JPH044199Y2 - - 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 a static value on the top surface of a polishing plate that supports a specimen such as concrete or rock horizontally and rotates at a low speed in a constant direction, and the weight of the specimen causes the friction between the specimen and the polishing plate. Contact pressure was obtained.

As a result, not only the required polishing time is long, but also the polished surface of the specimen cannot be kept strictly perpendicular or flat with respect to the center line of the specimen.

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 surface to be polished was immediately before polishing. 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, the abrasive equipment mentioned above is very noisy because it uses diamond sand, and in the above equipment and vibrating equipment, the abrasive often wears down the parts with low hardness, leaving only the hard parts on the surface. It had drawbacks such as an uneven surface.

Moreover, the handling of these devices required a considerable degree of skill, was expensive, and was mechanically complicated, resulting in a large 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 pivoted on a horizontal axis, rotated at high speed, and repeatedly oscillated manually at a predetermined angle, and the specimen is moved horizontally. It is characterized in that it can be moved.

The embodiment shown in the drawings will be described in detail below. A support 20 with a horizontal stand 1 fixed to its upper end is erected on a movable frame 19, and two swing frames 4 ₁ are mounted on the horizontal stand 1. , 4 ₂ on the swing shaft 3
A shaft 5 with a polishing plate 6 fixed at a position facing the tip surface of the specimen 16 such as concrete or rock is pivotally attached to the upper end of both the swing frames 4 ₁ and 4 ₂ . In this way, the polishing body a provided on the plate surface is rotated in contact with the surface to be polished of the specimen 16, and furthermore, the polishing body a provided on the plate surface is rotated in contact with the surface to be polished of the specimen 16, and furthermore, the polishing body a is placed on the upper end of the swing frames 4 ₁ and 4 ₂ straddling both sides of the manual handle 10. An electric motor 14 is attached to the lower end of the swing frame ₄₁ in an axial direction parallel to the shaft 5, and a belt is adjusted between the pulley 9 on the output shaft of the electric motor 14 and the pulley 7 on the shaft 5. 8 is suspended, and the shaft 5 is configured to rotate at high speed, thereby forming a driving section A.

Further, a dovetail-fitted feed bar 11 is installed on the upper surface of the horizontal table 1 near one end, and the feed bar 11 is operated by a handle 18 of a feed screw 12 installed horizontally in the center, and the feed bar 11 is moved through a worm gear. A specimen 16 such as concrete or rock is placed on the V-shaped specimen holder 13 fixed on the feed table 11 so as to move forward or backward. The upper surface of the specimen 16 is pressurized by the restraining cam 17 of the restraining position adjustment column 15 provided, and the specimen 16 is fixed to the holder 13, thereby configuring the specimen feeding mechanism B.

In the above, the restraint position adjustment column 15 is provided on the side surface of the holder 13, but as an exception, the
It may also be installed directly on the top surface of 1.

Incidentally, in the above-mentioned apparatus, dust generated by polishing concrete is sucked through a vacuum hose 21 and a dust collector 22, thereby constantly keeping 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 16 of the specified standard (JIS) was placed in the holder 13 with the surface to be polished.
The holder 13 is slightly protruded from the inner end of the holder 13.
Place it on top and tighten it with the restraining cam 17. That is, after holding the end surface of the specimen 16 in a state slightly protruding from the holder 13 and not in contact with the polishing body a of the polishing plate 6, the restraining cam 1
7, and by stepping on the foot switch 23, the electric motor 14 is started, and the abrasive plate 6 at the tip of the shaft 5 is rotated at high speed in a predetermined direction via the adjustment band 8.

Therefore, when the manual handle 10 connected to the upper ends of the swing frames 4 ₁ and 4 ₂ is manually rocked about the swing shaft ₃ at a constant amplitude (angle b), the polishing plate 6 The center O ₂ of will constantly change its position with respect to the specimen 16.

In this state, the specimen 16 is moved gradually forward (in the direction of the arrow) by rotating the handle 18 to move the feed bar 11 forward (in the direction of the arrow), and by just slightly feeding the specimen 16 while bringing its tip into light contact with the abrasive body a. The end face is polished in a short time.

Next, when the polishing is completed, the specimen 16 is moved backward by reversing the handle 18, and the restraining cam 17
It is released from the holder 13 by loosening the .

In this way, the surface to be polished of the specimen 16 can be finished completely smooth 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 finished smooth in a short time. In addition, the specimen 16 can be finished while maintaining its perpendicularity to the center line with high accuracy.

When the sizes (outer diameters) of the specimens are different, the restraining cam 17 is moved on the position adjustment column 15 for adjustment, and then the restraining cam 17 is operated to fix the specimen 16.

As described above, the device of the present invention has an extremely simple structure, uses only one electric motor, is inexpensive, and is also light in weight.

In addition, 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, resulting in a polished finished surface with high flatness instead of a medium-height curved surface as in conventional methods. Moreover, the perpendicularity of the specimen to the cylindrical axis is excellent, and because the polishing plate 6 is rotated and oscillated, even if there is a slight irregularity in the flatness of the polishing body a (diamond grinding wheel). The rocking process results in even polishing, which improves flatness and squareness even more 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...Abrasive plate, ₄₁ , ₄₂ ...Swing frame, 13...Specimen holder, 14...Electric motor, 16...Specimen.

Claims (1)

[Scope of utility model registration request] A swinging frame 4 ₁ with a swinging handle 10 set at the top,
4 ₂ is pivotally mounted on a horizontal table 1 so that it can freely swing on a rocking shaft, and a polishing plate 6 for polishing the end face of a specimen such as concrete or rock is pivotally attached to the upper end of the rocking frame. Then, the rotating shaft of the polishing plate 6 and the electric motor 14 installed at the bottom of the swing frame are appropriately linked, and the specimen holder 13 that holds the specimen on the horizontal table is moved to the polishing surface of the polishing plate. The end face of the specimen is polished by bringing the specimen into contact with the polishing plate while manually swinging the polishing plate at a predetermined angle. Specimen edge polishing device.