JPS5837057B2 - Battery grid continuous casting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously casting battery grids.

Such a device is shown in US Pat. No. 3,455,371.

However, in this known invention, the tip of the distribution opening provided in the head is located at the part where molten lead is injected into the mold, and the head and belt are joined at that part.

The angle between the distribution opening and the outer circumferential surface of the mold cylinder is a needle-like, sharp angle, and the excess molten lead that is pressurized and sent by the pump is funneled through an opening on the side of the drum. It is designed to return to the lead pot rather than the pipe.

Therefore, lead is injected into the mold without being pressurized, making it difficult to produce high-quality lead molded products and making it difficult to form the expected accurate molding surface at the boundary between the head and the belt. The solidified lead adheres to the belt, which serves as the material, and causes further contamination of the material.

Therefore, the purpose of the present invention is to obtain high-quality and precisely shaped products through continuous molding at high speed, and to prevent solidified lead from adhering to the supply route and the material, causing clogging and staining. The purpose of the present invention is to provide a continuous casting device for a battery-free grid.

This purpose consists of a rotating drum that is provided with a mold that matches a desired battery grid pattern on the outer circumferential surface of a cylinder and rotates in one direction at a predetermined speed, and a mold that is placed around a relatively short arcuate segment on the outer circumferential surface of the cylinder of the drum. a fixation shoe having arcuate surfaces extending in close sliding relationship; is provided with an orifice groove extending over the entire width of the grid mold and in the radial direction of the drum and connecting the drum outer surface with the molten lead passage, which molten lead passage communicates with the molten lead pot via a pump and an inlet conduit which also melts the molten lead. The orifice groove includes an outlet conduit communicating with the lead pot, the orifice groove has a circumferential width larger than the width of the mold groove, and the cross section of the downstream edge of the orifice groove is substantially perpendicular. This is achieved by the continuous casting apparatus of the battery grid.

With this configuration, the molten lead under pressure between the inlet pipe and the outlet pipe is supplied from the orifice groove to the continuous casting mold of the rotating drum, and the cross section of the downstream edge of the orifice groove is approximately It has a great ability to shear lead that is about to solidify at right angles to the drum mold, and can reliably achieve the above purpose.

The objects, features, and effects of the present invention will be explained in more detail below with reference to the accompanying drawings.

In Figures 1 to 3, 10 is a heated lead pot 1.
4 is a support frame for mounting the device on the support structure 12 of No. 4.

The frame 10 may be of any suitable shape, but in this embodiment it consists of a pair of spaced apart rails 16 which are vertically adjustable and supported at opposite ends by upright threaded rods 18.

(2) A pair of bearings 20 are mounted on the rail 16 and support a shaft 22 to which a casting drum 24 is keyed.

A suitable drive 26 is coupled to shaft 22 to rotate drum 24 at a desired speed.

In the configuration of FIG. 1, drum 24 rotates counterclockwise.

28 are a pair of support rods attached to shaft 22 on opposite sides of drum 24 by bearings 30.

One end of each support rod 28 is secured to an adjacent rail 16 at a desired angle of inclination by a screw 32.

Reference numeral 34 designates a pair of guide rods spaced from side to side, which are attached to the support rod 28 by screws 36.38, and the screws 36.3
8, it is adjusted to approach and retreat from the support rod 28.

A shoe 40 is installed between both guide rods 34.

A battery grid mold 42 with a desired pattern is machined on the smooth cylindrical outer peripheral surface of the drum 24.

In this grid pattern, 44 is a plurality of longitudinal grooves extending in the circumferential direction, and 46 is a plurality of lateral grooves extending in a direction crossing this.

The longitudinal grooves 44 form the longitudinally extending wires 44a, 44b in the complete grid shown in FIG. 2, and the transverse grooves 46 form the transverse wires 46a, 46b.

The wires 44b and 46b forming the outer frame of the finished product are usually made wider than the inner wires 44a and 46a.

On one side of the grid, the longitudinal grooves 44 are widened to form one side of each grid.
A known solder tab 44c is formed near the end.

Both sides of the grid type end at points inward from both ends of the drum 24 (FIG. 3).

Therefore, both outer end portions 4B of the drum 24 have grooves 44 . 46
It takes the shape of a smooth continuous cylindrical surface located on the same cylindrical surface as the peak portion 48a defined by.

In the illustrated embodiment, the drum 24 consists of a central web 50 and a cylindrical flange 52 surrounding its outer periphery.

The grid mold 42 is machined on the outer peripheral surface of this flange 52.

The shoe 40 is a piece of metal with a smooth arcuate surface 54 that is connected to the cylindrical outer circumferential surface 48,48 of the drum 24.
a and is in sliding engagement with it.

Good sliding contact between the arcuate surface 54 of the shoe 40 and the cylindrical outer peripheral surface of the drum 24 can be achieved by adjusting the screws 36, 38.

In the embodiments of FIGS. 1 to 6 and 9, the shoe 40
has an inlet 56 on one side and an outlet 58 on the other side.

60 laterally passes through the shoe 40 and has an inlet 56 and an outlet 58.
An internal orifice groove extends therebetween and opens into the arcuate surface 54.

The orifice groove 60 has a smaller diameter than the inlet 56 and the outlet 58, and communicates with the inlet and outlet at both ends by an upwardly sloping passageway 62.

As shown in FIG. 6, the orifice groove 60 is provided in the lateral direction of the drum 24 in parallel with the grid mold 42.

As shown in FIG. 3, a conduit 64 extends downwardly from the inlet 56 into the molten lead within the pot 14 and connects to the outlet of the pump 66.

68 is a suitable drive shaft extending upwardly from the pump to drive the pump at a desired speed.

A similar conduit 70 descends into the lead pot 14 from the outlet 58 and opens into the lead pot via a control valve 72.

In this case, the amount controlled by the valve 72 is adjusted by the adjustment rod 74.

Valve 72 may adjust the flow rate and return pressure of lead within orifice groove 60.

The liquid level in the lead pot 14 is indicated by a broken line 76.

The lower portion of the drum 24 is spaced above the lead level 76, but the shoe 40 is partially immersed in the lead within the pot 14.

Reference numeral 78 indicates a plurality of coolant passages provided in the shoe 40, each of which is located above the liquid level 76.

In the illustrated configuration, three coolant passages 78 pass laterally through the shoe 40 downstream of the orifice groove 60 and one passage 78 passes laterally through the shoe 40 upstream of the orifice groove 60. ing.

The upstream coolant passage 78 is provided to prevent molten lead from flowing clockwise from the orifice groove 60 and overflowing from the upstream end of the drum and shoe.

The terms "upstream" and "downstream" are used here with respect to the direction of rotation of the drum.

The passages 78 are connected by suitable pipes 80 to communicate a suitable cooling liquid, such as water, to the shoe 40.

A thermocouple is preferably mounted within a thermocouple recess 82 in shoe 40.

In operation, the drum 24 is rotated at a desired speed and the pump 6 is
6 to operate molten lead alloy (e.g. 371-427°C
(700-8000F)) is continuously fed to the inlet 56.

Inside the drum flange 52 is preferably an air nozzle 84.
the casting surface of the drum is substantially below the solidification temperature of the alloy (e.g. 204-260°C (400-5000°C).
F)) Maintain the temperature.

Thus, molten lead introduced by pump 66 through inlet 56 into orifice groove 60 is rapidly cooled as it contacts surfaces 48, 48a and grooves 44, 46 formed on the outer surface of drum 24.

Since the drum is rotating counterclockwise, the surface is 48.48
Lead that attempts to solidify on a tends to be scraped off and deposited along the downstream edge 86 (see FIG. 4a) of the orifice groove 60.

However, because the pump 66 introduces much more molten lead through the orifice groove 60 than is required to fill the adjacent portion of the rotating mold, the lead flow through the orifice groove 60 remains at a relatively high temperature. The solidified lead scraped off the drum surface is thoroughly melted, crushed, and removed.

Since the high temperature molten lead passes through the orifice groove 60 continuously at high speed in this manner, solidified lead does not accumulate along the edge 86, thereby preventing the orifice groove 60 from clogging.

Additionally, free lead flow through outlet 58 and back to the lead pot is controlled by valve 72, so that the lead in orifice groove 60 is maintained under the desired degree of overpressure, which forces molten lead into the orifice groove. The grooves 44 and 46 that have passed through the grooves 60 and rotated upward are continuously press-fitted into every corner.

Thus, even if a void remains inside the groove 44,46 after it has passed through the orifice groove 60, the groove 44,46 will eventually be completely filled.

This flow of excess lead and the overpressure of the lead towards the grid mold together ensure rapid cooling in the grooves and successive complete filling of the grid mold.

This rapid cooling results in a very fine and uniform grain structure in the lead alloy.

This fine grain structure has high corrosion resistance, which is an excellent property for cast battery grids.

The filled groove 44 , 46 rotates upwardly in a counterclockwise direction, following the portion of the shoe 40 that is cooled by the coolant passage 78 downstream of the orifice groove 60 .

The lead temperature in these grooves then drops rapidly and the lead emerging from the downstream end of the shoe solidifies into a continuous strip with a buttery grid pattern.

The strip S is preferably stripped from the top of the drum and cooled to a sufficiently low temperature so that it is sufficiently rigid for easy handling.

After the grid strip S emerges from between the shoe and the drum, it is sufficiently cooled by a nozzle 84 which rotates both the inner and outer surfaces of the flange 52 past the shoe and before the finished product is stripped off. , directing airflow against both surfaces.

The strip S then advances to a die (not shown) where it is cut into individual battery grids.

In a typical device according to the invention, the drum has a diameter of about 45. 7cyyt (18 inches), width approx. 8.
3-inch (3-inch), rotation speed is 2 Orpm. The linear velocity 4 is 2865 crrL (94 feet) per minute.

Battery grid contains 0.09% calcium and 0.3% tin
It is approximately 14 cm (5-inch) long, 5 crrL (2 inch) wide, and 0.9 mm (0.9 mm) thick.
．． 035 inches).

The weight of each individual grid is 18g, and the weight of the grid strip before cutting is 126.9/in (0.085
1 bs/ft).

A grid strip moving at a linear velocity of 2865 crrL (94 ft) per minute is moving at a linear velocity of 3.6 kg (8 1 bs) per minute.
) alloy is used.

Pump 66 is 20.5kg per minute (451bs)
The inlet can be operated at full capacity or adjusted to provide somewhat less than full capacity by adjusting control valve 72.

The shoe 40 has a length of approximately 10 crrL (4 inches) and a width of 8.
3CrrL1 (37 inches).

The orifice groove 60 is 9.5ml (all inches), approximately 8m deep.
l&inch) and approximately 2.54c from the upstream end of the shoe.
m (1 inch) position.

Lead pot: 399-427°C (750-800OF)
heated to a temperature of

Approximately 21°C (70'F) (7) With cooling water and air nozzles shown, the shoe temperature is approximately 302°C (575°F)
Also, the temperature on the outside surface of the drum is approximately 232°C (450'F).
) becomes stable.

Although the above relative dimensions and other parameters are given by way of example only and are not absolute, there are a few things of fundamental importance.

For example, it is very important to maintain a close sliding relationship between the arcuate surface 54 of the shoe 40 and the outer circumferential surface of the drum.

Because the shoe and drum temperatures are substantially different, and each temperature is locally different, relatively rapid solidification of the grid strips is required to ensure close sliding contact between the shoe and drum. Shoe length should be kept to a minimum according to

Furthermore, if the shoes are too long, a greater clamping force must be applied to the drum to achieve intimate engagement with the drum, causing excessive friction.

Further, in order to prevent the temperature of the drum from increasing excessively at the portion in contact with the chute, it is desirable that the orifice groove be relatively narrow.

Moreover, it is important to keep the upstream end of the shoe and the portion of the drum in contact with it at a sufficiently low temperature to prevent the press-fitted molten lead from leaking out between the shoe and the drum.

The amount of molten lead supplied by the pump is greater than the amount required to fill the grid mold in order to maintain the lead temperature in the orifice groove high enough to melt and wash away the lead that solidifies on the smooth outer surface of the drum. There must be.

Moreover, the pressure applied to the molten lead in the orifice groove is sufficiently high that the lead is forced into the interior, overcoming pores and blockages that occur when the mold grooves 44 and 46 pass through the orifice groove and rotate upward. There must be.

The shoe 88 of FIGS. 1 and 8 is slightly different from the shoe 40 described above.

In shoe 88, two molten lead passageways 90, 92 extend laterally through the shoe.

At one end these passages are closed and at the other end one of these passages is closed.
One passage is connected to an inlet pipe extending from pump 66 and the other passage is connected to an outlet pipe leading to control valve 72.

An orifice groove 96 similar to the orifice groove 60 is provided in the arcuate surface 94 of the shoe 88 by machining.

The other end of this orifice groove 96 is closed.

Two pairs of oppositely inclined passages 98, 100 extend from the passages 90, 92 toward the orifice groove 96.

Therefore, in FIG. 8, passage 90 is an inlet passage, passage 92 is
If considered as the exit passage, the molten lead first ascends through the inclined passage 98 to the orifice groove 96, and then the orifice groove 96.
from the control valve 72 downwardly toward the outlet passage 92.
It is a continuous flow that returns to the lead pot.

Whether these molten lead passages in the shoes are of the type shown in Figures 1 to 6 or of the type shown in Figures 7 and 8, the orifice grooves serve as entrances to the lead recirculation path. and are sequentially connected to the exit.

The hot molten lead is therefore continuously recirculated over the entire length of the orifice groove.

This constant flow of hot molten lead and injecting with overpressure prevents excessive cooling and prevents lead from being locally deposited on the drum surface.

Additionally, lead that has solidified and been scraped from the drum by the downstream edge of the orifice groove is dissolved, crushed or otherwise removed to prevent clogging of the orifice groove or incomplete filling of the groove in the form of a battery grid. To prevent.

The embodiment of FIG. 9 differs from that of FIG. 1 in that the shoe 40a is located at the top of the drum 24 rather than at the bottom.

When the shoe is not in position to be partially immersed in molten lead in pot 14, auxiliary heater 102 maintains the relatively high temperature required for the shoe.

In other respects, the structure and operation of the embodiment of FIG. 9 are substantially the same as the previous embodiment.

It should be noted in each embodiment that the drum is positioned so that it does not come into contact with the molten lead in the lead pot.

This is not only desirable from the standpoint of keeping the drum at a desirable low temperature for rapid solidification, but also because oxides and other impurities will form, accumulate, or adhere to the outer surface of the drum when the drum is wetted with a lead bath. be.

The lead also flows through a completely closed passageway between the lead pot and the orifice groove, which virtually eliminates the tendency for oxide films and particles to form and become entrained in the molten lead during casting.

[Brief explanation of drawings]

1 is a longitudinal section in a plane perpendicular to the axis of rotation of the casting drum of a battery grid casting apparatus according to the invention; FIG. 2 is a plan view of a portion of a continuous battery grid strip cast with the apparatus; FIG. The figure is a sectional view taken along line 3-3 in Fig. 1, Fig. 4 is a sectional view taken along line 44 in Fig. 3, Fig. 4a is an enlarged view of a part of the structure in Fig. 6 is a sectional view of a portion taken along line 6-6 in FIG. 5, FIG. 7 is a sectional view of a modified example of the shoe of this device, and FIG. FIG. 9 is a sectional view taken along line 8--8 in the figure, and FIG. 9 is a partial side view in partial cross section of another embodiment of the present device. 10...Frame, 52...Cylindrical flange, 14...Lead pot, 54...
Arc-shaped surface of shoe, 24... Casting drum, 60.
...Orifice groove, 40...Shoe, Terrigrid type, 46...Type groove, 7 Tudo strip. 66...Ponfu, 42...Ba72.
...control valve, 44,

Claims (1)

[Claims] 1. A mold that matches a desired battery grid pattern is placed on a cylindrical outer circumferential surface of a rotary drum that rotates in one direction at a predetermined speed, and is closely slid around a relatively short arcuate segment of the cylindrical outer circumferential surface of the drum. a locking shoe with an arcuate surface extending in relation to the mold, the mold including a plurality of spaced mold grooves extending both circumferentially and axially in the outer peripheral surface;
The fixing shoe is provided with an orifice groove extending over the entire width of the grid mold and in the radial direction of the drum and connecting the outer circumferential surface of the drum with a molten lead passage, the molten lead passage having an inlet conduit that communicates with the molten lead pot via a pump. and an outlet conduit in communication with the molten lead pot, the orifice groove having a circumferential width greater than the width of the mold groove and having a cross-section of the downstream edge of the orifice groove at a substantially right angle. A continuous casting device for a battery grid, characterized in that: