JPS6140342Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a stirring arm for a pug mill mixer, in which a paddle arm is attached to a horizontal rotating shaft so as to be able to freely rotate vertically, and a paddle tip is attached to the tip of the paddle arm in a protruding state. Regarding.

Conventionally, in the above pug mill mixer, the paddle tip was integrally fixed to the paddle arm by welding. However, since the above-mentioned pug mill mixer is often used for mixing earth and sand, asphalt mixture, cement raw materials, etc., local wear of the protruding tip of the paddle tip is severe, and if the paddle tip wear exceeds a certain level, the As a result, the entire paddle tip and paddle arm had to be replaced with new ones, even though the base end of the paddle tip and the paddle arm were still in a usable condition, and the entire paddle tip and paddle arm had to be replaced with new ones. Because many stirring arms are attached to the pug mill mixer,
Overall, the drawback was that the economic burden of repairs was quite large.

SUMMARY OF THE INVENTION An object of the present invention is to improve the mounting structure of the paddle tip so that repair costs associated with wear of the paddle tip can be greatly reduced.

The characteristic configuration of the present invention is that the paddle tip, which is attached in a protruding state to the tip side of the paddle arm that rotates in the vertical direction, is formed in a symmetrical or almost symmetrical shape in the longitudinal direction of the paddle arm, and the paddle tip is attached to the tip of the paddle arm that rotates in the vertical direction. The mechanism is connected to the paddle arm so that it can be reversed in the longitudinal direction, and its effects are as follows.

In other words, if the protruding end of the paddle tip wears beyond a certain level, loosen or remove the screw, turn the paddle tip over and attach it to the paddle arm, and use the other end, which is still barely worn, protruding from the paddle arm. This is possible because the paddle tip is symmetrical or nearly symmetrical in the longitudinal direction of the paddle arm, and the life of the paddle tip can be extended approximately twice as compared to the conventional paddle tip.

Also, even if the paddle tip becomes unusable,
Since the paddle arm can be left as is and only the paddle tip can be replaced, the cost required for replacement can be reduced.

As a result, overall repair costs for paddle tip wear can be significantly reduced compared to conventional pug mill mixers equipped with a large number of paddle tips, making it possible to provide an economically superior pug mill mixer. Ta.

Next, an embodiment will be shown with reference to FIGS. 1 to 3. In Fig. 1, 1 is a fixed body length case;
2 and 3 are horizontal rotating shafts installed in the case 1 in a parallel position, and A is a stirring arm that is fixedly connected to the bracket 4 of each rotating shaft 2 and 3 via bolts and nuts 5 so as to be freely rotatable vertically. 6 is each rotating shaft 2,
Bearings 7 and 8 at both ends of 3 are gears of the same diameter that are fixed to the respective rotating shafts 2 and 3, and the two mesh with each other, so that both rotating shafts 2 and 3 rotate synchronously and at the same speed in opposite directions. This direction is an ideal direction in which the two arms A, A approach each other when going from bottom to top, and then move away from each other. A sprocket 9 is fixed to the shaft end of one rotating shaft 2, and a transmission chain 12 is spanned between this sprocket and an output sprocket 11 of a motor 10. 13 is an input port, and 14 is a discharge port.

The arrangement pattern of arm equipment A has the following relationship with respect to both rotation axes 2 and 3.

They are spaced at equal pitches in the axial direction.

Two are provided 180 degrees apart in the circumferential direction at each point in the axial direction.

The paddle tip 15 is inclined with respect to a plane perpendicular to the axis.

The paddle tip 15 is located on the front side of the paddle arm 16 in the rotational direction. However, there are exceptions as mentioned below*.

Arms A and A that are adjacent to each other in the axial direction have a phase difference of 90 degrees.

At the same position in the axial direction, arm A on one shaft and arm A on the other shaft are in a 90 degree relationship.

* However, the arm A at the end on the discharge side is for either shaft, and for the drive rotation shaft 2, the third and fifth arm A from the end are for the paddle tip 15. The direction is inversely related to the others.
That is, it provides resistance to the flow of the mixture,
This is to lengthen the residence time in the case 1, in other words to prevent the mixture from slipping out, and to allow the mixture to be sufficiently stirred by the arm group A.

Now, an example of the stirring arm A is shown in FIGS. 2 and 3. The paddle arm 16 has an insertion hole 17 for a bolt/nut 5 at its base end where it is inserted into the bracket 4, and a paddle tip 15 at its distal end.
An insertion hole 19 for a screw 18 (a bolt is representatively shown) for attaching the paddle tip 15 and an insertion hole 21 for a pin 20 for preventing rotation of the paddle tip 15 are formed.
22 is a recess formed on the entrance side of the hole 19, and a screw 18
The entire head 23 of the head 23 is buried to prevent the head 23 from being worn out by contact with the mixture as much as possible.

The paddle tip 15 is a drum-shaped flat plate, and has an insertion hole 24 for the screw 18 in the middle part of the paddle tip 15 in the longitudinal direction of the paddle arm 16, and a large diameter recess 2 for embedding the female screw 25 (nut) on the exit side.
6, and the rotating shafts 2, 3
along the line toward the center of the hole 24,
Then, place the pin 20 in a symmetrical position with the hole 24 in between.
Engagement holes 27, 27 are formed for the. The paddle tip 15 is formed in a symmetrical or almost symmetrical shape in the longitudinal direction of the paddle arm 16, and is connected to the paddle arm 16 so as to protrude from the distal end side of the paddle arm 16 and to be reversible and attachable in the longitudinal direction of the paddle arm 16. and can be used as follows.

When the outer part b has worn beyond a certain level, screw 1
Loosen part 8 and turn tip 15 180 degrees so that part b is on the inside and part a, which was on the inside until now, is on the outside.
Turn it over once again and tighten the screw 18 again.

Next, another example will be listed.

The paddle tip 15 may be point symmetrical with its center point as the center of symmetry. In other words, it does not have to be line symmetric. In this case, as a general rule, the exchange is done by flipping 180 degrees around the center of symmetry.

Note that the above example is both line symmetric and point symmetric,
In this case, they can also be swapped by flipping the front and back sides.

Instead of the pins 20, 20, a screw type may be used.

The paddle tip 15 may have two holes arranged vertically as shown in Fig. 4, or may have four holes arranged vertically as shown in Fig. 5, and two of them are used for fixing. 6 As shown in figure 2
Two holes may be arranged side by side and used for fixing both before and after inversion.

The outer contour of the paddle tip 15 may be circular, oval, square, hourglass, or any other shape as long as it has symmetry.

The paddle tip 15 may be made of the same material as the paddle arm 16, but it is preferably made of a material with higher wear resistance than the paddle arm 16, such as cast steel or other special steel.

The paddle arm 16 may have a linear shape that is inclined with respect to the radial direction of the rotating shafts 2 and 3, or a circular arc shape.

When the screw 18 is made of a material with high hardness such as cemented carbide, the recess 22 may be omitted.

When forming a step on the arm 16 to prevent the tip 15 from rotating, use the pins 20, 20 and the holes 21, 21.
It is also possible to omit it.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention,
FIG. 1 is a cross-sectional plan view of the pug mill mixer, FIG. 2 is a sectional view of the stirring arm, and FIG. 3 is a front view of the stirring arm. 4 to 6 are rear views showing different embodiments of the stirring arm of the present invention. 3... Rotation axis, 15... Paddle tip, 16...
...paddle arm, 18...screw, 22...recess,
23... Screw head, 24... Insertion hole.

Claims (1)

[Claims for Utility Model Registration] A paddle arm 16 is attached to the horizontal rotating shaft 3 so as to be able to rotate integrally in the vertical direction, and a paddle tip 15 is attached to the distal end of the paddle arm 16 in a protruding state.
In the pug mill mixer, the paddle tip 15 is formed symmetrically or almost symmetrically in the longitudinal direction of the paddle arm 16, and the paddle tip 15 is attached to the paddle arm 1 by a screw 18.
6. A stirring arm for a pug mill mixer that is connected to the paddle arm 16 so as to be reversible in the longitudinal direction. The stirring arm for a pug mill mixer according to claim 1, wherein a recess 22 is formed in the paddle arm 16 in which the head 23 of the screw 18 is completely or almost completely buried. The stirring arm for a pug mill mixer according to claim 1 or 2, wherein an insertion hole 24 for the screw 18 is formed in the middle part of the paddle tip 15 in the longitudinal direction of the paddle arm 16.