JPH051594B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for determining the thickness defect of a strap of a lead-acid battery plate group.

[Prior Art] Conventionally, there is a cast-on method as one of the methods for forming a strap for a lead-acid battery plate group. To form a strap using this cast-on method, a mold with a strap recess that matches the shape of the strap and pole is placed below the plate ear of an inverted electrode group, and the strap recess of the mold is After injecting molten lead from the pouring spout of the melting pot, quickly immerse the plate lugs in the molten lead to form the straps and poles of the plate group, and at the same time join the plate lugs with the straps. It is something.

[Problems to be Solved by the Invention] However, in forming the strap by the above-mentioned cast-on method, the opening and closing of the valve of the melting pot is controlled by a timer, or by other means, the melting is applied to the strap recess of the mold. Although it is attempted to inject a fixed amount of lead, it is actually difficult to inject a fixed amount of molten lead due to the adhesion of lead oxide on the valve part of the melting pot, and as a result, the resulting strap has the disadvantage of being thin. Furthermore, if the strap is formed to be thinner than the required thickness, the connection between the plate lug and the strap will be insufficient, and the plate lug will come off from the strap during use of the storage battery, causing a failure. Moreover, it is difficult to develop a device to inspect the thickness of the strap, so currently the only method available is visual inspection.
This has become the key to saving labor.

[Means for Solving the Problems] In view of the above-mentioned problems, the present invention provides a method for easily determining whether the thickness of a strap formed by the cast-on method is good or bad.

That is, in the present invention, molten lead is poured into a mold in which a strap recess and a runner connected to the strap recess are dug, and the electrode plate lugs of the electrode plate group are immersed in the molten lead to form the electrode plate lugs. A storage battery electrode plate group characterized in that a strap with lead runner is integrally formed with the strap, and thereafter, defective thickness of the strap is determined by inspecting the presence or absence or thickness of the lead runner part of the lead runner strap. The present invention provides a method for determining whether a strap is good or bad.

[Example] Hereinafter, a method for determining the quality of straps of a battery plate group according to the present invention will be described with reference to the drawings.

FIG. 1 shows an example of a method for forming a strap for use in the determination method of the present invention.
is a group of electrode plates, which are inverted so that the electrode tabs 2 are at the bottom. Further, the electrode plate group 1 is clamped by a clamp mechanism (not shown in the figure) that can be raised and lowered. 3 is a mold in which a strap recess 4 and a runner 5 are dug, and the mold is placed below the electrode plate group 1 so that the strap recess 4 and the electrode plate lugs 2 of the electrode plate group 1 match. ing. Moreover, the runner 5 of the mold 3 is connected to the strap recess 4 and is dug, and its end is located outside the side green of the electrode plate group 1. Reference numeral 6 denotes a weir attached to the end of the runner 5, which functions to overflow excess molten lead and keep the thickness of the strap constant. However, if the amount of molten lead injected is stable and always constant, there is no need to intentionally inject extra molten lead to cause overflow. Further, 7 is a melting pot, inside of which a heater 8 is attached and filled with molten lead 9. Further, the melting pot 7 normally prevents the molten lead 9 from flowing out by a valve seat 10 on its bottom surface and a lowering of the needle valve 12 which moves up and down. Further, a pouring port 13 is installed below the melting pot 7, so that the valve seat 10, the hole 11, and the pouring groove 14 are aligned with each other. The tip of this pouring spout 13 is set at an appropriate interval A so that the electrode group 1 does not hit even if the electrode group 1 descends.
The molten lead 9 passing through the pouring port 13
The entire amount is the strap recess 4 and runner 5 of the mold 3.
It is preferable to install it inside the weir 6 (B≧0) so that the water is injected into the weir 6.

A method of forming a strap according to this embodiment will be explained. First, when the needle valve 12 is raised, the molten lead 9 in the melting pot 7 reaches the valve seat 1.
The molten metal flows out from the hole 11 of 0, passes through the pouring groove 14 of the pouring spout 13, and is poured into the runner 5 of the mold 3 and the strap recess 4. The amount of molten lead 9 to be injected may be set in advance using a timer or the like, and when the set time is over, the needle valve 12 is lowered and comes into close contact with the valve seat 10 to stop the molten lead 9 from flowing out. Immediately after the injection of molten lead 9 is completed, the plate group 1 is lowered and the plate lug 2 is immersed in the molten lead in the strap recess 4. After a certain period of time, when the plate group 1 is raised, a strap 15 with runner lead 16 integrated therein is formed on the plate lug 2, as shown in FIG.

The present invention is characterized in that a strap with runner lead is formed as shown in FIG. This will be explained using FIG. During operation of the strap forming device, problems with poor strap thickness may occur due to lead oxide adhering to the hole 11 of the valve seat 10, etc.
This is the case when a certain amount of molten lead 9 is not poured into the mold 3 and a thin strap is formed.

FIG. 3 shows an example of a method for determining whether the strap 15 has a poor thickness by detecting the presence or absence of the runner lead 16 integrally formed with the strap 15. First of all, it is necessary to prevent the formation of runner lead when a strap is formed with a thinness other than the standard during the formation of the strap, and one way to do this is to prevent the formation of runner lead in the mold 3 with a runner shown in Fig. 1 according to the present invention. It is necessary to design the dimension C from the bottom of the recess 4 to the bottom of the runner 5 to be equal to or slightly larger (C≧D) than the allowable lower limit D (not shown in the figure) of the product strap thickness. Since the C value varies slightly depending on the set temperature of the molten lead, the groove shape of the runner, etc., it is desirable to obtain it experimentally. Reference numeral 17 is a commercially available photoelectric switch that detects the presence or absence of runner lead 16 and determines that it is normal if it is present, and that it is defective if it is absent.

FIG. 4 shows an example of a method for determining whether the strap has a poor thickness by inspecting the thickness of the runner lead 16 integrally molded with the strap 15. The distance E from the bottom surface 18 of the strap 15 to the electrode plate group is always constant, and as the top surface 19 of the strap 15 changes, the strap thickness changes. By measuring the distance F from the upper surface 20 of the strap 16, it is possible to determine whether the strap 15 has a poor thickness. Reference numeral 21 denotes a distance detection sensor that measures the distance F and compares it with a preset normal value to determine whether the strap is defective in thickness. If this method is adopted, the C value in FIG. 1 can be designed to be equal to or smaller than the allowable lower limit D of the product strap thickness (C≦D).

As described above, in the embodiment of the present invention, the runner lead 16 is molded integrally with the strap 15, and the thickness defect of the strap 15 is judged based on the runner lead 16. 16 protrudes from the side green of the electrode plate group, it can be easily determined, and the determination can also be performed mechanically.

[Effects of the Invention] As described above, according to the present invention, excellent advantages such as being able to easily and mechanically determine whether the thickness of the strap is defective can be achieved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a method for forming a runner leaded strap used in the method for determining the quality of a strap for a storage battery electrode plate group according to the present invention, and FIG. Figures 3 and 4 are perspective views of the main parts showing the runner leaded straps.
The figures each show an embodiment of the method for determining the quality of a strap for a battery plate group according to the present invention. 1... Plate group, 2... Plate lug, 3... Mold, 4
... recess for strap, 5 ... runner, 15 ... strap, 16 ... runner lead, 17 ... photoelectric switch, 21 ... distance detection sensor.

Claims (1)

[Claims] 1. Pour molten lead into a mold in which a concave part for the strap and a runner connected to the concave part for the strap are dug, and immerse the plate lugs of the plate group in the molten lead, so that the lugs are integrally attached to the lugs. A strap quality determination method for a group of storage battery electrode plates, characterized in that a lead-attached strap is formed, and then a defective thickness of the strap is determined by inspecting the presence or absence or thickness of a runner lead portion of the runner lead-attached strap. Method.