阅读说明：本技术 一种转向架试验台 (Bogie test bed ) 是由 吴兴文 池茂儒 刘开成 胡凤龙 梁树林 温泽峰 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种转向架试验台,属于车辆工程技术领域。一种转向架试验台,包括：底座、龙门架、竖向加载装置、横向作动器、第一高频激振装置、第二高频激振装置以及采集系统；第一高频激振装置和第二高频激振装置均设置在底座上并且分别位于龙门架的两侧；第一高频激振装置和第二高频激振装置均包括均设置在底座上的驱动电机、第一滚动轮以及第二滚动轮,驱动电机与第一滚动轮和第二滚动轮连接。本发明通过改变第一滚动轮和第二滚动轮的边缘形状,可以对车轮振动频率进行调整,从而实现转向架处于不同高频振动工况下,由此可以对转向架的核心部件及附属件进行振动疲劳试验。(The invention discloses a bogie test bed, and belongs to the technical field of vehicle engineering. A bogie test stand comprising: the device comprises a base, a portal frame, a vertical loading device, a transverse actuator, a first high-frequency excitation device, a second high-frequency excitation device and an acquisition system; the first high-frequency excitation device and the second high-frequency excitation device are arranged on the base and are respectively positioned on two sides of the portal frame; the first high-frequency excitation device and the second high-frequency excitation device respectively comprise a driving motor, a first rolling wheel and a second rolling wheel which are arranged on the base, and the driving motor is connected with the first rolling wheel and the second rolling wheel. According to the invention, the vibration frequency of the wheels can be adjusted by changing the edge shapes of the first rolling wheel and the second rolling wheel, so that the bogie is under different high-frequency vibration working conditions, and thus, the vibration fatigue test can be carried out on the core components and accessories of the bogie.)

1. A bogie test stand, comprising: the device comprises a base (10), a portal frame (20), a vertical loading device (30), a transverse actuator (40), a first high-frequency vibration excitation device (50), a second high-frequency vibration excitation device (60) and an acquisition system; the portal frame (20) and the transverse actuator (40) are respectively arranged on the base (10); the vertical loading device (30) is suspended on a cross beam (21) of the portal frame (20); the first high-frequency excitation device (50) and the second high-frequency excitation device (60) are arranged on the base (10) and are respectively positioned on two sides of the portal frame (20).

2. The bogie test stand according to claim 1, wherein the first high frequency excitation device (50) and the second high frequency excitation device (60) each comprise a driving motor (51), a first rolling wheel (52) and a second rolling wheel (53) which are all arranged on the base (10), and the driving motor (51) is connected with the first rolling wheel (52) and the second rolling wheel (53); the edge shapes of the first rolling wheel (52) and the second rolling wheel (53) are both non-circular.

3. The bogie test stand according to claim 2, wherein the first rolling wheel (52) and the second rolling wheel (53) are respectively connected with the base (10) through a mounting seat (56), and a rubber pad is arranged at the position where the mounting seat (56) is connected with the base (10); the first rolling wheel (52) is connected with the second rolling wheel (53) through a connecting rod (54), and the connecting rod (54) is connected with the driving motor (51) through a coupling (55).

4. A bogie test stand according to claim 3 in which the first (52) and second (53) rolling wheels are each polygonal rollers.

5. The bogie test stand of claim 1, wherein the vertical loading device (30) comprises a vertical actuator (31) and a loading bolster (32); two ends of the vertical actuator (31) are respectively connected with the cross beam of the portal frame (20) and the loading sleeper beam (32); the vertical actuator (31) and the transverse actuator (40) are respectively connected with a hydraulic system.

6. The bogie test stand of claim 5, wherein the two ends of the same side of the loading bolster (32) are connected with tie rods (33) respectively; two ends of the pull rod (33) are respectively hinged with the loading sleeper beam (32) and the base (10), and the two pull rods (33) are distributed in a splayed shape.

7. The bogie test stand according to claim 1, characterized in that the bottom of the base (10) is provided with a damping system (11).

8. The bogie test bed according to any one of claims 1 to 7, wherein the acquisition system comprises a data acquisition unit, and an acceleration sensor and a strain gauge arranged on the bogie; the data sensor is respectively in communication connection with the acceleration sensor and the strain gauge.

9. The bogie test stand of claim 8, further comprising a rail tooling (70) corresponding to the first rolling wheel (52) and the second rolling wheel (53), respectively; the guide rail tool (70) comprises a bracket (71) and a track (72) arranged at the top of the bracket (71); the middle of the rail (72) is broken and forms a notch (73), the first rolling wheel (52) or the second rolling wheel (53) is placed in the notch (73), and the top edge of the first rolling wheel (52) or the second rolling wheel (53) is higher than the top of the rail (72).

10. The bogie test stand of claim 9 further comprising a safety line (80) for limiting over-displacement of the bogie.

Technical Field

The invention relates to the technical field of vehicle engineering, in particular to a bogie test bed.

Background

The bogie is a key component in the railway vehicle, plays roles in bearing, traction, braking, steering and vibration reduction, and is one of the cores of the research of a large system of the railway vehicle, so the structural strength and the dynamic parameters of the bogie are the key points of the design and the test of the bogie, and the bogie is required to carry out a fatigue strength test on a test bed in the design stage.

The load frequency of the traditional bogie fatigue test bed is lower and is not more than 5Hz, and in vehicle operation, particularly under the condition of rail corrugation and polygonal wheels, a bogie is very easy to be subjected to the load of high-frequency components, so that the mode resonance of the bogie is caused, the vibration fatigue problem is generated, and the fatigue life of the bogie is greatly shortened. Therefore, when the bogie fatigue test is carried out on the conventional bogie test bed, the applied fatigue load frequency is insufficient, the external excitation load of complex frequency components in the actual operation process of the bogie cannot be covered, and the obtained bogie fatigue life is not consistent with the actual operation life.

Disclosure of Invention

The invention aims to provide a bogie test bed, which aims to solve the problems that the existing bogie test bed has low load frequency and cannot perform vibration fatigue test.

The technical scheme for solving the technical problems is as follows:

a bogie test stand comprising: the device comprises a base, a portal frame, a vertical loading device, a transverse actuator, a first high-frequency excitation device, a second high-frequency excitation device and an acquisition system; the portal frame and the transverse actuator are respectively arranged on the base; the vertical loading device is suspended on a beam of the portal frame; the first high-frequency excitation device and the second high-frequency excitation device are arranged on the base and are respectively positioned on two sides of the portal frame.

According to the invention, the bogie can be vibrated at high frequency by the first high-frequency excitation device and the second high-frequency excitation device, so that the bogie is under a high-frequency vibration working condition, the core part and accessories of the bogie can be subjected to vibration acceleration, stress, strain and other test experiments, the measured data is subjected to post-processing, and the positions of the weak base metal of the bogie and the position damage of a welding line are calculated by utilizing an SN curve and the like, so that the vibration fatigue life of the bogie can be obtained.

Further, the first high-frequency excitation device and the second high-frequency excitation device respectively comprise a driving motor, a first rolling wheel and a second rolling wheel which are all arranged on the base, the driving motor is connected with the first rolling wheel and the second rolling wheel, and the edge shapes of the first rolling wheel and the second rolling wheel are non-circular.

When the bogie is tested, the wheels of the bogie are respectively contacted and matched with the first rolling wheel and the second rolling wheel, and the top of the bogie is connected with the vertical loading device to vertically fix the bogie. The vertical loading device and the transverse actuator act on the bogie and are used for simulating the interaction between the vehicle body and the bogie, so that loading is facilitated. When the first rolling wheel and the second rolling wheel rotate under the action of the driving motor, wheels of the bogie rotate along with the first rolling wheel and the second rolling wheel, the first rolling wheel and the second rolling wheel are non-circular in edge shape, high-frequency vibration is generated on the bogie, the bogie is under the working condition of high-frequency vibration, test experiments such as vibration acceleration, stress, strain and the like can be carried out on core components and accessories of the bogie, measured data are subjected to post-processing, and damage to the base metal position and the welding seam position of the bogie is calculated by utilizing an SN curve and the like, so that the vibration fatigue life of the bogie can be obtained.

Meanwhile, the edge shapes of the first rolling wheel and the second rolling wheel are adjusted, so that the bogie can be under different low-frequency and high-frequency vibration working conditions, and the traditional static strength and fatigue strength tests and the like can be performed.

Further, the first rolling wheels of the first high-frequency excitation device and the second high-frequency excitation device are disposed to face each other, and the second rolling wheels of the first high-frequency excitation device and the second high-frequency excitation device are disposed to face each other.

The first high-frequency excitation device and the second high-frequency excitation device respectively correspond to the front wheel set and the rear wheel set of the bogie, and the first rolling wheel and the second rolling wheel in the first high-frequency excitation device and the second high-frequency excitation device can be in contact with and matched with the wheels of the bogie, so that the front wheel set and the rear wheel set of the bogie are respectively loaded, and the working condition of the bogie is simulated.

Furthermore, the first rolling wheel and the second rolling wheel are respectively connected with the base through a mounting seat, and a rubber pad is arranged at the connecting position of the mounting seat and the base; the first rolling wheel is connected with the second rolling wheel through a connecting rod, and the connecting rod is connected with the driving motor through a coupling. .

The rubber pad has a damping effect on the mounting base, and avoids the vibration of the base from being transmitted to the rolling wheels, so that the vibration transmitted from the rolling wheels to the bogie is distorted, and the authenticity of a test is influenced.

Further, the first rolling wheel and the second rolling wheel are both polygonal rollers.

The first rolling wheel and the second rolling wheel are both polygonal rollers, so that high-frequency vibration can be generated on the bogie, and the bogie can be subjected to vibration fatigue test. In order to simulate wheel flats and the like, the first rolling wheel and the second rolling wheel may take other non-circular configurations.

Further, the vertical loading device comprises a vertical actuator and a loading sleeper beam; two ends of the vertical actuator are respectively connected with a cross beam of the portal frame and the loading sleeper beam; the vertical actuator and the horizontal actuator are respectively connected with a hydraulic system.

The vertical loading device is used for applying load to the loading sleeper beam, the loading sleeper beam is used for fixing the bogie, and the load generated by the vertical loading device is transferred to the bogie. The vertical actuator and the lateral actuator together load the bogie, thereby simulating the interaction between the vehicle body and the bogie.

Furthermore, two ends of the same side of the loading sleeper beam are respectively connected with a pull rod; two ends of the pull rod are respectively hinged with the loading sleeper beam and the base, and the two pull rods are distributed in a splayed shape.

The tie rod of the present invention is used to laterally position the load bolster so that the truck can be assisted in positioning.

Further, the bottom of the base is provided with a damping system.

Furthermore, the acquisition system comprises a data acquisition unit, an acceleration sensor and a strain gauge, wherein the acceleration sensor and the strain gauge are arranged on the bogie; the data sensor is respectively connected with the acceleration sensor and the strain gauge in a communication mode.

The acquisition device can acquire the acceleration of the bogie and the data of stress, strain and the like of each test point in the test process through the acceleration sensor and the strain gauge.

Further, the bogie test bed further comprises a guide rail tool which corresponds to the first rolling wheel and the second rolling wheel respectively; the guide rail tool comprises a bracket and a rail arranged at the top of the bracket; the middle part of the track is broken and forms a notch, the first rolling wheel or the second rolling wheel is arranged in the notch, and the top edge of the first rolling wheel or the second rolling wheel is higher than the top of the track.

The guide rail tool has a guiding function on the steering frame. When the bogie is placed on each rolling wheel, the bogie is inconvenient to place due to the fact that the contact surface between the bogie and the rolling wheels is small. The wheels of the bogie are placed on the rail, the bogie is moved, the wheels can be rotated to be in contact with the rolling wheels, and the placing operation of the bogie is simple, convenient, safe and effective.

Further, the bogie test bed also comprises a safety rope for limiting the over-displacement of the bogie.

One end of the safety rope is connected with the base, the other end of the safety rope is connected with the bogie, excessive displacement of the bogie is limited from multiple directions, and safety accidents caused by excessive displacement of the bogie are avoided.

The invention has the following beneficial effects:

(1) according to the invention, the vibration frequency of the wheels can be adjusted by changing the edge shapes of the first rolling wheel and the second rolling wheel, so that the bogie is under different high-frequency vibration working conditions, and thus, the vibration fatigue test can be carried out on the core components and accessories of the bogie.

(2) The invention can also realize that the bogie is under different low-frequency vibration working conditions, thereby not only carrying out vibration fatigue tests, but also carrying out traditional static strength and fatigue strength tests and the like.

(3) When the bogie is placed on each rolling wheel, the bogie is inconvenient to place due to the fact that the contact surface between the bogie and the rolling wheels is small. The wheels of the bogie are placed on the rail, the bogie is moved, the wheels can be rotated to be in contact with the rolling wheels, and the placing operation of the bogie is simple, convenient, safe and effective.

Drawings

FIGS. 1 and 2 are schematic structural views of a bogie test stand according to the present invention;

fig. 3 is a schematic structural diagram of a first high-frequency excitation device and a guide rail tool according to the present invention;

FIG. 4 is a schematic structural diagram of a first high frequency excitation device of the present invention;

FIG. 5 is a schematic structural view of the guide rail tool of the present invention;

fig. 6 is a schematic view of the connection between the bogie and the experimental bench according to the present invention.

In the figure: 10-a base; 11-a shock absorbing system; 20-a portal frame; 21-a cross beam; 30-a vertical loading device; 31-a vertical actuator; 32-load bolster; 33-a pull rod; 40-a lateral actuator; 50-a first high frequency excitation device; 51-a drive motor; 52-a first scroll wheel; 53-a second scroll wheel; 54-a connecting rod; 55-coupling; 56-mounting seat; 60-a second high frequency excitation device; 70-guide rail tooling; 71-a scaffold; 72-track; 73-a gap; 80-safety rope; 90-bogie.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.