JPS6016467Y2 - Welding trolley - Google Patents

Description

[Detailed description of the invention] This invention relates to a pressurizing mechanism for a truck that welds a circumferential joint of a fixed pipe.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2 (partially enlarged view of FIG. 1).

In the figure, 1 is a fixed pipe (hereinafter referred to as a pipe), 2 is a guide rail with a constant width that is fixed to the outer circumference of the pipe 1 via a seat 3, and 4 is a cart that rotates while being guided by the outer circumference of the guide rail 2. , 5 is a truck frame constituting the truck, 6 a, 6
b is a pair of wheels supported by the truck frame 5, rotated by power obtained from a drive device (not shown) in the truck 4, and in contact with the outer periphery of the guide rail 2; 7 is a welding torch engaged with the truck 4; , 8 is a similarly engaged wire feeding device, and 9 is a similar wire reel.

Reference numeral 10 denotes a pressure device that presses the wheels 6a and 6b via the flange 11 of the guide rail 2 so that the truck 4 does not fall or deviate from the guide rail 2.

12 is a pressurizing frame that constitutes the pressurizing device 10; 13a;
13b is a pair of arms 1 constituting the pressurizing frame 12
A pair of pressure wheels that are only allowed to rotate via shafts 15 fixed to 4a and 14b.

16a and 16b are protrusions 17a and 17 of the truck frame 5.
a pair of pressure knobs that engage screws 19 provided on the horizontal frame 18 of the pressure frame 12 via b and move the pressure frame 12 up and down in parallel to a plane including the axes of the wheels 6a and 6b; It is.

20a and 20b are collars for positioning the truck frame 5 and the pressurizing device 10.

Next, the operation will be explained.

The guide rail 2 is fixed at a position a predetermined distance away from the bevel (not shown) of the pipe.

Next, the platform 4, which is integrated with the pressurizing device 10, is installed on the outer periphery of the guide rail 2.

As shown in FIG. 3, one arm 14a constituting the pressurizing device 12 is connected to a guide portion 21a integral with the horizontal frames 18a, 18b.
21b to the outside.

As described above, the relative distance between the pair of pressurizing wheels 13a and 13b becomes longer than the width of the guide rail 2, and the wheel 6a is easily pressed.

6b can be brought into contact with the outer periphery of the guide rail.

At this time, it can be easily understood that the pressure wheels 13a and 13b are located on the inner surface 22 side of the guide rail 2 flange 11.

Next, the moved arm 14a is guided by the guide portions 21a and 21b.
along the original position, that is, the horizontal frames 18a, 18b end face 2
3 a, 23 Move until it comes into close contact with b, and then tighten the fixing screw 2.
4a and 24b.

With the above steps, the wheels 6a and 6b are attached to the outer circumference of the flange 11, and the pressure wheel 1
3a and 13b are now arranged below the inner surface 22 of the flange 11, and this state is shown in FIG.

Next, the pressure knobs 16a, 16b pass through the holes 25 provided in the protrusions 17a, 17b of the cart 4 and engage with the screws 19.
Turn and pull up the pressure frame 12.

When the screws are evenly screwed in by a predetermined amount, the pressure frame 12 is relatively pulled up parallel to the plane containing the axes of the wheels 6a and 6b, and finally the pressure ring 13a is attached to the inner surface 22 of the flange 11.
, 13b are in contact.

If it is further pulled up by a predetermined amount, a pulling force, in other words, the wheels 6a, 6b and the pressure wheels 13a, 13b act on each other, and a pressurizing force (frictional force) is generated on the flange 11.

The above-mentioned "predetermined amount" means that if the pipe 1 is located horizontally (in other words, if the truck 4 turns on a vertical plane), a weight greater than or equal to the weight of the truck 4 is maintained at any position. It means the amount of frictional force generated.

The collars 20a and 20b of the length corresponding to the gap between the truck frame 5 and the pressure device 10 determined at that position are attached to the screws 1.
9, the trolley frame 5 and the pressure device 10 horizontal frame 18a
, 18b.

Therefore, no matter how many people set up the trolley 4 in any situation, the pressing force will be reproduced.

Through the above process, the device is set in the state shown in FIG. 1, and as described above, power is transmitted to the wheels 6a and 6b by the drive device of the truck 4, and the truck 4 itself slides and turns along the guide rail 2. This is possible.

Although not shown, it goes without saying that a control cable for driving the truck 4 and a welding cable to the welding torch 7 are connected to the truck 4.

The conventional truck operates as described above.

Generally speaking, the working environment for welding work, whether indoors or outdoors, is not good.

In other words, outdoors, there is dust floating around, and even indoors, iron powder from repairing welds or grinding work from adjacent work areas, and welding spatter are exposed to adverse environments. This is a well-known fact.

It is easy to understand that these effects inevitably occur on mechanical devices as well.

Especially for this device, the guide rails are exposed and
Moreover, it cannot be denied that the inner surface of the flange portion has a structure that allows dust to easily adhere to it.

If something similar to the sand or iron powder adheres to the wheel running surface on the outer periphery of the guide rail or the inner surface of the flange, the pressure wheel or wheel will ride on it.

Furthermore, it is reasonable that it is difficult to guarantee that the wall thickness t of the guide rail flange is precisely uniform over the entire circumference.

Therefore, when the above-mentioned situation is encountered, it becomes difficult to guarantee smooth rotation using the conventional method of installing a collar and determining the relative relationship between the wheel and the pressure wheel.

If the elastic force of the arm is not able to fully absorb the force, permanent deformation occurs and the original function of the trolley is impaired.

This idea was made to eliminate the above-mentioned drawbacks of the conventional ones, and one of the pair of pressure knobs was given a spring action, causing the arm to flex against obstacles on the running surface. The object of the present invention is to provide a pressurizing knob that can respond to changes in the arm by immediately varying the pressurizing force.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 5, 26 is an invented pressure knob, 27
28 is a coil spring, 28 is a spring holder that guides and holds the coil spring, 29 is a snap ring built into the end of the spring holder 28, 30 is a holder guide tube that guides the spring holder 28, and 31 is a holder guide tube 30 and a set screw. It is a knob that is integrated by 33.

33 is a female thread that is machined into the knob 31 and engages with the screw 19.

A pressure knob 26 according to the present invention is shown in FIG.

In other words, the coil spring 27 has a spring holder 2 that matches the inner diameter.
8 allows vertical movement, and the collar 34 of the spring holder 28 prevents it from falling.

On the opposite side from the collar 34, the spring holder 28 is guided in a hole 35 of the holder guide tube 30 and is movable up and down on the same central axis.

A snap ring is inserted into the other end of the spring holder 28 , and the snap ring is located inside 36 of the holder guide tube 30 to prevent it from coming off the step 37 of the holder guide tube 30 .

With the above configuration, the coil spring 27 is held without falling off, and if the mutual dimensions are considered, the coil spring 27
It is also possible to assemble it by giving it an appropriate amount of shrinkage.

That is, in this case, the load is applied externally by the coil spring 27, so that the step 37 and the snap ring 29 are assembled in close contact with each other, as shown in FIG.

When a load is applied to the lower part, that is, the collar 34, of the pressure knob 26 in the direction of the arrow shown in the figure, the coil spring 27 is deflected, the spring holder 28 is raised by that amount, and a gap is created between the snap ring 29 and the step 37. It is.

The state is shown in FIG.

The pressurizing knob 26 constructed and operated as described above is shown in FIG. 7 in a state in which it is engaged with the screw 19 of the conventional device.

In FIG. 7, one side of the pair of pressurizing knobs 16a, 16b, which were conventionally incorporated together with the collars 20a, 20b, is replaced with the pressurizing knob 26 of the present invention, and at the same time, the collar 20a, which was incorporated in the pair, is removed.

In this state, it is easy to select the coil spring 27 so that a pressing force equivalent to that of the conventional device can be obtained.

Another thing is that when the same pressing force is obtained, the snap ring 2
9 and step 37 may be selected so that they are not in close contact with each other.

In FIG. 8, for example, when there is dust 38 on the inner surface 22 of the guide rail 2 and the pressure wheel 13a rides on it, the pressure knob 16b, which is the same as the conventional one, is restricted by the collar 20b and is completely screwed in. It is considered a rigid body because it is

Therefore, the influence of the pressurizing ring 13a occurs as a deflection of the arm 14b, which causes a displacement of Δh between the protrusion 17a and the horizontal frame 18a, which is integral with the screw 19 that engages with the pressurizing knob 26 at the other end.

It can be easily understood from the configuration of the pressure knob 26 described above that a displacement of Δh results in the coil spring 27 being deflected by Δh.

In the above embodiment, the coil spring 27 is held by the knob 3.
The pressurizing knob 26 is configured as described above in order to prevent it from separating from the knob 31, but in order to achieve the intended purpose of this invention, the compressed coil spring 27 must be inserted between the knob 31 and the truck frame 17a. It goes without saying that any configuration that exists between the two is sufficient.

Incidentally, the coil spring 27 of the pressure knob 26 in the above embodiment is also connected to the holder guide 30 and the spring boulder 28.
Although the knob 31 is interposed therebetween, it is substantially interposed between the knob 31 and the truck frame 17a.

As described above, according to this invention, one side of the pressure knob has a telescoping action, so that obstacles such as dust can be removed from the running surface of the trolley.
To provide stable bogie turning by being able to immediately respond to the movement of a pressurizing wheel due to variations in the thickness of a guide rail flange, and by increasing the pressurizing force and therefore increasing the frictional force. This is possible.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the configuration of the conventional device, Fig. 2 is a partially enlarged view of the conventional device, Fig. 3 is a top view showing the conventional device before installation, and Fig. 4 is the installed state of the conventional device. A top view showing the
FIG. 5 is a sectional view of a pressure knob according to an embodiment of the present invention;
FIG. 6 is a sectional view showing the same pressurization, FIG. 7 is a partially enlarged view showing the incorporation of the invention, and FIG. 8 is a partially enlarged view showing the same effect. 1...Fixed pipe, 2...Guide rail,
3... seat, 4... trolley, 5...
・Bolly frame, 6a, 6b... Wheels, 7...
...Welding torch, 8...Wire feeding device,
9... Wire reel, 10... Pressure device, 11... Flange, 12... Pressure frame, 13a, 13b... Pressure ring, 14a
, 14b... Arm, 15... Axis, 1
6a, 16b...pressure knob, 17a,
17 b...---Protrusion, 18a, 18h...
...Horizontal frame, 19...Screws, 20a, 20b...
...Color, 21a, 21b...Guidance section,
22...Inner surface, 23 a, 23 b = end surface,
24a, 24b...Fixing screws, 25...
・Hole, 26... Pressure knob, 27...
Coil spring, 28... Spring halter - 129...
... Snap ring, 30 ... Holder guide tube, 31 ... Knob, 32 ... Female thread, 33 ... Set screw, 34 ... ...Brim, 35...Hole, 36...Inside, 37
・・・・・・Dan. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Scope of utility model registration request] (1) A welding cart that welds a circumferential joint while sliding and turning while being guided by a ring-shaped guide rail fixed to the outer periphery of a fixed pipe, holds wheels that contact the outer periphery of the guide rail. a pressurizing frame that holds a pressurizing ring that is disposed at a predetermined distance from the cart frame and that contacts the inner circumferential portion of the guide rail;
A pair of screws provided at both ends of the pressure frame and passing through holes formed at both ends of the truck frame are screwed into the screws and rotated, thereby connecting the wheels and the pressure wheel. a pair of pressure knobs for raising and lowering the pressure frame so that the pressure frame is in pressure contact with the outer circumference and inner circumference of the guide rail, respectively; A welding truck characterized in that a compression spring is interposed between the knob to be screwed together and the truck frame. (2) One of the pair of pressure knobs has a holder guide, a knob that engages with the screw, and a collar that comes into contact with the trolley frame, and is slidable on the guide holder of the above knob. a spring holder provided in the spring holder, the spring holder being interposed between the collar of the spring holder and the holder guide, and being substantially interposed between the pressure knob and the truck frame when the pressure knob is screwed onto the screw; The welding cart according to claim 1, characterized in that the welding cart is comprised of a compression spring.