CN2708292Y - Test bed for dynamic load performance of oil-retaining bearing - Google Patents

Abstract

The utility model discloses a test bench for testing the tribological performance of an oil bearing. It consists of a driving device, a loading device, and a test signal acquisition and control system. The utility model utilizes an eccentric wheel to generate a dynamic loading force and an ADAM4000 series intelligent module to realize signal detection and control. It is used to test the PV value, coefficient of sliding friction, and temperature rise tribological properties of oil-impregnated bearings under dynamic loading conditions. The test bench has the advantages of simple structure, low manufacturing cost, stable performance and high degree of intelligence.

Description

Oil-impregnated bearing dynamic load performance test bench

Technical field

The utility model relates to a test bed for dynamic load performance of an oil-impregnated bearing.

Background technique

Oil-impregnated bearings are made of metal powder and other anti-friction materials through pressing, sintering, shaping and oil immersion. The material is porous, can store lubricating oil, and has self-lubricating effect. It is often used in situations where it is inconvenient to add lubricating oil or cannot have lubricating oil leakage, such as food processing machines and textile machinery. It is also widely used in agricultural machinery, instruments and meters, and micro-motors. The annual output of my country's oil-impregnated bearings is measured in hundreds of millions. For the research and application of oil-impregnated bearings, in addition to the research on structure, technology, materials, etc., the performance evaluation method of oil-impregnated bearings is also a research topic worthy of attention. At present, there is no unified test method, evaluation standard and test bench for the tribological performance of oil-impregnated bearings in China.

Contents of the invention

The purpose of the utility model is to provide a test bed for dynamic load performance of an oil-impregnated bearing, which is used for testing the PV value, coefficient of sliding friction, and temperature-rise tribological properties of the oil-impregnated bearing under dynamic loading conditions.

In order to achieve the above object, the technical scheme that the utility model adopts is as follows:

An oil-impregnated bearing dynamic load performance test bench includes: a driving device, a loading device, and a test signal acquisition and control system; wherein:

1) Driving device: including two routes, one route is driven by a three-phase asynchronous motor through a pulley to rotate the main shaft of the headstock box. Installed in the loading sleeve; the other is that the output shaft of the DC gear motor is equipped with an eccentric wheel;

2) Loading device: a weight is hung on one end of the first lever, and the other end is in contact with the pulley. The support rod on the pulley is vertically fixedly connected with the ball linear guide, and one end of the ball linear guide is in contact with the eccentric wheel. The first lever There is a first loading knife edge in the middle, a second loading knife edge is installed under the first loading knife edge, the second loading knife edge is installed on the loading sleeve, and a second lever is installed under the loading sleeve, and the second lever is in contact with the load sensor; The sensor is inserted into the hole of the loading sleeve and is in contact with the outer surface of the oil-impregnated bearing;

3) Test signal acquisition and control system: the industrial computer is connected to the intelligent module ADAM4520 through the serial port, and the other end of the intelligent module ADAM4520 is respectively connected to the intelligent modules ADAM4050, ADAM4024, ADAM4019 through data lines; the intelligent modules ADAM4050, ADAM4024 are connected to the inverter The inverter is connected with the three-phase asynchronous motor; the other end of the intelligent module ADAM4019 is connected with the temperature sensor, the amplifier, and the inverter through the data line, and the amplifier is connected with the load sensor.

The beneficial effect of the utility model is that the dynamic loading force generated by the eccentric wheel and the ADAM4000 series intelligent modules are used to realize the detection and control of signals. It is used to test the PV value, coefficient of sliding friction, and temperature rise tribological properties of oil-impregnated bearings under dynamic loading conditions. The test bench has the advantages of simple structure, low manufacturing cost, stable performance and high degree of intelligence.

This oil-impregnated bearing dynamic load test bench is mainly suitable for the performance parameter test of small oil-impregnated bearings, and its technical parameters are as follows:

1) Oil bearing inner diameter: Φ8-20mm;

2) Oil bearing outer diameter: Φ12-40mm;

3) Oil bearing width: 8-40mm;

4) Speed adjustment range: 0-3000rpm;

5) Load range: 1.3-20kg;

6) Measuring temperature range: 0-150°C;

7) Measuring range of friction coefficient: 0.05-0.5.

Description of drawings

Figure 1 is a schematic diagram of the composition of the dynamic load test bench for oil-impregnated bearings;

Fig. 2 is a side view of the composition of the oil-impregnated bearing dynamic load test bench in Fig. 1;

Figure 3 is the data signal control and acquisition system of the test bench.

In the figure: 1-three-phase asynchronous motor, 2-headstock, 3-dual specimen shaft, 4-oil bearing, 5-loading sleeve, 6-load sensor, 7-lever, 8-temperature sensor, 9-weight , 10-eccentric wheel, 11,12-loading knife edge, 13-lever, 14-ball linear guide, 15-coupling, 16-DC geared motor.

specific implementation

As shown in Figure 1 and Figure 2, the three-phase asynchronous motor 1 provides a speed of 0-1500rpm, and transmits the speed to the main shaft of the headstock 2 through the V-belt (transmission ratio n ₁ /n ₂ = 2), the main shaft and the dual test Part shaft 3 is connected by fixed pin. The oil-impregnated bearing 4 cooperates with the dual test piece shaft 3 and is installed in the loading sleeve 5 . The friction force generated when the oil bearing moves is transmitted to the load sensor 6 through the lever 7; the change of temperature rise is measured by the temperature sensor 8. The dynamic load utilizes the leverage principle of the lever 13, and is transmitted to the loading sleeve 5 through the loading blades 11, 12, so as to realize the loading of the oil-impregnated bearing. The loading blade 11 acts on the middle of the lever 13, and the loading blades 11 and 12 are used to ensure the unidirectionality of force transmission, that is, to ensure that the load force acts radially on the oil bearing; one end of the lever 13 acts on the gravity of the weight 9 to keep the torque constant. change; the other end is a variable action point. The rotational speed generated by the DC deceleration motor 16, through the coupling 15, drives the eccentric wheel 10 to rotate, thereby driving the rolling linear guide rail 14 to move left and right, realizing the displacement of the variable action point on the lever 13, and generating a dynamic force on the loading knife edge 11. load capacity.

As shown in Figure 3, signal control and acquisition are realized through four ADAM4000 series intelligent modules and industrial computer. Use the T/C (thermocouple signal) port in the ADAM4019 general analog signal input module to collect the temperature signal of the temperature sensor 8 and the two V (volt level voltage) ports to collect the friction signal from the load sensor 6 and the signal from the load sensor 6 respectively. The speed signal of the inverter; the ADAM4024 analog signal output module controls the output of 4-20mA analog current to the inverter to control the output voltage frequency of the inverter, realizes the speed control of the three-phase asynchronous motor 1, and makes the motor output speed The range is 0 ~ 1500rpm; the ADAM4050 digital signal input and output module is used to control the start and stop of the motor. In the output channel, when the output digital signal is 1, the output voltage is 30V, the maximum output current is 30mA, the motor is powered on through the frequency converter, and the motor starts; when the output digital signal is 0, the output voltage is It is 0V, through the frequency converter, the power supply of the motor is cut off, and the motor is turned off. The industrial computer is FR-S520S-1.5K-CHR, the amplifier is YZ-C, and the load sensor is YZ201.

1. Measurement of PV value: Utilize the working principle of the first lever 13 and the eccentric wheel 10, and use the following formula to calculate and measure the PV value.

(1) Calculation of load force W:

$\mathrm{<span\; class="notranslate">\; W</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; e</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; cos</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;nt</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}{\mathrm{<span\; class="notranslate">\; l</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; e</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; cos</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}\mathrm{<span\; class="notranslate">\; \&pi;nt</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>}\mathrm{<span\; class="notranslate">\; G</span>}$

In the formula: l-the distance from the weight to the load knife edge (mm)

E-Eccentric distance of eccentric wheel (mm)

n- DC geared motor speed (rpm)

G-weight mass (g)

(2) Calculation of PV value:

$\mathrm{<span\; class="notranslate">\; PV</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; 9.8</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; W</span>}}{\mathrm{<span\; class="notranslate">\; d</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;dn</span>}}{\mathrm{<span\; class="notranslate">\; 60</span>}<span\; class="notranslate">\; \&times;</span>\mathrm{<span\; class="notranslate">\; 1000</span>}}$

$<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; 0.00053</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; wxya</span>}}{\mathrm{<span\; class="notranslate">\; B</span>}}$

In the formula:: d- test bearing inner diameter (mm)

                                     

B-Bearing width (mm)

P-specific pressure (N·mm ^-2 )

V-journal speed (m/s)

2. Measurement of friction coefficient: according to the value measured by the load sensor 6, the friction coefficient can be obtained through calculation.

Calculation of coefficient of friction:

$\mathrm{<span\; class="notranslate">\; \&mu;</span>}<span\; class="notranslate">\; =</span>\frac{\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; m</span>}}}{\mathrm{<span\; class="notranslate">\; wxya</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; FL</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; wxya</span>}}$

In the formula: M-average value of friction torque (N mm)

F - the pressure acting on the pressure sensor (g)

L-Lever 1 arm length (mm)

r-inner radius of test bearing (mm)

3. Measurement of temperature rise: directly measured by the temperature sensor 8 .

Claims (2)

1. an oiliness bearing dynamic load performance test stand is characterized in that comprising: drive unit, charger, test signal acquisition control system; Wherein:

1) drive unit: comprise two-way, one route threephase asynchronous (1) rotates by the main shaft that belt wheel drives main spindle box (2), antithesis test specimen axle (3) is housed on the main shaft of main spindle box (2), tested oiliness bearing (4) is contained on the antithesis test specimen axle (3), and oiliness bearing (4) is installed in and loads in the cover (5); Another road is on the output shaft of DC speed-reducing (16) eccentric wheel (10) to be housed;

2) charger: an end of first lever (13) hangs with counterweight (9), the other end contacts with pulley, cramp bar on the pulley and perpendicular the fixedlying connected of ball line slideway (13), one end of ball line slideway (13) contacts with eccentric wheel (10), be equipped with first in the middle of first lever (13) and load the edge of a knife (11), be equipped with second under the first loading edge of a knife (11) and load the edge of a knife (12), second loads the edge of a knife (12) is installed on the loading cover (5), below loading cover (5) second lever (7) is housed, second lever (7) contacts with load cell (6); Temperature sensor (8) inserts in the hole that loads cover (5), contacts with the outside surface of oiliness bearing (4);

3) test signal acquisition control system: industrial computer links by serial port and intelligent object ADAM4520, and the intelligent object ADAM4520 other end links by data line with intelligent object ADAM4050, ADAM4024, ADAM4019 respectively; Intelligent object ADAM4050, ADAM4024 and frequency converter link, and frequency converter links with threephase asynchronous (1) again; The intelligent object ADAM4019 other end by data line respectively with temperature sensor (8), amplifier, frequency converter links, amplifier is connected to load cell (6) again.

2. a kind of oiliness bearing tribological property according to claim 1 is test bed, it is characterized in that: industrial computer is FR-S520S-1.5K-CHR, and amplifier is YZ-C, and load cell is YZ201.