Schools are one of the longest places for children to stay, and there are also many safety hazards. Therefore, the first thing to do in safety education is to let the child know where the danger is. The higher the child's awareness of the danger, the safer it will be. During physical education Physical education is an important course for exercising and enhancing physical fitness. It is also one of the children's favorite courses. Because the training content is diverse, the safety considerations are also changed due to the content of the training and the instruments used. It’s complicated. Do some warm-up exercises before class to prevent joints, muscles and ligaments from straining or spraining during exercise; Wear sportswear and sneakers for physical education classes, don't wear plastic shoes or shoes, check if the laces are tight before class; Do not put hard, sharp and sharp objects such as keys and knives in the tops of your shirts and trousers; Do not wear brooches, earrings, hairpins, and various metal or glass decorations; Students with myopia should try not to wear glasses for physical education. If you must wear glasses, be careful when doing the exercises; you must remove the glasses when doing the exercise on the mat; When learning new actions, listen carefully to the teacher to explain the essentials of the action, so as not to be injured due to irregular movements; After the strenuous exercise, you should do the corresponding relaxation activities, so as to avoid the muscles being in a state of tension and discomfort; Be careful and use the various instruments on the stadium and do not use damaged equipment; Don't arbitrarily perform difficult moves to avoid danger; Students with illness or physical discomfort should not engage in vigorous physical activity. Female students in the physiological period should avoid large or shocking running and jumping activities, and should not carry out strength training to increase abdominal pressure; In the event of a sudden illness or accident, report it to the teacher immediately. On the experimental class Experiment class, hands-on class, but your hands can not be smashed, otherwise it will create a lot of trouble. To follow the teacher's arrangements, do the experiment in strict accordance with the procedures; Don't mess with the items placed in the lab, let alone bring them out of the lab; Do not touch and open various reagents at will, do not mix and splash at will, and don't use your tongue to try to prevent poisoning; When using an alcohol lamp for chemical experiments, be sure to use a lamp cover to extinguish the fire and prohibit the butt ignition; When doing biological experiments, such as making specimens and dissecting animals, be careful not to cut or stab your fingers with sharp tools such as knives and scissors; Glass slices, specimens, etc. in the experiment should be placed with tweezers; After completing the experiment, you should turn off the power supply, water source, and air source, properly dispose of the remaining experimental items, clean up flammable paper dust and other debris, eliminate various hidden dangers, and wash your hands. ▼▽▼ If chemical reagents accidentally enter the eye, rinse immediately with water; If the chemical spills on the skin, first wipe it with a towel and rinse with water. If it is a highly corrosive solvent, the teacher should be informed of the emergency treatment.
(1) Diamond pen dressing grinding wheel: According to the size of diamond particles and their distribution in the pen, diamond pens can be divided into several types, such as chain and powder. The alloy with strong bonding force is used as the bonding agent, so the diamond grinding wheel particles are not easy to fall off during use, so there is no need to repair the grinding process.
(2) Grinding wheel dressing by rolling method: Diamond grinding wheel dressing by rolling method. Grinding wheel drives the rolling wheel at the speed of 1~2m/s by reducing the speed
Made of, carbide or abrasive) rotary. The pressure of rolling wheel applied to grinding wheel is about 3~5MPa, grinding the surface of diamond grinding wheel
Make the abrasive particles fall off. The grinding wheel dressing by rolling method has better cutting performance and lower cost, but the surface roughness of the grinding part is rougher and rolling
Damage, short life, easy loss of precision. Therefore, this dressing method is mainly used for forming grinding with small batch size and low precision.
Green silicon carbide or ceramic white corundum is used for dressing. Dressing ring is the first choice for dressing diamond grinding wheel or CBN grinding wheel. It is sharp in dressing, not easy to remove sand and has high dressing efficiency. Wheel Dresser,Dressing Tools,Dressing Roller,Grinding Wheel Dresser Henan Jinlun Superhard Material Co., Ltd , https://www.jinlunsuperhard.com