Lead belt production line for preparing lead-acid storage battery polar plate

Abstract

The lead belt production line for preparing the lead-acid storage battery polar plate comprises a lead melting pot, a heat preservation pot and a lead storage tank which are arranged in sequence, an inner cavity of the lead melting pot is communicated with an inner cavity of the heat preservation pot through a lead conveying pipe, an overflow opening in the heat preservation pot is in butt joint with an inner cavity of the lead storage tank, and cooling pipelines of the cooling system are evenly distributed on the outer wall of the lead storage tank. The method comprises the following steps: adding lead alloy into a lead melting pot for melting, conveying the molten lead into a heat preservation pot through a lead conveying pipe after the molten lead is molten, carrying out heat preservation for a period of time, conveying the molten lead into a lead storage tank, starting a cooling system to cool the molten lead and starting an ultrasonic device to carry out ultrasonic treatment on the molten lead in the lead storage tank when a lead blank is cast. And then carrying out a cast-rolling test on a horizontal type upper and lower double-roller cast-rolling machine. The method mainly solves the problems of developed dendritic crystals, non-uniform grain sizes and rough and irregular grain boundaries in the surface microstructure of the lead belt prepared by the existing cast rolling equipment, and can refine the grains and inhibit segregation of alloy components.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-acid batteries, and in particular relates to a lead strip production line. Background Art

[0002] Lead strip is the base material for making grids. The grids are obtained by punching or expanding. The quality of lead strip determines the quality of grids. Grids are important core components of lead-acid batteries. The conductivity, corrosion resistance and consistency of the grids have an important impact on the power performance, life and stability of the battery.

[0003] The surface microstructure of the lead strip produced by the existing casting and rolling equipment has well-developed dendrites, uneven grain size, rough and irregular grain boundaries, and some small grains. This is caused by the extrusion rheological effect of the rolling process. The grid prepared by using the existing lead strip has uneven grain size after corrosion in the battery, and the battery is prone to premature failure. Summary of the invention

[0004] In order to further improve the production and research and development efficiency, the utility model provides a lead strip production line for preparing lead-acid battery plates, which can refine grains, inhibit the segregation of alloy components, and increase the service life of the battery.

[0005] The technical scheme of the utility model is: comprising a lead melting pot, a heat preservation pot and a lead storage tank which are arranged in sequence; the inner cavity of the lead melting pot is connected with the inner cavity of the heat preservation pot through a lead conveying pipe, the overflow port on the heat preservation pot is connected with the inner cavity of the lead storage tank, the cooling pipelines of the cooling system are evenly distributed on the outer wall of the lead storage tank, and also comprising an ultrasonic device, which is installed in the upper middle part of the lead storage tank through a fixed base, and the vibration head of the ultrasonic device extends into the middle part of the inner cavity of the lead storage tank; and also comprising a roller assembly for rolling the solidified cast lead billet in the lead storage tank, the roller assembly comprising an upper roller and a lower roller arranged opposite to the upper roller.

[0006] A liquid outlet is arranged at the bottom of the lead melting pot, one end of the lead delivery pipe is connected to the liquid outlet, and a liquid inlet is arranged at the bottom of the heat preservation pot, which is connected to the other end of the lead delivery pipe.

[0007] The ultrasonic generator is used to convert the 220V50HZ power input by the protection circuit into a 15KHZ high-voltage electric wave.

[0008] The upper end of the cooling pipe is a water inlet, and the lower end of the cooling pipe is a water outlet. The water inlet is connected to a cold water pool, and the water outlet is connected to a hot water pool. The hot water pool is connected to the cold water pool via a cooler. The circulating water in the cooling pipe circulates continuously to ensure the solidification of the lead liquid.

[0009] The ultrasonic device comprises an ultrasonic transducer, an ultrasonic generator connected to the ultrasonic transducer, a protection circuit, an ultrasonic amplitude modulator, a vibration head and a fixed base.

[0010] The lead melting pot and the heat preservation pot are both provided with pumps.

[0011] The lead storage tank is provided with a discharge port on one side close to the roller assembly, and a discharge baffle is arranged at the discharge port. When the lead liquid in the lead storage tank solidifies and casts the lead billet, the discharge baffle is in an open state.

[0012] The roll gap between the upper roll and the lower roll is 8-12 mm, and the casting speed is 1.2-1.4 m / min.

[0013] A negative pressure dust suction device is arranged above the lead storage tank.

[0014] The utility model can refine the grains and inhibit the segregation of alloy components. The lead strip microstructure produced by ultrasonic casting and rolling has fine grains, regular grain boundary structure and no coarse dendrites. This is because after applying ultrasound, the solidification temperature of the metal increases, the solidification time is shortened, the temperature gradient is reduced, and the metal tends to solidify in a volume manner, thereby transforming the solidification structure from coarse columnar crystals to fine equiaxed crystals.

[0015] The utility model makes the organizational structure of the cast and rolled lead strip more uniform after applying ultrasonic waves, and obtains grain refinement and almost disappearance of dendrite structure. This is because ultrasonic waves cause cyclic motion when diffusing in the melt. This periodic motion weakens during propagation and produces a sound pressure gradient called acoustic flow. Acoustic flow strengthens the melt flow, resulting in increased grain contact. Dendrites continue to fall, refine the grains, and prevent the formation of dendrite arms and coarse dendrites. The fallen dendrites become new particle nuclei and are distributed in the melt to flow evenly, thereby reducing the space for grain growth and refining it. This new particle nucleation is transformed into a new nucleus, thereby increasing the nucleation rate. Ultrasound applied to lead liquid can play the role of stirring, atomization, dispersion, impact crushing, etc., promote alloy nucleation and hinder its growth, and can also improve the uniformity of temperature and chemical composition, inhibit the segregation of alloy components, and have certain practical reference value for battery companies to further improve production and enhance research and development. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the structure of the ultrasonic device;

[0018] Figure 3 This is a schematic diagram of the structure of the heat preservation pot

[0019] In the figure: 1. Lead melting pot; 2. Lead delivery pipe; 3. Insulation pot; 4. Lead storage tank; 5. Ultrasonic device; 6. Lead billet; 7. Upper rolling roller; 8. Lead strip; 9. Lower rolling roller; 10. Cooling system. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, all other embodiments obtained without creative work are within the scope of protection of the present utility model.

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1 , 2 As shown in Figures 3 and 4, the utility model includes: 1. lead melting pot; 2. lead delivery pipe; 3. insulation pot; 4. lead storage tank; 5. ultrasonic device; 6. lead billet; 7. upper roller; 8. lead strip; 9. lower roller; 10. cooling system. The ultrasonic device 5 is applied to the lead storage tank 4; the ultrasonic device 5 is installed in the upper middle part of the lead storage tank 4 through a fixed base 56. The structure of the ultrasonic device 5 mainly consists of the following aspects: a protection circuit 51, an ultrasonic generator 52, an ultrasonic transducer 53, an ultrasonic amplitude modulator 54, a vibration head 55, and a fixed base 56. The ultrasonic device 5 is installed in the center position just above the lead storage tank 4 through a fixed base 56. The inner cavity of the lead melting pot 1 is connected to the inner cavity of the insulation pot 3 through the lead delivery pipe 2, and the overflow port 41 on the insulation pot 3 is connected to the inner cavity of the lead storage tank 4.

[0023] When the ultrasonic device 5 is working, after the power is turned on, the 220V50HZ power input by the ultrasonic wave is converted into high-frequency electric waves through the protection circuit 51 by using the function of the ultrasonic generator 52; the function of the ultrasonic transducer 53 is to convert the electric waves generated by the ultrasonic generator 52 into mechanical motion, which is transmitted and amplified by the ultrasonic amplitude modulator 54 and transmitted to the lead liquid in the lead storage tank 4 through the vibration head 55.

[0024] The lead tape 8 includes a narrow lead tape and a wide lead tape.

[0025] The frequency output by the ultrasonic modulator 54 in the ultrasonic device 5 can be adjusted according to the casting speed of the lead billet 6. The casting speed of the lead billet 6 is generally 1-1.4 m / min. The faster the casting speed, the higher the required output frequency.

[0026] When preparing lead strip, add lead alloy to the lead melting pot 1 to melt it first, and control the temperature to 450-480℃. After the lead liquid is melted, the lead liquid is transported to the insulation pot 3 through the lead delivery pipe 2. After a period of insulation, the lead liquid is transported to the lead storage tank 4. When casting the lead billet 6, turn on the cooling system 10 to cool the lead liquid, and start the ultrasonic device to ultrasonicate the lead liquid. The working principle of ultrasonic waves is to turn on the power switch, and use the ultrasonic generator to convert the input 220V50HZ power into a 15KHZ high-voltage electric wave; then use the ultrasonic transducer to convert the high-voltage electric wave into a mechanical motion of the same frequency; transfer the mechanical motion to the lead liquid by debugging the ultrasonic modulator device; then carry out the casting and rolling test on the horizontal upper and lower double rollers 7, 9 casting and rolling mill, such as Figure 1 As shown, the roll gap is 10 mm, the casting speed is 1.2-1.4 m / min, and a lead strip 8 with a width of 300 mm and a thickness of 10 mm is cast and rolled.

Claims

1. A lead strip production line for preparing lead-acid battery plates, characterized in that: The invention comprises a lead melting pot (1), a heat preservation pot (3), and a lead storage tank (4) which are arranged in sequence; the inner cavity of the lead melting pot (1) is connected to the inner cavity of the heat preservation pot (3) through a lead conveying pipe (2); an overflow port (41) on the heat preservation pot (3) is connected to the inner cavity of the lead storage tank (4); cooling pipes of a cooling system (10) are evenly distributed on the outer wall of the lead storage tank (4); an ultrasonic device (5) is installed at the upper middle part of the lead storage tank (4) via a fixed base (56); a vibration head (55) of the ultrasonic device (5) extends into the middle part of the inner cavity of the lead storage tank (4); and a roller assembly for rolling the solidified cast lead billet in the lead storage tank (4); the roller assembly comprises an upper roller (7) and a lower roller (9) arranged opposite to the upper roller (7).

2. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: A liquid outlet is provided at the bottom of the lead melting pot (1), one end of the lead delivery pipe (2) is connected to the liquid outlet, and a liquid inlet is provided at the bottom of the heat preservation pot (3), the liquid inlet is connected to the other end of the lead delivery pipe (2).

3. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The ultrasonic generator (52) is used to convert the 220V50HZ power input by the protection circuit (51) into a 15KHZ high-voltage electric wave.

4. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The upper end of the cooling pipe is a water inlet, and the lower end of the cooling pipe is a water outlet. The water inlet is connected to a cold water pool, and the water outlet is connected to a hot water pool. The hot water pool is connected to the cold water pool via a cooler.

5. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The ultrasonic device (5) comprises an ultrasonic transducer (53), an ultrasonic generator (52) connected to the ultrasonic transducer (53), a protection circuit (51), an ultrasonic amplitude modulator (54), a vibration head (55), and a fixed base (56).

6. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The lead melting pot (1) and the heat preservation pot (3) are both provided with pumps.

7. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The lead storage tank (4) has a discharge port on one side close to the roller assembly, and a discharge baffle is installed at the discharge port. When the lead liquid in the lead storage tank (4) solidifies to cast the lead billet, the discharge baffle is in an open state.

8. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: The gap between the upper roller (7) and the lower roller (9) is 8-12 mm, and the casting speed is 1.2-1.4 m / min.

9. The lead strip production line for preparing lead-acid battery plates according to claim 1, characterized in that: A negative pressure dust suction device is provided above the lead storage tank (4).

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