JPH01295752A - Polishing device for concrete test piece - Google Patents

Abstract

PURPOSE:To contrive the efficiency of polishing work by mounting a test piece onto a table to be pressed and positioned by a positioning mechanism and polishing one end surface of the test piece in a clamped condition by a polishing mechanism. CONSTITUTION:A table 18 can be swiveled by a swiveling cylinder 9 to a position of S1 to S3. When a test piece (c) from a supply conveyer 23 is mounted onto a bottom-cut V-shaped receiving plate 18e on the table 18 of the position S1, the test piece C is pressed by a positioning cylinder 29 and adapted to a reference plate on the table 18. Next retracting a piston rod 29a to be reset while moving the table 18, the test piece C is pressed to a positioning member 31 and positioned by adapting it to a detecting switch. The table 18 is swiveled to the position S2, and clamping the test piece C with a pressing stopper member 27 by a clamp cylinder 25, the test piece C polishes its point end surface C1 by a grinding wheel 34. The table 18 of the polishing completed test piece C is discharged in the position S3.

Description

[Detailed Description of the Invention] (Industrial Application Field 1) This invention is a method for automatically polishing the end face of a concrete specimen when preparing a concrete specimen to be subjected to a strength test of concrete materials in accordance with test standards. This invention relates to a polishing device for concrete specimens.

(Prior art) Conventionally, when creating a cylindrical concrete specimen whose length, outer diameter, end area, etc. meet test standards,
Fresh concrete is filled into a bottomed cylindrical body with a predetermined inner diameter and height, left to harden for about a day and night, and then mortar is poured onto the concrete molding that has shrunk as the fresh concrete hardens. A so-called capping process is performed in which a smooth plate such as a glass plate is placed on top of the mortar for about a day and night to harden the mortar, and then a concrete specimen is formed by hand, or the formed concrete specimen is Concrete specimens were created through a polishing operation in which the end faces of each concrete specimen were manually fed into a polishing machine and polished one by one based on the operator's experience and feeling.

(Problems to be Solved by the Invention) When creating a concrete specimen by the capping process described above, there is a problem that a large amount of time and space are required to form the mortar, which significantly reduces work efficiency. When polishing the end faces of concrete specimens one by one using a polishing machine, there was a problem in that not only the work efficiency deteriorated, but also a skilled technique was required for polishing.

It is an object of the present invention to solve the above-mentioned problems and to produce concrete specimens evenly and efficiently.

(Means for Solving the Problems) The present invention includes a table on which a concrete specimen for strength testing is placed, a positioning mechanism for pushing and positioning the concrete specimen on the table, and a positioning mechanism for positioning the concrete specimen on the table. The gist of this invention is a polishing device for concrete specimens, which includes a clamp mechanism that releasably clamps a specimen, and a polishing mechanism that polishes one end surface of the clamped concrete specimen.

(Function) The concrete specimen is pushed and positioned by the positioning mechanism, then clamped by the clamp mechanism, one end surface of the concrete specimen is polished in this state, and after polishing, the concrete specimen is released from the clamp mechanism. Each concrete specimen is automatically polished by repeating a series of operations.

(Effects of the Invention) Since the present invention is configured as described above, when polishing a concrete specimen, each concrete specimen can be accurately and automatically polished, and the polishing work of the concrete specimen can be made more efficient and labor-saving. It has the effect of leveling out the polished finish of each polished concrete specimen.

(Example) Next, one embodiment of the present invention will be described with reference to the drawings.

Concrete 1 to tip surface C of specimen C formed into a cylindrical shape specified by concrete strength test standards and having a rough tip surface C1 and a smooth proximal surface C2 formed on both end surfaces.
In the polishing equipment installed to polish 1 to meet test standards, a rectangular trapezoidal base 1 is installed slightly above the floor surface F, and each of the four corners of the base 1 is horizontally Wheels 2 are attached to each of the formed corner plates 1a, and the base 1 is moved toward and away from the floor F.
Support screws 3 for positioning on top are each screwed vertically.

A fixed stand 4 is erected on one side of the upper surface of the base 1, and a support shaft 5 supported horizontally via a support member 6 is installed slightly above the upper surface of the base 1.

A swinging member 7 installed on the base 1 adjacent to one side of the fixed stand 4 is supported so as to be swingable about the support shaft 5, and a pair of left and right support pieces 7a protrude from the lower end of the swinging member 7. , 7a, the support shaft 5 is inserted through them.

The tip of a piston rod 9a of a swing cylinder 9 is tiltably attached to one side of a fixed base 4 via a bracket 8 in order to control the swing member 7, and the tip of the piston rod 9a is connected to the swing member 7. The swinging member 7 can be converted into a forward leaning posture, an upright posture, and a backward leaning posture by respectively displacing it to the advancing end position, intermediate position, and retreating end position.

Bearing member 10 attached to the upper end of the outer surface of swing member 7
A screw shaft 11 is rotatably inserted into the support shaft 5 in parallel with the support shaft 5, and the screw shaft 11 is inserted into the bracket 12 attached to the outer surface of the swinging member 7 below the bearing member 10 in the forward and reverse directions. It is equipped for rotational drive and has two speed-up rotation and deceleration rotation.
A motor 13 whose drive is controlled by the rotational speed of the stage is attached,
A pulley 14 fitted to the motor shaft of this motor 13,
A belt 16 is hung around a pulley 15 fitted onto the shaft end of the screw shaft 11. A guide rail 17 having a rectangular cross section is provided at the upper end of the swinging member 7 so as to protrude in a direction parallel to the screw shaft 11 .

In a table 18 that is movably installed on the swinging member 7 in order to place the concrete specimen C in a horizontal position, a guide rail 1 is provided on the lower surface of a rectangular plate-shaped substrate 18a.
A pair of guide pieces 18b, 18b, each having a slide groove 19 recessed in the lower surface thereof, into which the table 18 is slidably inserted and guides the table 18 in the axial direction of the concrete specimen C, are provided protrudingly on the lower surface of the substrate 18a. is concrete specimen C
A threaded cylinder 18C into which the threaded shaft 11 is screwed is provided in order to move the threaded shaft 11 forward and backward in the axial direction. On the substrate 18a, there are a plurality of leg pieces 18d to 1 having approximately V-shaped notches in the upper part.
8d are arranged in parallel in the axial direction of the concrete specimen C. On each leg piece 18d, plates 18e to 18e are fixed to a suitable number of pairs of plates 18e to 18e, each of which is formed by a pair of inwardly downwardly inclined flat plate bodies that are opposed to each other in a substantially inverted C shape.
The plates 18e of each pair of receivers face each other so that their extended surfaces are perpendicular to each other. A concrete specimen C is attached to the inner surface of the outer surface of the leg piece 18d erected at the outer end of the substrate 18a.
A reference plate 18f, in which a reference surface 20 with which the proximal end face C2 of the 20 is brought into contact, is formed in a vertical planar shape is attached side by side and protrudes upward, and the outer surface of this reference plate 18f has a protruding piece 21 extending upward.
is installed protrudingly.

To set the concrete specimen C having a length shorter than the maximum specified length on the table 18 so that its tip surface C1 is located at the same position as the tip surface C1 of the concrete specimen C having the maximum specified length. spacer 22 provided in
is removably attached to the reference surface 20 of the reference plate 18f of the table 1 via the butterfly head bolt 39, and the receiver is attached to the plate 18e.
When the spacer 22 is attached to the table 18, the front end surface of the spacer 22 becomes the reference surface 20'' for abutting the proximal end surface C2 of the concrete specimen C. For example, the diameter is 150 m1 and the length is For a concrete specimen C with a maximum dimension of 300IIR, the support of the table 18 is placed on the plate 18e with the spacer 22 removed, and when polishing a concrete specimen C with a diameter of 100M and a length of 200M, the diameter is 1005m. A spacer 22 having a length of
It is placed on i.

On one side of the swinging direction of the swinging member 7, a carry-in conveyor 23, which is driven and controlled intermittently, is installed facing the table 18 in order to sequentially carry in the concrete specimens C.
On the other side of the swinging direction of the swinging member 7, there is a carry-out conveyor 2 whose drive is controlled to sequentially carry out the concrete specimens C.
4 is installed facing the table 1B. When the swing member 7 swings to the swing end on the carry-in conveyor 23 side, the table 18 moves in a circular arc to the carry-in station S1, and when the swing member 7 stands upright, it moves in a circular arc to the polishing station S2. When the swing member 7 swings to the swing end of the carry-out conveyor 20!1, it moves in an arc to the carry-out station S3.

A clamp cylinder 25 is attached to the vicinity of the center of the projecting piece 21 of the reference plate 18f of the table 18 so as to be able to swing upward.
The base end of the swinging lever 26, which is pivotally connected to the upper end of the protruding piece 21, can be seen at the tip of the bottle, and the tip of the swinging lever 26 shows the concrete supply on the table. The upper end of a holding member 27 which approaches and separates from the upper surface of the specimen C and releasably clamps the concrete specimen C between it and the plate 18e of the table 18 is visible. When the piston mid 25a of the clamp cylinder 25 moves forward, the holding member 27 moves downward and the concrete specimen C is clamped between the holding member 27 and the receiving plate 18e.
Further, when the piston mid 25a leaves work, the holding member 27 moves upward and the concrete specimen C is unclamped.

A positioning cylinder 29 is attached horizontally along the axial direction of the concrete specimen C on the table 18 to a support bracket 28 attached to the upper end surface of the fixed base 4 at a position facing the table 18 of the loading station S1. has been done. As the positioning cylinder 29, its piston mid 29a
A two-stage stroke cylinder is used in which the cylinder operates from the retiring end position to the A/loaf or A+B stroke. The center of a disc-shaped movable plate 30 is fastened to the tip of the piston mid 29a of the positioning cylinder 29, and the movable plate 30 is moved from the start position to the position A+B by the two-step stroke operation of the piston mid 29a. It is displaced to the position where the stroke has advanced. A pair of upper and lower guide rods 30a, 30a are attached to the upper and lower ends of the inner surface of the movable plate 3° in parallel with the piston rod F29a in a cantilevered manner, and are formed to protrude from the upper and lower ends of the support bracket 28. It is horizontally slidably inserted through the upper and lower guide pieces 28a, 28a. A shaft portion 30b is provided at the center of the outer surface of the movable plate 30 and protrudes toward the table 18 side, and the loading conveyor 2 is attached to the shaft portion 30b.
The concrete specimen C transferred from above 3 to the table 18 is pushed to a position where its base end surface C2 contacts the reference surface 20 (201), and in order to position the distal end surface C1 of the concrete specimen C, a disc-shaped The contact portion 31a and the boss portion 31
A positioning member 31 is fitted so as to be able to slide in the axial direction.
2, it is always biased toward the table 18 side. When the piston rod 29a of the positioning cylinder 29 moves through its full stroke, the positioning member 31 comes into contact with the tip surface C1 of the concrete specimen C on the table 18 and pushes the concrete specimen C in the axial direction. The base end surface C2 of the concrete specimen C is in contact with the reference surface 20 (20M), and the concrete specimen C is positioned prior to polishing.

The detection switch 40 is connected to the positioning member 31 in order to transmit a signal to change the rotational speed of the motor 13 from accelerated rotation to decelerated rotation and to change the rotational speed of the screw shaft 11 and the feed speed of the table 18 from fast feed speed to slow feed speed. It is attached to the movable plate 30 with a slight distance from the back surface.

The bearing attached to the upper end surface of the fixed base 4 at a position facing the table 18 of the polishing station S2 is attached to the member 48, which is a grindstone shaft installed horizontally along the axial direction of the concrete specimen C on the table 18. 33 is rotatably supported, and a disk-shaped grindstone 34 is attached to the tip of this grindstone shaft 33 in order to polish the tip surface C1 of the concrete specimen C. The grindstone shaft 33 has a driven pulley 35 fitted to its outer end.
and a drive pulley 36 that is rotatably driven by a motor (not shown) installed in the fixed base 4, and a belt 37 that is hung around the belt 37. The whetstone 34 is attached to the upper end surface of the fixed base 4 and has a cover 3 formed to surround the whetstone 34.
Covered by 8.

The concrete specimen C placed on the table 18 of the polishing station S2 and clamped by the holding member 27 is advanced at a rapid speed until slightly in front of the grindstone 34 by the rotation of the screw shaft 11, and then the tip surface C1 is The tip surface C1 of the concrete specimen C is moved at a slow feed speed together with the table 18 so that it is gradually polished by the grindstone 34, and the length of the concrete specimen C is in accordance with the test standard. Grinding wheel 34 so that it is perpendicular to the axis
Polished with

There is also a detection switch that transmits a detection signal when the concrete specimen C is transferred from the loading conveyor 23 onto the table 18 of the loading station S1, and a detection switch that transmits a detection signal when the positioning member 31 advances to the advancing end. The detection switch that transmits the signal and the piston rod of the clamp cylinder 25
-' 25 A detection switch that sends a detection signal when a moves to the moving end, and a table 18 that is connected to the guide rail 1.
7 and a detection switch that sends a detection signal when it advances to the forward end, and the piston rod 2 of the clamp cylinder 25.
Detection switches and the like that transmit a detection signal when 5a moves from the advancing end to the retracting end are arranged at appropriate positions.

Next, the operation and effects of the embodiment having the above configuration will be explained.

First, the concrete specimen C is rolled from the carry-in conveyor 23 and transferred onto the table 18 in a state in which the piston rod 9a of the swing cylinder 9 is withdrawn and the table 18 is displaced to the carry-in station S1. Concrete specimen C
When the concrete specimen C is transferred onto the table 18, the piston rod 29a of the positioning cylinder 29 moves through its full stroke in response to the signal from the detection switch, and the positioning member 31 moves the concrete specimen C so that its base end surface C2 is on the reference surface 20 (2ON). The concrete specimen C is pushed until it makes contact, and the concrete specimen C is positioned on the table 18 (FIG. 4 (a)).

(See (b)). In this state, the piston rod 25a of the clamp cylinder 25 moves in response to a signal from the detection switch, and the concrete specimen C on the table 18 is clamped. When the concrete specimen C is clamped, the piston rod 29a of the positioning cylinder 29 moves to the intermediate position in response to a signal from the detection switch, and the positioning member 31 moves forward from the start position to the standby position (see Fig. 4). (See C). Subsequently, the motor 13 is started, the motor 13 and the screw shaft 11 rotate at an increased speed, and the table 1
8 moves forward at rapid forward speed. The table 18 moves forward and the concrete specimen C on the table 18 comes into pressure contact with the positioning member 31 at the standby position, and the positioning member 31 is pushed by the concrete specimen C against the elastic force of the spring 32 (first (See Figure 4 (d)), concrete specimen C
When the positioning member 31 pushed back to the position where the contact of the detection switch 40 is switched, the detection switch 4
The motor 13 is switched to decelerated rotation by the switching signal 0, and the table 18 and the concrete specimen C on the table 18 move forward at a slow feed speed, while the piston rod 2
9a moves back to the moving end, and the positioning member 31 returns to the starting position (see FIG. 4(E)). In this state, the piston rod 9a of the swing cylinder 9 advances to the intermediate position, the swing member 7 stands upright, and the table 18 moves to the loading station S.
1 to the polishing station S2. At the polishing station S2, the concrete specimen C on the table 18 moves horizontally toward the grindstone 34 at a slow feed speed, and the tip surface C1 of the concrete specimen C is gradually polished by the grindstone 34. be done. When the table 18 moves to the advancing end and polishing of the tip C1 of the concrete specimen C is completed, the motor 13 is reversed by a signal from the detection switch, the table 18 returns to its original position, and the clamp cylinder 25 is turned off. The piston rod 25a retires and the clamp on the concrete specimen C is released. Furthermore, when the concrete specimen C is unclamped, the swing cylinder 9 is activated by a signal from the detection switch.
The piston rod 9a moves to the moving end and the table 18
moves in a circular arc to the unloading station S3, the polished concrete specimen C is transferred from the table 18 and transferred onto the unloading conveyor 24, and the above series of operations is repeated for each concrete specimen C.

Therefore, each operation such as carrying in, positioning, clamping, polishing, unclamping, and carrying out the concrete specimens C is performed accurately and smoothly, and the tip C1 of each concrete specimen C is automatically polished evenly, and the concrete This has the effect of streamlining and labor-saving the polishing work of the specimen C, increasing the polishing precision of the tip face C1 of the concrete specimen C, and equalizing the polished finish state of each polished concrete specimen C.

Also, the table 18 moves in an arc, and the multiple pairs of supports are moved to the plate 18.
Since e opens toward the carry-in conveyor 23 and the carry-out conveyor 24 at the carry-in station S1 and the carry-out stage S2, the concrete specimen C is transferred from the carry-in conveyor 23 to the table 18 and from the table top 18 to the carry-out conveyor 24, respectively. The concrete specimen C can be automatically transferred and converted into a hanging state, and the automatic loading and unloading operations of the concrete specimen C can be carried out smoothly.

Next, the other side of the loading and unloading structure for the concrete specimen C will be explained according to FIG. The chute 41 is installed in an inclined manner with a slight downward inclination toward the swinging member 7, and near the tip of the carry-in chute 41, the vicinity of one end is near the lower end surface of the concrete specimen C that has rolled toward this tip. A carry-in lever 42 is swingably supported by a cam 43 which is disposed opposite to the cam 43 and whose other end is attached to the swinging member 7, and each time the table 18 is displaced to the carry-in station S1, the carry-in lever 42 is pushed and swung by the cam 43, and the loading chute 41
Concrete 1 to specimen C at the tip of are transferred onto the table 18 one after another.

On the other hand, on the side of the unloading station S3, an unloading chute 44 for removably placing the concrete specimen C is installed with a slight upward inclination toward the swinging member 7, and this unloading chute 44 A carry-out lever 44 is swingably supported near the base end of the carry-out station S3, with one end opposed to the vicinity of the lower end surface of the concrete specimen C on the table 18 of the carry-out station S3. The vicinity of one end is disposed opposite to the unloading lever 44, and the vicinity of the other end is the swinging member 7.
A swinging lever 46 is provided opposite to a cam 47 attached to the cam 47, and the carrying out lever 45 is pushed by the cam 47 via the swinging lever 46 every time the table 18 is displaced to the carrying out station S3. It is configured to swing so that the concrete specimens C on the table 18 are sequentially transferred onto the carry-out chute 44.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view;
Figure 2 is a side view, Figure 3 is a front view, and Figures 4 (a), (b), (c), (d), and (e) sequentially show the positioning operation and polishing preparation operation of the concrete specimen. FIG. 5 is a schematic front view showing the other side of the concrete specimen loading and unloading mechanism. 18: Table 27: Holding member 31: Positioning member 34: Grindstone C: Concrete specimen C1: Tip surface

Claims (1)

[Claims] A table on which a concrete specimen for strength testing is placed; a positioning mechanism that pushes and positions the concrete specimen on the table; a clamp mechanism that releasably clamps the positioned concrete specimen; 1. A polishing device for a concrete specimen, comprising: a polishing mechanism for polishing one end surface of a concrete specimen.