CN114923987B - Vehicle-mounted movable excitation device for steel rail modal test - Google Patents
Vehicle-mounted movable excitation device for steel rail modal test Download PDFInfo
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- 230000005284 excitation Effects 0.000 title claims abstract description 74
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 60
- 239000010959 steel Substances 0.000 title claims abstract description 60
- 238000012360 testing method Methods 0.000 title claims abstract description 56
- 230000007246 mechanism Effects 0.000 claims abstract description 76
- 230000007306 turnover Effects 0.000 claims description 46
- 230000008602 contraction Effects 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010219 correlation analysis Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 6
- 238000005452 bending Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
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- G—PHYSICS
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- G01N2291/0234—Metals, e.g. steel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/0289—Internal structure, e.g. defects, grain size, texture
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
A portable excitation device of on-vehicle for rail modal test solves the test efficiency that prior art exists low, and manpower and time cost are high, and vibration information transmission path is complicated, influences the problem that test accuracy, practicality are poor. The vehicle-mounted driving mechanism comprises a moving base, wherein a traveling roller of the vehicle-mounted driving mechanism is rotationally connected with the moving base through a roller rotating shaft, and a rotating shaft driving gear arranged on the roller rotating shaft is connected with a traveling driving motor; base lifting mechanisms are respectively arranged on two sides of the front end and the rear end of the movable base; the two sides of the middle part of the movable base are symmetrically provided with overturning excitation mechanisms respectively, and the movable base is provided with a hydraulic pump station and an exciter air supply system. The device has reasonable design and compact structure, can realize the change of the vertical and transverse excitation directions of the steel rail, can meet the requirements of the correlation analysis of excitation of different directions and different-order vibration of the specific steel rail, can quickly detect the corresponding damage of the steel rail, and has strong practicability and reliable use.
Description
Technical Field
The invention belongs to the technical field of railway track engineering, and particularly relates to a vehicle-mounted movable excitation device which can realize the change of the vertical and horizontal excitation directions of a steel rail, can meet the requirements of the correlation analysis of excitation of different directions and different-order vibration of a specific steel rail, can quickly detect the corresponding damage of the steel rail, has strong practicability and is reliable to use for the modal test of the steel rail.
Background
In order to ensure the safety of the railway track structure, the track structure needs to be detected regularly; among the various items to be detected, the rail vibration test is an important detection link. The rail vibration test is used for obtaining the modal parameters of the rail, such as frequency, vibration mode, damping ratio and the like, and the service state of the rail is often judged through the modal parameters because the modal parameters can reflect the dynamics characteristics of the structure.
At present, the common steel rail modal experiment excitation test method mainly comprises the following steps: and after vibration information is acquired, the modal parameter which can reflect the dynamic characteristics of the structure is acquired by using a modal parameter identification method, so that the abnormal condition can be compared, and the maintenance is decided. The manual force hammer excitation is that the force hammer is vertically hammered to the steel rail through manual operation, and vibration information of the steel rail is obtained through a sensor arranged on the steel rail in advance; the method needs experienced personnel to operate, has low testing efficiency, and occupies a large amount of manpower and time cost. The driving excitation is that the train runs through the steel rail of the test section, and before running, a sensor is arranged on the steel rail in advance, and a vibration signal is acquired during the driving process through the sensor; meanwhile, in order to ensure the safety of the sensor, the sensor can be only arranged at the rail web of the steel rail and is connected with the steel rail through a clamp so as to acquire vibration information; because of the complex transmission path, the method can influence the test precision and has poor practicability. There is a need for an improved excitation device for rail modal testing in the prior art.
Disclosure of Invention
The invention aims at the problems, and provides the vehicle-mounted movable excitation device which can realize the change of the vertical and transverse excitation directions of the steel rail, can meet the requirements of the related analysis of excitation of different directions and different-order vibration of a specific steel rail, can quickly detect the corresponding damage of the steel rail, has strong practicability and is reliable in use and is used for the modal test of the steel rail.
The technical scheme adopted by the invention is as follows: the vehicle-mounted movable excitation device for the steel rail modal test comprises a movable base and is characterized in that: the vehicle-mounted driving mechanism is arranged on the moving base and comprises walking rollers arranged on two sides of the moving base, the walking rollers are rotationally connected with the moving base through roller rotating shafts, rotating shaft driving gears are arranged on the roller rotating shafts, and the rotating shaft driving gears are connected with output shafts of the walking driving motors; base lifting mechanisms are respectively arranged on two sides of the front end and the rear end of the movable base; and the two sides of the middle part of the movable base are symmetrically provided with overturning excitation mechanisms respectively, and the movable base is also provided with a hydraulic pump station and an exciter air supply system.
The movable base comprises a bearing frame, lifting mechanism mounting parts are respectively arranged at four corners of the bearing frame, and rotating shaft mounting holes are respectively arranged at two sides of the bearing frame; the two sides of the middle part of the bearing frame are respectively provided with a turnover avoidance opening, and the two sides of the turnover avoidance opening are respectively provided with a turnover limiting plate. The roller rotating shafts of the vehicle-mounted driving mechanisms are arranged in rotating shaft mounting holes of the bearing frame, and the lifting mechanisms of the bases are respectively arranged at lifting mechanism mounting parts at four corners of the bearing frame; and the overturning position of the overturning excitation mechanism is limited by an overturning limiting plate arranged at the overturning avoiding opening.
The base lifting mechanism comprises lifting supporting legs which are vertically arranged, wherein the upper ends and the middle parts of the lifting supporting legs are respectively provided with lifting connecting rods which are transversely arranged, one ends of the two lifting connecting rods are respectively hinged with the upper ends and the middle parts of the lifting supporting legs, and the other ends of the lifting connecting rods are respectively hinged with connecting rod hinge lug plates which are correspondingly arranged on the side parts of the movable base, so that a four-bar mechanism is formed; and still be provided with the lifting pneumatic cylinder between removal base and the lifting landing leg, the stiff end of lifting pneumatic cylinder articulates mutually with the articulated otic placode of lifting cylinder that removes base lateral part and set up, and the flexible end of lifting pneumatic cylinder then articulates mutually with the articulated pivot of lifting landing leg upper end. The four-bar mechanism formed by the two lifting connecting bars and the lifting supporting legs is driven to swing in a reciprocating manner by utilizing the expansion and contraction of the lifting hydraulic cylinders, so that the lower hem supporting and the upper hem retracting of the lifting supporting legs are realized.
The lifting support leg comprises a support leg main body, and connecting rod hinge holes are respectively formed in the upper end and the middle of the support leg main body; the lower extreme of landing leg main part still is provided with extension board articulated portion, and extension board articulated portion articulates and is provided with the ground connection board. The lifting support legs are hinged with the end parts of the two lifting connecting rods through connecting rod hinge holes respectively arranged at the upper ends and the middle parts of the support leg main bodies, and the ground connection support plates arranged at the lower ends of the support leg main bodies are used for forming stable contact with the ground.
The lifting connecting rod comprises a connecting rod main body, one end of the connecting rod main body is provided with a supporting leg hinge part, and the supporting leg hinge part is hinged with a connecting rod hinge hole on the lifting supporting leg; the other end of the connecting rod main body is provided with a base frame hinging part, and the base frame hinging part is hinged with a connecting rod hinging lug plate at the side part of the movable base. The four-bar mechanism capable of swinging in a reciprocating manner is formed by utilizing two lifting connecting bars which are transversely arranged at the side part of the movable base and are respectively hinged with the upper end and the middle part of the lifting supporting leg, so that the lifting of the movable base by the base lifting mechanism is facilitated in the process of carrying out modal excitation test on the test steel rail.
The connecting rod is characterized in that one end of the connecting rod body, which is provided with the supporting leg hinge part, is narrow, and the other end of the connecting rod body, which is provided with the base frame hinge part, is wide. The structural strength of the lifting connecting rod is increased through the trapezoid structure with one wide end and the other narrow end of the connecting rod main body, and the supporting stability of the base lifting mechanism is ensured.
The turnover excitation mechanism comprises a turnover plate arranged on the bearing plate, one end of the turnover plate is rotatably connected with a turnover plate hinge part arranged at the turnover opening, a turnover hydraulic cylinder is arranged between the upper side of the turnover plate and the middle part of the bearing plate, one end of the turnover hydraulic cylinder is hinged with the turnover plate, and the other end of the turnover hydraulic cylinder is hinged with a turnover cylinder hinge lug plate in the middle part of the bearing plate; and the lower side of the turnover plate is also provided with a pneumatic vibration exciter. The overturning plate is driven to overturn up and down around the overturning plate hinge part by utilizing the expansion and contraction of the overturning hydraulic cylinder, so that the posture of a pneumatic vibration exciter arranged on the lower side of the overturning plate is changed, and further the change of the vertical and transverse excitation directions of the test steel rail is realized.
The pneumatic vibration exciter is arranged at the lower end of the connecting vertical arm, and the upper end of the connecting vertical arm is connected with the vertical arm sliding rail in a sliding way; the vertical arm sliding rail is fixedly connected with the turning plate sliding block, and the turning plate sliding block is arranged on the turning plate sliding rail at the lower side of the turning plate in a sliding manner; the turning plate sliding rail and the vertical arm sliding rail are mutually perpendicular; and the turning plate sliding block and the connecting vertical arm are respectively provided with a sliding block locking mechanism for locking the sliding position. The excitation position of the pneumatic vibration exciter arranged at the lower end of the connecting vertical arm is flexibly adjusted by freely sliding the turning plate sliding rail and the connecting vertical arm on the turning plate sliding rail and the vertical arm sliding rail which are arranged vertically to each other, so that the device is convenient to use.
The connecting vertical arm is L-shaped, one section of the connecting vertical arm is bent and connected with the vertical arm sliding rail in a sliding way, and the other section of the connecting vertical arm is connected with the pneumatic vibration exciter at the end part. So that the pneumatic vibration exciter arranged at the end part of the connecting vertical arm can be fully suitable for different vertical or transverse working conditions along with the turning plate.
The end parts of the turning plate sliding rail and the vertical arm sliding rail are respectively provided with a limiting block. So as to limit the positions of the turning plate sliding block and the connecting vertical arm moving on the turning plate sliding rail and the vertical arm sliding rail and prevent the turning plate sliding block and the connecting vertical arm from sliding out of the rail.
The invention has the beneficial effects that: because the invention adopts the movable base on which the vehicle-mounted driving mechanism is arranged, the vehicle-mounted driving mechanism comprises the walking rollers arranged on two sides of the movable base, the walking rollers are rotationally connected with the movable base through the roller rotating shafts, the roller rotating shafts are provided with rotating shaft driving gears, and the rotating shaft driving gears are connected with the output shafts of the walking driving motors; base lifting mechanisms are respectively arranged at the two sides of the front end and the rear end of the movable base; the two sides of the middle part of the movable base are symmetrically provided with the overturning excitation mechanisms respectively, and the movable base is provided with the structural forms of the hydraulic pump station and the air supply system of the vibration exciter, so that the movable base is reasonable in design and compact in structure, can realize the vertical and transverse excitation direction change of the steel rail, can meet the requirements of the related analysis of excitation of different directions and different-order vibration of the specific steel rail, can quickly detect the corresponding damage of the steel rail, and is high in practicability and reliable in use. The test object of the vehicle-mounted movable excitation device is a steel rail with a specific rail type, and the maximum amplitude of the steel rail under a certain vibration frequency can be known by providing sweep frequency vibration, wherein the vibration frequency is the natural frequency of the steel rail; and comparing the natural frequency detected by vibration with the natural frequency of the standard steel rail, so as to judge whether the steel rail has corresponding faults in a certain section.
Drawings
Fig. 1 is a schematic structural view of the present invention (the inversion excitation mechanism is in a vertical excitation operation state).
FIG. 2 is a schematic view of the lower structure of FIG. 1 with the upper roll-over excitation mechanism, hydraulic pump station, and exciter air supply system removed.
Fig. 3 is a schematic view of a structure of the moving base in fig. 2.
Fig. 4 is a schematic view of a structure of the base lifting mechanism in fig. 2.
Fig. 5 is an a-direction view of fig. 4.
Fig. 6 is a schematic view of one configuration of the lifting leg of fig. 4.
Fig. 7 is a schematic view of a construction of the lifting link of fig. 4.
Fig. 8 is a schematic structural view of the reverse excitation mechanism in fig. 1.
Fig. 9 is a B-direction view of fig. 8.
Fig. 10 is a schematic view of an embodiment of the inversion excitation mechanism of fig. 1 in a laterally excited operational state.
Fig. 11 is a flow chart of the control system of the present invention.
Fig. 12 is a graph of modal frequency acceleration amplitude for a rail in accordance with the present invention.
The serial numbers in the figures illustrate: the device comprises a moving base, a 2 vehicle-mounted driving mechanism, a 3 base lifting mechanism, a 4 turnover excitation mechanism, a 5 hydraulic pump station, a 6 vibration exciter air supply system, a 7 test steel rail, 8 walking rollers, 9 roller shafts, a 10 rotation shaft driving gear, a 11 speed sensor, a 12 turnover limiting plate, a 13 bearing frame, a 14 lifting mechanism mounting part, a 15-connecting-rod hinge lug plate, a 16 lifting-cylinder hinge lug plate, a 17 rotation shaft mounting hole, an 18 turnover avoidance gap, a 19-lifting connecting rod, a 20-lifting supporting leg, a 21-grounding support plate, a 22-lifting hydraulic cylinder, a 23-supporting-leg main body, a 24-connecting-rod hinge hole, a 25-supporting-plate hinge part, a 26-connecting-rod main body, a 27-supporting-leg hinge part, a 28-base frame hinge part, a 29 bearing plate, a 30 turnover opening, a 31 turnover plate, a 32 turnover hydraulic cylinder, a 33 turnover-cylinder hinge lug plate, a 34 turnover slide rail, a 35 turnover slide block, a 36 slide block locking mechanism, a 37 vertical-arm slide rail, a 38-connecting vertical arm, a 39 pneumatic excitation device, a 40 pneumatic triplet, a 41 turnover hinge part and a 42 limiting block.
Detailed Description
The specific structure of the present invention will be described in detail with reference to fig. 1 to 10. The vehicle-mounted movable excitation device for the steel rail modal test comprises a movable base 1 capable of moving on a test steel rail 7, and a vehicle-mounted driving mechanism 2 is arranged on the movable base 1. The vehicle-mounted driving mechanism 2 comprises four walking rollers 8 arranged on two sides of the movable base 1, two corresponding walking rollers 8 are connected through a roller rotating shaft 9, and the roller rotating shaft 9 is rotationally connected with the movable base 1. Meanwhile, a rotating shaft driving gear 10 is arranged on the roller rotating shaft 9, and the rotating shaft driving gear 10 is connected with an output shaft of the walking driving motor; the running rollers 8 are respectively connected with the test steel rails 7 on the corresponding sides in a rolling way. In order to detect the running speed of the moving base 1, a rotating shaft driving gear 10 on the rotating shaft 9 of the roller is also meshed with a speed measuring gear at the input end of the speed sensor 11.
The movable base 1 is composed of a bearing frame 13, the bearing frame 13 adopts an integrated structure formed by bending profile steel, and a bearing plate 29 for arranging the overturning excitation mechanism 4, the hydraulic pump station 5 and the vibration exciter air supply system 6 is arranged on the upper side of the bearing frame 13. At four corners of the square bearing frame 13, lifting mechanism mounting portions 14 for arranging the base lifting mechanism 3 are respectively arranged, and two sides of the bearing frame 13 are respectively provided with rotating shaft mounting holes 17. The two sides of the middle part of the bearing frame 13 and the position where the overturning excitation mechanism 4 is arranged are respectively provided with overturning avoidance notches 18; the two sides of the overturning avoiding notch 18 are respectively provided with an overturning limiting plate 12. Thereby, the roller shafts 9 of the vehicle-mounted driving mechanism 2 are mounted in the shaft mounting holes 17 of the bearing frame 13, and the base lifting mechanisms 3 are respectively arranged at the lifting mechanism mounting portions 14 at the four corners of the bearing frame 13; and the overturning position of the overturning excitation mechanism 4 is limited by the overturning limiting plate 12 arranged at the overturning avoiding notch 18.
Four base lifting mechanisms 3 are respectively arranged on two sides of the front end and the rear end of the movable base 1. The base lifting mechanism 3 comprises lifting supporting legs 20 which are vertically arranged, wherein the upper ends and the middle parts of the lifting supporting legs 20 are respectively provided with lifting connecting rods 19 which are transversely arranged, one ends of the two lifting connecting rods 19 are respectively hinged with the upper ends and the middle parts of the lifting supporting legs 20, and the other ends of the lifting connecting rods 19 are respectively hinged with connecting rod hinge lug plates 15 which are correspondingly arranged on the side parts of the movable base 1, so that a four-bar mechanism is formed. Meanwhile, a lifting hydraulic cylinder 22 is further arranged between the movable base 1 and the lifting supporting legs 20, the fixed end of the lifting hydraulic cylinder 22 is hinged with a lifting cylinder hinged lug plate 16 arranged on the side part of the movable base 1, and the telescopic end of the lifting hydraulic cylinder 22 is hinged with a hinged rotating shaft at the upper end of the lifting supporting legs 20; each lifting hydraulic cylinder 22 is connected with a hydraulic pump station 5 arranged on the movable base 1 through a hydraulic pipeline. And the four-bar mechanism formed by the two lifting connecting rods 19 and the lifting supporting legs 20 is driven to swing reciprocally by utilizing the expansion and contraction of the lifting hydraulic cylinders 22, so that the lower swing support (the moving base 1 ascends, the walking roller 8 moves away from the test steel rail 7) or the upper swing retraction (the moving base 1 descends, and the walking roller 8 contacts the test steel rail 7) of the lifting supporting legs 20 is realized.
The lifting support leg 20 of the base lifting mechanism 3 is composed of a support leg main body 23, and connecting rod hinge holes 24 are respectively formed in the upper end and the middle of the support leg main body 23; the lower end of the leg body 23 is further provided with a support plate hinge portion 25, and the support plate hinge portion 25 is hinged with a ground connection support plate 21 so as to hinge the lifting leg 20 with the end portions of the two lifting connecting rods 19 through connecting rod hinge holes 24 respectively formed in the upper end and the middle of the leg body 23 and form stable contact with the ground by utilizing the ground connection support plate 21 formed in the lower end of the leg body 23.
The lifting link 19 of the base lifting mechanism 3 is composed of a link body 26, one end of the link body 26 is provided with a leg hinge portion 27, and the lifting link 19 is hinged with a link hinge hole 24 at the upper end or middle part of the lifting leg 20 through the leg hinge portion 27. The other end of the connecting rod main body 26 is provided with a base frame hinging part 28, and the lifting connecting rod 19 is hinged with the connecting rod hinging lug plate 15 at the side part of the movable base 1 through the base frame hinging part 28; and further, two lifting connecting rods 19 which are transversely arranged at the side part of the movable base 1 and are respectively hinged with the upper end and the middle part of the lifting supporting leg 20 are utilized to form a four-bar mechanism capable of swinging reciprocally, so that the lifting of the movable base 1 by the base lifting mechanism 3 is facilitated in the process of carrying out modal excitation test on the test steel rail 7. The structure of one end of the lifting connecting rod 19, which is provided with the supporting leg hinging part 27, is narrower, and the structure of the other end of the lifting connecting rod 19, which is provided with the base frame hinging part 28, is wider; thereby, the structural strength of the lifting link 19 is increased by the trapezoid structure with one wide end and the other narrow end of the link body 26, and the supporting stability of the base lifting mechanism 3 is ensured.
The two sides of the middle part of the movable base 1 are symmetrically provided with turnover excitation mechanisms 4 respectively, the turnover excitation mechanisms 4 comprise turnover plates 31 arranged on a bearing plate 29 at the upper side of the movable base 1, and one end of each turnover plate 31 is rotatably connected with a turnover plate hinge part 41 arranged at a turnover opening 30 on the bearing plate 29; two groups of overturning hydraulic cylinders 32 are arranged between the upper side of the overturning plate 31 and the middle part of the bearing plate 29, one end of each overturning hydraulic cylinder 32 is hinged with the overturning plate 31, and the other end of each overturning hydraulic cylinder 32 is hinged with an overturning cylinder hinging lug plate 33 in the middle part of the bearing plate 29; each overturning hydraulic cylinder 32 is connected with a hydraulic pump station 5 arranged on the movable base 1 through a hydraulic pipeline. The lower side of the turnover plate 31 is also provided with a pneumatic vibration exciter 39 (for example, an FP-12-M type pneumatic vibration exciter); the overturning plate 31 is driven to overturn up and down (overturn from vertical to horizontal by 90 degrees) around the overturning plate hinge part 41 by utilizing the expansion and contraction of the overturning hydraulic cylinder 32, so that the posture of the pneumatic vibration exciter 39 arranged on the lower side of the overturning plate 31 is changed, the conversion of vertical and horizontal excitation of the pneumatic vibration exciter 39 is further satisfied, and the change of the vertical and horizontal excitation directions of the test steel rail 7 is realized.
The pneumatic vibration exciter 39 is arranged at the lower end of the connecting vertical arm 38, the connecting vertical arm 38 is L-shaped, one section of bending at the upper end is slidably connected with the vertical arm sliding rail 37, the other section of bending at the lower end is connected with the pneumatic vibration exciter 39 through a flange, and an air supply pipeline of the pneumatic vibration exciter 39 is connected with the vibration exciter air supply system 6 arranged on the movable base 1 through a pneumatic triplet 40; further, the pneumatic vibration exciter 39 arranged at the end part of the L-shaped connecting vertical arm 38 can be fully adapted to different vertical or transverse working conditions along with the overturning of the overturning plate 31. The vertical arm slide rail 37 is fixedly connected with the flap slide block 35, and the flap slide block 35 is slidably disposed on the flap slide rail 34 below the flap plate 31. The turning plate slide rail 34 and the vertical arm slide rail 37 are arranged vertically; the flap slider 35 and the connecting arm 38 are provided with slider locking mechanisms 36 (shown in fig. 8 and 9) for locking the sliding positions thereof on the flap slide rail 34 and the arm slide rail 37, respectively. And furthermore, the excitation position of the pneumatic vibration exciter 39 at the lower end of the connecting vertical arm 38 is flexibly adjusted by freely sliding the turning plate sliding block 35 and the connecting vertical arm 38 on the turning plate sliding rail 34 and the vertical arm sliding rail 37 which are arranged vertically to each other, so that the device is convenient to use. The end parts of the turning plate slide rail 34 and the vertical arm slide rail 37 are respectively provided with a limiting block 42 to limit the moving positions of the turning plate slide block 35 and the connecting vertical arm 38 on the turning plate slide rail 34 and the vertical arm slide rail 37, so that the turning plate slide rail 34 and the vertical arm slide rail 37 are prevented from sliding out of the track, and the use reliability of the device is ensured.
When the vehicle-mounted movable excitation device for the steel rail modal test is used, firstly, a traveling driving motor is started, and the vehicle-mounted driving mechanism 2 is driven to drive the movable base 1 to move forwards at a constant speed for a certain distance (for example, 100 meters) along the test steel rail 7 and then stop; at this time, the lifting legs 20 of the four base lifting mechanisms 3 are in an initial state of upward swing retraction (the running roller 8 is in rolling contact with the test steel rail 7), and the two overturning and exciting mechanisms 4 are in an initial state of vertical excitation (as shown in fig. 1). After the movable base 1 is stopped, the lifting hydraulic cylinder 22 extending out of the base lifting mechanism 3 drives the lifting support leg 20 to swing downwards to support through a four-bar mechanism consisting of two lifting connecting bars 19 and the lifting support leg 20, so that the movable base 1 is lifted upwards (the walking roller 8 and the test steel rail 7 are separated from each other, and the influence on excitation test is avoided). Then, the vertical excitation position of the pneumatic vibration exciter 39 is adjusted through the free sliding of the turning plate sliding block 35 and the connecting vertical arm 38 on the turning plate sliding rail 34 and the vertical arm sliding rail 37 respectively, so that the vibration exciter is contacted with the outer side surface of the steel rail, and the sliding block locking mechanism 36 is locked; then, the pneumatic vibration exciter 39 is turned on, and the vertical excitation test is performed on the test rail 7 (where it stays) by applying a force at a certain frequency.
After the vertical excitation test of the position test steel rail 7 is finished, the positions of the turning plate sliding block 35 and the connecting vertical arm 38 are adjusted, so that the vertical and horizontal distances between the pneumatic vibration exciter 39 and the steel rail are increased, and the subsequent turning and reversing are facilitated. Subsequently, the inversion plate 31 of the inversion excitation mechanism 4 is driven to invert downward (to invert 90 ° from vertical to horizontal) around the inversion hinge 41 by the inversion hydraulic cylinder 32, thereby changing the pneumatic exciter 39 on the lower side of the inversion plate 31 to the lateral excitation posture (as shown in fig. 10). The transverse excitation position of the pneumatic vibration exciter 39 is adjusted and locked by the turning plate slide block 35 and the connecting vertical arm 38 again, the pneumatic vibration exciter 39 is started, and the transverse excitation test is carried out on the test steel rail 7 by applying force according to a certain frequency. After the transverse excitation test of the position test steel rail 7 is completed, the lifting legs 20 of the four base lifting mechanisms 3 swing upwards to be retracted to an initial state, so that the walking roller 8 is contacted with the test steel rail 7, and the two overturning excitation mechanisms 4 are overturned upwards to return to an initial vertical excitation posture; and then prepares for the next working cycle of moving the base 1 forward, supporting the base lifting mechanism 3 and exciting the test by the overturning excitation mechanism 4.
Through excitation of the test steel rail and data acquisition analysis of a plurality of acquisition points, a frequency acceleration amplitude curve (shown in fig. 12) of the test steel rail can be obtained, and the frequency corresponding to the peak value of the curve is the self-vibration frequency of the test steel rail. And then comparing the self-vibration frequency detected by vibration with the self-vibration frequency of the standard steel rail, and judging whether the test steel rail has faults in a certain section. The vehicle-mounted movable excitation device can realize simultaneous excitation of two steel rails, can automatically switch along the vertical and transverse excitation forces and sweep vibration, and can conveniently realize the modal test of the steel rails.
Claims (8)
1. Vehicle-mounted movable excitation device for steel rail modal testing, comprising a movable base (1), and being characterized in that: the vehicle-mounted driving mechanism (2) is arranged on the moving base (1), the vehicle-mounted driving mechanism (2) comprises walking rollers (8) arranged on two sides of the moving base (1), the walking rollers (8) are rotationally connected with the moving base (1) through roller rotating shafts (9), rotating shaft driving gears (10) are arranged on the roller rotating shafts (9), and the rotating shaft driving gears (10) are connected with output shafts of the walking driving motors; base lifting mechanisms (3) are respectively arranged at the two sides of the front end and the rear end of the movable base (1); in addition, two sides of the middle part of the movable base (1) are symmetrically provided with overturning excitation mechanisms (4), and the movable base (1) is also provided with a hydraulic pump station (5) and an exciter air supply system (6); the base lifting mechanism (3) comprises lifting supporting legs (20) which are vertically arranged, lifting connecting rods (19) which are transversely arranged are respectively arranged at the upper ends and the middle parts of the lifting supporting legs (20), one ends of the two lifting connecting rods (19) are respectively hinged with the upper ends and the middle parts of the lifting supporting legs (20), and the other ends of the lifting connecting rods (19) are respectively hinged with connecting rod hinge lug plates (15) which are correspondingly arranged on the side parts of the movable base (1), so that a four-bar mechanism is formed; a lifting hydraulic cylinder (22) is further arranged between the movable base (1) and the lifting support leg (20), the fixed end of the lifting hydraulic cylinder (22) is hinged with a lifting cylinder hinge lug plate (16) arranged on the side part of the movable base (1), and the telescopic end of the lifting hydraulic cylinder (22) is hinged with a hinge rotating shaft at the upper end of the lifting support leg (20); the turnover excitation mechanism (4) comprises a turnover plate (31) arranged on the bearing plate (29), one end of the turnover plate (31) is rotatably connected with a turnover plate hinge part (41) arranged at the turnover opening (30), a turnover hydraulic cylinder (32) is arranged between the upper side of the turnover plate (31) and the middle part of the bearing plate (29), one end of the turnover hydraulic cylinder (32) is hinged with the turnover plate (31), and the other end of the turnover hydraulic cylinder (32) is hinged with a turnover cylinder hinge lug plate (33) at the middle part of the bearing plate (29); the lower side of the turnover plate (31) is also provided with a pneumatic vibration exciter (39); the overturning plate (31) is driven to overturn up and down around the overturning plate hinge part (41) by utilizing the expansion and contraction of the overturning hydraulic cylinder (32), namely: the device is turned over from the vertical direction to the horizontal direction by 90 degrees, so that the posture of a pneumatic vibration exciter (39) arranged on the lower side of the turning plate (31) is changed, the conversion of vertical and horizontal excitation of the pneumatic vibration exciter (39) is further met, and the change of the vertical and horizontal excitation directions of the test steel rail (7) is realized.
2. The vehicle-mounted mobile excitation device for rail modal testing according to claim 1, wherein: the movable base (1) comprises a bearing frame (13), lifting mechanism mounting parts (14) are respectively arranged at four corners of the bearing frame (13), and rotating shaft mounting holes (17) are respectively arranged at two sides of the bearing frame (13); the two sides of the middle part of the bearing frame (13) are also respectively provided with a turnover avoidance gap (18), and two sides of the turnover avoidance gap (18) are respectively provided with a turnover limiting plate (12).
3. The vehicle-mounted mobile excitation device for rail modal testing according to claim 1, wherein: the lifting support leg (20) comprises a support leg main body (23), and connecting rod hinge holes (24) are respectively formed in the upper end and the middle of the support leg main body (23); the lower end of the supporting leg main body (23) is also provided with a supporting plate hinge part (25), and the supporting plate hinge part (25) is hinged with a grounding supporting plate (21).
4. A vehicle-mounted mobile excitation device for rail modal testing according to claim 3, wherein: the lifting connecting rod (19) comprises a connecting rod main body (26), one end of the connecting rod main body (26) is provided with a supporting leg hinge part (27), and the supporting leg hinge part (27) is hinged with a connecting rod hinge hole (24) on the lifting supporting leg (20); the other end of the connecting rod main body (26) is provided with a base frame hinging part (28), and the base frame hinging part (28) is hinged with a connecting rod hinging lug plate (15) at the side part of the movable base (1).
5. The vehicle-mounted mobile excitation device for rail modal testing according to claim 4, wherein: the connecting rod main body (26) is narrow at one end provided with the supporting leg hinge part (27), and is wide at the other end provided with the base frame hinge part (28) on the connecting rod main body (26).
6. The vehicle-mounted mobile excitation device for rail modal testing according to claim 1, wherein: the pneumatic vibration exciter (39) is arranged at the lower end of the connecting vertical arm (38), and the upper end of the connecting vertical arm (38) is slidably connected with the vertical arm sliding rail (37); the vertical arm sliding rail (37) is fixedly connected with the turning plate sliding block (35), and the turning plate sliding block (35) is arranged on the turning plate sliding rail (34) at the lower side of the turning plate (31) in a sliding manner; the turning plate sliding rail (34) and the vertical arm sliding rail (37) are arranged vertically; the turning plate sliding block (35) and the connecting vertical arm (38) are respectively provided with a sliding block locking mechanism (36) for locking the sliding position.
7. The vehicle-mounted mobile excitation device for rail modal testing according to claim 6, wherein: the connecting vertical arm (38) is L-shaped, one section of the connecting vertical arm is bent and is in sliding connection with the vertical arm sliding rail (37), and the other section of the connecting vertical arm is connected with the pneumatic vibration exciter (39).
8. The vehicle-mounted mobile excitation device for rail modal testing according to claim 6, wherein: the end parts of the turning plate sliding rail (34) and the vertical arm sliding rail (37) are respectively provided with a limiting block (42).
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| CN202210598292.8A CN114923987B (en) | 2022-05-30 | 2022-05-30 | Vehicle-mounted movable excitation device for steel rail modal test |
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| CN202210598292.8A CN114923987B (en) | 2022-05-30 | 2022-05-30 | Vehicle-mounted movable excitation device for steel rail modal test |
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| CN114923987B true CN114923987B (en) | 2024-05-07 |
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| CN114923987A (en) | 2022-08-19 |
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Effective date of registration: 20240911 Address after: 230000 B-1015, wo Yuan Garden, 81 Ganquan Road, Shushan District, Hefei, Anhui. Patentee after: HEFEI MINGLONG ELECTRONIC TECHNOLOGY Co.,Ltd. Country or region after: China Address before: No.25, Hunnan Middle Road, Hunnan District, Shenyang City, Liaoning Province Patentee before: SHENYANG JIANZHU University Country or region before: China |