CN112284660B - Bent torsion composite load test device of bent axle - Google Patents
Bent torsion composite load test device of bent axle Download PDFInfo
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- CN112284660B CN112284660B CN202011043114.6A CN202011043114A CN112284660B CN 112284660 B CN112284660 B CN 112284660B CN 202011043114 A CN202011043114 A CN 202011043114A CN 112284660 B CN112284660 B CN 112284660B
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- 238000012360 testing method Methods 0.000 title claims abstract description 43
- 239000002131 composite material Substances 0.000 title claims abstract description 12
- 238000005452 bending Methods 0.000 claims abstract description 66
- 238000010998 test method Methods 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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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
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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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
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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
- G01N3/02—Details
- G01N3/04—Chucks
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
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- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a crankshaft bending and twisting composite load test device. The device is supported by a rack, wherein a sliding rail, a lifting appliance, a bending clamp, a twisting clamp, a vibration exciter, a motor, an eccentric wheel and an electric control cabinet (comprising a power amplifier, a function generator and a dynamic strain gauge) are arranged in the rack. The device lifts the torsion clamp and the bending clamp through the lifting appliance and the sliding rail, fixes the crankshaft sample piece through the bending clamp and the torsion clamp so as to obtain a proper test position on the rack, drives the torsion clamp to apply pulsating torque to the crankshaft through the vibration rod of the vibration exciter, and drives the bending clamp to apply alternating bending moment to the crankshaft through the motor and the eccentric wheel. During testing, frequency and amplitude signals are set, a vibration exciter and a motor are driven to output through a signal generator and a power amplifier, the crankshaft is made to vibrate forcibly, output power is further adjusted after resonance is achieved, vibration frequency is changed, and the fatigue strength condition of the crankshaft is judged and analyzed through strain gauge data.
Description
Technical Field
The invention relates to a crankshaft bending and twisting composite load test device, in particular to a crankshaft bending and twisting composite load test device which can independently apply pulsating torque and alternating bending moment to a crankshaft at the same time and perform a crankshaft fatigue simulation test.
Background
At present, a known crankshaft bending and twisting test bed is formed by connecting a support rack, a lifting appliance, a bending clamp, a twisting clamp, a vibration exciter and an electric control cabinet. The vibration exciting signal generated by the vibration exciter drives the bending clamp and the torsion clamp by the vibrating rod to apply pulsating bending moment and torque to the crankshaft. However, in the actual stress state of the crankshaft, the torque is a pulsating load, the bending moment is an alternating load, and the alternating bending moment load cannot be generated only by a vibration exciter, and a general crankshaft bending and torsion test bed cannot simulate a load close to a real working condition, so that the result of a fatigue simulation test is not accurate enough, and further, the design and the check of the crankshaft are not enough, and the potential reliability hazard may be brought.
Disclosure of Invention
In order to overcome the defect that the existing crankshaft bending and twisting test bed can not apply alternating bending moment load, the invention provides the crankshaft bending and twisting composite load test device.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a crankshaft bending and twisting composite load test device comprises a rack, a lifting appliance, a twisting clamp, a vibration exciter, a sliding rail, a bending clamp, an eccentric wheel, a motor and an electric control cabinet; the stand is in a four-column shape and is provided with an upper platform and a lower platform, a slide rail for horizontal sliding is arranged on the lower surface of the upper platform, the electric control cabinet is positioned below the lower platform, and the vibration exciter and the motor are positioned above the lower platform; the vibration rod of the vibration exciter is vertically contacted with the torsion clamp, and the vibration exciter excites and knocks the torsion clamp to drive the torsion clamp to swing relative to the torsion direction of the crankshaft sample piece, so that a pulsating torque is applied to the crankshaft sample piece; the bending fixture is provided with a notch, an eccentric wheel is installed on the notch, the motor drives the eccentric wheel, and the eccentric motion of the eccentric wheel drives the bending fixture to swing relative to the bending direction of the crankshaft sample piece, so that reciprocating alternating bending moment is applied to the crankshaft sample piece.
The lifting appliance can slide on the slide rail to adjust the position of the crankshaft sample piece in the test, so that the crankshaft sample piece can freely vibrate in space; the relative positions of the vibration exciter and the motor on the platform under the stand can be adjusted according to the position, the shape and the size of the crankshaft sample piece.
The electric control cabinet comprises a power amplifier, a function generator and a dynamic strain gauge.
A test method of the crankshaft bending and twisting composite load test device comprises the following steps: arranging a lifting appliance on the slide rail, hanging a torsion clamp and a bending clamp in the center of the test device through the lifting appliance, fixing a crankshaft sample piece through the torsion clamp and the bending clamp, and adjusting the position of the lifting appliance on the slide rail and the hanging height to enable the crankshaft sample piece to obtain a proper test position; adjusting the positions of a vibration exciter and a motor on a lower platform of the rack according to the position of the crankshaft sample piece, so that the vibration exciter and the motor respectively apply loads to a torsion clamp and a bending clamp; and arranging the strain gauge sensor and the accelerometer sensor on the crankshaft sample piece, and supplying power, controlling and acquiring data to each circuit element through the electric control cabinet.
The invention has the advantages that the invention can simultaneously and independently apply torsional and bending loads, the applied torque is a pulsating load according to the motion characteristic of the vibration exciter, and the applied bending moment is an alternating load according to the motion characteristic of the eccentric wheel, which is more consistent with the actual stress condition of the crankshaft, thereby achieving the effect of simulating the actual stress condition of the crankshaft, ensuring that the result of the fatigue simulation test is more accurate and providing great help for the reliability design and the check of the crankshaft.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a schematic structural diagram of a motor, an eccentric wheel and a bending fixture in the crankshaft bending and torsion combined load testing device.
Fig. 3 is a schematic structural diagram of a vibration exciter, a vibration rod and a torsion clamp in the crankshaft bending and torsion combined load testing device.
In the figure, a rack 1, a lifting appliance 2, a torsion clamp 3, a crankshaft sample piece 4, a vibration exciter 5, a slide rail 6, a bending clamp 7, an eccentric wheel 8, a motor 9 and an electric control cabinet 10 are arranged.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
As shown in fig. 1, the test device of the invention comprises a rack 1, a hanger 2, a torsion clamp 3, a vibration exciter 5, a slide rail 6, a bending clamp 7, an eccentric wheel 8, a motor 9 and an electric control cabinet 10 (comprising a power amplifier, a function generator and a dynamic strain gauge); the stand 1 is in a four-column shape and is provided with an upper platform and a lower platform, a slide rail 6 for horizontal sliding is arranged on the lower surface of the upper platform, an electric control cabinet 10 is positioned below the lower platform, and a vibration exciter 5 and a motor 9 are positioned above the lower platform; a sliding block on a sliding rail 6 is connected with a lifting appliance 2, the lifting appliance 2 is used for hanging a torsion clamp 3 and a bending clamp 7, the torsion clamp 3 and the bending clamp 7 are used for fixing a crankshaft sample piece 4 and applying load to the crankshaft sample piece, a vibration rod of a vibration exciter 5 is vertically contacted with the torsion clamp 3, as shown in fig. 3, the vibration exciter 5 is used for exciting and knocking the torsion clamp 3 to drive the torsion clamp 3 to swing in a torsion direction relative to the crankshaft sample piece 4, and therefore pulsation torque is applied to the crankshaft sample piece 4; the bending fixture 7 is provided with a notch and is provided with an eccentric wheel 8, as shown in figure 2, a motor 9 drives the eccentric wheel 8, and the eccentric motion of the eccentric wheel 8 drives the bending fixture 7 to swing relative to the bending direction of the crankshaft sample piece 4, so that reciprocating alternating bending moment is applied to the crankshaft sample piece 4.
The lifting appliance 2 of the test device can slide on the slide rail 6 to adjust the position of the crankshaft sample piece 4 in the test, so that the crankshaft sample piece can freely vibrate in space; the relative positions of the vibration exciter 5 and the motor 9 on the lower platform of the stand can be adjusted according to the position, the shape and the size of the crankshaft sample piece 4.
Taking the bending and twisting composite test process of a certain type of crankshaft as an example, a test method corresponding to the bending and twisting composite load test device of the crankshaft is introduced, and the test method is mainly characterized by comprising the following steps: before the test is started, a lifting appliance 2 is connected with a sliding block, the sliding block is arranged on a sliding rail 6, a torsion clamp 3 and a bending clamp 7 are hung at symmetrical positions on two sides of the center of the test device through the lifting appliance 2, a crankshaft sample piece 4 participating in the test is clamped and fixed through the torsion clamp 3 and the bending clamp 7, the position of the sliding block connected with the lifting appliance 2 on the sliding rail 6 and the hanging height of a sling between the lifting appliance 2 and the sliding block are adjusted, and the crankshaft sample piece 4 obtains a proper test position in the horizontal and vertical directions; according to the hoisting position of the crankshaft sample piece 4, the positions of the vibration exciter 5 and the motor 9 arranged on the lower platform of the stand are adjusted to respectively apply pulsating and alternating loads to the torsion clamp 3 and the bending clamp 7 (namely, a vibration rod of the vibration exciter 5 can vertically abut against the lower side surface of the torsion clamp 3, and a rotating shaft and an eccentric wheel of the motor 9 are reasonably assembled and can normally run); according to the part position and the parameter type which need to be measured in the test, sensors such as a strain gauge and an accelerometer are arranged on the crankshaft sample piece 4, and power supply, control and data acquisition are carried out on the sensors, the vibration exciter 5, the motor 9 and other circuit elements through an electric control cabinet. During the test, a load signal with a certain frequency and amplitude is set by a computer, and the vibration exciter 5 and the motor 9 are driven to output pulsating and alternating loads through the signal generator and the power amplifier. A vibration rod of the vibration exciter 5 is vertically contacted with the torsion clamp 3 of the crankshaft, the vibration rod of the vibration exciter 5 is used for exciting and knocking the torsion clamp 3 to drive the torsion clamp 3 to swing in the torsion direction relative to the crankshaft sample piece 4, and a pulsating torque is applied to the crankshaft sample piece 4; the motor 9 drives the eccentric wheel 8 through a rotating shaft, and the eccentric wheel 8 drives the bending fixture 7 to swing in the bending direction relative to the crankshaft sample 4 so as to apply reciprocating alternating bending moment to the crankshaft sample 4. Through the torsion and bending loads, the crankshaft is forced to vibrate, output power is further adjusted after resonance is achieved, vibration frequency is changed, load forms and load magnitude required by tests are obtained, data of the sensors are read through the strain gauges, and accordingly the fatigue strength condition of the crankshaft is judged and analyzed. When the monitoring data has large amplitude change, the control circuit can automatically cut off the input of the vibration exciter 5 and the motor 9, so that the occurrence of accidents is prevented. After the test is finished and the test is stopped, the collected data are enabled to be effective, after relevant records are carried out, the connection between the vibration exciter 5 and the motor 9 and the torsion clamp 3 and the connection between the vibration exciter and the motor 9 and the bending clamp 7 are released, then the fixed relation between the crankshaft sample piece 4 and the torsion clamp 3 and the fixed relation between the crankshaft sample piece and the bending clamp 7 are released, the torsion clamp 3 and the bending clamp 7 are separated from the lifting appliance 2, finally the lifting appliance 2 and the sliding block are detached from the sliding rail 6, all the detached test device parts are orderly stored, and the test process is finished.
Claims (2)
1. The utility model provides a bent compound load test device that twists reverse of bent axle which characterized by: comprises a rack (1), a lifting appliance (2), a torsion clamp (3), a vibration exciter (5), a slide rail (6), a bending clamp (7), an eccentric wheel (8), a motor (9) and an electric control cabinet (10); the stand (1) is in a four-column shape and is provided with an upper platform and a lower platform, a sliding rail (6) for horizontal sliding is arranged on the lower surface of the upper platform, the electric control cabinet (10) is positioned below the lower platform, and the vibration exciter (5) and the motor (9) are positioned above the lower platform; the slide block on the slide rail (6) is connected with the lifting appliance (2), the lifting appliance (2) is used for hanging a torsion clamp (3) and a bending clamp (7), the torsion clamp (3) and the bending clamp (7) are used for fixing a crankshaft sample piece (4) and applying load to the crankshaft sample piece, a vibration rod of a vibration exciter (5) is vertically contacted with the torsion clamp (3), the vibration exciter (5) is used for exciting and knocking the torsion clamp (3), the torsion clamp (3) is driven to swing in the torsion direction relative to the crankshaft sample piece (4), and therefore pulsation torque is applied to the crankshaft sample piece (4); the bending fixture (7) is provided with a notch and is provided with an eccentric wheel (8), a motor (9) drives the eccentric wheel (8), and the bending fixture (7) is driven to swing relative to the bending direction of the crankshaft sample piece (4) through the eccentric motion of the eccentric wheel (8), so that reciprocating alternating bending moment is applied to the crankshaft sample piece (4);
the lifting appliance (2) can slide on the sliding rail (6) to adjust the position of the crankshaft sample piece (4) in a test, so that the crankshaft sample piece can freely vibrate in space; the relative positions of the vibration exciter (5) and the motor (9) on the platform under the stand can be adjusted according to the position, shape and size of the crankshaft sample piece (4);
the test method of the crankshaft bending and twisting composite load test device comprises the following steps: arranging a lifting appliance (2) on a sliding rail (6), hanging a torsion clamp (3) and a bending clamp (7) in the center of a test device through the lifting appliance (2), fixing a crankshaft sample piece (4) through the torsion clamp (3) and the bending clamp (7), and adjusting the position of the lifting appliance (2) on the sliding rail (6) and the hanging height to enable the crankshaft sample piece (4) to obtain a proper test position; according to the position of the crankshaft sample piece (4), adjusting the positions of a vibration exciter (5) and a motor (9) arranged on a lower platform of the rack, so that the vibration exciter and the motor respectively apply loads to a torsion clamp (3) and a bending clamp (7); the strain gauge sensor and the accelerometer sensor are arranged on the crankshaft sample piece (4), and the circuit elements including the sensor, the vibration exciter (5) and the motor (9) are powered, controlled and data collected through the electric control cabinet.
2. The crankshaft bending torsion composite load testing device according to claim 1, wherein: the electric control cabinet (10) comprises a power amplifier, a function generator and a dynamic strain gauge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011043114.6A CN112284660B (en) | 2020-09-28 | 2020-09-28 | Bent torsion composite load test device of bent axle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011043114.6A CN112284660B (en) | 2020-09-28 | 2020-09-28 | Bent torsion composite load test device of bent axle |
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| Publication Number | Publication Date |
|---|---|
| CN112284660A CN112284660A (en) | 2021-01-29 |
| CN112284660B true CN112284660B (en) | 2022-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011043114.6A Active CN112284660B (en) | 2020-09-28 | 2020-09-28 | Bent torsion composite load test device of bent axle |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113252478B (en) * | 2021-03-19 | 2022-12-13 | 浙江大学 | Vibration and multidirectional swinging composite load test device and test method |
| CN114608979A (en) * | 2022-03-22 | 2022-06-10 | 西南交通大学 | Bending-torsion composite high-temperature fretting fatigue test device |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| CN2729691Y (en) * | 2004-09-06 | 2005-09-28 | 浙江大学 | Crankshaft bending fatigue experiment system |
| CN201555782U (en) * | 2009-07-03 | 2010-08-18 | 中国第一汽车集团公司 | Crankshaft fatigue torsion testing device |
| CN201575899U (en) * | 2009-12-24 | 2010-09-08 | 洛阳西苑车辆与动力检验所有限公司 | Resonance type crankshaft bending fatigue tester based on strain control principle |
| CN103969042A (en) * | 2014-05-29 | 2014-08-06 | 长城汽车股份有限公司 | Crankshaft testing device |
| CN105372067A (en) * | 2015-12-28 | 2016-03-02 | 中北大学 | Torsional fatigue test device for crankshaft |
| CN109870360A (en) * | 2019-03-18 | 2019-06-11 | 吉林大学 | A kind of crankshaft reliability test |
| CN209495940U (en) * | 2019-01-10 | 2019-10-15 | 吉林大华机械制造有限公司 | A kind of fatigue tester |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016194728A1 (en) * | 2015-06-01 | 2016-12-08 | 新日鐵住金株式会社 | Method and device for inspection of crankshaft |
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2020
- 2020-09-28 CN CN202011043114.6A patent/CN112284660B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1598528A (en) * | 2004-09-06 | 2005-03-23 | 浙江大学 | Crankshaft bend fatigue test system and method |
| CN2729691Y (en) * | 2004-09-06 | 2005-09-28 | 浙江大学 | Crankshaft bending fatigue experiment system |
| CN201555782U (en) * | 2009-07-03 | 2010-08-18 | 中国第一汽车集团公司 | Crankshaft fatigue torsion testing device |
| CN201575899U (en) * | 2009-12-24 | 2010-09-08 | 洛阳西苑车辆与动力检验所有限公司 | Resonance type crankshaft bending fatigue tester based on strain control principle |
| CN103969042A (en) * | 2014-05-29 | 2014-08-06 | 长城汽车股份有限公司 | Crankshaft testing device |
| CN105372067A (en) * | 2015-12-28 | 2016-03-02 | 中北大学 | Torsional fatigue test device for crankshaft |
| CN209495940U (en) * | 2019-01-10 | 2019-10-15 | 吉林大华机械制造有限公司 | A kind of fatigue tester |
| CN109870360A (en) * | 2019-03-18 | 2019-06-11 | 吉林大学 | A kind of crankshaft reliability test |
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| CN112284660A (en) | 2021-01-29 |
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