JPH04329105A - Exposure finishing device of surface aggregate of concrete block - Google Patents

Abstract

PURPOSE:To enable reductions in the costs of equipment and maintenance and continuous automation, in an exposure finishing device of surface aggregate of a concrete block to the surface of which retarder treatment is performed. CONSTITUTION:A brushing device 1 provided with a rotary brush 11 and water feed path and a washing device 2 provided with a high-pressure water injection nozzle 21 are arranged respectively on an input side and outlet side, on a conveyor 3 conveying a cement concrete block 30.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a device for finishing aggregate such as seed stone mixed in a cement concrete block so that it is exposed on the surface. A retardant treatment is applied to the surface of an unhardened block formed by vibratory press molding to delay the cement hardening reaction on the surface, and after the cement other than the surface hardens, the unhardened cement mixture on the surface is removed and used as aggregate. This relates to a device that exposes and finishes.

0002

BACKGROUND OF THE INVENTION Conventionally, uncured concrete mixture on the surface of blocks has been removed and cleaned by manual or electric wet brushing using wire brushes, synthetic resin brushes, animal or vegetable fiber brushes. In addition to this wet brushing, the unhardened cement mixture has also been removed by treating the block surface with an inorganic acid such as hydrochloric acid or by applying a high-pressure water jet treatment.

0003

[Problem to be solved by the invention] Wet brushing treatment is greatly affected by the material and shape of the brush, and the effectiveness varies depending on the degree of contact between the block surface and the brush tip.
There was a problem that the brush was not effective as it caused a lot of damage. Inorganic acid treatment has health and safety problems such as the generation of harmful gases and the scattering of cleaning fluids. There is always a part of the surface of a delayed-treated block very close to the surface where the retardation effect is small, but if you try to completely wash away that part with high-pressure water jet treatment, it will be difficult to wash away other parts where the retardation effect is sufficient. The problem was that the water pressure and volume were excessive, resulting in a lot of waste and being extremely uneconomical.

An object of the present invention is to solve the above-mentioned problems and to provide a concrete block surface aggregate exposure finishing device that is low cost, stable in quality, and easy to automate.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the means adopted by the present invention is to provide a brushing device on the inlet side of a conveying device such as a conveyor, and a cleaning device on the outlet side.
The brushing device consists of a rotary tube that can be rotated and has a water supply channel inside, a rotary disk attached to the lower end of the rotary tube, an annular brush attached to the lower surface of the rotary disk, and a space provided on the lower surface of the rotary disk. A high-pressure water pipe that connects the cleaning device to a high-pressure water source, a high-pressure water head that extends horizontally from the high-pressure water pipe, and nozzles that are installed at intervals on the high-pressure water head. It's what I did.

[0006]

[Operation] A cement concrete block whose surface cement hardening speed is retarded by a retarder has an unhardened surface of the cement mixture. This uncured surface is placed on a device such as a conveyor that conveys the material on the same plane at a constant speed. On the inlet side of the conveying device, the brushing device supplies a certain amount of water while rotating a synthetic resin brush containing annular abrasive grains, which has bristles on one side of a rotating disc, at a relatively slow circumferential speed so as to come into contact with the surface of the block. Wash away the cement mixture from the very surface layer of the delayed cement treatment. Due to variations in drying conditions during the curing period, there are some areas on the surface of the block where the retardation effect is small, but brushing washes away thin areas very close to the surface layer regardless of the retardation effect, but high-pressure water has a retardation effect. It is not possible to easily wash away areas with a small amount of This brushing cleaning uses a combination of contact with the extremely thin part of the block, relatively slow circumferential speed, and a synthetic resin brush containing abrasive grains.
Brush consumption is extremely low.

A disk-shaped centrifugal plate with a smaller diameter than the inner diameter of the brush, which is concentrically planted with bristles on one side of the rotating circular base, is installed parallel to the disk while maintaining a certain gap, so that the water from the water supply channel at the center of the rotating shaft is Almost all of the water supplied is distributed directly to the brushes due to the centrifugal force that accompanies the rotation. As a result, effective brushing can be achieved with a smaller amount of water. Immediately after this brushing process, the thin part of the concrete block that is very close to the surface of the concrete block has been washed away. Immediately after this process, a cleaning device that sprays high-pressure water washes away all the unhardened cement mixture that has not been washed away, exposing the aggregate. The quality of the finish is stable.

[0008] High-pressure water jet cleaning is effective when the jet angle is 45 to 70° with respect to the machined surface that exposes the aggregate of the block. Since the cleaning power is inversely proportional to the spray distance from the tip of the spray nozzle to the block, multiple nozzles are installed on a high-pressure head to ensure a fixed spray distance and block cleaning width. If the above devices are controlled in conjunction with each other, it will become an economical and highly productive automation device for exposed aggregate finishing.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus of the present invention will be explained based on the embodiments shown in the drawings. As shown in FIG. 1, the apparatus of the present invention includes a brushing device 1 equipped with a rotating brush 11, a cleaning device 2 equipped with a high-pressure water head 20, and a concrete block 30 that is conveyed at a constant speed on the same plane. It consists of a conveyance device 3 such as a conveyor. concrete block 30
is conveyed by a conveyor 3 running in the direction of the arrow, and first subjected to a wet brushing process by a brush 11 of a brushing device 1, so that the unwashed surface 31 becomes a brush surface 32.
Changes to Next, the brush surface 32 becomes a finished surface 33 by receiving high-pressure water jet treatment from the high-pressure water head 20 of the cleaning device 2 .

FIG. 2 is a side view of the brushing device 1, and FIG.
is a bottom view of the brushing device, in which a polyamide fiber brush 11 containing abrasive grains with a length of 80 mm has an outer diameter of 800 mm and an inner diameter of 7 on the lower surface of a rotating disk 10 with a diameter of 830 mm.
It is arranged in a hollow cylindrical shape with a diameter of 00 mm. The tip of the rotary tube 12 is fixed through the center of the rotary disk 10. A centrifugal plate 1 with a diameter of 500 mm is placed 5 mm away from the bottom surface of the rotating disk 10.
Fix 4 coaxially. Although not shown, the brush 11 is driven to rotate at 60 rpm via an electric motor, and the rotary tube 12 is connected to a water supply source via a rotary valve.

FIG. 4 is a front view of the cleaning device 2, FIG. 5 is a side view of the same device, and FIG. 6 is a plan view of the same device. Washing water is sent from a high-pressure water pump with a discharge pressure of 30 kgf/cm2 and a discharge water volume of 45 L/min to the high-pressure water pipe 22, and is then sent to the high-pressure water head 2.
The water is ejected as jet water 23 from the high-pressure water nozzle 21 of 0. As shown in FIG. 5, the jet water is ejected at an angle of 60 degrees to the brush surface 32 of the concrete block 30 in the vertical plane, washing away the cement mixture on the unhardened portion of the block surface.

As shown in FIG. 6, by attaching four flat nozzles 21 per block width of 60 cm to a horizontally extending high-pressure water head 20, the entire block width can be uniformly cleaned. In FIG. 1, the conveyor 3 travels in the direction of the arrow at a speed of 2 m/min. When a concrete block 30 treated with a retardant is placed at the entrance with the treated side facing up, the unwashed surface 31 is first subjected to wet brushing by the brushing device 1. The entire supply of water passes through the water supply channel 13 of the rotary tube 12 and reaches the centrifugal plate 14, where it is evenly supplied to the brush 11 through the gap 15 by centrifugal force, so that effective brushing can be performed with a small amount of water. Since the brush 11 contacts a very thin portion of the block surface and rotates at a relatively slow circumferential speed, the amount of brush wear is small. By this brushing, the surface of the concrete block becomes a brush surface 32 in which a portion very close to the surface layer is washed away regardless of the delay effect. This brushed surface 32 is subsequently subjected to a high-pressure water jet treatment by the cleaning device 2, which results in a finished surface 33 from which the uncured cement mixture has been washed away. The uncured cement mixture can be easily removed by high-pressure water jetting.
High-pressure injection equipment can be used with relatively low water pressures and low discharge volumes. The finished surface 33 has a beautiful appearance with seed stones embossed on the surface.

[0013]

Effects of the Invention As described above, the device of the present invention uses a wet brush treatment to wash away a thin part near the surface of a cement concrete block that has been treated with a retardant, regardless of the effect of the retardant, and then uses a high-pressure water jet treatment to wash away the thin part near the surface of the cement concrete block. By rinsing out the hardened cement mixture, we only take advantage of the strengths of each treatment, resulting in much longer brush life compared to traditional wet brushing treatments alone, and compared to high-pressure water jet treatments alone. Since the pressure of high-pressure water is low and the amount of water is small, it has the excellent effect of significantly reducing equipment costs and maintenance costs.

Furthermore, since the apparatus of the present invention has a brushing device and a cleaning device disposed on the concrete block conveying device, it is possible to continuously automate the finishing of exposed aggregate on the surface of the concrete block.

[Brief explanation of drawings]

FIG. 1 is a side view schematically showing an apparatus according to an embodiment of the present invention;

FIG. 2 is a side view of the brushing device;

[Figure 3] is a bottom view of the brushing device;

FIG. 4 is a front view of the cleaning device;

FIG. 5 is a side view of the cleaning device;

FIG. 6 is a plan view of the cleaning device;

[Explanation of symbols]

1: Brushing device 2: Cleaning device 3: Conveyor 10: Rotating disk 12: Rotating tube 13: Water supply channel 14: Centrifugal plate 20: High pressure water head 21: Nozzle 22: High pressure water pipe 30: Cement concrete block 31: Not washed 32: Brush surface 33: Finished surface

Claims (1)

[Claims] 1. A conveyance device (3) for moving a concrete block (30) at a constant speed; a brushing device (1) disposed on the entrance side of the conveyance device for brushing the concrete block; and a cleaning device (2) disposed on the exit side of the conveying device in order to perform cleaning treatment on the concrete blocks with high-pressure water, the brushing device being rotatable and having a water supply channel (13) inside. A rotating tube (12), a rotating disk (10) attached to the lower end of the rotating tube, and an annular brush (11) attached to the lower surface of the rotating disk at a predetermined interval. The cleaning device includes a centrifugal plate (14) mounted to face the opening of the rotary tube, and the cleaning device includes a high-pressure water pipe (22) connected to a high-pressure water source and a high-pressure water head (20) extending horizontally from the high-pressure water pipe. and,
Nozzles (
21) A concrete block surface aggregate exposure finishing device comprising: