JPH044200Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an apparatus for smoothing and polishing the end face of a compression test specimen such as concrete or rock.

Conventionally, this type of device has been designed to place a specimen such as concrete or rock on the top of an abrasive plate that is supported horizontally and rotates at a low speed in a constant direction, and then uses the weight of the specimen to separate the specimen from the abrasive plate. The contact pressure was obtained.

As a result, not only the required polishing time was long, but also the polished surface of the specimen had the drawback that it could not be kept strictly perpendicular to the center line of the specimen or flatness could not be maintained.

Because it was necessary to leave a small amount of play between the specimen and the holder that held it, this play made the polished surface of the specimen extremely unstable, and the For example, if the polished surface is even slightly inclined to the center line, it may result in poor perpendicularity during finishing, or hardness,
Due to the sand grain size, etc., the specimen swayed (precession) during polishing, and only the periphery was extremely polished, resulting in a curved surface finish with medium and high heights, making it impossible to expect a highly accurate finish.

Furthermore, in the above-mentioned polishing equipment, since it uses diamond sand, there is a lot of noise, and in the above-mentioned equipment and vibration-type equipment, the abrasive often wears away the parts with low hardness, leaving only the hard parts and the surface. It had drawbacks such as an uneven surface.

In addition, handling these devices requires considerable skill, is expensive, and is mechanically complicated, resulting in heavy weight and lack of ease of use.

Therefore, the present invention provides an apparatus capable of polishing the polished surface of a specimen more accurately and efficiently at high speed.

That is, the most important point is that the abrasive plate is pivotally supported on a horizontal axis, and the abrasive plate is rotated at a high speed while repeatedly oscillating at a predetermined angle, and at the same time, the specimen is moved in the horizontal direction. It is characterized by this.

The embodiment shown in the drawings will be described in detail below. On a movable frame 25, a support 26 with a horizontal stand 1 fixed to its upper end is erected, and on the horizontal stand 1, a pillar 26 is pivoted with a bearing 2. Two swing frames 4 ₁ , 4 2 are pivotably supported by the swing shaft 3 , and both swing frames 4 1 , 4 ₂ are pivotably supported by the swing shaft ₃ .
By pivoting a shaft 5 with an abrasive plate 6 fixed to the upper end of 4 ₂ at a position facing the tip surface of the specimen 22 such as concrete or rock, the abrasive body a provided on the plate surface is attached to the surface of the specimen 22. It rotates in contact with the polishing surface, and a motor 1 is attached to the lower end of the swing frame 4 ₁ .
4 is mounted in an axial direction parallel to the shaft 5, and a tuning band 8 is hung between the pulley 9 on the output shaft of the motor 14 and the pulley 7 on the shaft 5, so that the shaft 5 can be rotated at high speed. Electric motor 1 set on the bottom of horizontal table 1
The crank plate 12 at the end of the shaft of 3 and the shaft 10 protruding from the middle of the lower half of the swing frame 4 ₁ are connected via a connecting rod 11, and the crank plate 1 is rotated by the rotation of the electric motor 13.
The drive unit A is constructed so that both the swing frames 4 ₁ and 4 ₂ swing in response to the swing vibration of the drive unit A.

In this case, the electric motor 13 may be set on the swing frame 4 ₁ or 4 ₂ and the crank plate 12 and the horizontal table 1 may be connected to the connecting rod 11 .

Further, a dovetail-fitted feed plate 15 is installed on the upper surface of the horizontal table 1 near one end, and the feed plate 15 is operated by a handle 20 of a feed screw 19 installed horizontally in the center to connect a worm gear or other suitable transmission mechanism. A specimen 22 such as concrete or rock is placed on the V-shaped holder 17 which is fixed on the feed table 15 so as to move forward or backward through the feed table 15. Installed deterrent position adjustment column 18
The upper surface of the specimen 22 is applied by the upper restraining cam 16 and fixed to the holder 17, thereby configuring the specimen supply mechanism B.

In the above, the restraint position adjustment column 18 is provided on the side surface of the holder 17, but as an exception, the feed bar 1
It may also be installed directly on the top surface of 5.

Incidentally, in the above-mentioned apparatus, the dust generated by polishing the concrete is suctioned from the dust collector 24 through the vacuum hose 21 to constantly keep the inside and outside of the apparatus clean.

In addition, wet polishing is possible by cooling the polishing plate and pouring water onto the polishing surface, which also serves to remove clogging.

The present invention is constructed as described above, but the series of operations will be described below. First, the sizes of the applicable specimens for the present device are 50Φ×100L, 100Φ×200L,
The main targets are 3 types of 150Φ x 300L,
It is also fully applicable to other special sizes.

Therefore, such a cylindrical concrete specimen 22 of the specified standard (JIS) was placed in a holder 17 with the surface to be polished.
It is placed on the holder 17 in a state slightly protruding from the inner end and tightened with the restraining cam 16.

That is, the end surface of the specimen 22 is in a state of slightly protruding from the holder 17 and the abrasive body a of the abrasive plate 6.
After holding it so that it is not in contact with
By tightening the restraint cam 16 and stepping on the foot switch 23, the electric motor 14 is started, and the polishing plate 6 at the tip of the shaft 5 is rotated at high speed in a predetermined direction via the adjustment band 8.

At the same time, the electric motor 13 also rotates, and the eccentric movement of the crank plate 12 causes the swing frame ₄₁ to swing at a constant amplitude (angle b) about the swing shaft ₃ through the link rod 11. Therefore, the center O ₂ of the polishing plate 6 constantly changes its position with respect to the specimen 22.

In this state, the specimen 22 is moved gradually forward (in the direction of the arrow) by rotating the handle 20 on the feed bar 15, and the tip is brought into light contact with the abrasive body a, while the feed is applied slightly. The end face will be polished in a short time.

Next, when the polishing is finished, the specimen 22 is moved backward by reversing the handle 20, and the restraining cam 1
It is released from the holder 17 by loosening 6.

In this way, the surface to be polished of the specimen 22 can be completely smoothed in a single operation, and depending on the nature of the material, it may be used repeatedly while checking the situation, but in any case, the end surface can be polished in a short time. It is possible to finish the specimen 22 while maintaining a smooth surface and a high degree of perpendicularity to the center line of the specimen 22.

When the sizes (outer diameters) of the specimens are different, the restraining cam 16 is moved on the position adjustment column 18 for adjustment, and then the restraining cam 16 is rotated to tighten the specimen 22.

As described above, the device of the present invention has an extremely simple structure, and although two independent motors were used for each function in this embodiment, independent motors are not necessarily required; Therefore, the polishing plate can be rotated and oscillated.

Therefore, if only one electric motor is used, the cost will be lower and the weight of the device itself can be reduced.

Other than that, the most important feature of this invention is that the specimen is supported horizontally without any play as it moves forward toward the polishing plate, so that the polished surface does not become a curved surface with a middle height as in the case of conventional methods, and its flatness is improved. high,
Moreover, the perpendicularity of the specimen to the cylindrical axis is excellent, and since the polishing plate 6 is oscillated while being rotated, even if there is a slight irregularity in the flatness of the abrasive body a (diamond grinding wheel), the oscillation can be avoided. This movement results in even polishing, resulting in even better flatness and squareness than before.

In addition, it is extremely easy to handle, does not require special skill, and does not require abrasives, and the polishing plate has a high speed unlike before, so the time required for polishing is significantly shortened. This is an effective and highly practical idea.

[Brief explanation of the drawing]

FIG. 1 is a side view of the polishing apparatus of the present invention, FIG. 2 is a sectional view taken along line XX in FIG. 1, and FIG. 3 is an explanatory diagram of the operation. DESCRIPTION OF SYMBOLS 1... Horizontal table, 6... Polishing plate, 4 ₁ , 4 ₂ ... Swinging frame, 13, 14... Electric motor, 17... Specimen holder, 22... Specimen.

Claims (1)

[Scope of utility model registration request] The swinging frames 4 ₁ , 4 ₂ which are swung by an electric motor 13 installed on the horizontal stand 1 are pivotably supported by swinging shafts installed horizontally on the horizontal stand, and the upper end of the swinging frame is A polishing plate 6 for polishing the end face of a specimen such as concrete or rock is pivotally attached to the part, and the polishing plate 6
An electric motor 1 installed on the rotating shaft of the rotary frame and the lower part of the swing frame
4 are appropriately interlocked, and a specimen holder 17 for holding a specimen on the horizontal table is installed so as to move forward and backward toward the polishing surface of the polishing plate,
While electrically swinging the polishing plate at a predetermined angle,
1. An end face polishing device for a specimen, characterized in that the end face of the specimen is polished by bringing the specimen into contact with a polishing plate.