JP2006122798A - Crushing blade and crusher using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide crushing blades and a crusher providing crushed object with uniform particle size distribution and causing little powder. <P>SOLUTION: A claw drawing in a crushing object and a lot of crushing blades 28 are formed on a surface of the crushing roller 22 rotatably supported in a crushing vessel. A fixed blade member 32 is fixed at an obliquely upper part of the crushing roller 22. The crushing blades 28 are protrudedly formed with first grooves 26A formed in parallel along the axis of the crushing roller 22, and second grooves 26B formed in parallel in the circumferential direction. Dimensions and forms of the first grooves 26A and second grooves 26B are set so as to prevent finally produced crushed objects from exceeding a given length, regardless of the intruding direction of the crushing object into the spaces among the crushing blades 28, therefore, the particle size quality increases and powder generation is reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a crushing blade (or crushing blade) and a crushing device (or crushing device) using the crushing blade, and more specifically to uniformizing the particle size of a crushing product (crushing product).

At the time of molding a plastic product, the route for injecting the molten resin material into the mold is also solidified and taken out and separated from the product. The solidified portion of this path is called a sprue runner, and after being pulverized by a pulverizer or the like, it is mixed into virgin pellets and reused as a recycled material. Referring to FIG. 3, the mechanism of a conventional crushing apparatus will be described. A number of crushing blades 102 are provided on the surface of a crushing roller 100 rotatably supported in a crushing tank. FIG. 3A is an enlarged view showing the structure of the grinding blade 102 of the grinding roller 100, and FIG. 3B is a cross-sectional view of the grinding roller 100. As shown in these drawings, the crushing blades 102 are provided in parallel in a plurality of rows in the axial direction of the drive shaft 100A, and the crushing blades 102 in one row have a predetermined distance from the crushing blades 102 adjacent in the axial direction. Formed. Then, the object to be crushed is pulverized between the pulverizing blade 102 and the fixed blade member 104 provided with the cutout blade portion 104A having a shape through which the row of the pulverizing blades 102 can pass. Between the rows of the crushing blades 102, an inclined surface 106 is provided to facilitate entry of an object to be crushed (for example, a sprue runner or the like). The guide plate 108 is for preventing the object to be crushed from falling. As such a conventional technique, for example, there is a fixed pulverizer shown in Patent Document 1 below.
Japanese Patent No. 3143451

  By the way, in order to accurately and smoothly supply, weigh, mix, etc. to the injection molding machine during reuse, (1) the size difference between the cut grains (pulverized products) There is no limit to the size of the virgin pellets, and (2) the quality of the particles is low. Therefore, the model of the pulverizing blade can be the performance and accuracy of the pulverizer itself, and is important for stabilizing the supply to the injection molding machine, the measurement time during measurement, and the measurement and mixing accuracy.

  Usually, the size of the crushing blade 102 is specified from the thickness of the sprue / runner, the specification of the equipment used (the diameter of the screw) at the time of reuse, and the like. However, there are many sprue runners that are thin like needles and long in the mold method. When the pulverization is to be performed with the conventional pulverization blade 102 as shown in FIG. 3, in addition to the pulverized product having a length corresponding to the axial width WX of the pulverization blade 102, adjacent rows of the pulverization blades 102 are arranged. A pulverized product having a length corresponding to the interval IY is also generated. Such a long pulverized product may impede stabilization of the supply to the injection molding machine, the measurement time during measurement, and the measurement and mixing accuracy. Further, since the long pulverized material passes through the fixed blade member 104 while being pushed into the space between the rows of the pulverizing blades 102, it becomes one of the factors that promote the generation of powder.

  The present invention pays attention to the above points, and its purpose is to perform pulverization so that the particle size of the pulverized product is uniform, that is, no pulverized product having a predetermined size or length is generated, A pulverizing blade capable of reducing generation of powder and a pulverizing apparatus using the same. Another object is to easily produce a grinding blade.

  In order to achieve the above object, the grinding blade of the present invention includes a first groove formed in parallel in the axial direction on the surface of the rotating roller and a second groove formed in parallel in the circumferential direction. A large number of convex substantially prismatic shapes are formed, and when the object to be pulverized, at least partially entering the first groove, is pulverized with a fixed blade member, the object to be pulverized has a predetermined length. The first and second grooves are formed so as to be crushed below.

  One of the main forms is an object to be crushed that has entered along the axial direction of the first groove, and an object to be crushed at least partly so as to protrude in the radial direction from the first groove. The first and second grooves are formed so as to be cut to substantially the same length. Another aspect is characterized in that the object to be crushed is plastic. Yet another embodiment is characterized in that the object to be crushed is a sprue runner.

  The pulverizing apparatus of the present invention includes a pulverizing tank into which an object to be pulverized is charged, a rotating roller supported substantially horizontally and rotatably in the pulverizing tank, a rotation driving mechanism for rotating the rotating roller, and a surface of the rotating roller. The pulverization blade according to any one of claims 1 to 4, which is fixed in the pulverization tank, has substantially the same shape as the row of pulverization blades in the axial direction of the rotating roller, and the pulverization blade passes therethrough. A fixed blade member in which a possible notch blade portion is formed, a fall prevention member provided in a position facing the fixed blade member in the crushing tank, and preventing the thrown object to be crushed from falling. It is characterized by having. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the present invention, by improving the size and shape of the grooves (spaces) between the pulverizing blades, the generation of pulverized material having a predetermined length or more is prevented, and the particle size quality is remarkably improved. Generation can be reduced. Further, by improving the shape of the grinding blade, it becomes easy to process the blade, and it is possible to obtain an effect that it can be manufactured with a general-purpose tool or general-purpose equipment.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing the overall configuration of the crushing apparatus of the present embodiment. 2A is a perspective view showing the structure of the pulverizing blade of this embodiment, and FIG. 2B is a cross-sectional view taken along the line # A- # A and viewed in the direction of the arrow. FIG. As shown in FIG. 1, in the crushing apparatus 10 of the present embodiment, a crushing tank 20 that crushes an object to be crushed such as a sprue runner 64 to a predetermined particle size (not enlarged or length) is supported by feet 12. A recovery container 46 for recovering the pulverized material after processing is provided below the pulverization tank 20. In addition, a hopper 56 having a charging port 58 for charging the sprue runner 64 and the like is provided above the crushing tank 20. The hopper 56 can be opened and closed with respect to the crushing tank 20, and can be fixed in a closed state by a metal fitting 62.

  A crushing roller 22 is rotatably supported between a pair of opposing side surfaces of the crushing tank 20 substantially horizontally. The other side of the crushing tank 20 has a fixed blade member 32 for crushing (or cutting) the sprue runner 64 by passing a crushing blade 28 provided on the crushing roller 22. It is fixed so as to form an inclined surface. Furthermore, a guide plate 38 for preventing the sprue runner 64 before pulverization from falling downward is fixed to the other side surface of the pulverization tank 20 so as to form an inclined surface. .

  On the surface of the crushing roller 22, there are provided claws 24 and a number of crushing blades 28. The claw 24 is for pulling in the sprue runner 64 that has been put in and crushing with the crushing blade 28, and is formed so as to protrude in the radial direction from the crushing blade 28. In addition, such a nail | claw 24 is well-known. Further, as shown in FIG. 2A, the crushing blade 28 includes a plurality of first grooves 26A formed in parallel on the surface of the crushing roller 22 along the axial direction of the crushing roller 22, and a circumferential direction. However, a plurality of discs on which the crushing blades 28 and the grooves 26A and 26B are formed may be overlapped with each other. Here, a plurality of crushing blades 28 arranged at predetermined intervals in the axial direction are referred to as crushing blade rows 29. The width WA of the crushing blade 28 in the axial direction is determined by the width of the second groove 26B, and the interval IB between the crushing blade rows 29 is determined by the width of the first groove 26A. The depth D of the pulverizing blade 28 is determined by the depths of the first and second grooves 26A and 26B. In the present embodiment, as will be described later, the shapes and dimensions of the grooves 26A and 26B are determined so that the final pulverized product has a substantially uniform particle size. The first groove 26A is formed in a substantially U shape that is slightly inclined, thereby forming the inclined surface 30 and allowing the sprue runner 64 to enter easily. Such a crushing roller 22 can be rotated by transmitting the rotation of a motor 52 provided outside the crushing tank 20 through a gear mechanism (or reduction gear) 54 and a drive shaft 50. . Note that the drive shaft 50 and the crushing roller 22 may be configured integrally.

  On the other hand, the fixed blade member 32 has a notch (not shown) for allowing the claw 24 to pass therethrough and a notch blade 36 for allowing the crushing blade 28 to pass when the crushing roller 22 rotates. Is provided. A guide groove 34 serving as a passage for the claw 24 that has passed through the notch of the fixed blade member 32 is provided in the crushing tank 20 (see FIG. 1). The notch blade portion 36 has substantially the same shape as the crushing blade row 29 and is set to a size that allows the crushing blade 28 to pass therethrough. For this reason, when the crushing roller 22 is rotated, the sprue runner 64 drawn by the claw 24 is pushed into the notch blade portion 36 by the crushing blade 28 and cut. The crushed material that has been cut passes from the back side of the fixed blade member 32 through the collection port 48 provided below the pulverization tank 20 and is collected in the collection container 46. Such a fixed blade member 32 can be opened and closed by a lever 44. The guide plate 38 is basically configured in the same manner as the fixed blade member 32, and has a notch (not shown) for passing the claw 24 and a notch for allowing the grinding blade row 29 to pass. A portion 42 is formed and can be opened and closed by a lever (not shown). The material which comprises each part demonstrated above is well-known, You may make it use any of them.

  Next, the operation of this embodiment will be described. First, a power supply (not shown) is turned on, the motor 52 is driven to start the rotation of the crushing roller 22, and the sprue runner 64 that is the object to be crushed is fed from the charging port 58 of the hopper 56. The loaded sprue runner 64 is drawn by the claws 24 and at least a part of the sprue runners 64 enters between the multiple crushing blades 28. That is, at least a part of the sprue runner 64 enters the first groove 26A, the second groove 26B, or the intersection of the first and second grooves 26A and 26B. The sprue runner 64 that has entered between the crushing blades 28 is carried to the fixed blade member 32 by the rotation of the crushing roller 22, and is cut to a predetermined length when the crushing blades 28 pass through the notch blade portion 36. Is done.

  For example, as shown by a dotted line in FIG. 2 (A), when the sprue runner 64 enters along the first groove 26A, it is cut to a length corresponding to the width WA of the grinding blade 28, As shown by a dotted line in FIG. 2B, when a part enters between the pulverizing blades 28 so as to protrude in the radial direction, it is cut to a length corresponding to the interval IB. Therefore, by setting the shapes and dimensions of the grooves 26A and 26B so that the lengths of the interval IB and the width WA are substantially equal, the sprue runner 64 can be inserted in any direction. A pulverized product which does not exceed the length (in the present embodiment, the interval IB) can be formed. In this embodiment, for example, the interval IB and the width WA are set to be about 4 mm, but may be changed as necessary.

  Then, the crushed or cut pulverized product is collected from the back side of the fixed blade member 32 to a collection container 46 provided below the pulverization tank 20, and sent to a molding machine or the like by appropriate means as necessary. Used. On the other hand, the object to be crushed remaining in the crushing tank 20 is eventually cut by the continued rotation of the crushing roller 22 and finally collected in the collection container 46. The guide plate 38 prevents the sprue runner 64 before being crushed from falling as described above.

Thus, according to the first embodiment, there are the following effects.
(1) By improving the size and shape of the grooves 26A and 26B between the pulverizing blades 28, the generation of pulverized material of a predetermined length or more is prevented, the particle size quality is remarkably improved, and the generation of powder is reduced. Can be reduced.
(2) Since the crushing blade 28 can be formed by the substantially U-shaped grooves 26A and 26B, a special cutting tool for forming a blade portion as in the prior art is not necessary and can be used for general purposes, which makes it easy to manufacture. For this reason, it is possible to shorten the processing steps of the crushing blade 28 and reduce the manufacturing cost.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shape and size of each part shown in the above-described embodiment is an example, and can be appropriately changed as necessary. In particular, the design of the grooves 26A and 26B can be changed according to the particle size (size / length) required for the pulverized product. For example, in the above-described embodiment, the width WA and the interval IB of the pulverizing blade 28 are set to be substantially equal. However, each part is considered in consideration of the shape of the object to be pulverized and how to enter between the pulverizing blades. The shape / dimensions may be determined.
(2) The configuration of the pulverizing apparatus 10 of the above embodiment is also an example, and a transportation means for transporting the recovered pulverized material may be connected to the recovery container 46.
(3) The rotational drive mechanism of the crushing roller 22 is also an example, and the design can be changed as appropriate so as to achieve the same effect.
(4) The above-described operation is also an example, and may be changed as appropriate to achieve the same effect.
(5) In the present embodiment, the sprue runner 64 has been described as an example of the object to be crushed, but this does not preclude application to pulverization of other various plastic materials, for example, molding defects. .

  According to the present invention, by improving the size and shape of the grooves (spaces) between the pulverizing blades, the generation of pulverized material having a predetermined length or more is prevented to improve the particle size quality, and the generation of powder is prevented. Since it is reduced, it can be applied to the use of a pulverizer. In particular, it is suitable for the use of a crusher for reusing plastic waste materials such as sprue runners.

It is a perspective view which shows the whole structure of Example 1 of this invention. It is a figure which shows the structure of the grinding | pulverization roller of the said Example 1, (A) is a perspective view, (B) is sectional drawing which cut | disconnected said (A) along the # A- # A line and looked at the arrow direction. is there. It is a figure which shows an example of background art.

Explanation of symbols

10: Crushing device 12: Foot 20: Crushing tank 22: Crushing roller 24: Claw 26A, 26B: Groove 28: Crushing blade 29: Crushing blade row 30: Inclined surface 32: Fixed blade member 34: Guide groove 36: Notch blade Portion 38: Guide plate 42: Notch 44: Lever 46: Recovery container 48: Recovery port 50: Drive shaft 52: Motor 54: Gear mechanism (or reduction gear)
56: Hopper 58: Loading port 62: Metal fitting 64: Sprue runner 100: Crushing roller 100A: Drive shaft 102: Crushing blade 104: Fixed blade member 104A: Notch blade portion 106: Inclined surface 108: Guide plate

Claims (5)

On the surface of the rotating roller, a plurality of first grooves formed in parallel in the axial direction and a plurality of second grooves formed in parallel in the circumferential direction are formed in a number of convex substantially prismatic shapes,
When pulverizing an object to be pulverized at least partially in the first groove with a fixed blade member, the pulverized object is pulverized to a predetermined length or less so as to be pulverized. A crushing blade, wherein two grooves are formed.   The object to be crushed that has entered along the axial direction of the first groove and the object to be crushed at least partly so as to protrude in the radial direction from the first groove are cut into substantially the same length. The crushing blade according to claim 1, wherein the first and second grooves are formed.   The pulverization blade according to claim 1, wherein the object to be pulverized is plastic.   The pulverization blade according to claim 3, wherein the object to be pulverized is a sprue runner. A crushing tank into which an object to be crushed is charged,
A rotating roller supported substantially horizontally and rotatably in the crushing tank;
A rotation drive mechanism for rotating the rotating roller;
The pulverizing blade according to any one of claims 1 to 4, formed on a surface of the rotating roller,
A fixed blade member that is fixed in the crushing tank, has substantially the same shape as the row of crushing blades in the axial direction of the rotating roller, and has a notch blade portion through which the crushing blade can pass;
In the pulverization tank, provided at a position facing the fixed blade member, a fall preventing member for preventing the crushed object to fall,
A crusher characterized by comprising:

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