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15

2023

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08

Common Knowledge on the Selection and Use of Hydraulic Crushing Hammers

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Hydraulic crushing hammer is a crushing machine that converts hydraulic energy into mechanical impact energy. It mainly uses hydraulic machinery such as excavators and loaders as load-bearing equipment, and has the advantages of high efficiency, low cost, high reliability, and high safety. It is widely used in urban construction, mining, smelting, transportation, hydropower and other engineering construction.
The selection of hydraulic crushing hammers Currently, hydraulic crushing hammers in the market have similar appearances, various brands, and varying prices, which poses significant challenges for users in selecting suitable hydraulic crushing hammers.
For users or investors of hydraulic fracturing hammers, it is necessary to spend some time before purchasing to understand the basic knowledge of the performance, structure, quality, efficiency, and how to match with excavators. Especially for those who own mid to high end excavators, it is necessary to carefully consult and develop a crushing hammer selection strategy and standard that is beneficial to excavators, in order to avoid the occurrence of large horses pulling small cars The phenomenon of a small horse pulling a cart or a good horse pulling a broken cart. It can be said that the selection of hydraulic crushing hammers is not only related to the efficiency and duration of future crushing projects, but also to the return on investment of investors.
When choosing a crushing hammer, the following aspects should be considered:
1. Fully considering the weight and bucket capacity of the excavator can prevent the excavator from tipping over due to the excessive weight of the crushing hammer when the boom is fully extended. If the selected crushing hammer is too large, it may cause the excavator to tip over, while if it is too small, it may not fully utilize the excavator's effectiveness, and it can also accelerate the damage of the crushing hammer. Only when the weight of the excavator and crusher is matched can the excavator and crusher be fully utilized. In general, the standard bucket capacity of an excavator reflects the weight of the machine. At present, a better method is to calculate the range of optional crushing 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+ ρ V)
In the formula: Wh=Wl+W2+W3W1- weight of the hydraulic hammer body (bare hammer) W2- weight of the drill rod W3- weight of the hydraulic hammer frame W4- weight of the excavator bucket itself ρ—— Sand density, general ρ= L600N/m3V - excavator bucket capacity
2. The working flow rate and pressure of hydraulic crushing hammers vary with different sizes of hydraulic crushing hammers. A small hydraulic crushing hammer can have a flow rate of only 23L per minute, while a large hydraulic crushing hammer can reach a flow rate of over 400L per minute. When selecting a hydraulic crushing hammer, it is important to ensure that the flow requirement of the hydraulic crushing hammer matches the output flow of the excavator backup valve. Generally speaking, the flow rate determines the working frequency of the hydraulic crushing hammer, which is the number of impacts per minute. The flow rate is directly proportional to the number of impacts. However, when the output flow of the backup valve of the excavator is greater than the required flow of the hydraulic crusher, it will generate too much 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 hammer 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 hydraulic crushing hammers is vehicle mounted, and there are currently three most common exterior designs for hydraulic crushing hammers, namely triangular type, plywood type, and box type (also known as silent type).
Triangle type and sandwich type usually use two thick steel splints to protect both sides of the hammer core. This structural design does not protect the front and rear of the hydraulic crushing hammer. Their disadvantage is that they have higher noise than box type hydraulic crushing hammers of the same tonnage, and the steel plates on both sides are prone to loosening or cracking, which also provides poor protection for the hammer body. This type of structure is already rare in the European and American markets.
The structure of a box type hydraulic crushing hammer is that the outer shell completely encloses the hammer body, and the outer shell is equipped with vibration reducing materials, which not only creates buffering between the crushing hammer body and the outer shell, but also reduces the vibration of the carrier. The advantages of box type hydraulic crushing hammers are that they can provide better protection for the hammer body during operation, have low noise, reduce vibration on the carrier, and also solve the problem of loose shells. This is also the mainstream and development trend in the global market.
As a general user, the most suitable hydraulic crushing hammer should be selected based on a comprehensive consideration of multiple aspects. Therefore, before selecting the excavator, one should carefully read the operating manual of the excavator, or consult with the excavator manufacturer, crushing hammer manufacturer, and dealer for relevant technical consultation.

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