Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City, with a registered capital of 50 million yuan and total assets of 500 million yuan. The company has 7 business centers: boilers, deep-freezing containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 people, including 247 engineers and technicians and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was identified as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The filling process for liquid nitrogen tanks typically includes the following steps:
Preparation: Ensure that the storage tank and filling equipment are in good condition, without any damage or leaks. Check that the insulation layer of the tank is intact and undamaged.
Safety Inspection: Check the tank and its surrounding environment for safety. Ensure there are no flammable materials or other hazardous items in the vicinity of the tank.
Connect equipment: Link the filling equipment to the storage tank. Ensure the connection is securely fastened and leak-free.
Prepare Liquid Nitrogen: Prepare liquid nitrogen supply, ensuring the quality and purity meet the requirements.
Open Valves: Follow the operating instructions for the filling equipment, gradually open the corresponding valves to allow liquid nitrogen to flow from the source into the storage tank.
Regulate Flow: Adjust the flow control valve of the filling equipment as needed to control the inflow speed of liquid nitrogen. Ensure the flow rate is moderate, avoiding too fast or too slow.
Level Monitoring: Monitor the liquid nitrogen level in the storage tank in real-time through a level gauge or other level monitoring devices. Ensure the level remains within the safe range.
Discontinue Filling: Close the valve of the filling equipment when liquid nitrogen fills the tank or reaches the desired level, ceasing the inflow of liquid nitrogen.
Disconnect connection: Disconnect the filling equipment from the tank and ensure there are no leaks at the connection point.
Safety Inspection: Recheck the tank and its surrounding environment for safety, ensuring there are no leaks or other safety hazards.
Please note that the process described is for general reference only, and the actual filling process may vary depending on the specific type of tank and filling equipment. When performing filling operations for liquid nitrogen tanks, please adhere to the relevant operational specifications and safety requirements, and ensure that the operators are properly trained and skilled in safety procedures.

To ensure the quality of liquid oxygen tanks, the following measures can be taken:
选择可靠的供应商：选择有资质和经验的储罐制造商或供应商，确保其具备良好的声誉和可靠的质量管理体系。
Adhere strictly to relevant standards and regulations: The design, manufacturing, and installation of liquid oxygen storage tanks should comply with relevant standards and regulations, such as standards, industry standards, or.
Quality Control and Inspection: Strict quality control and inspection are conducted throughout the manufacturing process, including raw material inspection, process monitoring, and finished product testing. Ensure that the materials, welding, and sealing of the storage tanks meet the required standards.
A comprehensive quality management system: Establish and implement a comprehensive quality management system, including quality control plans, quality inspection records, and quality training, to ensure that every stage meets quality requirements.
Regular maintenance and inspections: Perform regular maintenance and inspections on liquid oxygen storage tanks, including cleaning, coating protection, and anti-corrosion treatment, to extend the lifespan of the tanks and maintain their optimal working condition.
Safety Operations and Management: Establish and implement safety operations and management systems, including proper use of storage tanks, operational procedures, and safety training, to ensure the safety and reliability of the tanks during use.
Regular inspections and evaluations: Conduct regular inspections and evaluations of liquid oxygen storage tanks, including visual inspections, pressure tests, leak detection, and as required, non-destructive testing and material analysis to ensure the tank's quality and safety.
By implementing these measures, the quality, reliability, and safety of the liquid oxygen storage tanks can be effectively ensured, meeting usage requirements and standards.

Prior to using the liquid oxygen storage tank, the following preparations must be made:
Safety Inspection: Ensure the tank and its surrounding environment are safe. Check for any damage, leaks, or other potential hazards to the tank. Make sure there are no flammable materials or other hazardous items nearby.
Tank Preparation: Inspect the tank's exterior, including the shell, welds, valves, and fasteners. Ensure there are no visible damages or corrosion. Check that the insulation layer is intact and undamaged.
Liquid Oxygen Filling: Utilize liquid oxygen transport equipment to fill the storage tank. Ensure that the flow rate and pressure of liquid oxygen are maintained within safe limits during the filling process.
Pressure Control: Storage tanks should be equipped with pressure control devices to ensure the internal pressure of the tank remains within a safe range. Inspect and adjust the pressure control devices to ensure they are functioning properly.
Valve Operation: Inspect the tank valves and connections for proper functioning. Ensure the valves open and close smoothly and reliably. Adjust the valve's open and close status as required.
Safety Equipment: Inspect the safety equipment around the storage tank, such as fire isolation zones and alarm systems, to ensure they are functioning properly.
Operator Training: Ensure operators are proficient in the safe operation of liquid oxygen storage tanks.

The cooling process and precautions for liquid argon cylinders are as follows:
Cooling Process Analysis:
Ensure clean tank: Before cooling the liquid argon tank, make sure the interior is clean and free of impurities and contaminants. Use an appropriate cleaner for washing and rinse thoroughly.
Drainage and Exhaust: To empty the gas inside the tank and expel it through the exhaust system to reduce the gas content within the tank.
Add Liquid Nitrogen: Inject liquid nitrogen into the tank, which can rapidly cool the air and walls inside the tank, thereby reducing the tank's temperature.
Allow to cool: Liquid nitrogen will gradually lower the temperature inside the tank through the process of heat conduction until it reaches the required low temperature.
Cautionary Notes:
Safety Protection: Necessary safety precautions must be taken during the cooling process of liquid argon cylinders. Liquid argon has low temperatures and high flammability, so operators should wear protective suits, gloves, and other personal protective equipment to ensure safe operation.
Fire precautions: Liquid argon is highly flammable, so during the cooling process of the liquid argon tank, it is essential to ensure there are no ignition sources nearby and to have appropriate fire extinguishing equipment on hand.
Temperature Control: During the cooling process of the liquid argon cylinder, it is necessary to control the cylinder's temperature to prevent overcooling or insufficient cooling. Temperature sensors and a temperature control system can be used to monitor and control the cylinder's temperature.
Insulation and Heat Retention: Liquid argon cylinders are typically designed with double or multi-layer structures, filled with insulating material in the middle to minimize heat transfer and evaporation of the liquid argon. Ensure the integrity and excellent insulating properties of the insulation layer.
Our company places great emphasis on technological innovation and research and development. We possess 1 municipal enterprise technology center in Heze City, with facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. We are equipped with over 600 pieces of equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and other instruments. The key products and technologies we have developed, such as temperature and pressure vessel welding, biomass boiler emission reduction, and waste heat utilization, have successively been shortlisted for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have cumulatively obtained 27 authorized utility model patents, 16 authorized invention patents, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic container processing technology using the internationally recognized plasma arc + wire filling tungsten inert gas arc welding (PAW-GTAW) technology. This technology has been appraised as reaching international standards in the field of deep cryogenic container manufacturing at the provincial level. Choose Zhongjietech, let's create brilliance together!