CN113029762A - Multifunctional rolling friction wear testing machine and control method thereof - Google Patents
Multifunctional rolling friction wear testing machine and control method thereof Download PDFInfo
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- CN113029762A CN113029762A CN202110459910.6A CN202110459910A CN113029762A CN 113029762 A CN113029762 A CN 113029762A CN 202110459910 A CN202110459910 A CN 202110459910A CN 113029762 A CN113029762 A CN 113029762A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
Abstract
The invention relates to a multifunctional rolling friction wear testing machine and a control method thereof, wherein the testing machine comprises a control system, a frame body, a lubricating bath, a first motor, a torque sensor, a rotating speed sensor, a first fixed shaft bracket, a first sample ring, a second motor, a speed reducer, a guide shaft, a first pressure plate, a second pressure plate, a spring, a push rod, a pressure sensor, a linear sliding guide rail, a second fixed shaft bracket, a second fixed shaft, a second sample ring, a thrust plate, a first connecting rod and a second connecting rod; the control method of the multifunctional rolling friction wear testing machine can realize human-computer interaction, the test can be more accurate and controllable through the human-computer interaction, and the reliability of the rolling friction wear test is greatly improved.
Description
Technical Field
The invention relates to an abrasion tester, in particular to a multifunctional rolling friction abrasion tester and a control method thereof.
Background
The phenomenon of friction is common in all industries and causes the failure of the machine mainly because of the wear of the dynamic coupling and the machine parts under the action of friction force, not the damage of the machine. Rolling friction is a common form of friction. Therefore, the research of the rolling friction and wear test has a guiding function for revealing the nature of the rolling friction and wear phenomenon, and understanding the influence of various factors on the rolling friction and wear phenomenon so as to determine the optimal use condition of the material. The rolling friction wear testing machine is a main carrier for carrying out a rolling friction wear test, and can simulate the actual working condition environment relatively closely. The research of the rolling friction abrasion tester has direct effect on understanding the adhesiveness, the wear resistance, the friction coefficient and the optimal working condition of the material. The lubricating oil has important functions on lubricating oil, new materials and coatings, and is an indispensable auxiliary tool for researchers.
The sample abrasion testing machine commonly used in the domestic laboratory mainly comprises an ML-10 pin disc type abrasive abrasion testing machine, an MM-200 type abrasion testing machine, an MLS-23 type wet sand rubber wheel abrasion testing machine, an MHK-500 type ring block type friction abrasion testing machine and the like. The testing machines are limited to friction and wear tests under the working condition of room temperature, are unstable in temperature, are easy to cause the phenomenon of overhigh local temperature, and are incomplete in lubrication. Equipment of working under extreme environment has special operating mode such as high temperature or microthermal, and current friction wear testing machine can't satisfy this special operating mode demand, can not carry out accurate control to the experimental condition moreover, and the experimental condition is single, can't carry out the experimental simulation of multiplex condition, can't carry out accurate control to moment of torsion, load, rotational speed, temperature, and can't accurately accomplish the rolling friction wear test under the variable speed condition, can't realize the mode of controlling of human-computer interaction.
Disclosure of Invention
In order to solve the technical problems, the invention provides a multifunctional rolling friction wear testing machine, which is characterized in that: the device comprises a control system, a frame body, a lubrication bath, a first motor, a torque sensor, a rotating speed sensor, a first fixed shaft bracket, a first sample ring, a second motor, a speed reducer, a guide shaft, a first pressure plate, a second pressure plate, a spring, a push rod, a pressure sensor, a linear sliding guide rail, a second fixed shaft bracket, a second fixed shaft, a second sample ring, a thrust plate, a first connecting rod and a second connecting rod;
the control system is arranged on the frame body; a lubricating bath is arranged at one end of the bottom plate of the frame body, a heater and a temperature sensor are arranged in the lubricating bath, and the heater and the temperature sensor are respectively connected with a control system through circuits;
the first motor is vertically arranged on the upper portion of the frame body, an output shaft of the first motor is vertically downwards connected with an input shaft of the torque sensor through a coupler, the rotating speed sensor is arranged on the input shaft of the torque sensor, the output shaft of the torque sensor is connected with the upper portion of the first fixed shaft through the coupler, the first fixed shaft is vertically supported on a first fixed shaft support through a bearing, the first fixed shaft support is fixed on the frame body, and the first sample ring is fixed on the lower portion of the first fixed shaft and located in the lubricating bath;
the second motor is horizontally arranged on the bottom plate of the frame body, the speed reducer is also arranged on the bottom plate of the frame body, an output shaft of the second motor is connected with an input shaft of the speed reducer through a coupler, an external thread is arranged on the output shaft of the speed reducer, a guide shaft is fixedly arranged on a speed reducer box body at the output end of the speed reducer, and the guide shaft and the output shaft of the speed reducer are arranged in parallel; the first pressure plate is provided with a threaded hole, and the first pressure plate is sleeved on an output shaft of the speed reducer through the threaded hole to form a screw rod structure; smooth through holes are respectively formed in the first pressure plate and the second pressure plate, the first pressure plate and the second pressure plate are sleeved on the guide shaft through the smooth through holes, and the first pressure plate and the second pressure plate can slide on the guide shaft; the opposite end surfaces of the first pressure plate and the second pressure plate are respectively provided with flange outlines, a spring is arranged between the first pressure plate and the second pressure plate, and two ends of the spring are respectively fixedly sleeved on the flange outlines of the first pressure plate and the second pressure plate; the push rod is arranged at the front end of the second pressure plate, and a pressure sensor is arranged at the front end of the push rod;
the linear sliding guide rail is horizontally fixed on the frame body and comprises a sliding block and a sliding rail, the sliding block is sleeved on the sliding rail, and one end of the second fixed shaft support is connected with the sliding block so as to realize linear motion in the horizontal direction; the second fixed shaft is vertically arranged on the second fixed shaft support through a bearing, the second sample ring is fixed at the lower part of the second fixed shaft, is positioned in the lubricating bath and is positioned at the same height with the first sample ring, so that the two sample rings can be accurately contacted on the same plane, and the load is stably and accurately applied; the one end fixedly connected with thrust plate of second fixed shaft support, be equipped with smooth through-hole on the thrust plate respectively, the one end of first connecting rod and second connecting rod is equipped with the end cap, the other end of first connecting rod and second connecting rod passes the smooth through-hole in both sides of thrust plate respectively and links firmly with the second pressure plate, the thrust plate can slide on first connecting rod and second connecting rod, first connecting rod and second connecting rod still play the effect of fixed transmission direction for the load can be exerted steadily, accurately.
The first motor, the torque sensor, the rotating speed sensor, the second motor and the pressure sensor are respectively connected with the control system through lines.
The bottom in the groove of the lubricating bath is of an inverted cone structure, the bottom is provided with a liquid outlet, the outer ring of the liquid outlet is provided with external threads, and the liquid outlet is in threaded connection with an oil plug screw; the heater is a heating coil which is coiled on the inner circumference of the lubricating bath.
The reducer is a single-stage worm and gear reducer and comprises a reducer box body, a worm and a worm gear, wherein a worm and a worm gear shaft of the worm gear are respectively pivoted in the reducer box body through bearings and are vertically arranged in a cross shape, the worm is meshed with the worm gear, the worm gear is arranged at the upper end of the worm, one end of the worm is an input shaft of the reducer, and one end of the worm gear shaft is an output shaft of the reducer; the output shaft of the second motor is connected with the worm through a coupler.
The front end of the push rod is provided with a threaded hole, the tail end of the pressure sensor is provided with an external thread, the push rod is in threaded connection with the pressure sensor, the tail end of the push rod is provided with an external thread, the center of the second pressure plate is provided with a threaded through hole, and the push rod is in threaded connection with the second pressure plate.
The central axes of the output shaft of the first motor, the input shaft and the output shaft of the torque sensor and the first fixed shaft are positioned on the same vertical line and are parallel to the central axes of the second fixed shaft and the second sample ring; the central axes of the output shaft of the speed reducer, the first pressure plate, the spring, the second pressure plate, the push rod, the pressure sensor and the thrust plate are positioned on the same horizontal line and are parallel to the central axes of the guide shaft, the first connecting rod and the second connecting rod and the slide rail of the linear sliding guide rail.
Preferably, the first motor is a servo motor, and the second motor is a three-phase asynchronous motor.
The working principle of the invention is as follows:
the control system comprises a central processing unit, a control panel with keys and a screen and the like, can receive and process data signals collected and transmitted by a temperature sensor, a rotating speed sensor, a torque sensor and a pressure sensor, and can control the rotating speed, the rotating direction and the rotating time of the first motor and the second motor.
The control system controls the first motor to rotate, an output shaft of the first motor transmits torque to the first fixed shaft through an input shaft and an output shaft of the torque sensor to drive the first fixed shaft to rotate in the first fixed shaft bracket, the first sample ring rotates along with the first fixed shaft, and meanwhile, the rotating speed sensor and the torque sensor measure the rotating speed and the torque output by the first motor to the first fixed shaft in real time;
the control system controls the second motor to rotate, the torque of an output shaft of the second motor is increased through the speed reduction of the speed reducer, the torque is output by the output shaft of the speed reducer, the output shaft of the speed reducer is provided with external threads, according to the principle of a screw rod, the rotation of the output shaft of the speed reducer can drive the first pressure plate to slide along the guide rod, different rotating directions of the second motor can drive the first pressure plate to slide to different directions, and the rotating direction and the rotating state of the second motor control the reciprocating motion and the starting and stopping of the linear motion of the first pressure plate; the second motor rotates forward to enable the first pressure plate to slide forwards to extrude the spring so as to push the second pressure plate to slide forwards, the push rod on the second pressure plate drives the pressure sensor to move forwards to extrude the thrust plate on the second fixed shaft support, and then the second fixed shaft is pushed to move forwards along the linear sliding guide rail so as to enable the second sample ring to extrude the first sample ring; the second motor rotates reversely to enable the first pressure plate to slide backwards to release the elastic force of the spring, and the thrust and the load of a push rod and a pressure sensor on the second pressure plate to the second fixed shaft support are reduced; when the second motor rotates reversely and returns to an initial state, the end caps at the front ends of the first connecting rod and the second connecting rod respectively generate motion interference with the two through holes of the thrust plate, the second pressure plate performs linear retreating motion along with the reverse rotation of the second motor, and the first connecting rod and the second connecting rod drive the thrust plate and the second fixed shaft bracket to linearly retreat through the end caps, so that the second sample ring is separated from the first sample ring; the pressure sensor measures the load value in real time.
Different lubricants can be added into the lubricating bath tank and are discharged through a liquid outlet at the bottom for replacement; the heater controls the temperature according to the instruction of the control system; the temperature sensor measures the temperature value in real time.
The invention provides a control method of a multifunctional rolling friction wear testing machine, which is characterized by comprising the following steps: the method comprises the following steps:
1) initializing, emptying data input by a control system, reversely rotating a second motor to reset a first pressure plate, not electrifying a heater for heating at the moment, and not rotating the first motor at the moment;
2) the temperature T, the rotating speed N, the torque T and the load N are subjected to data acquisition through a temperature sensor, a rotating speed sensor, a torque sensor and a pressure sensor and are transmitted to a control system;
3) the control system receives data from the temperature sensor, the rotating speed sensor, the torque sensor and the pressure sensor and displays the data on a screen of the control system;
4) inputting set values of temperature t, load N and radius r of a first sample ring through a key of a control system, wherein the set value of the radius r of the first sample ring is real data manually measured before a test;
5) judging whether a set value torque T is input or not; if the set value torque T is not input, entering the step 6); if the set value torque T is input, entering the step 7);
6) when the set value torque T is not input, inputting a set value rotating speed n, and entering the step 7);
7) the control system sends out an electric signal to control the temperature of the heater of the lubricating bath tank, and if the temperature sensor measures the current temperature t0If the temperature is equal to the input set temperature value t, the control system controls the heater to keep the current constant temperature effect; if the temperature sensor measures the current temperature t0If the temperature is lower than the set temperature value t, the control system controls the heater to heat up until the temperature in the lubricating bath tank reaches the temperature value t and then keeps constant temperature; if the temperature sensor measures the current temperature t0If the temperature is higher than the set temperature value t, the control system controls the heater to stop heating until the temperature in the lubricating bath tank is reduced to reach the temperature value t and then the temperature is kept constant;
8) the control system controls the second motor to operate and controls the steering and rotating time of the second motor, and if the pressure sensor measures the current load value N0When the load value is equal to the input set load value N, the second motor stops rotating, and the first pressure plate, the second pressure plate, the spring, the push rod and the pressure sensor keep the positions unchanged so as to keep the load value of the second sample ring unchanged; if the pressure sensor measures the current load value N0When the load value is lower than the set load value N, the second motor rotates forwards to transmit torque through the output shaft of the speed reducer, the first pressure plate slides forwards along the guide shaft according to the lead screw principle, the compression spring pushes the second pressure plate to slide forwards, the push rod and the pressure sensor tightly press the thrust plate to enable the second fixed shaft support to move forwards along the linear sliding guide rail, the second sample ring extrudes the first sample ring, and the second motor stops rotating when the load measured by the pressure sensor is equal to the set load value N; if the pressure sensor measures the current load value N0When the load value is higher than the set load value N, the second motor rotates reversely, the first pressure plate slides backwards along the guide shaft, the second pressure plate is pulled by the spring to slide backwards, the push rod and the pressure sensor reduce the extrusion on the push plate, and the second motor stops rotating when the load measured by the pressure sensor is equal to the set load value N;
9) judging whether a set value torque T is input or not; if the set value torque T is input, entering the step 10); if the set value torque T is not input, entering the step 11);
10) input deviceWhen the torque T is fixed, the control system sends an electric signal to control the torque of the first motor, and if the torque sensor measures the current torque value T0Equal to the inputted set torque value T, the first motor keeps the current torque value rotating, the input shaft and the output shaft of the torque sensor transmit the torque to the first fixed shaft, the first fixed shaft transmits the torque to the first sample ring, and the process proceeds to step 13); if the torque sensor measures the current torque value T0If the torque value is lower than the input set torque value T, the first motor increases the current torque value to rotate until the current torque value T is reached0Keeping the current torque value of the first motor rotating when the current torque value is equal to the set torque value T, and entering the step 13); if the torque sensor measures the current torque value T0If the torque value is higher than the input set torque value T, the first motor reduces the current torque value to rotate until the current torque value T is reached0Keeping the current torque value of the first motor rotating when the current torque value is equal to the set torque value T, and entering the step 13);
11) when the set value torque T is not input, whether the input set rotating speed n is a set value or a rotating speed range n is judgedmin～nmaxIf the input rotation speed n is a set value, entering step 12); if the input set rotating speed n is a rotating speed range nmin～nmaxStep 14) is entered;
12) when the input rotating speed n is a set value, the control system controls the rotating speed of the first motor, and if the rotating speed sensor detects the current rotating speed n0Equal to the input set rotating speed value n, the first motor keeps the current rotating speed value to rotate, and the step 13) is carried out; if the rotating speed sensor detects the current rotating speed value n0If the rotating speed is lower than the set rotating speed value n, the first motor accelerates to the current rotating speed value n0When the current rotating speed value is equal to the set rotating speed value n, the first motor keeps rotating at the current rotating speed value, and the step 13) is carried out; if the rotating speed sensor detects the current rotating speed value n0If the rotating speed is higher than the set rotating speed value n, the first motor decelerates to rotate to the current rotating speed value n0When the current rotating speed value is equal to the set rotating speed value n, the first motor keeps rotating at the current rotating speed value, and the step 13) is carried out;
13) the control system collects the measured current torque value T0Measured current load value N0And for transfusionThe radius r of the first sample ring is set and is calculated according to the formula
Calculating a rolling friction coefficient mu, and displaying a calculation result on a screen of a control system;
14) the input set rotating speed n is a rotating speed range nmin～nmaxWhen the motor is started, the control system controls the rotating speed of the first motor, and if the rotating speed sensor detects the current rotating speed value n0Is equal to the minimum value n of the input set rotating speed rangeminIf so, the first motor uniformly accelerates and rotates, and the step 15) is carried out; if the rotating speed sensor detects the current rotating speed value n0Lower than the minimum value n of the input set rotating speed rangeminThen the first motor rapidly accelerates to the current rotation speed value n0Equal to a set rotation speed value nminStarting uniform acceleration rotation of the first motor, and entering the step 15); if the rotating speed sensor detects the current rotating speed value n0Higher than the minimum value n of the set rotating speed rangeminThen the first motor rapidly decelerates to the current rotation speed value n0Equal to a set rotation speed value nminStarting uniform acceleration rotation of the first motor, and entering the step 15);
15) the control system controls the rotating speed of the first motor, and if the rotating speed sensor measures the current rotating speed value n1Equal to the maximum value n of the input set rotating speed rangemaxThe first motor stops rotating, and the first sample ring stops rotating; if the rotating speed sensor detects the current rotating speed value n1Below the maximum value n of the set speed rangemaxWhen the rotation speed of the first motor is higher than the preset rotation speed, the first motor continues to rotate at a constant speed until the rotation speed sensor measures the current rotation speed value n1Equal to the maximum value n of the set rotating speed rangemaxWhen the first motor stops rotating, the first sample ring stops rotating; the rotation speed sensor measures the current rotation speed value n1The maximum value of the set rotating speed range higher than the input is nmaxAnd (3) stopping the rotation of the first motor, sending an alarm prompt by the control system, displaying the alarm prompt on a screen, returning to the step 1), and carrying out the test again.
The invention has the beneficial effects that:
the multifunctional rolling friction wear testing machine provided by the invention can calculate the rolling friction coefficient, can observe the material wear condition after friction tests are carried out under different test conditions, can simulate various special working conditions and restore the real working conditions as far as possible, and can simulate various special working conditions by flexibly adjusting and changing the torque, the rotating speed, the load, the temperature and the lubricating conditions. Through the regulation of the rotating speed and the torque of the first motor, the working conditions of the sample at different rotating speeds and torques are completed, the working conditions of the sample at different loads are completed through the rotation of the second motor and the regulation of the rotating direction, the working conditions of the sample at different lubricating conditions and temperatures are completed through the replacement of a lubricating medium in the lubricating bath and the regulation of the temperature, the combined regulation of various testing conditions can be realized, the expected testing working conditions are completed through simulation, and the problems of the rolling friction wear test requirements of the existing rolling friction wear testing machine, such as single testing condition, incapability of simulating special working conditions, incapability of really reducing actual working conditions and the like are solved.
The control method of the multifunctional rolling friction wear testing machine provided by the invention can realize human-computer interaction, a tester can complete accurate control on test conditions by instruction input to the control system, the test condition data are monitored and fed back to the screen of the control system in real time through each sensor, the test can more accurately simulate the actual working condition, the rolling friction coefficient can be calculated by measuring the test data and the artificially input test data, when the test is abnormal, the device stops the test, and the control panel can send alarm information, the test can be more accurate and controllable through the human-computer interaction, the real-time observation can be carried out, and the reliability of the rolling friction wear test is greatly improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic front view of the present invention;
FIG. 3 is a schematic left side view of the present invention with a cross-sectional view through the center of the first stationary shaft;
FIG. 4 is a top view of the present invention and a schematic cross-sectional view through the center of the worm gear shaft;
FIG. 5 is a schematic cross-sectional view of a second friction pair of the present invention;
FIG. 6 is a schematic cross-sectional view of a worm gear reducer according to the present invention;
FIG. 7 is a flow chart of the control method of the present invention.
1. Control system 2, support body 3, lubrication bath 4, first motor 5, torque sensor
6. Rotation speed sensor 7, first fixed shaft 8, first fixed shaft holder 9, first sample ring
10. Second motor 11, speed reducer 12, guide shaft 13 and first pressure plate
14. Second pressure plate 15, spring 16, push rod 17 and pressure sensor
18. Linear sliding guide 19, second fixed shaft holder 20, and second fixed shaft
21. Second sample ring 22, thrust plate 23, first link 24, second link
25. Heater 26, temperature sensor 27, coupling 28, reduction gear box
29. Worm 30, worm wheel 31, worm wheel shaft 32, flange outline 33, slide block 34 and slide rail
35. Liquid outlet 36, button 37, screen 38, motor support 39, first guiding axle
40. A second guide shaft.
Detailed Description
Please refer to fig. 1-6:
the invention provides a multifunctional rolling friction wear testing machine, which comprises a control system 1, a frame body 2, a lubricating bath 3, a first motor 4, a torque sensor 5, a rotating speed sensor 6, a first fixed shaft 7, a first fixed shaft bracket 8, a first sample ring 9, a second motor 10, a speed reducer 11, a guide shaft 12, a first pressure plate 13, a second pressure plate 14, a spring 15, a push rod 16, a pressure sensor 17, a linear sliding guide rail 18, a second fixed shaft bracket 19, a second fixed shaft 20, a second sample ring 21, a thrust plate 22, a first connecting rod 23 and a second connecting rod 24, wherein the first motor is connected with the first fixed shaft bracket through a first connecting rod 13;
the control system 1 is arranged on the frame body 2; a lubricating bath 3 is arranged at one end of the bottom plate of the frame body 2, a heater 25 and a temperature sensor 26 are arranged in the lubricating bath 3, and the heater 25 and the temperature sensor 26 are respectively connected with the control system 1 through circuits;
the first motor 4 is a servo motor and is vertically arranged on the upper part of the frame body 2 through a motor support 38, an output shaft of the first motor 4 is vertically downwards connected with an input shaft of the torque sensor 5 through a coupler 27, the rotating speed sensor 6 is arranged on the input shaft of the torque sensor 5, a gear is arranged in the rotating speed sensor 6 and is arranged at the front end of the input shaft of the torque sensor 5, the gear in the rotating speed sensor 6 is driven to rotate through the rotation of the input shaft of the torque sensor 5, and then the rotating speed is measured; an output shaft of the torque sensor 5 is connected with the upper part of a first fixed shaft 7 through a coupler 27, the first fixed shaft 7 is vertically supported on a first fixed shaft support 8 through a deep groove ball bearing, the first fixed shaft support 8 is fixed on a frame body 2, a first sample ring 9 is sleeved on the lower part of the first fixed shaft 7 and is fixed through an elastic washer and a fastening nut, and the first sample ring 9 is positioned in a lubricating bath 3; the transmission ratios of the first motor 4, the torque sensor 5, the first fixed shaft 7 and the first sample ring 9 are all 1: 1.
The first fixed shaft 7, the first fixed shaft holder 8, and the first sample ring 9 constitute a first friction pair structure.
The second motor 10 is a three-phase asynchronous motor and is horizontally arranged on the bottom plate of the frame body 2 through a motor support 38, the speed reducer 11 is also arranged on the bottom plate of the frame body 2, the speed reducer 11 is a single-stage worm and gear speed reducer and comprises a speed reducer box body 28, a worm 29 and a worm gear 30, the worm 29 and a worm gear shaft 31 of the worm gear 30 are respectively pivoted in the speed reducer box body 28 through bearings and are vertically arranged in a cross shape, the worm 29 is meshed with the worm gear 30, the worm gear is arranged at the upper end of the worm, one end of the worm 29 is an input shaft of the speed reducer 11, and one end of the worm gear shaft 31 is; an output shaft of the second motor 10 is connected with an input shaft of the speed reducer 11, namely a worm 29, through a coupler 27, an output shaft of the speed reducer 11, namely a worm wheel shaft 31, is provided with external threads, a speed reducer box 28 at the output end of the speed reducer 11 is fixedly provided with a guide shaft 12, the guide shaft 12 comprises a first guide shaft 39 and a second guide shaft 40, the first guide shaft 39 and the second guide shaft 40 are respectively arranged at the left side and the right side of the output shaft of the speed reducer 11, are arranged in parallel with the output shaft of the speed reducer 11 and are connected with the speed reducer box 28 through threads, and shaft shoulders are arranged at the joints of the first guide shaft 39 and the second guide shaft 40 with the speed reducer box 28 to limit the first pressure plate 13; the first pressure plate 13 is provided with a threaded hole, and the first pressure plate 13 is sleeved on an output shaft with external threads of the speed reducer 11 through the threaded hole to form a screw rod structure; the first pressure plate 13 and the second pressure plate 14 are also respectively provided with smooth through holes on the left side and the right side by taking the threaded hole as the center, the first pressure plate 13 and the second pressure plate 14 are sleeved on the first guide shaft 39 and the second guide shaft 40 through the smooth through holes, and the first pressure plate 13 and the second pressure plate 14 can slide on the first guide shaft 39 and the second guide shaft 40; the opposite end surfaces of the first pressure plate 13 and the second pressure plate 14 are respectively provided with a flange outline 32, a spring 15 is arranged between the first pressure plate 13 and the second pressure plate 14, and two ends of the spring 15 are respectively fixedly sleeved on the flange outlines 32 of the first pressure plate 13 and the second pressure plate 14; the push rod 16 is arranged at the front end of the second pressure plate 14, a threaded hole is formed in the front end of the push rod 16, external threads are formed in the tail end of the pressure sensor 17, the push rod 16 is in threaded connection with the pressure sensor 17, external threads are formed in the tail end of the push rod 16, a threaded through hole is formed in the center of the second pressure plate 14, and the push rod 16 is in threaded connection with the second pressure plate 14.
The linear sliding guide rail 18 is horizontally fixed on the frame body 2, the linear sliding guide rail 18 comprises a sliding block 33 and a sliding rail 34, the sliding block 33 is sleeved on the sliding rail 34, and one end of the second fixed shaft bracket 19 is connected with the sliding block 33 so as to realize linear motion in the horizontal direction; the second fixed shaft 20 is vertically arranged on the second fixed shaft bracket 19 through a deep groove ball bearing, the second sample ring 21 is fixed at the lower part of the second fixed shaft 20, is positioned in the lubricating bath 3 and is positioned at the same height with the first sample ring 9, so that the two sample rings can be accurately contacted on the same plane, and the load is stably and accurately applied; one end fixedly connected with thrust plate 22 of second fixed axle support 19, be equipped with smooth through-hole on the both sides respectively about thrust plate 22, the one end of first connecting rod 23 and second connecting rod 24 is equipped with the end cap, the other end of first connecting rod 23 and second connecting rod 24 passes the smooth through-hole in both sides of thrust plate 22 respectively and links firmly with second pressure plate 14, thrust plate 22 can slide on first connecting rod 23 and second connecting rod 24, first connecting rod 23 and second connecting rod 24 still play the effect of fixed transmission direction, make the load can be exerted steadily, accurately. The second fixed shaft holder 19, the second fixed shaft 20, and the second sample ring 21 constitute a second friction pair.
The first motor 4, the torque sensor 5, the rotating speed sensor 6, the second motor 10 and the pressure sensor 17 are respectively connected with the control system 1 through lines.
The bottom in the lubricating bath 3 is of an inverted cone structure, the bottom is provided with a liquid outlet 35, the outer ring of the liquid outlet 35 is provided with external threads, and the liquid outlet 35 is in threaded connection with an oil plug screw; the heater 25 is a heating coil which is coiled around the inner circumference of the lubricating bath 3.
The central axes of the output shaft of the first motor 4, the input shaft and the output shaft of the torque sensor 5, and the first stationary shaft 7 are located on the same vertical line and parallel to the central axes of the second stationary shaft 20 and the second sample ring 21; the central axes of the output shaft of the reducer 11, the first pressure plate 13, the spring 15, the second pressure plate 14, the push rod 16, the pressure sensor 17, and the thrust plate 22 are located on the same horizontal line, and are parallel to the central axes of the guide shaft 12, the first link 23, and the second link 24, and the slide rail 34 of the linear slide rail 18.
The working principle of the invention is as follows:
the control system 1 comprises a central processing unit, a control panel with keys 36 and a screen 37, and the like, can receive and process data signals collected and transmitted by the temperature sensor 26, the rotating speed sensor 6, the torque sensor 5 and the pressure sensor 17, and can control the rotating speed, the rotating direction and the rotating time of the first motor 4 and the second motor 10.
The control system 1 controls the first motor 4 to rotate, an output shaft of the first motor 4 transmits torque to the first fixed shaft 7 through an input shaft and an output shaft of the torque sensor 5, the first fixed shaft 7 is driven to rotate in the first fixed shaft bracket 8, the first sample ring 9 rotates along with the first fixed shaft, and meanwhile the rotating speed sensor 6 and the torque sensor 5 measure the rotating speed and the torque output by the first motor 4 to the first fixed shaft 7 in real time;
the control system 1 controls the second motor 10 to rotate, the torque of an output shaft of the second motor 10 is output by an output shaft of the speed reducer 11 through speed reduction and torque increase of the speed reducer 11, the output shaft of the speed reducer 11 is provided with external threads, according to a lead screw principle, the rotation of the output shaft of the speed reducer 11 can drive the first pressure plate 13 to slide along a guide rod, different rotation directions of the second motor 10 can drive the first pressure plate 13 to slide to different directions, and the rotation direction and the rotation state of the second motor 10 control the reciprocating motion and the start and stop of the linear motion of the first pressure plate 13; the second motor 10 rotates forward to make the first pressure plate 13 slide forward to press the spring 15 and further push the second pressure plate 14 to slide forward, the push rod 16 on the second pressure plate 14 drives the pressure sensor 17 to move forward to press the thrust plate 22 on the second fixed shaft bracket 19, and further push the second fixed shaft bracket 19 to move forward along the linear sliding guide rail 18, so that the second sample ring 21 presses the first sample ring 9; the second motor 10 rotates reversely to make the first pressure plate 13 slide backwards to release the elasticity of the spring 15, and reduce the thrust and load of the push rod 16 and the pressure sensor 17 on the second pressure plate 14 to the second fixed shaft bracket 19; when the second motor 10 rotates reversely and returns to an initial state, the end caps at the front ends of the first connecting rod 23 and the second connecting rod 24 respectively generate motion interference with two through holes of the thrust plate 22, the second pressure plate 14 moves linearly backward along with the reverse rotation of the second motor 10, the first connecting rod 23 and the second connecting rod 24 drive the thrust plate 22 and the second fixed shaft bracket 19 to linearly backward through the end caps, and thus the second sample ring 21 is separated from the first sample ring 9; the pressure sensor 17 measures the load value in real time.
Different lubricants can be added into the lubricating bath 3 and are discharged through a liquid outlet 35 at the bottom for replacement; the heater 25 performs temperature control according to an instruction of the control system 1; the temperature sensor 26 measures the temperature value in real time.
Please refer to fig. 7:
the invention provides a control method of a multifunctional rolling friction wear testing machine, which is characterized by comprising the following steps: the method comprises the following steps:
1) initializing, clearing the input data of the control system 1, reversely rotating the second motor 10 to reset the first pressure plate 13, not electrifying the heater 25 for heating at the moment, and not rotating the first motor 4 at the moment;
2) the temperature T, the rotating speed N, the torque T and the load N are subjected to data acquisition through a temperature sensor 26, a rotating speed sensor 6, a torque sensor 5 and a pressure sensor 17 and are transmitted to the control system 1;
3) the control system 1 receives data from the temperature sensor 26, the rotating speed sensor 6, the torque sensor 5 and the pressure sensor 17 and displays the data on a screen 37 of the control system 1;
4) inputting set values of temperature t, load N and radius r of the first sample ring 9 through a key 36 of the control system 1, wherein the set value of the radius r of the first sample ring 9 is real data manually measured before a test;
5) judging whether a set value torque T is input or not; if the set value torque T is not input, entering the step 6); if the set value torque T is input, entering the step 7);
6) when the set value torque T is not input, inputting a set value rotating speed n, and entering the step 7);
7) the control system 1 sends out an electric signal to control the temperature of the heater 25 of the lubricating bath 3, if the temperature sensor 26 detects the current temperature t0If the temperature is equal to the input set temperature value t, the control system 1 controls the heater 25 to keep the current constant temperature effect; if the temperature sensor 26 measures the current temperature t0If the temperature is lower than the set temperature value t, the control system 1 controls the heater 25 to heat up to the temperature t in the lubricating bath 3 and then keeps constant temperature; if the temperature sensor 26 measures the current temperature t0If the temperature is higher than the set temperature value t, the control system 1 controls the heater 25 to stop heating until the temperature in the lubricating bath 3 is reduced to reach the temperature value t, and then the temperature is kept constant;
8) the control system 1 controls the second motor 10 to operate and controls the steering and rotating time of the second motor 10, if the pressure sensor 17 detects the current load value N0When the load value is equal to the input set load value N, the second motor 10 stops rotating, and the first pressure plate 13, the second pressure plate 14, the spring 15, the push rod 16 and the pressure sensor 17 keep the positions unchanged, so that the load value of the second sample ring 21 is kept unchanged; if the pressure sensor 17 measuresObtaining the current load value N0When the load value is lower than the set load value N, the second motor 10 rotates forwards to transmit torque through the output shaft of the speed reducer 11, the first pressure plate 13 slides forwards along the guide shaft 12 according to the lead screw principle, the compression spring 15 pushes the second pressure plate 14 to slide forwards, and then the push rod 16 and the pressure sensor 17 press the thrust plate 22 to enable the second fixed shaft bracket 19 to move forwards along the linear sliding guide rail 18, the second sample ring 21 presses the first sample ring 9, and the second motor 10 stops rotating when the load measured by the pressure sensor 17 is equal to the set load value N; if the pressure sensor 17 measures the current load value N0When the load value is higher than the set load value N, the second motor 10 rotates reversely, the first pressure plate 13 slides backwards along the guide shaft 12, the second pressure plate 14 is pulled by the spring 15 to slide backwards, the push rod 16 and the pressure sensor 17 reduce the extrusion on the thrust plate 22, and the second motor 10 stops rotating when the load measured by the pressure sensor 17 is equal to the set load value N;
9) judging whether a set value torque T is input or not; if the set value torque T is input, entering the step 10); if the set value torque T is not input, entering the step 11);
10) when a set value torque T is input, the control system 1 sends an electric signal to control the torque of the first motor 4, and if the torque sensor 5 detects the current torque value T0Equal to the inputted set torque value T, the first motor 4 keeps the current torque value rotating, the input shaft and the output shaft of the torque sensor 5 transmit the torque to the first stationary shaft 7, the first stationary shaft 7 transmits the torque to the first sample ring 9, and the process proceeds to step 13); if the torque sensor 5 measures the current torque value T0If the torque value is lower than the input set torque value T, the first motor 4 increases the current torque value to rotate to the current torque value T0The first motor 4 keeps the current torque value rotating when the set torque value T is equal to the set torque value T, and proceeds to step 13); if the torque sensor 5 measures the current torque value T0If the torque value is higher than the input set torque value T, the first motor 4 reduces the current torque value to rotate to the current torque value T0The first motor 4 keeps the current torque value rotating when the set torque value T is equal to the set torque value T, and proceeds to step 13);
11) when the set value torque T is not input, whether the input set rotating speed n is a set value or one is judgedSpeed range nmin～nmaxIf the input rotation speed n is a set value, entering step 12); if the input set rotating speed n is a rotating speed range nmin～nmaxStep 14) is entered;
12) when the input rotation speed n is a set value, the control system 1 controls the rotation speed of the first motor 4, and if the rotation speed sensor 6 detects the current rotation speed n0Equal to the input set rotation speed value n, the first motor 4 keeps the current rotation speed value rotating, and step 13) is entered; if the rotating speed sensor 6 detects the current rotating speed value n0If the rotation speed is lower than the set rotation speed n, the first motor 4 is accelerated to the current rotation speed n0When the current rotating speed value is equal to the set rotating speed value n, the first motor 4 keeps rotating at the current rotating speed value, and the step 13) is carried out; if the rotating speed sensor 6 detects the current rotating speed value n0If the rotating speed is higher than the set rotating speed value n, the first motor 4 rotates at a reduced speed to the current rotating speed value n0When the current rotating speed value is equal to the set rotating speed value n, the first motor 4 keeps rotating at the current rotating speed value, and the step 13) is carried out;
13) the control system 1 collects the measured current torque value T0Measured current load value N0The radius r of the first sample ring 9 is input and passes through the formula
Calculating the rolling friction coefficient μ, and displaying the calculation result on the screen 37 of the control system 1;
14) the input set rotating speed n is a rotating speed range nmin～nmaxWhen the rotation speed sensor 6 detects the current rotation speed value n, the control system 1 controls the rotation speed of the first motor 40Is equal to the minimum value n of the input set rotating speed rangeminIf so, the first motor 4 uniformly accelerates and rotates, and the step 15) is carried out; if the rotating speed sensor 6 detects the current rotating speed value n0Lower than the minimum value n of the input set rotating speed rangeminThen the first motor 4 is rapidly accelerated to the current rotation speed value n0Equal to a set rotation speed value nminStarting the uniform acceleration rotation of the first motor 4, and proceeding to step 15); if the rotating speed sensor 6 detects the current rotating speed value n0Minimum higher than set rotation speed rangeValue nminThen the first motor 4 is rapidly decelerated to the current rotation speed value n0Equal to a set rotation speed value nminStarting the uniform acceleration rotation of the first motor 4, and proceeding to step 15); .
15) The control system 1 controls the rotation speed of the first motor 4, and if the rotation speed sensor 6 detects the current rotation speed value n1Equal to the maximum value n of the input set rotating speed rangemaxThe first motor 4 stops rotating, and the first sample ring 9 stops rotating; if the rotating speed sensor 6 detects the current rotating speed value n1Below the maximum value n of the set speed rangemaxWhen the rotation speed of the first motor 4 is measured by the rotation speed sensor 6, the first motor continues to rotate at a uniform acceleration speed until the current rotation speed value n is measured by the first motor 41Equal to the maximum value n of the set rotating speed rangemaxWhen the first motor 4 stops rotating, the first sample ring 9 stops rotating; the rotating speed sensor 6 measures the current rotating speed value n1The maximum value of the set rotating speed range higher than the input is nmaxAnd when the first motor 4 stops rotating, the control system 1 gives an alarm prompt and displays the alarm prompt on the screen 37, and returns to the step 1) to perform the test again. The wear of the pattern is observed in real time throughout the process.
Claims (8)
1. The utility model provides a multi-functional rolling friction wear test machine which characterized in that: the device comprises a control system, a frame body, a lubrication bath, a first motor, a torque sensor, a rotating speed sensor, a first fixed shaft bracket, a first sample ring, a second motor, a speed reducer, a guide shaft, a first pressure plate, a second pressure plate, a spring, a push rod, a pressure sensor, a linear sliding guide rail, a second fixed shaft bracket, a second fixed shaft, a second sample ring, a thrust plate, a first connecting rod and a second connecting rod;
the control system is arranged on the frame body; a lubricating bath is arranged at one end of the bottom plate of the frame body, a heater and a temperature sensor are arranged in the lubricating bath, and the heater and the temperature sensor are respectively connected with a control system through circuits;
the first motor is vertically arranged on the upper portion of the frame body, an output shaft of the first motor is vertically downwards connected with an input shaft of the torque sensor through a coupler, the rotating speed sensor is arranged on the input shaft of the torque sensor, the output shaft of the torque sensor is connected with the upper portion of the first fixed shaft through the coupler, the first fixed shaft is vertically supported on a first fixed shaft support through a bearing, the first fixed shaft support is fixed on the frame body, and the first sample ring is fixed on the lower portion of the first fixed shaft and located in the lubricating bath;
the second motor is horizontally arranged on the bottom plate of the frame body, the speed reducer is also arranged on the bottom plate of the frame body, an output shaft of the second motor is connected with an input shaft of the speed reducer through a coupler, an external thread is arranged on the output shaft of the speed reducer, a guide shaft is fixedly arranged on a speed reducer box body at the output end of the speed reducer, and the guide shaft and the output shaft of the speed reducer are arranged in parallel; the first pressure plate is provided with a threaded hole, and the first pressure plate is sleeved on an output shaft of the speed reducer through the threaded hole to form a screw rod structure; smooth through holes are respectively formed in the first pressure plate and the second pressure plate, the first pressure plate and the second pressure plate are sleeved on the guide shaft through the smooth through holes, and the first pressure plate and the second pressure plate can slide on the guide shaft; the opposite end surfaces of the first pressure plate and the second pressure plate are respectively provided with flange outlines, a spring is arranged between the first pressure plate and the second pressure plate, and two ends of the spring are respectively fixedly sleeved on the flange outlines of the first pressure plate and the second pressure plate; the push rod is arranged at the front end of the second pressure plate, and a pressure sensor is arranged at the front end of the push rod;
the linear sliding guide rail is horizontally fixed on the frame body and comprises a sliding block and a sliding rail, the sliding block is sleeved on the sliding rail, and one end of the second fixed shaft support is connected with the sliding block; the second fixed shaft is vertically arranged on a second fixed shaft support through a bearing, and the second sample ring is fixed at the lower part of the second fixed shaft, is positioned in the lubricating bath and is positioned at the same height as the first sample ring; one end of the second fixed shaft support is fixedly connected with a thrust plate, smooth through holes are respectively formed in the thrust plate, end caps are arranged at one ends of the first connecting rod and the second connecting rod, the other ends of the first connecting rod and the second connecting rod respectively penetrate through the smooth through holes in the two sides of the thrust plate and are fixedly connected with a second pressure plate, and the thrust plate can slide on the first connecting rod and the second connecting rod;
the first motor, the torque sensor, the rotating speed sensor, the second motor and the pressure sensor are respectively connected with the control system through lines.
2. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the bottom in the groove of the lubricating bath is of an inverted cone structure, the bottom is provided with a liquid outlet, the outer ring of the liquid outlet is provided with external threads, and the liquid outlet is in threaded connection with an oil plug screw; the heater is a heating coil which is coiled on the inner circumference of the lubricating bath.
3. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the reducer is a single-stage worm and gear reducer and comprises a reducer box body, a worm and a worm gear, wherein a worm and a worm gear shaft of the worm gear are respectively pivoted in the reducer box body through bearings and are vertically arranged in a cross shape, the worm is meshed with the worm gear, the worm gear is arranged at the upper end of the worm, one end of the worm is an input shaft of the reducer, and one end of the worm gear shaft is an output shaft of the reducer; the output shaft of the second motor is connected with the worm through a coupler.
4. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the front end of the push rod is provided with a threaded hole, the tail end of the pressure sensor is provided with an external thread, the push rod is in threaded connection with the pressure sensor, the tail end of the push rod is provided with an external thread, the center of the second pressure plate is provided with a threaded through hole, and the push rod is in threaded connection with the second pressure plate.
5. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the central axes of the output shaft of the first motor, the input shaft and the output shaft of the torque sensor and the first fixed shaft are positioned on the same vertical line and are parallel to the central axes of the second fixed shaft and the second sample ring; the central axes of the output shaft of the speed reducer, the first pressure plate, the spring, the second pressure plate, the push rod, the pressure sensor and the thrust plate are positioned on the same horizontal line and are parallel to the central axes of the guide shaft, the first connecting rod and the second connecting rod and the slide rail of the linear sliding guide rail.
6. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the guide shaft comprises a first guide shaft and a second guide shaft, the first guide shaft and the second guide shaft are arranged in parallel and are in threaded connection with the reduction box body, and a shaft shoulder is arranged at the joint of the first guide shaft and the second guide shaft and the reduction box body to limit the first pressure plate.
7. The multifunctional rolling friction abrasion tester according to claim 1, characterized in that: the first motor is a servo motor, and the second motor is a three-phase asynchronous motor.
8. The control method of the multifunctional rolling friction wear tester according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
1) initializing, emptying data input by a control system, reversely rotating a second motor to reset a first pressure plate, not electrifying a heater for heating at the moment, and not rotating the first motor at the moment;
2) the temperature T, the rotating speed N, the torque T and the load N are subjected to data acquisition through a temperature sensor, a rotating speed sensor, a torque sensor and a pressure sensor and are transmitted to a control system;
3) the control system receives data from the temperature sensor, the rotating speed sensor, the torque sensor and the pressure sensor and displays the data on a screen of the control system;
4) inputting set values of temperature t, load N and radius r of a first sample ring through a key of a control system, wherein the set value of the radius r of the first sample ring is real data manually measured before a test;
5) judging whether a set value torque T is input or not; if the set value torque T is not input, entering the step 6); if the set value torque T is input, entering the step 7);
6) when the set value torque T is not input, inputting a set value rotating speed n, and entering the step 7);
7) the control system sends out an electric signal to control the temperature of the heater of the lubricating bath tank, and if the temperature sensor measures the current temperature t0If the temperature is equal to the input set temperature value t, the control system controls the heater to keep the current constant temperature effect; if the temperature sensor measures the current temperature t0If the temperature is lower than the set temperature value t, the control system controls the heater to heat up until the temperature in the lubricating bath tank reaches the temperature value t and then keeps constant temperature; if the temperature sensor measures the current temperature t0If the temperature is higher than the set temperature value t, the control system controls the heater to stop heating until the temperature in the lubricating bath tank is reduced to reach the temperature value t and then the temperature is kept constant;
8) the control system controls the second motor to operate and controls the steering and rotating time of the second motor, and if the pressure sensor measures the current load value N0When the load value is equal to the input set load value N, the second motor stops rotating, and the first pressure plate, the second pressure plate, the spring, the push rod and the pressure sensor keep the positions unchanged so as to keep the load value of the second sample ring unchanged; if the pressure sensor measures the current load value N0When the load value is lower than the set load value N, the second motor rotates forwards to transmit torque through the output shaft of the speed reducer, the first pressure plate slides forwards along the guide shaft according to the lead screw principle, the compression spring pushes the second pressure plate to slide forwards, the push rod and the pressure sensor tightly press the thrust plate to enable the second fixed shaft support to move forwards along the linear sliding guide rail, the second sample ring extrudes the first sample ring, and the second motor stops rotating when the load measured by the pressure sensor is equal to the set load value N; if the pressure sensor measures the current load value N0When the load value is higher than the set load value N, the second motor rotates reversely, the first pressure plate slides backwards along the guide shaft, the second pressure plate is pulled by the spring to slide backwards, the push rod and the pressure sensor reduce the extrusion on the push plate, and the second motor stops rotating when the load measured by the pressure sensor is equal to the set load value N;
9) judging whether a set value torque T is input or not; if the set value torque T is input, entering the step 10); if the set value torque T is not input, entering the step 11);
10) when a set value torque T is inputThe control system sends out an electric signal to control the torque of the first motor, and if the torque sensor measures the current torque value T0Equal to the inputted set torque value T, the first motor keeps the current torque value rotating, the input shaft and the output shaft of the torque sensor transmit the torque to the first fixed shaft, the first fixed shaft transmits the torque to the first sample ring, and the process proceeds to step 13); if the torque sensor measures the current torque value T0If the torque value is lower than the input set torque value T, the first motor increases the current torque value to rotate until the current torque value T is reached0Keeping the current torque value of the first motor rotating when the current torque value is equal to the set torque value T, and entering the step 13); if the torque sensor measures the current torque value T0If the torque value is higher than the input set torque value T, the first motor reduces the current torque value to rotate until the current torque value T is reached0Keeping the current torque value of the first motor rotating when the current torque value is equal to the set torque value T, and entering the step 13);
11) when the set value torque T is not input, whether the input set rotating speed n is a set value or a rotating speed range n is judgedmin～nmaxIf the input rotation speed n is a set value, entering step 12); if the input set rotating speed n is a rotating speed range nmin～nmaxStep 14) is entered;
12) when the input rotating speed n is a set value, the control system controls the rotating speed of the first motor, and if the rotating speed sensor detects the current rotating speed n0Equal to the input set rotating speed value n, the first motor keeps the current rotating speed value to rotate, and the step 13) is carried out; if the rotating speed sensor detects the current rotating speed value n0If the rotating speed is lower than the set rotating speed value n, the first motor accelerates to the current rotating speed value n0When the current rotating speed value is equal to the set rotating speed value n, the first motor keeps rotating at the current rotating speed value, and the step 13) is carried out; if the rotating speed sensor detects the current rotating speed value n0If the rotating speed is higher than the set rotating speed value n, the first motor decelerates to rotate to the current rotating speed value n0When the current rotating speed value is equal to the set rotating speed value n, the first motor keeps rotating at the current rotating speed value, and the step 13) is carried out;
13) the control system collects the measured current torque value T0Measured current load value N0First sample ring of inputSet value of radius r, and by formula
Calculating a rolling friction coefficient mu, and displaying a calculation result on a screen of a control system;
14) the input set rotating speed n is a rotating speed range nmin～nmaxWhen the motor is started, the control system controls the rotating speed of the first motor, and if the rotating speed sensor detects the current rotating speed value n0Is equal to the minimum value n of the input set rotating speed rangeminIf so, the first motor uniformly accelerates and rotates, and the step 15) is carried out; if the rotating speed sensor detects the current rotating speed value n0Lower than the minimum value n of the input set rotating speed rangeminThen the first motor rapidly accelerates to the current rotation speed value n0Equal to a set rotation speed value nminStarting uniform acceleration rotation of the first motor, and entering the step 15); if the rotating speed sensor detects the current rotating speed value n0Higher than the minimum value n of the set rotating speed rangeminThen the first motor rapidly decelerates to the current rotation speed value n0Equal to a set rotation speed value nminStarting uniform acceleration rotation of the first motor, and entering the step 15);
15) the control system controls the rotating speed of the first motor, and if the rotating speed sensor measures the current rotating speed value n1Equal to the maximum value n of the input set rotating speed rangemaxThe first motor stops rotating, and the first sample ring stops rotating; if the rotating speed sensor detects the current rotating speed value n1Below the maximum value n of the set speed rangemaxWhen the rotation speed of the first motor is higher than the preset rotation speed, the first motor continues to rotate at a constant speed until the rotation speed sensor measures the current rotation speed value n1Equal to the maximum value n of the set rotating speed rangemaxWhen the first motor stops rotating, the first sample ring stops rotating; the rotation speed sensor measures the current rotation speed value n1The maximum value of the set rotating speed range higher than the input is nmaxAnd (3) stopping the rotation of the first motor, sending an alarm prompt by the control system, displaying the alarm prompt on a screen, returning to the step 1), and carrying out the test again.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113504176A (en) * | 2021-09-08 | 2021-10-15 | 江苏摩信工业系统有限公司 | Tester for controlling thread friction coefficient |
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