High-speed bearing oil pick-up rate automatic testing system and method based on volume method

Abstract

The present application relates to the technical field of high-speed bearing test, in particular to a high-speed bearing oil collection rate automatic test system and method based on volume method, which comprises a rotating shaft system unit and an oil collection unit; the rotating shaft system unit comprises an oil baffle, a stop piece, a rotating shaft, an oil collection nut, a slip ring, a nozzle, a bearing, a bearing seat, a shell and an oil accumulation spacer; the oil accumulation spacer, the slip ring, the stop piece and the oil collection nut are installed on the rotating shaft, the inner ring of the bearing is fixed on the slip ring, and the outer ring of the bearing is fixed on the bearing seat through screws; the oil collection cover and the oil baffle are respectively installed on the left and right end faces of the bearing seat, and the nozzle is fixed on the right side of the bearing seat; the high-speed bearing oil collection rate automatic test system and method have high measurement precision and high automation degree, adopt a high-precision liquid level sensor and a measuring oil tank with a known cross-sectional area, and automatically and continuously measure through the volume method, so that the manual measurement error is eliminated.

Description

Technical Field

[0001] This invention relates to the field of high-speed bearing testing technology, and specifically to an automatic testing system and method for high-speed bearing oil recovery rate based on the volumetric method. Background Technology

[0002] The "oil recovery rate" of high-speed bearings is a key indicator for evaluating the rationality of their lubrication system design. Lubricating oil not only needs to be effectively delivered to the bearing interior, but also needs to be effectively "captured" by the bearing's rotating components (such as cages and rollers) to form a lubricating film. The "oil recovery rate" is the percentage of oil actually entering the bearing for lubrication under specific operating conditions compared to the total oil supply.

[0003] The "oil recovery rate" of high-speed bearings is a key indicator for evaluating the rationality of their lubrication system design. Existing measurement methods mainly suffer from the following types and inherent limitations:

[0004] Traditional manual measuring cup method: Lubricating oil enters the bearing through the oil supply system. An oil collection cover is installed at the bearing end. A special oil pump draws the lubricating oil into a container. The volume of lubricating oil in the container per unit time is measured manually with a measuring cup, and the oil collection rate is calculated. This method is greatly affected by human factors, has low efficiency, and cannot achieve dynamic continuous measurement.

[0005] Physical isolation measurement method (such as the published patent CN116539851A): This scheme physically isolates the lubricating oil entering the bearing from the splashed lubricating oil by setting a "radial oil collection ring" in the bearing housing, forming two independent oil circuits, which are measured by flow meters separately. This scheme relies on the mechanical isolation structure (oil collection ring), which has high requirements for parts processing and assembly. At the same time, the use of dual-circuit oil circuits and multiple flow meters increases the complexity of the system and the number of failure points. If the oil pump is dry, the turbine or gear of the flow meter will still rotate and display the flow rate, affecting the accuracy of the measurement results.

[0006] Therefore, there is an urgent need for a new oil recovery rate testing technology that can guarantee high precision and automation, while also having a simple system structure, high reliability, and relatively low cost. Summary of the Invention

[0007] The purpose of this invention is to provide an automatic testing system and method for high-speed bearing oil recovery rate based on the volumetric method. This automatic testing system and method for high-speed bearing oil recovery rate has high measurement accuracy and a high degree of automation. It adopts a high-precision liquid level sensor and a measuring oil tank with a known cross-sectional area, and automatically and continuously measures the oil recovery rate through the volumetric method, thus eliminating the error of manual measurement.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] An automatic testing system for oil recovery rate of high-speed bearings based on the volumetric method includes a rotating shaft unit and an oil recovery unit;

[0010] The rotating shaft unit includes an oil baffle, a stop plate, a rotating shaft, an oil catch nut, a slip ring, a nozzle, a bearing, a bearing housing, a housing, and an oil collection sleeve. The oil collection sleeve, slip ring, stop plate, and oil catch nut are mounted on the rotating shaft. The inner ring of the bearing is fixed to the slip ring, and its outer ring is fixed to the bearing housing by screws. The oil catch cover and oil baffle are respectively mounted on the left and right end faces of the bearing housing, and the nozzle is fixed on the right side of the bearing housing.

[0011] The oil recovery unit includes an oil recovery pipe, an oil pump, an oil recovery container, and a liquid level sensor; the oil recovery pipe is connected to the oil recovery cover in the rotating shaft system unit; the oil pump is located in the middle of the oil recovery pipe and connected to the oil recovery pipe; the liquid level sensor is placed inside the oil recovery container to precisely measure the change in the liquid level height inside the oil recovery container and transmit the real-time liquid level signal to the automatic measurement and control system.

[0012] Furthermore, after the lubricating oil enters the nozzle, it is sprayed into the oil catch nut at a certain angle, and enters the bearing through the stop plate and slip ring. The lubricating oil that enters the bearing overflows from the left and right sides of the bearing. The lubricating oil coming out from the left side directly enters the oil catch shroud on the left side, while the lubricating oil coming out from the right side is blocked by the oil baffle and enters the oil catch shroud on the left side of the bearing through the oil passage on the bearing housing.

[0013] Furthermore, the oil pump is located in the middle of the oil receiving pipe and is connected to the oil receiving pipe, so that the extracted lubricating oil can be pumped into an oil receiving container with a known cross-sectional area.

[0014] Furthermore, the oil collection container is cylindrical, and the end of the oil collection pipe that enters the oil collection container is made with a beveled surface.

[0015] Furthermore, the inner ring of the bearing is interference-fitted with the shaft, and the higher the bearing speed, the more lubricating oil enters the bearing through the slip ring.

[0016] A method for an automatic testing system of oil recovery rate of high-speed bearings based on the volumetric method includes the following steps:

[0017] S1: System initialization and parameter setting: Inject the initial reference oil volume into the oil receiving container, record the initial liquid level H0, and set the test load spectrum on the automatic testing system: oil supply temperature T0 (e.g., 80℃), oil supply flow rate Q0 (e.g., 10L / min), starting speed n_start (e.g., 9000r / min), ending speed n_end (e.g., 15000r / min), speed step Δn (e.g., 1000r / min), and stable running time t_hold for each speed point;

[0018] S2: Start the programmed test: The system controls the oil supply system to run at T0 and Q0, and accelerates the shaft system with bearings to n_start;

[0019] S3: Stable measurement: After the rotational speed reaches n_start, the system maintains this operating condition for t_hold time; during this period, the measurement and control system collects liquid level data, calculates the volume change ΔV_ based on the area of ​​the existing container, and continuously calculates the instantaneous and average oil recovery rate η at this rotational speed point in combination with the oil supply flow rate Q_.

[0020] S4: Automatic working condition switching and continuous testing; when t_hold time is up, the spindle speed increases by one step Δn (to n_start+Δn), and step S3 is repeated; this process is automatically looped until the speed reaches n_end;

[0021] S5: Test Completion and Result Display: After the test, the test system automatically generates a complete characteristic curve of the oil recovery rate η changing with the rotational speed n, and can store and output the data.

[0022] Furthermore, the oil collection volume Q' = (S*Δh) / t; the oil recovery rate η: η = (Q' / Q)*100%, that is, oil collection volume / oil supply volume*100%.

[0023] The beneficial effects of this invention are as follows: Compared with existing high-speed bearing oil recovery rate testing methods, the automatic testing system and method based on the volumetric method provided by this invention have the following technical features and advantages:

[0024] 1. High measurement accuracy and high degree of automation: It adopts a high-precision liquid level sensor and a measuring oil tank with a known cross-sectional area, and automatically and continuously measures the volume using the volumetric method, eliminating the error of manual measurement;

[0025] 2. Enables continuous, uninterrupted testing: The oil pump continuously pumps the collected oil into the measuring oil tank, allowing the system to perform continuous measurements without stopping, greatly improving testing efficiency;

[0026] 3. Real-time monitoring and dynamic display: The system can calculate and display the oil recovery rate in real time. Operators can intuitively observe the dynamic process of the oil recovery rate changing with speed or time on the test system and immediately obtain the complete characteristic curve. The test results are clear at a glance. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the automatic oil recovery rate testing system for high-speed bearings of the present invention.

[0028] Figure 2 This is a schematic diagram of the rotating shaft unit structure of the high-speed bearing oil recovery rate automatic testing system of the present invention;

[0029] Figure 3 This is a schematic diagram of the oil recovery unit structure of the automatic oil recovery rate testing system for high-speed bearings of the present invention;

[0030] The numbers in the diagram are: 1-oil baffle, 2-stop plate, 3-rotating shaft, 4-oil catch nut, 5-slip ring, 6-nozzle, 7-bearing, 8-bearing seat, 9-housing, 10-oil accumulation sleeve, 11-oil catch hood, 12-oil catch pipe, 13-oil pump, 14-oil catch container, 15-liquid level sensor. Detailed Implementation

[0031] Specific Embodiment 1: The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. It should be noted that: In the present invention, unless otherwise specified, all implementation methods and preferred implementation methods mentioned herein can be combined with each other to form new technical solutions. In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form new technical solutions. The "scope" disclosed in the present invention can be in the form of a lower limit and an upper limit, and can be one or more lower limits and one or more upper limits, respectively.

[0032] As per the instruction manual Figure 1 Instruction manual attached Figure 2 and instruction manual attached Figure 3As shown, to address the problems of significant human influence, low efficiency, inability to achieve dynamic continuous measurement, and unstable measurement results in existing high-speed bearing oil recovery rate testing methods, this invention provides an automatic testing system and method for high-speed bearing oil recovery rate based on the volumetric method. This testing system and method ensure high precision and automation, while also featuring a simple system structure, high reliability, and relatively low cost. Specifically, the automatic testing system for high-speed bearing oil recovery rate based on the volumetric method of this invention mainly includes a rotating shaft system unit and an oil recovery unit. The rotating shaft system unit includes an oil baffle 1, a stop plate 2, a rotating shaft 3, an oil recovery nut 4, a slip ring 5, a nozzle 6, a bearing 7, a bearing seat 8, a housing 9, and an oil collection sleeve 10. The oil collection sleeve 1... 0. Slip ring 5, stop plate 2, and oil catch nut 4 are installed on the rotating shaft 3. The inner ring of the bearing 7 is fixed to the slip ring 5, and its outer ring is fixed to the bearing seat 8 by screws. The oil catch cover 11 and the oil baffle 1 are respectively installed on the left and right end faces of the bearing seat 8. The nozzle 6 is fixed on the right side of the bearing seat 8. The oil catch unit includes an oil catch pipe 12, an oil pump 13, an oil catch container 14, and a liquid level sensor 15. The oil catch pipe 12 is connected to the oil catch cover 11 in the rotating shaft unit. The oil pump 13 is located in the middle of the oil catch pipe 12 and is connected to the oil catch pipe 12. The liquid level sensor 15 is placed inside the oil catch container 14 to accurately measure the change in liquid level in the oil catch container 14 and transmit the real-time liquid level signal to the automatic measurement and control system.

[0033] Under specific temperature and pressure conditions, lubricating oil enters the nozzle 6 through the oil supply system, and is sprayed into the oil collection nut 4 at a set angle through the internal channel of the nozzle 6. It then flows sequentially through the stop plate 2 and the slip ring 5, and finally enters the interior of the bearing 7 through the gap in the inner ring of the bearing 7. The inner ring of the bearing 7 is interference-fitted with the shaft 3; the higher the rotational speed, the more lubricating oil enters the bearing 7 through the slip ring 5. The lubricating oil entering the bearing 7 overflows along the left and right sides of the rolling elements. The lubricating oil coming out from the left side directly enters the left-side oil collection cover 11, while the lubricating oil coming out from the right side is blocked by the oil baffle 1 and enters the left-side oil collection cover 11 of the bearing 7 through the oil passage on the bearing housing 8.

[0034] As per the appendix to the specification of this invention Figure 1 As shown, the oil receiving pipe 12 is connected to the oil receiving shroud 11 in the rotating shaft unit; the oil pump 13 is located in the middle of the oil receiving pipe 12 and is connected to the oil receiving pipe 12, pumping the lubricating oil extracted from the oil receiving shroud 11 into the oil receiving container 14 with a known cross-sectional area of ​​S. The oil receiving container 14 is cylindrical, and the end of the oil receiving pipe 12 that enters the oil receiving container 14 is made with a beveled surface. The liquid level sensor 15 is placed inside the oil receiving container 14 to precisely measure the change Δh in the liquid level height inside the oil receiving container 14 and transmit the real-time liquid level signal to the automatic measurement and control system.

[0035] The method of the automatic testing system for high-speed bearing oil recovery rate based on the volumetric method of the present invention is implemented through the following steps: S1: System initialization and parameter setting: Inject the initial reference oil volume into the oil recovery container 14, record the initial liquid level H0, and set the test load spectrum on the automatic testing system: oil supply temperature T0, oil supply flow rate Q0, starting speed n_start, ending speed n_end, speed step Δn, and stable running time t_hold for each speed point;

[0036] S2: Start the programmed test: The system controls the oil supply system to run at T0 and Q0, and accelerates the shaft system with bearing 7 to n_start;

[0037] S3: Stable measurement: After the rotational speed reaches n_start, the system maintains this operating condition for t_hold time; during this period, the measurement and control system collects liquid level data, calculates the volume change ΔV_ based on the area of ​​the existing container, and continuously calculates the instantaneous and average oil recovery rate η at this rotational speed point in combination with the oil supply flow rate Q_.

[0038] S4: Automatic working condition switching and continuous testing; when t_hold time is up, the spindle speed increases by one step Δn (to n_start+Δn), and step S3 is repeated; this process is automatically looped until the speed reaches n_end;

[0039] S5: Test Completion and Result Display: After the test, the test system automatically generates a complete characteristic curve of the oil recovery rate η changing with the rotational speed n, and can store and output the data.

[0040] Specifically, for example, when conducting the "speed-oil recovery rate" characteristic test, the operator sets the following on the operating interface: T0=80℃, Q0=10 L / min, n_start=9000 r / min, n_end=15000 r / min, Δn=1000 r / min, t_hold=180 seconds;

[0041] After the experiment began: the system first established stable oil supply conditions of T0=80℃ and Q0=10 L / min;

[0042] The bearing 7 is accelerated to 9000 r / min and runs stably; most of the oil enters the bearing 7, flows out through the oil collection cover 11, and is continuously pumped into the oil collection container 14 by the oil pump 13.

[0043] During the 180-second stabilization period, the level sensor measures the liquid level 10 times per second. The monitoring and control system calculates the collected oil volume ΔV_collected = S * ΔH based on the liquid level change ΔH (e.g., a rise of ΔH meters). Combining this with the total oil supply Q0 * time interval during this period, the oil recovery rate η is calculated in real time.

[0044] At the end of 180 seconds, the measurement and control system calculates the average oil recovery rate η_9000 at that speed point and plots the first data point on the graph;

[0045] Subsequently, the measurement and control system automatically increased the speed command to 10000 r / min. The system repeated the above measurement process and added a second data point (10000, η_10000) to the graph.

[0046] This process proceeds automatically until the rotational speed reaches 15,000 r / min. On the measurement and control system interface, a trend curve or fitted curve connecting each measuring point is generated in real time, clearly showing the pattern of oil recovery rate changing with increasing rotational speed.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An automatic testing system for oil recovery rate of high-speed bearings based on the volumetric method, characterized in that, Includes rotating shaft unit and oil recovery unit; The rotating shaft unit includes an oil baffle (1), a stop plate (2), a rotating shaft (3), an oil catch nut (4), a slip ring (5), a nozzle (6), a bearing (7), a bearing seat (8), a housing (9), and an oil collection sleeve (10). The oil collection sleeve (10), slip ring (5), stop plate (2), and oil catch nut (4) are mounted on the rotating shaft (3). The inner ring of the bearing (7) is fixed to the slip ring (5), and its outer ring is fixed to the bearing seat (8) by screws. The oil catch cover (11) and the oil baffle (1) are respectively mounted on the bearing seat (8). On the left and right end faces, the nozzle (6) is fixed on the right side of the bearing seat (8); after the lubricating oil enters the nozzle (6), it is sprayed into the oil collection nut (4) at a certain angle, and enters the bearing (7) through the stop plate (2) and slip ring (5); the lubricating oil that enters the bearing (7) overflows from the left and right sides of the bearing (7), the lubricating oil coming out from the left side directly enters the oil collection cover (11) on the left side, and the lubricating oil coming out from the right side is isolated by the oil baffle (1) and enters the oil collection cover (11) on the left side of the bearing (7) through the oil passage on the bearing seat (8); The oil collection unit includes an oil collection pipe (12), an oil pump (13), an oil collection container (14), and a liquid level sensor (15). The oil collection pipe (12) is connected to the oil collection cover (11) in the rotating shaft unit. The oil pump (13) is located in the middle of the oil collection pipe (12) and is connected to the oil collection pipe (12). The liquid level sensor (15) is placed inside the oil collection container (14) to precisely measure the change in liquid level in the oil collection container (14) and transmit the real-time liquid level signal to the automatic measurement and control system.

2. The automatic testing system for high-speed bearing oil recovery rate based on the volumetric method according to claim 1, characterized in that, The oil pump (13) is located in the middle of the oil receiving pipe (12) and is connected to the oil receiving pipe (12) to pump the extracted lubricating oil into the oil receiving container (14) with a known cross-sectional area.

3. The automatic testing system for high-speed bearing oil recovery rate based on the volumetric method according to claim 2, characterized in that, The oil collection container (14) is cylindrical, and the end of the oil collection pipe (12) that enters the oil collection container (14) is made into a bevel.

4. The automatic testing system for high-speed bearing oil recovery rate based on the volumetric method according to claim 3, characterized in that, The inner ring of the bearing (7) is interference-fitted with the shaft (3). The higher the rotational speed of the bearing (7), the more lubricating oil enters the bearing (7) through the slip ring (5).

5. The method of the automatic testing system for high-speed bearing oil recovery rate based on the volumetric method as described in any one of claims 1-4, characterized in that, Includes the following steps: S1: System initialization and parameter setting: Inject the initial reference oil volume into the oil receiving container (14), record the initial liquid level H0, and set the test load spectrum on the automatic test system: oil supply temperature T0, oil supply flow rate Q0, starting speed n_start, ending speed n_end, speed step Δn, and stable running time t_hold at each speed point; S2: Start the programmed test: The system controls the oil supply system to run at T0 and Q0, and accelerates the shaft system with bearing (7) to n_start; S3: Stable measurement: After the rotational speed reaches n_start, the system maintains this operating condition for t_hold time; during this period, the measurement and control system collects liquid level data, calculates the volume change ΔV_ based on the area of ​​the existing container, and continuously calculates the instantaneous and average oil recovery rate η at this rotational speed point in combination with the oil supply flow rate Q_. S4: Automatic working condition switching and continuous testing; when t_hold time is up, the spindle speed increases by one step Δn, and step S3 is repeated; this process is automatically cyclical until the speed reaches n_end; S5: Test Completion and Result Display: After the test, the test system automatically generates a complete characteristic curve of the oil recovery rate η changing with the rotational speed n, and stores and outputs the data.

6. The method of the automatic testing system for oil recovery rate of high-speed bearings based on the volumetric method according to claim 5, characterized in that, Oil collection volume Q' = (S*Δh) / t, where S is the cross-sectional area, Δh is the change in liquid level, and t is the running time; Oil collection rate η: η = (Q' / Q)*100%, where Q is the oil supply volume, i.e., oil collection volume / oil supply volume*100%.

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