CN201206974Y - High-pressure microgap lubricating test machine - Google Patents

Abstract

A high-pressure micro-clearance lubrication testing machine, including a support table and a lifting table. There is an oil tank on the lifting table, and a T-shaped main shaft is inserted in the oil tank. A ceramic sleeve is installed on the outer diameter of the main shaft head. The outer diameter of the ceramic sleeve is right There is a ceramic ball close to its circumferential surface on the side, and a high-precision eddy current sensor is installed under the ceramic ball to sense the gap between it and the ceramic sleeve. A loading device is installed on the right side of the ceramic ball, and a ceramic shaft is fixed on the ceramic ball. It is fixed by precision double-row self-aligning ball bearings, connected with the flexible shaft connected to the torque sensor, and the buckle torque sensor is connected with the servo motor and set on the support platform; the tail of the main shaft is connected with the servo motor set on the support platform through a coupling. By controlling the maximum contact pressure, interface gap, and shear rate between the ceramic ball and the ceramic sleeve, evaluate the bearing capacity and rheological properties of the material under high-pressure micro-gap, and provide experimental data and lubricating anti-wear materials for the establishment of lubrication models under micro-gap Choose to provide a solution.

Description

High pressure micro gap lubrication testing machine

technical field

The utility model relates to a high-pressure micro-gap lubrication testing machine, which is a kind of lubricating film in a micro-gap of 1-100nm in real time under the conditions of high pressure of 0-3GPa and high shear rate of 10 ⁸ -10 ⁹ /s. Testing machine for thickness, friction and temperature.

Background technique

In aerospace, ultra-precision machinery and other fields, the movement accuracy and manufacturing accuracy of many key components need to reach the submicron or even nanometer level, accompanied by high load point and line contact; the corresponding friction pair clearance will reach 1-100nm nanometer level level, the pressure reaches 3GPa, and the shear rate reaches 10 ⁸ -10 ¹⁰ /s. The behavior and failure rules of lubricating materials in the micro-gap no longer conform to the macroscopic lubrication theory; high shear rate will cause the molecular chain of lubricating materials to break; high pressure will cause the breakdown of lubricating film. These behaviors will cause the lubrication failure of the friction pair, and in severe cases, the entire system will be paralyzed. Therefore, a high-pressure micro-gap lubrication test system is established to explore the behavioral law, scale effect, failure mechanism and control method of lubricating materials in high-pressure, high-shear rate, and micro-gap, and to ensure the stability, reliability and economy of the system. is very meaningful.

At present, the test systems for researching the behavior of lubricating materials mainly include: lubrication characteristic monitoring system, lubricant performance monitoring system, and surface lubrication system. In terms of lubrication characteristic monitoring system: Patent No. 200410018436 discloses a test device for the lubrication characteristics of the distribution pair of axial piston pumps, which is loaded by hydraulic power, and the lubricating film test platform is used to test and study the lubrication characteristics of the distribution pair under different working conditions , real-time monitoring, collection, analysis and processing of test data, to realize feedback control of micron-level lubricating film thickness in the lubrication test system. Patent No. 89217503 discloses an intelligent lubrication monitoring device, which is used for fault monitoring and control of dry oil and thin oil lubrication systems, and program control of machines. Patent No. 97219302 discloses a lubricating oil flow monitor, which is suitable for lubrication monitoring of large-scale machinery and equipment such as mines, metallurgy, and power generation; The operating status of the compressor connecting rod shoe, and whether it needs to be repaired is determined through data processing. Lubricant performance monitoring system: Patent No. 200620088031.8 discloses a friction and wear lubricant testing machine using industrial computer automatic control, which can observe the test results of lubricant friction and wear performance in real time, and can perform multiple test data Comparative research; Patent No. 94224975.5 discloses a four-ball lubricant testing machine, which can measure the anti-wear, anti-friction, anti-scratch performance and mechanical shear stability of lubricants, and is used in conjunction with intelligent instruments , which can meet the evaluation of various performances of lubricants. The patent No. CN03227041.0 discloses a hydraulic jack type lubrication and wear testing machine, which uses hydraulic pressure to measure lubrication and wear with high accuracy and stable operation; surface lubrication system: Patent No. 96191699 discloses a rotary compressor with low lubrication sensitivity, and applies a diamond-type carbon coating to the parts that are worn out due to lubrication failure to alleviate lubrication performance; Patent No. 200520012678 discloses a universal joint lubrication mechanism for In universal joints, this mechanism has the characteristics of large oil storage capacity, convenient oil filling, and high reliability of universal joints.

Although the lubrication test institutions disclosed in the above-mentioned patent documents all carry out real-time monitoring and timely feedback control on the friction and wear performance and lubrication characteristics of the lubricant, or enhance the lubrication performance through surface treatment, the lubricating materials studied are all under normal conditions. The monitoring and research of lubrication characteristics and friction and wear performance, but the bearing capacity and rheological characteristics of lubricating materials under the conditions of high pressure, high shear rate and micro gap have not yet been studied.

Utility model content

Technical problem: The purpose of this utility model is to provide a high-pressure micro-gap lubrication testing machine to explore the bearing capacity and rheological properties of lubricating materials under high-pressure micro-gap conditions.

Technical solution: The high-pressure micro-gap lubrication testing machine of the utility model is composed of a support platform and a test device arranged on the support platform. The support platform is connected by a base, a support rod and a support platform; the test device includes a There is an oil tank on the lifting table, a T-shaped main shaft is inserted into the oil tank, a ceramic sleeve is installed on the outer diameter of the main shaft head, and a ceramic ball close to its peripheral surface is installed on the right side of the ceramic sleeve. There is a high-precision eddy current sensor at the bottom to sense the gap between it and the ceramic sleeve, and a loading device is installed on the right side of the ceramic ball. The ceramic ball with the ceramic shaft is provided with a flexible shaft connected to the torque sensor. The ceramic shaft is supported and aligned by a precision double-row self-aligning bearing. The torque sensor is connected to the servo motor and set on the support platform; the tail of the main shaft protruding from the fuel tank cover It is connected with the servo motor on the support platform through a coupling; the support platform is equipped with an intelligent temperature controller and a bidirectional thyristor.

The main shaft is provided with a baffle plate with a fixed ceramic sleeve; the high-precision eddy current sensor is arranged in an insulating shell fixed on the supporting tapered support; The loading plate at the front of the displacement platform, the supporting tapered support and the fixed seat supporting the tapered support are composed of a ceramic bearing that withstands the ceramic ball on the conical surface of the supporting tapered support; the loading device is provided with There is a piezoelectric sensor; a thermocouple thermometer and a heating plate are installed in the oil tank; a cup-shaped shell is provided outside the connecting section between the tail of the main shaft and the coupling; the tail of the main shaft and the cup-shaped shell are Rolling bearings are arranged between them; the fuel tank is provided with a fuel tank cover, and an oil pipe inserted into the fuel tank for oil injection or oil extraction is arranged on the cover.

Beneficial effects: the high-pressure micro-gap lubrication testing machine of the utility model can evaluate the bearing capacity, Rheological properties, etc., can provide experimental data for the establishment of lubrication models under micro-gap, and provide solutions for lubrication, anti-wear and material selection under high-pressure micro-gap lubrication conditions.

Description of drawings

Accompanying drawing is the structural diagram of the high-pressure micro-gap lubrication testing machine of the present invention;

In the figure: servo motor—1, torque sensor—2, support platform—3, flexible shaft—4, oil pipe—5, ceramic ball—6, conical support—7, fixed seat—8, piezoelectric sensor— 9. Loading plate—10, electric translation stage—11, bracket—12, insulating shell—13, high-precision eddy current displacement sensor—14, base—15, lifting table—16, heating plate—17, baffle plate—18 , oil tank—19, screw—20, ceramic sleeve—21, sealing cover—22, main shaft—23, thermocouple thermometer—24, housing—25, coupling—26, intelligent temperature controller—27, servo motor —28, Triac —29.

Detailed ways

The utility model will be further described below in conjunction with the embodiment in the accompanying drawings:

As shown in the accompanying drawings, the high-pressure micro-gap lubrication testing machine is mainly composed of a support platform and a test device located on the support platform. The support platform is connected by a base 15, a support platform 3, a support platform 12 and a support rod therebetween. Including the lifting table 16 fixed on the base 15, the oil tank 19 is placed on the lifting table 16, a T-shaped main shaft 23 is inserted in the oil tank 19, and a ceramic sleeve 21 is installed on the outer diameter of the head of the main shaft 23, and the ceramic sleeve 21 adopts SiC ceramics. The end face of the main shaft 23 is equipped with a stop plate 18 fixed by a screw 20, and the right side of the SiC ceramic sleeve 21 is provided with a ceramic ball 6 close to its peripheral surface, and a high-precision electric circuit for sensing the gap between the ceramic ball 6 and the ceramic sleeve 21 is arranged below the ceramic ball 6. The eddy current sensor 14, the high-precision eddy current sensor 14 is arranged in the casing 13, and is fixed on the tapered support 7. The ceramic ball 6 adopts Si ₃ N ₄ ceramics, and the right side of the Si ₃ N ₄ ceramic ball 6 is provided with a loading device. Fuel tank 19 is provided with fuel tank cover 22, between fuel tank cover 22 and fuel tank 19, is sealed by plane sealant, and fuel tank cover 22 is provided with the oil pipe 5 that inserts the oil filling in the fuel tank 19 or oil extraction. The bottom of the fuel tank 19 is provided with a heating sheet 17, the sealing cover 22 of the fuel tank is provided with a thermocouple thermometer 24, and the support platform 3 is provided with an intelligent temperature controller 27 and a triac 29. The loading device consists of an electric displacement platform 11, a loading plate 10 located at the front of the electric displacement platform 11, a supporting tapered support 7 and a fixing seat 8 supporting the tapered support 7. The loading plate 10 is fixed on the electric displacement platform by screws. 11, the conical surface supporting the conical support 7 is provided with a ceramic bearing to withstand the Si ₃ N ₄ ceramic ball 6, and a pressure sensor 9 is provided on the loading device. The top position of the Si ₃ N ₄ ceramic ball 6 bonded with a ceramic shaft is provided with a flexible shaft 4 connected to the torque sensor 2. The ceramic shaft is supported and aligned by high-quality precision double-row self-aligning ball bearings. The torque sensor 2 and the servo motor 1 is connected and set on the support platform 3; the servo motor 28 is erected on the support platform 3, the coupling 26 connects the output shaft of the servo motor 28 with the tail of the main shaft 23 protruding from the fuel tank cover 22, and the SiC ceramic sleeve 21 is installed on the main shaft 23 The SiC ceramic sleeve on the output shaft, the lower half of its outer surface is plated with induction medium copper, the cup-shaped housing 25 is fixed between the support platform 3 and the fuel tank cover 22 by screws; the tail of the main shaft 23 and the cup-shaped housing 25 There are rolling bearings between them.

In the experiment, the oil in the oil tank is injected and extracted through the oil injection (pumping) pipe 5 through the reversible pump, and the lifting table 16 realizes the rise and fall of the oil tank 19 by adjusting the height, so as to achieve the purpose of injecting part of the oil and cleaning the oil tank The servo motor 28 of the main shaft system directly transmits the power to the main shaft 23 through the shaft coupling 26, and the SiC ceramic sleeve 21 rotates at a high speed with the main shaft 23. , Piezoelectric sensor 9, supporting the output shaft of the tapered support 7, and then applying a pre-stressed force to the Si ₃ N ₄ ceramic ball 6 on the supported tapered support 7, the applied size of the pre-stressed force is determined by the piezoelectric sensor 9 measured; at this time, the Si ₃ N ₄ ceramic ball 6 and the SiC ceramic sleeve 21 are immersed in the oil tank oil, and the Si ₃ N ₄ ceramic ball 6 is in contact with the SiC ceramic sleeve 21 under the action of pre-applied force, and the SiC ceramic sleeve 21 The oil liquid thrown off by the high-speed rotation forms a micro-gap lubricating film between the Si ₃ N ₄ ceramic ball 6 and the SiC ceramic sleeve 21 that can withstand high pressure and high shear rate, so that the Si ₃ N ₄ ceramic ball 6 produces relative displacement, and its The relative displacement is measured by a high-precision eddy current displacement sensor 14 that can work in oil, which produces an eddy current effect on the copper medium at the lower part of the SiC ceramic sleeve 21 to complete the measurement of the film thickness. The ceramic shaft and the ceramic ball 6 make a micro gap Offset, and self-aligning by high-quality precision double-row self-aligning ball bearings; in addition, the emergence of lubricating film, Si ₃ N ₄ ceramic ball 6-SiC ceramic sleeve 21 produces rolling friction force, rolling friction force is indirectly measured by Si The torque of ₃ N ₄ ceramic balls 6 is realized, Si ₃ N ₄ ceramic balls 6 and SiC ceramic sleeves 21 perform opposite rotation, and the torque generated by the rotation of Si ₃ N ₄ ceramic balls 6 is transmitted to the torque sensor 2 through the flexible shaft 4, and the obtained The torque value of the Si ₃ N ₄ ceramic ball 6, and then theoretically calculate the rolling friction force between the Si ₃ N ₄ ceramic ball 6-SiC ceramic sleeve 21; the temperature control system can control the temperature in real time, through the thermocouple thermometer 24 The output signal voltage of the sensed temperature change is transmitted to the intelligent temperature controller 27, and the deviated voltage signal is regulated by PID. When the temperature is lower or higher than the set value, the bidirectional thyristor 29 is turned on with zero trigger, and the heating element 17 is driven and controlled. Feedback compensation is performed so that the experiment is performed at the set temperature.

Claims (9)

1. heavy pressure micro-gap lubrication test machine is characterized in that: it is made of brace table and the test unit that is located on the brace table, and brace table is formed by connecting by base (15), support bar, support platform (3) and support platform (12); Test unit comprises the self-powered platform (16) that is located on the base (15), self-powered platform (16) is provided with fuel tank (19), be inserted with T-shaped main shaft (23) in the fuel tank (19), on main shaft (23) head outer diameter ceramic jacket (21) is housed, ceramic jacket (21) right side is provided with the Ceramic Balls (6) near its periphery, Ceramic Balls (6) below is provided with the high precision current vortex sensor (14) in induction itself and ceramic jacket (21) gap, the right side of Ceramic Balls (6) is provided with charger, the front portion of charger is located in the fuel tank (19), the rear portion extends to outside the fuel tank (19), is supported on the support (12); Be fixed with on the Ceramic Balls (6) of ceramic shaft and be made as the flexible axle (4) that links to each other with torque sensor (2), torque sensor (2) links to each other with servomotor (1) and is located on the support platform (3); Main shaft (23) afterbody that stretches out fuel tank cap (22) links by shaft coupling (26) and the servomotor (28) that is located on the support platform (3); Support platform (3) is provided with intelligent temperature controller (27) and bidirectional triode thyristor (29).

2. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: described main shaft (23) is provided with the fixedly block plate (18) of ceramic jacket (21).

3. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: described high precision current vortex sensor (14) is located in the shell (13) that is fixed on the supporting taper bearing (7).

4. heavy pressure micro-gap lubrication test machine according to claim 1, it is characterized in that: described charger is by electricity driving displacement platform (11), the holder (8) that is located at the anterior load plate (10) of electricity driving displacement platform (11), taper bearing (7) and supporting taper bearing (7) constitutes, and the conical surface of taper bearing (7) is provided with the ceramic bearing that withstands Ceramic Balls (6).

5. according to claim 1 or 4 described heavy pressure micro-gap lubrication test machines, it is characterized in that: described charger is provided with piezoelectric transducer (9).

6. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: be provided with thermocouple thermometer (24) and heating plate (17) in the described fuel tank (19).

7. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: described main shaft (23) afterbody and shaft coupling (26) linkage section outside are provided with cup-shaped housing (25).

8. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: be provided with rolling bearing between described main shaft (23) afterbody and the cup-shaped housing (25).

9. heavy pressure micro-gap lubrication test machine according to claim 1 is characterized in that: establish fuel tank cap (22) on the described fuel tank (19), fuel tank cap (22) is provided with inserts the interior oiling of fuel tank (19) or the oil pipe (5) of oil pumping.

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