JPS585093B2 - mixing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for mixing foundry sand, chemicals, other foods, etc. using a trough equipped with rotating stirring blades.

For example, to obtain self-hardening foundry river sand by adding and mixing a binder and a hardening agent to foundry sand, conventionally, the foundry sand, binder, and hardening agent are supplied to a single trough, and the mixture and transfer of the foundry sand results in self-hardening. However, at the start of operation, the timing of the supply of these multiple mixtures tends to deviate in time, and due to an imbalance in the amount of supply, the amount of mixture mixed at the beginning of operation is likely to deviate. The properties may deviate from what was expected, especially if the mixing device has to be repeatedly stopped each time a mold is made.
A large amount of the mixture was wasted, making it uneconomical.

In addition, when three types of materials are mixed all at once in a single trough, the homogeneity of the mixture decreases as a whole, resulting in poor mixing performance.In addition, if the curing reaction of the mixture occurs in the trough, This has the drawback that it hardens and adheres to the inner surface of the trough and the stirring blades, causing troubles during mixing and transport, and also making it extremely difficult to release.

Furthermore, since curing begins within the trough, the usable time until the mixture taken out from the trough hardens is shortened, which is disadvantageous in terms of workability.

In view of the above-mentioned circumstances, it is an object of the present invention to eliminate the above-mentioned drawbacks through extremely simple improvements, and to further simplify the driving structure of the entire device.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

A base 2 is attached to one end of the mount 1 so as to be rotatable around the vertical axis, and two troughs 3 and 4 are attached to the base 2.
are arranged side by side in the horizontal direction, and bearings 5 and 6 are attached to cover the openings at both ends of each of the troughs 3 and 4, and the mixture is stirred while being transferred across both bearings 5 and 6. Shafts 8 equipped with blades 7 are respectively installed concentrically with the trough axis and can be driven in reverse to each other by a deceleration drive device 9, and sand and binder are supplied to the transfer start ends of the respective troughs 3 and 4. Port 10 and sand and curing agent supply port 1
1 are connected in series, and the discharge sides of the transfer ends of both troughs 3 and 4 are connected through a box 12 to form a confluence mixing section 13 for the mixtures from both troughs 3 and 4, and their rotational trajectories are adjacent to each other. rotating mixing blade 14 that partially wraps in the
, 14 are directly connected to the rotation shafts 8, 8 of the rotary stirring blades 7, and are provided in the confluence mixing section 13, and are discharged to the downstream part of the confluence mixture in the intermediate part in the direction in which the rotary mixing blades 14, 14 are arranged side by side. In addition to providing an outlet 15, a discharge tube 17 equipped with an opening/closing device 16 is connected to the discharge port 15, so that the sand and binder and the sand and hardening agent are respectively transferred to separate troughs 3.
, 4, and agitate and mix them while merging them at a confluence mixing section 13 at the end of the transfer, thereby constructing a mixing device that continuously obtains self-hardening foundry river sand.

The opening/closing device 16 consists of a lid 18 that moves in a transverse direction on the mixture discharge path of the discharge tube 17, and a device 19 that drives the lid 18 to open and close as desired while fully opening, and removes sand and binder from the trough 3, and By switching the discharge port 15 to the fully closed state at the beginning of the operation when the sand and hardening agent are mixed in the trough 4, it is possible to prevent the sand and the curing agent from being mixed even if the timing of each supply is shifted in time and the supply amount becomes unbalanced. , they can be sufficiently retained and agitated in the trough, and can be mixed and stirred with the subsequent ones supplied at a predetermined ratio, and by homogenizing the entire retained mixture, the properties of those mixtures can be initialized. It is possible to obtain a mixture continuously with almost no loss in the initial stage of operation.

Since the sand and the binder and the sand and the curing agent are first mixed in separate troughs 3 and 4 and then secondarily mixed in the confluence mixing section 13, the three types of mixing can be performed with high homogeneity. Furthermore, since no curing reaction occurs within the trough, homogeneous mixing can be carried out well without causing any trouble on the mixing or transporting surfaces.

Moreover, the rotating mixing blade 14.1 in the confluence mixing section 13
4 is directly connected to and driven by the rotary stirring blade 7 . In order to install the device, there is no need to make the entire trough a strong structure, and in addition, since the casting river sand hardens and reacts only in the confluence mixing section 13, it is possible to easily release the sand, and to remove the mixture. It is advantageous in terms of work because the usable time until it hardens can be extended.

As shown in FIG. 4(a), as a mode of mixing rotation by the rotating mixing blades 14,
, 14 are arranged side by side from the center to both sides thereof, or as shown in FIG.
Various modifications are possible in these forms, such as a form in which the rotating mixing blades 14, 14 are repeatedly rotated in forward and reverse directions, or a form in which the rotation locus does not overlap.
As shown in FIG. 5, the upper surface of the box 12 is formed along the rotating mixing blades 14, 14, and the upper part of the mixing section 13 is transformed into a structure that eliminates dead space for the mixing blades 14, 14. It is possible.

Further, as shown in FIG. 6, the opening/closing device 16 can be modified in various ways, such as by making the lower part of the box 12 double-doored.

FIG. 7 shows a modification of the structure of the merging and mixing section, in which the trough 3,
4 are arranged in parallel in the vertical direction, an opening 20 is formed on the discharge side of the upper trough 3, and a confluence mixing section 13 is provided with a rotary mixing blade 14 directly connected to the rotary stirring blade 7 on the discharge side of the lower trough 4. The mixing section 13 and the opening 20 of the upper trough 3 are connected to each other by a cylinder 21, and the lower opening 15 of the mixing section 13 is provided with an opening/closing device 16. The materials to be mixed are allowed to naturally flow down into the confluence mixing section 13, and the materials to be mixed therefrom and the materials to be mixed from the lower trough 4 are mixed together and taken out.

Note that the mixed form can be modified in various ways, such as by arranging three or more troughs in parallel in the horizontal or vertical direction.

Furthermore, the curing agent may be used as a curing accelerator, or both may be used as a curing accelerator, or a mixture thereof may be mixed.

Furthermore, in addition to molding sand, there is a high demand for materials that are self-hardening, or even if they are not self-hardening, the homogeneity of the mixture is high, such as for food, medicine, and whetstones obtained by molding powdered whetstone materials. It can target various things, such as things.

In summary, the mixing device according to the present invention is provided with a plurality of troughs each equipped with rotating stirring blades with their discharge sides communicating with each other, a confluence mixing section is formed at the communicating point, and the confluence mixing section is provided with the rotating agitating blades. A rotating mixing blade directly connected to at least one of the stirring blades is provided, and an opening/closing device for the discharge port from the confluence mixing section is provided.

In other words, the objects to be mixed are separated and the appropriate ones are preliminarily mixed in a primary manner, and the mixture is finally mixed in a secondary manner, making it possible to mix these multiple types of materials with extremely high homogeneity. Moreover, even if the mixture eventually undergoes a curing reaction, the curing phenomenon does not occur in the trough, and the time required for the taken out mixture to harden is increased, making it difficult to place the mixture on the work surface. Moreover, since the vanes for confluence and mixing are directly connected to the rotating stirring vanes, there is no need for a special drive device for that purpose, which simplifies the overall drive structure, making it economical and improving the strength of the trough. There's no need to modify it.

In addition, a switch is provided to allow the materials to be mixed to be mixed in the trough, so even if the supply amount of the materials to be mixed becomes unbalanced over time at the beginning of operation, it is possible to sufficiently retain and stir the materials. By mixing it with the subsequent feed, it becomes possible to homogenize the mixture and bring its properties closer to the desired ones. Overall, the mixing process can be performed using multiple systems. By simply adding an opening/closing device to the mixer, it is possible to achieve a highly homogeneous mixing process with very little or no loss of the mixture. Became.

[Brief explanation of drawings]

The drawings illustrate an embodiment of the mixing device according to the present invention, in which FIG. 1 is an overall side view with main parts cut away, FIG. 2 is a cross-sectional plan view of the confluence mixing section, and FIG. It is a sectional view taken along the line ■-■. 4A, 5, and 6 are sectional views of the deformed structure corresponding to FIG. 3, respectively, and FIG. 7 is a longitudinal sectional side view showing the deformed structure of the merging and mixing section. 3.4... Trough, 7... Rotating stirring blade, 13... Merging mixing section, 14... Rotating mixing blade, 15...・Exhaust port, 16...
・Switching device.

Claims (1)

[Scope of Claims] 1. A plurality of troughs 3゜4 equipped with rotary stirring blades 7 are provided with their discharge sides communicating with each other, and a confluence mixing section 13 is formed at the communicating point, and the confluence mixing section 13 A rotary mixing blade 14 directly connected to at least one of the rotary stirring blades 7 is provided, and a discharge port 1 from the confluence mixing section 13 is provided.
5. A mixing device characterized in that a switching device 16 is provided for the mixing device 5. . 2. A patent characterized in that the troughs 3, 4 are arranged side by side in the horizontal direction, and a plurality of the rotating mixing blades 14, 14 are directly connected to each of the rotating stirring blades T, T, respectively. A mixing device according to claim 1. 3. The mixing device according to claim 2, characterized in that the rotational trajectories of the rotating mixing blades 14, 14 are configured such that the rotational trajectories of adjacent rotating mixing blades partially overlap. 4. Claim 1, characterized in that the troughs 3, 4 are arranged in parallel in the vertical direction, and the rotating mixing blade 14 is directly connected to the lowermost one of the rotating stirring blades 7, 7. Mixing equipment as described in Section.