The selection of a crushing hammer for the Carter 336 excavator generally needs to consider the following aspects:
1. The weight and bucket capacity of the CAT 336 excavator are fully considered to prevent the excavator from tipping over due to the excessive weight of the crushing hammer when the boom is fully extended. Choosing a hammer that is too large may cause the excavator to tip over, while a hammer that is too small may not fully utilize the excavator's capabilities and accelerate damage to the hammer. Only when the weight of the excavator and the breaking hammer matches can they fully utilize their effectiveness. In general, the standard bucket capacity of an excavator reflects the weight of the machine. The current good method is to calculate the range of optional breaking hammers based on the bucket capacity of the excavator.
The relationship between bucket capacity and hydraulic hammer weight is as follows: Wh=(0.6~0.8)(W4+ρV)
In the formula: Wh=Wl+W2+W3W1- weight of hydraulic hammer body (bare hammer) W2- weight of drill rod W3- weight of hydraulic hammer frame W4- weight of excavator bucket itself ρ – sand density, generally ρ=l600N/m3V – bucket capacity of excavator bucket
2. The working flow rate and pressure of the hydraulic breaker of Carter 336 excavator are different. The flow rate of a small hydraulic breaker can be as low as only 23L per minute, while a large hydraulic breaker can reach over 400L per minute. When selecting a hydraulic breaker, it is important to ensure that the flow rate of the hydraulic breaker matches the output flow rate of the excavator's backup valve. Generally speaking, the flow rate determines the working frequency of the hydraulic breaker, that is, the number of impacts per minute, and the flow rate is directly proportional to the number of impacts. However, when the output flow rate of the excavator's backup valve is greater than the required flow rate of the hydraulic breaker, it will generate excessive heat in the hydraulic system, causing the system temperature to be too high and reducing the service life of the components. When selecting a hydraulic hammer, it is also necessary to ensure that the working pressure of the hydraulic breaker matches the limited pressure of the backup valve. If it does not match, an overflow valve should be added to the pipeline system and adjusted according to the rated pressure of the hydraulic hammer.
3. The structure of the hydraulic breaker for the Carter 336 excavator is vehicle mounted. There are currently three most common exterior designs for hydraulic breakers, namely triangular, clamp plate, and box type (also known as silent type).
Triangular and clamp type structures usually use two thick steel clamps to protect the two sides of the hammer core. This structural design does not provide protection for the front and back of the hydraulic breaker. Their disadvantage is that they produce louder noise than box type hydraulic breakers of the same tonnage, and the steel plates on both sides are prone to loosening or breaking, which also provides poor protection for the hammer body. Such structures are rare in the European and American markets.
The structure of the box type hydraulic breaking hammer is that the shell completely wraps around the hammer body, and the shell is equipped with vibration reducing materials, which can produce buffering between the breaking hammer body and the shell while also reducing the vibration of the carrier. The advantages of the box type hydraulic breaker are that it can provide better protection for the hammer body during operation, low noise, reduce vibration of the carrier, and also solve the problem of loose shell. This is also the mainstream and development trend of the global market.
