CN107433521B - Performance test platform of high-speed precise roller grinding head - Google Patents
Performance test platform of high-speed precise roller grinding head Download PDFInfo
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- CN107433521B CN107433521B CN201710667047.7A CN201710667047A CN107433521B CN 107433521 B CN107433521 B CN 107433521B CN 201710667047 A CN201710667047 A CN 201710667047A CN 107433521 B CN107433521 B CN 107433521B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/08—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving liquid or pneumatic means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
The invention discloses a performance test platform of a high-speed precision roller grinding head, which at least comprises the following parts: the device comprises a high-speed precision roller grinding head base part, a loading part, a hydraulic system and a control system; the front end of the grinding head is provided with a cylindrical roller bearing, the tail end of a hydraulic rod is provided with a shifting fork (9) in the loading part, the loading force of the loading part comes from a hydraulic loading system, and the hydraulic loading system realizes loading on a test platform through the contact of the shifting fork (9) and the outer ring of the cylindrical roller bearing (19).
Description
Technical Field
The invention relates to the technical field of machinery, in particular to a performance test platform of a high-speed precision roller grinding head.
Background
Generally, grinding is divided into normal grinding (v < 45 m/s), high-speed grinding (45 m/s is less than or equal to v <150 m/s) and ultra-high-speed grinding (v is more than or equal to 150 m/s) according to the linear speed v of the grinding wheel. As is known, high-speed grinding and ultrahigh-speed grinding can not only greatly improve the grinding efficiency, but also obviously improve the grinding processing quality. High-speed and ultrahigh-speed grinding technology is particularly important in developed countries such as Germany, japan and America, and the roll grinding machine with the grinding wheel linear velocity of more than 80m/s is widely applied to the industrial production of the countries, and some of the grinding machines even reach 200m/s; compared with the high-speed grinding technology in developed countries, the research on the aspect of high-speed grinding in China is started late, the technology is not mature, and the practical application of engineering is not completely solved. At present, the most prominent difference between domestic and foreign roll grinders is shown in the following: at present, most of the grinding wheel linear velocities of domestic roller grinders are only about 45m/s, and the grinding efficiency and the grinding quality of the roller grinders cannot be compared with those of the roller grinders which are widely used for industrial production at abroad and have the grinding wheel linear velocities of more than 80 m/s. In recent years, with the continuous influx of foreign high-speed roll grinders of 80m/s and above into the market of China, the common roll grinders of 45m/s made in China face a serious challenge, and meanwhile, the demand for the high-speed roll grinders of 80m/s made in China is increasing.
The linear speed of a grinding wheel of the current domestic roller grinder is increased to 80m/s from 45m/s, the linear speed is not a simple linear speed increase problem, the technical problems to be solved are many, and a domestic high-speed precise roller grinding head is not developed at present in China, namely a series of core technical problems caused by the increase of the linear speed of the grinding wheel are not solved. In order to increase the linear speed of the grinding wheel from the ordinary roller grinding level of 45m/s to the high-speed roller grinding level of 80m/s, the change of the structural performance, the thermal characteristic, the dynamic performance and the like of the roller grinding head is determined, and various performance parameters of the 80m/s high-speed roller grinding head need to be tested, so that a set of performance test platform of the high-speed precise roller grinding head needs to be specially developed.
Disclosure of Invention
The invention aims to provide a performance test platform of a high-speed precision roller grinding head, which aims to overcome the problems in the prior art.
The invention is realized by the following steps:
the invention relates to a performance test platform of a high-speed precision roller grinding head, which at least comprises the following parts: the device comprises a high-speed precision roll grinding head base part, a loading part, a hydraulic system and a control system; the cylindrical roller bearing is arranged at the front end of the grinding head base part, the shifting fork piece is arranged at the tail end of the hydraulic rod of the loading part, the loading force of the loading part is derived from a hydraulic loading system, and the hydraulic loading system realizes loading on the test platform through the contact of the shifting fork piece and the outer ring of the cylindrical roller bearing.
Furthermore, the hydraulic loading system comprises a filter connected with an oil tank, the top of the filter is connected with a hydraulic pump and a motor, oil output by the hydraulic pump passes through a three-position four-way electromagnetic directional valve and then finally reaches a hydraulic cylinder through a one-way valve and a speed regulating valve which are arranged in parallel, and the shifting fork is connected with the hydraulic cylinder; an overflow valve and a proportional overflow valve connected with an oil tank are also arranged between the hydraulic pump and the reversing valve; an accumulator for absorbing pressure pulsations is also provided in the hydraulic charging system.
Furthermore, the high-speed precision roll grinding head base part comprises a main shaft, an unloading mechanism and a belt pulley are circumferentially arranged at the rear end of the main shaft, a rear dynamic and static pressure bearing and a front dynamic and static pressure bearing are arranged at two ends of the main shaft, the two bearings support the high-speed rotation of the main shaft, and belong to oil film bearings; a thrust bearing is arranged in the middle of the main shaft, a cylindrical roller bearing is circumferentially arranged at the front end of the main shaft, and the cylindrical roller bearing is installed and positioned through an installation frame; the cylindrical roller bearing is matched with a shifting fork piece in a hydraulic loading system, and the hydraulic loading force transmitted by the shifting fork piece acts on the main shaft through the cylindrical roller bearing; a box body and a box cover are arranged outside the high-speed precise roll grinding head base part.
Furthermore, the center line of the shifting fork piece push rod and the center line of the cylindrical roller bearing are eccentric to a certain degree, so that the shifting fork piece can transmit loading force and loading torque, and continuous and stepless force and torque loading on the grinding head basic platform is realized through the shifting fork piece and the cylindrical roller bearing under the control of a hydraulic loading system, so that the roller grinding experiment of the grinding head basic platform under different loads is realized.
Furthermore, a hardware circuit of the control system consists of a frequency converter speed regulating circuit and a PLC control circuit.
Further, the frequency converter speed regulation circuit comprises a main circuit of a frequency converter, a frequency conversion speed regulation motor M, a breaker QF and a contactor KM; the variable frequency speed regulating motor M drives the basic part of the high-speed precision roller grinding head and drives the main shaft through belt transmission; a motor M2 drives a cooling system to cool lubricating oil of the high-speed precision roller grinding head, and the oil temperature is controlled within an allowable range; the motor M3 drives a hydraulic pump of the loading part to provide power for the loading part; the motor M4 drives a hydraulic pump of the oil supply system to provide oil for the oil supply system of the high-speed precision roller grinding head performance test platform.
Further, a frequency converter control signal output by the PLC and an alternating current contactor KM1 control signal control a frequency converter to drive a roller grinding head spindle motor M1 to realize speed regulation and motor start and stop of a cooling system; the signal of an alternating current contactor KM3 controls a hydraulic loading pump motor M3, and the signal of an alternating current contactor KM4 controls a hydraulic oil supply pump motor M4; the control power auxiliary input terminals R0 and T0 are connected to the output side of the circuit breaker.
Furthermore, in the PLC control circuit, the PLC and the frequency converter adopt a mode of connecting a control terminal; the input terminal of the PLC is connected with the control button, the alarm and the power supply, and the output terminal is connected with the intermediate relay coil, the indicator lamp and the power supply;
the intermediate relay coils KM1 and KA3 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, so that the on-off of a main power supply of the frequency converter and the start-stop of a grinding head main shaft motor M1 and a cooling system motor M2 are controlled; the intermediate relay coils KA2 and KA4 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, so as to control the start and stop of a hydraulic loading pump motor M3 and a hydraulic oil supply pump motor M4;
PLC input terminals X002 and X003 are respectively connected with control buttons SB1 and SB2 for controlling start and stop of a motor M3 of the hydraulic loading pump; the input terminals X007 and X010 are respectively connected with control buttons SB5 and SB6 and are used for starting and stopping a motor M4 of the hydraulic oil supply pump; the input terminals X012 and X013 are respectively connected with control buttons SB8 and SB9 for the reversing control of the left position and the right position of the three-position four-way reversing solenoid valve;
the FX3U-4DA-ADP channel outputs a flow control signal of the proportional overflow valve, and the force of the overflow valve is adjusted by adjusting the analog quantity current so as to realize pressure adjustment; FX3U-4AD-ADP collects signals of all sensors on site, the sensors collect signals of a main shaft liquid hydrostatic bearing on site, the signals are sent to an upper computer after PLC operation, and the running state of a grinding head is monitored in real time; the breaker auxiliary contact QF2 provides switching value information for the power supply of the flow, pressure and oil temperature sensor.
Furthermore, an analog input signal of the frequency converter is connected with an analog output module of the PLC by a twisted-pair shielded cable; the analog input module carries out A/D conversion on signals of various sensors on the operation site of the roll grinding head and a motor output rotating speed feedback signal and transmits the signals to an upper computer, so that closed-loop control of the operation speed of a spindle motor of the roll grinding head and real-time monitoring of the operation environment are realized.
The performance test platform of the high-speed precision roll grinding head is specially used for experimental tests, is beneficial to researching various limiting factors influencing high-speed roll grinding, and has a positive promoting effect on the realization of the localization of the high-speed precision roll grinding machine.
The invention has the following technical effects:
(1) The hydraulic loading device is used for the high-speed precision roller grinding head performance test platform to replace a roller workpiece feeding system, the workpiece is not required to be ground, the test period can be shortened, and the test cost can be reduced.
(2) The experimental test of the grinding of the roller under different rotating speeds and different loads can be realized.
(3) The device can realize continuous, stepless and automatic speed and load regulation and control, and greatly improves the operability and convenience of the high-speed roller grinding experiment.
Drawings
FIG. 1 is a working schematic diagram of a high-speed precision roller grinding head performance test platform of the invention;
FIG. 2 is a schematic diagram of a hydraulic loading system of the high-speed precision roll grinding head performance test platform of the invention;
fig. 3 is an assembly view of a grinding head base portion of the invention;
FIG. 4 is a view of the yoke and cylindrical roller bearing of the present invention in combination;
FIG. 5 is a schematic diagram of a speed regulating circuit of the frequency converter of the present invention;
FIG. 6 is a schematic diagram of the PLC and inverter connections of the present invention;
fig. 7 is a three-dimensional view of the base portion of the high-speed precision roll grinding head of the present invention;
fig. 8 is an internal sectional view of a base portion of a high-speed precision roll grinding head of the present invention.
The labels in the figures are: 1-a filter, 2-a hydraulic pump, 3-a motor, 4-an overflow valve, 5-a three-position four-way electromagnetic directional valve, 6-a one-way valve, 7-a speed regulating valve, 8-a hydraulic cylinder, 9-a shifting fork piece, 10-an energy accumulator, 11-a proportional overflow valve, 12-an unloading mechanism, 13-a belt pulley, 14-a main shaft, 15-a rear dynamic and static pressure bearing, 16-a thrust bearing, 17-a box cover, 18-a front dynamic and static pressure bearing, 19-a cylindrical roller bearing, 20-a mounting frame and 21-a box body.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The working principle of the high-speed precision roller grinding head performance testing platform is shown in figure 1. The high-speed precision roller grinding head performance test platform mainly comprises a high-speed precision roller grinding head base part, a loading part, a hydraulic system, a control system and the like.
The invention aims to provide a set of test experimental device for the localization of a high-speed precision roll grinding head, and the device can be used for testing the structural performance, the thermal characteristic, the dynamic performance and the like of the high-speed precision roll grinding head under different speeds and different loads so as to provide experimental data support for the localization of the high-speed precision roll grinding head.
The structure and function of each part of the test platform of the present invention will be described and illustrated.
1. And a loading part:
the grinding head base portion is provided with a cylindrical roller bearing (such as a cylindrical roller bearing 19 in fig. 3) at the front end of the grinding head, and the loading portion is provided with a fork 9 at the end of a hydraulic rod. The hydraulic loading system realizes loading on the test platform through the contact of the shifting fork 9 and the outer ring of the cylindrical roller bearing 19.
The loading force of the loading part is derived from a set of special hydraulic loading system, the hydraulic schematic diagram of the hydraulic loading system is shown in figure 2, and the system mainly comprises a hydraulic pump 2, an overflow valve 4, a reversing valve 5, a one-way valve 6, a speed regulating valve 7, a hydraulic cylinder 8, a shifting fork member 9, an energy accumulator 10, a proportional overflow valve 11 and other elements. When the system pressure is less than the set value of the overflow valve, all the oil output by the hydraulic pump 2 is supplied to the system, and the overflow valve 4 is in a normally closed state; when the system is overloaded, the pressure of the system exceeds the set value of the overflow valve 4, the overflow valve 4 is rapidly opened, and the oil flows back to the oil tank to prevent the system from being overloaded. The accumulator 10 plays a role of absorbing pressure pulsation to make the hydraulic pressure loaded to the grinding head base portion as smooth as possible, and in addition, when sudden power failure or other malfunctions of the hydraulic system occur, the accumulator 10 can be used as a short-term energy source to separate the loading means from the grinding head base portion as shown in fig. 1, thereby protecting the grinding head base portion. The output pressure of the hydraulic system, namely the loading force applied to the grinding head base part, is adjusted and controlled by the proportional overflow valve 11, and the pressure of the system can be changed by adjusting the control current input into the proportional overflow valve 11, so that the continuous and stepless loading of the grinding head base part is realized.
The three-position four-way reversing valve 5 plays a role in changing the flow direction of oil, and when the three-position four-way reversing valve is in the position shown in the figure, namely in a middle position M function, the pump is unloaded. When the electromagnetic valve on the right side of the three-position four-way reversing valve 5 is electrified, the valve works in the right position, at the moment, high-pressure oil output by a pump flows to a rodless cavity of the hydraulic cylinder 8 from the right position of the reversing valve 5 through the one-way valve 6, so that a piston rod is pushed and a shifting fork 9 is driven to load a grinding head base part shown in the figure 1, the loading pressure of the piston rod is controlled by a proportional overflow valve 11, and return oil of a rod cavity of the hydraulic cylinder 8 flows to an oil return tank on the right position of the reversing valve 5. When the electromagnetic valve on the left of the three-position four-way reversing valve 5 is electrified, the valve works in the left position, at the moment, high-pressure oil output by the pump enters a rod cavity of the hydraulic cylinder 8 from the left position of the reversing valve 5, so that the hydraulic loading device is separated from the basic part of the grinding head, the loading pressure is unloaded, return oil in the rodless cavity of the hydraulic cylinder 8 returns to an oil tank through the speed regulating valve 7, and the return oil passes through the speed regulating valve 7, so that the return oil has back pressure, the oil return process is stable, and the oil return speed is regulated and controlled by the speed regulating valve 7.
2. The basic part of the high-speed precision roll grinding head is as follows:
the structure of the grinding head base portion is shown in fig. 3, and its three-dimensional view and sectional views are shown in fig. 7 and 8. The device mainly comprises an unloading mechanism 12, a belt pulley 13, a main shaft 14, a rear hybrid bearing 15, a thrust bearing 16, a box cover 17, a front hybrid bearing 18, a cylindrical roller bearing 19, an installation frame 20, a box body 21 and the like. The working principle of the grinding head base part is as follows: the motor drives the belt pulley 13 to rotate, and then drives the main shaft 14 to rotate, the rotation speed of the motor is determined by the motor, the rotation speed of the motor is controlled by the control system shown in fig. 1, and the main shaft 14 can rotate at different rotation speeds under the control of the control system, so that the roller grinding experiment at different rotation speeds can be realized. The two ends of the main shaft 14 are provided with a rear hybrid bearing 15 and a front hybrid bearing 18, the two bearings support the high-speed rotation of the main shaft 14, the two bearings belong to oil film bearings, lubricating oil required by the operation of the two bearings is provided by a set of special oil supply system, and the specific contents of the structures of the two bearings and the like are disclosed in the patent application document with the application number of 201310555200.9.
As shown in fig. 3, the unloading mechanism 12 mainly plays a role of unloading belt tension to avoid radial deformation of the main shaft 14 (particularly, it is explained that the unloading mechanism 12 is a general mechanical component, which is already in the prior art, so the present invention is not explained in detail herein, and the invention is mentioned here mainly for explaining and explaining the structure and working principle of the basic part of the grinding head); the thrust bearing 16 mainly functions to prevent the main shaft 14 from shifting in the left-right axial direction.
In order to simulate the grinding force and the grinding moment generated by grinding a rolled workpiece by a grinding wheel, a cylindrical roller bearing 19 is specially designed, and the bearing is installed and positioned by a mounting frame 20 as shown in fig. 3. The cylindrical roller bearing 19 is engaged with the fork 9 of the hydraulic loading system shown in fig. 2, and the hydraulic loading force transmitted from the fork 9 is applied to the main shaft 14 through the cylindrical roller bearing 19. The following are specifically mentioned: the center line of the push rod of the shifting fork 9 and the center line of the cylindrical roller bearing 19 have certain eccentricity (as shown in fig. 4), so that the shifting fork 9 transmits loading force and loading torque, and under the control of a hydraulic loading system, the continuous and stepless force and torque loading on the grinding head basic platform shown in fig. 3 can be realized through the shifting fork 9 and the cylindrical roller bearing 19, and thus, the roller grinding experiment of the grinding head basic platform under different loads can be realized.
3. A hydraulic system:
the hydraulic system shown in fig. 1 is primarily to provide lubrication oil to the rear hybrid bearing 15, thrust bearing 16 and front hybrid bearing 18 of fig. 3. Note that the hydraulic system referred to here is two different systems from the hydraulic loading system shown in fig. 2 above. The hydraulic system mentioned here is an oil supply system dedicated to supplying oil film lubricating oil, and the hydraulic system shown in fig. 2 is a hydraulic system for realizing loading, and is two completely different systems.
4. The control system comprises:
according to the control requirement of the high-speed precision roller grinding head performance test platform during operation and the characteristics of an electrical control system, a hardware circuit of the system consists of a frequency converter speed regulating circuit and a PLC control circuit.
Frequency converter speed control circuit:
the frequency converter speed regulation circuit mainly comprises a main circuit of a frequency converter, a frequency conversion speed regulation motor M, a breaker QF, a contactor KM and the like, and is shown in figure 5. The motor M1 drives a basic part of the high-speed precision roll grinding head and drives a main shaft through belt transmission; a motor M2 drives a cooling system to cool lubricating oil of the high-speed precision roller grinding head, and the oil temperature is controlled within an allowable range; the motor M3 drives a hydraulic pump of the loading part to provide power for the loading part; and the motor M4 drives a hydraulic pump of the oil supply system to provide oil for the oil supply system of the high-speed precision roller grinding head performance test platform.
And a frequency converter control signal output by the PLC and an alternating current contactor KM1 control signal control the frequency converter to drive a roller grinding head spindle motor M1 to realize speed regulation and start and stop of a motor of a cooling system. The signal of the alternating current contactor KM3 controls a hydraulic loading pump motor M3, and the signal of the alternating current contactor KM4 controls a hydraulic oil supply pump motor M4. The auxiliary input terminals R0 and T0 of the control power supply are connected to the output side of the circuit breaker so as to prevent the control circuit of the frequency converter from losing power when the frequency converter switch is disconnected when the frequency converter protection function acts.
Through the control system of fig. 5, the high-speed precision roller grinding head performance test platform can realize the stepless speed regulation function of the main shaft.
The PLC control circuit: the PLC and the frequency converter adopt a mode of connecting a control terminal. The input terminals of the PLC are connected to the control button, alarm and power supply, and the output terminals are connected to the intermediate relay coil, indicator light and power supply, as shown in fig. 6.
The intermediate relay coils KM1 and KA3 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, so that the on-off of a main power supply of the frequency converter and the start and stop of the grinding head spindle motor M1 and the cooling system motor M2 are controlled. The intermediate relay coils KA2 and KA4 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, and then start and stop of the hydraulic loading pump motor M3 and the hydraulic oil supply pump motor M4 are controlled.
PLC input terminals X002 and X003 are respectively connected with control buttons SB1 and SB2 for controlling start and stop of a motor M3 of the hydraulic loading pump; the input terminals X007 and X010 are respectively connected with control buttons SB5 and SB6 and are used for starting and stopping a motor M4 of the hydraulic oil supply pump; the input terminals X012 and X013 are respectively connected with control buttons SB8 and SB9 for the left and right commutation control of the three-position four-way commutation solenoid valve.
And a flow control signal of the proportional overflow valve 11 is output by a channel of the FX3U-4DA-ADP, and the force of the overflow valve 4 can be adjusted by adjusting the analog quantity current, so that the pressure adjustment is realized. FX3U-4AD-ADP collects signals of various sensors on site, the sensors collect field signals of oil temperature, oil line pressure, flow, motor rotating speed and the like of a main shaft liquid hydrostatic bearing, the field signals are sent to an upper computer after PLC operation, and the running state of a grinding head is monitored in real time. The input impedance of the analog input module is high, the distance between the signal transmission circuit and the PLC is long, the acquired signal of the sensor needs to be converted into a standard signal DC 4-20 mA through the transmitter, and the standard signal DC is displayed on the touch screen after A/D conversion is carried out on each channel of the analog input module and analog operation of a PLC program is carried out on the analog input module. The breaker auxiliary contact QF2 provides switching value information for the power supply of the flow, pressure and oil temperature sensor.
The analog input signal of the frequency converter is connected with the analog quantity output module of the PLC by a twisted pair shielded cable. The analog input module carries out A/D conversion on signals of various sensors and motor output rotating speed feedback signals on the operation site of the roll grinding head and sends the signals to an upper computer, and closed-loop control of the operation speed of a spindle motor of the roll grinding head and real-time monitoring of the operation environment are achieved.
Through the control system shown in fig. 5 and 6, the high-speed precision roller grinding head performance test platform can meet the control requirements of the grinding head base part and the loading part, and the requirements of speed change and load change of the high-speed precision roller grinding head performance test platform are met.
The application is as follows: the invention provides a set of test experimental device for the localization process of the high-speed precise roller grinding head, and the device can test the structural performance, the thermal characteristic, the dynamic performance and the like of the high-speed precise roller grinding head under different speeds and different loads, so that experimental data support is provided for the localization of the high-speed precise roller grinding head.
It should be understood that the above description is only an example of the present invention, and other embodiments of the present invention may also be adopted, and equivalents or equivalent changes may be made within the scope of the present invention as claimed.
Claims (7)
1. The utility model provides a performance test platform of high-speed accurate roll bistrique which characterized in that: the test platform at least comprises the following parts: the device comprises a high-speed precision roll grinding head base part, a loading part, a hydraulic system and a control system; the front end of a main shaft of a grinding head base part is provided with a cylindrical roller bearing, the tail end of a hydraulic rod of a loading part is provided with a shifting fork piece (9), the loading force of the loading part comes from a hydraulic loading system, and the hydraulic loading system realizes loading on a test platform by the contact of the shifting fork piece (9) and the outer ring of the cylindrical roller bearing (19);
the hydraulic loading system comprises a filter (1) connected with an oil tank, the top of the filter (1) is connected with a hydraulic pump (2) and a motor (3), oil output by the hydraulic pump (2) passes through a three-position four-way electromagnetic directional valve (5) and then finally reaches a hydraulic cylinder (8) through a one-way valve (6) and a speed regulating valve (7) which are arranged in parallel, and a shifting fork piece (9) is connected with the hydraulic cylinder (8); an overflow valve (4) and a proportional overflow valve (11) which are connected with an oil tank are also arranged between the hydraulic pump (2) and the reversing valve (5); an accumulator (10) for absorbing pressure pulsation is also arranged in the hydraulic loading system; a cylindrical roller bearing (19) is circumferentially arranged at the front end of the main shaft (14), the cylindrical roller bearing (19) is matched with a shifting fork piece (9) in a hydraulic loading system, and the hydraulic loading force transmitted by the shifting fork piece (9) acts on the main shaft (14) through the cylindrical roller bearing (19); the center line of the push rod of the shifting fork piece (9) and the center line of the cylindrical roller bearing (19) have certain eccentricity, so that the shifting fork piece (9) transmits loading force and loading torque, and continuous and stepless force and moment loading on the grinding head basic platform is realized through the shifting fork piece (9) and the cylindrical roller bearing (19) under the control of a hydraulic loading system, so that a roller grinding experiment of the grinding head basic platform under different loads is realized.
2. The performance testing platform of the high-speed precision roll grinding head according to claim 1, characterized in that: the high-speed precision roll grinding head base part comprises a main shaft (14), an unloading mechanism (12) and a belt pulley (13) are circumferentially arranged at the rear end of the main shaft (14), a rear dynamic and static pressure bearing (15) and a front dynamic and static pressure bearing (18) are arranged at the front end and the rear end of the main shaft (14), the two bearings support the high-speed rotation of the main shaft, and belong to oil film bearings; a thrust bearing (16) is arranged in the middle of the main shaft (14), and the cylindrical roller bearing (19) is installed and positioned through an installation frame (20); a box body (21) and a box cover (17) are arranged outside the high-speed precise roll grinding head base part.
3. The performance testing platform of the high-speed precision roll grinding head according to claim 1, characterized in that: and a hardware circuit of the control system consists of a frequency converter speed regulating circuit and a PLC control circuit.
4. The performance testing platform of the high-speed precision roll grinding head according to claim 3, characterized in that: the frequency converter speed regulating circuit comprises a main circuit of a frequency converter, a frequency conversion speed regulating motor M, a breaker QF and a contactor KM; wherein, the frequency conversion speed regulating motor M drives the basic part of the high-speed precision roll grinding head and drives a main shaft (14) through belt transmission; the motor M2 drives a cooling system to cool lubricating oil of the high-speed precision roller grinding head, and the oil temperature is controlled within an allowable range; the motor M3 drives a hydraulic pump of the loading part to provide power for the loading part; the motor M4 drives a hydraulic pump (2) of the oil supply system to provide oil for the oil supply system of the high-speed precision roller grinding head performance test platform.
5. The performance testing platform of the high-speed precision roll grinding head according to claim 3, characterized in that: a frequency converter control signal output by the PLC and an alternating current contactor KM1 control signal control the frequency converter to drive a roller mill head spindle motor M1 to realize speed regulation and motor start and stop of a cooling system; the signal of an alternating current contactor KM3 controls a hydraulic loading pump motor M3, and the signal of an alternating current contactor KM4 controls a hydraulic oil supply pump motor M4; the control power auxiliary input terminals R0, T0 are connected to the output side of the circuit breaker.
6. The performance test platform of the high-speed precise roll grinding head according to claim 3, characterized in that: in the PLC control circuit, the PLC and the frequency converter adopt a mode of connecting a control terminal; the input terminal of the PLC is connected with a control button, an alarm and a power supply, and the output terminal is connected with an intermediate relay coil, an indicator light and the power supply; the intermediate relay coils KM1 and KA3 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, so as to control the on-off of a main power supply of the frequency converter and the start and stop of a grinding head main shaft motor M1 and a cooling system motor M2; the intermediate relay coils KA2 and KA4 are respectively connected with the coils of the main circuit contactor through normally open contacts thereof, so as to control the start and stop of a hydraulic loading pump motor M3 and a hydraulic oil supply pump motor M4; PLC input terminals X002 and X003 are respectively connected with control buttons SB1 and SB2 for controlling start and stop of a hydraulic oil supply pump motor M4; the input terminals X007 and X010 are respectively connected with control buttons SB5 and SB6 and are used for starting and stopping a motor M4 of the hydraulic oil supply pump; the input terminals X012 and X013 are respectively connected with control buttons SB8 and SB9 for the reversing control of the left position and the right position of the three-position four-way reversing solenoid valve; a channel of the PLC outputs a flow control signal of the proportional overflow valve (11), and the force of the overflow valve (4) is adjusted by adjusting the magnitude of the analog quantity current, so that the pressure adjustment is realized; the PLC acquires signals of various sensors on site, the sensors acquire signals of the main shaft (14) liquid hydrostatic bearing on site, the signals are sent to an upper computer after PLC operation, and the running state of the grinding head is monitored in real time; the breaker auxiliary contact QF2 provides switching value information for the power supply of the flow, pressure and oil temperature sensor.
7. The performance testing platform of the high-speed precision roll grinding head according to claim 5, characterized in that: the analog input signal of the frequency converter is connected with the analog output module of the PLC by a twisted-pair shielded cable; the analog input module carries out A/D conversion on signals of various sensors and motor output rotating speed feedback signals on the operation site of the roll grinding head and sends the signals to an upper computer, and closed-loop control of the operation speed of a spindle motor of the roll grinding head and real-time monitoring of the operation environment are achieved.
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| CN109604348B (en) * | 2019-01-11 | 2023-11-03 | 中冶赛迪工程技术股份有限公司 | Simulation loading and integrated testing system and method for hydraulic roller bending device of plate and strip rolling mill |
| CN111175039B (en) * | 2020-03-06 | 2021-02-09 | 常熟理工学院 | Fatigue testing device and method for engine valve and valve seat ring |
| CN113400194A (en) * | 2021-04-08 | 2021-09-17 | 齐重数控装备股份有限公司 | Hydraulic system of numerical control roller snagging machine tool |
| CN113296463A (en) * | 2021-05-17 | 2021-08-24 | 潍坊特钢集团有限公司 | Control system of metal square billet machining device and implementation method thereof |
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| JP2003300156A (en) * | 2002-04-09 | 2003-10-21 | Daido Steel Co Ltd | Grinding performance evaluating method |
| KR100725578B1 (en) * | 2006-05-29 | 2007-06-08 | 새솔다이아몬드공업 주식회사 | Test method of diamond disc cutting power |
| JP2008188677A (en) * | 2007-01-31 | 2008-08-21 | Toshiba Corp | Automatic grinding device and automatic grinding method |
| CN101941102B (en) * | 2010-08-27 | 2012-01-11 | 西安理工大学 | Displacement analog loading device of form grinding wheel gear grinding machine and method for detecting rigidity distribution |
| CN202517372U (en) * | 2012-04-09 | 2012-11-07 | 上海理工大学 | Grinding fluid dynamic pressure measuring device for plane grinding area |
| CN102680218B (en) * | 2012-04-25 | 2015-08-26 | 中国铁道科学研究院金属及化学研究所 | A kind of testing table for grinding wheel and test method thereof |
| CN104989703B (en) * | 2015-07-20 | 2017-11-24 | 北京工业大学 | A kind of numerically control grinder Hydraulic System Reliability experimental rig |
| CN105328567A (en) * | 2015-11-27 | 2016-02-17 | 贵州大学 | Structure of adjustable high-speed precise roller grinding head and manufacturing method of structure |
| CN205148047U (en) * | 2015-11-27 | 2016-04-13 | 贵州大学 | High -speed precision roll bistrique with adjustable |
| CN105415192A (en) * | 2015-12-15 | 2016-03-23 | 昆山华辰重机有限公司 | Novel measuring mechanism of full-automatic numerical control roll grinder |
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