacts open and close depending on the magnitude of centrifugal force.

As described above, the device of the present invention does not require an external 6o power supply to drive the welding cart, and therefore does not require a control couple, a power input cable, etc., which are complicated to handle at the welding site. This is beneficial for the purpose of energy saving and low cost, as it improves operability and eliminates the need for complicated control equipment.In addition, the location of the cables attached to the welding torch reduces the need for the dolly. In other words, it is possible to keep the welding speed constant and make f # contact even in the field where the shape of the object to be welded is such that there are other parts adjacent to the line to be welded and proper cable handling is not possible. It can be done, and its industrial value is great.

[Brief explanation of drawings]

111EI is a diagram showing a situation in which the apparatus according to one embodiment of the present invention is used in a fillet weld, and FIGS. 2 and 3 .
FIG. 1 is a cross-sectional view showing an embodiment of a centrifugal switch mechanism used in a 1m device. 1.2... Base material, 3... Dolly, 4... Wheels, 5...
・Rail・6.7.8.9・Permanent magnet, 10・・
・Welding line, 11... Rack, 12... Locking pin, 1
3-... Bracket, 14... Welding torch, 15...
・Lamp, 16... Support rod 17... Permanent magnet field DC motor, 18... Motor shaft, 19.20.21.
...Gear, 22...Bearing, 23...Shaft, 24...
Gear, 25... Main), 26... Flexible contact, 27
．． 28... Fixed contact, 29... Force A-130...
Lead wire, 31...Cylindrical body, 32.33...Touch sword,
34... water scissors, 35... container, 36... insulator,
37.38...Contact, 39.40...Bevel gear, 4
1...Koji car.

Claims (1)

[Claims] (1) In an automatic under-standing welding device in which nine bogies equipped with iWil)-chi are lowered along rails arranged parallel to the SM belt for welding, the bogies are equipped with a permanent magnet field DC motor and a centrifugal switch. and a transmission mechanism for transmitting the crawling movement between the trolley and the rail 06 to rotate the DC motor and the O-axis of the switch mechanism, and the brushes of the motor are connected through the contacts of the switch mechanism. This is an automatic welding device that is characterized by: