JPS6316166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a device which is effective for use as a mixing device mainly used for kneading concrete, and is a mixing shaft formed by attaching a mixing member as a mixing tool around a rotating shaft. This invention relates to a horizontal multi-shaft mixing device in which a plurality of horizontally installed mixing tanks are provided.

Horizontal shaft type mixing equipment has a long history, and in conventional mixing equipment, which is limited to just two horizontal shafts and is used for mixing concrete, the driving means is directly attached to the side wall of the mixing tank that supports the mixing shaft. It has a flange structure and is removably fixed with bolts and nuts, or it has a rotatable structure on the mixing shaft as in the device of Japanese Patent Application Laid-Open No. 48-30149, which is equipped with a driving means and the mixing tank 1. In some cases, a set of connecting members is used to fix the device via a support element 25 fixed to the upper part.

By the way, since the driving means is attached to the mixing tank directly through a flange or indirectly through a support element and a connecting member, a reaction force for canceling the rotational torque generated by the driving means is generated. is transmitted straight to the mixing tank 1, so the dimensions of each member forming the reaction force canceling mechanism naturally become large, which not only increases the cost, but also increases the cost of this reaction force canceling mechanism and the driving means. The structure of the drive unit including the drive part is complicated, and the assembly adjustment is difficult. Especially the latter JP-A-48-
In the device disclosed in No. 30149, violent vibrations were generated from gaps around the bolts 26 of the support element 25, causing failures.

The present invention is an excellent proposal to eliminate these drawbacks. What is particularly important is how to cancel the reaction force for canceling the rotational torque of the mixing shaft.

The present invention does not require a reaction force canceling mechanism that is fixed to the mixing tank to cancel the reaction force of the drive means, but instead provides a driving mechanism for each of the protruding parts of the mixing shafts extending outward from the side wall of the mixing tank. In addition to providing the means in a removable manner, at least two connecting members located above and below the mixing shaft are used to integrate each driving means as a reaction force canceling mechanism.

With the above configuration, the reaction force generated by the driving means becomes an acting force acting on the connecting member, and the reaction force is canceled out inside the driving part, so that the reaction force of the driving means is not transmitted to the mixing tank at all. A favorable mechanical behavior is obtained.

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

Figures 1 to 4 show the whole of the invention mixing device, Figure 1 is a front view partially shown in cross section, Figure 2 is a left side view, Figure 3 is a right side view, and Figure 4 is a A in the diagram
It is a view from arrow A. Although this embodiment shows a horizontal two-shaft type mixing device, the mixing shafts are not limited to two shafts, and may be arranged in a multi-shaft arrangement as described later. In the figure, numeral 11 is a mixing shaft, and a mixing member is attached around the shaft. 12 is a mixing tank, and 13 is an example of a driving means for rotationally driving a mixing shaft, which is installed in a belt drive structure in which an electric motor is installed in the frame of a reducer and the distance between the axes of the two can be changed. be. Reference numeral 14 denotes a discharge gate, which is provided at a position where the rotation center 33 of the cylindrical gate is eccentric with respect to the arc center of the discharge port of the mixing tank.
The structure is such that the expansion and contraction of the opening and closing cylinders 31 and 31' is transmitted to the link to open and close the cylindrical gate.

In FIG. 2, a connecting member 21 disposed at the upper part of the mixing shaft 11 and a connecting member 22 disposed at the lower part of the mixing shaft 11 and having a longer overall length than the connecting member 21 have both ends formed into a pin structure, A drive section is formed by attaching to each reduction gear using pins 23 and 24 corresponding to the respective end pin holes, and having threaded sections 25, 26 and 27 for expanding and contracting the connecting member. On the other hand, the reducer, which is detachably attached to the mixing shaft, is configured to rotate freely with respect to the mixing tank. However, since the two reducers attached to each mixing shaft freely rotate independently with respect to the mixing tank, the two reducers 13 and 13' are connected to two sets of telescopic connecting members 21 and 22. If the reduction gear is not connected securely, it will not be possible to securely install the reducer in the desired position.

This will be explained using the schematic diagram in FIG. FIG. 5 is a diagram schematically showing the lines of force of the drive unit in FIG. 2, and _{5 5 5} and _{5 5 5} are the respective drive means 1.
3' and 13, and _B5 and _E5 are the same as each mixing shaft 11'. _{5 5} and _{5 5} indicate the connecting members 22 and 21. Therefore _{5 5} = _{5 5} , _{5 5} = _{5 5}
The relationship is α ₅ =′ ₅ .

Assuming that the balance between the rotational torques of the mixing shaft 11 and the mixing shaft 11', which are rotating in opposite directions, is lost, point _C5 rotates by an angle θ ₅ around _B5 , resulting in point _C'5 . If you move to , A ₅ points are
To point A′ ₅ , similarly, point E ₅ is the center of rotation and point D ₅ is
Move to D' ₅ point and _F5 point to _F'5 point respectively. In this case, the distance l′ ₂ of ′ ₅ ′ ₅ is β ₅ = 180° − α ₅ , _{5 5}
= _l4 ,
When B ₅ E ₅ = l ₅ , the following equation is obtained.

l' ₂ ² = [l ₄ cos (β _{5 -} θ ₅ ) - l ₄ cos (β ₅ + θ ₅ )] ² + [l ₅ - l ₄ sin (β ₅ + θ ₅ ) - l ₄ sin (β ₅ - θ ₅ )] ² = l ₅ ² −4l ₄ l ₅ sinβ ₅ cosθ ₅ +4l ₄ ² sin ² β ₅ −(1) Also, the distance l ₂ of _{5 5} is as follows.

l ₂ =l ₅ -2l ₄ sinβ ₅ -(2) From (1) and (2), l ₂ ² -l' ₂ ² =4l ₄ l ₅ sinβ ₅ -cosθ ₅ -4l ₄ l ₅ sinβ ₅ =4l ₄ l ₅ sinβ ₅ (cosθ ₅ −1)≦0 (sinβ ₅ >0) Therefore, when θ ₅ ≠0, l ₂ <l′ ₂ When θ ₅ =0, l ₂ =
It becomes l′ ₂ .

Here, since the connecting member has a strong structure that does not expand or contract under the rotational torque load, l ₂ =l' ₂ and θ ₅ =0. That is, the connecting member
A ₅ F ₅ and the connecting member _{5 5} , in other words, the connecting member 21
Both the mixing shaft 11 and the mixing shaft 24 are able to cancel and eliminate the unbalance of rotational torque caused by the mixing shaft 11 and the mixing shaft 11 due to the acting force due to the reaction force. The reaction force canceling mechanism described above has a structure that can also prevent the reaction force of the rotational torque generated by the driving means.

In this embodiment, the reaction force generated by the driving means can be internally offset only by the acting force acting on the connecting members 21 and 22, so that the reaction force is not transmitted to the mixing tank at all.

On the other hand, since it is formed from two sets of connecting members, there is no reversible misalignment between the pin holes and the pins around the pin holes 23, 23', 24, and 24'. Since no vibration is generated in the mixing tank, no mixer failure occurs due to the vibration. In order to obtain such a significant effect, it is necessary to adjust the threaded portion of at least one of the connecting members, expand or contract the connecting member, and force the gap between each pin hole and each pin to one end. is necessary.

In the above embodiment, the upper connecting member 21 has a shorter overall length than the lower connecting member 22, but it may be made longer than the lower connecting member 22, but the end of each connecting member may have a rigid frame structure instead of a pin structure. Of course you can do it.

In this way, since there is no vibration in the mixing tank, the dimensions of each component can be small, reducing costs.In addition, the structure of the reaction force canceling mechanism is simple, making it easier to assemble and adjust the drive part. is also easy.

Although the above description has focused on the horizontal two-shaft type mixing device, the arrangement of another horizontal multi-shaft type mixing device will be explained using another embodiment shown in FIG. As shown in Fig. 6A, a horizontal three-shaft type mixing device consisting of two mixing shafts each having a mixing member with a rotational outer diameter of A ₁₀ attached and one mixing shaft having a mixing member with a rotational outer diameter of B ₁₀ attached; and rotating outer diameter
A horizontal four-shaft type mixing device consisting of two mixing shafts with ₁₀ mixing members attached, or a horizontal multi-shaft type mixing device such as a horizontal multi-shaft mixing device, etc., comes to mind, but devices with various arrangements can be made depending on the purpose. .

As is clear from the above examples, the excellent features of this device will be the driving force behind the further spread of horizontal shaft type mixing devices in the future, and the excellent features of this device will serve as a driving force for the further spread of horizontal shaft type mixing devices. It will be welcomed by users as a device.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a cross section of a part of a horizontal twin-shaft mixing device used for concrete production as a specific example, Fig. 2 is a left side view, Fig. 3 is a right side view, FIG. 4 is a view taken along the line AA in FIG. 1 and shows the internal structure of the mixing device. FIG. 5 is a schematic diagram of the force lines of the driving means shown in FIG. 2, and FIG. 6 shows another embodiment of the horizontal multi-shaft mixing device. 11...Mixing shaft, 12...Mixing tank, 13...Reducer,
14...Discharge gate, 41...Mixing tool A (mixing member), 42...Mixing tool B (auxiliary mixing member), 43...
mixed arms.

Claims (1)

[Claims] 1. A plurality of mixing shafts provided with mixing tools around a horizontal rotation axis are provided in a mixing tank, separated from each other by an appropriate distance, and both ends of the mixing shafts are provided on both side walls of the mixing tank. In a mixing device supported by a shaft bearing, when at least one pair of driving means is removably provided on the protruding portions of the plurality of mixing shafts extending outwardly from the side wall of the mixing tank, each of the driving means is An upper connecting member located above the mixing shaft and a lower connecting member located below the mixing shaft are integrally fixed to constitute a driving section, and the reaction force generated by each of the driving means is A horizontal multi-axis mixing device, characterized in that it is formed in a drive section structure in which only the constituent members of the drive section cancel each other out. 2. The horizontal multi-shaft mixing device according to claim 1, wherein the total length of the upper connecting member is shorter than the total length of the lower connecting member. 3. The horizontal multi-shaft mixing device according to claim 1, wherein the total length of the upper connecting member is longer than the total length of the lower connecting member. 4. According to any one of claims 1 to 3, at least one of the connecting members is provided with an expansion mechanism that adjusts the overall length of the connecting member to be reduced (or expanded). horizontal multi-shaft mixing device. 5. The horizontal multi-shaft mixing device according to any one of claims 1 to 4, wherein the expansion and contraction mechanism is formed in a screwing means. 6. Claims 1 to 5, wherein both ends of each of the connecting members are formed into a pin structure.
The horizontal multi-shaft mixing device according to any one of paragraphs.