JPH03291143A - Apparatus for continuously casting grid body for lead battery - Google Patents

Abstract

PURPOSE:To continuously and efficiently produce grid bodies by shortening the distance between axes of sprockets for annular molds to provide the annular molds with some clearance pressing the rear of rectangular shaped molds and always forming press contact condition. CONSTITUTION:The annular mold A and the annular mold B mutually paired and connecting the rectangular shaped molds 1 with chains 2, are driven with the chain sprockets 5, 5' and 6, 6'. Letting (r) for the distance from the center of the sprocket to the center of the surface of the rectangular shaped mold 1, (r') for the distance from the center of sprocket to the edge part of the rectangular shaped mold 1 and (t) for the thickness of the grid body cast in the mold, a space >=2(r'-r)+t is the necessary interval to rotate the annular molds A and B without interfering with each other and take out the grid body. The center distance between the sprockets 5, 6 is decided by shortening is center distance by the above space. At the straight line part 7 of the molds 1, the molds A, B are mutually brought into pressed contact, and molten metal is poured and the molds are continued with the press contact condition, and at the position approaching to the sprocket 5', the molds are opened and the grid body is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for continuously discharging grid bodies for lead-acid batteries.

Conventional techniques and their problems Grids for lead-acid batteries are manufactured by the casting method or the RI4I4 method, both of which have advantages and disadvantages.

The casting method is a method in which molten metal is poured into a pair of mating molds in which the shape of a lattice is engraved, and lattice bodies as shown in FIG. 12 are manufactured one by one. This method has the disadvantage that it is inefficient because the lattice is manufactured in batches, and that it cannot be connected continuously with the paste filling process, which is a subsequent process. Therefore, in recent years, machining methods have been adopted in place of the conventional casting method for producing grid bodies. A typical example of this Ili machining method is a method for manufacturing a lattice body using an extended band method. The lattice body manufactured by this method has a shape as shown in FIG. 13, and although the continuous manufacturing allows efficient connection with subsequent processes, it has the following drawbacks. First, to manufacture an expanded lattice, a lead alloy base metal must be formed into a sheet by rolling or other methods.

This sheet is then expanded using an expander, but this requires very large equipment and is
The lattice body that can be manufactured using this method is mainly limited to lead-calcium alloys, and it is difficult to apply it to lead-antimony alloys that are commonly used in lead-acid batteries. An even more fatal drawback is that, as can be seen from the lattice shape in Figure 13, the lattice body has no vertical master bars, resulting in poor voltage characteristics, and especially when used as a positive electrode plate, the lattice body tends to stretch. However, short circuits occur with the negative electrode strap, resulting in only lead-acid batteries having a short lifespan.

Therefore, a continuous casting apparatus capable of continuously manufacturing a lattice body by a casting method has been devised, and various proposals have been made so far. For example, according to Yoneda Patent No. 4,349°067, a molten metal supply section called a shoe is brought into contact with a drum in which the shape of a lattice is carved, and a mold groove formed between the drum and the shoe is filled with molten metal. An apparatus for producing cast grids continuously is described. However, in the lattice body manufactured by this method, since the mold is only the outer periphery of the drum, the shoe surface side has a flat cross-sectional shape as shown in Figure 11, and as is clear from this shape, the electrode plate filled with paste does not vibrate. The disadvantage is that the paste easily falls off. Furthermore, since the shoe, which is the molten metal supply part, is fixed, the drum rotates while sliding against the shoe, and a large number of cavities are generated on the shoe surface side of the manufactured lattice body. In particular, when used as a positive electrode plate, the lattice is severely corroded, making it impossible to obtain a lead-acid battery with good service life.In addition, the continuous casting method described above only produces lead alloys with a relatively narrow solidification range, such as lead-calcium lead alloys. It also has the disadvantage that it cannot be used and cannot produce pots with thick lattices.

Means for Solving the Problems The present invention provides a continuous casting device that eliminates all the drawbacks of the conventional method for producing grid bodies for lead-acid batteries as described above. A pair of molds in which a large number of strip-shaped molds are movably connected in an annular shape by a hinge mechanism are arranged so as to circulate facing each other, and at least a plurality of pairs of opposing strip-shaped molds are always pressed against each other to form a pair of mating @ By arranging the opposing strip-shaped molds so that the spacing between the opposing strip-shaped molds is equal to or more than a certain value at the sprocket portion, the iA This makes it possible to continuously produce lattice bodies with the same cross-sectional shape as the lattice bodies that can be produced.

Example Hereinafter, the present invention will be explained in detail based on a vaginal example.

FIG. 1 is a top view of the main body of a continuous casting apparatus for grid bodies for lead-acid batteries according to the present invention. In the figure, 1 is a rectangular mold, one side of which is carved in the shape of a divided lattice body, and the back side of the mold is hinged with other adjacent rectangular molds.
63 and 4 are connected to one frame 2 of a chain for movable coupling, and thereby a large number of strip-shaped molds are connected to each other to form an annular mold A. The strip-shaped molds 63 and 4 have the same structure, respectively. It is one piece of the chain, and forms an annular mold B that is paired with an annular mold A. A pair of annular molds A and B are arranged to circulate between a pair of sprockets 5, 5' and 6.6', respectively,
The annular molds A and B are brought into pressure contact with each other in the straight part 7 of the mold between the pair of sprockets, thereby forming a mating mold. Although the opposing linear portions 7 of the annular molds A and B move in the direction of the arrow, it can be seen that the two molds in the vicinity of 8°9 before and after are not pressed together and are spaced apart. The reason for this will be explained later. To further explain the rectangular molds 1 and 3 by clarifying the shape of the cross section taken along line C-C in FIG. 1, the pair of rectangular molds 1 and 3 in FIG. The upper end of the carved surface side has diagonally cut parts 12 and 13 ('j), and when the strip molds 1 and 3 are pressed together, a V-shaped eraser is formed. Bottle holes 14 and pins 15 are provided at the bottom of the carved surfaces of the rectangular molds 1 and 3, respectively, and the molds 1 and 3 are fixed by fitting these. The upper and lower U-shaped recesses on the back of the mold have V-shaped recesses, 1
6' ↓bi 17.1? The mold 1 is mounted on the ■-shaped rail 18' of the fixed plate 18, and the mold 3 is mounted on the movable plate 21 attached to the fixed plate 20 via an air cylinder 19.
It moves smoothly on the glyph rail 21'. In addition, 2.2
' and 4.4' are chains attached above and below the rectangular molds 1 and 3, and 22 is a device for heating the n-type. The hook-shaped heating device 22 may be provided over the entire press-contact portion of the annular molds A and B in FIG. 1, or may be provided to the extent that it can heat the vicinity of the supply portion of the molten metal. Furthermore, it is also possible to heat mold parts of the annular molds A, B that are not facing each other. Note that FIG. 3 is a top view of the rectangular mold.

Next, the reason why intervals are provided between several sets of strip-shaped molds (2 Ml in this embodiment) before and after the linear portion where the annular molds A and B face each other in FIG. 1 will be explained. Figure 4 is a diagram showing the case where the straight parts of the opposing strip-shaped molds are in ICE contact with the annular molds A and B between the sprockets 5, 5' and 6, 6' in Figure 1 under tension. Or, even if the stripe cut is driven in this state, the mold will not move. This is because, as shown in FIG. 5, an annular mold always has a constant width W, and the distance from the center 0 of the sprocket to the center of the lattice-shaped carved surface of the annular mold is less than r.

Since the distance r' from 0 to the edge F of the mold is longer, the sprocket does not rotate because the mutual edges get in the way. That is, in order for the sprocket to rotate, it is necessary to provide a gap of at least 2 [r'-r] between the opposing molds, as shown in FIG. Next, if we consider the case where a gap of 2(r' - r) is provided between the molds, the Suge V1 get rotates, or the edges of the pair of molds come into contact as shown in Figure 6, which is a success. There is a risk that the grid will be cut. In order to prevent this, it is advisable to provide a gap greater than the thickness of the lattice (t) between the edges, that is, the gap between the opposing B shapes should be at least 2 (r).
'-r) + t, the sprocket will rotate smoothly and the cast lattice will not break, but as it is, there is no pressure contact part of the mold, so the molten metal 4! ! It was not possible to cast the lattice body due to lead leakage, so
Sprockets 5.5' and 6.6 as shown in Figure 1.
' After shortening the distance between the molds to create play in the annular mold, the rectangular molds are pressed from the back side, excluding several sets (two sets in this example) of the front and back of the straight part where the annular molds A and B face each other. The area to be pressed is shown in FIG. 1) to form the part to be pressed.

By the way, when observing the movement of the strip-shaped molds near the outlet 9 of the lattice body shown in FIG. 1, it is found that when the annular molds A and B are separated from the part that presses them, a gap is created between adjacent molds. be. That is, between the molds 1' and 1'' and between the molds 3' and 3'' shown in FIG. If a gap is created between adjacent molds in this way, there is a risk that the lattice body will be cut at this portion. If you increase the number of molds from the pressing part to the sprocket, it is possible to make the gap between adjacent molds smaller by sweeping the molds in this part in an arc instead of a Wi line, but it is possible to Since the number of devices increases, the device cannot be made compact. Therefore, in order to prevent gaps from forming between adjacent molds, the molds before the ejection opening of the lattice body are moved back perpendicularly to the direction of movement, and the distance between the mold surfaces is gradually widened by the guide shown in Fig. 7. A plate 23 was provided. This guide plate 23 is for straightening the mold surfaces of the rectangular molds 1'' and 3'' on the sprockets 5' and 6' so that they are parallel to the direction of travel. The direction of the molds is corrected by the rollers 24 and 25 of the chain attached to the strip molds 1'' and 3'' hitting the guide plate 23.

FIG. 8 shows the movement of the strip-shaped mold when a guide plate (not shown) is attached to the continuous casting apparatus of FIG.

Next is what I mentioned above! An example will be described in which a lead-antimony alloy lattice body is cast using an F4 continuous casting apparatus according to the present invention.

First, when the drive device (not shown in the drawing) connected to the sprocket 5 is activated, the chain meshes with the teeth of the sprocket and moves, and the strip-shaped mold connected to the chain also moves along with it. At this time, when the rectangular mold] and 3 come to the position where they are combined, the pin hole 14 is inserted into the pin hole 15 provided on the carved surface.
The molds are fixed to each other. Therefore, the mold heating device 22 is activated, and when the temperature of each mold reaches 100°C or higher, a mold release agent is applied to the engraved surface of the mold.6 Next, the mold in the molten metal supply area is maintained at 150 to 160°C, and Operate the air cylinder 17 to create annular molds A and B.
pressure weld. When molten metal heated to 430 to 450°C is poured into the V-shaped groove at the top of the combined molds, the molten metal flows into the grooves in the lattice body, and as the mold moves, the molten metal that fills the grooves solidifies. A continuous lattice body having the shape shown in the figure was obtained. As shown in Fig. 10, the cross-sectional shape of the lattice body cast here is the same as that made with a conventional laminated mold, so-called block mold, and the conventional lattice body as shown in Fig. 11.
i1! Since one side is not flat like a lattice body spun by a continuous casting machine, it not only allows for good paste filling and provides a pole plate with excellent vibration resistance, but also prevents cavities from forming because there are no sliding parts. A lattice body with good corrosion resistance was manufactured.

Effects of the Invention According to the continuous casting apparatus for grid bodies for lead-acid batteries according to the present invention, the following effects can be obtained.

B. Grids of arbitrary shapes can be manufactured continuously and efficiently.
The connection with post-processes becomes continuous, and the electrode plate manufacturing process can be automated to a large extent. Further, a good lattice body can always be obtained without deformation when the lattice body is taken out.

By arranging the continuous casting apparatus shown in the embodiment in parallel, a number of strip-shaped lattice bodies can be manufactured at the same time. For example, by preparing two continuous casting apparatuses according to this embodiment, three strip-shaped lattice bodies can be manufactured at the same time, and the manufacturing efficiency of the lattice bodies is further improved.

C. There are no restrictions on the type of base metal that can be used, and it is possible to cast any type of alloy, including button-calcium alloys and button-antimony alloys, regardless of the antimony content, and the thickness of the lattice body can be freely changed. Can be done.

21 Since the continuous B casting device of the present invention has no sliding parts, the finish of the lattice body is good and there are no cavities unlike conventional continuous casting lattices, so it can be used satisfactorily as a positive electrode lattice. .

The electrode plate in which the grid body filled with paste is cast by the continuous molding apparatus according to the present invention has good vibration resistance because the active material does not fall off.

[Brief explanation of drawings]

Fig. 1 is a top view of the main body of a continuous i-forming apparatus for grid bodies for lead-acid batteries according to the present invention, Fig. 2 is a cross-sectional view of the strip-shaped mold taken along the C-C section in Fig. 1, and Fig. 3 is the strip-shaped mold. 4 is an enlarged top view of the annular molds A and B in a tensioned state.
Figure 5 is a diagram showing that the center of the mold surface carved with the lattice shape of the strip-shaped mold and the distance from the edge to the center of the sprocket is different. Figure 7 is a diagram showing the contact state, Figure 7 is a diagram with a guide plate installed on the strip-shaped mold near the lattice outlet, Figure 8 is a diagram showing the movement of the annular mold with the guide plate attached, Figure 9 10 is a sectional view of the lattice body manufactured by the present invention, FIG. 11 is a sectional view of the lattice body manufactured by the conventional continuous casting machine, and FIG. 12 is the lattice body manufactured by the conventional book mold type 8ya. FIG. 13 is a diagram showing the manufactured lattice body, and FIG. 13 is a diagram showing the shape of the lattice body by the expanded method. 1.3...Rectangular mold, 2,4...One piece of chain, 5.5', 6.6'...Sprocket, 10.1
1... Engraving of lattice shape, 12.13... Stripped cutting part, 14... Bottle hole, 15... Pin, 18.2
0...Fixed plate, 21...Movable plate, 19...Air cylinder, 23...Guidance plate <r'-rn-off eye diagram■ Easy isobody outlet

Claims (1)

[Scope of Claims] 1. A pair of annular molds A and B, in which a number of rectangular molds having engravings in the shape of dividing a lattice body in one plane, are movably connected in an annular shape by a hinge mechanism, respectively, are connected to a pair of sprockets 5, Arranged to circulate between 5' and 6, 6',
In a continuous casting device configured such that the annular molds in the linear portions of the pair of opposing annular molds move while being in pressure contact with each other by pressing behind them, r: a lattice of strip-shaped molds from the center of the sprocket; Distance r' to the center of the engraved surface: Distance from the center of the sprocket to the edge of the lattice shape engraved surface of the rectangular mold t: Thickness of the lattice, then the sprockets 5, 5' and 6, 6'
When the annular mold between them is under tension, the distance between the opposing strip-shaped mold surfaces is at least 2(r'-r)+t,
This is done by shortening the distance between the axes between 5, 5' and 6, 6' to provide play in the annular mold. 1. A continuous casting apparatus for a lead-acid battery lattice body, characterized in that a lattice body for a lead-acid battery is always in a press-contact state by pressing the lattice bodies.