JPH04110137U - Roller for roller mill - Google Patents

Abstract

(57) [Summary] [Purpose] To increase the surface pressure strength of the outer peripheral surface of the bearing housing into which the roller tire is fitted, thereby extending the durability life of the bearing housing. [Structure] A predetermined thickness of hardened cladding is provided on the outer circumferential surface of a bearing housing 5b that is supported via a bearing 5a on the swinging end side of the support shaft 4 that is supported by the frame 2 so as to be swingable around the horizontal axis. The hardfacing layer h receives the load transmitted through the roller tire 5c due to the pressure of the crushing roller 5 against the crushing table 1, thereby preventing deformation of the outer circumferential surface of the bearing housing 5b. To prevent.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to the improvement of rollers for roller mills, and more specifically, the invention relates to the improvement of rollers for roller mills. Regarding roller mill rollers with improved surface pressure strength on the outer circumferential surface of the bearing housing. It is something to do.

0002

[Conventional technology]

Pulverizes raw materials to be crushed such as rocks, slag, clinker, coal, gypsum, and cement raw materials. A pulverizer is used for this purpose, and among pulverizers there is, for example, a roller mill. As shown in Fig. 5, which is an explanatory diagram of the main parts, such a roller mill has a vertical axis. A grinding table 1 rotated around the center and pressed against the top surface of this grinding table 1. A crushing roller rotates with the grinding table 1 to crush the raw material to be crushed, which is supplied onto the crushing table 1. - La 5.

0003 The details of the crushing roller 5 are as follows: The crushing roller 5 is provided on the pedestal 2 that supports the crushing table 1. The support shaft 4 is supported by a bracket 3 that is swingable around the axis of the horizontal shaft 3a. The support shaft 4 is supported in the direction of the rotating shaft via a bearing 5a on the anti-swing support side. A bearing housing 5b having a clearance groove 5d in the center of the outer periphery of the bearing housing 5b is rotatably supported. The roller tire 5c is externally fitted onto the roller tire 5c.

0004 In addition, the roller tire 5c mentioned above is available in one-piece type and split-type type. As shown in the figure, the bolts are attached to the bearing housing 5b. Both end surfaces are pinched by a clamp 6 attached by mechanical means such as By this, it is fixed to the bearing housing 5b.

[0005] By the way, the bearing housing 5b is generally made of a cast material with lower hardness than the material of the roller tire 5c. Although it is manufactured using iron or cast steel, the roller tire 5c, which is a consumable item, has high hardness. For example, materials such as high chromium or Ni-Hard cast iron are required. It is used.

[0006] Furthermore, as disclosed in Japanese Patent Application Laid-open No. 61-159279, the outer surface High C-high Cr cast iron hardened overlay metal is applied overlay welding to areas that are not subject to severe wear. High C-high Cr cast iron hardened metal is used as a matrix for areas that are subject to severe wear. The carbide of NbC, TiC or VC is separated into unmelted particles with good wear resistance. By welding the dispersed hardened overlay metal, the raw material to be crushed can be compressed and crushed. There are also roller tires that have improved abrasion resistance in the parts that wear.

[0007]

[Problem that the idea aims to solve]

As long as it operates within the capacity range based on the strength of each part that makes up the crushing roller. There is no problem, but for example, when grinding high hardness raw materials or the amount of crushed raw materials When increasing the amount, it is necessary to press the crushing roller more strongly against the crushing table.

[0008] The crushing roller roller disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 61-159279 - In La Tire, hardened overlay metal is certainly overlay welded, so the raw material to be crushed is The parts that are squeezed and crushed have excellent wear resistance.

[0009] However, the surface hardness of the material of the bearing housing into which the roller tire is fitted There was a problem with the degree of vibration, and when the pressure of the crushing rollers against the crushing table was increased, Since roller tires are harder than bearing housings, The surface of this bearing housing is deformed by the reaction force transmitted through the bearing housing.

0010 If the surface of the bearing housing is deformed in this way, the roller tire may not be installed properly. The roller tires may come off while driving, and the bearing housing may become damaged. may become unusable.

[0011] As mentioned above, roller tires are consumable items, but bearing housings are usually The bearing housing can be reused as it is typically used for over 10 years and is not a consumable item. If the roller mill becomes inoperable, repair costs for the roller mill will increase significantly, and the operation will be stopped for a long period of time. This will result in a decrease in the operating rate due to the stoppage.

0012 In other words, even if the running costs associated with roller tires are reduced, bearing There will be an increase in maintenance costs due to the inability to reuse the housing, and the overall From a financial point of view, it cannot necessarily be said to be economical.

[0013] If so, the bearing housing should be made of a highly hard material, such as the same material as the roller tire. The above-mentioned defects can be prevented if the product is manufactured using materials, but from an economic standpoint, it is expensive. The reality is that expensive, high-quality materials are not used.

[0014] Therefore, the present invention uses the same materials as conventional bearing housings and can withstand high loads. The object of the present invention is to provide a roller for a roller mill having a roller mill.

[0015]

[Means to solve the problem]

This invention was made in view of the above-mentioned circumstances, and therefore The configuration of roller mill rollers is such that the support shaft is supported so that it can freely swing in the vertical direction. A bearing housing is rotatably supported on the support side via a bearing, and the bearing housing The powder is rolled on the upper surface of a grinding table which is fitted on the outside and rotated around a vertical axis. For roller mills with roller tires that crush raw materials supplied to a crushing table In the roller, a hardened build-up layer of a predetermined thickness is formed on the outer periphery of the bearing housing. It is characterized by becoming.

[0016]

[Effect]

By the way, the permissible value when subjected to repeated compressive loads (side swing) is, for example, Ishibashi It is also described in ``Prevention of Metal Fatigue and Fracture'' published by Yokendo, which became the authoritative book. In general, it is given by the allowable surface pressure value of the material and depends on the tensile strength or hardness of the material. is known.

[0017] Therefore, according to the roller for a roller mill according to the present invention, the outer periphery of the bearing housing Since we have formed a hardfacing layer with a predetermined thickness, this hardfacing layer will protect the bearing housing. The surface pressure strength of the outer periphery has been improved, and the durability of the bearing housing against repeated compressive loads has been improved. improves.

[0018]

【Example】

An embodiment of the present invention is explained by explaining the structure of the main parts of a roller mill having an integrated crushing roller. Figure 1 and a partially omitted structural explanatory diagram of a bearing housing with a hardfacing layer formed on the outer periphery With reference to Figures 2, 3 and 4 of The same reference numerals are used to explain the following.

[0019] FIG. 1 relates to the first embodiment, and as in the conventional case, the rotation is made around the vertical axis. The grinding table 1 is pressed against the top surface of the grinding table 1 and is rolled. and a crushing roller 5 for crushing the raw material to be crushed supplied onto the crushing table 1. It has become.

[0020] The crushing roller 5 is installed on a pedestal 2 that supports the crushing table 1. Supported by a support shaft 4 supported by a bracket 3 so as to be able to swing freely around the horizontal axis A single layer with a thickness of 5 m is placed on the outer periphery of the support shaft 4 on the anti-swing support side via a bearing 5a. A cone-shaped bearing housing 5b formed with a hardfacing layer h of m is rotatably supported. In addition, a roller tire 5c is fitted onto the bearing housing 5b. It has become a reality.

[0021] As can be well understood from the above description of the configuration, the crushing roller according to this embodiment The bearing housing 5b has a hardened build-up layer h formed on its outer periphery, and the bearing The configuration is exactly the same as the conventional one except that the housing 5b is cone-shaped.

[0022] In the past, the surface of the bearing housing 5b was deformed due to the increase in load, resulting in the deformation shown in the figure. As a result of the roller tire 5c moving in the direction of the arrow, that is, to the left in the figure, the material to be crushed is When the material is crushed, the roller tire 5c rattles and the surface of the bearing housing 5b is damaged. In addition, the rattling may further accelerate wear on the surface of the bearing housing 5b. There is a concern about the durability of the bearing housing 5b since this may cause problems.

[0023] However, in this embodiment, the surface of the bearing housing 5b is As a result of the improved surface pressure strength, the bearing housing 5b remains stable even when the same load as above is applied. As a result of no deformation, the roller tire 5c does not move.

[0024] By the way, the bearing housing 5b on which the hardfacing layer h is formed is different from the bearing housing 5b. It can be manufactured at a lower cost than when manufactured from the same material as the roller tire 5c, and especially There were few economic disadvantages.

[0025] The thickness of the hardfacing layer h was set to 5 mm, and the reason for this is that the thickness of the hardfacing layer h is less than 5 mm, the base material of the bearing housing 5b is not very hard. As this deforms, cracks occur in the hardfacing layer h, which strengthens the bearing housing 5b. This is because there is a risk that the goal of improving performance will not be achieved.

[0026] Figure 2 is a partially omitted structural diagram of a bearing housing with a hardfacing layer formed on the outer periphery. Although the embodiment according to the second embodiment is shown, its shape is similar to that of the conventional one explained in FIG. It has the same configuration as that of the bearing housing 5b, and has an escape groove 5d circumferentially in the middle of the bearing housing 5b in the direction of the rotation axis. At the same time, on the outer periphery of the part excluding this relief groove 5d, a plurality of two layers with a thickness of 20 mm are provided. A headband-shaped partially hardened cladding layer h is formed. Therefore, this embodiment has the same effect as the bearing housing 5b according to the first embodiment.

[0027] Figure 3 is a partially omitted configuration explanatory diagram of a bearing housing with a hardfacing layer formed on the outer periphery. An example according to the third example is shown, but its shape is the same as that of the second example above. Therefore, a higher load is applied to one of the parts except for relief groove 5d, which is based on the operation history. A two-layer hardfacing layer h with a thickness of 20 mm is formed on the entire outer periphery of the side. Therefore, this embodiment has the same effect as the bearing housing 5b according to the first embodiment.

[0028] Fig. 4 is a partially omitted configuration explanatory diagram of a bearing housing with a hardfacing layer formed on the outer periphery. An example according to the fourth example is shown, but its shape is the same as that of the second example above. There is a two-layer hardfacing layer with a thickness of 20 mm on the entire outer periphery of the part excluding the relief groove 5d. A hardfacing ring 5e having a shape h formed thereon is externally fitted by shrink fitting. Therefore, this embodiment has the same effect as the bearing housing 5b according to the first embodiment.

[0029] In this way, a hardened build-up layer of a predetermined thickness is formed on the outer peripheral surface of the bearing housing 5b. This makes it possible to significantly improve the durability due to the increased deformation resistance of the bearing housing 5b. Not only that, but also when crushing highly hard raw materials that could not be crushed conventionally. It can be applied to cases such as increasing the amount of crushed raw materials to be crushed. It can also contribute to a significant improvement in strength.

[0030]

[Effect of the idea]

As detailed above, according to the roller mill according to the present invention, the bearing housing A hardfacing layer was formed around the outer periphery of the ring. Therefore, this hardfacing layer improves the surface pressure strength on the outer periphery of the bearing housing. As a result, the surface of the bearing housing does not change even when a load that would conventionally cause deformation is applied. Since the roller mill loses its shape, it is extremely effective in reducing repair costs and improving operating rates of roller mills. You can expect great effects.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the main parts of a roller mill having an integrated crushing roller according to a first embodiment of the present invention.

FIG. 2 is a partially omitted structural explanatory diagram of a bearing housing in which a hardfacing layer is formed on the outer periphery according to a second embodiment of the present invention.

FIG. 3 is a partially omitted structural explanatory diagram of a bearing housing in which a hardfacing layer is formed on the outer periphery according to a third embodiment of the present invention.

FIG. 4 is a partially omitted structural explanatory diagram of a bearing housing in which a hardfacing layer is formed on the outer periphery according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of the main part configuration of a roller mill according to a conventional example.

[Explanation of symbols]

1... Grinding table, 2... Frame, 3... Bracket, 4... Support shaft, 5... Grinding roller, 5a... Bearing, 5b... Bearing housing, 5c... Roller tire, 5d... Relief groove, 5e... Hardening Overlay ring, 6...clamp, h...hardened overlay layer.

Claims (1)

[Scope of utility model registration request] Claim 1: A bearing housing is rotatably supported via a bearing on the anti-swiveling support side of a support shaft that is swingably supported in the vertical direction, and is externally fitted on the bearing housing, and is mounted around a vertical axis. In the roller mill roller, the roller has a roller tire that rolls on the upper surface of a grinding table that is rotated to grind the raw material to be ground that is supplied to the grinding table. A roller for a roller mill, characterized in that a hardfacing layer of a predetermined thickness is formed on the outer periphery of the roller.