JPH08640U - Cutting blade for shredder - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shredder in which the work of replacing a worn cutting blade for a shredder is labor-saving and the impact force transmitted from the blade tip is securely supported by the mounting base. A cutting blade 10 mounted on a shaft 1 rotatably supported by a casing is divided and formed by a mounting base 14 part fitted to the shaft 1 and a cutting edge 13 part surrounding the mounting base 14, and the cutting edge 13 The portion is circumferentially divided into a plurality of cutting edge pieces 13a so as to include one claw 10a. Then, each of the blade tip pieces 13a is configured to be able to come into contact with and separate from the mounting base 14 by the bolts 16, and
The mounting base 14 is surrounded so as not to be exposed on the surface so that the mounting base is not worn. Further, a stepped tooth portion 14a that meshes with each cutting edge piece 13a is formed on the outer periphery of the mounting base 14 so as to project.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a cutting blade for a shredder that continuously crushes various solid processed materials by a shearing action. Specifically, the cutting blade mounted on a rotary shaft pivotally supported by a casing is attached to a mounting base. The present invention relates to a cutting blade for a shredder, which is formed by being divided into a part and a cutting edge part so that wear occurs only in the cutting edge part and can be easily replaced.

[0002]

[Prior art]

 Conventionally, there has been known a shearing type crusher that effectively utilizes shearing force to pulverize all solid processed materials such as plastic, wood chips, paper, metal, rubber, fiber and leather (for example, Jikho 55). -41309 gazette).

In this type of shearing type crusher (hereinafter, also referred to as shredder), two shafts are parallel to each other via a bearing in a casing having an inlet and an outlet for a processed material. The bearings are rotatably supported so as to face each other, and disc-shaped cutting blades, which are an integral body, are alternately arranged on each shaft with a spacer interposed therebetween. The cutting blades arranged alternately have the side surfaces on one side closely contacting each other, and the peripheral surfaces of the cutting blades partially overlap each other to form a so-called slit cutter. Further, a claw for drawing in the processed material is provided on the outer periphery of the cutting blade so as to partially project. When using the shredder, the pair of opposing cutting blades are driven to rotate inwardly toward each other, and the target treated article is loaded through the loading port at the top of the casing. Then, the claws of the cutting blades facing each other draw the processed material into the gap between the cutting blades, crush it by the shearing action of the slit cutter, and drop it from the discharge port.

[0004]

[Problems to be solved by the device]

 In this type of shredder, the cutting blade is functionally the most worn, and it is necessary to replace it with a new one after a certain period of use. Depending on the frequency of use and processed material, it may have to be replaced within a fairly short period of time.

However, since the disc-shaped cutting blade is an integral body, when replacing it, it is necessary to separate the casing and the bearing and then remove the cutting blade together with the spacer from the shaft. It is a complicated and time-consuming task. Moreover, since such a shredder is equipped with a considerable number of cutting blades, it requires a great deal of labor to replace it, and maintenance is not easy.

On the other hand, Japanese Utility Model Publication No. 57-31953 discloses a shredder in which a blade is divided in the circumferential direction. The blade is fixed to the base side with bolts. The boundary surface of each divided blade body is a vertical surface, and the vertical blades are in contact with each other to form an integrated cutting blade in the circumferential direction.

In such a configuration, since the divided blade bodies are arranged on the circumference, a gap easily occurs at the boundary surface due to an error. In this case, the force transmitted from the blade during crushing is less likely to be transmitted to the adjacent blade via this vertical boundary surface, so a bending moment acts on the bolt. Also, if there is a minute gap (backlash) on the boundary surface, the impact force during crushing will hit the boundary surface and cause damage.

The present invention has been made in view of the above problems of the prior art, and the cutting blade is divided into a portion of a mounting base for mounting a cutting blade on a shaft and a blade tip portion that is easily worn, and the blade tip portion is connected to the mounting base. We provide a shredder cutting blade that is configured to be separable, and that the stepped teeth on the mounting base engage the blade tip to ensure that the reaction force transmitted from the blade tip can be supported by the mounting base. The purpose is to do.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a cutting blade mounted on a shaft supported by a casing of a shredder with a spacer interposed therebetween, the cutting blade being attached to the shaft, and a cutting edge portion surrounding the mounting base. The blade tip portion is divided in the circumferential direction to form a plurality of blade tip pieces in the circumferential direction, and each blade tip piece can be attached to and detached from the mounting base. In a shredder surrounded so that the outer periphery is not exposed on the surface, stepped tooth portions that engage with each blade tip are formed on the outer periphery of the mounting base in a protruding manner.

[0010]

[Action]

 In the above configuration, since the mounting part is surrounded by the cutting edge part so as not to be exposed on the surface, it is protected from wear when crushing the processed material, and only the cutting edge part wears during use. Become. When replacing the cutting edge portion, it suffices to remove the circumferentially divided cutting edge pieces individually from the mounting base. Then, the new cutting edge is joined and fastened to the mounting base with bolts or the like, and integrated as a cutting blade. With the cutting blade having such a configuration, the cutting edge can be easily replaced by replacing only the worn cutting edge portion of the cutting blade without removing the casing or the bearing.

Moreover, since the stepped tooth portion is formed on the outer periphery of the mounting base so as to mesh with each blade tip piece, the axial toothed force is reliably transmitted to the blade tip portion by the stepped tooth portion. The reaction force transmitted through the cutting edge piece at the time of crush cutting is supported by the mounting base through the stepped tooth portion.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

First, the overall structure of the shredder equipped with the cutting blade according to the present invention will be described. 4 is a plan sectional view of the entire shredder, FIG. 5 is a sectional view of the same side, and FIG. 6 is a sectional view taken along line XX of FIG.

In these figures, a main shaft 1 and a slave shaft 2, which are two rotary shafts having a rectangular cross section, are arranged in parallel at regular intervals, and both shaft ends of the shafts 1 and 2 are bearings. It is rotatably supported by a box-shaped casing 4 via 3. A shaft 1a connected to the main shaft 1 is connected to a drive shaft 7 of an electric motor 6 via a joint 5. A spur gear 8 is mounted on a shaft 1a connected to the main shaft 1 and meshes with a spur gear 9 provided at one end of the slave shaft 2. Therefore, when the motor 6 is driven to rotate the main shaft 1 counterclockwise, the slave shaft 2 rotates in the opposite right direction, that is, the two shafts 1 and 2 move inward (see FIG. 6). It is configured to rotate oppositely (in the direction of the arrow).

On the two parallel axes 1 and 2, disc-shaped cutting blades 10 having a configuration described later are alternately sandwiched with a spacer 11 in close contact, and their side surfaces are closely overlapped with each other. It is fitted and installed in the state of being. A plurality of claws 10a (see cutting blade 10 in FIG. 6) for drawing in the processed material and for cutting are provided on the outer periphery of each cutting blade 10 at regular intervals. At the same time as the claw 10a pulls in the object to be processed when the cutting blade 10 rotates, the claw 10a comes close enough to make sliding contact with the outer peripheral surface of the opposing spacer 11 (the gap at the time of approaching is set to about 0.5 to 1 mm) and is sheared. It acts to break the processed material into a certain length (length corresponding to the distance between the claws 10a). The side faces of the pair of cutting blades 10 facing each other are always closely wrapped to form a slit cutter, and the processed material introduced from above the casing 4 is drawn in by the claw 10a, and by the shearing action of the slit cutter. It is crushed and discharged downward.

A scraper 12 is provided so as to project from the side of the box-shaped casing 4 at a position facing the cutting blade 10 and the spacer 11, and the tip ends of the scraper 12 (tip of the claw 10 a) and the spacer 11 respectively. Is formed in a semi-circular shape so as to be close to the peripheral surface of the.

The scraper 12 has a function of scraping off a processing object sandwiched between the cutting blades 10.

By the way, in the case of the cutting blade 10 having the above-mentioned function, the blade tip portion of the outer periphery and especially the portion of the claw 10a are easily worn, and it is necessary to replace it with a new one if it is used for a certain period. As described above, if the cutting blade 10 is an integral body, it cannot be easily replaced.

Therefore, the cutting blade 10 according to the present invention is configured as shown in FIG. That is, as shown in FIG. 1, the cutting blade 10 is divided and formed into a portion of a mounting base 14 fitted to the shafts 1 and 2 having a rectangular cross section and a portion of a cutting edge 13 surrounding the mounting base 14. The cutting edge 13 and the mounting base 14 can be contacted and separated (detachable) as described later. Moreover, the part of the cutting edge 13 is divided into several parts in the circumferential direction. That is, the cutting edge 13 is formed by joining and joining several substantially hook-shaped cutting edge pieces 13a including one claw 10a in the circumferential direction.

The joint boundary surface C between the cutting edge 13 and the mounting base 14 is not exposed on the surface, that is, the joint boundary surface C is completely surrounded by the cutting edge piece 13a so that the entire outer periphery of the mounting base 14 is not exposed on the surface. Has been done. As a result, wear occurs only on the cutting edge 13 and not on the mounting base 14. Thus, since the portion of the mounting base 14 is protected by the portion of the cutting edge 13 and is not worn, replacement can be performed only at the cutting edge 13 portion. It should be noted that stepped tooth portions 14a are formed on the outer periphery of the mounting base 14 so as to mesh with the respective cutting edge pieces 13a, and this stepped tooth portion 14a ensures that the axial rotational force can be transmitted to the cutting edge 13 portion. In addition, the tooth portion 14a takes charge of the reaction force at the time of cutting.

A bolt hole 15 is formed in each cutting edge piece 13 a, and a bolt 16 is inserted into this bolt hole 15 and screwed into a female screw hole 17 formed on the mounting base 14 side. The piece 13a is integrally attached to the outer periphery of the mounting base 14 so as to be able to come into contact with and separate from (attach and detach), so that one cutting blade 10 is formed.

FIG. 2 shows the relationship between the size of the spacer 11 and the mounting base 14 which are tightly sandwiched on both sides of the cutting blade 10. That is, the outer diameter D of the spacer 11 is formed so as to be larger than the outer diameter d of the mounting base 14 (D> d). As a result, as shown in FIG. The hatched portion 11a (excluding the stepped tooth portion 14a) is configured to protrude from the outer shape of the mounting base 14. By doing so, each blade tip 13a joined to the outer peripheral surface of the mounting base 14 is sandwiched by the protruding portions (hatched portions in the figure) 11a of the spacers 11 on both sides, and the position in the width direction is displaced. It will be fixed so that it does not exist. Thus, each cutting edge piece 13a is fixed by the bolt 16 in the direction perpendicular to the shaft 1 as described above, and is clamped in the axial direction (that is, the width direction of the cutting edge) by the protruding portion of the spacer 11 that is closely attached to both sides of the cutting edge piece 13a. Since it is fixed, it does not rattle even if it is used for a long time, and it does not hinder its retracting and breaking functions.

Therefore, when exchanging the worn edge portion 13, it is sufficient to simply remove the fastening bolt 16 and remove the edge piece 13a from the mounting base 14. As in the conventional case, the casing and the bearing are separated. It is not necessary to pull out the entire cutting blade from the rear shaft. Also, the blade piece 13a can be easily attached to the mounting base 14. Since such shredders are usually equipped with a considerable number of cutting blades, the replacement work will be significantly labor-saving when this proposal is adopted.

On the other hand, in the structure of the shredder, not only the cutting blade 10 but also the outer peripheral surface of the spacer 11 is easily worn. Therefore, the spacer 11 is also divided into two parts as shown in FIG. The joint surface is fastened with a bolt 18 using a notch 19 formed on the outer peripheral surface of the spacer 11. By removing the bolt 18, the spacer 11 can be easily removed from the shafts 1 and 2, and the replacement thereof becomes easy.

[0025]

[Effect of device]

 The cutting blade according to the present invention described above is divided and formed by the portion of the mounting base fitted to the shaft and the cutting edge portion surrounding it, and the cutting edge is also divided in the circumferential direction and formed by several cutting edge pieces. Since each blade piece is configured to be attachable to and detachable from the mounting base, only the blade edge is worn by use, which greatly reduces labor for replacement work and makes maintenance very easy. By forming a stepped tooth on the outer periphery of the blade so that it meshes with each blade, the stepped tooth can reliably transmit the shaft rotation force to the blade, and at the same time, it can be transmitted from the blade during crush cutting. The incoming reaction force can be reliably supported by the mounting base via the stepped tooth portion.

[Brief description of drawings]

FIG. 1 is a front view showing a part of a cutting blade according to an embodiment of the present invention.

FIG. 2 is a front view showing a size relationship between a mounting base that constitutes a cutting blade and a spacer that is in close contact with the mounting base.

FIG. 3 is a cross-sectional view of a spacer.

FIG. 4 is a plan sectional view showing the overall structure of a shredder equipped with a cutting blade according to the present invention.

FIG. 5 is a side sectional view of the same.

6 is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... (Main) shaft 2 ... (Slave) shaft 4 ... Casing 6 ... Electric motor 8, 9 ... Spur gear 10 ... Cutting blade 10a ... Claw 11 ... Spacer 11a ... Overhanging portion 12 ... Scraper 13 ... Blade tip 13a ... Blade tip piece 14 ... Mounting base 14a ... Stepped tooth

Claims (1)

[Scope of utility model registration request] 1. A cutting blade is mounted on a shaft axially supported by a casing of a shredder with a spacer interposed therebetween, and the cutting blade is divided into a mounting base portion fitted to the shaft and a cutting edge portion surrounding the mounting base portion. Moreover, this blade tip portion is divided in the circumferential direction and formed by a plurality of blade tip pieces, and each blade tip piece is configured to be able to come into contact with and separate from the mounting base, and the outer periphery of the mounting base is exposed on the surface at the blade tip portion. A cutting blade for a shredder, characterized in that a stepped tooth portion that meshes with each blade tip is formed on the outer periphery of the mounting base so as not to surround the shredder.