JPS6055262B2 - sanding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polishing machine for polishing, for example, the inner surface of a long groove in a cylindrical part of a boiler or a welded part for joining copper pipes.

In general, manufacturing the cylindrical parts of boilers, steel pipes, etc. involves a process of welding and joining them.

It is necessary to make a V-cut or an X-cut to form a welded portion in this joint 7 portion, to perform gouging, and to polish the inner surface of the long groove having a substantially U-shaped cross section formed by the gouging. This is because the build-up welding cannot be performed satisfactorily unless the carbon layer formed on the surface of the long groove by gouging is removed. Conventionally, this type of polishing work has been carried out manually by workers using a grinder or the like, but this requires excessive labor on the workers and is inefficient. Therefore, as shown in FIG. 1, an automatic device is also used in which a rod-shaped grindstone 3 is inserted into the long groove 2 of the object to be polished and the object to be polished 1 is fed and polished. However, the steel pipe etc. to be polished has a diameter of 1rr1. From several meters
It has a diameter of , and is usually not a perfect circle due to its own weight, and feeding in the circumferential direction cannot be performed with high precision due to the poor accuracy of the feed roller, and the long groove 2 is It is sent while swinging vertically and horizontally. Therefore, in this automatic device, a mechanism for swinging the grindstone 3 from side to side while applying an appropriate compressive force requires a complicated control unit and is very expensive. In addition, when this automatic device is used, the grindstone 3 tends to grind the corner 2'' of the long groove 2 of the object to be polished due to the large compressive force of 20 to 25 k9, and the opening width L of the long groove 2 tends to be reduced. As a result of unnecessarily widening, the amount of welding increases, the amount of welding rods used increases, and the economic efficiency of welding deteriorates.The present invention is an improvement on this in view of the above-mentioned drawbacks. .

That is, in the present invention, since polishing of the long grooves requires only removing the carbonized layer on the surface, a large compressive force is not required, and furthermore, the long grooves can be easily swung from side to side. This was made by paying attention to the fact that the feed in the circumferential direction is relatively slow, and has the configuration described below.

In FIGS. 2 to 4, 4 is an arm-shaped swinging member;
5 is rotatably fixed on the swinging member 4. The contact wheel 5 is made of hard rubber, and the width e of the outer peripheral portion of the contact wheel 5 is set narrower than the width L of the long groove 2 of the object 1, as shown in FIG.

Further, reference numerals 6, 7, 8, and 9 are pulleys rotatably supported on the swinging member 4, 6 and 7 are idler pulleys, 8 is a tension pulley, and 9 is a driver pulley. Note that the idler pulley 6 has corners on both sides formed into gently rounded surfaces. Reference numeral 10 denotes a tension adjustment mechanism that supports and fixes the tension pulley 8 on the swinging member 4, and includes two guide rods 12, 12 that guide and support the support part 11 of the tension pulley 8, and the support part 11 of the tension pulley 8. 11, a tension adjustment handle 14 fixed to the adjustment rod 13, and a compression spring 15 fitted into the adjustment rod 13.

Further, reference numeral 16 denotes a support shaft that supports the swinging member 4 so as to be swingable in the vertical direction (in the direction of arrow a), and is coaxial with the idler pulley 7 (however, it is not connected to the idler pulley). 17 is a moving table on which the support shaft 16 is fixed; 18 is a moving table 1
7, a drive belt 19 transmits the rotation of the motor 18 to the driver pulley 9; 20 an endless belt stretched between the contact wheel 5 and the pulleys 6, 7, 8, and 9; It is a coated abrasive paper with an abrasive grain layer formed on its outer surface, has a width wider than the width e of the outer circumference of the contact wheel 5, and is provided with a large number of scattered through holes as required. .

21 is a pressure weight that is guided by a guide rod 22 on the swinging member 4 and fixed at an arbitrary position with a fixing screw 23; 24 is a weight that allows the movable table 17 to be slid in the left and right horizontal directions (in the direction of arrow b); It is a support base that supports it, and has slide bearings, etc.

26 is a boom with the support base 24 fixed to its tip; 26 is a lift block that supports the boom 25 so as to be slidable in the horizontal direction (direction of arrow c) back and forth; by rotating the horizontal movement handle 27, the rack and pinion can be moved. The connected boom 25 is moved back and forth to fix the boom 25 at an arbitrary position.

Reference numeral 28 denotes a double column that supports the lifting block 26, and the lifting block 26 is moved up and down by a threaded rod 29 fixed at the center thereof and fixed at an arbitrary position.

30 is a traveling truck that supports the double column 28; 31;
is a column turning section installed between the traveling truck 30 and the double column 28, and by loosening the column turning positioning lever 32, the double column 28, together with the boom 25 and the swinging member 4, etc., is turned to an arbitrary position.

Reference numeral 33 denotes a rail on which the traveling truck 30 runs, 34 a brake handle attached to the traveling truck 30, and 35 a left and right traveling handle also attached to the traveling truck.

Further, 1 is an object to be polished, such as a copper pipe, 2 is a long groove with a U-shaped cross section, which is the surface to be polished provided on the outer peripheral surface of the object to be polished, and 36 is a long groove for holding the object 1 to be polished; This is a roller stand that uses rollers 37, 37 to feed the object 1 to be polished for polishing. The polishing operation in the above configuration is as follows.

First, with the boom 25 fixed perpendicularly to the object 1 to be polished, the traveling carriage 30 is moved so that the contact wheel 5 faces the long groove 2 of the object 1 to be polished. Then, by moving the pressurizing weight 21 on the guide rod 22 on the swinging member 4, the contact wheel 5 applies an appropriate compressive force to the bottom surface of the long groove 2 via the abrasive cloth paper 20, for example, 10 kg~
Adjust so that it is pressed with I5k9, and fix it in that position with the fixing screw 23. Then, rotate the motor 18,
While running the abrasive cloth paper 20, the rollers 37, 37 of the roller stand 36 are rotated to feed the object 1 to be polished. Then, when the cloth abrasive paper 20 approaches the contact wheel 5 with both sides bent slightly inward by the idler pulley 6 whose corners are rounded, it forms a chevron along the outer periphery of the contact wheel 5. It is bent and inserted into the long groove 2 by the contact wheel 5 and pressed as shown in FIG. Both sides of the abrasive cloth paper 20 are pressed against the inner surface of the long groove 2 by centrifugal force, and the inner surface of the long groove 2 is polished with an appropriate compressive force. The width of the abrasive coated paper 20 is preferably the same as or slightly larger than the length of the inner surface of the long groove 2 in the width direction. Then, the inner surface of the long groove 2 is polished uniformly. Furthermore, even if there is a portion 2'' protruding from the inner surface of the long groove 2, the abrasive coated paper 20 is only pressed by centrifugal force, so the corner 2'' of the long groove 2 can be sharpened like a conventional grindstone. Here, the first point, which is a unique effect of the first invention of the present invention, will be described.

That is, in this polishing state, the object to be polished is
37, the swinging member 4 to which the contact wheel 5 is fixed continues polishing vertically with a constant compressive force, following the movement of the long groove 2 in the vertical and horizontal directions. In other words, for vertical movement, the swinging member 4 is
The support shaft 16 is rotatably supported by the support base 24, and horizontal movement is provided by the support shaft 16 being slidably supported by the support base 24. Then, a certain compressive force determined by the position of the pressurizing weight 21 acts,
The long groove 2 of the object 1 to be polished, such as a steel pipe, is uniformly polished.
If we assume that there is no mechanism for copying vertically and horizontally,
Since the long groove 2 is fed by swinging vertically and horizontally, the contact wheel 5 may jump out of the long groove 2 or the abrasive cloth 20
Cutting accidents are likely to occur due to strong local force being applied to the parts. Note that this abrasive cloth paper 20 does not necessarily have to have a large number of scattered through holes, but if there are through holes, the abrasive cloth paper 20 becomes more likely to bend.
It enters the long grooves 2 smoothly, improves air inflow and outflow, improves heat dissipation, prevents seizure, and extends the life of the abrasive cloth paper. Furthermore, although the above explanation has been about polishing the inner surface of a long groove of a steel pipe with a diameter of about 1 m, polishing of a steel pipe with a larger diameter can be done by moving the lifting block 26 above the double column 28, as shown in the dashed-dotted line in FIG. As shown in the figure, it is only necessary to perform polishing by placing the contact wheel 5 facing the object to be polished 1'', and long grooves on the outer periphery of objects to be polished having various diameters can be polished.Next, the second aspect of the present invention The second point, which is a unique effect, will be described.

That is, when carrying out the first invention, the contact wheel 5 does not necessarily have to be installed in the position shown in FIG. Even if the tip was polished, the aforementioned effects could be sufficiently obtained.
Then, as shown in FIGS. 2 and 4, the contact wheel 5 is installed, and the angle θ at which the abrasive cloth 20 opens with respect to the pulleys 6 and 7 on both sides of the contact wheel 5 is set to an obtuse angle. Then, the cloth abrasive paper 20 guided to the contact wheel 5 enters the long groove 2 without any force. In other words, when the abrasive cloth paper 20 deforms into a mountain shape along the contact wheel 5, the parts on both sides of the abrasive paper 20 become loose and distorted, but when the angle θ is wide open, the amount of slack is dispersed, The distortion is small. To explain this in reverse, if the contact wheel 5 were fixed at the position of the idler pulley 6, the traveling abrasive paper 20 would be bent at a steep angle, so the slack would be concentrated on both sides of the abrasive paper 20. As a result of entering the long groove 2 in a highly wrinkled and wrinkled state, the force acts locally on the abrasive cloth paper, easily causing breakage accidents and shortening the life of the abrasive cloth paper. Becomes shorter.
Therefore, if the contact wheel 5 is to be installed at the tip of the swinging member 4, that is, at the position of the idler pulley 6, a contact wheel with a large diameter must be used, and the arrangement of the pulleys 6, 7, 8, and 9 must be adjusted. We must devise ways to increase the angle of the polishing position. However, with the configuration of the second invention, even if the diameter of the contact wheel 5 is small, the slack on both sides of the abrasive cloth paper 20 can be reduced, and polishing can be carried out easily. In other words, with the configuration of the second invention, the diameter of the contact wheel 5 can be reduced, and the other pulleys 6, 7, 8, 9, the swinging member 4, the motor 18, etc. related thereto can be made smaller. This allows the entire device to be made small and inexpensive. Note that the structure of the second invention is more effective as the contact wheel 5 is brought closer to the idler pulley 6 on the tip side of the swinging member 4. That is, the abrasive cloth 2 is bent into a chevron shape by an idler pulley 6 whose outer periphery is rounded.
0 travels to the contact wheel 5 while being bent, so the abrasive cloth paper 20 in the contact wheel 5
This allows for smoother entry into the long groove 2. Also, the contact wheel 5 is connected to the idler pulley 6.
If the idler pulley 6 is also replaced with a contact wheel 6'', the long groove 2 can be polished simultaneously with the two contact wheels 5 and 6''. two contact wheels 5,
The cloth abrasive paper 20 traveling between the grooves 6 and 6 can also be plunged into the long grooves 2 and polished. In addition, in the above embodiment, the annular long groove 2 provided on the outer periphery of a steel pipe, etc. was polished, but in the present invention, when manufacturing a steel pipe, etc., a sheet metal is bent into a cylindrical shape, and the end faces are welded. It can also be used for polishing straight long grooves (shown in the figure).

In this case, the steel pipe or the like should be fed linearly to the contact wheel 5, or the support stand 24 supporting the spindle 16 should be used.
It is possible to automatically feed the straight line using another mechanism. As explained above, the first aspect of the present invention includes a contact wheel whose outer circumferential width is narrower than the groove width of the object to be polished, and a contact wheel which is stretched between the contact wheel and one or more pulleys. An endless strip of abrasive paper that runs in a U-shape around the contact wheel, a swinging member that rotatably supports the pulley and the contact wheel, and this swinging member is constantly rocked vertically during the polishing process. a support shaft that is movably pivoted and that allows the abrasive cloth paper to contact the groove of the object to be polished via a contact wheel; a support base that supports the support shaft so as to be able to slide in the horizontal direction; A pressurizing weight is set at an appropriate position on the member and is used to generate a pressing force on the coated abrasive paper against the object to be polished through the contact wheel portion during the polishing process. The contact wheel is inserted into the long groove of the object to be polished in a U-shape and pressed, and the object to be polished is sent in the direction of the long groove, and while the contact wheel is guided by the long groove, the inner surface of the long groove is leveled under the pressure action of a pressurizing weight. Since the polishing is performed in a state where it can freely swing in the vertical direction around the spindle, during the polishing process, the contact wheel part, that is, the abrasive paper that comes into contact with the long grooves of the object to be polished, changes the shape of the object to be polished. Polishing can be performed by automatically following the contact wheel.Also, since the width of the outer periphery of the contact wheel is narrower than the groove width of the object to be polished, the cloth abrasive paper can be easily inserted into the groove of the object to be polished. It can be pressed, and the inner surface of the groove of the object to be polished can be polished with high efficiency by automatically expanding and pressing into contact with the inner surface of the groove of the object to be polished by the action of the centrifugal force of the running abrasive paper.

Further, in the second invention, since the abrasive cloth paper is stretched and guided at an obtuse angle with respect to the pulleys on both sides with the contact wheel as the center, the abrasive cloth paper can be guided in a U-shape at the contact wheel portion. This process is carried out easily and does not forcibly create local creases on the abrasive cloth paper, which not only prevents the abrasive cloth from breaking and extends its life, but also prevents the groove surface of the object being polished from being broken. This allows for stable surface contact and greatly contributes to obtaining a smooth finished surface.

[Brief explanation of drawings]

Fig. 1 is a sectional view illustrating conventional long groove polishing using a grindstone, Fig. 2 is a front view of an embodiment of the present invention, Fig. 3 is a side view thereof, Fig. 4 is a perspective view thereof, and Fig. 5 is a sectional view showing the polished state. DESCRIPTION OF SYMBOLS 1... Object to be polished (steel pipe), 2... Long groove, 4... Swinging member, 5... Contact wheel, 6, 7... Idler pulley, 8... Tension pulley , 9・
... Driver pulley 10... Tension adjustment mechanism, 16... Support shaft, 17... Moving table, 18... Motor, 19... Drive belt, 20... Abrasive cloth paper, 2
1... Pressure weight, 24... Support stand.

Claims (1)

[Scope of Claims] 1. A contact wheel whose outer circumferential width is narrower than the groove width of the object to be polished, and a contact wheel stretched between the contact wheel and one or more pulleys to form a U-shape. an endless belt-shaped abrasive paper that runs along the surface of the abrasive paper; a swinging member that rotatably supports the pulley and the contact wheel; A support shaft that allows the abrasive cloth paper to contact the groove of the object to be polished through the support shaft, a support base that supports the support shaft so as to be slidable in the horizontal direction, and is set at an appropriate position on the swinging member, It consists of a pressurizing weight for generating pressurizing force on the abrasive coated paper against the object to be polished through the contact wheel part during the polishing process, and the abrasive coated paper is inserted into the long groove of the to-be-polished object through the contact wheel in a U-shape. The object to be polished is sent in the direction of the long groove, and while the contact wheel is guided by the long groove, the inner surface of the long groove is
A polishing machine characterized by polishing in a state where it can freely swing vertically about a horizontal support shaft under the pressure action of a pressure weight. 2. A contact wheel whose outer circumferential width is narrower than the groove width of the object to be polished, and an endless belt-shaped contact wheel that is stretched between the contact wheel and one or more pulleys and runs in a U-shape on the contact wheel portion. A rocking member rotatably supports the abrasive cloth paper, the pulley and the contact wheel, and this rocking member is pivoted so as to be able to swing in the vertical direction at all times during the polishing process. a support shaft that can come into contact with the groove of the object to be polished, a support base that supports the support shaft so that it can slide horizontally, and a contact wheel that is set at an appropriate position on the swinging member and is being polished. and a pressurizing weight for generating pressurizing force on the abrasive cloth paper to the object to be polished through the swing member, and the tension guide angle of the abrasive cloth tensioned on the swinging member is set with respect to the contact wheel. While forming an obtuse angle with the pulleys on both sides, the abrasive cloth paper is inserted and pressed in a U-shape into the long groove of the object to be polished through the contact wheel, and the object to be polished is sent in the direction of the long groove, and the contact wheel is A polishing machine characterized in that the inner surface of the long groove is polished while being guided by the long groove in a state where it can freely swing in the vertical direction about a horizontal support shaft under the pressure action of a pressure weight.