JPH0143174Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention enables cutting pieces such as chips to be separated with high accuracy, and also strengthens the strength of the cut portion of the spacer with a simple configuration. Concerning the structure of the cutter and spacer in the chip crusher.

(Prior art) For example, chips emitted from machine tools scatter around the area, deteriorating the working environment, and requiring workers to clean regularly, which impairs work safety and efficiency. In addition, these types of chips are generally sharp and long, making cleaning and disposal difficult, and improvements have long been desired.

For this reason, the applicant has developed a cutting device that can be installed, for example, at the discharge end of a chip conveyor of a machine tool to divide the chips discharged from the machine tool and process them in a compact manner. Utsukai Showa 61-
It has already been proposed as Publication No. 50640.

That is, this already proposed cutting device has a cutter shaft that can rotate integrally with the drive shaft of the motor, and a cutter shaft that can rotate in the opposite direction to the shaft, installed in parallel to each other, and a large number of It was constructed by alternately interlocking stubs and spacers.

(Problem that the invention aims to solve) However, in this cutting device, since the circumferential surface of the spacer facing the cutter is composed of a smooth surface, when the cutting edge of the cutter approaches the circumferential surface of the spacer, it is inserted vertically. There was a problem in that the cut chips passed between them without being cut.

As a means of solving this problem, it is conceivable to provide a suitable cut portion also on the circumferential surface of the spacer, and such proposals have been made in the past. For example, Japanese Utility Model Publication No. 53-44134 discloses a pulverizer in which a plurality of crushing blades made of cemented carbide are attached to the circumferential surface of a spacer, and Japanese Utility Model Publication No. 16060/1980 discloses a pulverizer in which a plurality of crushing blades made of cemented carbide are attached to the circumferential surface of a spacer. A pulverizer configured in the following manner is disclosed.

However, with these spacers, for example, in the former case, a crushing blade and its installation are required, which increases the cost of the spacer, and in addition, the crushing blade is prone to breakage due to impact, and in the latter case, the cutting blade is easily damaged. Since the length of the cutter is high and the cutting edge is not sharp, there are problems in that the cutter part is easily broken and has poor sharpness, so it cannot be used for cutting metal pieces such as chips.

In view of these points, the present invention prevents the pieces to be cut from passing between the cutter and the spacer, making it possible to divide the pieces with high accuracy.It also has a simple structure that allows the spacer to have a sharp cutting edge and a strong cutting edge. It is an object of the present invention to provide a structure of a cutter and a spacer in a chip crusher which can obtain strength.

(Means for solving the problem) Therefore, the structure of the cutter and spacer in the chip crusher of the present invention includes a pair of rotatable cutter shafts installed parallel to each other and spaced apart from each other. In the structure of the cutters and spacers in the chip crusher, in which cutters and spacers are arranged alternately on the cutter shaft, and the outer peripheral surfaces of these cutters and spacers are arranged facing each other between both cutter shafts, the spacers are arranged in the shape of a regular polygon. The tip-shaped cut portion formed at the top of each cut portion is arranged closely on the circumferential surface of the opposing cutter, thereby simplifying the structure of the spacer and making it easier to manufacture. This feature is characterized in that the cut pieces passing through are cut to prevent them from passing through.

(Embodiment) Hereinafter, an illustrated embodiment in which the present invention is applied to a chip cutting device will be explained. In FIGS. 1 to 3, 1 is a cutting device, and for example, a chip conveyor attached to a machine tool (not shown) is used. It is installed at the discharge end and has a rectangular cutter frame 2 cast as its outer casing. cutter frame 2
A pair of cutter shafts 3 and 4 made of, for example, spline shafts are installed in parallel inside the frame 2, and both ends of the cutter shafts are rotatably supported via bearings (not shown) embedded in the frame 2. There is.

A plurality of cutters 5, 5 and a spacer 6 are attached to the cutter shafts 3, 4 in an alternate spline-fitted manner, and these cutters 5, 5 are arranged in close and meshing relationship with each other, and the cutting edge surfaces of the cutters 5, 5 and spacers 6 are arranged in a close and meshing manner with each other. It is closely disposed opposite to the outer peripheral surface of 6.

Cutters 5 and 5 have cutter shafts 3 and 4 in the center.
It has a spline hole into which it can be fitted, and has a plurality of serrated cutting blades 7 on its outer peripheral surface. The spacer 6 is made of a regular octagonal plate having a smaller diameter than the cutters 5, 5, and has a spline hole in the center thereof into which the cutter shafts 3, 4 can be fitted.

A plurality of cutter portions 6a constituted by the above-mentioned regular octagonal tops are provided on the circumferential surface of the spacer 6, and the cutter portions 6a have sharp pointed cutting edges as shown in FIG. Between these adjacent cutter parts 6a, 6a is a smooth cutter peripheral surface part 6b.
The cutting edge is formed in a straight line, and the blade base is widened in the direction of the adjacent cutter portions 6a, 6a, and the blade length is short and small.

The cutter shafts 3 and 4 protruding outward from the cutter frame 2 have gears 8 and 9 that can mesh with each other.
are fixed, making the cutter shafts 3 and 4 rotatable in mutually opposite directions. In addition, a motor bucket 1 is attached to the outer end surface of the cutter frame 2.
0 is fixed at one end, and a reducer 12 integrated with a motor 11 is fixed at the other end. A coupling ring 14 is fixed to the output shaft 13 of the reducer 12, and the shaft end of the cutter shaft 3 is connected to the coupling ring 14.

In addition, 15 and 15 in the figure are cutter frames 2.
A scraper is fixed to face the inside of the scraper, and its upper surfaces 15a, 15a are formed as inclined surfaces that descend inwardly, and a plurality of grooves 16 are formed at the tip thereof,
The end portion has a substantially comb-like shape. The cutters 5, 5 are tightly housed in each of the grooves 16, and the tip surfaces of the scrapers 15, 15 are tightly arranged opposite to each spacer 6.

FIG. 4 shows main parts of another embodiment of the present invention, and the same reference numerals are used for parts corresponding to the above-mentioned configuration. In this embodiment, the spacer 6 is formed into a square plate instead of a regular octagon, and the cutting edge of the cutter part 6a is made even sharper, while the adjacent cutter part 6
a and 6a are spaced apart, and the distance between the axes of the cutter shafts 3 and 4 is slightly reduced, so that the rotation locus of the cutter portion 6a is drawn inside the rotation locus of the cutting blade 7 of the cutter 5. At the same time, by bringing the cutter portion 6a into contact with a fixed position on the back surface of each cutting blade 7, chips that have entered between the circumferential surfaces of the cutter 5 and the spacer 6 are cut, and the chips are removed from the back surface of the cutter portion 6a. In addition to highly accurate capture and reliable cutting, the cutting blade 7
It is characterized by avoiding contact between the cutter part 6a and the cutter part 6a, thereby preventing the blade from spilling on both parts.

In the above embodiments, the spacer 6 is formed into an equilateral octagon or a square, but it may also be formed into an equilateral triangle or a square.
It is also possible to form it into a regular pentagon, a regular hexagon, and other regular polygons.

(Function) When manufacturing the spacer 6 with the chip crusher configured as described above, it is sufficient to simply cut a commonly used thick carbon steel plate into a regular octagon and form a spline hole in the center. Since it is not necessary to attach a special cutter member such as a spacer or to process the blade shape, it is easy to process and can be manufactured at low cost.

The chip crusher assembled using the spacer 6 manufactured in this way is installed at the discharge end of a chip conveyor attached to a machine tool, for example, and when the motor 11 is started to cut the chips, its power is decelerated. The signal is transmitted from the machine 12 to the cutter shaft 3 via the output shaft 13 and the coupling ring 14, and the shaft 3 rotates. On the other hand, this power is applied to a gear 9 that meshes with a gear 8 fixed to the cutter shaft 3.
is transmitted to the other cutter shaft 4, which rotates in the opposite direction to the cutter shaft 3. That is, the cutter 5 and spacer 6 attached to these shafts 3 and 4 rotate in opposite directions.

When a machine tool starts cutting a metal member under these circumstances, the chips generated by the processing are conveyed to a chip conveyor (not shown) and fall into the cutting device 1 from its delivery end. Then, it is accommodated on the circumferential surfaces of the cutters 5, 5 and the spacer 6. In this case, even if some of the chips fall onto the scraper 15, they will fall onto the upper surface of the slope.
5a, and is received on the cutters 5, 5.

The chips thus stored along the axial direction on the circumferential surfaces of the cutters 5, 5 and spacers 6, 6 are rotated in the inner direction of the cutting device 1, in other words, in the direction in which the chips are rolled up. By doing so, Katsuta 5,5
is scraped into the meshing part of the cutter 5, and is rolled up into the cutters 5 through the gap formed between the back surface of the cutting blade 7 of the cutter 5 and the circumferential surface of the spacer 6, and the cutter 5
It is torn off and divided at the periphery of the spacer 6.

On the other hand, the chips 17 fed into the cutting device 1 almost vertically try to slip through the gaps formed intermittently between the opposing circumferential surfaces of the cutter 5 and the spacer 6 and fall without being cut. However, as shown in FIG. 3, it is caught between the cutting blade 7 of the cutter 5 and the cutter part 6a of the spacer 6, and is cut by the cutter part 6a while being pinched by these.

Therefore, unlike the conventional case in which the circumferential surface of the spacer 6 is a smooth surface, the cutting blade 7 is cut into chips 1.
This eliminates the situation in which the chips 17 are allowed to pass through without causing cutting by simply rubbing against the chips 7, and the chips 17 can be reliably separated.

When the chips 17 are cut in this way, the cutting blade 7 and the cutter portion 6a that were holding the chips 17 are rotated downward, and a gap is formed between the back surface of the cutting blade 7 and the cutter peripheral surface portion 6b. , the divided chips 17 fall through this gap. Therefore, galling of the chips 17 in this gap is prevented, and the motor 1
1 is avoided. Moreover, when the spacer 6 is configured to have a regular octagonal shape as in the embodiment, the vertical distance from the locus circle of the cutter part 6a to the cutter peripheral surface part 6b is short, so the above-mentioned gap prevents the passage of the cutting chips 17 after separation. The span is as large as the allowable length, and serves to prevent long uncut chips from passing through.

Even when the chips 17 are cut by the cutter part 6a in this way, the blade base of the cutter part 6a expands in the direction of the adjacent cutter part 6a and is formed wide, and the blade of the cutter part 6a Since the length is extremely low as described above, it can sufficiently withstand the force acting on the cutter part 6a during cutting, and will not break or chip the blade.

(Effect of the invention) As described above, the structure of the cutter and spacer in the chip crusher of the present invention includes a pair of rotatable cutter shafts installed parallel to each other apart from each other, In a structure of cutters and spacers in a chip crusher in which the cutters and spacers are arranged alternately and the outer peripheral surfaces of these cutters and spacers are arranged facing each other between both cutter shafts, the spacers are formed into regular polygons, Since the tip-shaped cut portions formed at the tops of the spacers are arranged in close contact with the circumferential surfaces of the opposing cutlets, the structure of the spacer is simplified and can be manufactured easily. By arranging it closely to the surface, it is possible to cut the cut pieces that pass between the two, and prevent the cut pieces from passing through, which occurs with conventional spacers having a smooth circumferential surface. This has the effect of allowing the pieces to be cut to be divided with high accuracy.

In addition, since the spacer of the present invention has a cut portion at each top of the regular polygon, it is possible to secure a wide blade base and reduce the length of the blade, which strengthens the strength of the cut portion and prevents breakage and blade spills. It has a practical effect of preventing this.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a sectional view taken along the line A-A' in Figure 1, Figure 3 is a front view showing the situation during cutting according to the present invention, and Figure 4 is a main part of another embodiment of the present invention. It is a front view. 3, 4... cutter shaft, 5... cutter,
6...Spacer, 6a...Cut portion.

Claims (1)

[Scope of utility model registration request] A pair of rotatable cutter shafts installed in parallel apart from each other is provided, cutters and spacers are arranged alternately on these cutter shafts, and the outer peripheral surfaces of these cutters and spacers are oriented between both cutter shafts. In the structure of the cutter and spacer in the chip crusher arranged together, the spacer is formed into a regular polygon, and the tip-shaped cutter portion formed at each top of the spacer is arranged so as to be close to the circumferential surface of the opposing cutter. The structure of the cutter and spacer in the chip crusher is characterized by the following.