CN112729880B - Fatigue test bed for suspension beam of urban rail vehicle - Google Patents
Fatigue test bed for suspension beam of urban rail vehicle Download PDFInfo
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- CN112729880B CN112729880B CN202110095945.6A CN202110095945A CN112729880B CN 112729880 B CN112729880 B CN 112729880B CN 202110095945 A CN202110095945 A CN 202110095945A CN 112729880 B CN112729880 B CN 112729880B
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Abstract
A fatigue test bed for suspension beams of urban rail vehicles comprises a test bed structure connecting piece, a bidirectional vibration exciter, a unidirectional vibration exciter, a counterweight component, a counting device and a monitoring device; the test bed structure connecting piece comprises a supporting seat, a connecting beam and a vibration exciter mounting plate; the top of the supporting seat is fixedly connected with the end part of a suspension beam of the urban rail vehicle; two ends of the connecting beam are connected to the lifting lugs of the urban rail vehicle suspension beam, and the connecting beams are arranged in parallel; the vibration exciter mounting plate is fixedly arranged on the connecting beam; the bidirectional vibration exciter and the unidirectional vibration exciter are both arranged on the vibration exciter mounting plate; the counting device is respectively arranged on the bidirectional vibration exciter and the unidirectional vibration exciter. The invention can provide sinusoidal alternating load with adjustable frequency in three directions for fatigue test of suspension beams of urban rail vehicles, the horizontal vibration direction can be changed flexibly and conveniently, the vibration force can be accurately adjusted, the load cycle number can be accurately recorded, and the applicability is strong.
Description
Technical Field
The invention belongs to the technical field of urban rail vehicle structural strength, and particularly relates to a fatigue test bed for a suspension beam of an urban rail vehicle.
Background
With the continuous expansion of urban scale and the great increase of traffic flow, urban rail transit is a necessary trend of urban development nowadays, and gradually becomes a support for urban public transport due to the advantages of large transportation capacity, all weather, safety, reliability, economy, energy conservation and the like. The aluminum alloy suspension seat (beam) is used as a key part in the urban rail vehicle composition structure and is responsible for the bearing tasks of a vehicle body suspension type traction motor and electrical parts, and fatigue damage is easy to occur due to the fact that the aluminum alloy suspension seat (beam) can simultaneously bear periodic vibration, motor torque and multi-source load of a brake module from a vehicle body in actual work and the characteristics of complex structure and discrete material fatigue characteristics of an aluminum alloy forging.
In order to more effectively research the stress state and the fatigue strength of the aluminum alloy suspension seat (beam) structure, strictly perform reliability test according to the fatigue test standards in the relevant standards, and facilitate the operation safety and detection and maintenance of trains, a fatigue test bed applicable to the aluminum alloy suspension seat (beam) needs to be designed and developed, most of the existing relevant fatigue test beds are single-degree-of-freedom sine or square wave vibration, and the defects of weak bearing capacity, incapability of dynamically adjusting a vibration source, unstable vibration signals, poor acceleration test effect and the like exist.
Disclosure of Invention
The invention aims to provide a fatigue test bed for a suspension beam of an urban rail vehicle, which aims to solve the problems that the existing related fatigue test bed in the background technology is mostly single-degree-of-freedom sine or square wave vibration, and has the defects of weaker bearing capacity, incapability of dynamically adjusting a vibration source, unstable vibration signals, poorer acceleration test effect and the like.
In order to achieve the aim, the invention provides a fatigue test bed for a suspension beam of an urban rail vehicle, which is used for a fatigue test of the suspension beam of the urban rail vehicle and comprises a test bed structure connecting piece, a bidirectional vibration exciter, a unidirectional vibration exciter, a counterweight component, a counting device and a monitoring device;
the test bed structure connecting piece comprises four supporting seats for supporting, more than four connecting beams and a vibration exciter mounting plate, wherein the four supporting seats are distributed in a rectangular shape; the top parts of the supporting seats are fixedly connected with the end parts of the urban rail vehicle suspension beams for fatigue tests, and the two urban rail vehicle suspension beams are arranged on the four supporting seats in parallel; two ends of the connecting beam are connected to lifting lugs of suspension beams of urban rail vehicles, and the connecting beams are arranged in parallel; the vibration exciter mounting plate is fixedly arranged on the connecting beam;
the bidirectional vibration exciter and the unidirectional vibration exciter are both directly or indirectly arranged on the vibration exciter mounting plate, and the bidirectional vibration exciter is used for exciting vibration in a first horizontal direction and a first vertical direction of a fatigue test bed of a suspension beam of an urban rail vehicle; the one-way vibration exciter is used for exciting vibration of the fatigue test bed of the suspension beam of the urban rail vehicle in a second horizontal direction;
the counterweight component comprises a counterweight block and a counterweight block bearing plate, the counterweight block bearing plate is fixedly arranged on the connecting beam, and the counterweight block is detachably arranged on the counterweight block bearing plate;
the counting devices are respectively arranged on the bidirectional vibration exciter and the unidirectional vibration exciter and are used for recording the rotation turns of the vibration exciter shaft;
the monitoring device is a camera and is used for monitoring the rotating speed of a motor of the vibration exciter, recording the condition of the counting device and observing and recording the running state of the whole fatigue test bed for the suspension beam of the urban rail vehicle.
In a specific embodiment, the bidirectional vibration exciter comprises a bidirectional vibration exciter motor, an eccentric block, a bidirectional vibration exciter eccentric block rotating shaft, a bidirectional vibration exciter connecting bottom plate, a bidirectional vibration exciter motor support, a bidirectional vibration exciter coupling, a bearing, a bidirectional vibration exciter bearing support and a bidirectional vibration exciter protective cover; the bidirectional vibration exciter motor support and the bidirectional vibration exciter bearing support are directly or indirectly arranged on the bidirectional vibration exciter connecting bottom plate; the bidirectional vibration exciter motor is fixedly arranged on the bidirectional vibration exciter motor bracket; the eccentric block is arranged on a rotating shaft of the eccentric block of the bidirectional vibration exciter; the bidirectional vibration exciter eccentric block rotating shaft is arranged on a bidirectional vibration exciter bearing support through a bearing, and a bidirectional vibration exciter motor is connected with the bidirectional vibration exciter eccentric block rotating shaft through a bidirectional vibration exciter coupler to drive the eccentric block to rotate; the bidirectional vibration exciter connecting bottom plate is used for being directly or indirectly connected with the vibration exciter mounting plate; the bidirectional vibration exciter protective cover is arranged on the bidirectional vibration exciter connecting bottom plate and used for carrying out safety protection on the rotating area of the eccentric block of the bidirectional vibration exciter.
In a specific embodiment, the bidirectional vibration exciter motor is a horizontal speed-adjustable gear reduction motor; the eccentric block is detachably arranged on the rotating shaft of the eccentric block of the bidirectional vibration exciter; the bidirectional vibration exciter further comprises a motor cushion block, and the motor cushion block is arranged between the motor bracket of the bidirectional vibration exciter and the connecting bottom plate of the bidirectional vibration exciter and is used for facilitating the installation of the motor of the bidirectional vibration exciter; the counting device on the bidirectional vibration exciter is arranged on the bidirectional vibration exciter protective cover.
In a specific embodiment, the unidirectional vibration exciter comprises a unidirectional vibration exciter motor, an eccentric block, two unidirectional vibration exciter eccentric block rotating shafts, a unidirectional vibration exciter transfer bottom plate, a unidirectional vibration exciter mounting plate, a unidirectional vibration exciter motor support, a unidirectional vibration exciter coupling, a gear pair, a bearing, a unidirectional vibration exciter bearing support and a unidirectional vibration exciter protective cover; the transfer bottom plate of the unidirectional vibration exciter comprises a bottom plate and a vertical plate, wherein the plate surfaces of the bottom plate and the vertical plate are mutually vertical, and one end of the vertical plate is fixedly connected with the upper plate surface of the bottom plate; the unidirectional vibration exciter mounting plate is fixedly arranged on one side plate surface of the vertical plate of the unidirectional vibration exciter adapter bottom plate; the unidirectional vibration exciter motor support and the unidirectional vibration exciter bearing support are fixedly arranged on the unidirectional vibration exciter mounting plate; the unidirectional vibration exciter motor is fixedly arranged on the unidirectional vibration exciter motor bracket; the eccentric block is fixedly arranged on a rotating shaft of the eccentric block of the unidirectional vibration exciter; the two unidirectional vibration exciter eccentric block rotating shafts are arranged on a unidirectional vibration exciter bearing support in parallel through bearings, and eccentric blocks arranged on the two unidirectional vibration exciter eccentric block rotating shafts are identical in weight and symmetrically distributed in a staggered manner; the two eccentric block rotating shafts of the unidirectional vibration exciter are connected through a gear pair, and the transmission ratio of the gear pair is-1; the unidirectional vibration exciter motor is connected with a unidirectional vibration exciter eccentric block rotating shaft through a unidirectional vibration exciter coupler to drive the eccentric block to rotate; the unidirectional vibration exciter adapter bottom plate is used for being directly or indirectly connected with the vibration exciter mounting plate; the one-way vibration exciter protective cover is arranged on the one-way vibration exciter mounting plate and used for carrying out safety protection on the rotating area of the eccentric block.
In a specific embodiment, the one-way vibration exciter motor is a horizontal speed-adjustable gear reduction motor; the eccentric block is detachably arranged on the rotating shaft of the eccentric block of the unidirectional vibration exciter; a handle for facilitating lifting is arranged on the one-way vibration exciter mounting plate; the counting device on the unidirectional vibration exciter is arranged on the unidirectional vibration exciter protective cover; the gears in the gear pair are straight spur gears with hard tooth surfaces.
In a specific implementation mode, the fatigue test bed for the suspension beam of the urban rail vehicle further comprises a reversing device, wherein the reversing device comprises two hollow rotary speed reducers which are respectively arranged between a bidirectional vibration exciter and a vibration exciter mounting plate and between a unidirectional vibration exciter and the vibration exciter mounting plate; the two hollow rotary speed reducers are respectively used for reversing the rotation of the bidirectional vibration exciter and the unidirectional vibration exciter.
In a specific embodiment, the weight member comprises a weight block and four weight block bearing plates; four balancing weight loading boards are distributed on the connecting beam in a rectangular shape. The counterweight component is used for providing accurate loading conditions required by the test, and plays a role in balancing weight increment on the whole test bed, so that the vibration generated by the vibration exciter is more stable.
In a specific embodiment, the motor shafts of the bidirectional vibration exciter and the unidirectional vibration exciter are perpendicular to each other in a horizontal plane.
In a specific embodiment, the exciter mounting plate is fixedly connected with all the connecting beams.
In a specific embodiment, the bottom parts of the supporting seats are fixedly arranged on the ground, and supporting seat reinforcing members for reinforcing are arranged between the bottom parts of the supporting seats.
Compared with the prior art, the invention has the following beneficial effects:
the invention can provide sinusoidal alternating load with adjustable frequency in three directions for fatigue test of suspension beams of urban rail vehicles, the horizontal vibration direction can be changed flexibly and conveniently, the vibration force can be accurately adjusted, the load cycle number can be accurately recorded, and the applicability is strong.
The invention can specifically adjust the vibration direction through the combination of any one-way, any two-way or three-way, and the flexibility is obviously superior to that of a common fatigue test bed.
The invention can adjust the vibration force by increasing or decreasing the load of the eccentric block; the load cycle times can reach 100 ten thousand times under the condition of one-time continuous startup, and the aluminum alloy suspension seat (beam) vibration test bed can bear the load of 0.7t-1t, and the size of the static load can be accurately adjusted by increasing or decreasing the rectangular balancing weight; the base has no special requirements on the foundation and has strong applicability.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of one embodiment of the present invention;
fig. 2 is a schematic structural view of a unidirectional vibration exciter according to an embodiment of the present invention;
FIG. 3 is a side schematic view of a unidirectional exciter according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a bidirectional vibration exciter according to an embodiment of the present invention;
FIG. 5 is a side schematic view of a bi-directional exciter according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of an eccentric mass according to an embodiment of the present invention;
fig. 7 is a schematic view of a reversing device according to an embodiment of the invention.
01, urban rail vehicle suspension beams; 1. a test bed structure connecting piece; 2. a bidirectional vibration exciter; 3. a unidirectional vibration exciter; 4. a weight member; 5. a counting device; 6. a reversing device; 10. an eccentric block; 11. a supporting seat; 12. a connecting beam; 13. a vibration exciter mounting plate; 21. a bidirectional vibration exciter motor; 22. a bidirectional vibration exciter protective cover; 23. an eccentric block rotating shaft of the bidirectional vibration exciter; 24. the bidirectional vibration exciter is connected with the bottom plate; 25. a bidirectional vibration exciter motor bracket; 26. a bidirectional vibration exciter coupler; 27. a bearing support of the bidirectional vibration exciter; 29. a motor cushion block; 31. a unidirectional vibration exciter motor; 32. a protective cover of the unidirectional vibration exciter; 33. the eccentric block rotating shaft of the unidirectional vibration exciter; 34. the unidirectional vibration exciter is connected with the bottom plate in a switching way; 35. a unidirectional vibration exciter mounting plate; 36. a motor bracket of the unidirectional vibration exciter; 37. a one-way vibration exciter coupling; 38. a gear pair; 39. a bearing support of the unidirectional vibration exciter; 310. a handle; 41. a balancing weight; 42. a weight block bearing plate.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example 1
The invention provides a fatigue test stand for suspension beams of urban rail vehicles, which is used for fatigue test of the suspension beams of the urban rail vehicles and comprises the following components: test bench structure connecting piece 1, two-way vibration exciter 2, one-way vibration exciter 3, counter weight part 4, counting assembly 5 and monitoring device. The acceleration test performance, the stability of alternating load and the accuracy of the cyclic test record of the invention directly influence the test effect, and the power sources are all provided by a low-noise horizontal gear reduction motor to drive an eccentric block with a specific shape, a specific size and a specific weight to rotate so as to meet the specific dynamic load.
In one embodiment, the urban rail vehicle suspension beam 01 is an aluminum alloy suspension beam, the length of the suspension beam is 2m, the width of the suspension beam is 0.2m, the installation interval is 2m, each beam is provided with 4 lifting lugs serving as a load working area, and the center of each lifting lug is provided with a through hole phi 19 mm.
Test bench structural connection 1: the design adopts the section bars based on the I-shaped steel, the channel steel and the steel plate to connect the suspension beam 01 of the urban rail vehicle, simulate the actual installation and load-bearing environment, connect the counterweight component 4 and the vibration exciter, the thickness of the section bars is 10-15mm, and simultaneously, the distance between the suspension beam 01 of the urban rail vehicle and the ground is 0.5-1m after the suspension beam 01 of the urban rail vehicle is installed. The test bed can bear the total load capacity of 1t including parts such as urban rail vehicle suspension beams 01, vibration exciters and the like, and has high structural stability and no special requirements on test fields.
And 2, a bidirectional vibration exciter: in order to generate alternating load under certain frequency, the adopted scheme is that a 400W horizontal speed-adjustable gear reduction motor drives a fan-shaped steel eccentric block with 20kg on a single shaft in total to rotate, the sine-change excitation force with certain frequency generated by the rotating centrifugal force of the eccentric block 10 serves as the dynamic load in a fatigue test, in order to facilitate installation and disassembly, the eccentric block 10 has 4 pieces in total, the weight of each piece of material is the same, threaded holes are drilled in the side faces, the weight of the eccentric block can be adjusted, and the function of changing the dynamic load is realized. The bidirectional vibration exciter is responsible for generating exciting force in a first horizontal direction and a first vertical direction, the bottom of the bidirectional vibration exciter is provided with a bidirectional vibration exciter connecting bottom plate 24 which is used for being connected with the vibration exciter mounting plate 13 of the test bed structure connecting piece 1, and the periphery of the eccentric block 10 is provided with a bidirectional vibration exciter protective cover 22 for improving safety.
A one-way vibration exciter 3: a horizontal speed-adjustable gear reduction motor with the same type as a bidirectional vibration exciter is adopted to drive two eccentric blocks which are provided with the same weight and symmetrically and alternately distributed and total 20kg to rotate, two unidirectional vibration exciter eccentric block rotating shafts 33 are connected by a pair of gear pairs 38 with the transmission ratio of-1, a hard tooth surface straight tooth cylindrical gear is adopted, the modulus is 2.5, and the tooth number is 53. Therefore, the double shafts run in the opposite directions at the same rotating speed, and the centrifugal force components of the eccentric block 10 in the vertical direction are mutually offset, so that the requirement of only generating the exciting force in the horizontal direction is met. The unidirectional vibration exciter 3 is integrally fixed on the vibration exciter mounting plate 13 through the unidirectional vibration exciter mounting plate 35 and the unidirectional vibration exciter adapter bottom plate 34, and the unidirectional vibration exciter protective cover 32 is arranged in the rotating area of the eccentric block 10 to play a role in safety protection.
The eccentric block rotating shaft is a forging stepped shaft; the motor is connected with the eccentric block rotating shaft through a quincunx coupler. The eccentric block rotating shaft is arranged on the bearing support through a deep groove ball bearing.
A weight member: including the balancing weight loading board 42 and the detachable balancing weight 41 of setting on the balancing weight loading board that 4 regions set up, the material of use is cast iron, and each regional adjustable maximum range is 1t, and the balancing weight unit is 5kg to 25kg to provide experimental required accurate load condition, play the effect that the balance was increased weight to whole test bench simultaneously, let the vibration that the vibration exciter produced more steady.
A reversing device: including 2 rotatory speed reducer of YT200 cavity, install in test bench two places position, a unidirectional vibration exciter and two-way vibration exciter are used for connecting respectively, use high accuracy gear structure and journal bearing, torque moment and rigidity have been improved, it is more steady to bear, arbitrary angular rotation can be done to collocation servo motor, 2 combination collocation can realize the first horizontal direction of fatigue test bench, the second horizontal direction, the unilateral vibration of vertical direction or arbitrary bi-directional vibration or the three-directional simultaneous oscillation, the accuracy and the operational reliability of vibration direction have been guaranteed with the help of servo motor's electromagnetic braking.
The counting device comprises two DA6-7A-1A CIBIS photoelectric counters, and the embodiment is that the photoelectric counters are respectively arranged on the protective covers of the unidirectional vibration exciter and the bidirectional vibration exciter and record the rotation turns of the vibration exciter shaft. The effective record number of turns of one continuous test is 999999 turns, and the automatic zero clearing and recounting are carried out when 99999999 turns are full.
The monitoring device comprises a Batianan camera and a 360-degree camera, the monitoring system is a remote monitoring system based on the Internet, and meanwhile, the monitoring device has a local recording function, monitors the test condition in real time, records faults and other problems. The implementation mode is that 360 cameras are responsible for monitoring motor speed and photoelectric counter record condition, and the ba tianan camera is installed in experimental place eminence for observe and record the running state of whole test bench.
The alternating load in this test is generated by both the unidirectional vibration exciter and the bidirectional vibration exciter. The vibration exciter adopts a rotary eccentric block structure, and an eccentric block with a certain size is driven by a gear reduction motor 7IK400RGU-CF 7GU3K to rotate at the rotating speed of 300r/min to generate centrifugal force as a vibration force source. According to a centrifugal force calculation formula:
F＝mrω2＝1029N
the eccentric block adopts a fan-shaped design and is installed in a unit form, and the used material is 45 steel with the density of 7850kg/m3The weight of one eccentric block unit is 5kg, the eccentricity is 0.05213m, 4 eccentric block units are installed on the bidirectional vibration exciter, the total weight is 20kg, the eccentric force required by the test is just met, the side face of the eccentric block unit is provided with a threaded hole, and the weight of the eccentric block can be adjusted to realize the change of the exciting force. Similarly, the unidirectional vibration exciter also uses 4 eccentric block units, and the installation positions of the eccentric block units are symmetrically and alternately distributed on two shafts respectively. Therefore, the rotating speeds of the eccentric blocks on the two shafts are the same, the rotating directions are opposite, and the purpose of unidirectional vibration can be realized by adding the unidirectional vibration exciter adapter base plate 34 to adjust the direction during installation. The motor shafts of the unidirectional vibration exciter and the bidirectional vibration exciter are mutually and vertically arranged on the vibration exciter mounting plate 13.
The test bed structure connecting piece 1 comprises 4 supporting seats 11, 4 connecting beams 12 and 1 steel plate-shaped vibration exciter mounting plate 13. The supporting seat 11 is fixed on the ground, the urban rail vehicle suspension beams 01 are supported through bolt connection, the distance between the supporting seat and the ground is kept to be 0.5m, the two ends of the 4 connecting beams 12 are respectively connected with the lifting lug parts of the 2 urban rail vehicle suspension beams 01 through bolts, and configuration parts with certain weight are symmetrically arranged; the 4 connecting beams 12 are installed in parallel, the vibration exciter mounting plate 13 is vertically installed on the 4 connecting beams 12 through bolt connection, and then the vibration exciter is fixed on the vibration exciter mounting plate through bolt connection. And then arranging a CIBIS photoelectric counter of DA6-7A-1A type at the exciter shield for recording the number of load cycles. A camera is arranged in front of a counter screen and the test bed to remotely monitor the load circulation condition and the working condition of the test bed.
In the fatigue test, when the load cycle number reaches 100 ten thousand times, the machine is stopped to check the clamping condition of the suspension beam, nondestructive testing of all parts of the suspension beam is carried out, the testing result is recorded, and the subsequent testing process is carried out.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (9)
1. A fatigue test bed for suspension beams of urban rail vehicles is used for fatigue tests of the suspension beams of the urban rail vehicles and is characterized by comprising a test bed structure connecting piece (1), a bidirectional vibration exciter (2), a unidirectional vibration exciter (3), a counterweight component (4), a counting device (5) and a monitoring device;
the test bed structure connecting piece (1) comprises four supporting seats (11) for supporting, more than four connecting beams (12) and a vibration exciter mounting plate (13), wherein the four supporting seats (11) are distributed in a rectangular shape; the top parts of the supporting seats (11) are fixedly connected with the end parts of urban rail vehicle suspension beams (01) for fatigue tests, and the two urban rail vehicle suspension beams (01) are arranged on the four supporting seats (11) in parallel; two ends of the connecting beams (12) are connected to lifting lugs of the urban rail vehicle suspension beams (01), and the connecting beams (12) are arranged in parallel; the vibration exciter mounting plate (13) is fixedly arranged on the connecting beam (12);
the bidirectional vibration exciter (2) and the unidirectional vibration exciter (3) are both directly or indirectly arranged on the vibration exciter mounting plate (13), and the bidirectional vibration exciter (2) is used for exciting vibration in a first horizontal direction and a first vertical direction of a fatigue test bed of a suspension beam of an urban rail vehicle; the unidirectional vibration exciter (3) is used for exciting vibration of the fatigue test bed of the suspension beam of the urban rail vehicle in a second horizontal direction;
the counterweight component (4) comprises a counterweight block (41) and a counterweight block bearing plate (42), the counterweight block bearing plate (42) is fixedly arranged on the connecting beam (12), and the counterweight block (41) is detachably arranged on the counterweight block bearing plate (42);
the counting device (5) is respectively arranged on the bidirectional vibration exciter (2) and the unidirectional vibration exciter (3) and is used for recording the rotation turns of the vibration exciter shaft;
the monitoring device is a camera and is used for monitoring the rotating speed of a motor of the vibration exciter, recording the condition by the counting device and observing and recording the running state of the whole fatigue test bed of the suspension beam of the urban rail vehicle;
the bidirectional vibration exciter (2) comprises a bidirectional vibration exciter motor (21), an eccentric block (10), a bidirectional vibration exciter eccentric block rotating shaft (23), a bidirectional vibration exciter connecting bottom plate (24), a bidirectional vibration exciter motor support (25), a bidirectional vibration exciter coupling (26), a bearing, a bidirectional vibration exciter bearing support (27) and a bidirectional vibration exciter protective cover (22); the bidirectional vibration exciter motor support (25) and the bidirectional vibration exciter bearing support (27) are directly or indirectly arranged on the bidirectional vibration exciter connecting bottom plate (24); the bidirectional vibration exciter motor (21) is fixedly arranged on the bidirectional vibration exciter motor bracket (25); the eccentric block (10) is arranged on a rotating shaft (23) of the eccentric block of the bidirectional vibration exciter; the bidirectional vibration exciter eccentric block rotating shaft (23) is arranged on a bidirectional vibration exciter bearing support (27) through a bearing, and a bidirectional vibration exciter motor (21) is connected with the bidirectional vibration exciter eccentric block rotating shaft (23) through a bidirectional vibration exciter coupler (26) to drive the eccentric block (10) to rotate; the bidirectional vibration exciter connecting bottom plate (24) is used for being directly or indirectly connected with the vibration exciter mounting plate (13); the bidirectional vibration exciter protective cover (22) is arranged on the bidirectional vibration exciter connecting bottom plate (24) and used for carrying out safety protection on the rotating area of the eccentric block of the bidirectional vibration exciter.
2. The fatigue test bed for suspension beams of urban rail vehicles according to claim 1, wherein the bidirectional vibration exciter motor (21) is a horizontal speed-adjustable gear reduction motor; the eccentric block (10) is detachably arranged on the rotating shaft (23) of the eccentric block of the bidirectional vibration exciter; the bidirectional vibration exciter (2) further comprises a motor cushion block (29), and the motor cushion block (29) is arranged between the bidirectional vibration exciter motor support (25) and the bidirectional vibration exciter connecting bottom plate (24) and is used for facilitating the installation of a bidirectional vibration exciter motor (21); the counting device on the bidirectional vibration exciter is arranged on a bidirectional vibration exciter protective cover (22).
3. The fatigue test bed for the suspension beam of the urban rail vehicle as claimed in claim 1, wherein the unidirectional vibration exciter (3) comprises a unidirectional vibration exciter motor (31), an eccentric block (10), two unidirectional vibration exciter eccentric block rotating shafts (33), a unidirectional vibration exciter adapter bottom plate (34), a unidirectional vibration exciter mounting plate (35), a unidirectional vibration exciter motor bracket (36), a unidirectional vibration exciter coupling (37), a gear pair (38), a bearing, a unidirectional vibration exciter bearing support (39) and a unidirectional vibration exciter shield (32); the one-way vibration exciter transfer bottom plate (34) comprises a bottom plate and a vertical plate, wherein the plate surfaces of the bottom plate and the vertical plate are mutually vertical, and one end of the vertical plate is fixedly connected with the upper plate surface of the bottom plate; the unidirectional vibration exciter mounting plate (35) is fixedly arranged on one side plate surface of the vertical plate of the unidirectional vibration exciter adapter bottom plate (34); the unidirectional vibration exciter motor support (36) and the unidirectional vibration exciter bearing support (39) are fixedly arranged on the unidirectional vibration exciter mounting plate (35); the unidirectional vibration exciter motor (31) is fixedly arranged on the unidirectional vibration exciter motor bracket (36); the eccentric block (10) is fixedly arranged on a rotating shaft (33) of the eccentric block of the unidirectional vibration exciter; two one-way vibration exciter eccentric block rotating shafts (33) are arranged on a one-way vibration exciter bearing support (39) in parallel through bearings, and eccentric blocks (10) arranged on the two one-way vibration exciter eccentric block rotating shafts (33) are identical in weight and symmetrically distributed in a staggered manner; two eccentric block rotating shafts (33) of the unidirectional vibration exciters are connected through a gear pair (38), and the transmission ratio of the gear pair (38) is-1; the one-way vibration exciter motor (31) is connected with a one-way vibration exciter eccentric block rotating shaft (33) through a one-way vibration exciter coupler (37) to drive the eccentric block (10) to rotate; the unidirectional vibration exciter adapter bottom plate (34) is used for being directly or indirectly connected with the vibration exciter mounting plate (13); the one-way vibration exciter protective cover (32) is arranged on the one-way vibration exciter mounting plate (35) and used for carrying out safety protection on the rotating area of the eccentric block.
4. The fatigue test bed for suspension beams of urban rail vehicles according to claim 3, wherein the one-way vibration exciter motor (31) is a horizontal speed-adjustable gear reduction motor; the eccentric block (10) is detachably arranged on the rotating shaft (33) of the eccentric block of the unidirectional vibration exciter; a handle (310) for facilitating lifting is arranged on the one-way vibration exciter mounting plate (35); the counting device on the one-way vibration exciter is arranged on a one-way vibration exciter protective cover (32); the gears in the gear pair (38) are spur gears with hard tooth surfaces.
5. The fatigue test bed for the suspension beam of the urban rail vehicle as claimed in claim 1, further comprising a reversing device (6), wherein the reversing device (6) comprises two hollow rotary speed reducers respectively arranged between the bidirectional vibration exciter (2) and the vibration exciter mounting plate (13) and between the unidirectional vibration exciter (3) and the vibration exciter mounting plate (13); the two hollow rotary speed reducers are respectively used for reversing the rotation of the bidirectional vibration exciter and the unidirectional vibration exciter.
6. The fatigue test bench for urban rail vehicle suspension beams according to claim 1, wherein the counterweight member (4) comprises a counterweight (41) and four counterweight bearing plates (42); four balancing weight loading boards are distributed on the connecting beam in a rectangular shape.
7. The fatigue test bed for suspension beams of urban rail vehicles according to claim 1, wherein motor shafts of the bidirectional vibration exciter and the unidirectional vibration exciter are vertical to each other in a horizontal plane.
8. The fatigue test bed for suspension beams of urban rail vehicles according to claim 1, characterized in that the vibration exciter mounting plate (13) is fixedly connected with all the connecting beams (12).
9. The fatigue test bed for urban rail vehicle suspension beams according to claim 1, is characterized in that the bottoms of the supporting seats (11) are fixedly arranged on the ground, and supporting seat reinforcing members for reinforcing are arranged between the bottoms of the supporting seats (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110095945.6A CN112729880B (en) | 2021-01-25 | 2021-01-25 | Fatigue test bed for suspension beam of urban rail vehicle |
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| CN202110095945.6A CN112729880B (en) | 2021-01-25 | 2021-01-25 | Fatigue test bed for suspension beam of urban rail vehicle |
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| Publication Number | Publication Date |
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| CN112729880A CN112729880A (en) | 2021-04-30 |
| CN112729880B true CN112729880B (en) | 2022-02-01 |
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| CN202110095945.6A Active CN112729880B (en) | 2021-01-25 | 2021-01-25 | Fatigue test bed for suspension beam of urban rail vehicle |
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| CN117589482B (en) * | 2024-01-19 | 2024-04-09 | 驰田汽车技术研发武汉有限公司 | Balanced suspension fatigue test equipment and balanced suspension structure |
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| CN103394461B (en) * | 2013-08-16 | 2015-04-01 | 安徽理工大学 | Series-parallel vibrating screen with five degrees of freedom |
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| CN110174228B (en) * | 2019-06-28 | 2024-01-30 | 中铁二院工程集团有限责任公司 | Broadband excitation test device for magnetic levitation beam rail structure |
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