JPH0565314B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a polishing machine for polishing grooves for butt welding on objects to be welded, such as steel pipes to be butt welded.

BACKGROUND ART Generally, when butt welding steel pipes together, the joining ends of both steel pipes are U-cut or V-cut to ensure a sufficiently good weld build-up.
In addition, to ensure good welding, U-cuts or V-cuts (hereinafter referred to as butt welding grooves) are provided.
The parts are polished to clean them (remove rust, dirt, oil, oxide film, etc.).

Conventionally, the above-mentioned polishing work has been carried out manually by workers using a grinder, etc., but this not only makes it difficult to maintain a constant polishing accuracy, but also forces workers to work excessively. It was also inefficient.

Therefore, in order to solve the above-mentioned problems, the present applicant has already developed a polishing machine that performs the above-mentioned operations using an endless belt-shaped polishing belt in Japanese Patent Application No. 56-106112. As shown in FIGS. 6 and 7, this polishing machine includes a contact wheel 1 whose outer peripheral surface is formed into an R shape, and a plurality of pulleys 2, 3, 4, and 5 stretched between the contact wheel 1 and a plurality of pulleys 2, 3, 4, and 5. A polishing head arm 6 rotatably supports the contact wheel 1 and the pulleys 2, 3, 4, and 5, and a slide table 8 supports the polishing head arm 7 in an up-and-down manner. ,
A boom 9 that supports this slide table 8 so that it can slide horizontally left and right, a lifting block 10 that supports this boom 9 so that it can slide horizontally back and forth, and a column 11 that supports this lifting block 10 so that it can move up and down. The contact wheel 1 is inserted and pressed into the long groove 13 of the object to be polished 12 via the abrasive belt 6, and the object to be polished 12 is sent in the direction of the long groove 13, and the contact wheel 1 is inserted into the long groove 13. The inner surface of the long groove 13 is polished while being guided.

By the way, in order to stabilize the running of the abrasive belt 6 in the above-mentioned polishing machine, it is necessary to maintain the tension of the abrasive belt 6 at an appropriate tension, so in the above-mentioned polishing machine, the tension mechanism 14 is I can't help it.

Conventionally, the tension mechanism 14 includes a slide block 15 that rotatably supports the tension pulley 4, two guide rods 16, 16 that guide and support the slide block 15, and the support member 1.
When the feed screw 17 is rotated with a handle (not shown) attached to the end of the feed screw 17, the threaded relationship between the feed screw 17 and the slide block 15 causes The slide block 15 is configured to slide along guide rods 16, 16, and in conjunction with this, the tension pulley 4 supported by the slide block 15 is moved to tension the abrasive belt 6 with an appropriate tension.

Problems to be Solved by the Invention By the way, since the conventional tension mechanism 14 is disposed between the drive pulley 3 and the idler pulley 5, which are supported at both ends of the polishing head arm 7, the polishing belt 6 is attached to the tension pulley 4. The opening angle between the drive pulley 3 and idler pulley 5 in the middle is obtuse, and even when applying a small tension, it is necessary to move the tension pulley 4 by a large distance, so the tension mechanism 14 is inevitably large. Therefore, the overall balance of the machine was not necessarily good. Furthermore, the tension mechanism 14 requires an operator to manually adjust the tension by rotating the handle every time the abrasive belt 6 is extended by a certain amount, which requires a great deal of effort. Furthermore, since the tension mechanism 14 guides and supports the support member slide block 15 on which the tension pulley 4 is supported by two guide rods 16, 16, the guide rod 1
If dust or the like adheres to the slide block 6 or 16, the dust or the like gets caught between the slide block 15 and the slide block 15, making it impossible to guide the slide block 15 smoothly.

Means for Solving the Problems The present invention has been proposed in view of the above problems, and its technical means consists of an endless belt-shaped belt running stretched between a contact wheel, a drive pulley, a tension pulley, and an idler pulley. An abrasive head arm that rotatably supports an abrasive belt, a contact wheel and each pulley, a slide base that supports this abrasive head arm so that it can be raised and lowered, a boom that supports this slide base so that it can slide in left and right horizontal directions; It is equipped with an elevating block that supports the boom so that it can slide in the front and rear horizontal directions, and a rotating column that supports the elevating block so that it can be raised and lowered and also so that it can rotate, and the contact wheel is connected to the object to be polished via an abrasive belt. In this polishing machine, the tension pulley is rotatably supported on the tip of a tension arm which is pivotally connected to one end of the polishing head arm, and a spring is attached to the tension arm. A feed screw is rotatably supported by a gear box which has one end rotatably attached to the polishing head arm, and is inserted into the spring support, and a slide block is screwed onto the feed screw.
The other end of the feed screw is connected to a tension motor provided coaxially with the rotation center of the gearbox, and a spring is compressed and interposed between the spring receiver and the slide block.

Function Since the present invention arranges the tension pulley and tension mechanism at the end of the polishing head arm as described above, it is possible to apply a large tension to the polishing belt by simply moving the tension pulley slightly.

Embodiment FIGS. 1 and 2 are a front view and a side view showing an embodiment of a polishing machine according to the present invention.

In FIGS. 1 and 2, 21 is an object to be polished, such as a steel pipe, and 22 is an endless belt-shaped polishing belt.

The object to be polished 21 has a long groove 23 with a substantially U-shaped cross section on its outer peripheral surface, which is the surface to be polished, and a turning roller 2 provided on a roller stand 24 so that its position can be adjusted.
5, 25, and is rotated in contact with the direction of the arrow by the turning rollers 25, 25.

The abrasive belt 22 is stretched endlessly between a drive pulley 27 and a tension pulley 28 which are rotatably supported on both ends of the abrasive head arm 26, and a contact wheel 29 and idler pulleys 30, 31 are brought into contact with each other in the middle of the abrasive belt 22. There is.

The drive pulley 27 is the abrasive head arm 26
Rotationally driven by a drive motor 32 provided in
As a result, the polishing belt 22 is rotationally driven in the direction of the arrow.

The tension pulley 28 can adjust the tension of the polishing belt 22 by a tension mechanism 33.

As shown in FIGS. 3 to 5, the tension mechanism 33 is connected to one end of the polishing head arm 26 via a pivot shaft 34, and has a tension pulley 28 at its tip.
A tension arm 35 rotatably supported on a shaft is pivotally mounted, a cylindrical spring receiver 36 is swingably provided on the tension arm 35, and one end of the spring receiver 36 is pivotable to the polishing head arm 26. A feed screw 38 rotatably supported is inserted into the mounted gear box 37, and cam followers 39, 3 are attached to the side surface of the polishing head arm 26 through the feed screw 38.
At the same time, the other end of the feed screw 38 and a tension motor 41 provided coaxially with the rotation center of the gear box 37 are connected to the bevel gears 42 and 43. and a spring receiver 36 on the feed screw 38.
A spring 44 is compressed and interposed between the slide block 40 and the slide block 40, and when the tension motor 41 is driven, the feed screw 38 rotates via the bevel gears 42 and 43, and the feed screw 38 and the slide block 40 are screwed together. Due to this relationship, the slide block 40 slides, and in conjunction with this, the tension arm 35 rotates about the pivot 34 via the spring 44 and the spring receiver 36, and the tension arm 35 is pivoted at the tip of the tension arm 35. Pulley 28 moves to adjust the tension of abrasive belt 22.

Further, the tension mechanism 33 has a limit switch 45 connected to a tension addition lamp (not shown) on the slide block 40, and a stopper 46 on the spring receiver 36 facing the actuator of the limit switch 45. As the slide block 40 slides, the limit switch 45 is turned on and off by the stopper 46.

In addition, the tension pulley 28 can adjust its angle by a tracking mechanism (not shown), and when the position of the abrasive belt 22 is shifted, the side opposite to the position of the abrasive belt 22 is tilted upward.
The position of 2 can be modified.

The contact wheel 29 is made of, for example, hard rubber, and its outer peripheral surface is formed into an R shape that is narrower than the long grooves 23 of the object to be polished 21, so that the polishing belt 22 can be bent into a substantially V-shape without sagging. There is.

The polishing head arm 26 is pivotally attached via a pivot shaft 49 to a slide base 48 provided at the tip of a horizontal boom 47 so as to be slidable in the left and right horizontal directions, and the arm angle adjustment handle 50 allows the polishing head arm 26 to be rotated by a worm wheel. Mechanism (not shown)
The undulation angle can be adjusted through the

The upper boom 47 is supported by a lifting block 51 via a guide roller 52 so as to be slidable in the horizontal direction back and forth, and is supported by a motor 53 for moving the boom back and forth.
It is possible to move forward and backward.

The lifting block 51 is mounted on a column 54 via a guide roller 55 so as to be able to rise and fall.
The boom can be raised and lowered along the column 54 by a motor 56 for raising and lowering the boom. That is, a boom lifting screw 57 is provided vertically on the lifting block 51.
A nut (not shown) screwed into this is driven to rotate in forward and reverse directions by the boom elevating motor 56.

The column 54 is installed on a column turning disk 59 which is rotatably placed on a turning support base 58, and this disk 59 can be turned by a column turning motor 60 and can be locked at any position. being done.

The rotating support base 58 is installed on a cart 61, and the cart 61 is movable on rails 62, 62 provided parallel to the longitudinal direction of the object to be polished 21, so that it can be positioned and fixed at any position. being done.

The polishing operation in the above configuration is as follows.

First, the column turning motor 60 is operated to move the cart 61 with the boom 47 fixed vertically to the object 21 to be polished, and the contact wheel 29 is placed on the turning rollers 25, 25. Long groove (surface to be polished) 23 of abrasive object 21
Place them facing each other on top. Thereafter, the boom longitudinal movement motor 53 and boom lifting motor 56 are operated to adjust the longitudinal and vertical positions of the boom 47 according to the dimensions of the object to be polished 21, and the arm angle adjustment handle 50 is rotated. Adjust the polishing head arm 26 to an appropriate angle and align the contact wheel 29 and polishing belt 22 with the long groove 2 of the object to be polished 21.
3. In this state, when the object to be polished 21 is rotated, the drive motor 32 is operated to rotate the drive pulley 27, and the polishing belt 22 is rotated.
is rotated to polish the long grooves 23 of the object to be polished 21.

Further, when the polishing belt 22 is extended during the polishing operation, the tension mechanism 34 causes the polishing belt 22 to extend.
Adjust the tension in step 2 as follows. That is,
When the polishing belt 22 extends, the tension arm 35 rotates counterclockwise in FIG. 3 about the pivot 34 via the spring receiver 36 due to the spring force of the spring 44. moves in the same direction and separates from the actuator of the limit switch 45, and as a result, the limit switch 45 moves away from the actuator of the limit switch 45.
Turn on and the tension addition lamp lights up. When this lamp lights up, the tension motor 41 rotates the feed screw 38 to slide the slide block 40 toward the tension arm 35. Then, the spring 44 compressed and interposed between the spring receiver 36 and the slide block 40 is compressed and its spring force is increased, so that the pressing force of the tension pulley 28 against the abrasive belt 22 increases, and the abrasive belt 22
tension increases. And abrasive belt 2
When the tension 2 reaches a predetermined value, the actuator of the limit switch 45 attached to the slide block 40 comes into contact with the stopper 46 attached to the spring receiver 36, turning off the limit switch 45, and the lamp is accordingly turned off. Therefore, the drive of the tension motor 41 is stopped to complete the tension adjustment.

Effects of the Invention As explained above, in this invention, the tension pulley and tension mechanism are arranged at the end of the polishing head arm, so that the angle at which the polishing belt opens around the tension pulley becomes an acute angle.
Therefore, by slightly moving the tension pulley, the abrasive belt can be tightened strongly.
Accordingly, the tension mechanism can be manufactured in a small size. As a result, the overall balance of the apparatus is improved, and stable polishing work can be performed.

The present invention can be applied not only to polishing grooves for butt welding of steel pipes, but also to polishing linear welds at both ends of rolled steel plates and welds between steel plates.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view showing one embodiment of the polishing machine according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is an enlarged front view of the tension mechanism, and Figs. 4 and 5 are Fig. 3. A cross-sectional view along the A-A line and the B-B line,
FIG. 6 is a schematic front view showing a conventional polishing machine, and FIG. 7 is a side view thereof. 21...Object to be polished, 22...Abrasive belt, 26...Abrasive head arm, 27...Drive pulley, 28
...Tension pulley, 29...Contact wheel, 33...Tension mechanism, 35...Tension arm, 36...Spring receiver, 37...Gear box, 3
8...Feed screw, 40...Slide block, 44...
Spring, 45... Limit switch, 46... Stopper, 47... Boom, 51... Lifting block, 54...
Column, 58...Swivel support base, 61...Dolly.

Claims (1)

[Claims] 1. An endless belt-shaped abrasive belt that runs stretched between the contact wheel, drive pulley, tension pulley, and idler pulley, an abrasive head arm that rotatably supports the contact wheel and each pulley, and this abrasive head arm that can be raised and lowered. A supported slide base, a boom that supported the slide base so as to be slidable in the left and right horizontal directions, a lifting block that supported the boom so as to be slidable in the front and rear horizontal directions, and a lift block that was capable of being raised and lowered, and In a polishing machine, the polishing machine is equipped with a rotatable column supported so as to be rotatable, and the contact wheel is pressed against the surface of the object to be polished through an abrasive belt to perform polishing, and the tension pulley is connected to the polishing head arm. A gear box is rotatably supported on the tip of a tension arm pivotally connected to one end, a spring receiver is swingably provided on the tension arm, and one end of the spring receiver is swingably attached to the polishing head arm. A rotatably supported feed screw is inserted, a slide block is screwed onto the feed screw, and the other end of the feed screw is connected to a tension motor provided coaxially with the pivot center of the gearbox. A polishing machine characterized in that the spring receiver and the slide block are connected to each other, and a spring is compressed and interposed between the spring holder and the slide block.