JPH0725018B2 - Polishing head for stone - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing head for stone materials, and more particularly to a polishing head suitable for a continuously operating polishing machine.

[0002]

2. Description of the Related Art It is known that a continuous polishing operation for a stone material is carried out by using a polishing machine having a large number of polishing heads.
This polishing machine consists of a bed on which a belt supporting the stone to be polished slides, and a polishing head acting on the bed through a truss fixed to the bed itself continuously performs polishing work. .

This known type of polishing head basically consists of a fixed flange fixed to a beam that slides on the base of the polishing machine, inside which is connected a rotary spindle with a vertical axis. A polishing body having a friction outer peripheral surface is rotated by a transmission gear mechanism.

[0004]

The material to be treated rarely exhibits a perfectly horizontal surface, and during the polishing operation the polishing element collides with the irregularities on the surface of the stone to be treated, so that all the known materials are known. The polishing head is subject to vibration and shock.
In particular, such vibrations and shocks are observed not only when the spindle shaft and the polishing element are connected to each other in a fixed type, but also when an elastic joint is interposed between the spindle shaft and the polishing element so as to be buffered. Rather, the presence of such dampers increases vibration and sometimes leads to breakage of the processed slab.

Another drawback of the known polishing heads is that the vertical pressure is not evenly distributed over the surface to be polished. Another disadvantage is that the tool does not completely rest on the working surface if the working surface is very uneven. An object of the present invention is to solve the above-mentioned drawbacks and to realize a polishing head that does not cause damage to a slab to be processed without impact or vibration during polishing.

Another object of the polishing head of the present invention is to provide a more uniform pressure distribution on the surface to be polished than is obtained with known types of polishing heads and to obtain uniform wear of the friction surface cylinder. .

[0007]

SUMMARY OF THE INVENTION These and other objects are achieved by fixing the upper part of a rotating vertical spindle to a grinding machine via a connecting element having a through hole in the center thereof which is mounted inside by a bearing. A flange, and a coaxial body fixed to the lower part of the spindle by a mechanical connecting means, the central body being centered by a bearing corresponding to the intermediate region of the outer surface of the spindle, and having a plurality of radially distributed tubular chambers. Inside each chamber, a shaft having a horizontal axis supports a rotating sleeve supporting a tubular sleeve having a friction outer peripheral surface, and a gear and a pinion meshing with each other. A movement unit configured to transmit to each horizontal shaft having a sleeve having a friction outer peripheral surface, The bottom wall of the box and the lower end of the vertical spindle are mutually connected via a spherical joint which allows the box itself to generate small vibrations during rotation during polishing by the shaft supporting a sleeve with friction surfaces. Together, the small vibrations are connected by bearings between the connecting elements that connect the bottom wall of the rotating box to the lower part of the vertical spindle, and the outer intermediate region of the spindle and the central body of the rotating box that is attached to the motion unit. This is achieved by a stone polishing head suitable for a continuously operating polishing machine, characterized in that it is damped by an elastic element interposed between the spindle and a coaxial conical gear.

According to the polishing head of the present invention, vibration is hardly generated during the work, and the material is not damaged. In addition, the reduced vibrations result in a finish of superior quality, as compared to previously known types of polishing heads.
The above objects and advantages will be explained in more detail on the basis of the preferred embodiments shown in the drawings.

[0009]

EXAMPLES As shown in FIG. 1, a polishing head 1 of the present invention.
Consists of a fixed flange 2 that is rigidly connected by a connecting element 3 to the base of a grinder (not shown). It is mounted by bearings 4. A flange 10 is connected to the lower part 8 of the rotary spindle 6 by means of a toothed coupling 9, which secures the rotary spindle 6 to the bottom wall 51 of the box 12 by means of screws 11. In this way, when the spindle is rotated by receiving the rotary motion from the shaft of the polishing machine (not shown), the box 12 surely follows the rotary spindle 6. The shaft is connected to the head flange 70 of the spindle 6. In particular, between the lower part 8 of the rotary spindle 6 and the bottom wall 51 of the rotary box 12,
Spherical joint 5 connected to the end of vertical spindle 6
2 is interposed, and the joint is a bottom wall 5 of the rotating box 12.
1, which are connected via a spherical contour 53 having a radius 54. This spherical joint 52 allows the rotary box 12 to make several revolutions about the center of rotation defined by the intersection of the radius 54 and the axis 7 of the spindle 6.

The box 12 has a bell-shaped upper part 13 and is connected via an inner double lip seal 15 of an annular groove 14 formed in the fixed flange 2. During rotation, this known type of double lip seal 15 corresponds to a ring 71 made of wear-resistant material inserted in the fixed flange 2, corresponding to the bell-shaped portion 13 of the rotating box 12.
To the fixed flange 2.

In FIG. 2, the rotating box 12 is represented as a plurality (six in the example shown) of tubular chambers 16, to the inside of each of which a shaft 17 having a horizontal axis 18 is connected. . Each horizontal shaft 1
7 is supported by a bearing 19 which is connected to the inside of the tubular chamber 16 and which projects radially towards the outside of the tubular chamber 16 which is connected to a tubular sleeve 22 by means of a conical coupling 21 and a fixing screw 20. Has an end that is A layer 23 of friction material is attached to the outer peripheral surface of each tubular sleeve 22. In order to obtain the desired polishing action, the box 12 and the friction material layer 2
The tubular sleeve 22 that supports 3 must rotate about an axis. For this purpose, the vertical spindle 6 has a cylindrical gear 3 fixed thereto by a key 31.
0, the key engages a cylindrical ring 32 having internal teeth, and the ring is fixed by a bearing 33 to the fixed flange 2
Is fixed inside and is eccentric with respect to the vertical axis 7 of the spindle 6 by a distance 134. The cylindrical ring 32 having internal teeth is mounted on the spindle 6 by a bearing 35 and is engaged with another cylindrical gear 34 which is an idle gear having a different number of teeth from the gear 32. This gear 34 rotates at a different rotation speed than the gear 32, and the rotation is caused by the rotation of the connecting pin 3
8 is transmitted by the roller bearing 37 to the spindle 6 to the conical gear 36 which is an idle gear. Particularly, the connection is made in an annular chamber 39 formed in the cylindrical gear 34, and the pin 38 is housed in the annular chamber 39 with an elastic ring 40 having a flexible coupling action interposed therebetween. Finally, the conical gear 36
It meshes with a conical pinion 41 keyed to the end of each horizontal shaft 17 supporting the tubular sleeve 22 carrying a layer of friction material 23 that does not project outside.

When the vertical spindle 6 is rotated by this movement mechanism, at the same time, the box 12 is moved by the vertical axis 7 of the box 12.
, And each tubular sleeve 22 rotates about its horizontal axis 18. Then, the above-mentioned combined movement causes a frictional action on the surface 50 of the stone material. When the friction surface 23 of the tubular sleeve 22 encounters irregularities on the working surface 50, it supports the horizontal shaft 17 that supports them.
Bends, and this bend is transmitted to the spherical joint 52.
This is because the shaft 17 is fixed inside the tubular chamber 16 belonging to the box 12 and the bottom wall 51 of the box belongs to the spherical joint 52. As a result, each horizontal shaft 1 forming the polishing head
All stresses 7 are the intersections of the radius 54 of the spherical surface 53 of the spherical joint 52 and the vertical axis 7 of the spindle 6 55.
The rotation box 12 vibrates centering around.

In order to damp this vibration and elastically recover the horizontal shaft 17 after rotation, the elastic sleeve 57 is used.
Interpose on each screw 11 connecting the bottom wall 51 of the rotary box 12 to the flange 10 for fixing the lower end 8 of the spindle 6. Similarly, for the same purpose, the central body 59 of the rotating box 12 has an elastic sleeve 57 interposed between the central region 58 of the spindle 6 and the conical gear 36 which transmits the rotation to the conical pinion 41 of the horizontal shaft. is doing.

According to the mechanism described above, each time one or more tubular sleeves 22 encounter irregularities on the polishing surface of the work piece 50, the spindle 6 in the rotary box 12 will be described.
Elastic vibration occurs around the point 55 on the vertical axis 7 of
It is possible to prevent shocks and vibrations that damage internal parts of the polishing head or deteriorate the polishing quality of the material. In any case, the risk of damaging the stone slab during work is avoided.

As for the tubular sleeve 22 carrying the friction material layer 23 on the outer peripheral surface, the outer peripheral diameter is not always strictly constant. As a result, there is a need for automatic compensation for this small difference in diameter during the polishing action. For this purpose, the friction material layer 23 of each tubular sleeve 22 has a thin rubber layer 62 for the tubular sleeve 2
2 an annular shell 61 maintained at a constant distance from the outer peripheral surface
Circular cross-section ring 60 mounted on the sleeve 22 by
Supported by. In this way, the difference in diameter during the polishing operation is compensated by the deformation of this rubber layer 62.

When the rubber layer 62 is present and the surface to be processed has irregularities, the rotary box 12 is attached to the spherical joint 52.
By vibrating it around, the friction material layer 23 can be brought into close contact with the surface to be processed. Moreover, the spherical joint also has the function of making the distribution of the load on the surface to be processed even more uniform during the polishing action. In the embodiment of the present invention, it is possible to adopt another mechanism for the motion unit that transmits the rotation from the vertical spindle 6 to the horizontal shaft 17 supporting the tubular sleeve 22 carrying the friction material 23, for example. The form of the fixed flange and the rotating box can also be modified, and the number of tubular sleeves that are part of the polishing head itself can be modified according to the needs of the user.

It should be noted that these are all within the scope of the invention.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view of a polishing head of the present invention along a vertical plane passing through the axis of a rotating spindle.

FIG. 2 is a bottom plan view of the polishing head of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Polishing head 2 ... Fixed flange 3 ... Connection element 4 ... Bearing 5 ... Spindle upper part 6 ... Rotating spindle 7 ... Vertical shaft 8 ... Spindle lower part 10, 11 ... Mechanical connection means 16 ... Tubular chamber 17 ... Shaft 22 ... Sleeve 23 ... Friction material layer

Claims (7)

[Claims] 1. A flange (2) fixed to the grinder by means of a connecting element (3) having a through hole in the center of which the upper part (5) of a rotating vertical spindle (6) is mounted inside by means of a bearing. ) And a mechanical connection means (10, 10) to the lower part (8) of the spindle.
11) is coaxially fixed, and the central body (59) is fixed by the bearing (4) to the intermediate area (5) of the outer peripheral surface of the spindle.
8) a plurality of radially distributed tubular chambers supporting a tubular sleeve (22) having a friction outer peripheral surface (23) by a shaft (17) having a horizontal axis (18) inside each A rotating box (12) having (16), gears and pinions (30, 32, 34, 3) meshing with each other.
6, 41) and is adapted to transmit the rotational movement of the vertical spindle (6) to each said horizontal shaft (17) comprising a rotating box (12) and a sleeve (22) having a friction outer peripheral surface (23). The bottom wall (51) of the rotating box (12) and the lower end (8) of the vertical spindle (6) support a sleeve having a friction surface during rotation during polishing. The shafts cooperate with each other through a joint (52) having a spherical surface (53) that allows the box itself to generate small vibrations, said small vibrations being the bottom wall (51) of the rotating box.
Between the connecting elements connecting the lower part to the lower part (8) of the vertical spindle, and to the outer intermediate region (58) of the spindle and to the kinematic unit, which is connected to the central body of the rotating box by means of bearings coaxial with the spindle. A stone polishing head (1) used in a continuously operating polishing machine, characterized in that it is damped by an elastic element interposed between it and a conical gear (36). 2. A kinematic unit for transmitting the rotation of a vertical spindle to a horizontal shaft carrying a tubular sleeve with a friction surface, comprising a toothed cylindrical gear (30) keyed to the spindle (6). , A further cylindrical toothed gear (34) mounted as an idle gear on the spindle itself, both gears having a cylindrical ring (32) rotatably mounted on a fixed flange (2) by a bearing (33). ), The gear (34) is rotatably mounted on a vertical spindle (6) and is connected to a toothed conical gear (36) by a pin (38). The gear (36) is rotatably mounted coaxially with respect to the vertical spindle and meshes with the conical pinion (41) so that each conical pinion (4)
A polishing head according to claim 1, characterized in that 1) is keyed and fixed to the end of each horizontal shaft (17) supporting a tubular sleeve (22) carrying a friction surface (23). . 3. Pins (38) for connecting between a toothed cylindrical gear (34) coaxially and rotatably mounted on a vertical spindle (6) and a toothed conical gear (36). Has one end fixed inside the annular chamber (39) fixed to the gear (34) and the other end conical gear (3).
A polishing head according to claim 2, characterized in that it is fixed to 6), whereby an elastic sleeve (40) is interposed between the chamber (39) and the end of the pin (38). 4. The rotating box (1) in which the spherical joint (52) is along an interlocking spherical contour (53).
Ring nut (72) fixed to the lower end (8) of the vertical spindle (6) which is connected to the bottom wall (51) of (2)
A polishing head according to claim 1, characterized in that the radius of curvature of the spherical contour (53) intersects the vertical axis of rotation (7) of the spindle (6). 5. The elastic element interposed between the parts connecting the bottom wall (51) of the rotating box (12) and the lower part (8) of the vertical spindle (6) is tubular elastic material made of elastic material such as rubber. A sleeve (56) for connecting the bottom wall (51) of the rotating box (12) to a flange (10) fixed to the bottom of the vertical spindle (6) itself (1).
The polishing head according to claim 1, wherein the polishing head is arranged coaxially outside of 1). 6. An outer central region (58) of the spindle and a conical gear (36) provided coaxially with the spindle (6).
The elastic element interposed between and is one or more elastic tubular sleeves (57) made of an elastic material such as rubber and provided coaxially with the spindle (6). Polishing head. 7. Each of the tubular sleeves (22) comprises:
The sleeve itself has a frictional surface layer (23) carried by a tubular ring (60) which is housed in an annular shell (61) and mounted coaxially, said ring having an elastic surface (62) in contact with the surface to be processed. The polishing head according to claim 1, wherein the polishing head is supported by the polishing head.