Preparation method of long-life wear-resistant grate bar

Abstract

The invention relates to a preparation method of a long-life wear-resistant grate bar, which comprises the following steps: step 1, a grate bar is used as a bar-shaped metal bar, the metal bar is made of common steel, and two ends of the bar-shaped metal bar are provided with sub-bayonets; (2) preparing a magnet block which has certain magnetism and adopts a metal alloy magnet and (3) attaching a protective layer made of a refractory material on the magnet with magnetism and protecting the magnet from being abraded by the sintered ore, arranging female bayonets at two ends of the refractory material, and arranging female bayonets at two ends of the refractory material. 4, combining the magnets with magnetism with the two ends of the strip-shaped metal bar screen ribs in the step 1 in a bayonet mode; according to the technical scheme, the problem of abrasion resistance of the sieve is solved, production efficiency is improved, the using amount of steel of the sieve is reduced, downtime for replacing the sieve is shortened, and use efficiency of equipment is improved.

Description

Technical Field

[0001] The present invention relates to a preparation method, and particularly to a preparation method for a long-life wear-resistant sieve bar, belonging to the technical field of wear-resistant materials. Background Art

[0002] When the sintered ore of an iron and steel company is transported to a blast furnace, it has to pass through a sieve to control the particle size. The sieve is composed of sieve bars, and the sieve bars are strip-shaped metal rods. The problem is that they are quickly worn out during use and generally need to be replaced once a month, which not only increases the production cost but also affects the work efficiency.

[0003] Chinese Patent Publication No. CN107299296A discloses a wear-resistant sieve mesh and its preparation method. The sieve mesh contains the following components by mass percentage: C: 1.321 - 1.381%; Si: 0.347 - 0.367%; Mn: 12.06 - 13.06%; P: 0.055 - 0.063%; S: 0.0056 - 0.00574%; Cr: 1.98 - 1.994%; Mo: 0.008 - 0.012%; Ni: 0.05 - 0.062%; Cu < 0.005%; Al < 0.003%; V: 0.141 - 0.143%; the balance is Fe. The specific steps are as follows: 1) mold making; 2) melting and mixing; 3) casting; 4) cooling; 5) demolding; 6) surface treatment. This invention has relatively high requirements for the sieve mesh material, and since there are a large number of sieve bars required on site, it will inevitably increase the cost and is not very suitable.

[0004] Chinese Patent Publication No. CN202066360U discloses a wear-resistant sieve roll. A 2 - 4 μm thick stainless steel wear-resistant layer is sprayed on the surface of the sieve roll, enabling the sieve roll to have the dual advantages of a ceramic roll and a stainless steel roll. Not only is the wear resistance of the sieve roll significantly improved, but it is also not easily damaged, thereby extending the service life of the sieve roll. This patent is applied to roll changing, which can relatively reduce the number of roll changes, reduce the accident rate of the roll sieve, improve the output and quality of pellets, and ensure the stable operation of pellet production. However, this material is not applicable to the scenario of this patent. Therefore, there is an urgent need for a new solution to solve the above technical problems. Summary of the Invention

[0005] The present invention precisely aims at the problems existing in the prior art and provides a preparation method for a long-life wear-resistant sieve bar. This technical solution solves the problem of the wear resistance of the sieve, improves production efficiency, reduces the usage amount of sieve mesh steel, reduces the downtime for changing the sieve mesh, and improves the equipment utilization efficiency.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows. A preparation method for a long-life wear-resistant sieve bar, the method comprising the following steps:

[0007] Step 1: Use a sieve bar as a strip-shaped metal rod. The metal rod is made of ordinary steel, and sub-fasteners are provided at both ends of the strip-shaped metal rod.

[0008] Step 2: Prepare a magnet block that is the same size as the strip-shaped metal rod in Step 1. The magnet block has a certain magnetism and uses a metal alloy magnet.

[0009] Step 3: Attach a protective layer made of refractory material to the magnet with magnetism. The protective layer protects the magnet from being worn by sintered ore. Female fasteners are provided at both ends of the refractory material.

[0010] Step 4: Combine the magnet with magnetism and the sieve bar of the strip-shaped metal rod in Step 1 at both ends by means of fasteners.

[0011] Among them, the metal rod in Step 1 is made of Q235 material.

[0012] Among them, the magnet block in Step 2 uses an alnico magnet.

[0013] Among them, the refractory material in Step 3 is made of corundum mullite and has a thickness of 3-5 mm.

[0014] Compared with the prior art, the present invention has the following advantages: 1. After a certain amount of sintered ore is adsorbed by the magnetic layer sieve bar in this technical solution, since the sintered ore on the outer layer does not have magnetism and will not adsorb more sintered ore, when in use, it is the sintered ore that wears the sintered ore, and the magnetic layer sieve bar is not worn at all, thus achieving the purpose of long life, and the service life of the sieve bar is extended by 5 times or more compared with the traditional sieve bar; 2. Since this technical solution reduces the replacement amount and saves the maintenance time, the time for production is relatively increased, thus improving the production efficiency of the company; 3. After the service life of the magnetic layer sieve bar of the present invention is extended, its usage amount is greatly reduced, and the procurement cost is reduced to 50% compared with the original. Specific Embodiments

[0015] To deepen the understanding of the present invention, the present invention will be described in detail below in conjunction with embodiments.

[0016] Embodiment 1: A preparation method for a long-life wear-resistant sieve bar, the method comprising the following steps:

[0017] Step 1: Use a sieve bar as a strip-shaped metal rod. The metal rod is made of ordinary steel, and sub-fasteners are provided at both ends of the strip-shaped metal rod.

[0018] Step 2: Prepare a magnet block that is the same size as the strip-shaped metal rod in Step 1. The magnet block has a certain magnetism and uses a metal alloy magnet.

[0019] Step 3: Attach a protective layer made of refractory material to the magnet with magnetism. The protective layer protects the magnet from wear by sintered ore. Female bayonets are provided at both ends of the refractory material.

[0020] Step 4: Combine the magnet with magnetism and the bar-shaped metal bar sieve ribs in Step 1 at both ends by bayonet method.

[0021] Among them, the metal bar in Step 1 is made of Q235 material.

[0022] Among them, the magnet block in Step 2 is an alnico magnet.

[0023] Among them, the refractory material in Step 3 is made of corundum-mullite and has a thickness of 3-5 mm.

[0024] The sieve of this invention patent has two processes. The sieve is composed of sieve ribs and a magnetic layer.

[0025] The sieve ribs are bar-shaped metal bars.

[0026] The magnetic layer is a magnet with magnetism. A protective layer made of refractory material is attached to the magnet. The protective layer protects the magnet from wear by sintered ore.

[0027] The refractory material is made of corundum-mullite amorphous material, which is pre-cast and has a thickness of 3-5 mm;

[0028] These two layers are combined by bayonet method.

[0029] Usage method: In the experimental stage of this scheme, when the sintered ore transported by the steel company is transported to the blast furnace and passes through the wear-resistant sieve bars of this sieve, the sintered ore that does not meet the particle size will fall through the sieve and become sintered return ore. Because the sieve ribs with a magnetic layer of this invention will wrap part of the sintered ore with magnetism on the surface of the sieve ribs of this invention, the sieve ribs will not be worn by the next batch of falling sintered ore. When the sieve ribs with a magnetic layer adsorb a certain amount of sintered ore, because the sintered ore on the outer layer does not have magnetism and will not adsorb more sintered ore, so during use, the sintered ore wears the sintered ore. The sintered ore on the inner layer contacts the refractory material of the magnet protective layer and does not wear the magnet either. Therefore, the sieve ribs with a magnetic layer are not worn at all, thus achieving the purpose of long life.

[0030] Usage method: During the experimental stage, when the sinter is transported to the blast furnace and passes through this sieve, the particle size is controlled. Since the magnetic layer wraps the magnetic sinter around the sieve bars, the sieve bars are not resistant to wear. Five batches of test samples were tested on-site. The service life of the original material was 1 month and needed to be replaced. The service lives of these five batches of test samples were 12 months, 13 months, 13 months, 16 months, and 15 months respectively. The extended life far exceeded 5 times. At the same time, the production efficiency was improved. It is preliminarily estimated that if this solution is widely used, it is expected to increase the molten iron output by nearly 10,000 tons per year and save the procurement cost of sieve bars by nearly 2 million yuan. Furthermore, it achieves the goal of increasing the service life of the existing sieve while reducing the company's procurement cost and improving the company's production efficiency.

[0031] It should be noted that the above embodiments are not used to limit the protection scope of the present invention. Any equivalent transformation or substitution made on the basis of the above technical solutions falls within the protection scope of the claims of the present invention.

Claims

1. A preparation method of a long-life wear-resistant sieve bar, characterized in that, the method comprises the following steps: Step 1: The sieve rib is a strip-shaped metal rod made of ordinary steel. There are male bayonets at both ends of the strip-shaped metal rod. Step 2: Prepare a magnet block of the same size as the strip-shaped metal rod in Step 1. The magnet block has a certain magnetism and uses a metal alloy magnet. Step 3: Attach a protective layer made of refractory material to the magnetic magnet. The protective layer protects the magnet from wear by sintered ore. There are female bayonets at both ends of the refractory material. Step 4: Combine the magnetic magnet with the strip-shaped metal rod sieve ribs at both ends in a bayonet manner.

2. The preparation method of the long-life wear-resistant sieve bar according to claim 1, characterized in that, the metal rod in Step 1 is made of Q235 material.

3. The preparation method of the long-life wear-resistant sieve bar according to claim 2, characterized in that, the magnet block in Step 2 is made of alnico magnet.

4. The preparation method of the long-life wear-resistant sieve bar according to claim 3, characterized in that, the refractory material in Step 3 is made of corundum mullite and has a thickness of 3-5 mm.