JPH0123271B2 - - Google Patents

Description

Detailed Description of the Invention (Object of the Invention) The present invention is applicable to rough grinding and finish grinding of billets or large thick steel plates, replacement of large grindstones, or finish grinding of heavy objects. Regarding a grinding unit equipped with a grinding head for both roughing and finishing, equipped with two types of grindstones, the purpose of which is to eliminate the huge amount of labor and time loss due to transfer to the disk, etc., and at the same time perform high-quality grinding. It is.

(Prior art) Conventionally, when grinding billets or large thick steel plates,
When the rough grinding in the first process is completed, the rough grinding wheel is removed from the head and replaced with a finishing whetstone, or the finishing whetstone is attached to the workpiece after rough grinding in order to finish grinding in the second process. I had to transfer it to another grinder and set it up again. In this case, the weight of the grinding wheel is large, and the weight of the object to be ground is also extremely large, so in both cases, a huge amount of labor and time is lost, and there are many problems that reduce the quality of the ground product. Ta.

(Structure of the Invention) In view of the above-mentioned problems, the present invention provides a rough grinding head at one end of a rotatable arm attached to a movable machine base on a cart of one grinding machine, and a finish grinding head at the other end. After attaching the head, the endless belt hooked to the pulley of the drive motor is freely hooked to the pulley of either the rough grinding head or the finish grinding head, and the adjustment pulley inscribed in this endless belt is automatically adjusted. The present invention is explained with reference to the drawings of the embodiments. In Figs. 1 to 3, a grinding machine 1 for both roughing and finishing is shown in Figs. Rails R laid on the floor F, wheels 2, 2, rolling on the R,...
Supports 4, 4, ... established on a trolley 3 equipped with ...
A machine stand 6 is movably mounted on beams 5 and 5' installed perpendicularly to the rails R and R, and a grinding unit 7 for both roughing and finishing, which will be described later, is installed on this machine stand 6.

To explain the grinding unit 7 in detail, in FIGS. 4 and 5, the machine stand 6 is connected to the beams 5, 5'.
(Fig. 2), and a drive motor 10 is disposed on a horizontal upper beam 9 of a cross-sectional frame 8 attached to this machine stand 6.
Hanging walls 11,1 extending downward from both sides of the upper beam 9
Bearings 12, 12' are attached to the lower end of 1', and a rotating arm 14 is fixed to a rotating shaft 13 whose both ends are supported by the bearings 12, 12'. First rotating shaft 15 pivotally supported on head G1
the grinding wheel 16 on one end and the second grinding head G on the other end.
The other grinding wheel 18 is attached to the second rotating shaft 17 which is pivotally supported by the second rotating shaft 17.
Install. Then, one bearing 1 of the rotating shaft 13
A pinion 20 is fixed to the protruding end 19 from 2',
A rack 22 attached between the pistons (not shown) of hydraulic cylinders 21 and 21' fixedly installed opposite this bearing 12' is engaged with the pinion 20, and the hydraulic cylinder 2 is attached to the outside of one hanging wall 11.
The tip 25 of the rod 24 of No. 3 is connected to the rotating arm 1.
It can be freely engaged and detached from the locking holes 26, 26' bored in the side surface of 4. One end of the ∠-shaped hook 28 is pivoted to a bracket 27 provided on the front surface of the upper beam 9, and the other end of the hook 28 is pivoted to the tip of a rod 30 of a hydraulic cylinder 29 pivoted to the lower surface of the upper beam. Then, the adjustment pulley 31, which is pivoted on the top of this hook 28, is
It is brought into contact with the inner surface of the endless belt 35 that is hung around the pulley 32 of the rotating shaft 15 or the pulley 33 of the second rotating shaft 17 and the motor pulley 34 of the drive motor 10 on the upper beam 9, and When activated, the adjustment pulley 31 pushes the endless belt 35 from inside to maintain appropriate tension.

(Operation of the invention) To explain the operation of the invention with reference to the drawings of the embodiment, in Figs. 1 to 3, when the workpiece to be ground W is set between the rails R and R on the floor F, The carriage 3 of the board 1 moves in the direction of arrow P or P', and the machine platform 6 mounted on the upper beams 5 and 5' moves in the direction of arrow Q or P'.
At a position where the grinding unit 7, which has been moved in the Q' direction and has the rough grinding wheel 16 facing downward and the finish grinding wheel 18 facing upward, is almost directly above the grinding location (not shown) of the workpiece W. The machine stops, rough grinding is performed by the rough grinding wheel 16, and then the finish grinding wheel 1
8, which will be described in more detail.

In FIGS. 4 and 5, the drive motor 10
When activated, the motor pulley 34 rotates counterclockwise, causes the endless belt 35 to run in the same direction, and rotates the first pulley 32 counterclockwise, so that the rough grinding wheel 16 rotates counterclockwise. The material to be ground W is ground by rotating in the direction. and,
When the grinding of the workpiece W by the grinding wheel 16 is completed, the locking hydraulic cylinder 23 is activated to retract the rod 24, and the engagement between the tip 25 of the rod 24 and the locking hole 26 is released. The rotating arm 14 is rotatable about the rotating shaft 13. At this time, when the hydraulic cylinders 21 and 21' for rotation operate to move the intermediate rack 22 in the horizontal direction, the rotation shaft 13 coaxial with the pinion 20 meshed with this rack 22 also rotates in the direction of arrow A. This rotation axis 13
The rotating arm 14 fixedly attached also rotates in the direction of arrow R, and the finish grinding wheel 18 located at the upper end moves to the lower end, and the hydraulic cylinder 23 for locking is operated to protrude the rod 24 and its tip end. 25 engages with another locking hole 26' formed on the side surface of the rotating arm 14 at a position symmetrical to the locking hole 26 with respect to the rotating shaft 13, and the rotating arm 14 rotates 180 degrees from the previous position. It will be fixed in the specified position. When the rotating arm 14 rotates, as the first pulley 32 at the lower end rises, the distance from the motor pulley 34 becomes shorter and the endless belt 3
5 becomes slack, and the tension acting on the endless belt 35 decreases. Then, when the rotating arm 14 rotates to the horizontal position, the second pulley 33 moves toward the endless belt 35.
comes into contact with the inner surface of When the tension acting on the endless belt 35 weakens as the rotating arm 14 rotates, the hydraulic cylinder 29 for adjusting the tension operates to project the rod 30, so that the ∠-shaped hook 28
rotates in the direction of arrow B using the upper end as a fulcrum and pushes the adjustment pulley 31 up to the position shown by the chain line, so the endless belt 35 is always hung with a constant tension, so the endless belt 35 is not pulled and cut, or Too loose, motor pulley 34, pulley 32,
It will never deviate from 33 mag. The rotating arm 14 is fixed to the machine base 6, and as the first pulley 32 separates from the endless belt 35, the second pulley 33 comes into contact with the endless belt 35 and is hung thereon. After the rough grinding wheel 16 and the finish grinding wheel 18 have been vertically swapped, the drive motor 10 is activated to perform finish grinding.

(Effects of the Invention) The present invention provides a grinding machine with a freely rotatable rotating arm attached to a movable platform on a cart, and a grinding wheel for rough grinding attached to one end of the rotating arm. A grinding wheel for finish grinding is installed at the other end, and the rotating arm is rotated and rotated with respect to the machine base by a hydraulic cylinder.
An adjustment pulley is provided inscribed in an endless belt that can be freely locked and is hung between the drive motor pulley and the pulley of one of the grinding wheels, and the adjustment pulley can be moved in and out using a hydraulic cylinder for adjustment. The tension of the endless belt is automatically kept almost constant when the rotating arm rotates, so
When grinding large billets or large thick steel plates, etc., when moving from rough grinding in the first step to finish grinding in the second step, it is sufficient to simply rotate the rotary arm, and the grinding wheel is It is possible to eliminate the great amount of labor and time required to change the grinding material or to transfer the material to be ground.

[Brief explanation of drawings]

Fig. 1 is a front view of the grinding machine embodying the present invention, Fig. 2 is the same, a side view, Fig. 3 is the same, a plan view, Fig. 4 is the same, an enlarged front view of the main parts, and Fig. 5 is the same. It is an enlarged side view of the same. (Explanation of symbols of main parts), 1...Grinding machine, 6
... Machine base, 7 ... Grinding unit, 10 ... Drive motor, 14 ... Rotating arm, 16 ... Grinding wheel (rough), 18 ... Grinding wheel (finishing), 20 ... Pinion, 21, 21 ′...Hydraulic cylinder (for rotation),
22... Rack, 23... Hydraulic cylinder (for locking), 25... Tip, 26, 26'... Locking hole,
29... Hydraulic cylinder (for adjustment), 31... Adjustment pulley, 32... First pulley (for rough sanding),
33... Second pulley (for finishing abrasive), 34... Motor pulley, 35... Endless belt, W... Material to be ground.

Claims (1)

[Claims] 1 A machine base 6 attached to a cart of a grinding machine so as to be freely movable, and first and second grinding heads G1 and G at both ends.
2, the center part of which is rotatably supported by a rotation shaft 13 disposed horizontally with respect to the machine base 6, and which is rotated via a rotation means; a first rotary shaft which is rotatably supported by the first grinding head G1 in a protruding state and has a rough grindstone 16 attached to one end protruding from the grinding head and a first pulley 32 attached to the other end; 15, rotatably supported by the second grinding head G2 with both ends protruding;
A finishing whetstone 18 is attached to one end protruding from the grinding head.
The second rotary shaft 17 has a second pulley 33 attached to the other end thereof, a fixing means for fixing the rotary arm 14 to the machine stand when the rough whetstone 16 or the finishing whetstone 18 is in the grinding position, and the machine. An endless belt 35 is wound around either the motor pulley 34 of the drive motor 10 provided on the stand, the first or second pulley, and the pulley around which the endless belt 35 is wound is rotated by the rotating arm 14. A grinder equipped with two types of grindstones, which can be used for both roughing and finishing. Grinding unit with grinding head.