Cylinder lining structure of double-screw lithium battery homogenizing equipment as well as preparation method and application of cylinder lining structure

Abstract

The invention relates to the technical field of lining structures, and discloses a barrel lining structure of double-screw lithium battery homogenizing equipment, the barrel lining structure comprises a lining body and a barrel, the lining body is made of ceramic zirconia alloy, and the lining body and the barrel are welded into a whole in a vacuum brazing mode. Ceramic zirconia alloy is used as a lining material of the cylinder. The ceramic zirconia alloy has extremely high hardness and wear resistance, the hardness of the ceramic zirconia alloy is far higher than that of common metal materials, erosive wear of slurry can be effectively resisted, and the service life of the lining is prolonged. And meanwhile, the ceramic zirconia alloy is stable in chemical property and cannot chemically react with the lithium battery slurry, so that the slurry is prevented from being polluted.

Description

Technical Field

[0001] The present invention relates to the technical field of lining structures, and in particular to a barrel lining structure of a twin-screw lithium battery homogenizing device, a preparation method thereof, and an application thereof. Background Art

[0002] In the twin-screw lithium battery homogenization equipment, the barrel lining is a key component to ensure the stable operation of the equipment and the quality of the lithium battery slurry.

[0003] Traditional metal-lined cylinders have many disadvantages: on the one hand, when metal materials are subjected to long-term high-speed stirring slurry erosion, their wear resistance is insufficient, resulting in rapid wear of the lining. Frequent replacement of the lining not only increases equipment maintenance costs, but also affects production efficiency; on the other hand, the debris generated by metal wear is easily mixed into the lithium battery slurry. Since metal debris is conductive, it will cause the conductive matter in the lithium battery to exceed the standard, seriously affecting the performance and safety of the lithium battery and reducing the product qualification rate.

[0004] In addition, the traditional lining structure also has deficiencies in thermal conductivity and impact resistance. During the homogenization process, good thermal conductivity helps to evenly transfer heat and avoid local overheating that affects the slurry quality. However, the thermal conductivity uniformity of the metal lining is poor.

[0005] At the same time, the mechanical vibration and slurry impact during equipment operation require the lining to have high impact resistance to ensure structural integrity and service life. Summary of the Invention

[0006] The purpose of the present invention is to solve the problems existing in the prior art and to propose a cylinder lining structure for a twin-screw lithium battery homogenization equipment.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A cylinder lining structure for a twin-screw lithium battery homogenizing device comprises an inner lining body and a cylinder. The inner lining body is made of a ceramic zirconium oxide alloy and is welded to the cylinder into a whole by vacuum brazing.

[0009] Preferably, the thickness of the lining body is between 3mm and 4mm.

[0010] Preferably, a transition layer is provided between the lining body and the cylinder body, and the transition layer is made of metal zirconium or nickel-based brazing material, and is metallurgically bonded with the lining body and the cylinder body during vacuum brazing, and its thickness is between 0.05mm-0.15mm.

[0011] A method for preparing a barrel lining structure of a twin-screw lithium battery homogenization device, comprising the following steps:

[0012] According to the size and shape of the twin-screw lithium battery homogenization equipment barrel, the 3-4 mm thick ceramic zirconia alloy bushing is precisely processed to ensure the dimensional accuracy and surface flatness of the bushing;

[0013] Prepare the matching cylinder parts, clean and pre-treat the cylinder surface to remove impurities and ensure brazing quality;

[0014] Assemble the ceramic zirconia alloy bushing and the cylinder according to the designed position, place them in a vacuum brazing furnace, and pump the vacuum degree in the furnace to below 2.0×10-3Pa to exclude air and moisture;

[0015] Select appropriate solder and heat according to the predetermined heating curve. The heating rate is controlled at 5-20℃ / min. When the temperature reaches near the melting point of the solder, keep it warm for about 40-50 minutes to allow the solder to fully melt and spread and fill between the components to form a strong metallurgical bond.

[0016] Finally, the vacuum brazing process was completed by cooling to room temperature at a cooling rate of 10-20°C / min.

[0017] Preferably, when the temperature reaches about 5° C. higher than the melting point of the solder, it is kept warm for about 45 minutes to allow the solder to fully melt and spread and fill between the components to form a strong metallurgical bond.

[0018] The invention discloses an application of a barrel lining structure in a twin-screw lithium battery homogenizing device, which adopts a barrel lining structure of the twin-screw lithium battery homogenizing device.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention uses a ceramic zirconia alloy as the cylinder lining material. This material possesses exceptional hardness and wear resistance, far exceeding that of common metals. This material effectively resists erosion and wear from the slurry, extending the service life of the lining. Furthermore, its chemical stability prevents chemical reactions with the lithium battery slurry, thus preventing contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the barrel lining structure of a twin-screw lithium battery homogenization equipment proposed in the present invention.

[0022] In the figure: 1. lining; 2. transition layer; 3. cylinder. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] Reference Figure 1 A barrel lining structure of a twin-screw lithium battery homogenization equipment is used in existing twin-screw lithium battery homogenization equipment. It is a key component to ensure the stable operation of the equipment and the quality of lithium battery slurry. It includes an inner lining body 1 and a barrel 3. The inner lining body 1 is made of ceramic zirconium oxide alloy and is welded to the barrel 3 as a whole through vacuum brazing. Brazing under a vacuum environment can effectively exclude air and impurities, avoid welding defects, and ensure welding quality.

[0025] In this embodiment, the thickness of the lining body 1 is between 3 mm and 4 mm. The thinner ceramic zirconia alloy layer significantly improves the thermal conductivity while maintaining the high wear resistance of the material surface. Because the ceramic layer is thinner, the heat transfer path is shortened, and heat can be conducted more quickly and evenly, which helps to improve the heat exchange efficiency during the homogenization process and avoid local overheating of the slurry.

[0026] Moreover, after being brazed into a whole, the impact resistance of the structure is significantly improved, and it can better withstand the mechanical vibration and slurry impact during equipment operation.

[0027] In this embodiment, a transition layer 2 is provided between the lining body 1 and the cylinder 3, and the transition layer 2 adopts nickel-based brazing material, which has good wettability and bonding strength, can form a metallurgical bond between the ceramic zirconia alloy and the cylinder 3, and its thickness is between 0.05mm-0.15mm.

[0028] A method for preparing a barrel lining structure of a twin-screw lithium battery homogenization device, comprising the following steps:

[0029] According to the size and shape of the barrel 3 of the twin-screw lithium battery homogenization equipment (for example, in this embodiment, it is a telescope-shaped twin-barrel design), a 3-4 mm thick ceramic zirconia alloy bushing is precisely processed to ensure the dimensional accuracy and surface flatness of the bushing;

[0030] Prepare the matching cylinder 3 parts, clean and pre-treat the surface of the cylinder 3 to remove impurities and ensure the brazing quality;

[0031] Assemble the ceramic zirconia alloy bushing and the cylinder 3 according to the designed position, place them in a vacuum brazing furnace, and pump the vacuum degree in the furnace to below 2.0×10-3Pa to exclude air and moisture;

[0032] Select appropriate solder and heat according to the predetermined heating curve. The heating rate is controlled at 5-20℃ / min. When the temperature reaches about 5℃ higher than the melting point of the solder, keep it warm for about 45 minutes to allow the solder to fully melt and spread and fill between the components to form a strong metallurgical bond.

[0033] Finally, the vacuum brazing process was completed by cooling to room temperature at a cooling rate of 10-20°C / min.

[0034] After brazing is completed, the lining structure of the cylinder 3 is fully inspected for quality, including:

[0035] Use non-destructive testing methods such as ultrasonic testing to detect whether there are defects such as pores and cracks in the brazing parts; use hardness testing, wear resistance testing and other means to detect whether the performance of the ceramic zirconia alloy bushing and the brazing parts meets the requirements; conduct trial assembly and trial operation of the finished product to check the matching accuracy and operating stability of the liner and equipment components such as the twin screw to ensure the normal operation of the equipment.

[0036] Compared with the prior art, the lining structure proposed in the present invention has the following properties:

[0037] High wear resistance: significantly improves the wear resistance of the lining, reduces the frequent replacement due to wear, reduces equipment maintenance costs, and improves production efficiency;

[0038] Improved slurry purity: Prevents metal wear materials from mixing into lithium battery slurry, effectively prevents excessive conductive materials in lithium batteries, improves lithium battery performance and safety, and increases product qualification rate;

[0039] Improved thermal conductivity: The optimized lining structure improves thermal conductivity, ensuring uniform heat transfer during the homogenization process, which is beneficial to improving slurry quality;

[0040] Enhanced impact resistance: The overall brazing structure improves the impact resistance of the lining, enhances the stability and reliability of the structure, and extends the service life of the equipment.

[0041] The experimental data are as follows:

[0042] A microcomputer-controlled fully automatic impact testing machine was used to conduct a forward impact test. The test results are as follows:

[0043]

[0044] The shear test was carried out using a microcomputer-controlled electronic universal testing machine. The test results are as follows:

[0045]

[0046] The tensile test was carried out using a microcomputer-controlled electronic universal testing machine. The test results are as follows:

[0047]

[0048] The dry sand abrasive wear test was conducted, and the test results are as follows:

[0049]

[0050] Penetrant testing, the test results are as follows:

[0051]

[0052] Bending strength test, the test results are as follows:

[0053]

[0054] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A barrel lining structure for a twin-screw lithium battery homogenization device, comprising a lining body and a barrel, characterized in that: The lining body is made of ceramic zirconium oxide alloy and is welded to the cylinder body as a whole by vacuum brazing.

2. The barrel lining structure of a twin-screw lithium battery homogenization equipment according to claim 1, characterized in that: The thickness of the lining body is between 3mm and 4mm.

3. The barrel lining structure of a twin-screw lithium battery homogenization equipment according to claim 1, characterized in that: A transition layer is provided between the lining body and the cylinder body, and the transition layer is made of metal zirconium or nickel-based brazing material, and is metallurgically bonded with the lining body and the cylinder body during vacuum brazing, and its thickness is between 0.05mm-0.15mm.

4. A method for preparing a barrel lining structure of a twin-screw lithium battery homogenization device, comprising preparing a barrel lining structure of a twin-screw lithium battery homogenization device according to any one of claims 1 to 3, characterized in that: The following steps are involved: According to the size and shape of the twin-screw lithium battery homogenization equipment barrel, the 3-4 mm thick ceramic zirconia alloy bushing is precisely processed to ensure the dimensional accuracy and surface flatness of the bushing; Prepare the matching cylinder parts, clean and pre-treat the cylinder surface to remove impurities and ensure brazing quality; Assemble the ceramic zirconia alloy bushing and the cylinder according to the designed position, place them in a vacuum brazing furnace, and pump the vacuum degree in the furnace to below 2.0×10-3Pa to exclude air and moisture; Select appropriate solder and heat according to the predetermined heating curve. The heating rate is controlled at 5-20℃ / min. When the temperature reaches near the melting point of the solder, keep it warm for about 40-50 minutes to allow the solder to fully melt and spread and fill between the components to form a strong metallurgical bond. Finally, the vacuum brazing process was completed by cooling to room temperature at a cooling rate of 10-20°C / min.

5. The method for preparing the barrel lining structure of a twin-screw lithium battery homogenization device according to claim 4, characterized in that: When the temperature reaches about 5°C higher than the melting point of the solder, keep it warm for about 45 minutes to allow the solder to fully melt and spread and fill between the components to form a strong metallurgical bond.

6. Application of a barrel lining structure in a twin-screw lithium battery homogenization device, using the barrel lining structure of a twin-screw lithium battery homogenization device according to any one of claims 1 to 3.

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