JPS6139153B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the configuration of a self-propelled semi-automatic welding machine, and in particular to adjustment so that a small trolley that runs while holding torches can stably hold various torches and run smoothly. This relates to a self-propelled semi-automatic welding machine equipped with a device.

Conventionally, in semi-automatic welding such as CO ₂ welding, an operator moves a welding torch along a welding line while maintaining a constant distance between the workpiece and the tip of the torch nozzle. Although this type of welding work is convenient because the torch can be handled manually, it is difficult to maintain the tip of the torch nozzle at a constant distance from the surface of the material to be welded and move it at a constant speed, which requires skill and can also cause worker fatigue. big. Furthermore, it is extremely difficult for even experienced welders to perform good welding continuously for a long period of time.

For this reason, it has been proposed to provide a running wheel to support the welding torch (Japanese Patent Publication No. 51-38658, Japanese Patent Application Laid-Open No. 52-78732). All of these proposals are characterized in that a specific part of the welding machine is welded while being held by an operator, which allows the welding machine to be significantly downsized and a good welded part to be easily obtained. In addition, the present applicant has proposed a new self-propelled semi-automatic welding machine that holds a welding torch and runs automatically, in which the held torch pivots and rotates in a free direction and runs smoothly. It has been effective.

By the way, such semi-automatic welding machines run while dragging cables of 2 meters or more, and the welding machine may lose its balance and fall over due to the cable's drag resistance or load, or the running wheels may fall. may become idling and make it impossible to drive. Therefore, welding operators often have to hold and hold these self-propelled semi-automatic welding machines by hand. Further, depending on the welding means and welding posture, the shape of the torch to be held may differ, and the center of gravity may be higher or unevenly distributed, which may amplify the above-mentioned drawbacks. Therefore, in the self-propelled semi-automatic welding machine as described above, depending on the shape and structure of the torch to be held, it can be adjusted to stably support it, and it can be stabilized without losing the resistance of the pulling cable. It is required that the vehicle be driven in a safe manner. In addition, these self-propelled semi-automatic welding machines are required to be lightweight and compact, and easy to handle.The above-mentioned stable running can be adjusted not only by the type of torch, but also by the cable length and load. It is desirable that it can also be adjusted by

The present invention has focused on these points and aims to provide a self-propelled semi-automatic welding machine that is easy to handle and runs stably. However, the present invention is configured such that the mounting position of the torch holding member or the distance between the axes of the traveling carriage can be changed and adjusted depending on the torch that is mounted and held.

The present invention will be explained in detail below based on the drawings, which show one example of a specific implementation of the invention.
The present invention is not limited to these illustrated examples, but can be implemented in the same manner even if the configuration or design is changed without departing from the spirit of the descriptions described above and below. The embodiments also do not limit the invention. FIG. 1 is a side view of a self-propelled semi-automatic welding machine to which the present invention is applied, and FIG. 2 is a plan cross-sectional view taken along the cutting line - in FIG. 1 in the direction of the arrow, with a portion broken away. 3 shows a left front view of FIG. 1, and FIG. 4 shows a left rear view of FIG. 1. In these figures, 1 indicates a torch, which constitutes a grip 4, to which a cable 5 is connected and a nozzle pipe 7 is attached to the front part. Further, a switch 6 is provided on the grip portion 4 to operate generation and stop of the arc. The nozzle pipe 7 is fixed to a torch holding member 8 that is configured to be slidable on a bracket attached to an elevating member, which will be described later. Reference numeral 9 indicates the mounting tightening screw. On the other hand, a traveling device that holds and moves such a torch 1 is composed of a traveling drive section 2 and a torch mounting section 3, and the traveling drive section 2 is connected to a frame 10.
A drive motor 11 is housed inside the drive motor 11, and electricity is supplied from a cord (not shown) (FIG. 4). A pinion 11' attached to the output shaft of the motor 11 engages with a gear 12' fixed to a drive shaft 12 loosely supported on the frame 10, thereby rotating the drive shaft 12 and causing the drive shaft 12 to rotate. Rear wheels 13, 13 are attached to both ends of the shaft 12. Note that 14 and 14' each indicate a cover, which is formed of a suitable perforated plate. The frame 10 of the drive unit 2 configured in this manner is made of a thick material, and is designed to press the rear drive wheels 13 against the running surface.

On the other hand, the structure of the torch attachment part 3 is that the front wheel support member 1
5 and a pivot member 16 rotatably supported by the support member 15, and the front wheel support member 15 is provided so as to be slidable with respect to the frame 10 of the drive unit 2. It is recommended that these slides be fixed in position and adjustable. These configuration means may be such that two support rods fixed to the support member 15 are loosely inserted into insertion holes provided in the frame 10 and are secured with set screws provided in the frame 10. As shown in the cross-sectional view in FIG. 6 and the drawing in FIG.
It is preferable to form an insertion groove in which a pinion 21 that engages with the rack is disposed in a part of the groove. The pinion 21 is fixed to a shaft 22 passing through the frame 10, and a rotation handle 23 is fixed to one side of the shaft 22, and the other end of the shaft is a screw shaft 22' with a tightening handle 24. When screwed on, the mounting position of the support member 15 can be adjusted using the handle 23, and by tightening the tightening handle 24, the pinion 21 can be crimped and positioned on one side of the frame 10. Also, adjustment and operation are easy.

The front wheel support member 15 configured in this manner has a front wheel support shaft 17 freely supported by penetrating it in the vertical direction, and a front wheel shaft 18 (the third
) is fixedly installed, and front wheels 19, 19 are attached to both ends thereof. Set hoops 17a and 17b are fixed to the upper and lower surfaces of the support member 15 of the support shaft 17 passing through the support member 15, respectively, to regulate the height position of the front wheel 19. Therefore, the top surface of the set hoop 17b becomes a surface that supports the load on the front side of the drive section 2 via the support member 15, and also becomes a sliding surface when the front wheel 19 makes a rudder turn. In addition, a pivot hole formed in the pivot member 16 is fitted into a support shaft 17 projecting upward from the set hoop 17a, so that the pivot member 16 can be pivoted, and the load is supported by the top surface of the set hoop 17a. It becomes a turning sliding surface of the turning member 16. Further, the support member 15 is provided with a locking knob 20 that passes through the support member 15 in the vertical direction, and the knob 20 is protruded by a coil spring so that its shaft end is always in contact with the top surface of the set hoop 17a within the hole of the support member 15. Forced. An engagement hole into which the protruding shaft end fits is formed in the set cope 17a, and the position of the engagement hole is set to the axis of the knob 20 when the rear wheel drive shaft 12 and the front wheel shaft 18 are parallel to each other. Formed so that they fit together. Further, the knob 20 is provided with a mooring device that prevents the protruding shaft end from protruding from the support member 15 by pulling down and rotating the knob 20. When using the mooring device, the support member 15 and the set hoop 17a are free. The front wheels 19 can be slid and turned in a free direction. Instead of such a knob 20, a set screw for the support shaft 17 may be provided on the outer peripheral surface of the support member 15 within a range that does not impede the rotation of the pivot member 16, or these may be fixed by other means. A similar effect can be obtained by locking the set hoop and the support member 15.

On the other hand, the pivoting member 16 is pivotally supported by a portion of the support shaft 17 protruding from the set hoop 17a, and its load is supported by the set hoop 17a, and it pivots and slides. Although not shown in the drawings, the pivot member 16 may also be provided with a knob that engages with the support shaft 17, and the engagement knob is connected to the support shaft 17 or the set hoop 1 fixed thereto.
7a. Further, these engagements may be made by the engagement hole formed in the set hoop 17a, or by the locking knob 20 of the front rake wheel 19. The pivoting member 16 constructed in this manner has an oval shape as shown in FIG. 2, and can pivot in any direction around the supporting shaft 17. Further, a sliding groove extending downward is formed on the opposite side of the pivoting member 16, and the elevating member 25 is loosely inserted into the groove. As the elevating member 25, a member having an appropriate cross-sectional shape can be used, but in the illustrated example, the elevating member 25 has a circular groove as the sliding groove.
5 with a circular cross section. Further, the front side of the sliding groove forms an open slit in the front surface of the pivoting member 16. On the other hand, the lifting member 25 is provided with a rack tooth 25a on the rear surface side thereof, and is engaged with a pinion 26 provided exposed in a part of the sliding groove. The pinion 26 is housed in a cavity 27 provided so as to be connected to the sliding groove, and a shaft 28 is provided so as to pass through the rotating member 16 in the cavity.
Fixed to. Similarly to the adjustment and locking device of the support member 15, the shaft 28 has an operating handle 29 fixedly attached to one end thereof, and has a screw shaft formed at the other end to which a tightening handle 30 is screwed. Therefore, by rotating the operation handle 29 with the tightening handle 30 loosened, the elevating member 25 can be raised and lowered in the free direction, and by tightening the tightening handle 30, the pinion 26 can be moved to the side surface of the cavity 27. Alternatively, rotation of the shaft 28 can be restrained by pressing the operating handle 29 against the rotating member 16, thereby stopping the elevating member 25 at the free height position. Further, such an adjustable detention means is advantageous because it allows both lifting and lowering operations and detention operations with a single shaft.

On the other hand, the surface opposite to the rack formation of the lifting member 25 slightly projects from the open slit formed in the front surface of the rotating member 16, and the nozzle pipe 7 is attached to the projecting surface.
Bracket 31 for attaching the holding member 8 of
Attach. When installing the bracket 31, the upper part of the bracket 31 is suspended by a mounting screw 33, and is also installed by a threaded screw 34 so as to restrict its inclination. That is, the bracket 31 is formed with a number of holes through which the screws 34 pass, and the elevating member 2
By selecting the through hole, the bracket 31 can be held vertically or at an angle (see Fig. 9). .

Further, a mounting portion 32 formed integrally or separately is formed at the lower part of the bracket 31, and the nozzle pipe holding member 8 is mounted to the mounting portion 32. Although any suitable holding member 8 can be used, it is convenient to support the holding member 8 at two points and tighten it at one point as shown in the figure, since it can accommodate various diameters of the nozzle pipe 7. A mounting portion 8' bent into an L-shape is formed on the holding member 8, and the mounting portion 8' is attached to the mounting portion 32 of the bracket 31. At the time of attachment, the holding member 8 is attached to the attachment part 32 so that it can be slid freely and stopped at an appropriate position, and the length of the sliding distance can be selected depending on the shape and size of the attachment part 32. Although the figure shows a configuration in which walls are formed on both sides of the mounting part 8' to embrace both sides of the mounting part 32,
The holding member 8 is attached on a flat surface with the wall surface removed.
The pivoting of the bracket may be adjusted, or other brackets may be provided to change the inclination and mounting distance. FIG. 7 is a bottom view of the mounting portion from below, showing that the mounting distance between the support member 8 and the elevating member 25 can be adjusted by a long hole formed in the mounting portion 8'. With this configuration, the distance between the torch holding member 8 and the front wheel 19 can be freely adjusted. When the self-propelled semi-automatic welding machine is used for fillet welding, the bracket 3 suspended from the lifting member 25 is used as shown in FIG.
1 is tilted at a predetermined angle and fixed, and the nozzle pipe 7 is fixed.
be installed at an angle. Furthermore, when performing fillet welding,
For example, it is recommended to provide a guide device along the standing board 37. And the guide device is the first
As shown in Figure 0, a forked arm rod 36 with guide rollers 35, 35' loosely supported is attached to the ventral side of the frame 10 constituting the travel drive section 2. Adjustable configuration. Although the figure shows the arm rod 36 formed integrally, other rods can be interposed to freely adjust the installation distance and the inclination between the axes of the guide rollers 35, 35' and the running line of the semi-automatic welding machine. Alternatively, the distance at which the guide rolls 35, 35' are arranged can be freely changed.

In the self-propelled semi-automatic welding machine of the present invention constructed in this manner, the distance between the axes of the rear wheel 13 and the front wheel 19 can be changed depending on the type of torch 1 held. Alternatively, the distance between the front wheel and the torch holding member 8 can also be freely adjusted. According to the experience of the present inventors, when using a welding torch such as that illustrated in FIG.
By locating the front wheel 19 close to the front wheel side point B by about 30 to 40% of the distance between the front wheel 19 and the grounding point B, stable running was obtained. Therefore, the shape of the nozzle pipe 7, the mounting position of the grip part 4, or the nozzle pipe 7 may be changed.
By changing the fixing position of the holding member and the gripping part 4,
center A moves, but since this welding machine can be adjusted as described above, the holding member 8 and the front wheel 19
The distance between the two axes and the distance between the axes can be changed, and the center position can be changed, resulting in extremely stable running. As a result, the self-propelled semi-automatic welding machine of the present invention (1) maintains a constant distance (extension) between the surface to be welded and the torch nozzle and performs welding at a constant speed, eliminating the need for skill and requiring no manual labor. Good welding is achieved even when the welding occurs.

(2) In addition to the conventional effects such as being able to perform welding work continuously for long periods of time, (3) Depending on the type and shape of the torch, the center of the grip or the center of gravity can be moved by traveling drive. It can be installed at an appropriate position of the wheel and the rudder guide wheel, making it possible to stabilize travel and continue smooth travel. It is also easy to handle because it is configured so that these adjustments can be made easily.
It can be a highly versatile self-propelled semi-automatic welding machine.

[Brief explanation of the drawing]

FIG. 1 is a side view of a self-propelled semi-automatic welding machine to which the present invention is applied, and FIG. 2 is a plan cross-sectional view taken along the cutting line - in FIG. 1 in the direction of the arrow, with a portion broken away. 3 is a left front view of FIG. 1, and FIG. 4 is a right rear view of FIG. 1, partially cut away. 5 is an explanatory view of the turning in FIG. 2, FIG. 6 is a cross-sectional view along the cutting line - in FIG. 1 in the direction of the arrow, FIG. 7 is a partial bottom view of FIG. 1,
8 is an explanatory diagram of the operation of FIG. 1, FIG. 9 is a front view showing another example of welding, and FIG. 10 is a bottom view of the guide member illustrated in FIG. 9. DESCRIPTION OF SYMBOLS 1...Torch, 2...Traveling drive part, 3...Torch attachment part, 4...Gripping part, 5...Cable, 6...Switch,
7... Nozzle pipe, 8... Holding member, 9... Tightening screw, 10... Frame, 11... Motor, 12... Drive shaft, 13... Rear wheel, 14... Cover, 15... Supporting member, 16... Swivel member, 17... Support column, 18... Front wheel shaft, 19... Front wheel, 20... Locking knob, 21... Pinion, 22... Shaft, 23... Handle, 24... Tightening handle, 25... Lifting member, 26... Pinion, 27...
Hollow part, 28... Shaft, 29... Handle, 30... Tightening handle, 31... Bracket, 32... Mounting part, 3
3...Mounting screw, 34...Threaded screw, 35...Guide roller, 36...Arm rod, 37...Standing plate.

Claims (1)

[Scope of Claims] 1. A small self-propelled semi-automatic welding machine that runs while holding a welding torch, which is provided with front wheels and rear wheels at the front and rear, and at least one of the front and rear wheels is configured as a drive wheel. 1. A self-propelled semi-automatic welding machine, characterized in that the welding torch is adjustable so that the center of the welding torch grip is located between the front wheels and the rear wheels. 2. The self-propelled semi-automatic welding machine according to claim 1, wherein the position adjustment of the gripping part is configured to change the mounting distance between the front wheel and the rear wheel. 3. The self-propelled semi-automatic welding machine according to claim 1 or 2, wherein the position adjustment of the gripping part is configured to change the distance between the welding natch holding part and the front wheel support member. 4. The self-propelled semi-automatic welding machine according to claim 2, wherein the distance changing means between the front wheels and the rear wheels is constructed by slidably inserting a front wheel support member into the rear wheel side frame. 5. A self-propelled semi-automatic welding machine according to claims 1 to 3, wherein the welding torch is held so as to be pivotable in a substantially horizontal plane. 6 In claims 1 to 4 or 5,
A self-propelled semi-automatic welding machine whose welding torch is rotatable in a nearly vertical plane. 7 In claims 1 to 5 or 6,
The wheels installed at the front and rear of this self-propelled semi-automatic welding machine consist of the rear wheel being the driving wheel and the front wheel being the rudder driven wheel. 8 In claims 1 to 6 or 7,
A self-propelled semi-automatic welding machine in which the center of rotation of the front wheel and the center of rotation of the welding torch are substantially perpendicular to each other. 9 In claims 1 to 7 or 8,
A self-propelled semi-automatic welding machine with a torch holding device that can be raised and lowered.