The V-belt drive can run at up to 95%-98% when installed, but even if it is properly maintained, it will deteriorate in operation, which is almost 5% lower. The poorly maintained V-belt drive efficiency will be reduced by 10 %. Synchronous drive belt energy efficiency can be maintained at around 98% throughout its life. Shown is a comparison of the efficiency of the V-belt and the synchronous belt. Synchronous belts are small even if they need to be re-adjusted due to their high tensile stress and low tensile elongation of the cord. For example, the 2450mmV belt has a center tension of approximately 381163.5mm over its life span, while the synchronous belt only needs to be tensioned 1102mm. HVAC Drive Design Considerations While HVAC applications are a natural choice for conversion to timing belt drives, care must be taken to ensure that the HVAC unit is a good choice for this type of conversion. Air conditioning equipment is usually designed by the original manufacturer and naturally adopts V belt transmission. Here are some guidelines that are easy to follow in order to identify good or bad when selecting the object of this conversion. Many air conditioning treatment devices are not particularly robust in construction. This is not a major concern for V-belt drives. However, the synchronous drive belt is sensitive to changes in the center distance caused by insufficient bracket strength. This is especially important when AC is required to provide 150%-200% rated power startup. Under these conditions, the V-belt is easy to slip, like a clutch, and is actually locked to the torque peak at start-up. However, the timing belt does not slip, but a higher starting torque must be transmitted. If the center distance is reduced to a large extent, it is enough to cause the timing belt to reverse the teeth and possibly damage the belt and the motor or fan at the same time. When checking whether a transmission can be switched to a synchronous belt, the transmission can be closed and safely braked. It is tested in a simple way: grasp the two belts in the middle of the span and push them together, paying attention to their movement. In case, be aware that there is relative motion between the motor or the center distance, and if so, most of the transmission may not be structurally strong. The structure needs to be reinforced to get the highest performance from a synchronous belt drive. A common configuration is that the motor is mounted on the fan. Proper alignment of the drive's mounting drive is critical to maintaining optimal belt performance. Synchronous belts are susceptible to misalignment and should not be used with transmissions that have their own inherent offset when the transmission is in operation. The misalignment causes the belt tension layer to be subjected to irregular loads and uneven wear and premature tensile damage. Synchronous belts are made of high-strength materials and have length stability over the life of the belt. The offset does not allow the load to be evenly distributed across the width of the top layer of the belt. On the offset transmission, only a small portion of the top width of the belt is subjected to load, resulting in reduced performance. There are two types of offset: parallel offset and angular offset. Any degree of sprocket offset will necessarily shorten the life of the belt, which is not explained in the general transmission design procedure. The permissible offset of all synchronous belt drives is: no more than 6.4mm or 1.6mm per 304.8mm center distance. Checking the offset should use a high quality right angle device from one transmission to the other and vice versa. Both parallel and angular misalignment effects are taken into account.
The equipment is new complete equipment used in gold trade to recover gold from the gold-carrying carbon. It is suitable for desorption and electrolysis of gold-carrying carbon with different grades. The desorption is an intermixture of 1~2% sodium cyanide and 1~4% sodium hydroxide. The desorption solution is pumped to the heater by circulating pump and heated to the desired temperature. Then the solution flows downward to the bottom of desorption column, through the gold-carrying carbon in the column and upward to the top of it. During flowing, the solution strip gold from the carbon (at this stage the solution containing gold is called as pregnant solution). The pregnant solution runs out from the top of the column and into the electrolytic cell. In cell, the gold in the solution is electrically deposited in the steel wool of the cathode frame, and the rest (called as lean solution) flows back to desorption solution cell and recycled.
The gold mud containing rich gold and silver is taken out of desorption cell and transported to the separation section.
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