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A daily inspection of the breaker and its associated components is essential. “Inspect the bit, bushings and retainer pin for excessive wear,” says Robert Reister, product specialist, attachments, Bobcat. “Also inspect the bit and bushings for cracking or galling. Check the connection plate for any cracks or damage. Make sure there are no leaks in the hydraulic couplers and check for wear in any areas of hoses that may rub or cause friction.” Reister recommends checking the attachment connection and hose coupling systems every 8 to 10 hours.
Bushings should be inspected every 100 hours. Munch says that typical bushing service life is 200 to 500 hours for the lowers and 500 hours for the uppers. Wear is typically on the front and rear faces of the bushings. Cat lower bushings can be rotated 90 degrees to provide new wear faces and thereby extend service life. Some manufacturers provide a bushing wear inspection tool to make this process easier and more accurate.
Henry says it can take a year or more for problems to show up but once they do the breaker will likely need rebuilding or replacement. He cites pitting of the case-hardened surface of the piston is an example of such wear.
Some service can be done in the field. Lower bushings can often be replaced on site. But most service must be done in the shop. Munch suggests an annual internal reseal be done at the dealer.
Dan Vale from the service department at NPK says inspection of fasteners is essential and that all fasteners should be torqued to the specs provided by the manufacturer. He also emphasizes the need to clean and cap hoses when dismounting or storing the breaker in order to maintain a clean hydraulic system.
Reister says replacing damaged or missing signs and decals is an important maintenance step, especially for rental products.
As the first-line crushing equipment in the industrial field, crusher is very important to the whole production line. Its demand is increasing, and there are more and more crusher manufacturers. How should we choose?
Factors to be considered when selecting crusher
In the selection of crusher, the type, hardness, particle size of incoming and outgoing materials, output and construction site shall be fully considered.
1. hardness of materials
Different kinds of materials have different hardness. Generally, the greater the hardness, the higher the crushing difficulty coefficient. For crushing hard or medium hard stones, jaw crusher should be selected as the primary crushing equipment. When crushing medium hard or soft stones, cone crusher, impact crusher or hammer crusher can be directly selected.
2. material specification
If the material size is large, the jaw crusher can be selected as the primary crusher; When the size of the stone is small and it needs to be composed of certain graded stone, the combined crushing and screening equipment shall be selected, such as the combined crushing equipment composed of jaw crusher, cone or impact crusher and hammer crusher.
3. humidity of materials
The moisture content of the material will also affect the selection of the crusher. When the moisture content is too large, the fine-grained material will agglomerate or stick to the coarse-grained material due to the increase of humidity, thus increasing the viscosity of the material, reducing the ore discharge speed and reducing the productivity. When it is serious, it will even cause the blockage of the ore discharge outlet and affect the normal production.
4. developed degree of ore cleavage
The developed degree of ore cleavage directly affects the productivity of the crusher. As the ore is easy to break along the cleavage surface during crushing, the productivity of the crusher for crushing the ore with developed cleavage is much higher than that of the ore with dense crushing structure.
5. particle size of incoming and outgoing materials
The size of incoming and outgoing materials is used to judge the model and crushing level of the required crushing equipment.
If the content of coarse particles (larger than the size of ore discharge port) in the crushed materials is high or the ratio of very large ore feeding to the width of ore feeding port is large, the crushing ratio (the ratio of the particle size of the materials before crushing to the particle size of the materials after crushing) that the crusher needs to achieve is large, so the productivity is reduced.
If the content of crushed material fines (close to or less than the size of ore discharge port) is large, or the ratio of very large ore feeding to the width of ore feeding port is small, the crushing ratio to be achieved is small, so its productivity is correspondingly improved.
If the feed particle size is large and the discharge particle size is small, secondary crushing or multi-stage crushing is often required. If the particle size of the broken material is small, multi-stage crushing is generally not required.
6. output requirements
The output requirement is an important indicator to determine the crushing equipment. The higher the output requirement, the larger the required crushing equipment specification, and the corresponding input and output will increase.
7. construction site
The specific situation of the construction site is a more direct factor affecting the selection of crusher equipment, such as the size of the construction site, the specific location of the crushing equipment, etc.
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Associate member Area of expertise Affiliation; Emile Chimusa : Medical population genomics, Genetics Epidemiology, Computational risk predication, medical OMICS machine learning
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