JPH06122045A - Continuous casting device for lead battery grid body - Google Patents

Abstract

PURPOSE:To provide a continuous casting device for a grid body of a lead battery, formed with engraved grooves with an angle in an upward direction, having a superior characteristic and by which a high productive efficiency is embodied. CONSTITUTION:Many strap shaped casting molds each of which is engraved with shapes of grid body on its plane face are annularly connected with hinge mechanisms to be couple of casting molds A and B, and A and B are arranged between couples of sprockets 5, 5' and 6, 6' to be synchronously circulated. A couple of doubling molds is formed by always pressurizing the back face of each of plural opposing strap shaped casting molds on a straight line between the sprockets. Each of the strap shaped casting molds 1 is formed with engraved grooves having an angle 10-80 deg. in the upward direction to the horizontal face by which the adjacent molds are laterally connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous casting apparatus for a lead storage battery grid.

[0002]

Lattice bodies for lead-acid batteries are generally manufactured by gravity casting or machining. The gravity casting method is a method in which the molten metal is poured into a pair of matching molds, which are called book molds and in which the shape of a lattice is engraved, and the lattices each having a shape as shown in FIG. 8A are manufactured one by one.
This method has a drawback that the production efficiency of the lattice is poor because the production of the lattice is a batch process, and the connection with the paste filling process, which is a subsequent process, cannot be made continuous.

Therefore, in recent years, a machining method has been adopted as a method of manufacturing a lattice body replacing the conventional gravity casting method. A typical example of this machining method is a method of manufacturing a lattice by an expanding method. The grid manufactured by this method has a shape as shown in FIG. 8 (B), and the productivity of the electrode plate is remarkably improved because the connection with the subsequent steps can be continuously performed. There was a flaw.

First, in order to manufacture an expanded lattice, a lead alloy ingot must be formed into a sheet by a method such as rolling. Next, this lead alloy sheet is processed into an expanded lattice by a developing machine, which requires a very large-scale device for the production and development of the lead alloy sheet, and the grids that can be produced by this method are mainly lead. -Limited to calcium alloys, it is difficult to apply to lead-antimony alloys that are often used in lead-acid batteries. A further fatal drawback is that the lattice body is very stretchable, as can be easily inferred from the lattice shape of FIG. 8 (B). In particular, when the expanded grid is used for the positive electrode plate, there is a drawback that the positive electrode plate comes into contact with the negative electrode strap to cause a short circuit due to the significant expansion of the grid due to charging and discharging of the battery, resulting in a short battery life. In addition, the grid has a large electric resistance and the voltage characteristics of the battery are poor.

Therefore, a method for producing a continuous lattice by a casting method has been proposed to solve these drawbacks. Although various inventions have been made so far, for example, according to US Pat. No. 4,349,067, a molten metal supply portion called a shoe is brought into contact with a rotary drum having a lattice shape engraved, and the drum is connected to the drum. An apparatus is described in which the grooves of a mold formed between the shoe and the shoe are filled with a molten metal to continuously cast a lattice. All of the conventional proposals are basically based on the above-mentioned method, but still have some drawbacks.

That is, the lattice body cast by this method has only the shape engraved on the outer periphery of the drum, and therefore has a cross-sectional shape as shown in FIG. 7, and as expected from this shape, There is a drawback that the filled paste is more likely to fall off as compared with the lattice body formed by the gravity casting method using the conventional matching mold having the cross-sectional shape shown in FIG.

Further, since the shoe, which is the molten metal supply section, is fixed, the drum rotates while sliding on the shoe, and a large number of cast holes are formed on the shoe surface side of the manufactured lattice. In particular, when it is used for the positive electrode plate, the grid is remarkably corroded, so that a battery having a good life performance cannot be obtained.

Further, since it is difficult to cool the molten metal supplied to the mold in the above continuous casting method, Pb-Ca alloy or Pb-low Sb
There is also a drawback that only a grid body of a lead alloy having a relatively narrow solidification range such as an alloy can be manufactured, and a grid body having a large thickness cannot be manufactured.

[0009]

SUMMARY OF THE INVENTION As described above, the conventional lead-acid battery grid body manufacturing method has a poor manufacturing efficiency,
Even if the manufacturing efficiency was good, the characteristics of the lattice were poor.
The problem to be solved by the present invention is to solve such conventional defects and how to efficiently and efficiently produce latticed bodies.

[0010]

According to the present invention, a pair of molds A and B in which a large number of strip-shaped molds each having a lattice shape engraved on one plane are connected in an annular shape by a hinge mechanism are provided with a pair of sprockets 5, 5 respectively. It is arranged so as to circulate synchronously between 'and 6', and the back surfaces of a plurality of strip-shaped molds facing each other in the straight part between the sprockets are always pressed to form a pair of mating molds. There
A horizontal connecting groove for connecting between adjacent strip-shaped molds is a mold having an engraving groove having an angle of 10 degrees or more and 80 degrees or less with respect to a horizontal plane, and the molten metal is continuously supplied into the mold. As a result, it became possible to continuously manufacture the lattice body having the characteristic of being castable by the above-mentioned conventional batch type matching mold.

[0011]

FIG. 1 is a plan view of a main body of a continuous casting apparatus for a lead-acid battery grid according to the present invention and a sectional view taken along the line D-D thereof.
In the figure, 1 is a strip-shaped mold, and the shape of a lattice is engraved on one plane thereof. The back of the chain is a chain for connecting to adjacent strip molds by a hinge mechanism.
A top 2 is attached, and by this, a large number of strip-shaped molds are connected to form a circular mold A. 3 and 4 are strip-shaped molds and chains of the same structure, respectively.
It is a top and forms a circular mold B which is paired with the circular mold A. The pair of annular molds A and B are adapted to circulate synchronously between a pair of sprockets 5, 5'and between a pair of sprockets 6, 6 ', respectively.

In the straight line portion 7 between the pair of sprockets, the annular molds A and B are pressed against each other to form a combined mold, and the annular mold is set against the ground as shown in the DD sectional view. It is horizontal.

The strip-shaped mold will be further described with reference to FIG. 2 showing the CC cross section of FIG. 1. In the figure, 1 and 3 are strip-shaped molds, and 8 and 9 are engraved grooves in the shape of a lattice. Is. The tops of the strip-shaped molds 1 and 3 on the side of the engraving surface of the lattice body are obliquely cut portions 10 and 11
Is provided, and a V-shaped groove is formed in a state where the pair of strip-shaped molds are pressed against each other. Reference numerals 12 and 13 denote pin holes and pins for fixing the mating molds formed by the pair of strip-shaped molds 1 and 3 so as not to shift.

Pulleys 14, 14 'and 15, 15' mounted in U-shaped recesses are provided on the left and right sides of the back surfaces of the molds 1 and 3, respectively. 3 is an air cylinder for pressing it
The movable plate 19 mounted on the fixed plate 18 via the V-shaped rails 19 'can be smoothly moved.

Reference numerals 2, 2'and 4, 4'represent one frame of chains attached to the upper and lower sides of the strip-shaped molds 1 and 3, respectively, by which a large number of strip-shaped molds are connected. Two
Reference numeral 0 is an apparatus for heating the mold. The supply of the molten metal is provided at a place where it enters the straight part 7 of the mold in FIG. However, if the position is not appropriate, there is a risk that the molten metal will flow in and leak before the pair of strip-shaped molds are combined to form a mold, so that the position of the molten metal supply port needs to be careful.

FIG. 3 (A) shows a front view of a lattice shape engraved on one plane of the strip-shaped mold 1, and FIG. 3 (B) shows a side view thereof. Reference numeral 21 is a carved portion of the upper part of the mold corresponding to the lower rib, 22 is a portion corresponding to the upper parent rail in the lateral direction of the lattice, and 23 is a portion corresponding to other lateral child rails.
Reference numeral 4 is a portion corresponding to a vertical crosspiece. The connecting groove portion 25 for connecting the adjacent molds is provided at a position for connecting the intermediate portion of the portion 23 corresponding to the horizontal crossbar so that the connecting groove portion 25 has an angle of 65 degrees with respect to the horizontal plane.

Next, an example of casting a lead-antimony continuous lattice using the continuous casting apparatus of the present invention will be described.
First, the air cylinder 17 is operated to press the annular molds in the linear portions 7 of the annular molds A and B to form a combined mold, and then a driving device (not shown) connected to the sprocket 5 is operated to operate the sprocket. The chain moves by meshing with the teeth, and the strip-shaped mold connected to the chain moves in the direction of the arrow in FIG.

Next, a heating device 2 provided on the back surface of the matching mold
When the mold temperature reaches about 150 ° C., a mold release agent is applied to the mold surface. At this time, the temperature of the mold decreases, so the temperature rises again and the mold is heated to 160 to 170 ° C.
When the temperature reaches, the molten metal whose temperature has been previously raised to 450 to 480 ° C. is poured into the V-shaped groove of the casting mold through the supply nozzle.

The molten metal fills the engraved grooves in the lattice shape of each individual casting mold. The molten metal flow at this time will be described with reference to FIG. After the engraved portion 21 is filled, the molten metal is applied to the entire mold by sequentially passing through the portion 24 corresponding to the vertical crosspiece and extending into the horizontal groove 23.

A connecting groove 25 is formed between the adjacent mating molds.
Connected only by. The connecting groove 25 has an angle of 65 degrees upward with respect to the horizontal plane, and is located so as to connect the intermediate portion of the portion 23 corresponding to the horizontal crossbar, so that the molten metal is directly applied to the horizontal crossbar. Since the molten metal does not flow out and flows out to the adjacent mold in a direction against gravity, the connecting groove 25 serves as a resistance against the flow of the molten metal, and the pushing metal does not work sufficiently to break the lattice bone.

The angle of the connecting groove is 10 degrees or more and 80 degrees.
A degree of less than or equal to is desirable. If the angle is less than 10 degrees, the hot water does not work sufficiently, and if the angle is more than 80 degrees, the molten metal becomes difficult to flow into the adjacent mold, and the lattice bone may be broken.

Assuming that the connecting groove 25 with the adjacent mold is provided at the same position as the lateral lattice bone 23 so as to communicate with the adjacent lattice body, the molten metal flowing into one mold does not remain in the mold. , It will flow directly to the horizontal crossbar. Therefore, the hot water does not work and the lattice bones are cut off,
A good continuous grid cannot be manufactured. In the present invention, the shape of the lattice body provided on the strip-shaped mold is as shown in FIG. 3 for the above-mentioned reason.

Therefore, the continuous lattice produced by the continuous casting apparatus of the present invention has a shape as shown in FIG. The continuous grid thus cast is processed into a shape as shown in FIG. 5, filled with a lead storage battery paste, and cut into individual plates to form electrode plates.

The cross-sectional shape of the lattice body cast by the continuous casting apparatus of the present invention is similar to that of gravity casting by the conventional book mold shown in FIG. 6, and is manufactured by the conventional continuous casting machine as shown in FIG. As one side of the grid is not flat, the paste filling is good, and not only is an electrode plate with excellent vibration resistance obtained, but since there are no sliding parts, no porosity is formed and corrosion resistance is good. Lattice bodies were obtained continuously.

[0025]

According to the continuous casting apparatus for a lead-acid battery lattice of the present invention, the following effects can be obtained. (A) Since the lattice body can be continuously and efficiently manufactured and can be continuously connected to the subsequent steps, the electrode plate manufacturing process can be largely automated. (B) There is no limitation on the type of alloy that can be used, it is possible to cast either lead-calcium type or lead-antimony type, and the lattices can be manufactured in various thicknesses from thin to thick. (C) In the present invention, the production of the lattice body is continuous, but since the same shape as the lattice body by the conventional gravity casting method can be obtained, no porosity is formed, the corrosion resistance is good, and the positive electrode lattice is also used. It exhibits excellent properties. (D) The cross-sectional shape of the lattice body manufactured by the continuous casting apparatus according to the present invention is the same as that of the conventional gravity casting method, and the electrode plate filled with the paste is less likely to cause the active material to fall off and also has the vibration resistance. It is good.

[Brief description of drawings]

FIG. 1 is a top view of a main body of a continuous casting apparatus for a lead-acid battery grid according to the present invention and a cross-sectional view taken along the line D-D thereof.

FIG. 2 is a sectional view taken along line CC of FIG.

[FIG. 3] (A) Front view of strip-shaped mold (B) Side view of strip-shaped mold

FIG. 4 is a schematic view of a continuous lattice manufactured by the continuous casting apparatus of the present invention.

FIG. 5 is a schematic view of a grid obtained by processing a continuous grid manufactured by the continuous casting apparatus of the present invention.

FIG. 6 is a cross-sectional view of a bar of a lattice body manufactured by a conventional gravity casting method.

FIG. 7 is a cross-sectional view of a bar of a continuous grid manufactured by a conventional continuous casting apparatus for a lead-acid battery grid.

FIG. 8 (A) Schematic view of a conventional gravity casting grid body. (B) Schematic view of a conventional expand method grid body.

[Explanation of symbols]

 1,3 Strip mold 2,2 ', 4,4' Chain 1 piece 5,5 ', 6,6' Sprocket 14,14 ', 15,15' Pulley 16,16 ', 19,19' V shape Rail 21 Engraved part on the upper part of the mold 22 Upper main crosspiece part in the horizontal direction 23 Child crosspiece in the horizontal direction 24 Vertical crosspiece 25 The connecting groove with the adjacent mold

Claims (1)

[Claims] 1. A pair of molds A and B in which a large number of strip-shaped molds each having a lattice shape engraved on one plane are annularly connected by a hinge mechanism, and a pair of sprockets 5, 5 '.
It arranges so that it may circulate synchronously between 6 and 6 ',
A structure for constantly pressing the back surfaces of a plurality of strip-shaped molds facing each other in a straight line portion between the sprockets to form a pair of mating molds, a horizontal communication groove connecting between adjacent strip-shaped molds is a horizontal plane. Contrary to this, a continuous casting device for a lead-acid battery grid body, which is a strip-shaped mold having an engraving groove having an angle of 10 degrees or more and 80 degrees or less in the upward direction.