50results about How to "Meet lubrication" patented technology

The invention relates to a rolling oil composition used for a twelve-high reversing cluster mill; the rolling oil composition belongs to the field of metallurgical steel rolling oil products, and comprises the components according to weight percent as follows: 60-70 percent of compound neopentyl polyol ester, 14-28 percent of mineral oil, 1-5 percent of phosphorus-containing extreme-pressure and anti-wear agent, 1-5 percent of sulfur-containing extreme-pressure and anti-wear agent, 2-12 percent of compound emulsifier, 1-3 percent of anti-rust agent, 1-3 percent of antioxidant and 0.01-0.5 percent of defoamer; the rolling oil composition takes the compound neopentyl polyol ester synthetic ester with excellent lubricating performance as the lubricating basic component; an oiliness agent main body with high lubricating performance and high extreme-pressure and anti-wear performance is composed by adding the scientific components of the phosphorus-containing and the sulfur-containing extreme-pressure and anti-wear agents; and the anti-rust performance and the emulsion stability are ensured by adopting the mineral oil, the anti-rust oil, the emulsifier and the antioxidant with the appropriate proportion for coordination, thereby creatively solving the contradiction between the lubricating performance and the detergence, ensuring the requirements on the lubricating performance of the quality when rolling steel plates with thin specifications, protecting the lubricating requirements of back-up bearings and ensuring the volatility and the annealing detergence under the cleaning-free condition.

The invention provides a gear lubricant composite for manual transmissions of the light cars, comprising (A) at least one type of refining mineral oil with high viscosity index, or polyolefin synthesis oil, or ester lubricants, or a free composite of the above components, (B) at least one type of viscosity index improver, (C) at least one type of pour point depressant, (D) at least one type of extreme pressure additive with sulfurs, (E) at least one type of anti-wear additive with phosphorus, (F) at least one type of wear, oxygen, and corrosion-preventing multifunctional additive with phosphorus, (G) at least one type of anti-rusting additive, and (H) at least one type of friction modifier. The lubricant composite has excellent performance of high and low temperature, which can meet the requirements of gear oil with a viscosity grade of 75W / 90. Moreover, passing the full-size gear bench tests as CRCL-42, L-37, L-33, L-60, and L-60-1 as well as cycle bench tests for the manual transmissions of the light cars, the gear lubricant composite can meet lubrication requirements of the manual transmissions of the light top-grade cars.

The present invention provides a special gear lubricating oil composition for a high speed train. The special gear lubricating oil composition comprises: (A) at least a high viscosity index hydrorefining III mineral oil, or polyolefin synthesis oil, or ester synthesis oil, or an any combination selected from the above components; (B) at least a viscosity index improver; (C) at least a pour point depressant; (D) at least a vehicle gear oil composite additive; (E) at least a phosphorus-containing anti-wear additive; (F) at least a metal deactivation additive; (G) at least an ash-free dispersion additive; and (H) at least an energy-saving friction-reduction agent. The lubricating oil composition has characteristics of excellent high speed anti-scratching performance, excellent high temperature detergency and excellent energy-saving friction-reduction performance, wherein the high speed anti-scratching performance of the lubricating oil composition can be increased by 33% and transmission efficiency can be increased by 15% compared with the commercially available API GL-5 vehicle gear oil.

The invention provides environmentally-friendly energy-saving-type heavy loading screw compressor oil. The environmentally-friendly energy-saving-type heavy loading screw compressor oil comprises 90-95% of composite base oil and 10%-5% of other additives in percentage by weight. Poly Alpha-Olefins (PAO) and dioctyl sebacate are compounded to serve as the base oil of the environmentally-friendly energy-saving-type heavy loading screw compressor oil. The environmentally-friendly energy-saving-type heavy loading screw compressor oil provided by the invention has the advantages of good operating characteristics, long service life and good biodegradability and also has effects of improving the efficiency of a screw compressor, reducing the abrasion and corrosion of a screw, effectively prolong the service life and the oil draining period of the screw compressor and meeting the requirements under special service conditions. The environmentally-friendly energy-saving-type heavy loading screw compressor oil provided by the invention is not only suitable for the requirements of various middle-heavy loading screw compressors under service conditions, and but also can meet the lubrication, cooling and sealing requirements of the middle-heavy loading sliding vane compressors.

The invention provides an ashless antiwear oil film bearing lubricant composition, which comprises: (A) at least a highly refined mineral oil with high viscosity index; (B) at least an emulsifier; (C) at least an anti-foaming agent; (D) at least an ashless phosphorus-containing antiwear additive; (E) at least an anti-oxidant; and (F) at least a metal passivator. The above lubricant component has excellent demulsibility, filterability, anti-foaming property, air release property, abrasion resistance and oxidation resistance, passes through FAG FE-8 bearing wear experiments, SKFEMCOR bearing corrosion experiments and FLENDER anti-foaming experiments, and is suitable for lubricating various bearings and industrial gears, especially lubricating highspeed wire rod oil film bearings.

The invention provides an energy-efficient vehicle gear lubricating oil composition, which contains (A) at least a highly refined mineral oil with high viscosity index, or polyolefin cogasin, or ester cogasin, or random combination of the above components; (B) at least a viscosity-index improver; (C) at least a pour-point depressant; (D) at least a sulfur-containing extreme pressure additive; (E) at least a phosphorus-containing antiwear additive; (F) at least a metal deactivation additive; (G) at least an antirust additive; and (H) at least an energy-saving friction-reducing agent. The above lubricating oil composition has excellent energy-saving antifriction performance. Through the test evaluation of FZG gear drive efficiency, the lubricating oil composition provided by the invention can be used to raise transmission efficiency by 5-15% in comparison with commercial vehicle gear oil.

The invention discloses preparation of high-speed bearing grease, and the grease is particularly applied for lubricating high-speed bearings in the industries of electronics, machine tool manufacturing, textile chemical fiber and the like. The grease consists of base oil and thickening agent, the penetration of the prepared grease is between 200 and 340 at the temperature of 25 DEG C, and the similar viscosity is smaller than 1400 at the temperature of minus 50 DEG C. The grease can meet the lubrication of the bearing the speed factor (DN value) of which is more than 2 million, can lubricate completely in a cold environment, and produces very small noise.

The invention discloses a bearing-lubricating device of a turbojet engine. The turbojet engine is provided with an oil inlet, and a lubricating oil tube is arranged from the oil inlet to the interior of the turbojet engine; a bushing is arranged in the turbojet engine, a spindle is arranged in the bushing, the front end of the spindle is provided with a front bearing pedestal and a front bearing, the rear end of the spindle is provided with a rear bearing pedestal and a rear bearing, the bushing is provided with a rear-bearing oil inlet close to the position of the rear bearing pedestal, and a front-bearing oil inlet is arranged at a position in the turbojet engine, which is close to the front bearing pedestal. A dedicated lubricating system or lubricating oil tank does not need to be arranged on the outside of the bearing-lubricating device, the bearings can be lubricated as long as lubricant is added in aviation kerosene according to an appropriate proportion, thereby, the bearing-lubricating device has convenient use and good lubricating effect.

The invention provides a composite fungicide and metal cutting fluid with the same and a preparation method of the composite fungicide. The composite fungicide comprises 1,2-benzisothiazole-3-ketone, epsilon-polylysine and water-soluble organic amino. In the composite fungicide provided by the invention, the three components, namely the 1,2-benzisothiazole-3-ketone, the epsilon-polylysine and the water-soluble organic amino are synergistic, so that the sterilization effect of the composite fungicide is improved; and the metal cutting fluid with the composite fungicide is good in sterilization effect, remarkable in biological stability, high in security and wide in application prospect, meets on-site process requirements such as lubrication, cooling, emulsion stability and corrosion resistance, and meets ideas of green chemicals.

The invention relates to the field of lubricating oil and in particular discloses a composition used for pure electric vehicle transmission oil and a preparation method thereof as well as transmission oil containing the composition and a preparation method thereof. The composition used for the pure electric vehicle transmission oil is prepared from the following components in parts by weight: 5-25 parts of a viscosity index improver, 0.5-1.5 parts of a purification dispersant, 2-8 parts of an antioxidant, 0.05-0.5 part of a corrosion inhibitor, 1.5-5.0 parts of an antiwear agent, 0.5-3.0 parts of a friction modifier, 0.5-1.5 parts of an anti-aging agent, 0.01-0.1 part of an anti-foaming agent and the balance of base oil A, wherein the total parts by weight of the components is 100 parts. The composition used for the pure electric vehicle transmission oil and the transmission oil containing the composition can provide excellent oxidation stability, excellent antifoaming property, excellent antiwear corrosion-resistant property, good material adaptability with a pure electric vehicle transmission and copper protection performance under high voltage and high current conditions.

The invention relates to a safe antibacterial cutting fluid, which is prepared from the following raw materials in parts by weight: 14-27 parts of diethanol amine boric acid polycarboxylic acid composite ester, 16-23 parts of inositol hexaphosphate ester, 30-36 parts of petroleum sodium sulfonate, 3-6.5 parts of ethyl vanillin, 8-16 parts of polyethylene glycol, 1.6-3.3 parts of sodium benzoate, 4.5-8 parts of barium tricarboxylic acid, 3-7 parts of sodium gluconate, and 80 parts of water. The safe antibacterial cutting fluid can meet the functions of lubricating, antirust, cooling and washing, has strong antibacterial ability, does not give out odor in long time and is harmless to human bodies.

The invention discloses a power-closed small angle intersecting shaft gear test bench which comprises an electric motor, an auxiliary gear box, a moving platform, a rotating platform and intermeshingtest gear I and test gear II. Each part of the test bench constitutes a power-closed system to compensate for lost power. The movement of one test gear in directions of two degrees of freedom of X andY is achieved through the moving platform, the angular rotation of the other test gear is achieved through the rotating platform, the parallel shaft installation of a thickened gear and the intersection shaft installation in a certain angle range can be satisfied, and a shaft crossing angle error and a mounting distance error of the thickened gear are simulated. The contact spot, transmission error, transmission efficiency, vibration and the like of the high-speed thickening gear can be tested. At the same time, the test bench also be used for studying the influence of the shaft crossing angle error and the mounting distance error on the meshing performance of the thickened gear.

The invention provides a low-odor automobile switch lubricating grease composition. The low-odor automobile switch lubricating grease composition comprises the following components in parts by weight:62-93 parts of base oil, 5-20 parts of a thickening agent and 2-18 parts of a solid lubricant. The invention also discloses a preparation method of the low-odor automobile switch lubricating grease composition. The low-odor automobile switch lubricating grease composition prepared by adopting fumed silica to thicken poly-alpha olefin base oil and adding the solid lubricant has an extremely low odor grade. Through the test of VS-01.00-L-06005-A1-2018 Test Specification for Odor of Nonmetallic Materials in Vehicles, the odor grade is 1.0-1.5 grade, which is reduced by one grade or more than onegrade compared with the odor of the lubricating grease in the prior art. The automobile switch lubricating grease composition disclosed by the invention also has good colloid stability, wear resistance, friction reduction, shearing resistance and excellent high and low temperature performance, is suitable for lubricating and protecting various switches, and is also suitable for lubricating various parts of an automobile cockpit.

The invention discloses a pulse oil supply type engine air cylinder block oil passage. According to the structure, the tail end of a main oil passage of an engine air cylinder block is divided into a crankshaft bearing oil supply branch passage and a cam shaft oil supply branch passage, and the cam shaft oil supply branch passage is communicated with a cam shaft bearing hole in the engine air cylinder block; the crankshaft bearing oil supply branch passage is communicated with a crankshaft bearing; a lining is inlaid in the cam shaft bearing hole and provided with oil inlet and outlet holes; a groove is formed in the large-head end of a cam shaft, when the cam shaft rotates to one certain position, the cam shaft oil supply branch passage is communicated with a rocker arm oil supply passage, and at the moment the main oil passage can supply oil to the crank shaft bearing, the cam shaft and a rocker arm at the same time. Oil supply time periods are different through the cam shaft large-head end structure, intermittent oil supply is carried out, and therefore reduction of oil pressure is relieved. While high oil pressure is ensured, enough lubrication oil is supplied to other parts. Due to the fact that the rotating speed of the cam shaft is relatively high, oil can be supplied to the rocker arm one time when the cam shaft rotates a circle, and the pressure of the main oil passage can be kept basically stable.

The invention discloses a pulse oil-supply type oil duct of an engine cylinder body. The structure of the pulse oil-supply type oil duct of the engine cylinder body is as follows: a cam shaft bushing is arranged inside a cam shaft bearing hole on the engine cylinder body; a section of an oil tank and an oil outlet are arranged on the cam shaft bushing; and a T-shaped oil hole is processed on the cam shaft. The oil tank and the oil outlet on the cam shaft bushing are respectively communicated with the cam shaft and a rocker arm oil supply channel when the cam shaft rotates to a certain position; a main oil duct can supply oil to a crank bearing, the cam shaft and a rocker arm at the same time. The oil tank on the cam shaft bushing is communicated with an oil supply branch channel of the cam shaft, but the oil outlet on the cam shaft bushing cannot be communicated with the oil supply channel of the rocker arm when the cam shaft rotates to deviate from the position. By ingenious designs of the cam shaft bushing and the cam shaft, the cam shaft can finish twice and two paths of oil supply with different oil supply quantities after rotating a circle. Lubrication of the rocker arm can be achieved, at the same time the pressure of the main oil duct is basically constant, and parts such as a crank, the cam shaft and the like are guaranteed to be fully lubricated.

The invention discloses a valve steel continuous casting crystallizer functional protection material. The material comprises the following raw material components including, by weight, 36.0-42.0% of pre-melt materials, 14.0-17.0% of wollastonite, 9.0-11.0% of fine glass powder, 3.0-5.0% of lithium carbonate, 7.0-9.0% of fluorite, 2.0-4.0% of sodium fluoride, 3.0-5.0% of cryolite, 10.0-12.0% of graphite carbon, 2.0-3.5% of carbon black and 2.0-3.5% of a binder. According to the valve steel continuous casting crystallizer functional protection material, the thermal insulation effect and the melting effect are guaranteed, furthermore, pulling break, slag inclusion and depression of casting blanks are effectively prevented, and the non-cleaning rate of the surfaces of the obtained casting blanks reaches up above 98%.

The invention relates to a novel rolling sliding bearing and friction-lubrication mechanism structure. According to the novel rolling sliding bearing and friction-lubrication mechanism structure, increasing rate of total hydrocarbon value is measured based on changing rate of total hydrocarbon data; the changing rate of total hydrocarbon data comprises total hydrocarbon data range changing rate and total hydrocarbon data depth changing rate; and total hydrocarbon value increasing rate is calculated via comparison of the total hydrocarbon data range changing rate with the total hydrocarbon data depth changing rate. The calculation method of the total hydrocarbon value increasing rate disclosed above is capable of providing oil gas layer evaluation with convenience.

The invention belongs to the technical field of metal cutting tool manufacturing, and relates to a diamond-like in-situ self-reaction graphitized lubricating coating cutter and a preparation method thereof. The base body surface of the cutter is provided with a diamond-like coating thin film, and the outer layer of the diamond-like thin film contains transition metal element components doped withiron, cobalt and the like. The diamond-like thin film of the cutter is prepared by using a reactive magnetron sputtering method, wherein the coating principal process is divided into two steps that adiamond-like inner layer is prepared through non-doping reaction magnetron sputtering, and a diamond-like outer layer is prepared through transition metal element doped reaction magnetron sputtering.The outer layer of the thin film of the diamond-like coating cutter contains a small amount of transition metal element impurities, and under the action of cutting high temperature, the transition metal elements can induce sigma bonds to be switched to pi bonds between carbon atoms in diamond-like coating, so that part of the diamond-like coating of the cutting friction interface is promoted to undergo the in-situ reaction to be converted into graphite, and then the metal cutting process is effectively lubricated.

The invention relates to the technical field of lubrication of vertical pump bearings, in particular to a vertical pump bearing lubrication cooling device. The vertical pump bearing lubrication cooling device comprises a shaft, a bearing frame, an outer sleeve, a bearing gland, an upper bearing, a shaft sleeve, a lower bearing and a spiral sleeve. The spiral sleeve is connected to the shaft. The upper bearing, the shaft sleeve and the lower bearing are connected to the spiral sleeve. The spiral sleeve is provided with an oil rotating section. The oil rotating section is provided with trapezoidal threads I and trapezoidal threads II. An oil collecting groove is formed between the trapezoidal threads I and the trapezoidal threads II. The thread rotating direction of the trapezoidal threads Iis opposite to that of the trapezoidal threads II. An oil outlet pipe connecting pipe is provided with an oil outlet hole. A gland connecting pipe is provided with an oil inlet hole. An oil outlet pipe is connected between the oil outlet hole and the oil inlet hole. The vertical pump bearing lubrication cooling device solves the problem that a bearing on a vertical pump is hard to lubricate, meanwhile, the requirement for bearing lubrication at the low rotating speed can be met, the air cooling and heat dissipation functions are achieved, the temperature of the outer sleeve and the temperature of the bearings are effectively reduced, a good environment is provided for bearing running, and safe running of the vertical pump is guaranteed.

The invention provides a gearbox lubricating pump used for a rail vehicle. The gearbox lubricating pump comprises a suction filter, an oil pump and an oil pump gear, wherein the oil pump comprises an oil pump shell; the suction filter is fixedly connected with the lower end surface of the oil pump shell; the oil pump shell comprises a ball valve chamber, a pump body and a gearbox; the ball valve chamber and the gearbox are separately arranged at the two sides of the pump body and are fixedly connected with the pump body; a gear pair is supported in the pump body through a gear shaft I and a gear shaft II; one end of the gear shaft I penetrates through the gearbox; and the oil pump gear is fixedly arranged on the gear shaft I. Driven by the oil pump gear, the clockwise and counterclockwise rotating of the gear pair can both produce forced lubrication, so that the lubricating pump rotates at different speeds when the vehicle is at different speeds, can perform a function of forced lubrication through both clockwise and counterclockwise rotating, can meet the lubrication of the axle gearbox no matter when the rail vehicle runs forwards, backwards or at different speeds and greatly improves the reliability of the axle gearbox and the running safety of the vehicle.

The invention discloses an improved gear oil composition which is prepared from the following raw materials in parts by weight: 36-44 parts of 38# cylinder oil, 0.5-0.9 part of BHT (butylated hydroxytoluene) antioxidant, 3-6 parts of di-n-butyl phosphite, 2-8 parts of sulfur-phosphorous butyl octanol zinc salt, 0.6-0.9 part of sodium petroleum sulfonate, 3-8 parts of chlorinated paraffin wax, 9-15 parts of dithiodipropionate, 5-15 parts of p-phenylenediamine, 5-15 parts of dibenzyl disulfur, 4-12 parts of polydimethylsiloxane, 9-16 parts of benzotriazole, 15-25 parts of synthetic oil and 3-12 parts of graphite. The improved gear oil composition can achieve maximum nonseizure load for lubrication and reduce the sintering load and comprehensive abrasion by reducing the abrasion loss of the automobile gear, and has the advantages of excellent abrasion resistance, excellent corrosion resistance and excellent rust resistance.

The invention discloses a power-closed small angle intersecting shaft gear test bench which comprises an electric motor, an auxiliary gear box, a moving platform, a rotating platform and intermeshingtest gear I and test gear II. Each part of the test bench constitutes a power-closed system to compensate for lost power. The movement of one test gear in directions of two degrees of freedom of X andY is achieved through the moving platform, the angular rotation of the other test gear is achieved through the rotating platform, the parallel shaft installation of a thickened gear and the intersection shaft installation in a certain angle range can be satisfied, and a shaft crossing angle error and a mounting distance error of the thickened gear are simulated. The contact spot, transmission error, transmission efficiency, vibration and the like of the high-speed thickening gear can be tested. At the same time, the test bench also be used for studying the influence of the shaft crossing angle error and the mounting distance error on the meshing performance of the thickened gear.

The invention discloses a hybrid transmission. The hybrid transmission is characterized in that a planetary gear transmission mechanism is connected with a power output mechanism, and the power outputmechanism is connected with a flange plate located at the other end of a transmission shell through an output shaft; a two-gear parallel shaft gear transmission mechanism is connected with the poweroutput mechanism; a generator transmission mechanism is connected with the planetary gear transmission mechanism; a locking mechanism is used for locking an engine input shaft; and after the engine input shaft is locked, a generator can sequentially output power through the generator transmission mechanism, the planetary gear transmission mechanism, the power output mechanism and the output shaft.According to the hybrid transmission, the hybrid drive of a drive motor and the generator can be realized, the double-motor drive is formed, the output torque of the two motors is coupled through a planetary differential mechanism, the maximum torque is output, and the power performance of the whole vehicle is greatly enhanced.

The invention relates to a rolling oil composition used for a twelve-high reversing cluster mill; the rolling oil composition belongs to the field of metallurgical steel rolling oil products, and comprises the components according to weight percent as follows: 60-70 percent of compound neopentyl polyol ester, 14-28 percent of mineral oil, 1-5 percent of phosphorus-containing extreme-pressure and anti-wear agent, 1-5 percent of sulfur-containing extreme-pressure and anti-wear agent, 2-12 percent of compound emulsifier, 1-3 percent of anti-rust agent, 1-3 percent of antioxidant and 0.01-0.5 percent of defoamer; the rolling oil composition takes the compound neopentyl polyol ester synthetic ester with excellent lubricating performance as the lubricating basic component; an oiliness agent main body with high lubricating performance and high extreme-pressure and anti-wear performance is composed by adding the scientific components of the phosphorus-containing and the sulfur-containing extreme-pressure and anti-wear agents; and the anti-rust performance and the emulsion stability are ensured by adopting the mineral oil, the anti-rust oil, the emulsifier and the antioxidant with the appropriate proportion for coordination, thereby creatively solving the contradiction between the lubricating performance and the detergence, ensuring the requirements on the lubricating performance of the quality when rolling steel plates with thin specifications, protecting the lubricating requirements of back-up bearings and ensuring the volatility and the annealing detergence under the cleaning-free condition.

The invention discloses an intermediate shaft structure of a gearbox, and relates to the technical field of gearboxes of motor vehicles. The structure solves the technical problem that an NHV index ofa vehicle is low due to unreasonable structural design of an intermediate shaft of a gearbox in the prior art. The structure comprises a shaft body, and an oil guide device, wherein the shaft body isconnected to a first bearing and a second bearing, and the shaft body is provided with an axially-through cavity; and the oil guide device is connected between the shaft body and a gearbox shell, andthe oil guide device is provided with a first oil guide channel and a second oil guide channel. According to the structure, the first oil guide channel in the oil guide device can enable oil to flowinto the first bearing through the cavity in the shaft body, so that lubrication of the first bearing is met, the oil liquid directly meets lubrication of the second bearing through the second oil guide channel, the simple oil guide device structure design meets sufficient lubrication of the first bearing and the second bearing, meanwhile, the problem that a complex oil guide pipeline is designedin an intermediate shaft or a bearing is solved, the NHV of the gearbox is improved, and the production and manufacturing of the intermediate shaft are facilitated, and the cost is reduced.

A method for pumping high-sand-rate premixed mortar in a gravity self-pressure separation prevention mode comprises the steps that a mortar suction valve is arranged below a mortar suction hopper; mortar materials from the mortar suction hopper enter a cylinder tube of a conveying cylinder through the mortar suction valve under the mutual action of the gravity self-pressure and the suction force of a piston; the mortar materials in the cylinder tube are smoothly discharged through a mortar outlet valve in the mortar material flowing line direction, wherein the mortar outlet valve and the conveying cylinder are in the same direction, the discharging direction of the mortar materials is straight, and the flow direction is basically not changed. According to the method, the mortar suction valve is arranged below the mortar suction hopper, the mortar can be directly sucked from the bottom of the hopper, the mortar materials enter the cylinder tube under the double action of the gravity self-pressure and the suction force of the piston, the mortar suction resistance is greatly reduced, separation is not likely to happen in the mortar suction-in process, the mortal materials which are low in fluidity or include large aggregates can be sucked in, and the mortar suction capability is greatly improved.

The invention provides environmentally-friendly energy-saving-type heavy loading screw compressor oil. The environmentally-friendly energy-saving-type heavy loading screw compressor oil comprises 90-95% of composite base oil and 10%-5% of other additives in percentage by weight. Poly Alpha-Olefins (PAO) and dioctyl sebacate are compounded to serve as the base oil of the environmentally-friendly energy-saving-type heavy loading screw compressor oil. The environmentally-friendly energy-saving-type heavy loading screw compressor oil provided by the invention has the advantages of good operating characteristics, long service life and good biodegradability and also has effects of improving the efficiency of a screw compressor, reducing the abrasion and corrosion of a screw, effectively prolong the service life and the oil draining period of the screw compressor and meeting the requirements under special service conditions. The environmentally-friendly energy-saving-type heavy loading screw compressor oil provided by the invention is not only suitable for the requirements of various middle-heavy loading screw compressors under service conditions, and but also can meet the lubrication, cooling and sealing requirements of the middle-heavy loading sliding vane compressors.

The invention relates to polyurea calcium acetate lubricating grease and a preparation method thereof. The polyurea calcium acetate lubricating grease comprises the following components in percentage based on the total weight of the raw materials of the lubricating grease: 25-63% of base oil, 3-5% of 4,4'-methylene bis(phenyl isocyanate), 2-10% of organic amine, 20-55% of high-base-number calcium sulfonate, 10-15% of glacial acetic acid, 0.1-1% of antioxidant and 0.01-0.3% of corrosion inhibitor. Meanwhile, the invention also provides a preparation method realizing high yield and good quality. Compared with the common extreme pressure lithium-based lubricating grease and extreme pressure complex lithium-based lubricating grease, the polyurea calcium acetate lubricating grease provided by the invention has excellent anti-wear extreme pressure performance, antirust performance, colloid stability and water resistance without adding the additives such as extreme pressure anti-wear additives, antirust agents and the like.