Rotary blade and two-axis rotary crusher

Abstract

To provide a rotary cutter which can realize good withdrawal characteristics from between rotary cutters of crushed products while reducing costs by using one type of rotary cutter.SOLUTION: A rotary cutter, which is attached to a rotatable rotary shaft and crushes a processed product between itself and another rotary cutter or a stationery cutter, comprises: a stem fixed to the rotary shaft; and a cutting part located at an outer peripheral end edge of the stem. A length of the stem in a direction along the rotary shaft is shorter than a length of the cutting part along the rotary shaft.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a rotary blade and a two-shaft rotary crushing device. [Background technology]

[0002] Patent Document 1 discloses a crushing device that includes at least two rotors, each consisting of a large number of rotary blade plates arranged at approximately regular intervals on the same axis, each having a plurality of cutting edges arranged at approximately equal intervals on the outer periphery, and a drive means for rotating the set of rotors in opposite directions, with each set of rotors being positioned so that the rotational trajectory of the cutting edges passes between the rotary blade plates of the opposing rotor, and the material to be processed dropped onto the rotors is sheared or crushed by the rotary blade plates at least when the rotors are rotating in the forward direction, and the cutting edge circles of the rotary blade plates are different for each rotor of the set.

[0003] With this crushing device, the crushing force of the cutting edge with a smaller cutting edge circle is stronger than the crushing force of the cutting edge with a larger cutting edge circle, so the rotor with the cutting edge with a smaller cutting edge circle is suitable for shearing and crushing relatively hard or large objects, while the rotor with the cutting edge with a larger cutting edge circle can process relatively soft objects at high speed and efficiently, and can also secondarily crush objects that have been crushed by the rotor with the cutting edge with a smaller cutting edge circle. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2001-334159 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the crushing device described in Patent Document 1 mentioned above, in order to make the cutting edge circles of the rotary blade plates different for each set of rotors, it was necessary to prepare two types of rotary blades with different shapes, which posed the problem of increasing the number of parts, resulting in higher part costs and management costs.

[0006] In addition, since the objects to be crushed by each rotary blade are different, with hard and large objects being crushed and soft objects being crushed, when either of the objects is crushed, an imbalance in the crushing load between the rotary blades occurs, resulting in a decrease in crushing efficiency and differences in the degree of wear on the rotary blades.

[0007] Furthermore, because the length of the base portion that makes up the rotary blade and the cutting edge in the direction along the rotor, i.e., the thickness, are equal, there is a problem that the crushed material may get caught between adjacent rotary blades between the rotors, increasing the load associated with rotation or causing the rotation to become locked.

[0008] In view of the above-mentioned problems, the present invention aims to provide a rotary blade and a two-axis rotary crushing device that can reduce costs by using a single type of rotary blade while achieving good separation characteristics for the crushed material from between the rotary blades. [Means for solving the problem]

[0009] In order to achieve the above object, a first characteristic configuration of the rotary blade according to the present invention is a rotary blade attached to a rotatable rotary shaft for crushing an object to be processed, the rotary blade comprising a base portion fixed to the rotary shaft and a blade portion disposed on an outer peripheral edge of the base portion, the blade portion being made of a plurality of plate-like bodies. are arranged around the entire outer peripheral edge of the base portion. and is fixed to the outer peripheral edge of the base by welding, so that the length of the base in the direction along the rotation axis is shorter than the length of the blade portion in the direction along the rotation axis, and the blade portion is configured to protrude beyond the base in both directions along the rotation axis.

[0010] The rotary blade is composed of a base and a blade portion, with the base fixed to the rotary shaft and the blade portion disposed on the outer peripheral edge of the base. The length of the base in the direction along the rotary shaft, i.e., its thickness, is shorter than the length of the blade portion in the direction along the rotary shaft, i.e., its width. Material that is crushed between the blade portion of the rotary blade and the blade portion of another rotary blade or the blade portion of the fixed blade and is drawn in in the direction of rotation easily escapes and falls downward through the space formed by the base, which is thinner than the width of the blade portion, greatly reducing the frequency of jamming.

[0011] By constructing the blade section from multiple plates and welding them to the outer edge of the base, it is possible to easily manufacture rotary blades with complex shapes when viewed in the direction of the rotation axis.In addition, it is possible to ensure space for the crushed material to escape on both sides of the rotation axis of the base, which is made thinner than the width of the blade section.

[0012] In addition, since the cutting edge is arranged around the entire outer periphery of the base, The material to be processed is efficiently crushed by the blades arranged over the entire area of ​​the rotary blade in the direction of rotation.

[0013] Same number two The characteristic configuration of this embodiment is that, in addition to the first characteristic configuration described above, the base and the blade portion are both made of plate-like bodies, the thickness of the blade portion is thinner than the thickness of the base, and the length of the blade portion in the direction along the rotation axis is constant.

[0014] By making the base thick to ensure sufficient strength while making the blade thin, the rotary blade can be made lighter overall, and the material to be processed can be efficiently crushed by the blade, which has a constant length in the direction along the rotation axis.

[0015] Same number three The characteristic configuration of this embodiment is that, in addition to the first characteristic configuration described above, when viewed in the direction of the rotation axis, the base portion has three peaks and valleys alternately formed at equal intervals along the circumferential direction, and acute-angle hook portions are formed between each peak and each valley.

[0016] As the rotary blade rotates, the material to be treated is caught by the hook portion and caught in the valley portion, thereby enabling efficient crushing.

[0017] The first characteristic feature of the twin-shaft rotary crushing device according to the present invention is that the first to third rotary shafts are provided on each of the pair of parallelly arranged rotary shafts. three The rotary blades having any one of the above characteristic configurations are arranged at regular intervals along each rotary shaft so as to intersect with each other.

[0018] The material to be processed can be efficiently crushed at the intersection of the rotary blades arranged on each of the pair of rotary shafts. [Effects of the Invention]

[0019] As described above, according to the present invention, it is possible to provide a rotary blade and a two-shaft rotary crushing device that can reduce costs by using a single type of rotary blade while achieving good separation characteristics for the crushed material from between the rotary blades. [Brief explanation of the drawings]

[0020] [Figure 1] (a) is a side view of the twin-shaft rotary crusher, and (b) is a plan view of the main parts of the twin-shaft rotary crusher. [Figure 2] (a) is a cross-sectional view of the main part of the crushing chamber of the two-shaft rotary crusher, (b) is a cross-sectional view along line AA in Figure 2(a), and (c) is a cross-sectional view along line BB in Figure 2(a). [Figure 3] (a) is a cross-sectional view taken along line CC in Figure 2(c), and (b) is a cross-sectional view taken along line DD in Figure 3(a). [Figure 4] (a) is a front view of the rotary blade, (b) is a front view of the base before the blade is welded, (c) is a plan view of the rotary blade, (d) is a bottom view of the rotary blade, (e) is a right side view of the rotary blade, and (f) is a cross-sectional view of the line EE in Figure 5(a). [Figure 5] (a) is a perspective view of a rotary blade, and (b) is an explanatory diagram of the rotation trajectory of adjacent rotary blades and spacers fixed to a pair of rotary shafts. [Figure 6]1(a) and 1(b) are explanatory diagrams of two types of modes for adjusting the phase of a rotary blade attached to a rotary shaft. DETAILED DESCRIPTION OF THE INVENTION

[0021] Preferred embodiments of the rotary blade and the two-shaft rotary crushing device according to the present invention will be described below. [Configuration of the two-axis rotary crusher] 1(a) and (b) show an example of a biaxial rotary crusher 1. The biaxial rotary crusher 1 includes a hopper section 2 into which materials to be processed are fed, and a crushing section 3 that crushes the materials fed into the hopper section 2. A pair of inverter-driven drive motors 4A, 4B are arranged on the side (X-axis direction) of the crushing section 3, and the output shafts of the drive motors 4A, 4B are drivingly connected to the rotating shafts 8A, 8B of the two-shaft rotary crushing device 1 via reducers 5A, 5B and drive connecting mechanisms 6A, 6B.

[0022] 2(a), (b), (c) and 3(a) and (b) show the structure of the main parts of the crushing unit 3. The crushing unit 3 has two rotating shafts 8A, 8B rotatably supported in parallel to each other by bearings 7A, 7B provided on opposing sides of a substantially rectangular frame 3F along the Y-axis direction. Six rotating blades 10A, 10B are arranged on each of the rotating shafts 8A, 8B via spacers 9A, 9B so as to maintain a predetermined distance between them, and the tips of the rotating blades 10A, 10B cross each other alternately. Furthermore, fixed blades 11A and 11B are provided on opposing sides of the frame 3F along the X-axis direction, and are disposed in the gap between the rotary blades 10A and 10B.

[0023] The cross section of each rotating shaft 8A, 8B is formed in a regular hexagon, and each rotating blade 10A, 10B is inserted into each rotating shaft 8A, 8B through a regular hexagonal hole 10C formed in the center, so that it rotates integrally with the rotating shaft 8A, 8B.

[0024] The spacers 9A and 9B are cylindrical bodies with a regular hexagonal hole 9C formed in the center, and rotate integrally with the rotating shafts 8A and 8B by being inserted into the spacers 9A and 9B. Six square pieces 9D are evenly arranged around the outer periphery of the cylindrical spacers 9A and 9B.

[0025] The ends of the rotary shafts 8A, 8B are provided with thrust lock mechanisms 8C. The thrust lock mechanisms 8C are a mechanism that fastens and fixes each rotary blade 10A, 10B to the respective rotary shafts 8A, 8B by inserting six rotary blades 10A, 10B from one end of the rotary shafts 8A, 8B, fitting a pressed ring thereon, and then engaging the pressing ring in a groove formed in one end of the rotary shafts 8A, 8B, and tightening multiple bolts arranged around the pressing ring to press the pressed ring toward the rotary blades 10A, 10B.

[0026] In the crushing space above each of the rotating shafts 8A and 8B (in the Z-axis direction), the rotary blades 10A and 10B are rotated in opposite directions toward the center, whereby the material fed into the hopper section 2 is crushed by the shearing force or impact force of each of the rotary blades 10A and 10B and falls below the crushing section 3.

[0027] In addition, below the intersection area of ​​each rotary blade 10A, 10B, a screen 12 is arranged to catch the material to be processed so that it does not fall into a pocket P, which is a space formed between the cutting edges of each rotary blade 10A, 10B as they rotate.

[0028] In the unlikely event that the material to be processed becomes caught between the rotary blades 10A and 10B and becomes locked, the rotary blades 10A and 10B are rotated in the opposite direction to release the lock, and the material to be processed is crushed between the rotary blades 10A and 10B and the fixed blades 11A and 11B.

[0029] [Rotary blade configuration] Since both rotary blades 10A and 10B have the same shape, the following description will focus on rotary blade 10A. Rotary blade 10A is rotatably attached to the above-mentioned rotary shaft 8A, and is a blade that crushes the material to be processed between itself and another rotary blade 10B or fixed blade 11B.

[0030] 4(a) to (f) and 5(a) and (b) show a rotary blade 10A. The rotary blade 10A comprises a base 10D fixed to the rotary shaft 8A (see Figure 2(a)) and a blade portion 10E arranged on the outer peripheral edge of the base 10D, and is configured so that the length of the base 10D in the direction along the rotary shaft 8A, i.e., thickness L1, is shorter than the length of the blade portion 10E in the direction along the rotary shaft 8A, i.e., width L2 (see Figure 4(f)).

[0031] Specifically, the base 10D is made of a general structural rolled steel material SS having a thickness L1 of 80 mm, and the cutting edge 10E is made of a plurality of wear-resistant steel plates having a width L2 of 100 mm and a thickness of 25 mm, and the cutting edge 10E extends so as to protrude 10 mm evenly from the base 10D in both directions along the rotary shaft 8A. The diameter of the rotary blade 10A is set to 900 mm. Episode It goes without saying that the cutting edge is not limited to these values ​​and may be set as appropriate.

[0032] The crushed material that is crushed between the blade portion 10E of the rotary blade 10A and the blade portion of another rotary blade 10B or the blade portion of the fixed blade 11B and drawn in the direction of rotation easily escapes and falls downward through the space SP formed by the base portion 10D, whose thickness L1 is thinner than the width L2 of the blade portion 10E, thereby greatly reducing the frequency of biting.

[0033] Furthermore, the blade portion 10E extends so as to protrude in both directions along the rotation axis 8A beyond the base portion 10D, so that spaces SP through which the crushed material can escape downward are secured on both sides of the base portion 10D.

[0034] As shown in Fig. 4(b), the base 10D is formed by cutting a polygonal plate-like body made of general structural rolled steel SS using a laser processing machine, etc. As shown in Fig. 4(a), the blade portion 10E made of a plate-shaped wear-resistant steel plate is fixed by welding around substantially the entire outer periphery of the base 10D, so that the rotary blade 10A can be easily manufactured even if the rotary blade has a complex shape when viewed in the direction of the rotation axis.

[0035] In other words, both the base 10D and the blade 10E are formed as plate-like bodies, the thickness of the blade 10E is thinner than the thickness of the base 10D, and the length L2 of the blade 10E in the direction along the rotation axis 8A is constant.

[0036] The base portion 10D is thick to ensure sufficient strength, while the cutting portion 10E is thin, so that the rotary blade 10A as a whole of Weight reduction is ensured. A pair of minute holes 10H formed on the left and right sides of the regular hexagonal hole portion 10C are reference holes 10H that determine the position of the spacer 9A and the mounting phase of the rotary blade 10A to the rotary shaft 8A.

[0037] When viewed in the direction of the rotation axis, the base portion 10D has three peaks 10F and three valleys 10G alternately formed at equal intervals along the circumferential direction, and an acute-angled hook portion 10I is formed between each peak 10F and each valley 10G. The angle between the hook portion 10I and the valley 10G is set to be approximately a right angle.

[0038] As the rotary blade 10A rotates, the material to be treated is caught by the hook portion 10I and caught in the valley portion 10G, whereby the material to be treated is crushed.

[0039] It is possible for there to be a small area on part of the outer peripheral edge of the base 10D where the blade portion 10E is not present, but such an area must be limited to at least the valley portion 10G, which does not substantially contribute to crushing, and each peak 10F and hook portion 10I must be covered by the blade portion 10E.

[0040] [Rotary blade arrangement] The rotary blades 10A and 10B are fixed to the rotary shafts 8A and 8B so that the respective apexes 10F are positioned randomly in the axial direction of the rotary shafts 8A and 8B. If the tips 10F of the rotary blades 10A, 10B provided on the rotary shafts 8A, 8B are aligned in the axial direction of the rotary shafts 8A, 8B, large objects to be processed will dance above the rotary blades 10A, 10B, making efficient crushing difficult. Also, if the tips 10F are arranged spirally in the axial direction of the rotary shafts 8A, 8B, there is a risk that long objects will slip through along the spirally arranged tips 10F.

[0041] As shown in Figures 6(a) and (b), each of the rotary blades 10A and 10B includes a first type of rotary blade in which a virtual line passing through a pair of reference holes 10H is positioned at the center of one apex 10F and a valley 10G opposite the apex 10F, and a second type of rotary blade in which one apex 10F is inclined at an angle θ = 30° with the virtual line relative to the first type of rotary blade.

[0042] With each of the rotary blades of the first and second embodiments, the mounting angle to the rotary shaft can be made to differ in increments of 60°, but by combining each of the rotary blades of the first and second embodiments, the mounting angle to the rotary shaft can be made to differ in increments of 30°, and by combining these, the tops 10F of each rotary blade can be adjusted to be positioned randomly in the axial direction of the rotary shafts 8A and 8B.

[0043] As described above, the rotary blade according to the present invention has the first to sixth characteristic configurations. First, the rotary blade has a base portion fixed to a rotary shaft and a blade portion disposed on the outer peripheral edge of the base portion, and is configured so that the length of the base portion along the rotary shaft is shorter than the length of the blade portion along the rotary shaft.

[0044] Second, the blade portion extends so as to protrude in both directions along the rotation axis beyond the base portion. Third, the blade portion is arranged around the entire circumference of the outer peripheral edge of the base portion. Fourth, both the base portion and the blade portion are formed as plate-like bodies, and the thickness of the blade portion is thinner than the thickness of the base portion, and the length of the blade portion along the rotation axis is constant. Fifth, the blade portion is formed as a plurality of plate-like bodies and is fixed to the outer peripheral edge of the base portion by welding. Sixth, when viewed in the rotation axis direction, the base portion has three peaks and valleys alternately formed at equal intervals along the circumferential direction, and acute-angle hook portions are formed between each peak and valley.

[0045] The rotary blade according to the present invention may have the first characteristic feature described above and any one of the second to sixth characteristic features, or may have all or a combination of a plurality of the characteristic features.

[0046] As shown in Figure 2(a), the fixed blades 11A and 11B also have a base 11D and a blade 11E, and a pair of blades 11E made of wear-resistant steel plates are fixed by welding to both sides of the base 11D along the X-axis direction, the base 11D having a rectangular cross section and made of general structural rolled steel SS.

[0047] The rotary blades described above are used in a two-shaft rotary crusher, but they can also be used in crushers other than the two-shaft rotary crusher, such as a single-shaft rotary crusher.

[0048] The above-described embodiments are all examples of the present invention, and the present invention is not limited to these descriptions. It goes without saying that the specific configuration of each part can be appropriately modified and designed within the scope of the effects of the present invention. [Explanation of symbols]

[0049] 1: Two-axis rotary crusher 2: Hopper section 3: Crushing section 8A, 8B: Rotating shaft 9A, 9B: Spacer 10A, 10B: Rotary blade 10C: Hole 10D: Base 10E: Blade part 10F: Top 10G: Tanibe 10H: Reference hole 10I: Hook part

Claims

1. A rotary blade attached to a rotatable rotary shaft for crushing an object to be processed, a base portion fixed to the rotary shaft; and a blade portion disposed on an outer peripheral edge of the base portion, The blade portion is configured by arranging a plurality of plate-shaped bodies around the entire outer peripheral edge of the base portion, and is fixed to the outer peripheral edge of the base portion by welding, A rotary blade configured so that the length of the base in the direction along the rotation axis is shorter than the length of the blade portion in the direction along the rotation axis, and so that the blade portion protrudes beyond the base in both directions along the rotation axis.

2. 2. The rotary blade according to claim 1, wherein the base and the blade are both formed as plate-like bodies, the thickness of the blade is thinner than the thickness of the base, and the length of the blade in the direction along the rotation axis is constant.

3. 2. The rotary blade according to claim 1, wherein, when viewed in the direction of the rotation axis, the base portion has three peaks and valleys alternately formed at equal intervals along the circumferential direction, and acute-angled hook portions are formed between each peak and each valley.

4. A twin-shaft rotary crusher, comprising a pair of parallel-arranged rotary shafts, each of which has a rotary blade according to any one of claims 1 to 3 disposed at a fixed interval along the respective rotary shaft so as to intersect with the rotary blade.

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