We will uphold the enterprise spirit of "customer first, pursuit of excellence", adhere to quality first and management and technological innovation, and shoulder the historical responsibility of "new ideas, new opportunities, new challenges" given to us by the times. We have accumulated a lot of resources and worked hard to meet new challenges and develop Xintiandi into a star enterprise with sustainable development and excellent competitiveness.

When it comes to choosing a tea film sealing machine, there are several crucial factors to keep in mind. Sealing speed is essential, especially if you have a high production volume. A faster machine can increase your efficiency and output. However, don't sacrifice quality for speed. Ensure that the machine can provide a consistent and reliable seal. The quality of the seal is equally important. A well-sealed package not only protects the tea but also enhances its presentation. Look for a machine that can produce tight seals without leaks or damage.   Equipment stability is another key consideration. A stable machine will operate smoothly and reduce the risk of breakdowns and maintenance issues. Check for features like sturdy construction and reliable components. Now, let's talk about some common purchase mistakes. One mistake is focusing solely on price. While it's important to stay within your budget, don't compromise on quality and functionality. Another mistake is ignoring the reputation and customer reviews of the manufacturer. Do your research and choose a reputable brand with a track record of producing reliable equipment. In conclusion, when purchasing a tea film sealing machine, pay attention to key factors such as sealing speed, sealing quality, and equipment stability. Avoid common purchase mistakes to ensure that you get a machine that meets your needs and helps your tea business succeed.

Flat Bags Pros: Portable and lightweight, making them easy to carry in a purse, backpack, or pocket. Great for on-the-go tea drinkers. Take up less storage space, which is convenient for both retailers and consumers. Cost-effective production, making them an affordable option. Can be beautifully printed with branding, tea information, and attractive designs. Cons: Offer less protection against moisture, oxygen, and other environmental factors. Tea may lose its freshness more quickly. Generally have a smaller capacity, so they may not be ideal for those who drink a lot of tea or want to buy in bulk.   Triangular Nylon Bags Pros: Allow the tea leaves to expand fully during brewing, enhancing the flavor and aroma release. Provide excellent filtration, ensuring a smooth and sediment-free cup of tea. Made from food-grade nylon, which is safe for consumption. Cons: Nylon is not as environmentally friendly as some other materials as it is not easily biodegradable. Some people may worry about the potential impact of nylon on the taste of the tea. Tend to be more expensive than traditional paper packaging.   Tea Cakes Pros: Compact and easy to store and transport, reducing the risk of damage. The porous nature of some tea cake packaging allows for slow aging and fermentation, enhancing the tea's quality over time. Can be highly collectible, with beautiful packaging and unique shapes adding to their appeal. Cons: Removing tea from a tea cake can be a bit tricky and may require a special tool. Require specific storage conditions, such as a dry and odor-free environment, to maintain their quality. Usually have a higher price point due to their production process and collectible nature.   Round Beads Pros: Adorable and eye-catching appearance, making them stand out on store shelves. Convenient for single-serving brewing, especially in offices or while traveling. Often come in airtight packaging, which helps keep the tea fresh. Cons: Have a relatively small capacity, so they may not be suitable for heavy tea drinkers. The shaping process may affect the integrity of the tea leaves to some extent. Can be more expensive due to their elaborate packaging and production. In conclusion, the choice of tea packaging shape depends on your personal preferences, usage habits, and priorities. Whether you value portability, brewing experience, collectibility, or freshness, there is a tea packaging shape out there that can meet your needs. Consider these factors when choosing your next batch of tea to ensure you get the best possible product.

During the use of the cooling fan, the influence of humidity on the life of the fan cannot be ignored. Especially in industrial and household appliances, such as air conditioning cross-flow fans, cross-flow cooling fans and metal cross flow fans, humidity will not only affect the efficiency of heat dissipation, but also may adversely affect the internal structure of the fan. How does humidity affect the life of the cooling fan? High humidity environments pose multiple challenges to the motors, bearings and metal components inside cooling fans. High humidity may cause internal fan components to rust or corrode. In particular, fans with metal shells or internal components, such as metal cross flow fans, are more susceptible to humidity.     Chungfo's way of coping In order to deal with the potential threat of humidity to the life of the fan, Chungfo strictly selects moisture-proof and rust-proof materials in the design and manufacturing process of the fan. For example, Chungfo's cross flow fan in air conditioners pay attention to corrosion resistance in the selection of materials, and have passed a number of humidity tests to ensure their long-term operation in high-humidity environments such as air conditioning equipment. Our cross-flow cooling fans are also designed with a moisture-proof seal structure, which effectively prevents moisture from entering the motor part, further extending the life of the fan.     Humidity has a profound impact on the life of cooling fans, especially for products such as metal cross-flow fans, cross flow cooling fans and air conditioning cross-flow fans that are exposed to high humidity for a long time. By selecting high-quality anticorrosive materials and conducting rigorous humidity life testing, Chungfo provides customers with more durable and reliable cooling fan products.

Introduction Today, bridge mills are an indispensable tool for manufacturers in industries like aerospace, automotive, energy, and heavy machinery. Bridge mills are increasingly used as engineering designs become more complex and the need for enhanced stability, precision and flexibility to machine large and heavy workpieces to extremely tight tolerances continues. As a rigid overhead bridge structure with multi axis capabilities, bridge mills offer high precision cutting compared to traditional knee mills or gantry mills. In this article, we will look at how bridge mills can produce continuous production of complex components that can’t be made with smaller machines. Whatever your R&D work or high volume manufacturing needs, bridge mills provide a flexible solution to maximize productivity and minimize errors.   What is a Bridge Mill? A bridge mill uses a huge overhead bridge assembly to support the spindle and worktable instead of a column or gantry. The spindle is held as it moves in X, Y, and Z axes by the bridge as a rigid support arm and the worktable below is positioned relative to the cutting tool. This overhead arrangement leaves the entire area beneath the bridge open for oversized parts and assemblies, allowing much larger workpieces than could fit on a traditional vertical mill. Bridge mills derive their name from the bridge-shaped beam that spans the work area. The key components of a bridge mill are: ● Bridge - The large overhead beam that supports the spindle slide and provides damping against vibrations. It contains the mechanisms to position the spindle in X and Y. ● Spindle - The rotating shaft that holds the cutting tool. It is powered by a motor inside the spindle slide with up to 50 hp. High torque spindles allow fast removal of material. ● Table - The large stationary or moving platform that supports the workpiece. It provides a precision mounting surface and T-slot holds for clamps and fixtures. ● Column - A fixed vertical member at one end that helps support the bridge. The column may house controls or services. ● Saddle - The moving transverse component mounted to the underside of the bridge. It positions the spindle slide in the Y-axis across the width of the table. ● Spindle Slide - The carriage assembly that traverses back and forth along the bridge in the X-axis, positioning the spindle over the workpiece. Compared to gantry or knee mills, bridge mills are significantly heavier and bulkier, with a main bridge that is much more rigid thanks to its continuous cast iron or welded steel overhead design. This mass and stability is crucial for absorbing cutting forces and dampening vibration that could compromise precision. The rigid construction also minimizes deflection of the spindle during aggressive material removal, enabling much tighter tolerances. When machining large components made of tough materials like steel or titanium, the stability of a bridge mill is vital to achieve chatter-free results. Their overhead configuration also allows practically unlimited workpiece sizes.   Types of Bridge Mills   Bridge mills are available with different axis configurations and levels of automation to suit a wide range of applications: 2-Axis Bridge Mills The simplest bridge mill design has two linear axes allowing motion in the X (longitudinal) and Y (transverse) directions. This provides positioning of the workpiece beneath the spindle for basic 2D operations like facing, drilling, boring, and end milling of flat surfaces. While limited in versatility, 2-axis bridge mills are an affordable option for high-volume production of large but basic parts, as their range of motion is sufficient for straightforward machining. 3-Axis Bridge Mills A 3-axis bridge mill adds a Z-axis that raises and lowers the spindle vertically. This permits angled milling operations like helical interpolation, allowing the machining of bevels, tapers, contours, and angled features. The additional axis provides the ability to machine in 3 dimensions instead of just 2. Manufacturers gain greater flexibility to produce more complex components with a 3-axis bridge mill. 5-Axis Bridge Mills On a 5-axis bridge mill, the spindle head tilts and rotates on two additional rotary axes in addition to moving linearly in X, Y, and Z. This enables the spindle to approach the workpiece from practically any orientation rather than just vertically. 5-axis motion facilitates high-precision machining of complex 3D surfaces and contours in a single setup, saving tremendously on time and cost. Many aerospace and impeller components require 5-axis milling due to their intricate blended or sculpted geometries. Automated Bridge Mills Modern computer numerical control (CNC) bridge mills allow all machining operations to be precisely programmed ahead of time. This allows push-button automation of repetitive cutting procedures with minimal operator intervention. The computer control precisely choreographs and executes tool paths for mass production. Automated tool changers, pallet changers, and robotic part load/unload systems can further enhance productivity for lights-out manufacturing across multiple shifts.   Key Features and Components of Bridge Mills  Massive Work Area The cantilevered overhead design of a bridge mill leaves the entire area beneath the spindle open for oversized parts and assemblies. Common table sizes range from 5 x 10 ft up to 20 x 60 ft for gigantic components weighing over 100 tons. Huge motors drive the table through precision roller or hydrostatic ways. This expansive work zone minimizes setups by allowing batch machining of multiple large parts or entire weldments in a single fixture. Rigid Bridge Assembly Weighing up to 100,000 lb, the continuous overhead bridge utilizes a rigid box-way construction that resists deflection and damps vibration far better than jointed column or gantry mills. This stability prevents tool chatter, allows heavier cuts, and enables highly accurate motion of the spindle carriage across wide spans. Even minimal vibration can degrade precision and surface finish. Powerful Spindles High torque spindles up to 50 hp are common on bridge mills to power through hard alloys and remove material quickly from large parts. Higher rotational speeds up to 15,000 rpm provide ideal cutting speeds for optimized tool life and surface finish. The spindle cartridge is preloaded for thermal stability and minimal runout. Precise Positioning Ballscrews on the X, Y, and Z axes have high lead precision for accurate positioning and repeatability within 0.001”. Backlash is eliminated through preloading. Precision ground box ways or linear guides maintain tight geometrical tolerances when moving heavy components. Multi-axis Capability Optional rotary axes expand the range of possible milling operations by allowing angled cuts and 5-axis interpolated motion. Tilting the spindle facilitates machining of complex 3D contours, sculpted surfaces, and intricate blade geometries in a single setup. Automated Features Bridge mills equipped with CNC, tool changers, pallet shuttles, robotic part handling, automatic lubrication, and more enable lights-out manufacturing for maximum productivity. Hundreds of parts can be machined without operator intervention across multiple shifts.   Applications of Bridge Mills   Aerospace Industry Aircraft construction relies on large monolithic components like wings, frames, and bulkheads milled from aluminum, titanium, or composites. Landing gear, turbines, transmission housings, and other assemblies also demand high precision. Bridge mills offer the work envelope and accuracy needed for these high-value aerospace components with delicate instrumentation. Automotive Industry Automakers machine engine blocks, cylinder heads, crankshafts, transmission cases, axles, wheels, and body components from large steel or aluminum castings and weldments. Bridge mills maintain tight tolerances on these heavy parts while removing material quickly. Their high rigidity suits the noisy environment. Heavy Machinery Massive excavator booms, bulldozer track links, hydraulic cylinders, press frames, and other oversize parts require stable bridge mills to withstand vibrations inherent in heavy machining. They excel at removing substantial material from thick castings and fabrications. Mold Making Larger injection molds, die cast dies, and foundry patterns demand the precision of bridge mills to accurately produce contoured cavities without distortion. Their work volume readily accommodates even enormous 400-ton plastic or metal molds. Tight process control optimizes molded part quality. Energy Industry Turbines, compressors, reactors, valves, offshore platform components, and more leverage the long travels and precision of bridge mills during manufacturing. The mills maintain quality standards for these expensive parts operating in extreme conditions.   Benefits of Using Bridge Mills Precision The stability provided by the rigid overhead bridge enables extremely tight tolerances, even when machining large parts from vibration-prone materials like titanium or nickel alloys. Chatter is avoided, allowing smooth, accurate cuts. Versatility Available in different sizes and with varying axis configurations, bridge mills can handle a wider range of materials and part geometries compared to smaller mills. Their heavy-duty build allows machining everything from stainless steel to composites. Cost Savings While bridge mills require a greater upfront investment, they maximize productivity and minimize operating costs on large components. Their ability to consolidate several operations in one setup saves tremendously on fixtures, tooling, programming, and quality inspections. Improved Throughput Continuous cuts across expansive work zones result in shorter cycle times. Pallet changers and part loading/unloading automation further boost throughput for high-volume production across multiple shifts, improving asset utilization. Reliability Industrial bridge mills are built for round-the-clock operation in harsh conditions. They stand up to heavy use with minimal downtime. Many operate reliably for decades after proper installation, maintenance, and training.   How to Choose the Right Bridge Mill Workpiece Size Consider current and future maximum part dimensions to ensure the mill will accommodate them with room for fixturing and tooling. A too-small machine will severely limit capability. Axis Configuration The type and complexity of required milling operations determines the ideal number of axes. 5-axis mills offer the most application flexibility and reduce setups through multisided machining but are costlier. Spindle Power Ample spindle power prevents slowdowns or stalling when removing substantial material. Higher torque spindles with 15,000+ rpm allow faster hogging and finishing feeds/speeds. Ensure power meets demands. Precision Standards More expensive machines generally offer greater accuracy through more precise ballscrews, way quality, vibration dampening, and thermal stability. Evaluate precision needs carefully. Automation Plans Consider pallet changers, robotic part handling, tool changers, CNC programming, and other automation upfront rather than difficult retrofitting later. This optimizes lights-out production. Service and Support Reliable local service and technical support will maximize uptime and productivity. Ensure the machine builder has a proven reputation for quality and customer care.   Common Challenges with Bridge Mills  Vibration Control Excessive vibration during heavy duty milling can cause chatter, accuracy issues, poor surface finish, and reduced tool life. Careful fixturing, balanced tooling, adaptive feed control, and smooth ramping of spindle speed help mitigate vibrations. Thermal Effects Frictional heat during machining causes components to expand, altering dimensions. Chillers and coolant systems counteract thermal growth. CNCs can also compensate by altering cutter paths based on temperature sensors. Tool Wear Abrasive alloys quickly degrade cutting tools. Advanced tool materials, coatings, proper selection of speeds/feeds, and indexed inserts all help combat wear. In-process gauging can automatically adjust for loss of tool diameter. Maintenance Needs Bridge mills have thousands of moving components requiring regular lubrication, inspection, and service for optimal reliability. Skilled technicians should track and perform preventative maintenance. Space Constraints Bridge mills have massive footprints, heights, and weights demanding substantial floor space, reinforced foundations, and rigging equipment. Facilities must carefully plan layouts to accommodate their bulk.   Future Trends in Bridge Mill Technology Automation and AI Integration Smart machine monitoring with artificial intelligence promises even greater productivity through predictive maintenance, troubleshooting, adaptive control, and automated inspection. The mills will become self-optimizing. Multi-tasking Capability Next-generation bridge mills will incorporate turning, grinding, drilling, tapping, and other capabilities on one platform for complete production of complex parts in a single setup. Hybrid machine tools will continue gaining traction. Advanced Materials More manufacturers are adopting hard-to-machine materials like titanium, Inconel, and composites. Future spindles, tools, programming, and controls will be optimized for these exotic materials. Sustainable Design Eco-friendly lubrication systems, intelligent sleep modes, hybrid drives, and through-spindle coolant will be incorporated for energy and fluid efficiency. Bridge mills are getting greener.   Conclusion Bridge mills with their huge work areas, superb stability and multi axis flexibility allow manufacturers to increase precision, productivity and agility when making large complex parts. They are leaders in optimizing output, quality and consistency for critical aerospace, automotive and heavy industry parts. Bridge mills are a greater upfront investment, but the long term savings of reduced setups, improved workflow and increased throughput are huge. Bridge mills will only grow in strategic importance as engineering components become bigger and more sophisticated. Strong consideration should be given by companies seeking to maximize manufacturing capabilities, capacity, and competitiveness to the use of bridge mills. Their advantages are unique, enabling manufacturers to do what is not possible on smaller machines.

Curved guides and linear guides are two common types of guides. Both have support and guidance functions. Both can transfer the energy of movement to the receiving end to achieve stable movement. So what is the difference between the two? From a structural point of view, linear guides are in the shape of a straight line, and they play a role in positioning, supporting and guiding in the movement of machinery and equipment. Curved guides are a special circular structure that is widely used in hardware, automation and precision mechanical equipment, and can maintain the axis position of relative movement unchanged. From the perspective of motion trajectory, the movement mode of linear guides is linear motion driven by balls. The contact area between the balls and the guide grooves is small, so that the surface of the guide is evenly stressed and has a long life cycle. The arc guide realizes movement by the rolling of the balls on the curved surface of the guide. The curved surface of the guide bears a larger contact area, so the load capacity is higher than that of linear guides.   From the application point of view, linear guides are widely used in CNC machine tools, semiconductor equipment, medical equipment and other fields due to their linear motion characteristics. They can provide high-precision, high-rigidity and low-friction motion control, and are suitable for high-speed and high-precision linear motion requirements. Curved guides are more suitable for occasions that require curved motion or circular interpolation, such as robots, aerospace equipment, precision measuring instruments, etc. They can achieve smooth curved motion and precise circular interpolation, improving the motion performance and positioning accuracy of the equipment. The above is the difference between linear guides and circular guides. When choosing guides, users in the machinery industry should choose the appropriate guide form according to the specific usage scenarios and needs to ensure the stability and reliability of the mechanical equipment.

We are specializing in the production of metal scrap shear for metal recycling. Our container shear machine is horizontal type and it's suitable for cutting metals with different cross-sectional shapes in the cold state. Horizontal automatic container shear is very suitable for cutting metals of different cross-sectional shapes in cold state, such as round, square, slot, angle, I-shaped, plate and various scrap structural metals. It brings convenience to the packaging, storage and transportation of scrap metal materials, and also provides qualified furnace charge for smelters. Features:   The box shear machine has a wide range of applications and is a processing equipment for metal recycling stations, factory foundries and mechanical construction industries.   1.Container machine adopts hydraulic drive, you can choose manual or PLC automatic control operation. Automatic control can save human energy. 2.Production capacity up to 15 -20tons per hour 3.Eco friendly no gases required. 4.HARDOX is used as wear resistant plates 5.Blades are made up of graded tool steel for high wear resistance and long life.The scrap feed in hopper, due to the movement of pre clamp the scrap automatically slips down and the cut scrap is pushed out from the front. 6.Continuous raw material feed 7.Lesser space required. 8.The installation does not require any foundation or foot screw.

Hydraulic alligator shears are essential in various industrial fields such as scrap metal processing and manufacturing. Regular maintenance is essential to ensure the life and effectiveness of key components. This article provides a detailed guide on maintaining and servicing the main components of hydraulic alligator shears.   1. Maintaining the cutting blade Regular inspection and sharpening: Regularly check the blade for dullness or damage. Sharpen the blade as needed to ensure smooth cutting and relieve stress on the machine. Replacement: If the blade is excessively worn or damaged, replace it in time to avoid affecting the efficiency and safety of the machine. 2. Press cylinder The press cylinder is responsible for the driving force of the shear to cut the material. Seal inspection: Frequently check the hydraulic seal for wear or leakage. If necessary, replace the seal to prevent fluid leakage and maintain pressure. Rod condition: Check for wear, corrosion or misalignment on the cylinder rod. A damaged rod can lead to inefficient operation and safety hazards. 3. Press plate The press plate holds the material in place during the cutting process. Alignment check: Make sure the press plate is aligned with the cutting blade for optimal performance. Surface inspection: Check regularly for any cracks or wear, and repair or replace the platen if it is damaged. 4. Motor The motor powers the hydraulic pump and needs to be checked regularly to ensure it is operating efficiently. Cooling system: To prevent overheating, keep dust and debris out of the motor's cooling system. Electrical connections: Check all electrical connections for signs of wear or corrosion. Secure any loose connections and replace damaged wires or components. 5. Valves The pressure and flow of the hydraulic oil are managed through hydraulic valves. Operational testing: To ensure the valves are operating properly, test them regularly. Be alert for unusual sounds that may indicate potential problems. Cleaning: Keep the valves clean and free of debris buildup that can cause the valves to stick or malfunction 6. Cutting cylinders Like press cylinders, cutting cylinders are used for cutting, so similar care is required. Leakage checks: Make sure the hydraulic oil level is correct and perform regular leak checks. Pressure tests: Check the hydraulic pressure in the cutting cylinder regularly to ensure it meets the specifications required for efficient operation. 7. Pumps The machine's hydraulic oil must move, so a hydraulic pump is needed. Oil Level and Quality: Check the hydraulic oil level regularly and top up as needed. Replace the oil if it is contaminated. Pump Inspection: Listen for noise changes and check for vibrations, which may indicate wear or misalignment. 8. Electric Box The electric box contains the electrical components that control the machine. Moisture and Dirt: Make sure the electric box is free of moisture and dirt, which can cause electrical failures. Component Inspection: Frequently check all components inside the electric box for signs of wear or damage. Replace any damaged components immediately. 9. Oil Tank The oil tank stores the hydraulic oil required for the machine to operate. Cleanliness: Keep the oil tank clean and ensure that the oil is not contaminated by debris or water, which can damage the hydraulic system. Gaskets and Seals: Check the seals and gaskets that attach to the oil tank for signs of degradation or perforation and replace them accordingly. 10. General Maintenance Tips Routine Cleaning: Clean the entire machine regularly to prevent the accumulation of debris and dirt, which can affect the operation of the machine and cause premature wear. Lubrication: Apply lubricant to moving parts as directed by the manufacturer to ensure seamless function.   Regular maintenance is essential to the life, efficiency and safety of hydraulic alligator shears. Regular inspection and maintenance of components such as cutting blades, cylinders, motors and valves prevents breakdowns and optimizes performance.

TEYUN Horizontal balers are used for recycling of waste paper, plastics, PET bottles and cans. This series of balers can be configured with hoppers and can be fed with conveyors or manually according to customer needs. We can also provide engineering design and help to simplify customers' work and improve overall efficiency. Advantages The wide hopper opening is suitable for large and hollow materials. The hydraulic drive has the advantages of stable operation, high pressure and high efficiency. Good appearance, compact structure, high efficiency, simple operation, safe and reliable. The baling size can be built according to customer requirements!   Horizontal baler is also known as carton baler, waste paper strapping machine, waste paper processing equipment, the equipment is used in the normal state of waste paper and similar products extruded firm, and packaged with a special packaging tape molding, so that its volume is greatly reduced, so as to achieve the purpose of reducing the volume of transportation, saving freight costs, and increase the benefits for the enterprise. The company's waste paper baler and carton strapping machine processing equipment introduces the advanced technology and advanced process of similar products at home and abroad.   Advantages of waste paper horizontal baler: Waste paper horizontal baler has good rigidity and stability, beautiful and generous modeling, easy to operate and maintain, safe and energy-saving, low investment cost of equipment infrastructure projects and so on. It is widely used in all kinds of waste paper factories, old things recycling company and other units of enterprises, suitable for the old waste paper, plastic straw and other baling and recycling, is to improve labor efficiency, reduce labor intensity, save manpower, reduce transportation costs of good equipment.

  The following is the first part of the daily operation and maintenance of slurry pumps： tart-up and shutdown： Preparations Before Start-up： Check whether the connecting bolts and foundation bolts of the pump are loose. Check whether the piping connection is proper and whether the centers of the pump and the driver are aligned. For pumps handling high-temperature or low-temperature liquids, the expansion and contraction of the piping may cause shaft misalignment, seizure, etc. Therefore, flexible pipe joints, etc., should be used. Direct coupling and alignment. For small-sized pumps handling normal-temperature liquids, there is no problem in aligning the pump and the motor when the pump is stopped. However, for large-sized pumps handling high-temperature liquids, there is a large difference in the shaft center during operation and stoppage. To achieve correct alignment, generally heat to the operating temperature or stop the pump after the operation and quickly re-align to ensure that the shaft centers of both rotating parts are the same and avoid vibration and pump seizure. Clean the piping. Before operation, the piping must be cleaned first to remove foreign objects, welding slag, etc. from the piping. Do not let foreign objects or welding slag fall into the pump body. Install pressure gauges before and after the strainer in the suction pipe to monitor the clogging of the strainer during operation. Barring. Remove the coupling before start-up, turn the rotor by hand to observe whether there are any abnormal phenomena, and conduct a separate test run of the motor to check whether its rotation direction is the same as that of the pump. By rotating the coupling by hand, it can be found whether there are foreign objects between the impeller and the casing inside the pump. The barring should be even in weight, and there should be no abnormal noise inside the pump. Start the oil pump and check whether the bearing lubrication is good. Priming the pump. Fill the pump chamber with liquid before start-up to discharge air, liquefied gas, and steam from the suction pipe and the pump body. Start-up： The idle operation must be avoided. At the same time, open the suction valve, and close the discharge valve and each discharge hole. Open the cooling water supply valve for the bearings. If the stuffing box has a water jacket, open the cooling water supply valve of the stuffing box. If the pump handling high-temperature liquid has not reached the working temperature, open the preheating valve, and close this valve after the pump is preheated. If the pump is equipped with a liquid-sealing device, open the valve of the liquid-sealing system. If equipped with an overheating device, open the bypass valve of the self-circulation system. Start the motor. When the pump flow increases and overheating is no longer possible, close the valve of the self-circulation system. If the pump must be started with the check valve closed and the outlet gate valve open, the start-up steps are basically the same as the above method, except that the outlet gate valve should be opened for a period of time before the motor is started. Gradually open the discharge valve. Shutdown： Open the valve on the self-circulation system. Close the discharge valve. Stop the motor. If it is necessary to maintain the working temperature of the pump, open the preheating valve. Close the cooling water supply valves of the bearings and the stuffing box. If liquid-sealing is not required during the shutdown, close the liquid-sealing valve. If it is a special pump device requirement or when the pump is opened for inspection, close the suction valve, and open the vent hole and various discharge holes. Usually, the start-up and shutdown steps specified for turbine-driven pumps are basically the same as those for motor-driven pumps. Turbines have discharge valves, various drain holes, and sealing devices, which must be opened or closed before and after operation. In addition, turbines generally require preheating before start-up. Some turbines in the system are required to be started at any time, so barring operation is required. Therefore, the operator should operate according to the relevant regulations on the start-up and shutdown steps of the turbine provided by the turbine manufacturer. Maintenance During Shutdown For standby pumps at the chemical plant site, when the in-use pump fails, they should be able to be switched over in time and put into normal operation to ensure that the chemical production process is not interrupted. This requires the maintenance of the standby pumps to keep them in good condition during the standby and shutdown period. Especially for standby pumps with interlock and automatic switching, their inlet and outlet valves are open, and the pumps are filled with the medium to be transported. As long as the driver rotates, they can start working immediately. For standby pumps during the shutdown period, the quality and quantity of the lubricant should be checked frequently. The pump body and the medium inside the pump that needs to be heated and insulated should be heated and insulated. To prevent the rotor from bending due to its own weight and to prevent the shaft from adhering to the bearings and causing start-up difficulties, the standby pumps should be barring regularly. For pumps that have been shut down for a long time, open the plugs on the pump body to drain the liquid inside the pump to avoid damage to the pump body due to cold weather. If necessary, open the pump body, clean the internal parts, and apply anti-rust oil. For pumps that have been shut down for a long time, whether they are on-site or in the warehouse, they should be barring regularly. For details of the first part, please refer to the next blog post.