CN115597854B - Inner curve hydraulic motor roller-plunger friction pair testing device and testing method - Google Patents
Inner curve hydraulic motor roller-plunger friction pair testing device and testing method Download PDFInfo
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- CN115597854B CN115597854B CN202211603028.5A CN202211603028A CN115597854B CN 115597854 B CN115597854 B CN 115597854B CN 202211603028 A CN202211603028 A CN 202211603028A CN 115597854 B CN115597854 B CN 115597854B
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- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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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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Abstract
The invention discloses a testing device and a testing method for a roller-plunger friction pair of an inner curve hydraulic motor.A cylinder body is arranged on a cylinder body base, a plunger assembly to be tested is arranged on the cylinder body, and the pressure angle between a roller and a driving roller shaft can be changed by adjusting the positions of the cylinder body and the cylinder body base; the balance support seat is used for balancing the force of the plunger assembly acting on the driving roller shaft; the balance supporting seat fixing block limits and adjusts the position of the balance supporting seat; the driving motor drives the driving roll shaft to rotate so as to drive the roller to rotate; the working state of the plunger assembly under different working parameters of the motor can be simulated by changing the pressure angle, the hydraulic oil pressure in the plunger hole, the temperature and the rotating speed of the motor; the friction coefficient change of the roller-plunger friction pair can be monitored through a torque sensor; the invention can carry out the friction wear test on a single plunger inside the motor, and the plunger component to be tested is simple to install, low in test cost and short in test period.
Description
Technical Field
The invention belongs to the technical field of friction pair testing of hydraulic elements, and particularly relates to a testing device and a testing method for an inner curve hydraulic motor roller-plunger friction pair.
Background
The inner curve hydraulic motor is a low-speed and large-torque hydraulic motor and is widely applied to engineering machinery, agricultural machinery, hoisting machinery, mining machinery, construction machinery, military machinery and the like. The plunger assembly is one of core parts for ensuring the normal work of the motor. In the rotation process of the motor, the rollers in the plunger assembly generate sliding friction on the inner side surface of the plunger and bear and transmit larger hydraulic pressure acting on the plunger, and because the rotating speed of the motor is lower, a dynamic pressure lubricating oil film is difficult to establish between the roller and the plunger friction pair, the friction pair is often in a mixed lubrication state or even a boundary lubrication state under the action of larger hydraulic pressure, and further the abrasion failure of the rollers and the plunger is caused. The test is used as an important link of failure analysis, optimization improvement and quality inspection of parts, the plunger assembly is arranged in a complete motor by the currently adopted means, the motor is disassembled and the abrasion condition of the parts is observed after the motor runs for a period of time, the method is time-consuming and labor-consuming and high in test cost, and the working state of the roller-plunger pair cannot be monitored in real time, so that the design of the simulated measurement test device of the roller-plunger friction pair has important significance for improving the performance of the motor.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a device and a method for testing an inner curve hydraulic motor roller-plunger friction pair.
The purpose of the invention is realized by the following technical scheme: an inner curve hydraulic motor roller-plunger friction pair testing device, comprising: the device comprises a flat plate, a balance supporting seat, a driving roll shaft, a cylinder body base, a rack, a rotating speed and torque sensor and a driving motor;
the flat plate is fixed on the rack, the driving motor, the rotating speed torque sensor and the driving roll shaft are sequentially and coaxially connected, the driving roll shaft penetrates through the flat plate, and the sliding speed and the friction torque of the roller-plunger friction pair are obtained through calculation by combining data acquired by the rotating speed torque sensor;
the cylinder body base is arranged on the flat plate and is adjustable in position, the cylinder body is arranged on the cylinder body base and is adjustable in position, a cylindrical plunger hole is formed in the cylinder body and is used for installing a plunger assembly comprising a roller-plunger friction pair, and the length of the plunger assembly in the cylinder body is adjustable;
the balance supporting seat is arranged on the flat plate and is adjustable in position, and the balance supporting seat consists of a roller bracket and two rollers; the two rollers are arranged on the roller bracket, both the two rollers are in contact with the driving roller shaft, and the central axes of the driving roller shaft and the two rollers are parallel to each other; the driving roll shaft drives the two rollers and the rollers in the plunger assembly to rotate; the rotating speed of the driving roll shaft, the pressure angle between the driving roll shaft and the plunger assembly and the acting force between the driving roll shaft and the plunger assembly can be adjusted.
Further, the plunger assembly comprises a roller and a plunger, the central axis of the roller is perpendicular to the central axis of the plunger, the roller can rotate in the inner cylindrical surface of the plunger, and the sliding positions of the roller and the plunger form a roller-plunger friction pair to be tested.
Furthermore, the cylinder body base is installed on the flat plate through a fixing bolt, after the fixing bolt of the cylinder body base is unscrewed, the cylinder body base can slide back and forth on the flat plate to adjust a pressure angle between the driving roll shaft and the plunger assembly, and after the position adjustment of the cylinder body base is completed, the fixing bolt of the cylinder body base is screwed down to fix the cylinder body base on the flat plate.
Furthermore, the cylinder body is installed on the cylinder body base through fixing screws, after the cylinder body fixing screws are unscrewed, the cylinder body can slide left and right on the cylinder body base to adjust the length of the plunger assembly in the cylinder body, and after the position adjustment of the cylinder body is completed, the fixing screws of the cylinder body are screwed down to fix the cylinder body on the cylinder body base.
Further, the pressure angle between the driving roller shaft and the plunger assembly is an acute angle between a connecting line of the roller center in the plunger assembly and the driving roller shaft center and the plunger central axis in the plunger assembly; the position adjustment of cylinder body base should guarantee that the ray at the center of the central drive roll axle of roller passes the contained angle at two gyro wheel centers and drive roll axle centers among the plunger subassembly, guarantees promptly that the power that the plunger subassembly acted on drive roll axle is located between two gyro wheels, and balanced supporting seat plays the power balancing act this moment for the power that balanced plunger subassembly acted on drive roll axle.
Furthermore, a temperature sensor, a pressure sensor and a hydraulic oil pipe joint are installed on the cylinder body, and installing ports of the temperature sensor, the pressure sensor and the hydraulic oil pipe joint are communicated with the plunger hole and used for recording the change of the temperature and the pressure in the plunger hole.
Further, testing arrangement still includes balanced supporting seat fixed block, balanced supporting seat fixed block demountable installation is dull and stereotyped for the removal of restriction balanced supporting seat on the flat board, and two gyro wheels through adjusting screw on the balanced supporting seat fixed block in with balanced supporting seat press on the driving roller axle, guarantee two gyro wheels and driving roller axle's contact.
The invention also provides a test method based on the inner curve hydraulic motor roller-plunger friction pair test device, which specifically comprises the following steps:
(1) Installing a plunger assembly containing a roller-plunger friction pair in a plunger hole of a cylinder body, and enabling a roller in the plunger assembly to be in contact with a driving roller shaft, wherein the axis of the roller is parallel to the driving roller shaft;
(2) Loosening the fixing bolt of the cylinder body base, adjusting the position of the cylinder body base on the flat plate back and forth to enable the pressure angle between the driving roll shaft and the plunger assembly to be a required value, and after adjustment is completed, tightening the fixing bolt of the cylinder body base to fix the cylinder body base on the flat plate;
(3) Loosening a fixing screw of the cylinder body, adjusting the position of the cylinder body left and right to change the length of the plunger in the plunger hole, and after the adjustment is finished, screwing the fixing screw of the cylinder body to fix the cylinder body on the cylinder body base;
(4) Adjusting screws on the fixed blocks of the balance supporting seats to enable the two rollers of the balance supporting seats to be pressed on the driving roller shafts;
(5) Adjusting the rotating speed of the driving motor and changing the rotating speed of the roller in the plunger assembly; supplying hydraulic oil with required pressure and temperature to the plunger hole through the hydraulic oil pipe joint;
(6) Measuring by a temperature sensor and a pressure sensor to obtain a pressure curve and a temperature curve in the plunger cavity; measuring by a rotating speed torque sensor to obtain a change curve of the sliding speed and the friction torque of the roller-plunger friction pair in the test process; and observing the abrasion condition of the roller-plunger friction pair after the test through a microscope.
The invention has the advantages that: the inner curve hydraulic motor roller-plunger friction pair testing device provided by the invention can adjust the pressure angle and the roller rotating speed in the plunger assembly, and can test the friction torque and the abrasion condition of an inner roller-plunger friction pair when the motor works at different pressures, rotating speeds and oil temperatures by matching with hydraulic oil with certain pressure and temperature input by a hydraulic system; secondly, the testing device provided by the invention only tests a single plunger assembly, and has lower power, low testing cost and short testing period compared with the direct testing of the inner curve hydraulic motor with more than 10 plunger assemblies; in addition, the balance support seat can ensure the force balance of the driving roll shaft and prolong the service life of the driving roll shaft.
Drawings
FIG. 1 is an isometric view of an inner curve hydraulic motor roller-plunger friction pair testing device.
FIG. 2 is a top view of the inner curve hydraulic motor roller-plunger friction pair testing device.
Fig. 3 is a cross-sectional view taken along line D-D in fig. 2.
FIG. 4 is a schematic view of a plunger assembly to be tested.
Fig. 5 is an isometric view of the balance support.
The symbols in the drawings are: the test device comprises a 1-flat plate, a 2-balance support seat fixing block, a 2 a-adjusting screw, a 3-balance support seat, a 3 a-roller, a 3 b-roller support frame, a 4-driving roller shaft, a 5-plunger assembly to be tested, a 5 a-roller, a 5 b-plunger, a 6-temperature sensor, a 7-pressure sensor, an 8-cylinder body, an 8 a-cylinder body fixing screw, a 9-cylinder body base, a 9 a-cylinder body base fixing bolt, a 9 b-T-shaped nut, a 9 c-key, a 10-rack, a 11-rotating speed torque sensor, a 12-driving motor and a 13-hydraulic oil pipe joint.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention, the present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the testing device for the roller-plunger friction pair of the inner curve hydraulic motor provided by the invention comprises: the device comprises a flat plate 1, a balance supporting seat fixing block 2, a balance supporting seat 3, a driving roll shaft 4, a temperature sensor 6, a pressure sensor 7, a cylinder body 8, a cylinder body base 9, a rack 10, a rotating speed torque sensor 11, a driving motor 12 and a hydraulic oil pipe joint;
the flat plate 1 is fixed on a rack 10, a driving motor 12, a rotating speed and torque sensor 11 and a driving roll shaft 4 are sequentially and coaxially connected, and the driving roll shaft 4 penetrates through the flat plate 1.
As shown in fig. 2 and 3, a T-shaped groove is formed in the flat plate 1, the cylinder base 9 is located above the flat plate 1 and can slide back and forth along the T-shaped groove, a key 9c is installed below the cylinder base 9, and the key 9c is located in the T-shaped groove and guides the cylinder base 9 to move along the T-shaped groove; t type nut 9b is located T type inslot, and the position control of cylinder body base 9 is fixed on dull and stereotyped 1 through the fixing bolt 9a and the T type nut 9b of cylinder body base after accomplishing.
As shown in fig. 2, 3 and 4, a cylinder 8 is mounted on the cylinder base 9, a cylindrical plunger hole is drilled on the cylinder 8 for mounting a plunger assembly 5 to be tested, which includes a roller-plunger friction pair, the cylinder 8 can move on the cylinder base 9 along the axial direction of the cylinder hole, and the cylinder 8 is fixed on the cylinder base 9 by a fixing screw 8a of the cylinder after the position of the cylinder 8 is adjusted;
as shown in fig. 4, the plunger assembly 5 comprises a roller 5a and a plunger 5b, the central axis of the roller 5a is perpendicular to the central axis of the plunger 5b, the roller 5a can rotate in the inner cylindrical surface of the plunger 5b, and the position where the roller 5a and the plunger 5b slide relatively is the roller-plunger friction pair to be tested.
As shown in fig. 1 and 3, a temperature sensor 6, a pressure sensor 7 and a hydraulic oil pipe joint 13 are mounted on the cylinder 8, and mounting ports of the three are all communicated with the plunger hole.
As shown in fig. 2 and 5, the balance supporting seat 3 is composed of a roller bracket 3b and two rollers 3 a; the two rollers 3a are arranged on the roller bracket 3 b; the balance support seat 3 is positioned on the flat plate 1, is clamped by a balance support seat fixing block and is limited to move on the flat plate 1 by a driving roll shaft 4 and the balance support seat fixing block 2; the two rollers 3a are in contact with the driving roller shaft 4, and the central axes of the driving roller shaft 4 and the two rollers 3a are parallel to each other; the driving roller shaft 4 can drive the two rollers 3a and the roller 5a in the plunger assembly to rotate; the balance support seat 3 is used for balancing the force of the plunger assembly 5 acting on the driving roller shaft 4.
As shown in fig. 1, the balance support block fixing block 2 is detachably fixed on the flat plate 1, the balance support block fixing block 2 is provided with a groove, the balance support block 3 is provided with a corresponding protrusion, the protrusion of the balance support block 3 extends into the groove on the balance support block fixing block 2 to limit the movement of the balance support block 3 on the flat plate 1, and two rollers 2a in the balance support block 3 are pressed on the driving roller shaft 4 through adjusting screws 2a on the balance support block 3 fixing block, so that the contact between the two rollers 2a and the driving roller shaft 4 is ensured.
Corresponding to the embodiment of the inner curve hydraulic motor roller-plunger friction pair testing device, the invention also provides a testing method of the inner curve hydraulic motor roller-plunger friction pair, which comprises the following specific steps:
(1) The plunger assembly 5 to be tested is installed in the plunger hole of the cylinder 8, and the rollers 5a are brought into contact with the drive roller shaft 4 while the axes of the rollers 5a are parallel to the drive roller shaft 4.
(2) The fixing bolt 9a of the cylinder base is unscrewed and slides back and forth to adjust the position of the cylinder base 9 on the flat plate 1 for changing the pressure angle between the driving roll shaft 4 and the roller 5a
After the adjustment is completed, the fixing bolt 9a of the cylinder base is tightened.
(3) And loosening the fixing screw 8a of the cylinder body, sliding left and right to adjust the position of the cylinder body 8, changing the length of the plunger 5b in the plunger hole, and tightening the fixing screw 8a of the cylinder body after the adjustment is completed.
(4) Adjusting screws 2a on the balance support seat fixing block 2 are adjusted, so that two idler wheels 3a of the balance support seat 3 are pressed on the driving roll shaft 4 in a pressure equalizing mode.
(5) The rotating speed of the driving motor 12 is adjusted, so that the rotating speed of the roller 5a is changed; hydraulic oil of a certain pressure and temperature is supplied to the plunger hole through a hydraulic oil pipe joint 13.
(6) The length and pressure angle of the plunger 5b in the plunger hole are completed by the operations (1) to (5) described above
Setting five parameters of the rotating speed of the roller 5a, the hydraulic pressure in the plunger hole and the temperature; through the adjustment of the five parameters, the roller-plunger friction pair in the motor can be tested when the motor works at different pressures, rotating speeds and oil temperatures; monitoring the pressure and temperature in the plunger hole through a temperature sensor 6 and a pressure sensor 7; obtaining a change curve of friction torque and sliding speed of the roller-plunger friction pair in the test process through the rotating speed torque sensor 11, and observing the abrasion condition of the roller-plunger friction pair after the test is finished through a microscope;
as shown in fig. 2, the pressure angle
Is an acute angle between the connecting line of the center C of the roller 5a and the center o of the driving roller shaft 4 and the central axis of the plunger; the position of the cylinder base 9 is adjusted to ensure the position of the roller 5aThe ray from the center C to the center o of the driving roller shaft 4 passes through an acute angle AoB between the centers (A and B) of the two rollers 3a and the center o of the driving roller shaft 4, namely, the force of the plunger 5B assembly 5 acting on the driving roller shaft 4 is ensured to be positioned between the two rollers, and the balance support seat 3 can play a role in force balance at the moment.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A roller-plunger friction pair testing device for an inner curve hydraulic motor is characterized by comprising: the device comprises a flat plate, a balance supporting seat, a driving roll shaft, a cylinder body base, a rack, a rotating speed and torque sensor and a driving motor;
the flat plate is fixed on the rack, the driving motor, the rotating speed torque sensor and the driving roll shaft are sequentially and coaxially connected, the driving roll shaft penetrates through the flat plate, and the sliding speed and the friction torque of the roller-plunger friction pair are obtained through calculation by combining data collected by the rotating speed torque sensor;
the cylinder body base is arranged on the flat plate and is adjustable in position, the cylinder body is arranged on the cylinder body base and is adjustable in position, a cylindrical plunger hole is formed in the cylinder body and is used for installing a plunger assembly comprising a roller-plunger friction pair, and the length of the plunger assembly in the cylinder body is adjustable;
the balance supporting seat is arranged on the flat plate and is adjustable in position, and the balance supporting seat consists of a roller bracket and two rollers; the two rollers are arranged on the roller bracket, both the two rollers are in contact with the driving roller shaft, and the central axes of the driving roller shaft and the two rollers are parallel to each other; the driving roll shaft drives the rollers in the two idler wheels and the plunger assembly to rotate; the rotating speed of the driving roll shaft, the pressure angle between the driving roll shaft and the plunger assembly and the acting force between the driving roll shaft and the plunger assembly can be adjusted.
2. The device for testing inner curve hydraulic motor roller-plunger friction pairs as claimed in claim 1, wherein the plunger assembly comprises a roller and a plunger, the central axis of the roller is perpendicular to the central axis of the plunger, the roller can rotate in the inner cylindrical surface of the plunger, and the sliding position of the roller and the plunger relative to each other constitutes the roller-plunger friction pair to be tested.
3. The inner curve hydraulic motor roller-plunger friction pair testing device as claimed in claim 1, wherein the cylinder base is mounted on the plate by means of fixing bolts, the cylinder base can slide back and forth on the plate to adjust the pressure angle between the driving roller shaft and the plunger assembly after the fixing bolts of the cylinder base are loosened, and the cylinder base is fixed on the plate by tightening the fixing bolts of the cylinder base after the position adjustment of the cylinder base is completed.
4. The inner curve hydraulic motor roller-plunger friction pair testing device as claimed in claim 1, wherein the cylinder is mounted on the cylinder base through fixing screws, after the cylinder fixing screws are unscrewed, the cylinder can slide left and right on the cylinder base to adjust the length of the plunger assembly in the cylinder, and after the cylinder position is adjusted, the cylinder is fixed on the cylinder base through tightening the fixing screws of the cylinder.
5. The inner curve hydraulic motor roller-plunger friction pair testing device as claimed in claim 1, wherein the pressure angle between the driving roller shaft and the plunger assembly is an acute angle between the connecting line of the roller center in the plunger assembly and the driving roller shaft center and the plunger central axis in the plunger assembly; the position adjustment of cylinder body base should guarantee that the center of roller passes the contained angle at two gyro wheel centers and drive roller axle centers to the ray at drive roller axle center in the plunger subassembly, guarantees promptly that the plunger subassembly acts on between two gyro wheels the power of drive roller axle, and balanced supporting seat plays power balance effect this moment for the power of balanced plunger subassembly effect on drive roller axle.
6. The inner curve hydraulic motor roller-plunger friction pair testing device as claimed in claim 1, wherein the cylinder block is provided with a temperature sensor, a pressure sensor and a hydraulic oil pipe joint, and mounting ports of the temperature sensor, the pressure sensor and the hydraulic oil pipe joint are communicated with the plunger hole and used for recording temperature and pressure changes in the plunger hole.
7. The inner curve hydraulic motor roller-plunger friction pair testing device as claimed in claim 1, wherein the testing device further comprises a balance support fixing block detachably mounted on the plate for limiting the movement of the balance support on the plate, and the two rollers of the balance support are pressed against the driving roller shaft by the adjusting screw on the balance support fixing block, so as to ensure the contact between the two rollers and the driving roller shaft.
8. A test method based on the inner curve hydraulic motor roller-plunger friction pair test device of any one of claims 1-7 is characterized by comprising the following steps:
(1) Installing a plunger assembly containing a roller-plunger friction pair in a plunger hole of a cylinder body, and enabling a roller in the plunger assembly to be in contact with a driving roller shaft, wherein the axis of the roller is parallel to the driving roller shaft;
(2) Loosening the fixing bolt of the cylinder body base, adjusting the position of the cylinder body base on the flat plate back and forth to enable the pressure angle between the driving roll shaft and the plunger assembly to be a required value, and after adjustment is completed, tightening the fixing bolt of the cylinder body base to fix the cylinder body base on the flat plate;
(3) Loosening a fixing screw of the cylinder body, adjusting the position of the cylinder body left and right to change the length of the plunger in the plunger hole, and after the adjustment is finished, screwing the fixing screw of the cylinder body to fix the cylinder body on the cylinder body base;
(4) Adjusting screws on the balance supporting seat fixing blocks to enable the two rollers of the balance supporting seat to be pressed on the driving roller shaft;
(5) Adjusting the rotating speed of the driving motor and changing the rotating speed of the roller in the plunger assembly; supplying hydraulic oil with required pressure and temperature to the plunger hole through the hydraulic oil pipe joint;
(6) Measuring by a temperature sensor and a pressure sensor to obtain a pressure curve and a temperature curve in the plunger cavity; measuring by a rotating speed torque sensor to obtain a change curve of the sliding speed and the friction torque of the roller-plunger friction pair in the test process; and observing the abrasion condition of the roller-plunger friction pair after the test through a microscope.
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| CN202211603028.5A CN115597854B (en) | 2022-12-14 | 2022-12-14 | Inner curve hydraulic motor roller-plunger friction pair testing device and testing method |
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| CN115949653A (en) * | 2023-03-08 | 2023-04-11 | 浙江大学 | Friction pair test bed for plunger assembly of inner curve hydraulic motor |
| CN116398416B (en) * | 2023-03-28 | 2024-01-30 | 浙江大学 | Plunger pair performance simulation test device, temperature control system and hydraulic system |
| CN116151030B (en) * | 2023-04-14 | 2023-08-04 | 浙江大学 | Structure optimization method for low temperature rise of motor brake |
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