Physical balance: The left, middle and right of the balance beam are each set with a knife mouth. The middle knife mouth down on the onyx knife bearing, the left and right knife mouth up, through the lugs of the onyx knife bearing down hanging rings and lifting plate.
The hand wheel controls the lifting and lowering of the beam through the lifting rod. In the back of the column is equipped with a level bubble. Balance with a box of weights to weigh 1000g, for example, the weights have 200g, 100g, 20g, 2g of each two, 500g, 50g, 5g, 1g of each.
How to use the balance.
1 installation and adjustment; ① the parts need to be cleaned and installed. The back of the plate is marked with "1", "2" mark, should be installed in accordance with the "left 1 right 2". After installation, you should turn the handwheel to make the beam rise and fall several times, adjust the supporting screws when the beam falls, so that the beam does not twist when it rises and falls, and when it falls, the middle knife mouth leaves the middle knife bearing, and the lifting plate just falls on the base. ② adjust the level of the balance base: adjust the leveling screws, so that the base bubble in the middle of the circle engraved position, that the balance has been adjusted to the horizontal position. ③ adjust the beam balance: use the tweezers to dial the swim code to the left zero scale, turn the handwheel slowly raise the beam to the center of the dial engraved line shall prevail, so that the pointer swing equal amplitude on both sides, such as not equal amplitude, then the beam should be lowered to adjust the balance screws at both ends of the beam, and then raise the beam ...... so repeatedly, until the beam balance. Another point should be clear: for the balance of the entire beam system (including the two lifting plate), the center of gravity is located directly below the knife. The more sensitive the balance and the distance from the center of gravity to the knife mouth, adjust the position of the sense weight can change the position of the center of gravity of the entire beam system, the higher the position of the center of gravity, the closer the distance from the knife mouth the higher the sensitivity of the balance, the smaller the sense. For a balance, when it is shipped from the factory, the position of its sense weight is adjusted, and the sensitivity of the balance is determined, generally do not move its sense weight when using the balance.
2 Use: ① When weighing an object, place the object to be weighed on the left plate, put the weight in the right plate with tweezers, then turn the handwheel, raise the beam and see how the pointer deflects, then lower the beam to add or remove the weight, then raise the beam again to see how the pointer deflects ...... until the balance is balanced, at which point the total mass shown by the weight and the travel code is the mass of the object to be weighed. The total mass of the weight and the cursor is the mass of the object. ②Carrying table usage: Some experiments to determine the physical quantity is not easy to put the object directly into the lifting plate weighing, can be used with the help of the carrying table. For example: to measure the buoyancy of the object immersed in liquid, you can first put the object into the suspended tray to weigh the mass of , and then adjust the position of the carrier table, the object with a thin wire bolted, immersed in a beaker with liquid (objects do not touch the bottom of the cup), the beaker on the carrier table, the object on the thin wire hanging on the hook, then weigh the quality of the object's true mass and the difference between buoyancy.
Physics Balance A balance is an instrument for weighing the mass of an object. Commonly used are analytical balance, physical balance, student balance (simple physical balance), tray balance and so on. The physical balance, student balance and tray balance are commonly used in secondary school physics labs. All of the above balances are made using the principle of "equal forces acting on equal arms when the lever is in balance". Mainly composed of a travel code, scale, balance nut, base plate, indexing plate, crossbar pointer, heavy vertical line, etc.
The main technical parameters of the balance are weighing, sensitivity, etc.. Weighing capacity refers to the balance can weigh the maximum mass value (full value), often expressed in grams (g) as the unit. Sensitivity is to make the balance pointer from the balance position deflection to the dial a degree of the maximum mass required, so the sensitivity is also called "index value", often in "milligrams" (mg) as the unit, the sensitivity reflects the sensitivity of the balance. Technical parameters of the balance and variability, level, vernier scale error, weight accuracy, etc.
Sichuan Jinrun Instrument&Equipment Co., Ltd is a high-tech enterprise for education information construction, a member of China Education Equipment Industry Association and Sichuan Education Equipment Industry Association. The company has a research and development training center of more than 2000 square meters in Chengdu, with 8 types of independent intellectual property rights products, with professional technical team combined with the development trend of modern education equipment, to provide intelligent education software and hardware support products for the basic education industry.
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