Balance problem The imbalance of the grinding wheel is mainly caused by the inaccurate manufacture and installation of the grinding wheel, which makes the center of gravity of the grinding wheel not coincide with the rotary shaft. The damage caused by imbalance is mainly manifested in two aspects. On the one hand, when the grinding wheel rotates at high speed, it causes vibration, which is easy to cause polygonal vibration marks on the surface of the workpiece. On the other hand, the imbalance accelerates the vibration of the main shaft and the wear of the bearing. This can cause the grinding wheel to rupture and even cause an accident. Therefore, it is required that the sand office building with a straightness greater than or equal to 200mm should be statically balanced after loading the chuck. The grinding wheel should be statically balanced after being shaped and trimmed or found to be unbalanced during work.

Matching problems Matching problems mainly refer to the installation and matching of the chuck and the grinding wheel. According to the standard requirements, the diameter of the grinding wheel chuck should not be less than 1/3 of the diameter of the installed sanding disc, and the new grinding wheel should be replaced when the corresponding grinding wheel is worn to a diameter 10 mm larger than the diameter of the chuck. In this way, there is a problem of matching the chuck and the grinding wheel. Otherwise, there will be such a situation that the “large horse-drawn carriage” causes waste of equipment and materials; the “small horse-drawn carriage” does not meet the safety requirements and is liable to cause personal accidents. Therefore, the reasonable matching of the chuck and the grinding wheel can save equipment and cut the material on the one hand, and meet the requirements of safe operation on the other hand. In addition, a cushion with a diameter larger than 2 mm of the chuck and a thickness of 1 mm to 2 mm should be installed between the grinding wheel and the chuck.

The protective cover is the most important protective device of the grinder. Its function is: when the grinding wheel is damaged due to work, it can effectively cover the grinding wheel fragments and ensure the safety of personnel. The shape of the wheel guard is round and square, and the maximum opening angle is not allowed to exceed 90°; the material of the shield is steel with a tensile strength of not less than 415 N/mm2. When replacing a new grinding wheel, the protective cover should be installed firmly and reliably, and the protective cover should not be dismantled or discarded.

Blocking the screen is one of the main protective attachments of the grinder. The opening of the guard above the horizontal plane of the main shaft is greater than or equal to 30 (this device must be provided. Its main function is to block the flying during the grinding process, so as not to hurt The operator is installed at the positive end of the protective cover opening, the width should be larger than the width of the wheel guard, and should be firmly fixed to the protective cover. In addition, the clearance between the circumferential surface of the grinding wheel and the baffle should be less than 6mm.

Bracket problems Brackets are one of the commonly used attachments for grinders. Adjustable brackets must be provided for grinders with a specified grinding wheel diameter of 150 mm or more. The distance between the grinding wheel and the bracket should be less than 1/2 of the minimum shape of the workpiece to be ground, but the maximum should not exceed 3 mm.

Grounding problems Grinding machines use power lines, so the housing of the equipment must have good grounding protection. This is also one of the important factors that cause accidents.

Precautions for use

Side grinding problem:

In the daily use of the grinder, we often find that some operators do not divide the type of grinder, regardless of the type of grinding wheel, and use the side of the grinding wheel to grind it arbitrarily. This is a serious violation of the safety operation rules. behavior. According to the regulations, the grinding wheel with the circumferential surface as the working surface should not be grounded. The radial strength of the grinding wheel is large and the axial strength is very small. When the operator is too strong, the grinding wheel will be broken and even hurt. In practice This behavior should be prohibited during use.

Positive operation problems:

In daily use, many operators are always accustomed to working on the grinding wheel because the direction can be used. In fact, this behavior is a special prohibition in the operation of the grinder. According to the operating procedure, when grinding the workpiece with a grinder, the operator should stand on the side of the grinding wheel and must not operate on the front side of the grinding wheel to avoid the grinding wheel flying out or the grinding wheel breaking out and injuring people when the grinding wheel fails.

Hard to operate the problem:

In the use of grinders, some operators, especially younger operators, are trying to grind quickly and use too much force, which is a very unsafe operation. The flatness of any grinding wheel has a certain strength, which is likely to cause the grinding wheel to break, or even fly out and hurt people, it is also a behavior that should be prohibited.

Common operational issues:

In the actual daily operation, there are also such situations. Some people share a grinder and operate at the same time in order to catch up with the production task and grab the working time. This is a serious illegal operation and should be strictly prohibited. When a grinder is not enough, it can be solved by adding a grinder. It is absolutely not allowed to share a grinder at the same time.

Replacement precautions

Wear problem:

Any grinding wheel has its own wear requirements. If the wear is reached to a certain extent, it must be replaced with a new one. It is not necessary to use excessive wear in order to save materials. This is a very unsafe violation. It is generally stipulated that the new grinding wheel should be replaced when the grinding wheel is worn to a diameter 10 mm larger than the diameter of the chuck.

Validity issue:

The new grinding wheel that is taken out of the warehouse is not necessarily a qualified grinding wheel. Even the new grinding wheel purchased from the manufacturer is not necessarily a qualified grinding wheel. Any grinding wheel has a certain expiration date and is used within the effective period. It is a qualified grinding wheel; if it is used beyond the expiration date, it is not necessarily a qualified grinding wheel. The regulations stipulate that “the grinding wheel should be used within the validity period. The resin and rubber bond grinding wheel must be subjected to the rotation test after one year of storage. Only qualified persons can use it”.

Texture problem

During the use, if any cracks are found in the grinding wheel, stop using it immediately and replace the new grinding wheel to avoid causing the grinding wheel to break and cause injury.

Other precautions  Environmental issues:

Grinders should generally be equipped with special grinder rooms, and it is strictly forbidden to stack inflammable and explosive materials near the grinder room or grinder to avoid fire or explosion accidents, and other parts or articles should not be placed near the grinder.

Management issues: