Grease temperature rise test evaluation device based on ultra-high speed bearing rig and method thereof

Abstract

The application relates to a grease temperature rise test evaluation device based on a super-speed bearing bench and a method thereof, which comprises a main base, a driving system, a bearing tool clamp and a pneumatic loading system which are sequentially installed on the main base, one end of the bearing tool clamp is in transmission connection with the driving system through a shaft coupling, the other end is provided with the pneumatic loading system, the driving system, the bearing tool clamp and the pneumatic loading system are coaxially arranged and are all connected to a control box. The main base is made of gray cast iron and is stable, reliable, good in vibration absorption and suitable for high-speed operation environment. The driving system is a power unit and is a high-speed motor shaft which drives a test main shaft in the bearing tool clamp to rotate. An elastic shaft coupling is arranged between the motor shaft and the test main shaft, and the mutual interference between the driving system and the bearing tool clamp can be effectively avoided.

Description

Technical Field

[0001] The present invention relates to a grease temperature rise test evaluation device and method based on an ultra-high-speed bearing stand, which are used to test the temperature rise performance of grease in a bearing. Background Art

[0002] Grease-lubricated bearings are widely used because they form a strong lubricating film that can withstand heavy loads, is not easily lost, is easy to seal, and can last for a long time after a single grease application. However, due to the high viscosity of grease, it is generally only suitable for use with lower dn values.

[0003] With the increasing sophistication of high-speed bearings and greases, temperature rise performance has become a crucial indicator for evaluating grease performance. When bearings operate at high speeds, the stirring and shearing effects of the rolling elements, as well as the friction between the balls and the inner and outer ring raceways, generate significant heat. This heat increases the bearing temperature, causing the grease to evaporate and dry out, accelerating grease aging and failure, and ultimately shortening the bearing's service life. Studies have shown that for every 10°C to 15°C increase in bearing temperature, the grease's service life decreases by approximately 50%. Grease service life is a crucial indicator for evaluating a grease's overall performance. Therefore, only by controlling the bearing's temperature rise within a reasonable range can long-term, stable operation of the bearing be guaranteed. Summary of the Invention

[0004] In order to overcome the defects of the prior art, the present invention provides a grease temperature rise test evaluation device and method based on an ultra-high-speed bearing stand. The technical solution of the present invention is:

[0005] A grease temperature rise test and evaluation device based on an ultra-high-speed bearing stand includes a main base and a drive system, a bearing fixture, and a pneumatic loading system installed on the main base in sequence. One end of the bearing fixture is connected to the drive system through a coupling, and the other end is installed with the pneumatic loading system. The drive system, bearing fixture, and pneumatic loading system are coaxially arranged and are all connected to a control box.

[0006] The drive system includes an electric spindle seat, an electric spindle and an expansion sleeve. The electric spindle is arranged in the horizontal direction and is fixedly installed on the electric spindle seat through the expansion sleeve. There are two expansion sleeves, one of which is close to one end of the electric spindle seat and the other is close to the other end of the electric spindle seat. The electric spindle is driven by a frequency converter; the output end of the electric spindle is connected to the input end of the coupling.

[0007] The bearing fixture includes a test shaft seat, a test spindle, a pressure cover, a bearing sleeve and an axially stressed pressure cover. A center hole for installing the test spindle is provided in the middle of the test shaft seat. The test spindle is coaxially arranged with the electric spindle. A bearing is installed on the test spindle. The bearing is installed on the test shaft seat through a bearing sleeve. One end of the test spindle is connected to the output end of the coupling, and the pressure cover is installed between the coupling and the test shaft seat; an axially stressed pressure cover is installed on the other end of the test spindle, and a heating unit connected to the control box is also provided on the test shaft seat, and the heating unit is close to the bearing.

[0008] The heating unit includes a temperature sensor, a heating ring and an insulating ring. The heating ring and the insulating ring are installed on the inner wall of the test shaft seat. The insulating ring is arranged on one side of the heating ring and is adjacent to the heating ring; the temperature sensor is installed on the insulating ring, and the collection end of the temperature sensor extends to the outer ring of the bearing.

[0009] The pneumatic loading system is a cylinder, the piston rod of the cylinder corresponds to the axially stressed pressure cover, and the cylinder is fixedly mounted on the test shaft seat by bolts.

[0010] A grease temperature rise test evaluation method based on an ultra-high-speed bearing test bench includes the following steps: starting an electric spindle according to a pre-set program, the electric spindle being driven by a frequency converter, and when the electric spindle rotates, driving a test spindle to rotate via a coupling; the piston rod of the cylinder simultaneously extends outward to apply pressure to an axially stressed gland, at which time the bearing is subjected to an axial load, and the temperature of the bearing outer ring is read by a temperature sensor; the speed of the electric spindle is adjusted in a step-by-step manner.

[0011] The speed adjustment method of the electric spindle is specifically as follows: a starting speed is set, each step increases one by one at a fixed number of revolutions, and each step runs for a preset time, and runs at a constant speed after reaching the set maximum speed.

[0012] The advantages of the present invention are: the main base is cast in gray cast iron, which is stable and reliable, has good vibration absorption performance, and is suitable for high-speed operation environments. The drive system uses a high-speed electric spindle as a power unit to drive the test spindle in the bearing fixture to rotate. The electric spindle and the test spindle are connected by an elastic coupling, which can effectively avoid mutual interference between the drive system and the bearing fixture. As a test unit, the bearing fixture adopts a horizontal bridge structure with a relatively simple structure and stable torque transmission. The pneumatic loading system is fixed to the other side of the fixture with bolts to provide axial load for the test unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] FIG1 is a schematic diagram of the main structure of the present invention.

[0014] FIG2 is a schematic diagram of the specific structure of FIG1 .

[0015] FIG3 is a cross-sectional view of the bearing fixture in FIG1 . DETAILED DESCRIPTION

[0016] The present invention will be further described below with reference to specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are merely exemplary and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solutions of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, and such modifications and replacements fall within the scope of protection of the present invention.

[0017] Referring to Figures 1 to 3, the present invention relates to a grease temperature rise test and evaluation device based on an ultra-high-speed bearing stand, comprising a main body base 1 and a drive system 3, a bearing fixture 2, and a pneumatic loading system 5 sequentially installed on the main body base 1. One end of the bearing fixture is connected to the drive system 3 through a coupling 4 (elastic coupling), and the other end is equipped with the pneumatic loading system 5. The drive system 5, the bearing fixture 2, and the pneumatic loading system 5 are coaxially arranged and are all connected to a control box.

[0018] The drive system includes an electric spindle seat 32, an electric spindle 31 and an expansion sleeve 33. The electric spindle 31 is arranged in the horizontal direction and is fixedly mounted on the electric spindle seat 32 by the expansion sleeve 33. There are two expansion sleeves 33, one expansion sleeve 33 is close to one end of the electric spindle seat 32, and the other expansion sleeve 33 is close to the other end of the electric spindle seat 32. The electric spindle 31 is driven by a frequency converter; the output end of the electric spindle 31 is connected to the input end of the coupling 4.

[0019] The bearing fixture includes a test shaft seat 214, a test spindle 213, a pressure cover 28, a bearing sleeve 211 and an axially stressed pressure cover 212. A center hole for installing the test spindle 213 is provided in the middle of the test shaft seat 214. The test spindle 213 is coaxially arranged with the electric spindle 31. A bearing 29 is installed on the test spindle 213. The bearing 29 is installed on the test shaft seat 214 through a bearing 211 sleeve. One end of the test spindle 213 is connected to the output end of the coupling 4, and the pressure cover 28 is installed between the coupling 4 and the test shaft seat 214; the other end of the test spindle 213 is installed with an axially stressed pressure cover 212, and a heating unit connected to the control box is also provided on the test shaft seat 214, and the heating unit is close to the bearing 29.

[0020] The heating unit includes a temperature sensor 210, a heating ring 27 and an insulating ring 26. The heating ring 27 and the insulating ring 26 are installed on the inner wall of the test shaft seat 214. The insulating ring 26 is arranged on one side of the heating ring 27 and is adjacent to the heating ring 27; the temperature sensor 210 is installed on the insulating ring 26, and the collection end of the temperature sensor 210 extends to the outer ring of the bearing 29.

[0021] The pneumatic loading system 5 is a cylinder 51 , the piston rod of the cylinder 51 corresponds to the axially stressed pressure cover 212 , and the cylinder 51 is fixedly mounted on the test shaft seat 214 by bolts.

[0022] The present invention also relates to a grease temperature rise test evaluation method based on an ultra-high-speed bearing stand, comprising the following steps: starting an electric spindle according to a pre-set program, the electric spindle being driven by a frequency converter, and when the electric spindle rotates, the test spindle is driven to rotate through a coupling; the piston rod of the cylinder simultaneously extends outward to apply pressure to the axially stressed pressure cover, at which time the bearing is subjected to an axial load, and the temperature of the bearing outer ring is read through a temperature sensor; the speed adjustment method of the electric spindle is a step-by-step increase.

[0023] The speed adjustment method of the electric spindle is specifically as follows: a starting speed is set, each step increases one by one at a fixed number of revolutions, and each step runs for a preset time, and runs at a constant speed after reaching the set maximum speed.

[0024] Operation has proven that step-by-step speed increase can better differentiate the grease under high-speed and light-load conditions.

[0025] The main base of the present invention is cast in gray cast iron, which is stable and reliable, has good vibration absorption performance, and is suitable for high-speed operation environments. The drive system adopts a high-speed electric spindle as a power unit to drive the test spindle in the fixture to perform rotational motion. The electric spindle and the test spindle are connected by an elastic coupling. The mutual interference between the drive system and the bearing fixture can be effectively avoided. As a test unit, the fixture adopts a horizontal bridge structure with a relatively simple structure and stable torque transmission. The pneumatic loading system is fixed to the other side of the fixture with bolts to provide axial load for the test unit.

[0026] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A grease temperature rise test and evaluation device based on an ultra-high-speed bearing stand, characterized in that: It includes a main body base and a drive system, a bearing fixture and a pneumatic loading system installed on the main body base in sequence. One end of the bearing fixture is connected to the drive system through a coupling, and the other end is installed with the pneumatic loading system. The drive system, bearing fixture and pneumatic loading system are coaxially arranged and connected to the control box. The bearing fixture includes a test shaft seat, a test spindle, a pressure cover, a bearing sleeve and an axially stressed pressure cover. A center hole for installing the test spindle is provided in the middle of the test shaft seat. The test spindle is coaxially arranged with the electric spindle. A bearing is installed on the test spindle. The bearing is installed on the test shaft seat through a bearing sleeve. One end of the test spindle is connected to the output end of the coupling, and the pressure cover is installed between the coupling and the test shaft seat; the other end of the test spindle is installed with an axially stressed pressure cover, and a heating unit connected to the control box is also provided on the test shaft seat, and the heating unit is close to the bearing.

2. The grease temperature rise test evaluation device based on the ultra-high-speed bearing stand according to claim 1 is characterized in that: The drive system includes an electric spindle seat, an electric spindle and an expansion sleeve. The electric spindle is arranged in the horizontal direction and is fixedly mounted on the electric spindle seat by the expansion sleeve. There are two expansion sleeves, one of which is close to one end of the electric spindle seat and the other is close to the other end of the electric spindle seat. The electric spindle is driven by a frequency converter; the output end of the electric spindle is connected to the input end of the coupling.

3. The grease temperature rise test and evaluation device based on the ultra-high-speed bearing stand according to claim 2 is characterized in that: The heating unit includes a temperature sensor, a heating ring and an insulating ring. The heating ring and the insulating ring are installed on the inner wall of the test shaft seat. The insulating ring is arranged on one side of the heating ring and is adjacent to the heating ring; the temperature sensor is installed on the insulating ring, and the collection end of the temperature sensor extends to the outer ring of the bearing.

4. The grease temperature rise test evaluation device based on the ultra-high-speed bearing stand according to claim 2 or 3, characterized in that: The pneumatic loading system is a cylinder, the piston rod of the cylinder corresponds to the axially stressed pressure cover, and the cylinder is fixedly mounted on the test shaft seat by bolts.

5. A method for evaluating the temperature rise of a grease based on an ultra-high-speed bearing stand, based on the device for evaluating the temperature rise of a grease based on an ultra-high-speed bearing stand according to claim 4, characterized in that: The method includes the following steps: starting the electric spindle according to a pre-set program, which is driven by a frequency converter. When the electric spindle rotates, the test spindle is driven to rotate through a coupling; the piston rod of the cylinder extends outward at the same time to apply pressure to the axially stressed pressure cover. At this time, the bearing is subjected to axial load, and the temperature of the bearing outer ring is read through a temperature sensor; the speed adjustment method of the electric spindle is a step-by-step increase.

6. The grease temperature rise test evaluation method based on the ultra-high-speed bearing stand according to claim 5 is characterized in that: The speed adjustment method of the electric spindle is specifically as follows: a starting speed is set, each step increases one by one at a fixed number of revolutions, and each step runs for a preset time, and runs at a constant speed after reaching the set maximum speed.

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