Roller protection ring and its assembly method

Abstract

To provide a roller protection ring allowing assembling and removing work to a roller outer peripheral surface with a small number of persons being a simple and inexpensive structure, and an assembling method thereof.SOLUTION: A roller protection ring 1 is attached to a roller R for loading a conveyor belt and protects the roller R, and is composed of two semi-circular ring members 2A, 2B comprising member bodies 3A, 3B covering roughly a half of the roller R, tongue piece parts 4A, 4B extending from one side parts 3AA, 3BA of the member bodies 3A, 3B, and recessed groove parts 5A, 5B formed by recessing from other side parts 3AB, 3BB of the member bodies 3A, 3B. The tongue piece parts 4A, 4B of the semi-circular ring members 2A, 2B and the other side parts 3AB, 3BB of the member bodies 3A, 3B hold the roller R, to thereby assemble the roller protection ring 1 as a roughly cylindrical body S.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a roller protection ring that is mounted on the outer peripheral surface of a roller on which a conveyor belt is placed and rolls to protect the roller, and a method for assembling the same.

Background Art

[0002] Generally, belt conveyors are widely used for conveying objects to be conveyed such as iron ore, coke, cement, earth and sand, powdered food materials, and feed. A general-purpose belt conveyor K is shown in FIG. 12. In this belt conveyor K, an endless conveyor belt B is placed on carrier rollers 16A and 16B of a carrier roller group D in the forward path, and the object to be conveyed is placed on its loading surface. The conveyor belt B on the return path from which the object to be conveyed has been unloaded is placed with its loading surface facing downward on a rolling return roller R and circulates. In this belt conveyor K, a gantry 11 is horizontally spanned between pedestal columns 10 and 10 erected on the floor, and columns 15 and 15 and intermediate columns 17 and 17 are erected on the gantry 11. Carrier rollers 16A and 16B are rotatably supported between the columns 15 and the intermediate columns 17 to form a carrier roller group D. In the return roller R disposed below the carrier roller group D, as shown enlarged within a circle P in FIG. 12, return brackets 13 and 13 are respectively suspended from upper chord frames 12 and 12 fixed to the upper portions of the pedestal columns 10 and 10. Both ends of the support shaft AX of the return roller R are supported and fixed on the ends of the return brackets 13 and 13. The support shaft AX is rotatably supported by bearings 14 and 14 installed at both ends of the cylinder of the cylindrical return roller R (see FIG. 11).

[0003] In the above-described belt conveyor K, as shown in FIG. 11, since the loading surface B1 of the conveyor belt B on the return path where the object to be conveyed is unloaded faces downward, the powder particles Q of the object to be conveyed adhering to the loading surface B1 come into contact with the outer peripheral surface RA of the return roller R, generating wear marks U on the outer peripheral surface RA and shortening the roller life. Due to such wear, there is a risk that rainwater may penetrate between the return roller R and the conveyor belt B during rainy weather, causing the belt to snake. Therefore, not only the return roller R itself but also all components such as the support shaft AX and the bearing 14 had to be scrapped.

[0004] When the return roller R reaches the end of its life due to such wear, as shown in FIG. 12, it is removed from the return brackets 13, 13 and replaced with a new roller. This roller replacement work involves lifting the conveyor belt B and inserting a receiving plate Y between it and the return roller R. One worker N crawls under the return roller R and uses a jack V placed on the floor stand Z to lift the receiving plate Y and the conveyor belt B from the return roller R. In this state, two workers N lift the support shafts AX, AX slightly from both sides and take them out. Incidentally, when the conveyor belt B is several hundred meters long or more, a considerable number of return rollers R, R, R,... have to be replaced. For example, a conveyor belt B for conveying ore with a width of 1350 mm and a thickness of 18 mm has a weight of about 25 kg / m, and the above-described roller replacement work was extremely harsh. Also, the storage and inventory management of a large number of replacement return rollers R are very troublesome.

[0005] Therefore, a roller protection ring as described in Patent Document 1 below is disclosed. This roller protection ring is composed of a semi-cylindrical mounting member made of steel material attached to the outer peripheral surface of the return roller, and a semi-cylindrical elastic member made of polyurethane adhered to the outer peripheral surface of this mounting member. The semi-circular arc member is composed of two such parts. In this roller protection ring, with the two mounting members positioned and applied to the outer peripheral surface of the return roller, the two outer elastic members are made into a cylindrical state with their arc end faces facing each other by a tightening member, and in this state, the two mounting members are welded and fixed to the outer peripheral surface of the return roller. Then, the tightening member is removed and it is used as a return roller with a roller protection ring. With such a configuration, it is stated that the conveyor belt on the return path is received by the elastic member of the roller protection ring so as not to be directly placed on the return roller, thereby suppressing wear and other adverse effects of the return roller.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0007] However, in the roller protection ring disclosed in Patent Document 1 described above, a large number of working steps such as using a tightening member with the two semi-circular arc members applied to the outer peripheral surface of the return roller, welding the mounting member to the return roller after tightening, and removing the tightening member after welding must be performed. And since the elastic member of the semi-circular arc member on which the conveyor belt is placed is made of synthetic resin, it is easily worn. However, since the welded mounting member cannot be removed, when the elastic member wears beyond a certain level, although it is a return roller with a roller protection ring, the entire return roller must be replaced in a short period in the same way as the conventional belt conveyor K described above, and various adverse effects for roller replacement will also be suffered similarly.

[0008] The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a roller protection ring and a method for assembling the same, which have a simple and inexpensive configuration, can be assembled to and removed from the outer peripheral surface of a roller by a small number of people, and can extend the life of the roller.

Means for Solving the Problems

[0009] In order to achieve the above object, a roller protection ring according to the present invention is a roller protection ring that is mounted on the outer peripheral surface of a cylindrical or columnar roller that rolls while placing a running conveyor belt and protects the roller, and includes a member body that covers substantially half of the outer peripheral surface of the roller, a tongue piece portion formed to extend in the circumferential direction from one side portion in the circumferential direction of the member body, and a concave groove portion formed to be recessed from the other side portion in the circumferential direction of the member body in a direction opposite to the extending direction of the tongue piece portion. The roller protection ring is configured to include two semi-circular arc ring members. One of the semi-circular arc ring members is mounted on the outer peripheral surface of the roller, and the tongue piece portion of the one semi-circular arc ring member and the other side portion of the member body sandwich the roller. The other semi-circular arc ring member is mounted on the outer peripheral surface of the roller so that the concave groove portion of the other semi-circular arc ring member fits into the Tongue piece part above, and the tongue piece portion of the other semi-circular arc ring member and the other side portion of the member body sandwich the roller, whereby the two semi-circular arc ring members are assembled into a substantially cylindrical shape.

[0010] Furthermore In the above configuration In addition , the roller is made of a cylindrical material, and the semi-circular arc ring member is also made of the same cylindrical material as the roller as a raw material.

[0011] And in each of the above-described configurations, the semi-circular arc ring member is made of Swedish steel.

[0012] Furthermore, in each of the above-described configurations, an adhesive is interposed between the outer peripheral surface of the roller and the semi-circular arc ring member.

[0013] Also, in each of the above configurations, the roller is a return roller on which an endless conveyor belt that circulates is placed and rolls.

[0014] And, a method for assembling a roller protection ring according to the present invention is an assembling method for assembling the roller protection ring according to any one of claims 1 to 5 to the outer peripheral surface of a roller, wherein the radius of curvature of the inner peripheral surface of the semi-circular arc ring member is set smaller than the radius of curvature of the outer peripheral surface of the roller, and a first deformation step of pushing one of the semi-circular arc ring members toward the axis of the roller to elastically deform the semi-circular arc ring member; a first roller clamping step of further pushing the semi-circular arc ring member elastically deformed in the first deformation step, bringing the member body of the semi-circular arc ring member into close contact with approximately half of the outer peripheral surface of the roller, and clamping the roller in the roller radius direction by the return elastic force between the tongue piece portion of one semi-circular arc ring member and the other side portion of the member body; a second deformation step of aligning the other semi-circular arc ring member so that the groove portion of the other semi-circular arc ring member fits into the tongue piece portion of one semi-circular arc ring member and pushing the other semi-circular arc ring member toward the axis of the roller to elastically deform the other semi-circular arc ring member; and a second roller clamping step of further pushing the other semi-circular arc ring member elastically deformed in the second deformation step, bringing the member body of the other semi-circular arc ring member into close contact with approximately the remaining half of the outer peripheral surface of the roller, clamping the roller in the roller radius direction by the return elastic force between the tongue piece portion of the other semi-circular arc ring member and the other side portion of the member body, and fitting the tongue piece portion of the other semi-circular arc ring member into the groove portion of one semi-circular arc ring member.

Advantages of the Invention

[0015] According to the roller protection ring of the present invention, there are provided two semi-circular arc ring members each comprising a member body covering substantially a half circumference of the outer peripheral surface of the roller, a tongue piece portion formed to extend in the circumferential direction from one side portion in the circumferential direction of the member body, and a concave groove portion formed to be recessed from the other side portion in the circumferential direction of the member body in a direction opposite to the extending direction of the tongue piece portion. When the Tongue piece part and the concave groove portions are fitted together to be assembled into a substantially cylindrical shape, the two semi-circular arc ring members sandwich the outer peripheral surface of the roller at a position exceeding half of its circumference with their respective Tongue piece part and the other side portion of the member body, so that it can be firmly fixed to the outer peripheral surface of the roller in a substantially cylindrical form. That is, since there is no need for a tightening member or the like for temporarily fixing the two semi-circular arc ring members, the number of parts is small, the configuration is simple, and the work is less. Also, since it is not welded to the outer peripheral surface of the roller, when the semi-circular arc ring member wears, only the worn semi-circular arc ring member needs to be removed and replaced with a hand tool or the like. And since each semi-circular arc ring member is small and lightweight, it is easy to carry around at the site, and even one person can easily assemble and disassemble it.

[0016] Further, if the roller is made of a cylindrical material and the semi-circular arc ring member is made of the same cylindrical material as the roller as a raw material, it can be manufactured simply and inexpensively with fewer part types.

[0017] And if the semi-circular arc ring member is made of Swedish steel, since the elastic force is overwhelmingly higher than that of general-purpose carbon steel materials, the tongue piece portion of the semi-circular arc ring member and the other side portion of the member body can sandwich the roller with a very high elastic force. As a result, it can be used for a longer period compared to a semi-circular arc ring member made of carbon steel or the like, and the life of the roller can be extended several times.

[0018] Incidentally, even with only the semi-circular ring member, the outer peripheral surface of the roller can be clamped and fixed in a practical state by clamping the tongue piece portion on the side portion and the other side portion of the member body. However, in the case where an adhesive is interposed between the outer peripheral surface of the roller and the semi-circular ring member, the two clamped semi-circular ring members can be fixed more firmly, and a longer service life of the semi-circular ring member and the roller can be achieved.

[0019] Further, when the present invention is applied to a return roller on which a circulating endless conveyor belt is placed and rolls, it is possible to prevent the powder particles of the conveyed object that have fallen from the placement surface of the conveyor belt in the circulating return path from being directly rubbed between the placement surface and the outer peripheral surface of the return roller, and prevent the wear of the return roller.

[0020] And according to the method for assembling the roller protection ring according to the present invention, since it includes a first deformation step, a first roller clamping step, a second deformation step, and a second roller clamping step, one semi-circular ring member clamps the roller in the roller radial direction in the first deformation step and the first roller clamping step, and the other semi-circular ring member clamps the roller in the roller radial direction in the second deformation step and the second roller clamping step. During the second roller clamping step, the tongue piece portion of the other semi-circular ring member fits into the concave groove portion of one semi-circular ring member, and the two semi-circular ring members are assembled into a substantially cylindrical shape. That is, by each step configured by simple operations, even a small number of people (for example, one person) can easily perform the assembly work or removal work on the roller.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples of embodying the present invention and do not limit the technical scope of the present invention. Here, FIG. 1 is an external view showing a state before assembling a roller protection ring according to an embodiment of the present invention, FIG. 2 is a view showing one semi-circular ring member of the roller protection ring, (a) is a perspective view, and (b) is a view taken along line A-A in (a). FIG. 3 is a view showing the other semi-circular ring member of the roller protection ring, (a) is a perspective view, and (b) is a view taken along line B-B in (a). However, the same components as those of the conventional belt conveyor shown in FIGS. 11 and 12 may be denoted by the same reference numerals and detailed description thereof may be omitted.

[0023] The roller protection ring 1 according to this embodiment is mounted on the outer peripheral surface of a roller on which a traveling conveyor belt is placed and rolls to protect the roller. The roller exemplified in this embodiment is a return roller R on which an endless conveyor belt B traveling in a loop is placed on the return path, and is formed in a cylindrical shape, for example. And as shown in FIGS. 1 to 3, the roller protection ring 1 is configured by combining two semi-circular ring members 2A and 2B.

[0024] One of the above-described semi-circular ring members 2A includes a member body 3A that covers approximately half of the outer peripheral surface RA of the return roller R, a tongue piece portion 4A that extends in the circumferential direction from one side portion 3AA in the circumferential direction of the member body 3A, and a concave groove portion 5A that is recessed from the other side portion 3AB in the circumferential direction of the member body 3A in a direction opposite to the extending direction of the tongue piece portion 4A. The other semi-circular ring member 2B of the above description includes a member body 3B that covers approximately the remaining half of the outer peripheral surface RA of the return roller R, a tongue piece portion 4B that extends in the circumferential direction from one side portion 3BA in the circumferential direction of the member body 3B, and a concave groove portion 5B that is recessed from the other side portion 3BB in the circumferential direction of the member body 3B in a direction opposite to the extending direction of the tongue piece portion 4B.

[0025] Incidentally, as shown in FIG. 4, the return roller R is composed of a cylindrical material M. The semi-circular arc ring members 2A and 2B are also made from the same cylindrical material M as the return roller R as raw material. This cylindrical material M uses, for example, a carbon steel pipe of STPG370 (nominal diameter 5B × nominal thickness Sch80) with an outer diameter DO (see FIG. 5) of 138.9 mm. Incidentally, before elastic deformation, the curvature radii r1 of the inner peripheral surfaces 3AC and 3BC of the semi-circular arc ring members 2A and 2B are set to be smaller than the curvature radius r2 (= outer diameter DO) of the outer peripheral surface RA of the return roller R. The curvature radii r1 of the inner peripheral surfaces 3AC and 3BC described above correspond to the inner diameter DI of the inner peripheral surface of the return roller R. These semi-circular arc ring members 2A and 2B are produced from the cylindrical material M by cutting and grinding. The symbol W in the figure indicates the waste generated during production.

[0026] The two semi-circular arc ring members 2A and 2B configured as described above are assembled to the return roller R by the method to be described below, as shown in FIGS. 5 and 6. Incidentally, in FIGS. 5, 2, and 3, the unit of the dimension values added to the dimension lines as numerical examples is all mm. The method of assembling from these two semi-circular arc ring members 2A and 2B to the roller protection ring 1, which is a substantially cylindrical cylindrical body S, is composed of a first deformation step, a first roller clamping step, a second deformation step, and a second roller clamping step, which will be described in detail later. Here, the description will be made from the state where a single operator N on the work cart has crawled under the return roller R of the belt conveyor K (see FIG. 6). The belt conveyor K has almost the same structure as the belt conveyor K shown in FIG. 12, except that the return roller R is covered with the roller protection ring 1 (cylindrical body S), so a detailed description will be omitted. This belt conveyor K is also configured to loop an endless conveyor belt B around drive rollers (not shown) arranged at both the front and rear ends.

[0027] First, in the first deformation step, one semi-circular arc ring member 2A is struck and pushed in by a hammer H toward the axis C of the return roller R (in the direction of arrow T in Fig. 5(a)). As a result, the entire semi-circular arc ring member 2A is expanded in diameter by elastic deformation. That is, the radius of curvature r1 of the inner peripheral surface 3AC of the semi-circular arc ring member 2A expands to the radius of curvature r2 of the outer peripheral surface RA of the return roller R. Then, in the first roller clamping step described above, the semi-circular arc ring member 2A elastically deformed in the first deformation step is further pushed in, and Tongue piece part the tip of 4A and the other side portion 3AB of the member body 3A exceed half the circumference of the outer peripheral surface RA of the return roller R, and the member body 3A is closely fitted to approximately half the circumference of the outer peripheral surface RA of the return roller R. At the same time, the tongue piece portion 4A of the semi-circular arc ring member 2A and the other side portion 3AB of the member body 3A clamp the return roller R in the roller radius direction (in the directions of arrows LA, LA in Fig. 5(a)) by the return elastic force of the semi-circular arc ring member 2A itself at a position exceeding half the circumference of the outer peripheral surface RA of the return roller R, and the semi-circular arc ring member 2A is firmly fixed. In this state, the return roller R is rotated by hand, and the semi-circular arc ring member 2A is moved between the outer peripheral surface RA of the return roller R and the loading surface B1 of the conveyor belt B.

[0028] In the subsequent second deformation step, the semi-circular arc ring member 2B is aligned so that the concave groove portion 5B of the semi-circular arc ring member 2B is fitted into the tongue piece portion 4A of the semi-circular arc ring member 2A at the position described above. Then, the semi-circular arc ring member 2B is struck and pushed in by a hammer H toward the axis C of the return roller R. As a result, the entire semi-circular arc ring member 2B is elastically deformed to expand the radius of curvature r1 of the inner peripheral surface 3BC in the same manner as that of the semi-circular arc ring member 2A. Then, in the second roller clamping step, the semi-circular arc ring member 2B elastically deformed in the second deformation step is further pushed in, and Tongue piece partThe tip of the 4B and the other side portion 3BB of the member body 3B exceed a semi - circumference of the outer peripheral surface RA of the return roller R, and the member body 3B is closely fitted to substantially the remaining semi - circumference of the outer peripheral surface RA of the return roller R. At the same time, the tongue piece portion 4B of the semi - arc ring member 3B and the other side portion 3BB of the member body 3B sandwich the return roller R in the roller radial direction (the directions of the arrows LB, LB in Fig. 5(a)) by the return elastic force of the semi - arc ring member 2B itself at a position exceeding a semi - circumference of the outer peripheral surface RA of the return roller R, and the semi - arc ring member 2B is firmly fixed. At this time, the tongue piece portion 4B of the semi - arc ring member 2B is fitted into the concave groove portion 5A of the semi - arc ring member 2A, and a cylindrical body S composed of the semi - arc ring member 2A and the semi - arc ring member 2B is formed. That is, through the above - mentioned respective steps, the two semi - arc ring members 2A, 2B are assembled to the outer peripheral surface RA of the return roller R as the roller protection ring 1 which is the cylindrical body S. In this example, two sets of the roller protection rings 1 are fitted to one return roller R. That is, by each step configured by simple operations, even one person can easily perform the work of assembling the roller protection ring 1 to the return roller R.

[0029] With respect to the roller protection rings 1, 1 fitted to the return roller R as described above, as shown in Fig. 7, the worker N performs the filling process of the caulking material J with the caulking gun G. As shown in Figs. 5(a), (b), (c), the filling locations in the semi - arc ring members 2A, 2B are the gaps between the one - side portions 3AA, 3BB and the other side portions 3AB, 3AA, Tongue piece part the gaps between the 4A, 4B and the concave groove portions 5A, 5B, and the gaps between the inner peripheral surfaces 3AC, 3BC and the outer peripheral surface RA of the return roller R. By filling the caulking material J in this way, the particulate matter Q from the conveyor belt B does not enter into the assembled roller protection ring 1, so that the internal corrosion of the roller protection ring 1 is suppressed, and the early detachment of the semi - arc ring members 2A, 2B from the return roller R can be prevented.

[0030] Also, as shown in FIG. 8, if a caulking material J (an example of an adhesive), such as a modified silicone resin, is pre-applied to the planned covering positions of the semi-circular ring members 2A and 2B on the outer peripheral surface RA of the return roller R, the caulking material J is interposed as an adhesive between the outer peripheral surface RA of the return roller R and the semi-circular ring members 2A and 2B. Incidentally, if, for example, an epoxy resin adhesive for bonding steel materials (another example of an adhesive) is used instead of the caulking material, it will be fixed more firmly. As a result, the semi-circular ring members 2A and 2B and the return roller R can be made to have an even longer service life. When removing the semi-circular ring members 2A and 2B from the return roller R, if the semi-circular ring members 2A and 2B and the return roller R are heated with a heater or the like and a solvent is poured between them to dissolve the adhesive, they can be easily removed.

[0031] As described above, according to the roller protection ring 1 of this embodiment, the two semi-circular ring members 2A and 2B are respectively Tongue piece part 4A, 4B and the other side portions 3AB, 3BB of the member main bodies 3A, 3B sandwich a position exceeding half the circumference of the outer peripheral surface RA of the return roller R. At the same time, the Tongue piece part 4A, 4B and the other side portions 3AB, 3BB of the member main bodies 3A, 3B are fitted together and assembled as a cylindrical body S. Thereby, the roller protection ring 1 can be firmly fixed to the outer peripheral surface RA of the return roller R in the form of the cylindrical body S.

[0032] That is, since there is no need for a fastening member or the like for fixing two semi-circular arc ring members as in the prior art, the number of parts is small and a simple configuration suffices. Further, since it is not welded to the outer peripheral surface RA of the return roller R, when the semi-circular arc ring members 2A and 2B are worn, only the worn semi-circular arc ring members 2A and 2B can be removed and replaced. And since the individual semi-circular arc ring members 2A and 2B are small and lightweight, it is easy to carry them around at the site, and even one person can easily assemble and disassemble them. Further, since the semi-circular arc ring members 2A and 2B are manufactured using the same cylindrical material M as the return roller R as a raw material, they can be manufactured simply and inexpensively with a small number of parts types.

[0033] And, due to this roller protection ring 1, the contact area between the powder and dust adhering to the conveyor belt B and the return roller R is reduced, so the amount of powder and dust falling onto the floor or the like is significantly reduced. Further, since there is almost no contact between the conveyor belt B and the return roller R, the meandering of the conveyor belt B caused by rainwater can be suppressed. And since a gap is formed between the conveyor belt B and the central portion of the return roller R, the wear of the return roller R is reduced, and the return roller R can be made to have a long service life. As a result, there is also an effect that the inventory quantity of spare return rollers R can be reduced, and inventory management becomes easier.

[0034] In addition, in the above-described embodiment, an example in which two pairs of roller protection rings 1 and 1 are mounted on one roller is shown, but the present invention is not limited thereto. For example, as shown in FIG. 9, four pairs of roller protection rings 1, 1, 1, and 1 may be mounted on one roller, or three pairs or five pairs or more of roller protection rings 1, 1, 1,... may be mounted.

[0035] Further, in the above, the return roller R is exemplified as the roller to which the present invention is applied, but as shown in FIG. 10, the roller protection ring 1 may be mounted on any one or all of the carrier rollers 16A and 16B constituting the carrier roller group D.

[0036] And in the above, an example was shown in which STPG steel pipes were used as the materials for the semi-circular ring members 2A and 2B. Instead of this, it is also possible to configure the semi-circular ring members with Swedish steel. This Swedish steel generally refers to steel materials obtained from Swedish domestic iron ore. However, for the Swedish steel used in the present invention, high elasticity and wear resistance are required. That is, it is desirable that the contents of phosphorus and sulfur, which make the steel brittle, are each 0.02% by weight or less and 0.01% by weight or less, respectively. As a result, a steel material with wear resistance and hardness more than three times higher than that of SS400 is provided. Also, it is desirable that the content of molybdenum is relatively high at 0.4% by weight or more, which provides a steel material with high elastic force (clamping force). According to the roller protection ring composed of the semi-circular ring members of this Swedish steel, the return elastic force for clamping the roller is several times higher than that of the one made of STPG, so it can be firmly fixed to the outer peripheral surface of the roller. As a result, the roller can be used with a lifespan more than three times that of the roller protection ring made of STPG.

[0037] Also, in the above, regarding the present invention Tongue piece part and as the concave groove portions, the concave groove portions 4A, 4B on one side portion and the concave groove portions 5A, 5B on the other side portion were exemplified. However, instead of these, as shown in parentheses in FIGS. 2(a) and 3(a), the reference numerals 5Aa, 5Aa, 5Ba, 5Ba on one side portion are used as the concave groove portions, and the reference numerals 4Aa, 4Aa, 4Ba, 4Ba on the other side portion are Tongue piece part used as Tongue piece part may be used as well.

[0038] Alternatively, in the above, a cylindrical roller composed of an STPG steel pipe was exemplified. However, instead of steel materials such as carbon steel, for example, a semi-circular ring member may be fabricated with 16 mm thick polyvinyl chloride. Even such a semi-circular ring member made of a hard synthetic resin can be fitted on the outer peripheral surface of the roller to provide roller protection.

[0039] Also, in the above, an example in which the present invention was applied to a cylindrical roller was shown. Instead of this, the present invention is also applicable to a columnar roller.

[0040] Furthermore, the present invention is not limited to the above-described embodiments. That is, it goes without saying that design changes within the scope not departing from the gist of the present invention, including various modifications and corrections that can be conceived by those having ordinary knowledge in the field of the present invention, are also included in the present invention.

Explanation of Reference Numerals

[0041] 1 Roller protection ring 2A, 2B Semi-circular arc ring members 3A, 3B Member main bodies 3AA, 3BA One side portions 3AB, 3BB Other side portions 3AC, 3BC Inner peripheral surfaces 4A, 4B, 4Aa, 4Ba Tongue pieces 5A, 5B, 5Aa, 5Ba Groove portions 16A Carrier roller (roller) B Conveyor belt B1 Placing surface C Axis J Caulking material K Belt conveyor LA, LB Arrows M Cylindrical material R Return roller (roller) RA Outer peripheral surface r1 Radius of curvature r2 Radius of curvature S Cylindrical body T Arrow

Claims

1. A roller protection ring that is mounted on the outer peripheral surface of a cylindrical or columnar roller that rolls while placing a running conveyor belt thereon to protect the roller, comprising two semi-circular arc ring members each including a member body covering substantially a half circumference of the outer peripheral surface of the roller, a tongue piece portion formed to extend in the circumferential direction from one side portion in the circumferential direction of the member body, and a concave groove portion formed to be recessed from the other side portion in the circumferential direction of the member body in a direction opposite to the extending direction of the tongue piece portion, wherein one of the semi-circular arc ring members is mounted on the outer peripheral surface of the roller, and the tongue piece portion of the one semi-circular arc ring member and the other side portion of the member body sandwich the roller, and the other semi-circular arc ring member is mounted on the outer peripheral surface of the roller such that the concave groove portion of the other semi-circular arc ring member fits into the tongue piece portion of the one semi-circular arc ring member, and the tongue piece portion of the other semi-circular arc ring member and the other side portion of the member body sandwich the roller, whereby the two semi-circular arc ring members are assembled in a substantially cylindrical shape, and the roller is made of a cylindrical material, and the semi-circular arc ring member is made of the same cylindrical material as the roller as a raw material. A roller protection ring characterized by this.

2. The roller protection ring according to claim 1, characterized in that the semi-circular arc ring member is made of Swedish steel.

3. The roller protection ring according to claim 1 or claim 2, characterized in that an adhesive is interposed between the outer peripheral surface of the roller and the semi-circular arc ring member.

4. The roller protection ring according to any one of claims 1 to 3, characterized in that the roller is a return roller that rolls while placing a circulating endless conveyor belt thereon.

5. A method of assembling the roller protection ring according to any one of claims 1 to 4 on the outer peripheral surface of the roller, wherein the radius of curvature of the inner peripheral surface of the semi-circular arc ring member is set to be smaller than the radius of curvature of the outer peripheral surface of the roller, a first deformation step of pushing one of the semi-circular arc ring members toward the axis of the roller to elastically deform the semi-circular arc ring member, The semi-circular arc ring member elastically deformed by the first deformation step is further pushed in so that the member body of the semi-circular arc ring member is brought into close contact with approximately a half circumference of the outer peripheral surface of the roller, and the tongue piece portion of the one semi-circular arc ring member and the other side portion of the member body sandwich the roller in the roller radial direction by the return elastic force, a first roller clamping step; The other semi-circular arc ring member is aligned so that the groove portion of the other semi-circular arc ring member is fitted into the tongue piece portion of the one semi-circular arc ring member, and the other semi-circular arc ring member is pushed toward the axis of the roller to elastically deform the other semi-circular arc ring member, a second deformation step; The other semi-circular arc ring member elastically deformed by the second deformation step is further pushed in so that the member body of the other semi-circular arc ring member is brought into close contact with approximately the remaining half circumference of the outer peripheral surface of the roller, and the tongue piece portion of the other semi-circular arc ring member and the other side portion of the member body sandwich the roller in the roller radial direction and the tongue piece portion of the other semi-circular arc ring member is fitted into the groove portion of the one semi-circular arc ring member, a second roller clamping step; A method for assembling a roller protection ring, characterized by comprising the above steps.

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