JPH04154Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the improvement of a cutter drum device used in civil engineering and mining operations such as drilling tunnels and excavating rocks.

(Prior Art) Conventionally, methods for attaching a bit to a bit holder in a cutter drum device include, for example, drilling coaxial holes in the bit and bit holder and inserting a pin into the hole, and screwing into a recess of the bit from the bit holder side. How to engage the tip of a bolt,
Alternatively, a method is known in which a rubber retaining piece is inserted between the recessed part of the bit and the recessed part of the bit holder.

(Problem to be solved by the invention) By the way, in this type of cutter drum device, cutting debris enters between the bit and the bit holder, and in this state, the entire bit is subjected to large impact force and vibration, and A cutting reaction force is applied to the cutting edge of the bit in the direction opposite to the direction of rotation. Therefore,
The bit and the bit holder that holds the bit so that it can be inserted must have durability, impact resistance, and abrasion resistance, and must be able to prevent rattling between the two, and it is also necessary to replace worn or broken bits. It must be possible to do this easily.

However, among the conventional techniques described above, the method of inserting a pin has the disadvantage that it has poor impact resistance and cannot prevent rattling. In addition, the second method of engaging the tip of the bolt has the disadvantage that the bolt loosens due to shock or vibration, and that it deforms and requires time and effort to replace the bit. Furthermore, the method of inserting a rubber retaining piece has the disadvantage that the retaining piece is easily deformed to receive cutting reaction force and is difficult to remove.

The present invention was developed in view of the above-mentioned drawbacks of the conventional technology, and as a result of being able to reliably prevent the bit from rattling, it has excellent durability, impact resistance, and abrasion resistance.
Moreover, the present invention provides a cutter drum device that allows bits to be easily exchanged.

(Means for Solving the Problems) The means of the present invention configured to solve the above-mentioned problems includes a rotatable cutter drum body, a bit holder provided on the front surface of the cutter drum body, and a cutter drum body that can be inserted into and removed from the bit holder. In a cutter drum device having a bit that can be inserted, the inside of the bit holder becomes a bit insertion part, the inner surface on the rear side in the rotational direction becomes a cutting reaction force receiving surface, and the upper end surface of the cutting reaction force receiving surface. A cylindrical holder body with a bit abutting surface, a fixed piece fitting surface formed diagonally upward on the upper part of the inner surface on the front side in the direction of rotation of the holder body, and a fixed piece fitting surface located below the fixed piece fitting surface. and a bit locking part recessed in the inner surface of the holder body, the lower side is a plate-shaped base that is removably inserted into the bit insertion part of the holder body, and the upper part is A bit body whose side protrudes outward from the bit insertion part and has a cutting part on the front upper part in the rotational direction, and a relief surface for insertion and removal formed as a diagonally downward slope on the rear lower part of the bit body in the rotational direction. an engaging step portion formed on the bit body above the insertion/removal flank and press-contacted to the bit contacting surface of the holder body; an engaging protrusion that protrudes and removably engages with the bit locking part of the holder body; and an engaging protrusion that is located between the engaging protrusion and the blade part and formed on the front side surface of the bit body in the rotational direction. The fixed piece engaging jaw is integrally formed with the bit holder and the bit inserted into the bit holder. The fixing piece is configured to be press-fitted.

(Function) The bit inserted into the bit holder is pressed against the cutting reaction force receiving surface of the bit holder by the elastic fixing piece, and the engaging protrusion engages with the bit locking part to prevent the bit from coming out. be done. Further, since the cutting reaction force is applied to the cutting reaction force receiving surface of the bit holder and does not act on the elastic fixing piece, the elastic fixing piece will not be deformed or deteriorated.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

In the figure, reference numeral 1 denotes a cutter drum body, and the cutter drum body 1 is rotatably driven in the direction of arrow A in the figure by a hydraulic motor (not shown). Reference numeral 2 indicates a bit holder erected on the front surface 1A of the cutter drum body 1. Reference numeral 3 denotes a cylindrical holder body forming the bit holder 2. The inside of the holder body 3 serves as a hollow cylindrical bit insertion portion 3A, and the inner surface on the rear side in the rotational direction serves as a cutting reaction force receiving surface 3B. The end surface above the cutting reaction force receiving surface 3B is a bit abutting surface 3C.

Reference numeral 4 indicates a fixed piece fitting surface formed at the upper part of the front inner surface of the holder main body 3 in the rotational direction, and the fixed piece fitting surface 4 is a diagonally upwardly inclined surface. On the other hand, reference numeral 5 denotes a bit locking portion located below the fixed piece fitting surface 4 and formed as an opening on the front inner surface of the holder body 3. In the embodiment, the bit locking portion 5 is formed from a hole formed through the machining process. However, it does not necessarily have to be penetrating, and may be formed in the shape of a groove.

Next, 6 indicates a bit that is removably inserted into the bit holder 2. Reference numeral 7 indicates a bit body constituting the bit 6, and the bit body 7 includes a plate-shaped base 7A inserted into the bit insertion portion 3A of the holder body 3, and a plate-like base portion 7A that protrudes outward from the bit insertion portion 3A and rotates in the rotation direction. It is integrally formed with a cutting part 7B in which a blade part 8 is provided at the upper front side.

Reference numeral 9 denotes a relief surface for insertion and removal formed at the rear lower part of the bit body 7 in the rotational direction, and the relief surface 9 for insertion and removal is shown in FIG. 2 when the bit body 7 is inserted into and removed from the bit holder 2. so that you can lean forward as if
It is formed on a diagonally downward slope. Also, 1
Reference numeral 0 indicates a downward engaging step portion located above the insertion/removal flank 9 and formed to protrude from the bit body 7, and the engaging step portion 10 is located above the bit contacting surface of the holder main body 3. It comes into contact with 3C.

On the other hand, reference numeral 11 denotes an engagement protrusion formed to protrude forward from the front lower part of the bit body 7 in the rotational direction, and the engagement protrusion 11 is adapted to be removably fitted into the bit locking part 5 of the bit holder 2. There is. Further, reference numeral 12 designates a fixed piece engaging jaw formed on the front side of the bit body 7 and located between the engaging protrusion 11 and the blade part 8, and the fixed piece engaging jaw 12 extends downward. The surface is curved.

Thus, the bit 6 of this embodiment has a bit main body 7 having a blade portion 8, a flank surface 9 for insertion and removal, and an engaging stepped portion 1.
0, it is integrally formed from an engaging protrusion 11 and a fixed piece engaging jaw 12.

Furthermore, 13 is a rubber fixing piece, and the fixing piece 13
are the bit holder pressure contact surface 13A and the bit pressure contact surface 1.
3B and a wedge-shaped engagement surface 13C.

This embodiment is constructed as described above, and how to use it will now be described with reference to FIG. 2.
First, when attaching the bit 6 to the bit holder 2, tilt the bit 6 forward so that the insertion/removal flank 9 is parallel to the cutting reaction force receiving surface 3B of the holder main body 3, and the engaging protrusion 11 is attached to the holder. Insert the base portion 7A of the bit 6 into the bit holder 3 in the direction of arrow B without getting caught on the inner surface of the bit insertion portion 3A of the main body 3. When the lower corner of the engaging protrusion 11 comes into contact with the front surface 1A of the cutter drum body 1, the bit 6 is raised perpendicularly to the cutter drum body 1. As a result, the engaging step portion 10 of the bit 6
comes into contact with the bit contacting surface 3C of the holder body 3, and the base 7A of the bit body 7 comes into contact with the cutting reaction force receiving surface 3B, while the engaging protrusion 11 is fitted into the bit locking part 5 and engaged. As a result, the bit 6 cannot escape while remaining perpendicular to the cutter drum body 1.

After that, the fixing piece 13 is press-fitted into the triangular space formed between the fixing piece fitting surface 4 of the bit holder 2 and the bit 6 to prevent the bit 6 from tilting forward for some reason. At the same time, the bit 6 is pressed against the cutting reaction force receiving surface 3B.

A cutting reaction force in the direction of arrow C acts on the blade portion 8 of the bit 6 assembled into the bit holder 2 as described above, but the cutting reaction force can be received only by the bit holder 2. There is no action on the fixing piece 13. Therefore, the fixing piece 13 does not deform or deteriorate due to strong pressing force or impact, so the bit 6 can be tightly pressed against the bit holder 2 along the cutting reaction force C, and the bit will not be inserted into the bit insertion part 3A. As a result of preventing the intrusion of cutting debris, it is possible to create a cutter drum device that is free from rattling and has excellent durability, impact resistance, and abrasion resistance.

On the other hand, when replacing bit 6, fixing piece 1
After breaking down the bit 3 with a sharp tool such as a cutter and removing it, the bit 6 can be replaced by simply pulling up the bit 6 in the direction of arrow D in the reverse order of insertion.

Although the fixing piece 13 made of rubber is used as an example in this embodiment, it is also possible to form the fixing piece with a known elastic material made of synthetic resin other than rubber.

(Effects of the invention) The present invention, as detailed above, is designed to prevent the bit from coming off only by the engagement force between the bit and the bit holder, and to absorb the cutting reaction force applied to the bit only by the bit holder. The elastic fixing piece only has the function of preventing the bit from tilting forward and pressing the bit, thereby preventing deformation and deterioration of the elastic fixing piece.Therefore, there is no wobbling and therefore durability. It is possible to provide a cutter drum device with excellent impact resistance and abrasion resistance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a cutter drum device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of inserting and removing a bit into a bit holder. 1... Katsuta drum body, 2... Bit holder, 3... Holder body, 4... Fixed piece fitting surface, 5
... Bit locking part, 6 ... Bit, 7 ... Bit body, 8 ... Blade section, 9 ... Relief surface for insertion and removal, 10 ...
...Engaging step portion, 11... Engaging protrusion, 12... Fixed piece engaging jaw, 13... Elastic fixing piece.

Claims (1)

[Scope of utility model registration request] A cutter drum device has a rotatable cutter drum body, a bit holder provided on the front surface of the cutter drum body, and a bit that is removably inserted into the bit holder. A cylindrical holder body whose rear inner surface in the direction serves as a cutting reaction force receiving surface and the upper end surface of the cutting reaction force receiving surface serves as a bit abutting surface, and an upper part of the front inner surface in the rotational direction of the holder body. The holder is integrally constructed of a fixed piece fitting surface formed diagonally upward and a bit locking part located below the fixed piece fitting surface and recessed in the inner surface of the holder body, and the bit is A bit body having a plate-shaped base that is removably inserted into the bit insertion portion of the holder body, an upper side protruding outward from the bit insertion portion, and a cutting portion having a blade portion at the upper front side in the rotational direction. , an insertion/removal relief surface formed as a diagonally downward inclined surface at the rear lower part of the bit body in the rotational direction; an engagement step portion that presses against the contact surface; an engagement protrusion that protrudes forward from the lower front side of the bit body in the rotational direction and removably engages with the bit locking portion of the holder body;
A fixed piece engaging jaw portion located between the engaging protrusion and the blade portion and formed on the front side surface of the bit body in the rotational direction is integrally formed with the bit holder and the bit inserted into the bit holder. The cutter drum device is configured such that an elastic fixing piece is pressed into contact with the fixing piece fitting surface and engaged with the fixing piece engaging jaw portion between the parts.