CN110243602B - Low-temperature wear test system for joint bearing and assembling method thereof - Google Patents
Low-temperature wear test system for joint bearing and assembling method thereof Download PDFInfo
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- CN110243602B CN110243602B CN201910652974.0A CN201910652974A CN110243602B CN 110243602 B CN110243602 B CN 110243602B CN 201910652974 A CN201910652974 A CN 201910652974A CN 110243602 B CN110243602 B CN 110243602B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0228—Low temperature; Cooling means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention provides a low-temperature wear test system for a joint bearing, which comprises a base, a temperature box, a radial stress subsystem, a power subsystem, a temperature control subsystem, a wear measurement subsystem and a clamp subsystem. The fixture subsystem comprises a top block, a loading plate, an accompanying bearing seat, a mandrel, an accompanying bearing, an end cover and a locking part, wherein the parts are independent detachable parts, and the mandrel, the top block or the loading plate can be replaced to clamp the life test of the knuckle bearings with different diameters, so that the utilization rate and the universality of the test fixture are improved; in addition, the fixture subsystem adopts structural design improvements that a single-side flange is added to an inner hole of the loading plate, the thickness of the jacking block is reduced, the flange and the end cover cooperate to fix the test-accompanying bearing and the like, and mandrel deformation or fracture which is easy to occur in the process of a joint bearing abrasion test is effectively avoided.
Description
Technical Field
The invention belongs to the technical field of reliability identification of mechanical equipment; in particular to a low-temperature wear test system for a joint bearing and an assembling method thereof.
Background
The low-temperature wear test of the joint bearing is used for evaluating the wear resistance index of the joint bearing in a low-temperature environment, and is an important criterion for judging the design, research, development, customization and model selection of the joint bearing model product. In the low-temperature abrasion identification test process, the control of temperature, load and reciprocating motion state is required to be controlled in real time, and the running period of the whole test process is long, so that a test system with high automation degree is required to realize that external environment conditions, load conditions and running conditions can meet the requirements of the identification test outline in real time, the abrasion loss and the temperature of a tested bearing can be monitored in real time, the influence of human factors on the test result is reduced, and the accuracy of test result judgment is ensured.
However, the existing system has the following problems: (1) the existing life test fixture structure can not ensure the rigidity of the mandrel, the mandrel is easy to brittle fracture under large bending moment generated under the action of large radial load, taking an aviation low-speed heavy-load wide-series self-lubricating knuckle bearing as an example, the radial load of the life test is 1.3-1.5 times of that of other types of knuckle bearings with the same inner diameter, and the mandrel is easy to brittle fracture; (2) the existing life test clamp has poor design universality, and when the life test of different types of knuckle bearings is completed, clamps of various specifications are needed, so that the huge waste of funds, time and resources is caused; (3) the test fixture is heavy, the space of the temperature box is relatively narrow, the tested product and the test fixture are not easy to mount and fix, the mounting process is relatively complex and laborious, and the test preparation time is greatly prolonged.
Disclosure of Invention
The invention aims to provide a joint bearing low-temperature wear test system and an assembling method thereof, wherein the joint bearing low-temperature wear test system has strong universality and reliable performance, is convenient for test piece disassembly and assembly and can realize automatic control and signal acquisition.
In order to solve the technical problem, the invention provides a low-temperature wear test system for a joint bearing, which comprises a base, a temperature box, a radial stress subsystem for generating radial load of the bearing to be tested, a power subsystem for generating swing torque of the bearing to be tested, a temperature control subsystem for controlling the temperature of a test environment, a wear measurement subsystem for monitoring the radial wear amount of the bearing to be tested and a clamp subsystem for fixedly mounting the joint bearing to be tested; the clamp subsystem of the system comprises two jacking blocks, a loading plate, two test bearing seats, a mandrel, two test bearings, an end cover and a locking part;
the first end of the loading plate is connected with the stress subsystem, the second end of the loading plate is in clearance fit with the outer ring of the tested knuckle bearing and is used for applying the radial stress generated by the stress subsystem to the outer ring of the tested knuckle bearing, and the second end of the loading plate is provided with a flange capable of axially fixing one side of the outer ring of the tested knuckle bearing;
the two ejector blocks are respectively provided with a central hole, the inner ring of the central hole is in clearance fit with the mandrel, and the two ejector blocks are respectively positioned on the left side and the right side of the tested knuckle bearing;
the mandrel penetrates through the inner ring of the tested knuckle bearing and the two jacking blocks, the mandrel is in clearance fit with the inner ring of the tested knuckle bearing, and the second end of the mandrel is connected with the power subsystem;
the locking component is used for clamping the two top blocks from the left side and the right side to the inner ring of the tested knuckle bearing;
the two test accompanying bearing blocks are axially and symmetrically arranged on the base, each test accompanying bearing block is provided with an inner hole for installing the test accompanying bearing, the inner ring of each inner hole is in clearance fit with the outer ring of the test accompanying bearing, a first surface of each inner hole, facing the bearing to be tested, is provided with a flange, a second surface, opposite to the bearing to be tested, is blocked by an end cover, and the flanges and the end covers are used for axially fixing the test accompanying bearing;
and the two inner rings of the test-accompanying bearing are in clearance fit with the two jacking blocks and are used for providing support for the tested joint bearing.
Preferably, the clamp subsystem further comprises a bushing, the bushing is a cylindrical hollow tube, an inner ring of the bushing is in clearance fit with the outer surface of the mandrel, and the bushing with the corresponding length can be replaced to adapt to different width series of joint bearings to complete an identification test.
Preferably, the second end of dabber has the abnormal shape groove, the abnormal shape groove side edge be equipped with the shaft complex abnormal shape through-hole of power subsystem transmission moment of torsion, the dabber with the shaft of power subsystem transmission moment of torsion passes through abnormal shape groove and abnormal shape through-hole are connected. .
Preferably, be equipped with the spout on the base, accompany examination bearing frame fixed mounting in on the spout, and two accompany examination bearing frame and can follow the spout and adjust its relative distance.
Preferably, the two test bearings are double-row self-aligning roller bearings; the test-accompanying bearing is convenient for aligning, can shorten the test preparation time, can reduce the mounting stress during mounting, and improves the test accuracy.
Preferably, the power subsystem comprises a motor, a motor base, a lead screw and a hand wheel; the motor is fixed on the motor base, the lead screw and the hand wheel are connected with the motor base, the motor base is driven to move along the axial direction of the mandrel, and the hand wheel is provided with a mechanical lock for fixing the position of the motor base.
Preferably, the power subsystem further comprises a coupling.
Preferably, the power subsystem further comprises a box penetrating shaft, the box penetrating shaft is connected with the shaft center through a side hole of the temperature box, a sealing part is arranged between an outer ring of the box penetrating shaft and the side hole of the temperature box, and the outer ring of the box penetrating shaft is loosely matched with the sealing part.
Preferably, the invention also provides an assembling method of the joint bearing low-temperature wear testing system, which comprises the following steps:
step 1, placing the power subsystem at a proper distance, and enabling a shaft for transmitting torque of the power subsystem to penetrate through a side hole of the temperature box;
step 6, checking the temperature control subsystem, and enabling the abrasion measurement subsystem to work normally;
and 7, starting the temperature box, adjusting the environmental temperature in the temperature box to reach a specified value in a verification test outline, controlling the stress subsystem to apply a specified load value in the verification test outline to the tested knuckle bearing through the loading plate, and controlling the power subsystem to periodically and reciprocally swing according to the parameter requirements in the verification test outline until the specified test times are reached.
Preferably, the method further comprises a step 8 for disassembling, wherein the step 8 specifically comprises the following steps:
step 81, after the low-speed wear identification test is finished, unloading the radial force of the tested knuckle bearing, adjusting the environmental temperature in the temperature box to recover the room temperature, and then opening the temperature box;
step 82, disconnecting the connection between the mandrel and a motor shaft of the motor;
step 83, detaching the test-accompanying bearing seat from the base, taking out the left test-accompanying bearing assembly, and then taking out the test bearing assembly;
and 84, unscrewing the locking component, and sequentially taking down the left ejector block, the loading plate, the tested knuckle bearing and the right ejector block from the mandrel 13 to finish disassembly.
Compared with the prior art, the scheme has the following beneficial effects:
(1) the clamp is easy to disassemble and assemble and has strong universality. The top block, the loading plate and the bush are independent parts, the disassembly is convenient, the clamping of the service life tests of the joint bearings of series with different widths can be realized by replacing the bush, the clamping of the service life tests of the joint bearings with different diameters can be realized by replacing the mandrel, the top block and the loading plate, the utilization rate of the test fixture is high, and the universality is good; (2) the structure atress is reasonable, adopts the load plate hole to increase unilateral flange, reduces the tapering of kicking block, flange and end cover fixed structural design improvement such as accompanying the examination bearing in coordination, has effectively avoided the dabber that highly easily takes place among the high-speed heavy load self-lubricating bearing test process to warp or fracture.
Drawings
FIG. 1 is a schematic structural diagram of a low-temperature wear test system of a joint bearing; and
FIG. 2 is a schematic diagram of a control circuit of the low-temperature wear test system of the joint bearing.
Detailed Description
The embodiment of the invention discloses a low-temperature wear test device for a joint bearing as shown in figure 1, which comprises: the device comprises a lead screw 1, a motor 2, a motor shaft 3, a rubber sleeve 4, a top block 51, a top block 52, an electro-hydraulic oil cylinder 6, a displacement sensor 7, a rack 8, a loading plate 9, a bearing seat 101, a bearing seat 102, a tested knuckle bearing 11, a nut 12, a mandrel 13, an elastic gasket 14, a bushing 15, a temperature sensor 16, a reflective strip 17, an end cover 181, an end cover 182, a test-accompanying bearing 191, a test-accompanying bearing 192, a base 20, an adapter 21, a temperature box 22, a box penetrating shaft 23, a flange shaft 24, a coupling 25, a motor seat 26, a hand wheel 27 and a control circuit 28.
In the embodiment, the mandrel is in clearance fit with the inner ring of the tested knuckle bearing by 0.013-0.038 mm; the material of the mandrel is 9Cr18 bearing steel; the material of the loading plate is Q275 carbon steel; other test fixture materials in the temperature box are all stainless steel; the special-shaped shaft end of the mandrel and the central special-shaped hole of the special-shaped adapter are oval; the through hole on the side surface of the loading plate is a threaded hole of M5; the thickness of the inner hole flange of the test bearing seat is 0.7 mm; the thickness of the inner hole flange of the loading plate is 0.7 mm; the surface hardness of the mandrel is not less than 50 HRC; the test-accompanying bearing adopts a double-row self-aligning rolling bearing; the lubrication mode of the accompanying bearing is grease lubrication; the temperature sensor is a thermocouple sensor; the displacement sensor is a laser displacement sensor; the rubber sleeve is made of Polytetrafluoroethylene (PTFE) and cotton yarn is used for properly sealing a gap between the rubber sleeve and the box penetrating shaft.
The motor 2 is fixed on the motor base 26, and the roller and the raceway are installed to the motor base 26 lower extreme, can realize the removal in the certain limit along the axial. The motor base 26 moves and is manually driven by the lead screw 1 and the hand wheel 27, and the hand wheel 27 is provided with a mechanical lock to ensure that the motor 2 is fixed in the working process.
The motor shaft 3 is connected with the motor 2, so that the rotary motion of the motor 2 is transmitted to the joint bearing test fixture in the temperature box through the coupler 25, the flange shaft 24 and the box penetrating shaft 23, and the rotating speed of the tested joint bearing 11 is accurately controlled by controlling the rotating speed of the motor 2.
The electro-hydraulic oil cylinder 6 is arranged at the upper end of the rack 8 and used for providing a radial load effect on the joint bearing test fixture, the electro-hydraulic oil cylinder 6 is controlled by a control circuit 28 through a cable, a flange plate of the electro-hydraulic oil cylinder 6 penetrates through the temperature box 22 to be connected with the loading plate 9, the force is transmitted to the outer ring of the tested joint bearing 11 through the loading plate 9 and is applied to the outer ring of the tested joint bearing 11, a pressure sensor in the electro-hydraulic oil cylinder 6 feeds the load condition back to the control circuit 28, and then the accurate control of applying the radial load to the tested.
And the inner ring of the loading plate 9 is in clearance fit with the tested spherical plain bearing 11. The loading plate is connected with a loading device and applies radial loading to the tested spherical plain bearing 11 according to the specification of a radial loading section. The loading plate 9 is designed with a flange which can circumferentially fix one surface of the outer ring of the tested oscillating bearing 11, and the other surface is axially clamped through the main shaft of the testing machine.
The jacking block 51 and the jacking block 52 penetrate through the mandrel 13, are matched through the nut 12, the elastic gasket 14 and the bush 15, and axially clamp the inner ring of the tested knuckle bearing 11 to fix the inner ring, and the clamping force is not too large, so that the increase of friction torque caused by the deformation of the inner ring of the tested knuckle bearing 11 is avoided, and the abrasion of the self-lubricating gasket is accelerated. The heights of the top block 51 and the top block 52 are as small as possible, so that the distance between the fulcrums of the test bearing 191 and the test bearing 192 is shortened, and the bending moment born by the core shaft 13 is reduced.
Bearing frame 101 and bearing frame 102 pass through T type groove and bolt installation fixed on base 20, and bearing frame 101 and the hole design of bearing frame 102 have the flange on one side, another side circumference equipartition screw hole connection end cover 181 and end cover 182, accompany and try on bearing 191 and accompany and try on bearing 192 and install in the hole of bearing frame 102 and bearing frame 101 and by flange and end cover 181 and end cover 182 axial fixity.
The test-accompanying bearing 191 and the test-accompanying bearing 192 are used as test-accompanying bearings in the life test process, are fixed on the bearing seat 10, provide radial support for the tested knuckle bearing 11, and assist the rotation of the inner rings of the test-accompanying bearing 191 and the test-accompanying bearing 192.
The mandrel 13 is in clearance fit with an inner hole of the tested knuckle bearing 11, a thread is processed at one end of the mandrel, the inner ring of the tested knuckle bearing 11 is clamped by the ejector block 51, the ejector block 52 and the nut 12, a special-shaped groove is processed at the other end of the mandrel, and the mandrel is connected with the box penetrating shaft 23 through the thread of the adapter 21, so that the tested knuckle bearing 11 can periodically complete reciprocating swing of the inner ring according to the specification of a test outline.
The bushing 15 is a cylindrical hollow tube, and the inner ring of the bushing is in clearance fit with the outer surface of the mandrel 13. By replacing the bush 15 with corresponding length, the joint bearing can adapt to different width series to complete the identification test.
The special-shaped through hole in the center of the adapter 21 is matched with the special-shaped groove of the mandrel 13 to transmit torque. A plurality of threaded holes are uniformly distributed in the circumferential direction of the adapter 21 and are connected with a flange penetrating through the box shaft 23 through threaded connection.
Wear the outer wall that case axle 23 passed temperature case 22, realize the connection of the inside and outside structure of temperature case 22, wear case axle 23 and pass the box of temperature case 22 through rubber sleeve 4 to be the loose fit with rubber sleeve 4, rubber material can reduce the wearing and tearing that take place when wearing case axle 23 to pass temperature case 22, also can reduce the quick heat exchange of incasement temperature and external world, guaranteed the inside constancy of presetting the temperature of temperature case well.
The coupler 25 can effectively reduce bending moment caused by the operating vibration and the mounting decentration of the motor 2, and improve the accuracy and the accuracy of the identification test result.
The temperature sensor 16 is installed in a through hole formed in the side surface of the loading plate 9, monitors the temperature of the outer ring of the knuckle bearing 11 to be tested in real time, stops the identification test immediately when the temperature exceeds a predetermined value, and inspects the knuckle bearing 11 to be tested and the test system.
The displacement sensor 7 is installed on the top end of the rack 8, the radial abrasion loss of the tested knuckle bearing 11 is monitored in real time through the collection of the radial displacement of the loading plate 9, the bottom end of the loading plate 9 extends out of the light reflecting strip 16 to be matched with the displacement sensor 7 for use, and the light reflecting strip 16 is fixedly connected with the loading plate 9 through threads.
The control circuit 28 is connected with the motor 2, the temperature box 22, the electro-hydraulic cylinder 6, the displacement sensor 7 and the temperature sensor 16 through cables as shown in figure 2. The control circuit 28 sends instructions to control the rotating speed, the steering and the running time of the motor 2, the temperature value, the temperature change speed and the heat preservation time of the temperature box 22 and the output load of the electro-hydraulic oil cylinder 6. Meanwhile, the control circuit 28 monitors and records the displacement value and the temperature value acquired by the displacement sensor 7 and the temperature sensor 16 in real time.
The assembly and disassembly of the tested piece in the low-temperature wear test process by using the low-temperature wear identification test system for the self-lubricating joint bearing are simple and convenient to operate, and the tested product is installed in the low-speed wear verification test according to the following steps:
slowly rotating the hand wheel 27 to slide the motor 2 for a proper distance to the right, and enabling the motor shaft 3 to penetrate through the box penetrating shaft 23 from a side hole of the temperature box 22 and be fastened with the flange shaft 24 and the coupler 25 by bolts;
composing the test-accompanying bearing assembly: respectively installing the test-accompanying bearing 191 and the test-accompanying bearing 192 into the central holes of the bearing seat 102 and the bearing seat 101, and locking the test-accompanying bearing 191 and the test-accompanying bearing 192 by using the end cover 181, the end cover 182 and the threads;
make-up test bearing assembly: respectively enabling the top block 51, the top block 52, the tested knuckle bearing 11, the loading plate 9 and the bush 15 to penetrate through the mandrel 13, locking the mandrel 13 by using the elastic gasket 14 and the nut 12, and matching the special-shaped groove of the mandrel 13 with the inner hole of the adapter 21;
the test bearing assembly is initially installed on the base 20, and the test bearing assembly penetrates through a center hole of the test-accompanying bearing, the position is adjusted, the two bearing seats are close to each other as much as possible, and the alignment on a shaft system needs to be ensured. After ensuring that the bearing is not subjected to lateral force, connecting the loading plate 9 with a flange of the electro-hydraulic oil cylinder 6 by using bolts, and fixedly installing the bearing seat 101 and the bearing seat 102 on a T-shaped groove of the base 20 by using bolts;
after all parts are installed and fixed, the inner ring of the tested knuckle bearing 11 is slightly rotated to ensure that the tested knuckle bearing 11 is not subjected to lateral force;
slightly shaking the hand wheel 27, moving the motor 2 to slide leftwards, ensuring that the special-shaped groove of the mandrel 13 is completely inserted into the central hole of the adapter 21 and well jointed, carefully checking the whole shaft system to ensure the centering performance, avoiding influencing the accuracy of the test result, and locking a mechanical lock on the hand wheel 27;
checking the relative position between the displacement sensor 7 and the light reflecting strip 17 to ensure that the displacement sensor 7 can effectively record the radial displacement of the loading plate 9, and installing a temperature sensor 16 to be inserted and fixed in a through hole on the side surface of the loading plate 9 to ensure that the temperature sensor 16 can effectively measure the temperature of the outer ring of the tested oscillating bearing 11;
the cabin door of the temperature box 22 is closed, the control circuit 28 sends an instruction to start the temperature box 22, after the environmental temperature in the temperature box 22 is adjusted to reach a specified value in the verification test outline, the electro-hydraulic oil cylinder 6 is controlled to apply a specified load value in the verification test outline to the tested knuckle bearing 11 through the loading plate 9, and the motor 2 is controlled to periodically and reciprocally swing according to parameter requirements in the verification test outline until the specified test times are reached.
After the low-speed wear verification test is finished, the tested knuckle bearing is disassembled according to the following steps:
after the low-speed wear identification test is finished, the control circuit 28 sends an instruction to unload the radial force of the tested oscillating bearing 11, and after the environmental temperature in the temperature box 22 is adjusted to return to the room temperature, the cabin door of the temperature box 22 is opened;
taking out the temperature sensor 16 from the through hole on the side surface of the loading plate 9;
opening a mechanical lock on the hand wheel 27, and slightly shaking the hand wheel 27 to enable the shaft system of the motor 2 to slide rightwards until the special-shaped groove of the mandrel 13 is completely separated from the central hole of the adapter 21;
the bolt between the bearing seat 102 and the T-shaped groove of the base 20 is disassembled, the test-accompanying bearing assembly on the left side, including the bearing seat 102, the test-accompanying bearing 191 and the end cover 181, is taken out, and then the test bearing assembly is taken out;
disassembling the nut 12, and sequentially disassembling the elastic gasket 14, the bush 15, the top block 52, the loading plate 9, the tested knuckle bearing 11 and the top block 51 from the mandrel 13 to finish the disassembly of the tested knuckle bearing;
finally, the bolts securing bearing housing 101 are loosened and the right hand test bearing assembly, including bearing housing 101, test bearing 192 and end cap 182, is removed
The embodiment realizes the control of the temperature, the load and the reciprocating motion state which can be automatically operated, and can monitor the abrasion loss and the temperature of the tested bearing in real time, thereby effectively reducing the interference of human factors on the test result and ensuring the accuracy of the judgment of the test result; the top block 51, the top block 52, the loading plate 9 and the bush 15 are independent parts, so that the disassembly is convenient, the clamping of the life tests of the knuckle bearings with different widths can be realized by replacing the bush 15, the clamping of the life tests of the knuckle bearings with different diameters can be realized by replacing the mandrel 13, the top block 51, the top block 52 and the loading plate 9, the utilization rate of the test clamp is high, the universality is good, the resources can be saved, and the occupied area of equipment inventory can be reduced; in addition, this embodiment adopts the hole of loading plate 9 to increase unilateral flange, reduce the tapering of kicking block, flange and end cover cooperate fixed to accompany structural design improvement such as examination bearing 191 and accompany examination bearing 192, has effectively avoided the dabber that highly easily takes place to warp or fracture in the high-speed heavy load self-lubricating bearing test process to can accomplish the assembly of being examined the bearing in narrow and small space, it is also very convenient to dismantle, has shortened life-span test preparation time by a wide margin.
The above is only a preferred embodiment of this patent and is not intended to limit the patent, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present patent shall be included in the protection scope of the present patent.
Claims (7)
1. A low-temperature wear test system for a joint bearing comprises a base, a temperature box, a radial stress subsystem for generating radial load of the bearing to be tested, a power subsystem for generating swing torque of the bearing to be tested, a temperature control subsystem for controlling test environment temperature, a wear measurement subsystem for monitoring radial wear of the bearing to be tested, a clamp subsystem for fixedly mounting the joint bearing to be tested and a control circuit, and is characterized in that the clamp subsystem comprises two ejector blocks, a loading plate, two test-accompanying bearing seats, a mandrel, two test-accompanying bearings, an end cover and a locking part;
the first end of the loading plate is connected with the stress subsystem, the second end of the loading plate is in clearance fit with the outer ring of the to-be-tested knuckle bearing and is used for applying the radial stress generated by the stress subsystem to the outer ring of the to-be-tested knuckle bearing, and the second end of the loading plate is provided with a flange capable of axially fixing the outer ring of the to-be-tested knuckle bearing;
the two ejector blocks are respectively provided with a central hole, the inner ring of the central hole is in clearance fit with the mandrel, and the two ejector blocks are respectively positioned on the left side and the right side of the knuckle bearing to be tested;
the mandrel penetrates through the inner ring of the knuckle bearing to be tested and the two jacking blocks, the mandrel is in clearance fit with the inner ring of the knuckle bearing to be tested, and the second end of the mandrel is connected with the power subsystem;
the locking part is used for clamping the two top blocks from the left side and the right side to the inner ring of the joint bearing to be tested;
the two test accompanying bearing blocks are axially and symmetrically arranged on the base, each test accompanying bearing block is provided with an inner hole for installing the test accompanying bearing, the inner ring of each inner hole is in clearance fit with the outer ring of the test accompanying bearing, a first surface of each inner hole, facing the bearing to be tested, is provided with a flange, a second surface, opposite to the bearing to be tested, is blocked by an end cover, and the flanges and the end covers are used for axially fixing the test accompanying bearing;
the two test-accompanying bearing inner rings are in clearance fit with the two ejector blocks and used for providing support for the knuckle bearing to be tested;
the second end of the mandrel is provided with a special-shaped groove, the side edge of the special-shaped groove is provided with a special-shaped through hole matched with a shaft of the power subsystem for transmitting torque, and the mandrel is connected with the shaft of the power subsystem for transmitting torque through the special-shaped groove and the special-shaped through hole;
the two test-accompanying bearings are double-row self-aligning roller bearings;
the power subsystem comprises a motor, a motor base, a lead screw and a hand wheel, the motor is fixed on the motor base, the lead screw and the hand wheel are connected with the motor base and can drive the motor base to move along the axial direction of the mandrel, and the hand wheel is provided with a mechanical lock for fixing the position of the motor base;
the control circuit is connected with the motor, the temperature box, the electro-hydraulic oil cylinder, the displacement sensor and the temperature sensor through cables, the control circuit sends instructions to control the rotating speed, the steering speed and the operating time of the motor, the temperature value, the temperature change speed and the heat preservation time of the temperature box and the output load of the electro-hydraulic oil cylinder, and meanwhile, the control circuit monitors and records the displacement value and the temperature value acquired by the displacement sensor and the temperature sensor in real time.
2. The knuckle bearing low temperature wear test system of claim 1, wherein the fixture subsystem further comprises a bushing, the bushing being a cylindrical hollow tube, an inner ring of the bushing being in clearance fit with the outer surface of the mandrel.
3. The low-temperature wear test system for the joint bearing according to claim 1, wherein a sliding groove is formed in the base, the test accompanying bearing seats are fixedly mounted on the sliding groove, and the relative distance between the two test accompanying bearing seats can be adjusted along the sliding groove.
4. The knuckle bearing low temperature wear test system of claim 1, wherein the power subsystem further comprises a coupling.
5. The low-temperature wear test system for the joint bearing of claim 1, wherein the power subsystem further comprises a box penetrating shaft, the box penetrating shaft is connected with the mandrel through a side hole of the temperature box, a sealing component is arranged between an outer ring of the box penetrating shaft and the side hole of the temperature box, and the outer ring of the box penetrating shaft and the sealing component are in clearance fit.
6. A method for assembling a low-temperature wear test system for a joint bearing according to any one of claims 1 to 5, comprising the steps of:
step 1, placing the power subsystem at a preset position, and enabling a shaft for transmitting torque of the power subsystem to penetrate through a side hole of the temperature box;
step 2, forming an accompanying bearing assembly: respectively installing the two test-accompanying bearings into inner holes of the two test-accompanying bearing seats, and locking the test-accompanying bearings by using the end covers;
step 3, assembling a test bearing assembly: the two ejector blocks, the knuckle bearing to be tested and the loading plate penetrate through the mandrel, the two ejector blocks and the knuckle bearing to be tested are locked by the locking device, and the mandrel is connected with a motor shaft of the motor;
step 4, adjusting the distance position between the test bearing seats, respectively penetrating the two jacking blocks of the test bearing assembly through the central holes of the test bearing assemblies, fixedly connecting the loading plate with the stress subsystem, and then fixedly installing the test bearing seats on the base;
step 5, checking the whole shaft system to ensure the centering, and then slightly rotating the inner ring of the tested knuckle bearing to ensure that the tested knuckle bearing is not subjected to lateral force;
step 6, checking the temperature control subsystem, and enabling the abrasion measurement subsystem to work normally; and
and 7, starting the temperature box, controlling the stress subsystem to apply a specified load value to the knuckle bearing to be tested through the loading plate after the environmental temperature in the temperature box is adjusted to reach a specified temperature value, and controlling the power subsystem to periodically swing back and forth according to parameter requirements in a verification test outline until the specified test times are reached.
7. The method for assembling a knuckle bearing low temperature wear test system according to claim 6, further comprising step 8 for disassembly, wherein step 8 comprises the following steps:
step 81, after the low-temperature abrasion test is finished, unloading the radial force of the knuckle bearing to be tested, adjusting the environmental temperature in the temperature box to recover the room temperature, and then opening the temperature box;
step 82, disconnecting the connection between the mandrel and a motor shaft of the motor;
step 83, detaching the test-accompanying bearing seat from the base, taking out the left test-accompanying bearing assembly, and then taking out the test bearing assembly; and
and 84, unscrewing the locking component, and sequentially taking down the left ejector block, the loading plate, the tested knuckle bearing and the right ejector block from the mandrel to finish disassembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910652974.0A CN110243602B (en) | 2019-07-19 | 2019-07-19 | Low-temperature wear test system for joint bearing and assembling method thereof |
Applications Claiming Priority (1)
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| CN110749441B (en) * | 2019-11-11 | 2020-12-29 | 清华大学 | Low-temperature large-temperature variable joint bearing test platform and motion and load simulation system |
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| CN114076677A (en) * | 2021-11-29 | 2022-02-22 | 中国航发哈尔滨轴承有限公司 | Bearing tester shafting structure |
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