Continuous casting and rolling process for lanthanum-silver-lead alloy strip

Abstract

The invention discloses a continuous casting and rolling process for a lanthanum-silver-lead alloy strip, and relates to the technical field of continuous casting and rolling of lead alloy strips. The method comprises the steps that firstly, electrolytic lead is added into a continuous casting machine, and the temperature is increased to 540-560 DEG C; the temperature is 560-580 DEG C after stirring is finished, adding caustic soda flakes, stirring, and fishing out lead slag; continuing to oxidize and stir, raising the temperature to 580-600 DEG C, and then fishing out the slag; the rotating speed is adjusted to 800-1000 r / min, calcium-aluminum alloy and tin ingots are added for stirring, silver-lead alloy is added for continuous stirring, lanthanum alloy is added for stirring, a sample is sampled and tested to be qualified, stirring is continued, and the temperature is reduced to 440-500 DEG C for standby application. According to the method, alloy uniformity is ensured by means of staged melting and sequential alloy adding and in combination with gradient heating and fractional slag salvaging, the lead belt mesh belt obtained through the preparation process is free of air holes and slag inclusion, the corrosion resistance is obviously better than that of a gravity casting plate grid, the cycle performance of the manufactured battery is improved by 15% or above, and the service life of the battery is prolonged. And the active material of the positive plate does not soften and fall off during the battery life cycle, so that the service life of the starting battery is effectively prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lead alloy strip continuous casting and rolling, and particularly relates to a continuous casting and rolling process of lanthanum-silver-lead alloy strip. BACKGROUND

[0002] The grid manufacturing is an important link in the manufacturing process of lead-acid storage batteries, and a traditional grid manufacturing method is to use a grid casting machine to produce the grid, which has low production efficiency, high energy consumption and high pollution. In order to realize clean production of lead-acid storage batteries, a cold processing technology of the grid is developed. That is, after lead alloy is made into lead strip through continuous casting and rolling, the lead strip is cold processed through punching, which reduces lead smoke and lead dust, and the generated grid has excellent mechanical properties and super corrosion resistance, and thinner grid can be used to replace the traditional cast grid to save lead. The prerequisite for the cold processing of the lead alloy grid is the continuous manufacturing of the lead alloy strip.

[0003] However, in the prior art, the production of the lead alloy strip still has the following bottlenecks. The insufficient stirring in the melting stage leads to alloy segregation, which affects the mechanical properties of the lead strip, and the uneven cooling of the lead strip after forming easily causes thermal stress deformation. SUMMARY

[0004] The purpose of the present application is to provide a continuous casting and rolling process of lanthanum-silver-lead alloy strip, which ensures the uniformity of the alloy by melting in stages and sequentially adding the alloy, and solves the problems raised in the prior art by combining gradient heating and staged slagging.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] The present application is a continuous casting and rolling process of lanthanum-silver-lead alloy strip, comprising:

[0007] Step 1, the raw materials are put into the continuous casting machine for stirring and melting;

[0008] Step 2, the slag on the surface of the lead liquid is lifted, the lead liquid is introduced into the forming machine forming through the lead pump and the lead conveying pipe, the lead conveying pipe is preheated 30 minutes before the lead pump is started, the lead conveying pipe heating device is started, the heating temperature is 360-420 DEG C, after the lead strip is formed, the formed lead strip is cooled through the saponification liquid cooling system, the saponification liquid concentration is kept stable at 1.35%-1.75%, and the saponification liquid temperature is lower than 25 DEG C;

[0009] Step 3, the formed lead strip is continuously rolled on the rolling machine, and the rolled lead strip is obtained after rolling;

[0010] Step 4, after the lead strip is completed by the winding machine, it is naturally cooled, the lead strip to be punched is placed on the unwinding machine, and the punch is started to punch the lead strip.

[0011] The continuous casting and rolling process realizes the continuous production of lead alloy strip as a whole, ensures the flowability of lead liquid through the preheating lead conveying pipe, avoids blockage, and ensures the rapid and uniform cooling of the lead strip forming through the saponification liquid cooling system, thereby reducing thermal stress deformation.

[0012] Further, the raw material includes 0.02%-0.04% flake alkali, 0.1-0.2% calcium-aluminum alloy, 1.25-1.30% tin ingot, 0.02-0.04% silver-lead alloy, 0.01-0.02% lanthanum alloy, and the balance of electrolytic lead. The addition of multiple components optimizes the flowability and alloy uniformity of the lead liquid, the lanthanum alloy enhances the hardness and corrosion resistance of the lead strip, and the overall mechanical properties of the lead strip are improved, thereby prolonging the service life of the product; the impurity content is reduced, and the lead strip is more suitable for high-precision cold punching.

[0013] Further, the step 1 includes: first adding electrolytic lead into the continuous casting machine and heating to 540-560℃; adding flake alkali and stirring for 25-35min, and then removing the lead slag; after the stirring is completed, the temperature is 560-580℃; continuing to oxidize and stir for 8-10min, and then removing the slag after heating to 580-600℃; adjusting the rotating speed to 800-1000r / min, adding calcium-aluminum alloy and tin ingot and stirring for 10min, adding silver-lead alloy and continuing to stir for 90min, adding lanthanum alloy and stirring for 60min, and then sampling and testing to be qualified, and continuing to stir and cooling to 440-500℃ for standby; the step-by-step heating and stirring ensures complete melting and slag removal, and avoids composition segregation; the order of adding the alloy optimizes the reaction kinetics.

[0014] Further, the rolling mill includes seven rolling mills arranged along the lead strip conveying direction, and the lead strip between adjacent two rolling mills is in a straightened state; the thickness of the lead strip after rolling by the seven rolling mills is 14±0.3mm, 9.1±0.05mm, 5.7±0.05mm, 3.1±0.05mm, 1.95±0.05mm, 1.35±0.05mm, 1.05±0.05mm, H±0.05mm, respectively; H is a process set value, and H<1.05; the multi-pass rolling mill and the straightened state design eliminate lead strip wrinkles or uneven tension, and ensure the smoothness of continuous rolling.

[0015] Further, the saponification liquid cooling system comprises a saponification liquid storage tank and a cooling groove for the lead belt to pass through; a guide roller for controlling the lead belt to pass below the liquid level of the saponification liquid is further installed in the cooling groove, the saponification liquid storage tank is installed above the guide roller, one side of the saponification liquid storage tank is provided with a liquid discharge pipe, the saponification liquid discharged from the liquid discharge pipe flows to the surface of the guide roller; the bottom of the cooling groove is further connected with a liquid return pump through a water return pipe, the liquid return pump is connected with the saponification liquid storage tank through a pipeline; the guide roller (20) controls the lead belt to be immersed below the liquid level of the saponification liquid, and ensures overall cooling; the liquid discharge pipe (11) and the liquid return pump (3) realize saponification liquid circulation, avoid waste, and improve the utilization rate of saponification liquid.

[0016] Further, the saponification liquid cooling system comprises a saponification liquid storage tank and a cooling groove for the lead belt to pass through; a guide roller for controlling the lead belt to pass below the liquid level of the saponification liquid is further installed in the cooling groove, the saponification liquid storage tank is installed above the guide roller, one side of the saponification liquid storage tank is provided with a liquid discharge pipe, the saponification liquid discharged from the liquid discharge pipe flows to the surface of the guide roller; the bottom of the cooling groove is further connected with a liquid return pump through a water return pipe, the liquid return pump is connected with the saponification liquid storage tank through a pipeline; the guide roller (20) controls the lead belt to be immersed below the liquid level of the saponification liquid, and ensures overall cooling; the liquid discharge pipe (11) and the liquid return pump (3) realize saponification liquid circulation, avoid waste, and improve the utilization rate of saponification liquid.

[0017] Further, the saponification liquid storage tank is internally provided with a liquid level sensor A, a temperature sensor and a concentration detection mechanism; the top of the saponification liquid storage tank is provided with a water supply pipe and a saponification liquid supplement pipe, and the bottom is provided with a saponification liquid discharge pipe; the liquid level sensor A, the temperature sensor and the concentration detection mechanism are all connected with a controller, and the saponification liquid discharge pipe, the water supply pipe and the saponification liquid supplement pipe are all provided with metering valves; the sensors and the metering valves realize automatic monitoring and adjustment of the liquid level, temperature and concentration, and ensure that the parameters of the saponification liquid are stably kept in a set range.

[0018] Further, the concentration detection mechanism comprises a telescopic cylinder vertically installed on the top of the saponification liquid storage tank, the end of the telescopic cylinder is connected with a connecting rod through a tension sensor, the end of the connecting rod is connected with a cylinder body, the top of the cylinder body is provided with an opening, and the inside of the cylinder body is provided with a liquid level sensor B; the liquid level sensor B and the telescopic cylinder are both connected with a controller, the bottom end of the cylinder body is provided with a liquid discharge port, the outer circumferential side of the cylinder body is provided with a convex ring, the convex ring is connected with a movable plate for sealing the liquid discharge port through at least two elastic telescopic rods, and the circumferential side of the movable plate is provided with a guide hole; the inner top side of the saponification liquid storage tank is provided with a limiting rod, the end of the limiting rod is connected with a guide rod matched with the guide hole, and the diameter of the guide hole is smaller than that of the limiting rod; the telescopic cylinder and the cylinder body are designed to realize automatic sampling and measurement of the concentration.

[0019] Further, the water inlet end of the water return pipe is provided with an anti-blocking filter, the anti-blocking filter prevents impurities from entering the liquid return pump, ensures smooth circulation of the saponification liquid, prolongs the service life of the equipment, and reduces the frequency of shutdown cleaning.

[0020] The present application has the following beneficial effects:

[0021] The present application ensures the uniformity of the alloy by melting in stages and adding the alloy in sequence, and combining gradient heating and multiple tapping, the lead belt net prepared by the preparation process of the present application is free of pores and slag inclusion, and the corrosion resistance is obviously superior to that of the gravity casting grid, and the cycle performance of the battery manufactured is improved by more than 15%, and there is no softening and falling phenomenon of the positive plate active material during the battery life cycle, effectively improving the service life of the starting battery.

[0022] Of course, implementing any product of the present application does not necessarily require achieving all the advantages described above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the description of the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 The saponification liquid cooling system architecture diagram of the present application;

[0025] Figure 2 The saponification liquid storage tank structure schematic diagram of the present application;

[0026] Figure 3 The saponification liquid storage tank structure schematic diagram of the present application; Figure 2 The local enlarged view of A in the middle;

[0027] In the drawings, the component list represented by each number is as follows:

[0028] 1-saponification liquid storage tank, 2-cooling tank, 3-liquid return pump, 11-liquid discharge pipe, 12-water supply pipe, 13-soap solution supply pipe, 14-soap solution discharge pipe, 20-guide roller, 101-telescopic cylinder, 102-connecting rod, 103-cylinder, 104-opening, 105-liquid discharge port, 106-convex ring, 107-elastic telescopic rod, 108-movable plate, 1081-guide hole, 109-limiting rod, 1091-guide rod. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0030] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0031] Example 1: This invention relates to a continuous casting and rolling process for lanthanum-silver-lead alloy strips, comprising:

[0032] Step 1: Add electrolytic lead to the continuous casting machine and heat to 540-560℃; add caustic soda flakes, stir for 25-35 minutes, remove lead slag, and after stirring, the temperature is 560-580℃; continue oxidation and stirring for 8-10 minutes, heat to 580-600℃ and remove slag again; adjust the speed to 800-1000 r / min, add calcium-aluminum alloy and tin ingots and stir for 10 minutes, add silver-lead alloy and continue stirring for 90 minutes, add lanthanum alloy and stir for 60 minutes, take a sample for testing and if it passes, continue stirring and cool to 440-500℃ for later use;

[0033] Step 2: 30 minutes before starting the lead pump, preheat the lead conveying pipe and start the lead conveying pipe heating device to a temperature of 360-420℃. Then, remove the slag from the surface of the lead liquid and guide the lead liquid into the forming machine through the lead pump and lead conveying pipe to form lead strips. After the lead strips are formed, the formed lead strips are cooled by the saponification liquid cooling system to keep the saponification liquid concentration stable at 1.35%-1.75% and the saponification liquid temperature below 25℃.

[0034] Step 3: The formed lead strip is continuously rolled on a rolling mill to obtain the rolled lead strip.

[0035] Step 4: After the lead strip is wound up by the winding machine, it is naturally cooled. After cooling, the lead strip to be punched is placed on the unwinding machine, and the punching machine is started to perform cold punching of the lead strip.

[0036] The raw materials mentioned above include 0.02%-0.04% caustic soda flakes, 0.1%-0.2% calcium-aluminum alloy, 1.25%-1.30% tin ingots, 0.02%-0.04% silver-lead alloy, 0.01%-0.02% lanthanum alloy, and the balance being electrolytic lead.

[0037] In the above, the rolling mill includes seven rolling mills arranged along the lead strip conveying direction, and the lead strip between two adjacent rolling mills is in a straightened state; the thickness of the lead strip after rolling by the seven rolling mills is 14±0.3 mm, 9.1±0.05 mm, 5.7±0.05 mm, 3.1±0.05 mm, 1.95±0.05 mm, 1.35±0.05 mm, 1.05±0.05 mm, and H±0.05 mm, respectively; H is the process setting value, and H<1.05.

[0038] In order to facilitate the use of the saponification liquid cooling system to cool the formed high-temperature lead strip, facilitate subsequent cold rolling operation by the rolling mill, the saponification liquid cooling system comprises a saponification liquid storage tank 1 and a cooling tank 2 for the lead strip to pass through, and a guide roller 20 for controlling the lead strip to pass below the liquid level of the saponification liquid is further installed in the cooling tank 2. The saponification liquid storage tank 1 is installed above the guide roller 20, and a liquid discharge pipe 11 is arranged on one side of the saponification liquid storage tank 1. The saponification liquid discharged from the liquid discharge pipe 11 flows to the surface of the guide roller 20. The saponification liquid flows along the guide roller 20 to the upper surface of the lead strip, and then, under the blocking operation of the guide roller 20, the saponification liquid on the upper surface of the lead strip flows from both sides of the lead strip to the cooling tank 2. The present application ensures that the lead strip fully contacts the saponification liquid through the guide roller 20.

[0039] In order to facilitate the use of the saponification liquid circulation and improve the utilization rate of the saponification liquid, a backwater pipe is further connected to a back liquid pump 3 at the bottom of the cooling tank 2. A backwater pipe inlet end is provided with an anti-blocking filter. The back liquid pump 3 is connected to the saponification liquid storage tank 1 through a pipeline, and a condensation tower for cooling the saponification liquid is further arranged between the back liquid pump 3 and the saponification liquid storage tank 1.

[0040] Based on the above, in order to avoid high-temperature failure and high concentration of the saponification liquid, a liquid level sensor A, a temperature sensor and a concentration detection mechanism are arranged in the saponification liquid storage tank 1. The temperature and concentration of the saponification liquid in the saponification liquid storage tank 1 are detected by the temperature sensor and the concentration detection mechanism.

[0041] In order to facilitate the adjustment of the temperature and concentration of the saponification liquid in the saponification liquid storage tank 1 according to the detection results, a water supplement pipe 12 and a saponification liquid supplement pipe 13 are arranged on the top of the saponification liquid storage tank 1, and a saponification liquid discharge pipe 14 is arranged at the bottom. The saponification liquid discharge pipe 14, the water supplement pipe 12 and the saponification liquid supplement pipe 13 are all provided with metering valves. The metering valves, the liquid level sensor A, the temperature sensor and the concentration detection mechanism are all connected to a controller. When the temperature of the saponification liquid in the saponification liquid storage tank 1 is high, the high-temperature saponification liquid is first discharged from the saponification liquid storage tank 1 through the saponification liquid discharge pipe 14, and low-temperature saponification liquid is simultaneously supplemented into the saponification liquid storage tank 1 through the saponification liquid supplement pipe 13. According to the detection results of the metering valves, the same amount of saponification liquid is discharged through the saponification liquid discharge pipe 14 and supplemented through the saponification liquid supplement pipe 13.

[0042] When it is detected that the concentration of the saponification liquid in the saponification liquid storage tank 1 is high, the corresponding amount of water is supplemented into the saponification liquid storage tank 1 through the water supplement pipe 12 according to the detected concentration value.

[0043] Specifically, in order to facilitate detection of the concentration of the saponification liquid in the saponification liquid storage tank 1 during use, the concentration detection mechanism comprises a telescopic cylinder 101 vertically installed on the top of the saponification liquid storage tank 1, a connecting rod 102 connected to the end of the telescopic cylinder 101 through a tension sensor, an end of the connecting rod 102 connected to a barrel 103, an opening 104 provided on the top of the barrel 103, a liquid level sensor B provided in the barrel 103, the liquid level sensor B and the telescopic cylinder 101 both connected to a controller, a liquid discharge port 105 provided at the bottom end of the barrel 103, a convex ring 106 provided on the outer periphery of the barrel 103, an active plate 108 connected to the convex ring 106 through at least two elastic telescopic rods 107 to block the liquid discharge port 105, a guide hole 1081 provided on the periphery of the active plate 108, a limiting rod 109 provided on the top side of the saponification liquid storage tank 1, a guide rod 1091 connected to the end of the limiting rod 109 to cooperate with the guide hole 1081, and the diameter of the guide hole 1081 is smaller than the diameter of the limiting rod 109.

[0044] The working principle of the concentration detection mechanism is as follows: the telescopic cylinder 101 presses down the barrel 103 to immerse into the saponification liquid, at this time, the saponification liquid enters into the barrel 103 from the opening 104, the volume of the saponification liquid in the barrel 103 is detected by the liquid level sensor B, the mass of the saponification liquid in the barrel 103 is calculated by the tension sensor, and the concentration of the saponification liquid is obtained, the concentration is analyzed to determine the concentration condition, and then the saponification liquid concentration is adjusted according to the requirement; after the detection is completed, the telescopic cylinder 101 is retracted to drive the barrel 103 to move upwards until the end of the limiting rod 109 abuts against the active plate 108, at this time, the barrel 103 and the active plate 108 are separated, and the saponification liquid in the barrel 103 is discharged from the liquid discharge port 105; at the same time, under the action of the elastic telescopic rod 107, the active plate 108 blocks the liquid discharge port 105 at the bottom of the barrel 103 when the active plate 108 does not abut against the limiting rod 109.

[0045] In the description of the present specification, the description of the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The preferred embodiments of the application disclosed above are only to facilitate the elucidation of the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments. Obviously, many modifications and variations can be made in light of the teachings above. The description is chosen and described in order to provide the best illustration of the application and its practical application to those skilled in the art and to enable those skilled in the art to best utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A continuous casting and rolling process for lanthanum-silver-lead alloy strip, characterized in that, include: Step 1: Put the raw materials into the continuous casting machine and stir and melt them; Step 2: Remove the slag from the surface of the molten lead and use a lead pump and lead pipe to guide the molten lead into the forming machine to form lead strips. Step 3: The formed lead strip is continuously rolled on a rolling mill to obtain the rolled lead strip. Step 4: After the lead strip is wound up by the winding machine, it is naturally cooled. After cooling, the lead strip to be punched is placed on the unwinding machine, and the punch press is started to perform cold punching of the lead strip. Step 1 includes: first, adding electrolytic lead into the continuous casting machine and heating it to 540-560℃; adding caustic soda flakes, stirring for 25-35 minutes, removing lead slag, and after stirring, the temperature is 560-580℃; continuing to oxidize and stir for 8-10 minutes, raising the temperature to 580-600℃ and removing slag again; adjusting the speed to 800-1000 r / min, adding calcium-aluminum alloy and tin ingots and stirring for 10 minutes, adding silver-lead alloy and continuing to stir for 90 minutes, adding lanthanum alloy and stirring for 60 minutes, taking samples for testing and testing, continuing to stir and cooling to 440-500℃ for later use.

2. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 1, characterized in that, The raw materials include 0.02%-0.04% caustic soda flakes, 0.1%-0.2% calcium-aluminum alloy, 1.25%-1.30% tin ingots, 0.02%-0.04% silver-lead alloy, 0.01%-0.02% lanthanum alloy, and the balance being electrolytic lead.

3. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 1, characterized in that, The lead pump is preheated 30 minutes before starting the lead pipe. The lead pipe heating device is then started, and the heating temperature is 360-420℃. After the lead strip is formed, it is cooled by a saponification liquid cooling system to keep the concentration of the saponification liquid stable at 1.35%-1.75% and the temperature of the saponification liquid below 25℃.

4. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 1, characterized in that, The rolling mill includes seven rolling mills arranged along the lead strip conveying direction, with the lead strip between two adjacent rolling mills in a straightened state.

5. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 4, characterized in that, The thicknesses of the lead strips after rolling by the seven rolling mills are, in order: 14±0.3 mm, 9.1±0.05 mm, 5.7±0.05 mm, 3.1±0.05 mm, 1.95±0.05 mm, 1.35±0.05 mm, 1.05±0.05 mm, and H±0.05 mm. Where H is the process setting value, and H < 1.

05.

6. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 1, characterized in that, The saponification liquid cooling system includes a saponification liquid storage tank (1) and a cooling tank (2) for the lead strip to pass through; The cooling tank (2) is also equipped with a guide roller (20) for controlling the lead strip to pass through the bottom of the saponification liquid. The saponification liquid storage tank (1) is installed above the guide roller (20), and a drain pipe (11) is provided on one side of the saponification liquid storage tank (1). The saponification liquid discharged from the drain pipe (11) flows onto the surface of the guide roller (20). The bottom of the cooling tank (2) is also connected to the return pump (3) through a return water pipe, and the return pump (3) is connected to the saponification liquid storage tank (1) through a pipeline.

7. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 6, characterized in that, A cooling device for cooling the saponified liquid is also provided between the return pump (3) and the saponified liquid storage tank (1); The cooling device includes a condenser tower and a heat exchanger.

8. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 7, characterized in that, The saponification liquid storage tank (1) is equipped with a liquid level sensor A, a temperature sensor and a concentration detection mechanism; The top of the saponification liquid storage tank (1) is provided with a water supply pipe (12) and a soap liquid replenishment pipe (13), and the bottom is provided with a soap liquid discharge pipe (14). The liquid level sensor A, temperature sensor and concentration detection mechanism are all connected to the controller, and the soap liquid discharge pipe (14), water supply pipe (12) and soap liquid replenishment pipe (13) are all equipped with metering valves.

9. The continuous casting and rolling process for lanthanum-silver-lead alloy strip according to claim 8, characterized in that, The concentration detection mechanism includes a telescopic cylinder (101) vertically installed on the top of the saponification liquid storage tank (1). The end of the telescopic cylinder (101) is connected to a connecting rod (102) via a tension sensor. The end of the connecting rod (102) is connected to a cylinder (103). An opening (104) is provided at the top of the cylinder (103), and a liquid level sensor B is provided inside the cylinder (103). The liquid level sensor B and the telescopic cylinder (101) are both connected to the controller. The bottom end of the cylinder (103) is provided with a drain port (105). A convex ring (106) is provided on the outer periphery of the cylinder (103). The convex ring (106) is connected to a movable plate (108) that blocks the drain port (105) through at least two elastic telescopic rods (107). A guide hole (1081) is provided on the periphery of the movable plate (108). A limiting rod (109) is provided on the inner top side of the saponification liquid storage tank (1). The end of the limiting rod (109) is connected to a guide rod (1091) that cooperates with the guide hole (1081). The diameter of the guide hole (1081) is smaller than the diameter of the limiting rod (109).

10. The continuous casting and rolling process for a lanthanum-silver-lead alloy strip according to claim 6, characterized in that, The return water pipe is equipped with an anti-clogging filter at its inlet end.

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