JPH10175146A - Grinding method and device for concrete block - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a grinding automatizing device by moving a concrete block with the surface to be ground vertical, and bringing the surface to be ground of the concrete block into contact with the outer peripheral surface of a grinding roller, the outer peripheral surface of which is vertical to be ground. SOLUTION: A chain conveyer 9 has a chain which is endlessly wrapped and rotated, and a hook is erected from a plate provided on the outside thereof. When a block 1 on a first block receiving table 5 is fed onto the chain conveyer 9 by a pusher 6, the hook is engaged with a web of the block 1 to transport the block by the chain conveyer 9. One side surface of the transported block 1 is ground by a grinder 15. The grinder 15 includes a grinding roller 16 arranged in such a manner that the outer peripheral surface is vertical, and the grinding roller 16 is brought into contact with one side surface of the block 1 to grind the side surface. At this time, the block 1 is pressed to the grinding roller 16 side by a pressing roller 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grinding method and a grinding apparatus for grinding a surface of a concrete block such as a hollow block, an interlocking block for pavement, and a concrete plate to expose a part of the aggregate.

[0002]

2. Description of the Related Art In architecture, hollow concrete blocks are used for partition walls and fences of houses, and small concrete blocks such as interlocking blocks and concrete plates are used as paving materials. Generally, these blocks are made by mixing coloring raw materials as necessary with the main raw materials consisting of cement, crushed stone aggregate, and sand, adding water, kneading the concrete into a formwork, and using a vibration compaction machine. It is compacted and immediately molded out of the mold by an immediate demolding method. This intermediate product is stacked on a pallet in two or three stages and cured until the cement hardens. Usually, concrete products made in this way are shipped as they are and used as construction materials.

[0003] The surface of this concrete product has a fine particle cement during the production, so that the appearance of the cement becomes a single color of the cement or the pigment, and there is no mixture of crushed stone aggregate or sand. 0.5-1m
By grinding about m, the shape of the crushed stone aggregate and sand inside is clearly prominent, and comes to have a natural stone-like pattern.

[0004] Conventionally, in the manufacture of polishing decorative blocks, each block is polished one by one at a factory with a wet polishing machine equipped with a diamond blade while sprinkling water on the polishing surface, or by a dry polishing machine using sandpaper.

A grinder for polishing hard concrete products generates high frictional heat. Therefore, dry polishing with sandpaper shortens the life of the abrasive and does not allow long-term continuous operation. To prevent this heat generation, in the stone industry,
Wet polishers, which polish while sprinkling water on the polished surface, were often used.However, this requires a large amount of cost for treating large amounts of wastewater, so the overall polishing cost is high and it is suitable for polishing small concrete block products. Was not appropriate.

In recent years, a diamond electrodeposition roller has been developed, and a long-time continuous grinding operation can be performed even by a dry method, so that the polishing cost is considerably lower than that of the dry polishing using a sandpaper.

In general, these grinding machines employ a top surface grinding method in which a grinding surface of a workpiece is directed upward and a rotating grinding blade is pressed vertically from above to perform grinding.

[0008]

A small concrete block is required to have a size of 2 mm to a specified size of a product in a manufacturing process.
Since an error of up to 3 mm is involved, when a plurality of blocks are arranged and the upper surface is simultaneously ground by a grinder, the blocks are cut from a thick object, resulting in excessive or insufficient cutting. Grinding the surface of a product having a dimensional error in each block at a depth of 0.5 to 1 mm not only complicates the blade position control itself but also greatly affects productivity.

According to the present invention, all steps from forming to grinding of the block are changed in the vertical state of the block, and a conversion equipment for changing the placement of the block is not used. It is an object of the present invention to provide a method and an apparatus for grinding a concrete block that can be used. The present invention also provides a concrete block grinding method and a concrete block grinding method which can continuously grind a ground surface at a constant depth even in a block having a thickness variation, and does not require a complicated control device. The purpose is to: Further, the present invention is a dry grinding machine,
To provide a concrete block grinding method and apparatus capable of continuously performing grinding work, eliminating the need for polishing wastewater treatment such as a wet polishing machine, and greatly reducing costs as compared with conventional block polishing. Aim.

[0010]

SUMMARY OF THE INVENTION A method of grinding a concrete block according to the present invention is a grinding method of shaving a surface of a concrete block to expose a part of an aggregate, while making a ground surface of the concrete block vertical. The concrete block is moved, and the surface to be ground of the concrete block is brought into contact with the outer peripheral surface of a grinding roller whose outer peripheral surface is vertical to grind the surface to be ground.

A concrete block grinding apparatus according to the present invention is provided with a transfer device for transferring a concrete block with a ground surface thereof being vertical, and a transfer device arranged near a transfer path of the transfer device, wherein an outer peripheral surface of the concrete block is vertical. And a grinding machine having a grinding roller.

In this grinding device, the conveying device is composed of a chain conveyor. The chain conveyor has a plurality of chain wheels whose axes are horizontal, and a chain that is endlessly hung on the chain wheels to rotate endlessly. It is preferable to include a plate for placing a concrete block, and a hook for hooking the block on the plate, provided on the outer peripheral side of the rotation of the chain.

[0013] In this grinding apparatus, the grinding machine has a plurality of base rollers for guiding the concrete block arranged along the conveying path, and the base rollers sandwich the concrete with the grinding roller therebetween. It is arranged on both the upstream side and the downstream side in the block transport direction,
It is preferable that the peripheral edge portion of the grinding roller enters the conveyance path side from a common tangent connecting the outer peripheral surfaces of the base rollers on the conveyance path side.

In the grinding apparatus of the present invention, it is preferable that guide plates of concrete blocks are provided on both sides of the transport path.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a concrete block grinding method and a grinding apparatus according to an embodiment, FIG. 2 is a longitudinal sectional view of a connecting portion between a first block receiving table and a chain conveyor, and FIG. 3 shows a configuration of a grinding machine. FIG. 4 is a perspective view of the hollow block, and FIG. 5 is a perspective view showing the appearance of the hollow block.

As shown in FIG. 4, the hollow block 1 has a well-known structure in which a pair of side portions are connected by webs 2 and a hollow portion 3 is formed between the webs 2. As shown in FIG. 5, a plurality of the hollow blocks 1 are arranged on a pallet 4 per one stage, and are carried in a state of being superposed on a plurality of stages.

As shown in FIG. 1, the hollow block 1 is placed on the first block receiving base 5 and moved so that the side surface of the block 1 comes into contact with the stopper 7. The hollow block 1 in contact with the stopper 7 is sent out along the stopper 7 by the pusher 6 and is conveyed by the chain conveyor 9.

As shown in FIG. 2, the chain conveyor 9 has a chain 11 which is endlessly wound around a chain wheel 10 and rotates endlessly. In this embodiment, a plate 13
And a hook 14 stands from the plate 13. When the block 1 on the first block receiving table 5 is sent out onto the chain conveyor 9 by the pusher 6,
The block 1 rides on the plate 13, the hooks 14 engage the webs 2 of the block 1, and the block 1 is transported by the chain conveyor 9.

Note that guide plates 8 are provided upright on both sides of the conveying path of the chain conveyor 9.

One side of the block 1 conveyed by the chain conveyor 9 is ground by a grinder 15. The grinding machine 15 includes a grinding roller 16 disposed so that the outer peripheral surface is vertical, and further includes a base roller 17 on both the upstream side and the downstream side of the grinding roller 16 on the conveying path. These base rollers 17
Are also arranged such that the outer peripheral surface is in the vertical direction. The grinding roller 16 is arranged such that a part of the outer periphery of the chain conveyor 9 side slightly enters the chain conveyor 9 side from a common tangent to the outer peripheral surface of the base roller 17 on the chain conveyor 9 side.

A pressing roller 18 is arranged on the side opposite to the grinding roller 16 and the base roller 17. These pressing rollers 18 are also arranged so that their outer peripheral surfaces are vertical, and the pressing rollers 18 can be urged toward the grinding roller 16 by a hydraulic cylinder 19. Each press roller 18 is rotatably supported by a frame 20, and a rod 21 of a hydraulic cylinder 19 is connected to the frame 20.

Guide plates 22 are provided upright on both the left and right sides of the transport path downstream of the grinding machine 15. A second block receiver 23 is arranged at the end side of the chain conveyor 9, and the block 1 conveyed by the chain conveyor 9 is transferred onto the second block receiver 23 and is conveyed until it comes into contact with the stopper 24. Proceed in the direction of extension of the road.
The block 1 that has stopped in contact with the stopper 24 is sent out toward the center of the second block receiving base 23 by the pusher 25.

As clearly shown in FIG. 3, the grinding roller 1
6 contacts one side of the block 1 and grinds this side. At this time, the block 1 is pressed against the grinding roller 16 by the pressing roller 18. The block 1 moves to the right in FIG.

Although the present invention is not particularly limited, the shape of a block to be ground is, for example, a standard type.
390mm in width, 190mm in height, 100-190m in thickness
m, weight of about 6.5 to 16 kg. The guide plates 8 and 23 have a function of preventing the conveyed block 1 from meandering and falling. As is clear from FIG.
The distance between the guide plates 8 becomes narrower as it approaches the grinding machine 15, and the ground surface (side surface) of the block 1 is gradually approached to the grinding roller 16.

In the grinding machine 15, the grinding depth of the block 1 can be adjusted by adjusting the depth of the grinding roller 16 entering the chain conveyor 9 from the common tangent line of the plurality of base rollers 17. it can.
While the grinding roller 16 grinds the block 1, the block 1 is pressed against the grinding roller by a pressing roller 18 at a constant pressure. The pressing roller 18 is a steel roller whose outer peripheral surface is covered with an elastic material. Is preferred. With a pressing roller covered with such an elastic material, it is possible to buffer variations in the thickness of the block 1 and to always transmit a reaction force necessary for grinding to the block 1 by operating the hydraulic cylinder 19. Can be.

The block 1 that has been ground is removed from the hook 14 at the end of the chain wheel, knitted into the original square shape by the pusher 25, then put together by a loader (not shown), and loaded on a pallet.

The grinding roller 16 is preferably a diamond electrodeposition roller. Since this diamond electrodeposition roller is of a dry grinding type, it is possible to continuously perform a grinding operation, and does not require a polishing wastewater treatment such as a wet polishing machine. The cost can be significantly reduced as compared with polishing.

[0028]

As described above, according to the grinding method and apparatus of the present invention, all steps from the forming to the grinding of the block are shifted in the vertical state of the block. It is not necessary to use a conversion equipment for changing the grinding equipment, and the entire grinding equipment can be simplified. In addition, even if the thickness of the block varies, it is possible to continuously grind the surface to be ground at a constant depth, and a simple control device is sufficient.

[Brief description of the drawings]

FIG. 1 is a plan view showing a grinding method and apparatus according to an embodiment.

FIG. 2 is a vertical cross-sectional view of a block transfer portion between a block receiver and a chain conveyor in FIG. 1;

FIG. 3 is a perspective view showing a configuration of a grinding machine.

FIG. 4 is a perspective view of a block.

FIG. 5 is a perspective view showing a package of a hollow block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hollow block 2 Web 3 Hollow part 5 1st block receiving stand 6 Pusher 7 Stopper 8 Guide plate 9 Chain conveyor 10 Chain wheel 11 Chain 13 Plate 14 Hook 15 Grinder 16 Grinding roller 17 Base roller 18 Holding roller 19 Hydraulic cylinder 22 Guide Plate 23 Second block receiving stand 24 Stopper 25 Pusher

Claims (5)

[Claims] 1. Shaving the surface of a concrete block,
In the grinding method for exposing a part of the aggregate, the concrete block is moved while the ground surface of the concrete block is moved vertically, and the ground surface of the concrete block is ground on the outer circumferential surface of a grinding roller having a vertical outer circumferential surface. And grinding the surface to be ground by contacting the surfaces. 2. A grinder having a conveying device for conveying a concrete block with its surface to be ground being vertical, and a grinding roller disposed near a conveying path of the conveying device and having a vertical outer peripheral surface. A grinding device for a concrete block comprising: 3. The chain conveyor according to claim 2, wherein the conveyor comprises a chain conveyor, the chain conveyor having a plurality of chain wheels having a horizontal axis, and a chain that is endlessly rotated by the chain wheels endlessly. An apparatus for grinding a concrete block, comprising: a plate for placing a concrete block, which is provided on a rotation outer peripheral side of the chain; and a hook for hooking the block on the plate. 4. The grinding machine according to claim 2, wherein the grinding machine has a plurality of base rollers for guiding a concrete block arranged along the conveyance path, and the base roller sandwiches the grinding roller. Are arranged on both the upstream side and the downstream side in the concrete block conveying direction, and the peripheral edge of the grinding roller enters the conveying path side from a common tangent connecting the outer peripheral surfaces of the base rollers on the conveying path side. An apparatus for grinding a concrete block. 5. The concrete block grinding apparatus according to claim 2, wherein concrete block guide plates are provided on both sides of the conveyance path.