Rubber sheet crushing device

Abstract

To provide a rubber sheet crushing device capable of producing granular rubber by crushing a rubber sheet.SOLUTION: A rubber sheet crushing device comprises an inlet 21 into which a rubber sheet W1 is introduced, a crusher 3 which crushes the rubber sheet W1 introduced from the inlet 21 to produce granular rubber, and a discharge port 22 which discharges the granular rubber produced by the crusher 3. The crusher 3 includes a crushing section 31 that has a fixed blade 34 and a movable blade 33, and crushes the rubber sheet W1 by the fixed blade 34 and the movable blade 33, and a perforated plate 35 that is disposed between the crushing section 31 and the discharge port 22, allows passage of granular rubber having a diameter equal to or smaller than a predetermined value and prevents passage of granular rubber having a diameter larger than the predetermined value. A minimum distance between the movable blade 33 and the fixed blade 34 is set to be between 1 mm and 5 mm.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a rubber sheet crushing device. [Background technology]

[0002] A conventional pulverizer is described in Patent Document 1. The pulverizer described in Patent Document 1 is a tire pulverizer that pulverizes rubber pieces of tires into minute pieces.

[0003] The tire crusher includes a fixed blade and a rotary blade unit facing the fixed blade. The tire crusher can crush rubber pieces with a particle size of about 30 mm using the fixed blade and the rotary blade unit to produce crushed pieces with a particle size of about 8 mm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-220347 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as mentioned above, although there have been crushers such as those described in Patent Document 1 that crush rubber pieces with particle sizes of approximately 30 mm, there have been no crushing devices that crush rubber sheets to produce granular rubber.

[0006] The present invention has been made in view of the above circumstances, and has an object to provide a rubber sheet crushing device that can produce granular rubber by crushing a rubber sheet. [Means for solving the problem]

[0007] One embodiment of the rubber sheet crushing device of the present invention comprises an inlet through which a rubber sheet is fed, a crusher that crushes the rubber sheet fed through the inlet to produce granular rubber, and an outlet that discharges the granular rubber produced by the crusher, wherein the crusher has a crushing section that has a fixed blade and a movable blade and crushes the rubber sheet using the fixed blade and the movable blade, and a perforated plate that is positioned between the crushing section and the outlet and allows the passage of granular rubber having a predetermined diameter or less and prevents the passage of granular rubber having a diameter greater than the predetermined diameter, and the minimum distance between the movable blade and the fixed blade is 1 mm or more and 5 mm or less.

[0008] According to the rubber sheet crushing device of the present invention, the minimum distance between the movable blade and the fixed blade is 1 mm or more and 5 mm or less, so that the rubber sheet can be torn by the movable blade and the fixed blade, thereby producing rubber granules from the rubber sheet.

[0009] The average particle size of the granular rubber is preferably on the order of millimeters, which makes the resulting granular rubber suitable for use as cushioning material, vibration-damping material, sound-absorbing material, and filler for artificial turf.

[0010] In addition, the minimum distance between the movable blade and the fixed blade is preferably variable, so that the distance between the movable blade and the fixed blade can be adjusted according to the thickness of the rubber sheet to be fed, and rubber with a desired particle size can be produced. [Effects of the Invention]

[0011] The rubber sheet crushing device according to the above aspect of the present invention has an advantage in that it can produce granular rubber by crushing a rubber sheet. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic front view of a rubber sheet crushing device according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an enlarged view of the periphery of a crusher of the rubber sheet crushing device according to the embodiment. [Figure 3] 1 is a schematic diagram of an entire system using a rubber sheet crushing device according to an embodiment of the present invention. [Figure 4] Photographs showing the process of changing from a rubber sheet to granular rubber. DETAILED DESCRIPTION OF THE INVENTION

[0013] <Embodiment> The rubber sheet crushing device 10 according to this embodiment is a device that crushes a rubber sheet W1 to produce granular rubber (hereinafter referred to as "granular rubber W2"). ​​As shown in FIG. 1, the rubber sheet crushing device 10 includes a stand 1, a housing 2 having an inlet 21 and a discharge outlet 22, a crusher 3, and a drive device 4 that drives the crusher 3.

[0014] The granular rubber W2 produced by the rubber sheet crushing device 10 is used, for example, as cushioning material, vibration-damping material, sound-absorbing material, and filler for artificial turf. The average particle size of the granular rubber W2 is preferably on the order of millimeters. In this specification, the term "millimeters" means 1 mm or more and 10 mm or less.

[0015] The rubber sheet W1 used as the raw material is preferably a sheet material having a thickness of 5 mm or less. The rubber sheet W1 is not limited to a uniform thickness, and may have a thickness that varies continuously between 1 mm and 5 mm. For example, a strip-shaped scrap material (sometimes referred to as a "strip-shaped sheet material") such as the edge of an entrance mat is used as the rubber sheet W1. Such scrap material is generated by cutting the edge of a mat when processing an entrance mat or the like into a product, and is discarded as unnecessary material at the entrance mat manufacturing site. There are no particular restrictions on the width of the strip-shaped sheet material, but it is preferably 10 mm or more and 50 mm or less, and more preferably 20 mm or more and 30 mm or less.

[0016] The material of the rubber sheet W1 is not particularly limited, but is preferably nitrile rubber (NBR), for example. However, the rubber sheet W1 may also be made of other materials such as natural rubber, styrene butadiene rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, urethane rubber, silicone rubber, fluororubber, and chlorosulfonated polyethylene rubber.

[0017] The rubber sheet crushing device 10 according to this embodiment crushes rubber sheets W1 that would otherwise be discarded into granules, allowing them to be reused as rubber granules W2. Note that although the rubber sheet W1 according to this embodiment is strip-shaped, the present invention is not limited to strip-shaped shapes and may be, for example, square, circular, polygonal, or the like.

[0018] 1, for convenience of explanation, the direction perpendicular to the installation surface G1 is defined as the "vertical direction," the direction in which the drive unit 4 and the housing 2 are aligned is defined as the "length direction," and the direction perpendicular to the vertical direction and the length direction is defined as the "width direction." Note that, although the installation surface G1 is described as being a horizontal plane, it does not necessarily have to be a horizontal plane.

[0019] In this specification, "parallel" refers not only to cases where two lines, sides, surfaces, etc. do not intersect even when extended, but also to cases where the angle between the two lines, sides, surfaces, etc. is within a range of 10°. Furthermore, "orthogonal" refers to cases where the angle between the two lines, sides, surfaces, etc. is within a range of 90°±10°.

[0020] (Frame 1) The stand 1 supports the housing 2, the crusher 3, and the drive unit 4 on an installation surface G1. As shown in FIG. 1, the stand 1 includes a plurality of legs 11 and a base 12 connected to the upper ends of the plurality of legs 11. The upper surface of the base 12 is parallel to the installation surface G1. The housing 2 and the drive unit 4 are installed on the upper surface of the base 12.

[0021] (Case 2) The housing 2 has an inlet 21 and a discharge outlet 22, and accommodates the pulverizer 3 therein between the inlet 21 and the discharge outlet 22. The inlet 21 is an opening through which a plurality of rubber sheets W1 are fed. Typically, the rubber sheets W1 are fed into the inlet 21 in a tangled state. In this embodiment, the inlet 21 is an opening provided in the hopper 24, and is preferably an opening facing upward or diagonally upward. This makes it easy to feed a plurality of rubber sheets W1 carried by a belt conveyor, which is the conveying device 5, into the inlet 21, as shown in FIG. 3 .

[0022] The discharge outlet 22 is an opening surface through which the granular rubber W2 crushed by the crusher 3 is removed from the housing 2. In this embodiment, the discharge outlet 22 opens downward. As shown in FIG. 3, a discharge path 61 is connected to the discharge outlet 22. The granular rubber W2 is collected in the collection device 6 through the discharge path 61. By collecting the granular rubber W2 in the collection device 6, an operator can remove the required amount of granular rubber W2 from the collection device 6 as needed.

[0023] (Crusher 3) The crusher 3 crushes the tangled rubber sheet W1 fed through the feed port 21 to produce rubber granules W2. As shown in Fig. 2, the crusher 3 includes a crushing section 31 that crushes the rubber sheet W1, and a perforated plate 35 that allows only rubber granules W2 of a desired size to pass through from the rubber crushed by the crushing section 31. As shown in Fig. 2, the crushing section 31 includes a rotor 32, a plurality of movable blades 33 attached to the rotor 32, and a plurality of fixed blades 34.

[0024] The rotor 32 rotates by power transmitted from the drive unit 4. The rotation axis 323 of the rotor 32 is parallel to the width direction. The rotor 32 preferably has a triangular prism shape with the triangular bottom and top surfaces perpendicular to the rotation axis 323. This allows a space SP1 to be secured between the rotor 32 and the perforated plate 35, and the granular rubber W2 can be repeatedly crushed by the movable blade 33 and the fixed blade 34 until the desired size of granular rubber W2 is obtained.

[0025] A pulley 321 is connected to the rotor 32. The pulley 321 is connected to the output shaft of the drive unit 4 via a power transmission body 322. The pulley 321 rotates due to the power from the drive unit 4, and the rotor 32 rotates around a rotation shaft 323. There are no particular restrictions on the rotation speed of the rotor 32, but it is preferably 30 rpm or more and 180 rpm or less, and more preferably 40 rpm or more and 100 rpm or less.

[0026] The movable blade 33 is disposed along the front edge in the direction of rotation on the side surface (a surface perpendicular to the bottom and top surfaces) of the rotating body 32. The tip of the movable blade 33 protrudes from the edge of the rotating body 32. The movable blade 33 is preferably fixed to the rotating body 32 with a screw 332. This allows the movable blade 33 to be removably attached to the rotating body 32, and the existing movable blade 33 can be replaced with a new movable blade 33 as needed.

[0027] The fixed blade 34 is disposed at a position facing the rotation trajectory of the movable blade 33. The fixed blade 34 is fixed to the housing 2. The fixed blade 34 may be disposed in only one location or in multiple locations, as long as it faces the rotation trajectory of the movable blade 33. In this embodiment, the fixed blade 34 is attached in only one location.

[0028] The minimum distance between the fixed blade 34 and the movable blade 33 is preferably 1 mm or more and 5 mm or less, more preferably 1.5 mm or more and 4 mm or less, and even more preferably 2 mm or more and 3 mm or less. This configuration allows the rubber sheet W1 to be torn without cutting (slicing). When attempting to produce a large amount of fine rubber granules W2 from a highly flexible rubber sheet W1, it is difficult to produce rubber granules W2 of the desired size by cutting the rubber sheet W1. However, by repeatedly tearing the rubber sheet W1, it is possible to produce rubber granules W2 of the desired size.

[0029] 4 shows the process by which the rubber sheet W1 is torn by repeatedly applying impacts between the fixed blade 34 and the movable blade 33 without cutting the rubber sheet W1, with the minimum distance between the fixed blade 34 and the movable blade 33 set to 1 mm or more and 5 mm or less. From left to right, Fig. 4 shows photographs of rubber gradually changing from the rubber sheet W1 to granular rubber W2.

[0030] The minimum distance between the fixed blade 34 and the movable blade 33 is preferably variable within a range of 1 mm to 5 mm. As shown in FIG. 2 , the movable blade 33 has multiple elongated holes 333 extending in a direction perpendicular to the rotation axis 323 of the rotor 32, and is fixed to the rotor 32 by screws 332 inserted through the elongated holes 333. This allows the minimum distance between the fixed blade 34 and the movable blade 33 to be variable. The movable blade 33 is also preferably provided with an adjustment mechanism 331 that can move the movable blade 33 in a direction perpendicular to the rotation axis 323. The adjustment mechanism 331 includes, for example, a fixed seat with a threaded hole fixed to the rotor 32 and a bolt threaded into the threaded hole of the fixed seat. The bolt presses against the end face of the fixed blade 34, thereby moving the movable blade 33.

[0031] The perforated plate 35 allows rubber granules W2 of a predetermined diameter or less to pass through among the rubber granules W2 crushed by the crushing unit 31, and prevents rubber granules of a larger diameter from passing through. The perforated plate 35 is removably attached to the housing 2 between the crushing unit 31 and the discharge port 22. The "predetermined diameter" means a diameter set according to the particle size of the rubber granules desired by the user.

[0032] The perforated plate 35 is preferably formed so as to follow the movement path of the rotor 32. In this embodiment, the perforated plate 35 is formed by processing a punched metal so as to be curved, and is formed in a semicircular arc shape in a cross section perpendicular to the width direction. The diameter of the holes formed in the perforated plate 35 is, for example, preferably 3 mm to 20 mm, and more preferably 5 mm to 10 mm.

[0033] The minimum distance between the perforated plate 35 and the movable blade 33 is preferably 3 mm or less, more preferably 1 mm or less, and even more preferably 0.5 mm or less. This allows the rubber in the space SP1 to move as the rotor 32 moves, making it easier to repeatedly move the rubber between the fixed blade 34 and the movable blade 33. The crusher 3 also preferably has a guide 23 that guides the rubber to the tip of the fixed blade 34. The guide 23 in this embodiment smoothly connects to the fixed blade 34. The guide 23 allows the rubber moved by the rotor 32 to be guided between the fixed blade 34 and the movable blade 33, reducing the amount of rubber that cannot be crushed into granular rubber W2.

[0034] Furthermore, by setting the minimum distance between the perforated plate 35 and the movable blade 33 to 3 mm or less, the rotor 32 can easily push the granular rubber W2 having a predetermined diameter or less into the holes in the perforated plate 35, thereby reducing the accumulation of the granular rubber W2 having a predetermined diameter or less. The movable blade 33 may come into contact with the perforated plate 35.

[0035] The granular rubber W2 that passes through the holes in the perforated plate 35 exits the housing 2 through the discharge port 22. The discharge port 22 and the collection device 6 are connected by a discharge path 61, as shown in FIG. 3. A blower 62 is provided in the discharge path 61. The granular rubber W2 rides on the airflow created by the blower 62, moves down the discharge path 61, and moves to the collection device 6. As a result, the granular rubber W2 that exits the housing 2 is collected in the collection device 6.

[0036] (Driver 4) The driving device 4 drives the rotating body 32. The driving device 4 is a motor 41. As shown in FIG. 1, power from the driving device 4 is transmitted to the rotating body 32 via a power transmission body 322. The motor 41 is connected to a control panel, and is controlled to be turned on and off by an operator operating the control panel.

[0037] (Action and effect) As described above, the rubber sheet crusher 10 according to this embodiment can tear the rubber sheet W1 using the movable blade 33 and the fixed blade 34, thereby generating rubber granules W2 from the rubber sheet W1. As a result, rubber sheets W1 that would previously have been discarded, such as offcuts from entrance mats, can be reused as rubber granules W2, contributing to resource and energy conservation. The rubber sheets W1 can be fed into the rubber sheet crusher 10 in a tangled state, and there is no need to untangle the tangled rubber sheets W1 and arrange them in a straight line in advance.

[0038] Furthermore, since the minimum distance between the movable blade 33 and the fixed blade 34 is variable, the distance between the movable blade 33 and the fixed blade 34 can be adjusted according to the thickness of the rubber sheet W1, and granular rubber W2 can be produced regardless of the thickness of the rubber sheet W1.

[0039] <Modification> The above embodiment is merely one of various embodiments of the present invention. The embodiment can be modified in various ways depending on the design, etc., as long as the object of the present invention can be achieved. Modifications of the embodiment are listed below. The modifications described below can be applied in appropriate combinations.

[0040] In the above embodiment, the transport device 5 throws the rubber sheet W1 into the throw-in port 21 of the rubber sheet crushing device 10. However, the rubber sheet W1 may be thrown into the throw-in port 21 manually by an operator.

[0041] In the above embodiment, the produced granular rubber W2 is collected in the collection device 6, but it may be taken out directly from the discharge port 22 without being collected in the collection device 6.

[0042] The perforated plate 35 is removably attached to the housing 2, but may be formed integrally with the housing 2. Alternatively, multiple types of perforated plates 35 with different hole diameters may be prepared, and the user may select the perforated plate 35 according to the particle size of the granular rubber W2 desired by the user. [Explanation of symbols]

[0043] 10 Rubber sheet crusher 2. Case 21 Inlet 22 Outlet 3. Crusher 31 Crushing section 32 Rotating body 33 Movable blade 34 Fixed blade 35 Perforated plate 4. Drive unit W1 rubber sheet W2 Granular Rubber

Claims

1. an inlet into which the rubber sheet is inserted; a crusher that crushes the rubber sheet fed through the feeding port to generate granular rubber; a discharge port for discharging the granular rubber produced by the pulverizer; Equipped with The crusher is a crushing unit having a fixed blade and a movable blade, and crushing the rubber sheet with the fixed blade and the movable blade; A perforated plate is disposed between the crushing section and the discharge port, and allows the passage of the granular rubber having a predetermined diameter or less and prevents the passage of the granular rubber having a diameter exceeding the predetermined diameter; and The minimum distance between the movable blade and the fixed blade is 1 mm or more and 5 mm or less. Rubber sheet crushing device.

2. The average particle size of the granular rubber is in the millimeter order. The rubber sheet crushing device according to claim 1.

3. The minimum distance between the movable blade and the fixed blade is variable. The rubber sheet crushing device according to claim 1 or 2.

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