CN116793670A - Heavy-load planetary roller screw pair transmission efficiency measuring device and measuring method - Google Patents
Heavy-load planetary roller screw pair transmission efficiency measuring device and measuring method Download PDFInfo
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- CN116793670A CN116793670A CN202310743951.7A CN202310743951A CN116793670A CN 116793670 A CN116793670 A CN 116793670A CN 202310743951 A CN202310743951 A CN 202310743951A CN 116793670 A CN116793670 A CN 116793670A
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Abstract
The invention discloses a device and a method for measuring transmission efficiency of a heavy-duty planetary roller screw pair, wherein the device comprises the following steps: the device comprises a driving motor assembly, a bearing support, a roller screw module to be tested, a guide rail sliding block assembly, a loading tool, a hydraulic loading assembly, a device platform, a torque sensor, a tension pressure sensor and a linear grating displacement sensor. The driving motor assembly is arranged at the side of the device platform, the screw driving motor is connected with the torque sensor through an elastic coupling, the other end of the torque sensor is connected with the input end of the screw to be tested through a rigid coupling, the screw nut is connected with the tension pressure sensor through a force transmission shaft, and the tension pressure sensor is fixed on the loading block; the loading block is fixed with the hydraulic loading assembly through a joint bearing, the lower part of the loading block is arranged on the linear guide rail through a guide rail sliding block, and the linear grating is arranged on one side of the linear guide rail. The invention is used for testing the transmission efficiency of the planetary roller screw.
Description
Technical Field
The invention relates to the technical field of performance test of mechanical devices, in particular to a device and a method for measuring transmission efficiency of a heavy-duty planetary roller screw pair.
Background
Planetary roller screws are a common transmission element and are widely applied to the field of industrial machinery. The device has the advantages of high transmission efficiency, high precision, small reverse clearance and the like, and is widely applied to the fields of numerical control machine tools, automation equipment, aerospace vehicles and the like. The transmission efficiency of the motor is often greatly different, and accurate measurement is difficult. Through measurement and analysis of transmission efficiency, the performance of the planetary roller screw can be evaluated, the structural design and process improvement of the planetary roller screw are guided, and the transmission efficiency and the service life of the planetary roller screw are improved. At present, the transmission efficiency testing method mainly comprises theoretical analysis, simulation and experiment testing and the like. The experimental test is the most direct and accurate method, and the actual transmission efficiency of the planetary roller screw can be obtained, but the testing difficulty is high, and the influence of various factors such as testing environment, measuring instrument, data processing and the like needs to be considered. Therefore, the method has great significance for research and exploration of the planetary roller screw transmission efficiency test, and can provide scientific basis for application and optimization of the planetary roller screw.
Disclosure of Invention
Aiming at the defects and the demands, the invention provides a device and a method for measuring the transmission efficiency of a heavy-duty planetary roller screw pair. The method aims to realize the transmission efficiency measurement of the heavy-duty planetary ball screw and reduce the measurement error of the efficiency measurement.
The utility model provides a heavy load planet roller screw pair transmission efficiency measuring device, includes driving motor subassembly, bearing support, roller screw module that awaits measuring, guide rail slider subassembly, loading frock, hydraulic loading subassembly, device platform, torque sensor, tension pressure sensor, linear grating displacement sensor, bearing friction loss test module.
The driving motor assembly is arranged on the side face of the device platform, and the motor output shaft is installed on the same axis with the torque sensor through an elastic coupling.
The bearing support is fixed on the device platform, the roller screw module to be tested is fixed on the bearing support, and the input end of the screw is connected with the torque sensor through the rigid coupling.
The bearing friction loss testing module can replace a roller screw module to be tested to be installed on the bearing seat.
The guide rail sliding block assembly is fixed on the device platform, and the sliding block is fixed with the bottom of the loading tool (5) and used for being connected with the hydraulic loading assembly.
The hydraulic loading assembly is arranged on the device platform, and the output end of the hydraulic cylinder is connected with the loading tool through a joint bearing.
One end of the torque sensor is connected with an output shaft of the screw driving motor through a flexible coupler, and the other end of the torque sensor is connected with an input end of the screw through a rigid coupler.
The tension and pressure sensor is fixed on the loading tool and is arranged on the same axis of the screw rod.
The linear grating displacement sensor is arranged on a vertical mounting surface of the device platform and is arranged in parallel with the guide rail, and the reading head is arranged below the loading tool through a connecting piece.
2. The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the driving motor assembly comprises a lifting platform, is guided by the combined vertical arrangement of a guide rail and a screw, and is driven by a servo motor. The screw driving motor is fixed on the lifting platform through the motor support.
3. The device and the method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1 are characterized in that the loading tool comprises a dowel bar and a loading support. The dowel bar adopts a double-hinge structure to release the unbalanced load force.
4. The device and the method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1 are characterized in that the hydraulic loading assembly is driven by double hydraulic cylinders, and an output rod of each hydraulic cylinder is connected with the loading support through a joint bearing.
5. The device and the method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1 are characterized in that the bearing friction loss testing module comprises a screw replacing shaft, an angular contact ball bearing, an actuator cylinder end cover and a bearing loading connector.
The inner ring of the angular contact ball bearing is positioned through a screw rod replacing shaft, the outer ring is positioned through an inner ring of the actuator cylinder, the inner ring of the angular contact ball bearing at the other end is positioned through the screw rod replacing shaft, the outer ring is contacted with a bearing loading joint, the bearing loading joint is installed with an end cover of the actuator cylinder in a clearance fit manner, and the end cover of the actuator cylinder is fixed on the actuator cylinder through a screw.
6. The device and the method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1 are characterized in that the roller screw module to be measured comprises an actuator cylinder, an angular contact ball bearing, a screw nut, a sliding copper sleeve, a copper sleeve positioning sleeve and an actuator cylinder end cover. The double-angle contact ball bearing is arranged back to back, the outer ring is positioned by the inner ring of the actuator cylinder, the inner ring is positioned by the shaft shoulder of the screw rod, one end of the screw rod nut is assembled with a sliding copper sleeve, a sliding copper sleeve at the extending end of the nut is positioned by a copper sleeve positioning sleeve and an end cover of the actuator cylinder, and the end cover of the actuator cylinder is fixed on the actuator cylinder by screws.
Compared with the prior art, the invention has the beneficial effects that:
the driving motor component and the device platform are not in rigid contact, so that the influence of vibration generated during the operation of the driving motor on a measurement result can be effectively reduced, and the measurement precision is improved.
The invention adopts a modularized design mode, and can detach and install the whole module when the bearing friction torque is measured, so that the operation is simple and the reliability is high.
The efficiency testing method considers the friction loss of the rolling bearing and the sliding bearing, measures both the friction loss and the friction loss, and improves the testing precision of the transmission efficiency test.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a front view of FIG. 1
FIG. 3 is a schematic diagram of a bearing friction loss testing module according to the present invention
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiments of the invention are further described below with reference to the accompanying drawings:
1. the device and the method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair are characterized by comprising a driving motor assembly 1, a bearing support 2, a roller screw module to be measured 3, a guide rail sliding block assembly 4, a loading tool 5, a hydraulic loading assembly 6, a device platform (7), a torque sensor 8, a tension pressure sensor 9 and a linear grating displacement sensor 10.
The driving motor component 1 is arranged on the side face of the device platform 7, and the motor output shaft is arranged on the same axis with the torque sensor 8 through an elastic coupling.
The bearing support 2 is fixed on the device platform 7, the roller screw module (3) to be tested is fixed on the bearing support 2, and the input end of the screw is connected with the torque sensor 8 through a rigid coupling.
The efficiency testing module can replace the roller screw module to be tested to be installed on the bearing seat.
The guide rail sliding block assembly 4 is fixed on the device platform 7, and the sliding block is fixed with the bottom of the loading tool 5 and is used for being connected with the hydraulic loading assembly 6.
The hydraulic loading assembly 6 is arranged on the device platform 7, and the output end of the hydraulic cylinder is connected with the loading tool 5 through a joint bearing.
One end of the torque sensor 8 is connected with an output shaft of the screw driving motor through a flexible coupling, and the other end of the torque sensor is connected with an input end of the screw through a rigid coupling.
The tension and pressure sensor 9 is fixed on the loading tool 5 and is arranged on the same axis of the screw rod.
The linear grating displacement sensor 10 is arranged on a vertical installation surface of the device platform 7 and is arranged in parallel with the guide rail, and the reading head is arranged below the loading tool 5 through a connecting piece.
7. The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the driving motor assembly 1 comprises a lifting platform 11, is guided by a combination of a guide rail and a screw in a vertical arrangement, and is driven by a servo motor. The screw driving motor 12 is fixed on the lifting platform 11 through a motor support.
8. The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the loading tool 5 comprises a dowel bar 51 and a loading support 52. The dowel bar adopts a double-hinge structure to release the unbalanced load force.
9. The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the hydraulic loading assembly is driven by a double hydraulic cylinder, and an output rod of the hydraulic cylinder is connected with the loading support 52 through a joint bearing.
10. The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the bearing friction loss testing module comprises a screw replacing shaft 53, an angular contact ball bearing 55, an actuator cylinder 54, an actuator cylinder end cover 56 and a bearing loading joint 57.
The inner ring of the angular contact ball bearing 55 is positioned through the screw rod replacing shaft 53, the outer ring is positioned through the inner ring of the actuator cylinder 54, the inner ring of the angular contact ball bearing 55 at the other end is positioned through the screw rod replacing shaft 53, the outer ring is contacted with the bearing loading joint 57, the bearing loading joint 57 is installed with the actuator cylinder end cover 56 in a clearance fit manner, and the actuator cylinder end cover 56 is fixed on the actuator cylinder 54 through screws.
The device and method for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the roller screw module to be measured comprises an actuator cylinder 13, an angular contact ball bearing 14, a screw rod 15, a screw rod nut 17, a sliding copper sleeve 16, a copper sleeve positioning sleeve 18 and an actuator cylinder end cover 19. The actuator cylinder 13 is fixed on the bearing support 2 through screws, the double-angle contact ball bearing 14 is arranged back to back, the outer ring is positioned by the inner ring of the actuator cylinder 13, the inner ring is positioned by the shaft shoulder of the lead screw 15, one end of the lead screw nut 17 is assembled with a sliding copper sleeve 16, the extending end of the nut is positioned with the actuator cylinder end cover 19 through a copper sleeve positioning sleeve 18, and the actuator cylinder end cover 19 is fixed on the actuator cylinder 13 through screws.
The embodiment of the invention also provides a hull weld defect detection and identification method, which comprises the following steps:
1) And installing the screw rod assembly to be tested on an experimental device, preparing before testing, and controlling the hydraulic loading assembly to slowly load until the data of the tension pressure sensor reach the required load F.
2) And controlling the screw rod driving motor to slowly rotate at a constant speed for a designated number of turns n, stopping, and recording the running time of the motor. And recording torque sensor data in the running process of the screw to be tested, calculating driving torque M and displacement data L of the screw nut end movement by adopting an arithmetic average method, and calculating the average speed v of the screw nut movement by using the displacement data and the time data.
3) And disassembling a lead screw in the lead screw assembly to be tested, controlling the hydraulic loading assembly to move at a constant speed v for a certain distance, recording the data of the tension pressure sensor, and obtaining the friction force f of the lead screw nut and the sliding copper sleeve and the running time t of the driving motor by calculating the arithmetic average value of the force data.
4) And disassembling the screw rod assembly to be tested, installing the efficiency testing assembly, and controlling the hydraulic loading assembly to slowly load until the data of the tension pressure sensor reach the required load F after the installation is completed.
5) And controlling the screw driving motor to rotate at the same speed for a designated number of turns n, recording torque sensor data and calculating the friction moment m of the rolling bearing by an arithmetic average method.
The screw drive efficiency is calculated from a screw drive efficiency calculation formula. The transmission efficiency is calculated according to the ratio of the output power to the input power. For a planetary roller screw, the input of the planetary roller screw is torque for driving the screw to rotate by a motor, and the input power is the product of the driving torque and the angular speed of the screw; the output is the linear motion of the nut, and the output power is the product of the axial load of the nut and the linear motion speed of the nut. The planetary roller screw transmission efficiency calculation formula can be deduced as follows:
wherein: f is the axial load of the nut, M is the torque measured by the torque sensor, M is the resistance moment of the test device, v is the moving speed of the nut, and F is the friction force of the sliding bearing.
Claims (6)
1. The device for measuring the transmission efficiency of the heavy-duty planetary roller screw pair is characterized by comprising a driving motor assembly (1), a bearing support (2), a roller screw module to be measured (3), a guide rail sliding block assembly (4), a loading tool (5), a hydraulic loading assembly (6), a device platform (7), a torque sensor (8), a tension pressure sensor (9), a linear grating displacement sensor (10) and a bearing friction loss testing module;
the driving motor assembly (1) is arranged on the side surface of the device platform (7), and a motor output shaft of the driving motor assembly (1) is coaxially arranged with the torque sensor (8) through an elastic coupling;
the bearing support (2) is fixed on the device platform (7), the roller screw module (3) to be tested is fixed on the bearing support (2), and the screw input end of the roller screw module (3) to be tested is connected with the torque sensor (8) through a rigid coupling;
the bearing friction loss testing module is arranged on the bearing support (2) in a mode of replacing the roller screw module (3) to be tested; during installation, a screw rod replacement shaft (53) of the bearing friction loss testing module is fixedly connected with the torque sensor (8) through a flexible coupling, and a bearing loading joint (57) is fixedly connected with the dowel bar (51) through threads; the testing device is used for testing efficiency loss caused by bearing friction heat generation when the roller screw to be tested works;
the bearing friction loss testing module comprises a screw replacing shaft (53), angular contact ball bearings (55), an actuating cylinder (54), an actuating cylinder end cover (56) and bearing loading connectors (57), wherein the angular contact ball bearings (55) are arranged on two sides of the screw replacing shaft (53), an inner ring is fixedly connected with the screw replacing shaft (53) through mechanical matching, an outer ring is fixedly connected with an inner ring of the actuating cylinder (54) through mechanical matching, outer rings of the two angular contact ball bearings are respectively positioned axially with the bearing loading connectors (57) through inner ring flanges of the actuating cylinder (54), the inner rings are positioned through shaft shoulders of the screw replacing shaft (53), the bearing loading connectors (57) are arranged with the actuating cylinder end cover (56) through clearance fit, and the actuating cylinder end cover (56) is fixed on the actuating cylinder (54) through screws;
the guide rail sliding block assembly (4) is fixed on the device platform (7), and a sliding block of the guide rail sliding block assembly (4) is fixed with the bottom of the loading tool (5) through bolts and is used for being connected with the hydraulic loading assembly (6);
the hydraulic loading assembly (6) is arranged on the device platform (7), and the output end of a hydraulic cylinder of the hydraulic loading assembly (6) is connected with the loading tool (5) through a joint bearing;
one end of the torque sensor (8) is connected with an output shaft of a screw driving motor (12) of the driving motor assembly (1) through a flexible coupling, and the other end of the torque sensor is connected with an input end of the screw through a rigid coupling and is used for collecting torque input to a roller screw module (3) to be tested and a bearing friction loss testing module;
the tension and pressure sensor (9) is fixed on the loading tool (5) and is arranged on the same axis of the screw rod and used for collecting tension and pressure loaded by the hydraulic loading assembly (6);
the linear grating displacement sensor (10) is arranged on a vertical mounting surface of the device platform (7) and is arranged in parallel with the guide rail, and the reading head is arranged below the loading tool (5) through a connecting piece and is used for collecting the displacement of the movement of a screw nut (17) of the roller screw module (3) to be tested;
the bearing friction loss testing module comprises a screw rod replacing shaft (53), an angular contact ball bearing (55), an actuator cylinder (54), an actuator cylinder end cover (56) and a bearing loading connector (57);
the inner ring of the angular contact ball bearing (55) is positioned through the screw rod replacing shaft (53), the outer ring of the angular contact ball bearing (55) is positioned through the inner ring of the actuator cylinder (54), the inner ring of the other end of the angular contact ball bearing (55) is positioned through the screw rod replacing shaft (53), the outer ring of the angular contact ball bearing is contacted with the bearing loading joint (57), the bearing loading joint (57) is installed with the actuator cylinder end cover (56) in a clearance fit mode, and the actuator cylinder end cover (56) is fixed on the actuator cylinder (54) through screws.
2. The device for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the driving motor assembly (1) comprises a lifting platform (11), is guided by the combination vertical arrangement of a guide rail and a screw, and is driven by a servo motor; the screw driving motor (12) is fixed on the lifting platform (11) through a motor support.
3. The device for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the loading tool (5) comprises a dowel bar (51) and a loading support (52); the dowel bar adopts a double-hinge structure to release the unbalanced load force.
4. The device for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the hydraulic loading assembly is driven by a double hydraulic cylinder, and an output rod of the hydraulic cylinder is connected with a loading support (52) through a joint bearing.
5. The device for measuring the transmission efficiency of the heavy-duty planetary roller screw pair according to claim 1, wherein the roller screw module to be measured comprises an actuator cylinder (13), an angular contact ball bearing (14), a screw (15), a screw nut (17), a sliding copper sleeve (16), a copper sleeve positioning sleeve (18) and an actuator cylinder end cover (19); the double-angle contact ball bearing (14) is arranged back to back, the outer ring is positioned by the inner ring of the actuator cylinder (13), the inner ring is positioned by the shaft shoulder of a screw rod (15), one end of a screw rod nut (17) is assembled with a sliding copper sleeve (16), a sliding copper sleeve (16) at the extending end of the nut is positioned with an actuator cylinder end cover (19) through a copper sleeve positioning sleeve (18), and the actuator cylinder end cover (19) is fixed on the actuator cylinder (13) through screws.
6. A measuring method based on the heavy-duty planetary roller screw pair transmission efficiency measuring device as set forth in any one of claims 1 to 5, characterized in that: the method comprises the following steps:
1) Firstly, a screw rod assembly to be tested is mounted on a bearing seat, preparation is carried out before testing, a hydraulic loading assembly is controlled to slowly load, and loading is stopped after the data of a tension pressure sensor reaches a set load F;
2) The screw driving motor is controlled to slowly rotate at a constant speed for a set number of turns and then stops, and torque sensor data M and displacement data L of the screw nut end movement in the running process of the screw to be tested are recorded;
3) The method comprises the steps of integrally disassembling a screw assembly to be tested, disassembling a screw in the assembly, reinstalling the rest parts to the original position, fixing a screw nut with a dowel bar through threads, controlling a hydraulic loading assembly to move at a constant speed for a certain distance, and recording data f of a tension pressure sensor;
4) Disassembling a screw rod assembly to be tested, installing a bearing friction loss testing module, and controlling a hydraulic loading assembly to slowly load until the data of a tension pressure sensor reach a required load F after the installation is finished;
5) Controlling a screw rod driving motor to rotate at the same speed, and recording torque sensor data m;
6) The screw drive efficiency is calculated from a screw drive efficiency calculation formula.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310743951.7A CN116793670A (en) | 2023-06-24 | 2023-06-24 | Heavy-load planetary roller screw pair transmission efficiency measuring device and measuring method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310743951.7A CN116793670A (en) | 2023-06-24 | 2023-06-24 | Heavy-load planetary roller screw pair transmission efficiency measuring device and measuring method |
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| Publication Number | Publication Date |
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| CN116793670A true CN116793670A (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310743951.7A Pending CN116793670A (en) | 2023-06-24 | 2023-06-24 | Heavy-load planetary roller screw pair transmission efficiency measuring device and measuring method |
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| CN (1) | CN116793670A (en) |
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- 2023-06-24 CN CN202310743951.7A patent/CN116793670A/en active Pending
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