sleeve

Abstract

To provide a sleeve capable of performing mounting work to a roller more easily than before and being surely fixed to the roller.SOLUTION: A sleeve 10 is provided with a sleeve body 11 having a through hole 12 through which a roller is inserted, and satisfies the following equation (1) when the outer diameter dimension of the roller is OD [mm], and the inner diameter dimension, which is the diameter dimension of the through hole 12 before the roller is inserted into the through hole 12 of the sleeve body 11, is ID [mm]. -1.0≤{(OD-ID) / OD}×100≤1.0 ...(1).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a sleeve. [Background technology]

[0002] In a conventional belt conveyor, a cylindrical rubber or polyurethane sleeve is fitted onto the roller to prevent the endless belt stretched over the roller from becoming biased during operation (see, for example, Patent Document 1). As shown in Patent Document 1, the diameter of the sleeve's through-hole is smaller than the outer diameter of the roller, making it difficult for an operator to fit the sleeve onto the roller with bare hands. Therefore, it was not possible to fit the sleeve onto the roller without using a cylindrical attachment jig such as that shown in Patent Document 2. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-172495 [Patent Document 2] Japanese Patent Publication No. 2022-25701 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when attaching the sleeve to the roller, it is necessary to perform an installation operation of placing the sleeve on the cylindrical body attachment jig, and an attachment operation of attaching the cylindrical body attachment jig to the roller, etc. In this case, although the sleeve can be reliably fixed to the roller, there is a problem in that the attachment operation of attaching the sleeve to the roller cannot be easily performed.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a sleeve that can be attached to a roller more easily than before and can be reliably fixed to the roller. [Means for solving the problem]

[0006] The sleeve of the present invention is a cylindrical sleeve that is fitted onto a roller for a belt conveyor and fixed to the outer surface of the roller, and has a sleeve body having a through hole through which the roller is inserted, and when the outer diameter dimension of the roller is OD [mm] and the inner diameter dimension, which is the diameter dimension of the through hole before the roller is inserted into the through hole of the sleeve body, is ID [mm], the sleeve satisfies the following formula (1). -1.0≦{(OD-ID) / OD}×100≦1.0 (1) [Effects of the Invention]

[0007] According to the present invention, the sleeve can be fitted onto the roller with bare hands without using a conventional cylindrical body fitting jig, making the fitting easier than ever before. Furthermore, the sleeve can be fitted onto the roller with bare hands, and the sleeve can be reliably fixed to the roller without slipping off the roller. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a top view showing the configuration of the belt conveyor according to the embodiment. [Figure 2] FIG. 2 is a perspective view showing the configuration of a roller provided with a sleeve according to the present embodiment. [Figure 3] FIG. 2 is a side view illustrating a configuration of a roller according to the embodiment. [Figure 4] This is a front view showing the front configuration of the sleeve when viewed from a direction perpendicular to the axial direction x, and a side view showing the side configuration of the sleeve when viewed from a direction along the axial direction x. [Figure 5] 4 is a cross-sectional view showing a cross-sectional configuration when the sleeve according to the embodiment is fitted onto the roller. FIG. [Figure 6] FIG. 10 is a top view showing the configuration of a belt conveyor according to another embodiment. [Figure 7]FIG. 10 is a cross-sectional view taken along the axial direction x of a sleeve according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below. In the following description, the same components as those already described will be denoted by the same reference numerals and the description thereof will be omitted.

[0010] [1] Configuration of a belt conveyor using the sleeve of this embodiment First, a brief description will be given of the configuration of a belt conveyor using a sleeve according to this embodiment. Fig. 1 is a top view showing the configuration of a belt conveyor 1 according to this embodiment. The belt conveyor 1 has a configuration in which a plurality of cylindrical rollers 3a, 3b are arranged at a predetermined distance between two frames 2 arranged apart from each other, and an endless belt 5 is wound around and stretched around these rollers 3a, 3b. In this embodiment, a motor 4 is provided at one end of roller 3a, and when roller 3a is rotated by motor 4, roller 3b is rotated via belt 5.

[0011] In addition, the roller 3a of this embodiment is provided with a sleeve 10 of this embodiment in the center of the outer surface on which the belt 5 is placed, and the sleeve 10 prevents the belt 5 from becoming biased or meandering while running.

[0012] 2 is a perspective view showing the configuration of a roller 3a provided with a sleeve 10 according to this embodiment. The roller 3a is provided with a rod-shaped rotary shaft 6, which is rotatably supported by a frame 2, on both end surfaces, and the sleeve 10 is fixed to the outer circumferential surface 31 at approximately the center position.

[0013] In this case, the sleeve 10 has a cylindrical sleeve body 11 with a through hole 12, and the cylindrical roller 3a is inserted into the through hole 12 of the sleeve body 11 and fitted onto the roller 3a. By fitting the sleeve 10 onto the roller 3a, the sleeve 10 is fixed to the outer circumferential surface 31 of the roller 3a in a state where it cannot move in the axial direction x and the circumferential direction Cd of the roller 3a.

[0014] [2] Roller configuration Next, the configuration of the roller 3a on which the sleeve 10 is provided will be described. As shown in FIG. 3, the roller 3a is configured as a cylindrical body made of a metal such as iron or aluminum. The rollers 3a are provided with a rotation shaft 6 at the tip ends thereof, which are arranged opposite each other in the axial direction x. If the outer diameter of the roller 3a on which the sleeve 10 is fitted is OD [mm], the outer diameter OD is preferably 27 [mm] or more and 105 [mm] or less. In this embodiment, as an example, a roller 3a with an outer diameter OD of φ46.8 [mm] is used.

[0015] The roller 3a has a smooth outer peripheral surface 31 without any irregularities, and has curved corners 32 at both ends in the axial direction x. The curved corners 32 are surfaces with rounded corners having a predetermined curvature, allowing the ends of the roller 3a to be inserted smoothly into the through-hole 12 of the sleeve 10 without getting caught.

[0016] [3] Sleeve configuration Next, the configuration of the sleeve 10 according to this embodiment will be described. The left side of Fig. 4 is a front view showing the front configuration of the sleeve 10 when viewed from a direction perpendicular to the axial direction x. The right side of Fig. 4 is a side view showing the side configuration of the sleeve 10 when viewed from a direction along the axial direction x.

[0017] The sleeve 10 includes a sleeve body 11 having a cylindrical hollow through-hole 12 that penetrates the thickness along the axial direction x. The sleeve body 11 is a cylindrical body made of an elastic material such as a resin material and has extensibility. The diameter of the through-hole of the sleeve body 11 is selected so that when the roller 3a is inserted into the through-hole 12 from its tip end, the outer peripheral surface 31 of the roller 3a slides against the inner peripheral surface 12a of the through-hole 12.

[0018] In addition, the sleeve body 11 has an elastic force that causes the outer surface of the sleeve body 11 and the inner surface 12a of the through hole 12 to expand and deform radially to follow the outer shape of the roller 3a being inserted into the through hole 12 as the roller 3a is inserted into the through hole 12.

[0019] The material of the sleeve 10 can be an elastic member such as an extensible elastomer, and examples of materials that can be used include polyurethane, polyester elastomer, PVC (Polyvinyl Chloride), silicone, polyamide, polyolefin, and fluororesin.

[0020] Here, ID [mm] refers to the dimension between the opposing inner circumferential surfaces 12a on a line perpendicular to the axial direction x and passing through the center of the through hole 12, before the roller 3a is inserted into the through hole 12 of the sleeve 10 (hereinafter referred to as the inner diameter dimension). It is desirable to select the inner diameter dimension ID to be slightly larger than the outer diameter dimension OD of the roller 3a or slightly smaller than the outer diameter dimension OD of the roller 3a.

[0021] The sleeve 10 according to this embodiment is formed to satisfy the following formula (1), where OD is the outer diameter of the roller 3a and ID is the inner diameter of the through hole 12 in the sleeve body 11. Note that although the unit of "{(OD-ID) / OD}×100" is [%], this will be omitted here and only the numerical value will be shown. The upper and lower limit values in the following formula (1) are values rounded to one decimal place and were derived from the results of a verification test described below. -1.0≦{(OD-ID) / OD}×100≦1.0 (1)

[0022] When the value of "{(OD-ID) / OD}×100" is less than -1.0, the inner diameter ID of the sleeve 10 becomes too small relative to the outer diameter OD of the roller 3a. In this case, it becomes difficult for an operator to push the roller 3a into the through hole 12 of the sleeve 10 with bare hands. Therefore, in order to push the roller 3a into the through hole 12 of the sleeve 10 and position the sleeve 10 at the desired outer peripheral surface position of the roller 3a, a cylindrical body mounting jig is required, as in the past, which reduces the ease of mounting the sleeve 10.

[0023] On the other hand, if the value of "{(OD-ID) / OD}×100" exceeds 1.0, the inner diameter ID of the sleeve 10 becomes too large relative to the outer diameter OD of the roller 3a. In this case, although an operator can easily insert the roller 3a into the through-hole 12 of the sleeve 10 with bare hands, if the roller 3a is then stood upright with its axial direction x aligned vertically after insertion into the through-hole 12 of the sleeve 10, the sleeve 10 will easily slip off the roller 3a due to its own weight. In this case, even if the sleeve 10 is fixed with an adhesive, there is a possibility that the sleeve 10 will slip from the desired outer peripheral surface position of the roller 3a when the belt 5 is stretched over the roller 3a and the belt 5 is running.

[0024] From the above, it is desirable that the sleeve 10 satisfies the condition of the above formula (1) from the viewpoint of improving the workability of attaching the sleeve 10 to the roller 3a and preventing the sleeve 10 from slipping off the roller 3a.

[0025] In the sleeve body 11 according to this embodiment, a tapered surface is formed on the inner peripheral surface 12a of the through hole 12, in which the diameter of the through hole 12 gradually decreases from one opening end 11b to the other opening end 11a of the sleeve body 11 along the axial direction x. In this case, the inner diameter dimension ID used in the above formula (1) is the opening end inner diameter dimension of the opening end 11a, which has the smaller diameter of the through hole 12, of the opening ends 11a, 11b of the sleeve body 11 that face each other in the axial direction x (hereinafter also referred to as the opening end inner diameter dimension ID).

[0026] The opening end inner diameter dimension ID2 of the opening end 11b is larger than the opening end inner diameter dimension ID of the opening end 11a, and is preferably greater than ID [mm] and equal to or less than (ID + 0.3 [mm]). By making the opening end inner diameter dimension ID2 of the opening end 11b of the sleeve body 11 larger than the opening end inner diameter dimension ID of the opening end 11a, it becomes easier to insert the roller 3a into the through hole 12 from the opening end 11b side. Furthermore, by keeping the opening end inner diameter dimension ID2 of the opening end 11b of the sleeve body 11 at or less than + 0.3 [mm] larger than the opening end inner diameter dimension ID of the opening end 11a, the inner circumferential surface 12a can be tightly fixed to the outer circumferential surface 31 of the roller 3a even at the opening end 11b.

[0027] The thickness dimension between the outer peripheral surface and the inner peripheral surface 12a of the sleeve body 11 is not particularly limited as long as it has the effect of improving the ease of attachment to the roller 3a and does not slip off from the roller 3a. In this embodiment, the thickness dimension between the outer peripheral surface and the inner peripheral surface 12a of the sleeve body 11 is, for example, 1.2 mm.

[0028] A liquid or gel adhesive is applied to the inner circumferential surface 12a of the through hole 12 in the sleeve body 11 to reliably adhere the inner circumferential surface 12a of the sleeve 10 to the outer circumferential surface 31 of the roller 3a when the sleeve 10 is fitted onto the roller 3a. The adhesive applied to the inner circumferential surface 12a of the through hole 12 hardens, thereby adhering the sleeve 10 to the outer circumferential surface 31 of the roller 3a. This more reliably fixes the sleeve 10 to the roller 3a, preventing it from moving in the axial direction x and the circumferential direction Cd of the roller 3a. Examples of adhesive materials that can be used include chloroprene rubber-based solvent-based adhesives, cyanoacrylate-based adhesives, and acrylic-modified silicone adhesives. In this embodiment, a chloroprene-based solvent-based adhesive (Bond G17, manufactured by Konishi Co., Ltd.) is used.

[0029] [4] How to attach the sleeve to the roller Next, a method for attaching the sleeve 10 to the roller 3a will be described. In this case, for example, adhesive is applied to the outer peripheral surface 31 of the roller 3a where the sleeve 10 is to be positioned, or to the inner peripheral surface 12a of the sleeve 10. Next, before the adhesive hardens, an operator grips the sleeve 10 and the roller 3a and positions the tip of the roller 3a in the through hole 12 of the sleeve 10 so that the axial direction x of the sleeve 10 and the axial direction x of the roller 3a are aligned. In the sleeve 10 according to this embodiment, it is desirable to position the tip of the roller 3a at the opening end inner diameter dimension ID2 of the opening end 11b, which has the largest diameter dimension of the through hole 12.

[0030] Next, the worker applies force with his bare hands to the sleeve 10 and / or roller 3a so as to push the tip end of the roller 3a toward the inside of the through hole 12 of the sleeve 10. At this time, because the sleeve 10 is formed to satisfy the above formula (1), the worker can push the roller 3a into the inside of the through hole 12 of the sleeve 10 without using a conventional cylindrical body mounting jig, and can move the sleeve 10 to the desired outer peripheral surface position along the axial direction x of the roller 3a using only manual force. At this time, the outer peripheral surface of the sleeve body 11 and the inner peripheral surface 12a of the through hole 12 of the sleeve 10 are elongated and deformed in the radial direction to follow the outer shape of the roller 3a inserted into the through hole 12.

[0031] As a result, the inner diameters ID, ID2 of the through hole 12 of the sleeve 10, which are slightly different from the outer diameter OD of the roller 3a, are expanded by the roller 3a to an inner diameter ID3 that is the same as the outer diameter OD of the roller 3a, as shown in Fig. 5. Then, after the sleeve 10 has been moved to the desired outer peripheral surface position of the roller 3a, curing is performed to harden the adhesive, and the sleeve 10 is fixed to the outer peripheral surface 31 of the roller 3a.

[0032] [5] Verification test A verification test was conducted by preparing multiple types of sleeves 10 with different inner diameter dimensions ID of the through holes 12 to check the ease of mounting each sleeve 10 to the roller 3a and the slippage of each sleeve 10. In the verification test, a roller 3a with an outer diameter dimension OD of φ48.6 [mm] was used as the roller 3a onto which the sleeve 10 was fitted.

[0033] Examples 1 to 3 and Comparative Examples 1 to 7 shown in Table 1 below were prepared as sleeves 10 used in the verification tests. Examples 1 to 3 and Comparative Examples 1 to 7 had the same configuration except for the inner diameter dimension ID of the through hole 12, and the sleeve main body 11 was formed from the same elastic material. Specifically, the length dimension of the sleeve 10 in the axial direction x was 30.0 mm, and the thickness dimension between the outer peripheral surface and the inner peripheral surface 12a of the sleeve main body 11 was 1.2 mm. The sleeve main body 11 was made of urethane (DIC Corporation: T-8198N).

[0034] [Table 1]

[0035] The inner diameter dimension ID of each sleeve 10 in Examples 1 to 3 and Comparative Examples 1 to 7 is shown in the column "Inner diameter dimension ID of sleeve [mm]" in Table 1. The inner peripheral length of the through hole 12 at the inner diameter dimension ID of each sleeve 10 in Examples 1 to 3 and Comparative Examples 1 to 7 is shown in the column "Inner peripheral length of sleeve [mm]" in Table 1. Comparative Example 1 is a commercially available product "SV-303A-BL" from Nitta Corporation, which is difficult for an operator to fit onto the roller 3a with bare hands, and is fitted onto the roller 3a using some kind of cylindrical body mounting jig as shown in Patent Document 2.

[0036] The values of "{(OD-ID) / OD} x 100" and "(ID / OD) x 100" in Table 1 are rounded to the nearest tenth.

[0037] In the verification test, for each of the sleeves 10 of Examples 1 to 3 and Comparative Examples 1 to 7, an actual worker pushed the roller 3a into the through hole 12 of the sleeve 10 with his bare hands without using a cylindrical body mounting jig such as that shown in Patent Document 2, and then moved the sleeve 10 with his bare hands along the axial direction x of the roller 3a to a desired outer peripheral surface position of the roller 3a to verify whether the sleeve 10 could be fitted onto the roller 3a. In the verification of the mounting work, adult men and women with average builds were used as workers.

[0038] Table 1 shows the results of verification of such installation work by workers with their bare hands in the "Installation workability" column. In the "Installation workability" column, "◯" is indicated when the worker was able to fit the sleeve 10 onto the roller 3a with their bare hands without using a cylindrical body installation jig, and "×" is indicated when the worker was unable to fit the sleeve 10 onto the roller 3a with their bare hands.

[0039] Furthermore, for each sleeve 10 of Examples 1 to 3 and Comparative Examples 1 to 7, with the roller 3a inserted inside the through-hole 12 of the sleeve 10, the axial direction x of the roller 3a was oriented vertically, and an operator visually checked whether the sleeve 10 would slide vertically downward from the roller 3a under its own weight. The results are shown in the "Slip-Down Property" column of Table 1. In the "Slip-Down Property" column, "◯" is indicated when the sleeve 10 did not slide vertically downward from the roller 3a under its own weight, and "X" is indicated when the sleeve 10 did slide vertically downward from the roller 3a under its own weight.

[0040] From Table 1, it was confirmed that when the value of "{(OD-ID) / OD}×100" exceeds 1.0%, the inner diameter dimension ID of the sleeve 10 becomes too small compared to the outer diameter dimension OD of the roller 3a, and therefore the worker cannot fit the sleeve 10 onto the roller 3a with his bare hands, and the workability of installing the sleeve 10 decreases.

[0041] On the other hand, it was confirmed that when the value of "{(OD-ID) / OD}×100" is less than -1.0%, when the axial direction x of the roller 3a is oriented vertically, the sleeve 10 attached to the roller 3a slides down along the axial direction x of the roller 3a due to its own weight.

[0042] Therefore, it was confirmed that it is preferable for the sleeve 10 to have an inner diameter ID that satisfies the condition of the above-mentioned formula (1) relative to the outer diameter OD of the roller 3a, based on the effect of improving installation workability and not having any tendency to slip off.

[0043] Next, shear force [N] was measured for Examples 1 to 3 and Comparative Examples 1 to 4, in which the sleeve 10 attached to the roller 3a did not slide down along the axial direction x of the roller 3a due to its own weight. In this verification test, the cylindrical body attachment jig shown in Patent Document 2 was used to insert the roller 3a into the through-hole 12 of each sleeve 10 of Examples 1 to 3 and Comparative Examples 1 to 4. Then, the axial direction x of the roller 3a was oriented vertically, and the cylindrical body attachment jig was pressed downward by a precision universal testing machine (MinebeaMitsumi Inc.: TGI-50kN).

[0044] The shear force applied to the cylindrical body mounting jig when the sleeve 10 mounted on it was moved along the axial direction x of the roller 3a to near the center of the roller 3a was measured using a precision universal testing machine. The "Shear Force [N]" column in Table 1 shows the maximum shear force [N] measured for each of Examples 1 to 3 and Comparative Examples 1 to 4. Note that the shear force is the value when no adhesive is applied to the inner circumferential surface 12a of the sleeve 10.

[0045] In Examples 1 to 3, which satisfied the condition of the above formula (1), the shear force was 75 [N] or more and 290 "N" or less. From the above, it is preferable that the sleeve 10 is such that, when the roller 3a is inserted into the through hole 12 of the sleeve body 11, the axial direction x of the roller 3a is oriented vertically, and the sleeve body 11 is pressed downward in the axial direction x of the roller 3a using a precision universal testing machine (Shimadzu Corporation: Autograph), the measurement result of the shear force using the precision universal testing machine is 75 [N] or more and 290 "N" or less.

[0046] [6] Action and effect According to the above configuration, the sleeve 10 is formed to satisfy the above formula (1) when the outer diameter dimension of the roller 3a is OD [mm] and the inner diameter dimension of the through hole 12 before the roller 3a is inserted into the through hole 12 of the sleeve body 11 is ID [mm]. As a result, the sleeve 10 can be fitted onto the roller 3a by an operator's bare hands without using a conventional cylindrical body mounting jig, making the mounting work easier than before.

[0047] Furthermore, by satisfying the above formula (1), the sleeve 10 can be fitted onto the roller 3a with bare hands by an operator, and the sleeve 10 can be reliably fixed to the roller 3a without slipping off after fitting. As a result, the sleeve 10 can be fixed to the outer peripheral surface 31 of the roller 3a in a state where it cannot move in the axial direction x or the circumferential direction Cd of the roller 3a, thereby reliably preventing deviation of the belt 5 while it is running. In this case, by fixing the sleeve main body 11 of the sleeve 10 to the outer peripheral surface 31 of the roller 3a using an adhesive, the sleeve main body 11 can be fixed even more firmly to the outer peripheral surface 31 of the roller 3a.

[0048] [7] Other embodiments The present invention is not limited to the above-described embodiment, but includes modifications as described below. In the above-described embodiment, the sleeve 10 is fixed to the center of the roller 3a, but the present invention is not limited to this. For example, as in the belt conveyor 40 shown in FIG. 6, a plurality of sleeves 10 may be provided at predetermined intervals in the axial direction x of the roller 3a. Note that, in the case of a roller 3a provided with a plurality of sleeves 10, at least one of the plurality of sleeves 10 may be used as the sleeve 10 of this embodiment.

[0049] In the above-described embodiment, an adhesive is provided between the inner peripheral surface 12a of the through hole 12 of the sleeve 10 and the outer peripheral surface 31 of the roller 3a, but the present invention is not limited to this. For example, a configuration may be adopted in which no adhesive is provided between the through hole 12 of the sleeve 10 and the outer peripheral surface 31 of the roller 3a.

[0050] In the above-described embodiment, the case has been described in which the opening end inner diameter dimension of the through hole 12 at one opening end 11a of the opposing opening ends 11a, 11b of the sleeve body 11 is defined as ID in formula (1), but the present invention is not limited to this. In sleeves according to other embodiments, for example, the opening end inner diameter dimensions of both through holes 12 at the opposing opening ends 11a, 11b of the sleeve body 11 may be defined as ID in formula (1), or the inner diameter dimension at a predetermined position inside the through hole 12 between the opposing opening ends 11a, 11b of the sleeve body 11 may be defined as ID in formula (1).

[0051] In the above-described embodiment, a tapered surface in which the inner diameter dimension of the through hole 12 gradually decreases from one opening end 11b to the other opening end 11a of the sleeve body 11 is formed on the inner circumferential surface 12a of the through hole 12, but the present invention is not limited to this. As described above, a sleeve according to another embodiment may be a sleeve in which all of the through holes 12 between the opposing opening ends 11a, 11b of the sleeve body 11 have an inner diameter dimension ID, and the inner circumferential surfaces 12a of the through holes 12 do not form a tapered surface.

[0052] Furthermore, in the above-described embodiment, a tapered surface in which the inner diameter of through hole 12 gradually decreases from one open end 11b of sleeve body 11 to the other open end 11a is formed on inner circumferential surface 12a of through hole 12, but the present invention is not limited to this. For example, in a sleeve according to another embodiment, the inner circumferential surface of the through hole may have a tapered surface in which the inner diameter of the through hole gradually decreases from the open end to a predetermined position of the through hole, and the inner diameter of the through hole at the position where the inner diameter of the through hole is smallest may be ID in the above formula (1).

[0053] 7, an apex portion 52a where the inner diameter dimension is smallest is provided on an inner circumferential surface 53a near a center C1 of a through hole 52 of a sleeve body 51. In the sleeve body 51, tapered surfaces 52b, 52c are formed on the inner circumferential surface 53a of the through hole 52, so that the inner diameter dimension of the through hole 52 gradually decreases from the opening ends 51a, 51b toward the apex portion 52a. In this case, the inner diameter dimension at the position where the apex portion 52a of the through hole 52 is provided is the smallest inner diameter dimension ID.

[0054] In addition, in the sleeve 50, it is desirable that the inner diameter dimensions ID4, ID5 of the opening ends 51a, 51b of the sleeve body 51 are each larger than the inner diameter dimension ID of the through hole 52. For example, it is desirable that the opening end inner diameter dimension of the through hole 52 at at least one of the opposing opening ends 51a, 51b of the sleeve body 51 is greater than ID [mm] and not greater than (ID+0.3) [mm].

[0055] In addition, in the sleeve 50, the inner diameter dimension of the through hole 52 gradually decreases from the opening ends 51a, 51b toward the top portion 52a, and by inserting a roller 3a into the through hole 52, the roller 3a pushes the inner surface 53a of the through hole 52 in the outward radial direction, thereby deforming the outer surface of the sleeve 50 so that it bulges outward.

[0056] Other sleeves may have a configuration symmetrical about the center C1, with the inner circumferential surface having a tapered surface (curved surface) in which the inner diameter of the through hole gradually decreases in a curved manner from both opening ends toward the center C1, or may have an inner circumferential surface having a tapered surface with a flat apex. Furthermore, the position of the through hole with the smallest inner diameter dimension ID may be shifted in the axial direction x from the center C1 of the sleeve body. Other specific configurations and shapes of the present invention may be used as long as the object of the present invention can be achieved. [Explanation of symbols]

[0057] 1 conveyor belt 3a, 3b Roller 10, 50 sleeves 11, 51 Sleeve body 12, 52 through holes 52b, 52c tapered surface OD roller outer diameter ID sleeve inner diameter ID2, ID4, ID5 Sleeve open end inner diameter dimensions

Claims

1. A cylindrical sleeve fitted onto a roller for a belt conveyor and fixed to the outer circumferential surface of the roller, a sleeve body having a through hole through which the roller is inserted; When the outer diameter dimension of the roller is OD [mm] and the inner diameter dimension, which is the diameter dimension of the through hole before the roller is inserted into the through hole of the sleeve body, is ID [mm], the following formula (1) is satisfied: sleeve. -1.0≦{(OD-ID) / OD}×100≦1.0...(1)

2. The ID in the formula (1) is the inner diameter of the opening end of the through hole at at least one of the opposing opening ends of the sleeve body. The sleeve of claim 1 .

3. The sleeve body has a tapered surface on an inner peripheral surface of the through hole, where the inner diameter dimension of the through hole gradually decreases, and the ID in the formula (1) is the inner diameter dimension of the through hole at a position where the inner diameter dimension is smallest. The sleeve of claim 1 .

4. The inner diameter of the opening end of the through hole at at least one of the opposing opening ends of the sleeve body is greater than ID [mm] and equal to or less than (ID + 0.3) [mm]. The sleeve of claim 1 .

5. The sleeve body is When the roller is inserted into the through hole, the outer peripheral surface of the sleeve body and the inner peripheral surface of the through hole are elongated and deformed in the radial direction to follow the outer shape of the roller inserted into the through hole. The sleeve of claim 1 .

6. an adhesive is provided on an inner circumferential surface of the through hole of the sleeve body to bond the inner circumferential surface to an outer circumferential surface of the roller; The sleeve of claim 1 .

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