In some large public places, such as subways, airports, and urban roads, we often see rows of stone with concave-convex stripes on the surface, which are neatly and uniformly paved in these public places. These plates are blind stones, which are installed on blind roads to facilitate the travel of the blind. The utility model is paved with bricks with special shapes, and the prompt is achieved by using the foot feeling function of the blind and the feeling aid principle of the blind path brick.
When it comes to blind stone, it can be said that stone is the most ideal material for making blind stone. Blind stone processed by the stone can be used for decoration both outdoors and indoors. Although stone is an ideal material for making blind stone, the polishing of blind stone is a headache. If the blind stone is polished by manual water adding mill, a skilled polisher can polish up to 20 ~ 30 300 blind stones of 300 * 300, which is far from meeting the supply needs of the project.
In recent years, China’s municipal road construction requires a large number of blind stones, and large-scale subway construction requires a large number of blind stones because the restriction of low grinding and polishing efficiency of blind stones restricts the more extensive use of blind stones, and stone enterprises dare not undertake too many processing of blind stones, because blind stones have a small size, low added value, low output, and low profit, Undertaking too much has a great impact on the output and profits of other products of the enterprise. So is there any good process to polish the blind stone? In this article, we will introduce the grinding method of blind stone.
1. Grinding brush
The grinding brush has a round and horseshoe shape. The horseshoe shape is preferred for grinding and polishing blind stones.
Types of grinding brushes: nylon brush, steel wire brush, and mixed brush.
Grinding brush shape: round, horseshoe, and Fichte
The material of the grinding brush is made of special nylon and silicon carbide materials. The nylon brush is made of high-quality silicon carbide and special nylon material, which is firmly fixed on a brush base. It is mainly an antique grinding brush for marble. The steel wire brush is made of stainless steel wire or low-carbon steel wire. It is mainly used for brushing and grinding hard stones such as granite. A hybrid brush is a grinding brush made of special nylon and stainless steel wire. The grinding brushes are 36#, 60#, 120#, 240#, 320#, 500#, 600#, 800#, 1000#.
Frankfurt type is used in the walking mill, grinding and polishing production line, ground refurbishing machine, and other equipment in stone industrial production; Round is used for small manual polishing machine, ground refurbishing machine, and other equipment; Fickett type is used on the equipment of fully automatic continuous polishing line.
2. Grinding plate
A grinding disc is a tool for installing a horseshoe grinding brush. The diameter of the grinding disc is generally ￠ 250, and 6 ~ 8 clamping slots are installed on it. The clamping slots are installed in an “eight” shape to prevent the grinding brush from being thrown out under the action of centrifugal force during the operation of the grinding disc. Figure 4 shows the grinding disc, also known as chuck;
3. Hand Mill
The walking mill is the main equipment for grinding and polishing blind stone. It is cheap and does not occupy the site. It is best to select the pressure bar type walking mill, which is convenient to apply pressure to the product to be polished during grinding and polishing.
4. Watermill
The water mill is an auxiliary tool for grinding and polishing blind stone, and can also be used for grinding and polishing blind stone. When grinding and polishing the blind stone with a hand-held grinder, some corner positions are difficult to polish well. If necessary, use a water grinder to properly deal with local poor polishing, to make the grinding and polishing effect better.
5. Grinding and polishing process of blind stone
Installation of grinding brush → coarse brush → fine brush → protection
(1) Install the grinding brush
Install the horseshoe grinding brush on the grinding disc.
(2) Rough brush
Use 36#, 60#, 120# to roughen the blind stone. Rough grinding is the most critical step in polishing the blind stone, to eliminate the traces caused by the surface modeling of the blind stone. The pressure shall be well controlled during rough brushing. When the pressure is too high, it is easy to brush the shape of the blind stone and deform it; When the pressure is too small, the traces on the surface of the blind stone cannot be brushed off, affecting the surface polishing quality.
(3) Fine brush
Fine grind the blind stone with 320#, 500#, 600# grinding brushes.
(4) Polishing
Grind and polish the blind stone with more than 1000 # grinding brushes. The view of grinding and polishing stone with the grinding brush can only be ground to matte. The grinding brush can be ground to a high gloss, but the luster polished by the grinding brush is different from that polished by abrasive. It has the antique effect, as shown in Figure 10. The author thinks that this effect is more lasting and simple than the luster of the traditional board.
(5) Protection
When the blind stone is installed on the ground, its surface shall be protected with a better protective agent to make the blind stone waterproof and antifouling in the process of use.
If you have more good suggestions to share about the grinding of blind stone, you are welcome to email me at sales@sntstone.com.
