Maintenance methods for pump bearings and precautions when disassembling: 1. The pump that is newly put into use must be replaced with grease (oil) after 100 hours of operation, and then replaced once every 500 hours. What should I pay attention to when disassembling the bearing in the gear pump class? The following are the issues to be aware of when disassembling the bearing: (1) The drag force should be continued to the extent that the screw pump should stop applying force when the bearing is just installed in the correct position, for example, when the bearing is installed, and the end face of the ferrule (washer) is abutted against the seat hole or the shoulder of the shaft. The end face can neither be squeezed too tightly nor can it be placed in place. Concerned about surprises Label: maintenance methods for water pump bearings and attention problems during disassembly and assembly Previous: Installation and maintenance of steam sandwich pan Next: Daily maintenance and regular maintenance of roller crusher Performance Chloride salts, chlorine-free salts Jinan Huijinchuan Chemical Industry Co., Ltd. , https://www.hjcchemical.com
2, the use of grease-lubricated flow bearings, after 1500 hours of operation, should be replaced with grease, the amount of oil can not be too much or too little, because too much or too little grease will cause bearing heat, the amount of fuel is generally in the The volume of the bearing chamber is preferably 1/2 to 2/3.
3. For bearings lubricated with lubricating oil, the amount of oil should be added to the specified position.
4, the container of lubricating oil or grease should be clean, should be sealed properly, there should be no dust, iron filings and other debris, so as not to damage the bearing 5, the motor bearing generally uses sodium-based grease, the characteristic of this grease is It can withstand high temperatures (125 ° C), but it is easy to dissolve in water, so it can not be used for lubrication of water pump bearings.
(2) The force of the force applied is as far as possible through the axis of the oil-free bearing. The plastic pump requires that the point of application is uniformly symmetrical and stable, and the force is applied through the spherical surface or parallel to the axis.
(3) Avoid the force applied by the rolling element. The diaphragm pump requires the force applied through the inner ring when the inner ring (shaft ring) is attached or detached, and the force is applied through the outer ring when the outer ring is assembled or removed.
(4) The size of the force should be smooth and uniform, and it is not suitable for impact. The self-priming pump requires oil pressure or a tool that can apply smooth tension or pressure. When it is necessary to use hammering, it must also pass through a copper sleeve. It is softer and not chipped with metal, and the tapping force is as gentle as possible. It is best to use a copper rod or a copper hammer for hammering. 
Antifreeze concrete hardens at negative temperatures and achieves the desired properties under specified curing conditions and prevents freezing of moisture in the material at low temperatures. Ensure the normal construction of concrete under negative temperature and reduce the freezing point in concrete mix. It can be combined with water reducing agent and air entraining agent to prevent freezing, and the effect is better. It is used in various concrete projects and is used during construction in the cold season.
The concrete is normally hydrated in a negative temperature environment of 0 ° C to -15 ° C; the freezing point is lowered and the early strength of the concrete is increased.
2. Antifreeze classification
Antifreeze can be divided into strong electrolyte Inorganic Salts (chlorine salts, chlorine salts, rust-proof, chlorine-free salts), water-soluble organic compounds, organic compounds and inorganic salts, and composite antifreeze.
There are two types of freezing point reduction type and Surfactant type. Low-carbon alcohols, glycols, and amides are used to lower the freezing point. The surfactant type enables the material to form a hydrophobic absorption film on the surface, such as an acid phosphate amine salt, an alkylamine, a fatty acid amide, an organic acid ester, an alkyl succinimide, and the like. For example, in concrete for concrete in winter construction, the concrete can be hardened at a negative temperature and achieve sufficient antifreeze strength within a specified time.
Can be made into powder or liquid. It is used to prevent the freezing damage caused by the construction of concrete under negative temperature in winter. Ensure the normal construction of concrete under negative temperature. Its main components are sodium nitrite, carbonate, calcium chloride, calcium nitrite, urea, ethylene glycol and the like. They can reduce the freezing point in concrete mixes. It can also be combined with water reducing agent and air entraining agent to prevent freezing, and the effect is better.
3. Mechanism of action
The antifreeze component can change the liquid phase concentration of the concrete, lower the freezing point, and ensure that the concrete has a liquid phase at the negative temperature, so that the cement can continue to hydrate.
The water-reducing component can reduce the water consumption of the concrete mixing, thereby reducing the amount of ice formation in the concrete, and making the ice crystal grain fine and evenly dispersed, and reducing the damage stress on the concrete.
The bleed air component introduces a certain amount of tiny closed bubbles to slow down the frost heave stress.
The early strength component can improve the early strength of concrete and enhance the resistance of concrete to freezing.
The rust inhibitor such as nitrite can prevent the corrosion of the steel salt to the steel bar to a certain extent, and at the same time, it has the functions of antifreeze and early strength.
4. Product Features
1. This product is made up of components such as antifreeze, early strength, bleed air and water reduction.
2. This product does not contain chlorine salt and has no rust effect on steel bars. It can be widely used in winter construction of industrial and civil buildings, roads, bridges and water buildings.
3. This product is gray powder, easy to dissolve, non-toxic, easy to use.
5 . Instructions
1. Concrete raw materials should meet the requirements of the "Construction and Acceptance Specifications for Reinforced Concrete Projects". Cement: It is advisable to use ordinary Portland cement or slag Portland cement. The cement shall not be shipped for more than two months. Aggregate: The quality of sand and stone used should meet the requirements of winter construction in the national standard. The aggregates must not contain frozen materials such as ice and snow. The frozen sand blocks must be broken and used after screening.
2. When mixing, pay attention to reduce the mixing water properly. The water reduction rate can be controlled at about 10%, and the slump should be controlled within 30mm. When using, it must assist certain insulation measures, and the temperature of the concrete out of the tank should not be lower than 7 °C.
3. The temperature of the newly poured concrete is not lower than 5 °C. Immediately after molding, it is covered with plastic cloth and 1~2 layers of straw bags to strengthen the heat preservation and moisturization of the newly poured concrete. The curing time is not less than 7 days.
4. The dosage is 5% by weight of the cement.
6. Storage and packaging
1. This product is easily soluble in water, so pay attention to moisture and water during transportation and storage.
2. This product is packed in moisture-proof woven bag, the net weight of each bag is 50kg±0.5kg.
7. Common types
antifreeze agents include alcohols, alcohol ethers, chlorinated hydrocarbons, and inorganic salts. Commonly used antifreeze agents are methanol, ethanol, isopropanol, ethylene glycol, Propylene Glycol, diethylene glycol, ethylene glycol butyl ether, propylene glycol butyl ether, ethylene glycol butyl ether acetate, dichloromethane, 1, 1-two Ethyl chloride, 1,2-dichloroethane, dimethyl sulfoxide, formamide, calcium chloride, sodium acetate, magnesium chloride, and the like. Dimethyl sulfoxide can be used as an antifreeze for latex, and urea and thiourea also have an antifreeze effect on the emulsion.