JPH0611097Y2 - Abrasion resistant chip - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a wear-resistant tip used as a blade of a mixer such as an asphalt mixer or a fresh concrete mixer.

[Prior art and its problems]

FIG. 5 shows an asphalt mixer using conventional wear resistant chips.

In FIG. 5, reference numeral 1 is a mixer container of an asphalt mixer. A lining material 2 made of a wear resistant material (for example, eutectic graphite alloy cast iron) is adhered to the inner surface of the mixer container 1. In the mixer container 1, two quadrangular prism-shaped rotating shafts 3a and 3b are horizontally mounted so as to be parallel to the horizontal direction. The two rotary shafts 3a and 3b are rotated in the opposite directions. A plurality of rotating arms 4a and 4b extending in the diametrical direction are fixed to the rotating shafts 3a and 3b at predetermined intervals in the axial direction of the rotating shafts 3a and 3b. And each rotating arm 4
Abrasion resistant tips 5a, 5b made of the same abrasion resistant material as the lining material 2 are removably fastened and fixed by tightening bolts 6a, 6b to the tips of a and 4b. Further, the mounting positions of the rotary arms 4a and the wear resistant tip 5a and the rotary arms 4b and the wear resistant tip 5b are shifted by half a pitch in the axial direction so that they do not come into contact with each other during rotation. ing. In addition, each rotary shaft 3a, 3b
The plurality of sets of rotating arms 4a and 4b are attached to each other with a phase difference in the circumferential direction.

The asphalt produced by the asphalt mixer thus formed is manufactured as follows.

Asphalt is usually manufactured in a batch system. That is, a predetermined amount of the asphalt composition is put into the mixer container 1. After that, both rotary shafts 3a and 3b are rotated in opposite directions by a drive device (not shown) to rotate the plurality of rotary arms 4a and 4b.
The asphalt composition is gradually mixed by the wear-resistant chips 5a and 5b fixed to the tip of the b, and the asphalt composition is gradually mixed. The asphalt produced by this asphalt mixer is taken out from the mixer container 1 and used for asphalt pavement. Then, in the mixer container 1, the next predetermined amount of the asphalt composition is continuously mixed.

In this way, when the asphalt composition is mixed, each of the wear resistant chips 5a, 5b undergoes a severe wear action due to a large frictional force. Therefore, each wear-resistant tip 5
A and 5b are made of wear resistant material.

However, as shown in FIG. 7, the conventional wear-resistant tips 5a, 5b penetrate the two tightening bolts 6a, 6a into the elongated hole-like tightening holes 7 having the counterbore 8 on the surface side. Further, the rotation arm 4a is further penetrated, and the nut 10 is tightly fixed by interposing the spring washer 9 at the tip end portion exposed from the rotation arm 4a. Therefore, the conventional wear resistant tips 5a, 5
In b, the tightening bolts 6a exposed on the surface side,
The head 6c of 6b also comes into heavy contact with the asphalt composition and wears.

The wear resistant tips 5a, 5b and the tightening bolts 6a,
The wear of 6b starts from the exposed corners as shown in FIG. 8 (a). Then, as the wear gradually progresses and expands, as shown in FIG.
When the head portion 6c of b is worn down to a thin wall, the head portion 6c cannot be withstanding an excessive load and is broken, and the wear resistant tips 5a and 5b are separated from the rotating arms 4a and 4b. There was the inconvenience that the mixing function deteriorated. Therefore, in such a conventional example, the usable time from the start of use to immediately before the tightening bolts 6a and 6b are broken is very short, the durability is poor, and the wear resistant tips 5a and 5b must be frequently replaced. However, it is troublesome and costly.

Further, the wear resistant tips 5a, 5b are attached to the rotary arms 4a, 4b.
Once separated from b, it takes a lot of labor and time to find these in the asphalt, so the wear amount of the heads 6c of the tightening bolts 6a and 6b should be monitored.
If there is a risk of breakage, the wear resistant tips 5a, 5b and the tightening bolts 6a, 6b had to be replaced before the breakage.

Although the wear-resistant chips 5a and 5b can still withstand sufficient use, it is a waste of resources to replace the wear-resistant chips 5a and 5b due to breakage of the tightening bolts 6a and 6b, resulting in waste of the asphalt mixer itself. It will reduce the utilization rate.

[Purpose of device]

The present invention has been made in view of these points, and the tightening bolt can be tightened and fixed to the rotary arm without exposing the tightening bolt from the tip body to the outside, which is excellent in durability, and the tightening bolt may be broken. It is an object of the present invention to provide a wear-resistant tip that can improve the operation rate of a mixer.

[Outline of device]

The wear-resistant tip of the present invention is a wear-resistant tip that is attached to a rotating arm of a mixer with tightening bolts. In the wear-resistant tip, an elongated shaft portion insertion hole having a width that allows the shaft portion of the tightening bolt to be inserted, and the shaft portion insertion hole A recess space for forming a head insertion hole having an inner diameter capable of inserting the head portion of the tightening bolt provided in the central portion thereof and a seat portion for tightening the head portion of the tightening bolt on the side of the shaft insertion hole. The tightening hole of the tightening bolt in the shape of a bag hole, which is provided in the inner part of the shaft insertion hole and has a recessed space into which the head can be inserted, is the shaft insertion hole and the head. It is characterized in that the insertion hole is opened only on the joint surface of the chip body attached to the rotary arm, and is integrally formed at the time of casting of the chip body made of a wear-resistant material casting.

[Example of device]

An embodiment of the present invention will be described below with reference to FIGS.

1 to 3 show an embodiment of the present invention.

As shown in FIGS. 1 to 3, the wear-resistant tip 11 of the present embodiment has a tightening hole 13 in the tip body 12 that opens only on the joint surface 12a attached to the rotating arm 4a of the tip body 12. It is formed so that it is opened and tightened on the rotary arm 4a with the tightening bolts 6a and 6b.

More specifically, in the present embodiment, the tightening hole 13 is provided substantially at the center of the joining surface 12a of the chip body 12, and only the shaft portion 6d of the tightening bolt 6a can be inserted into the joining surface 12a. Elongated shaft portion insertion hole 1 having a width W
4 and a tightening bolt 6a at the center of the shaft insertion hole 14.
And a head insertion hole 15 having an inner diameter D through which the head 6c portion of the tightening bolt 6a can be inserted, and the head 6c portion of the tightening bolt 6a is inserted into the shaft insertion hole 14 for inserting the shaft portion. Hole 14
A recessed space 16 is provided which can be moved along the longitudinal direction of the head and which forms a seat portion 17 of the head portion 6c when tightening.

In order to fix the wear-resistant tip 11 thus formed to the tip of the rotating arm 4a, first, one tightening bolt 6a is used.
The head portion 6c is inserted into the head insertion hole 15 of the tightening hole 13, and then the head portion 6c is held at the position of the recessed space 16 and the shaft portion 6d enters into the shaft portion insertion hole 14. Thus, the head portion 6c is moved in the longitudinal direction and placed on the seat portion 17 that forms the side portion of the shaft insertion hole 14. In the same manner, the other one tightening bolt 6a is also inserted into the shaft insertion hole 14 on the opposite side of the previously inserted tightening bolt 6a. After that, the two tightening bolts 6a, 6a are moved into the bolt insertion holes 18, 18 of the rotary arm 4a in the shaft insertion hole 14 for alignment and then inserted, and the bolts are inserted opposite to the bolt insertion hole 18. The spring washers 19 are interposed at the tips of the tightening bolts 6a, 6a penetrating to the side to tighten the nuts 20, 20 respectively.

In this way, the wear resistant tip 11 of this embodiment is fixed to the rotary arm 4a without exposing the two tightening bolts 6a, 6a from the tip body 12 to the outside. Considering the cross-sectional shape such as the thickness and width of the seat portion 17, the strength of the material forming the chip body 12, etc., this fixing strength is sufficient to withstand the load acting when the composition of the asphalt is mixed. Has been adjusted.

Since the tightening bolts 6a, 6a are not exposed from the chip body 12 of the wear-resistant chip 11, as shown in FIG.
6a does not wear at all. Therefore, the wear-resistant tip 11 is firmly fixed to the rotary arm 4a for a long time. Further, even if the tip body 12 above the head 6c of the temporary tightening bolt 6a is greatly worn and the head 6c is exposed, a sufficient tightening force is applied until the head 6c is greatly worn. Since it has been exhibited, it is possible to further extend the use time of the wear resistant tip 11.

Further, in the wear resistant tip 11 of this embodiment, whether or not the head portion 6c of the tightening bolt 6a is exposed can be used as one kind of recognition means for grasping the wear amount of the tip body 12, and The recognition can be performed very easily and surely, and when the head 6c is exposed, it has sufficient strength and is a safe recognition means.

Although the hexagonal head bolts are used in the above-mentioned embodiment, they can be similarly applied to the case of using bolts having other shapes.

If necessary, a plurality of tightening holes 13 may be provided in the chip body 12 of the wear resistant chip 11, and
The tightening hole 13 may have a shape in which a dovetail groove is continuously formed.

Further, the present invention is not limited to the above-mentioned embodiments,
It can be changed if necessary.

[Effect of device]

As described above, since the wear resistant tip of the present invention is constructed and operates, the tightening bolt can be fastened and fixed to the rotating arm without exposing the tip to the outside of the tip body, and the tip body is worn after the start of use. The head of the tightening bolt becomes visible, and the usable time until just before the tightening bolt breaks is at least twice as long as the conventional example, which is extremely long.
It has excellent durability, does not break the tightening bolts used, does not require frequent replacement of wear resistant tips, can save labor, and can also reduce costs, and the mixer It is effective in improving the operating rate.

[Brief description of drawings]

1 to 4 show one embodiment of the wear resistant tip of the present invention, FIG. 1 is a perspective view showing a joint surface portion, FIG. 2 is a vertical sectional side view, and FIG. 3 is that of FIG. Bottom view, FIG. 4 is a vertical side view showing a worn state, FIG. 5 is a vertical side view of an asphalt mixer using a conventional wear resistant chip, and FIG. 6 is a perspective view showing a conventional wear resistant chip. FIG. 7 is a vertical sectional side view showing the mounted state, and FIGS. 8 (a) and 8 (b) are vertical sectional side views showing the degree of wear. 4a, 4b ... rotary arm, 6a, 6b ... tightening bolt, 1
DESCRIPTION OF SYMBOLS 1 ... Wear-resistant tip, 12 ... Tip main body, 12a ... Bonding surface, 13 ... Tightening hole, 14 ... Shaft part insertion hole, 15 ... Head insertion hole, 16 ... Recessed space, 17 ... Seat part.

Claims (1)

[Scope of utility model registration request] 1. A wear-resistant tip that is attached to a rotating arm of a mixer with a tightening bolt, wherein an elongated shaft insertion hole having a width that allows the shaft of the tightening bolt to be inserted and a central portion of the shaft insertion hole. A recessed space for forming a head insertion hole having an inner diameter capable of inserting the head of the tightening bolt provided, and a seat portion for head tightening of the tightening bolt on a side portion of the shaft insertion hole, The tightening holes of the tightening bolt in the shape of a bag hole, which is provided in the inner part of the shaft inserting hole and has a recessed space through which the head can be inserted, have the shaft inserting hole and the head inserting hole. A wear-resistant chip, characterized in that the chip body is integrally formed during casting of the chip body made of a casting of a wear-resistant material so as to be opened only in a joint surface attached to the rotary arm of the chip body.