When welding the NGW113-560 planetary reducer frame made of cast iron, the preheating temperature has a significant regulatory effect on heat input. Increasing the preheating temperature can effectively reduce the cooling rate and reduce heat input requirements, thereby inhibiting the formation of cracks. This is because cast iron has poor thermal conductivity and low plasticity. It is easy to produce thermal stress cracks due to large local temperature differences during the welding process. Therefore, reasonable preheating can improve the thermal field distribution and reduce reliance on high heat input. 1. How does the preheating temperature affect the heat input and cooling behavior? 1. Reduce the temperature gradient and slow down the cooling rate. When the iron casting is not preheated, the initial temperature of the base metal is close to room temperature (about 20°C), and the welding arc is instantly heated to more than 1200°C, forming a huge temperature gradient, resulting in rapid cooling of the weld area and easy formation of martensite and white structure. When preheating to ‌300~350℃‌, the entire base metal is in a high temperature state, and the cooling curve after welding is gentle, ‌1200℃→800℃ Read More

To avoid the negative impact of temperature changes on the sealing performance of the ZQD400-80-1 gear reducer, measures need to be formulated around the four core dimensions of seal Selection adaptation, structural optimization, temperature control, and maintenance specifications to form a full-cycle protection system, as follows: 1. Seals that accurately Selection adapt to temperature characteristics are preferably made of sealing materials that are resistant to high and low temperatures: the oil seal lip is made of fluorine rubber (FKM) Or hydrogenated nitrile butadiene rubber (HNBR), which can withstand a wide temperature range of -20°C to 150°C and avoid low-temperature hardening and high-temperature aging; the sealing pad uses a flexible graphite composite pad or a metal-coated pad to replace ordinary rubber pads to improve temperature resistance and sealing stability. Match the sealing structure corresponding to the temperature: under high-temperature working conditions, a double-lip oil seal with a dust lip + spring preload is used to enhance lip fit; under low-temperature working conditions, a lip-coated oil seal with a low friction coefficient is used to reduce friction damage during startup. 2. Optimize structural design to resist Read More

The relevant standards for the impact of temperature changes on the sealing performance of the ZQD650-65.54-3CA gear reducer are mainly divided into three categories: general standards for reducers, seal material and performance standards, and environmental test standards. The details are as follows: 1. General technical standards for reducers JB/T 9002-2010 'Cylinder Gear Reducer': stipulates the basic parameters, technical requirements, test methods, etc. of the cylindrical gear reducer, which clarifies the sealing performance requirements of the reducer under different temperature conditions. For example, there must be no oil leakage at the seal during operation, and the impact of thermal expansion and contraction caused by temperature changes on the sealing fit must be considered to ensure that the sealing structure design can adapt to temperature fluctuations. GB/T 10095.1-2008 'Cylinder Gear Precision Part 1: Definition and Allowable Value of Tooth Surface Deviation on the Same Side of Gear Teeth': Although it mainly focuses on gear accuracy, gear accuracy is directly related to shafting assembly accuracy, and the shafting is coaxial Read More

The splash lubrication system of this type of reducer, in addition to regular oil level and oil product inspections, must focus on monitoring three major parameters: temperature, vibration and oil quality, in order to capture early signals of lubrication failure in real time and prevent damage to gears and bearings. The following are specific monitoring parameters and implementation suggestions: 1. Temperature parameters: Monitor 'key point temperature rise' and identify abnormal lubrication. The splash lubrication effect directly affects the heat dissipation capacity of bearings and gears. Abnormal temperature is often the first signal of insufficient lubrication or deterioration of oil quality. 1. Bearing end temperature: The input/output shaft bearing is the most sensitive area for lubrication. It is recommended to install a contact thermal resistance (PT100) or infrared temperature measurement device. Normal operation threshold: ≤70℃ (when the ambient temperature is ≤35℃); if the ambient temperature rises, the upper limit can be adjusted by 2℃ for every +5℃. Early warning standard: temperature rise rate ≥10℃/h, or continuously higher than 80℃, indicating possible oil shortage, bearing wear or cage failure. ‌2. Oil Read More

When the oil level is 10 mm or more below the center line of the oil level plug, the oil stirring ability of the gear during rotation is insufficient, and sufficient oil mist coverage and oil flow erosion cannot be formed. The core impact is concentrated on insufficient lubrication and increased component wear. The specific manifestations are: 1. Failure of lubrication of key friction pairs, and wear/gluing failures are prone to gear meshing surfaces: When the oil level is too low, the gear tooth top cannot be fully immersed in oil, and the amount of oil mist brought up during rotation is greatly reduced, making it difficult to form a continuous and stable oil film on the meshing surface. In the early stage, there will be slight pitting and scratches on the tooth surface. As the running time increases, the oil film will completely break down and the metal on the tooth surface will be in direct contact, causing tooth surface gluing and peeling. In severe cases, tooth fracture will occur, leading to transmission failure of the reducer. Bearing components: The lubrication of bearing rollers and raceways relies on splash oil flow flushing. When the oil level is insufficient, there is not enough oil infiltration inside the bearing end cover, and the rollers are in a boundary lubrication state. The running resistance increases, and pitting and peeling will appear on the surface of the rollers. Read More

Parallel-axis helical gear reducers have the core advantages of high transmission efficiency, strong load-bearing capacity, low operating noise, compact structure, and flexible installation methods. The parallel-axis transmission form is suitable for various horizontal and vertical general transmission scenarios, and can meet the basic needs of different industries for speed adjustment and torque amplification. It is also suitable for light, medium and heavy load conditions. It has become one of the most widely used types of reducers in the industrial field. Its applications cover general machinery, metallurgy and mining, and light industry and textiles. , logistics and warehousing, construction and building materials, food processing, chemicals and pharmaceuticals, new energy and other almost all industrial transmission scenarios. The core application areas and specific adaptation scenarios and equipment are as follows. At the same time, the characteristics of different series (such as standard, high-power, micro) are combined to match the corresponding working conditions: 1. In the field of general machinery and automation equipment, this is the most basic and extensive application scenario of parallel axis helical gear reducers, adapting to various light and medium-load, high-precision automated transmission needs, from small to micro Read More