A vibration test bench of ballast track dynamic stabilizing device

Abstract

The application discloses a vibration test bed of a ballast track dynamic stabilizing device, which comprises a ballast box embedded in the ground, a gravel track bed in the ballast box, concrete sleepers laid on the gravel track bed, steel rails installed on the concrete sleepers and the dynamic stabilizing device arranged on the steel rails; the dynamic stabilizing device comprises track wheels, a base plate, a main shaft, adjustable clamping arm mechanisms, a vibration exciting device, a downward pressing adjusting mechanism, the vibration exciting device is installed at the center of the base plate, the two adjustable clamping arm mechanisms are installed on the base plate and located on the two sides of the vibration exciting device, and the downward pressing adjusting mechanism is installed on the base plate and the ballast box and located above the vibration exciting device; the test bed can test the influence of the dynamic stabilizing vehicle on the sleeper or ballast subsidence, sleeper abrasion, spring fastener fatigue and the influence degree through the speed regulation of the speed regulation motor, the clamping force regulation of the adjustable clamping arm mechanisms and the pressure regulation of the downward pressing adjusting mechanism, and can provide data support for the maintenance of the ballast track bed and the vibration research of the dynamic stabilizing vehicle.

Description

TECHNICAL FIELD

[0001] The present application relates to a vibration test bench, in particular to a vibration test bench with ballast track dynamic stabilizing device. BACKGROUND

[0002] The dynamic stabilizing vehicle is a large-scale railway maintenance machine for improving the lateral resistance of the line and the overall stability of the track bed after the large and medium repair and new repair of the railway line. Such maintenance machine belongs to large industrial equipment. In the test, due to the complex terrain and other uncontrollable and uncertain factors, the test data deviation is large, and the retest repeatability is low.

[0003] In the actual stabilizing operation of the dynamic stabilizing vehicle, the stabilizing effect of the track bed in the stabilizing process is more from experience, and the test data is single. In view of the core component of the dynamic stabilizing vehicle, i.e. the dynamic stabilizing device, an experimental platform for testing the dynamic stabilizing device is established from the perspective of test experiment, mainly testing the influence of the down pressure, the excitation frequency, the clamping force, the positioning angle on the track bed stability in the operation process, and also testing the parameters such as the settlement of the sleeper, the wear of the ballast and the track bed contact force. It has important significance for the research and development, performance evaluation and improvement of the railway maintenance machine represented by the dynamic stabilizing vehicle. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a vibration test bench for ballast track dynamic stabilizing device, which is practical and reliable, can test the influence of different factors on the stabilizing effect, has high economic efficiency, good repeatability and simple operation.

[0005] The vibration test bench for ballast track dynamic stabilizing device of the present application comprises a ballast box embedded in the ground, a gravel track bed accumulated in the ballast box, three or more concrete sleepers with the same spacing horizontally laid on the gravel track bed, two parallel steel rails installed on the concrete sleepers through spring fasteners, and a dynamic stabilizing device arranged on the steel rails. The dynamic stabilizing device comprises a track wheel, a base plate, a main shaft, an adjustable clamping arm mechanism, an excitation device and a down pressure adjusting mechanism. Two or more main shafts are fixed at the bottom of the base plate, the track wheel is arranged at the end of the two or more main shafts through a rolling bearing, and the track wheel is arranged on the steel rails and rolls with the steel rails. The excitation device is installed at the center of the base plate, two adjustable clamping arm mechanisms are installed on the base plate and located on both sides of the excitation device, and the down pressure adjusting mechanism is installed on the base plate and the ballast box and located above the excitation device.

[0006] In the present application, the main factors affecting the settlement of the ballast bed are the downward pressure applied to the sleepers, the lateral excitation frequency of the dynamic stabilizing device, the clamping force of the clamping mechanism, the angle of the positioning block, etc. Thus, by adjusting the pressure device to apply different downward pressures to the sleepers, by adjusting the exciter through the speed regulating motor to apply different frequencies, and finally by adjusting the clamping force and the angle of the positioning block through the clamping mechanism, the settlement of the ballast bed, the wear of the sleepers, the fatigue of the spring fasteners, etc. are tested under the influence of multiple factors.

[0007] The excitation device comprises a double-shaft eccentric block exciter, an exciter base, an upper transmission gear, a lower transmission gear, an exciter flange, a motor flange, a universal shaft coupling, a speed regulating motor, and a motor base. The motor base is fixed to the ground on one side of the ballast box, the speed regulating motor is fixed to the motor base, the output shaft of the speed regulating motor is connected to one end of the universal shaft coupling through the motor flange, the other end of the universal shaft coupling is fixed to the exciter flange, the exciter flange is connected to the lower end shaft of the double-shaft eccentric block exciter through a key, the other end of the lower end shaft of the double-shaft eccentric block exciter is connected to the lower transmission gear through a key, the lower transmission gear is engaged with the upper transmission gear fixed to the upper end shaft of the double-shaft eccentric block exciter, the double-shaft eccentric block exciter is fixed in the exciter base, the exciter base is fixed to the center of the base plate, and a screw is arranged on the upper part of the exciter base through a nut to fasten the double-shaft eccentric block exciter.

[0008] A spring stopper is arranged at the small diameter end of the lower end shaft and the upper end shaft of the double-shaft eccentric block exciter to prevent the axial displacement of the gear. Rubber pads are arranged between the exciter flange, the motor flange, and the universal shaft coupling. The double-shaft eccentric block exciter is used to rotate the two shafts in opposite directions through the gear to achieve the cancellation of the up-down vibration and output only the lateral vibration. The use of the universal shaft coupling also greatly reduces the damage of the exciter to the speed regulating motor.

[0009] The adjustable clamping arm mechanism comprises a wing plate, a screw sleeve connector, a screw sleeve, a screw, an intermediate connector, a clamping arm, and a positioning block. The wing plate is fixed to the base plate and located on one side of the exciter base. One end of the screw sleeve connector is rotatably connected to the wing plate, and the other end is rotatably connected to the cylindrical head of one end of the screw sleeve. One end of the screw is arranged in the screw sleeve and threadedly connected to the screw sleeve. The other end of the screw is rotatably connected to one end of the intermediate connector. The middle part of the intermediate connector is rotatably connected to the wing plate. The other end of the intermediate connector is fixedly connected to the clamping arm. The clamping arm is fixedly connected to the positioning block, which is located on the outside of the rail head of the steel rail. The screw sleeve is internally formed with a rectangular thread. The screw can be extended outward by rotating the screw sleeve to provide different clamping forces. Moreover, the use of the rectangular thread can achieve better self-locking during the operation of the test bench.

[0010] The lower pressing adjusting mechanism comprises four sleeve I, four sleeve II, four compression springs, four adjusting units, two square tube frames and an upper top plate, wherein the adjusting unit comprises a nut sleeve rod, a stepped screw rod, an upper support cover, an upper support base, a lower support cover, a lower support base, a support base bottom plate, an intermediate plate and a rear channel steel, the support base bottom plate, the intermediate plate and the rear channel steel are fastened and connected through bolts, and are then fixed on the side wall of the ballast box through the support base bottom plate and the rear channel steel, the upper support base and the lower support base are respectively fixed at the upper end and the lower end of the support base bottom plate, the upper support cover and the lower support cover are respectively arranged on the upper support base and the lower support base, one end of the stepped screw rod with a hexagonal nut is rotationally connected with the upper support base, and the other end is rotationally connected with the lower support base, and the nut sleeve rod is sleeved on the stepped screw rod and is threadedly connected with the stepped screw rod; one end of the two square tube frames is respectively fixed on the threaded sleeve rod of the four adjusting units, and the other end is fixedly connected with the upper top plate, the four sleeve II are fixed below the upper top plate, the four sleeve I are fixed on the base plate and correspond to the four sleeve II, and the two ends of the compression spring are respectively fixed in the sleeve I and the sleeve II.

[0011] By rotating the four stepped screw rods, the nut sleeve rods are horizontally and downwardly moved together, and the upper top plate connected through the square tube frames is also downwardly pressed to compress the compression spring and provide downward pressing force.

[0012] The data collection and analysis methods in the present application are conventional methods.

[0013] The present application has the following advantages:

[0014] The test bed can adjust the rotating speed of the speed regulating motor, the clamping force of the adjustable clamping arm mechanism and the pressure of the lower pressing adjusting mechanism, so as to test the influence and the influence degree of the power stabilization vehicle on the track sleeper or ballast sinking amount, the track sleeper wear, the spring fastener fatigue between the rail and the track sleeper under the action of different frequencies, different clamping forces and different downward pressing forces; and can provide data support for the maintenance of the ballast bed and the vibration research of the power stabilization vehicle on the basis of saving a large amount of resources.

[0015] The device of the present application has simple structure, convenient and reliable use, and is suitable for market promotion and application. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The figure is a structural schematic diagram of the device of the present application;

[0017] Figure 2 The figure is a structural schematic diagram of the adjustable clamping arm mechanism and the excitation device;

[0018] Figure 3 The figure is a structural schematic diagram of the double-rotating shaft eccentric block exciter;

[0019] Figure 4 The figure is a structural schematic diagram of the double-rotating shaft eccentric block exciter;

[0020] Figure 5 This is a schematic diagram of the substrate structure;

[0021] Figure 6 This is a schematic diagram of part of the adjustable clamping arm mechanism;

[0022] Figure 7 This is a schematic diagram of part of the downward pressure adjustment mechanism;

[0023] Figure 8 This is a schematic diagram of the adjustment unit structure;

[0024] In the diagram: 1-Battery box; 2-Rail; 3-Concrete sleeper; 4-Compression spring; 5-Intermediate connector; 6-Clamping arm; 7-Positioning block; 8-Rail wheel; 9-Sleeve I; 10-Base plate; 11-Motor mount; 12-Speed-regulating motor; 13-Motor flange; 14-Universal coupling; 15-Main shaft; 16-Vibrator flange; 17-Wing plate; 18-Double-shaft eccentric block vibrator; 19-Screw; 2 0-Vibrator base; 21-Upper drive gear; 22-Lower drive gear; 23-Screw sleeve connector; 24-Screw sleeve; 25-Screw; 26-Square tube frame; 27-Sleeve II; 28-Upper top plate; 29-Support base plate; 30-Intermediate plate; 31-Rear channel steel; 32-Upper support base; 33-Upper support cover; 34-Nut sleeve rod; 35-Stepped screw; 36-Lower support cover; 37-Lower support base. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, but the scope of protection of the present invention is not limited to the content described.

[0026] Example 1: As Figures 1-8As shown, the vibration test bench for the dynamic stabilization device of this ballasted track includes a ballast box 1 embedded in the ground, containing a piled-up crushed stone track bed. Three concrete sleepers 3 are laid horizontally on the crushed stone track bed with equal spacing. Two parallel steel rails 2 are installed on the concrete sleepers via spring fasteners. The dynamic stabilization device is mounted on the steel rails 2. The dynamic stabilization device includes track wheels 8, a base plate 10, main shafts 15, an adjustable clamping arm mechanism, a vibration excitation device, and a downward adjustment mechanism. Two main shafts 15 are welded and fixed to the bottom of the base plate 10. Four track wheels 8 are mounted on the ends of the two main shafts 15 via rolling bearings. The track wheels 8 are mounted on the steel rails 2 and roll in cooperation with them. The vibration excitation device is installed at the center of the base plate 10. The vibration excitation device includes a dual-shaft eccentric block vibrator 18, a vibrator base 20, an upper transmission gear 21, a lower transmission gear 22, a vibrator flange 16, a motor flange 13, a universal joint coupling 14, a speed-regulating motor 12, and a motor base 11. The motor base 11 is fixed to the ground on one side of the ballast box by expansion bolts. The speed-regulating motor 12 is fixed to the motor base 11 by bolts. The output shaft of the speed-regulating motor 12 is connected to the motor flange 13 by a key. The motor flange 13 is connected to one end of the universal joint coupling 14 by bolts. The other end of the universal joint coupling is fixed to the vibrator flange 16 by bolts. The vibrator flange 16 is connected to the lower main shaft of the dual-shaft eccentric block vibrator 18 by a key. The lower end of the main shaft of the dual-shaft eccentric vibrator 18 is connected to the lower transmission gear 22 via a flat key. The lower transmission gear 22 meshes with the upper transmission gear 21 fixed on the upper main shaft of the dual-shaft eccentric vibrator 18. Spring baffles are provided at the small diameter of the shaft ends of the lower and upper main shafts of the dual-shaft eccentric vibrator 18 to prevent axial displacement of the gears. Rubber pads are provided between the vibrator flange 16, the motor flange 13 and the universal joint coupling. The dual-shaft eccentric vibrator 18 is fixed in the vibrator base 20 by bolts. The vibrator base 20 is fixed to the center of the base plate 10 by bolts. The screw 19 is provided on the upper part of the vibrator base 20 with a nut to fasten the dual-shaft eccentric vibrator.

[0027] Two adjustable clamping arm mechanisms are mounted on the base plate 10 and located on both sides of the excitation device. The adjustable clamping arm mechanism includes a wing plate 17, a screw sleeve connector 23, a screw sleeve 24, a screw 25, an intermediate connector 5, a clamping arm 6, and a positioning block 7. The wing plate 17 is fixed on the base plate 10 and located on one side of the exciter base 20. One end of the screw sleeve connector 23 is rotatably connected to the wing plate 17, and the other end is rotatably connected to the cylindrical head of one end of the screw sleeve 24. The screw sleeve has a rectangular thread inside. One end of the screw 25 is set inside the screw sleeve 24 and is engaged with the rectangular thread of the screw sleeve. The other end of the screw 25 is rotatably connected to the bolt hole at one end of the intermediate connector 5. The bolt hole in the middle of the intermediate connector 5 is rotatably connected to the wing plate 17. The other end of the intermediate connector 5 is fixedly connected to the clamping arm 6. The clamping arm 6 is fixedly connected to the positioning block 7 by bolts. The positioning block 7 is pressed against the outside of the rail head of the rail 2.

[0028] The downward pressure adjustment mechanism is installed on the base plate and ballast box and located above the excitation device. The downward pressure adjustment mechanism includes four sleeves I9, four sleeves II27, four compression springs 4, four adjustment units, two square tube frames 26, and an upper top plate 28. The adjustment unit includes a nut sleeve rod 34, a stepped screw rod 35, an upper support cover 33, an upper support seat 32, a lower support cover 36, a lower support seat 37, a support seat base plate 29, an intermediate plate 30, and a rear channel steel 31. The support seat base plate 29, the intermediate plate 30, and the rear channel steel 31 are fastened together by bolts and then fixed to the side wall of the ballast box 1 by the support seat base plate and the rear channel steel. The upper support seat 32 and the lower support seat 37 are respectively fixed to the support seat base. At the upper and lower ends of plate 29, upper support cover 33 and lower support cover 36 are respectively mounted on upper support seat 32 and lower support seat 37 by bolts. One end of stepped screw rod 35 with hexagonal nut is rotatably connected to upper support seat, and the other end is rotatably connected to lower support seat 37. Nut sleeve rod 34 is fitted on stepped screw rod 35 and threadedly connected to it. One end of two square tube frames 26 is fixed on threaded sleeve rod 34 of four adjustment units, and the other end is fixedly connected to upper top plate 28. Four sleeves II 27 are welded and fixed below upper top plate 28. Four sleeves I 9 are welded and fixed on base plate and their positions correspond to the four sleeves II 27. Both ends of compression spring 4 are fixed inside sleeves I 9 and sleeves II 27 respectively.

[0029] When using the above-mentioned device, the ballast inside the ballast box 1 is first pre-treated, and piled into a standard crushed stone track bed according to railway standards. After the test bench is installed, the required clamping force is set. First, using a regular wrench, the screw sleeves on both sides of the clamping arm mechanism are rotated so that the clamping arm is positioned diagonally above the rail and can contact the rail through the rotating positioning block. The positioning block is adjusted to the required angle, and the positioning block is tightened to the clamping arm with bolts using a regular wrench. Since the clamping force is converted from the torque of the screw sleeve into axial force, Then, along the screw, intermediate connector, clamping arm, and positioning block, the force finally acts on the rail. Using the known angles between the positioning block and the rail, the clamping arm and the positioning block, the clamping arm and the intermediate connector, and the intermediate connector and the screw, the axial force of the screw sleeve corresponding to the set clamping force is calculated by theoretical mechanics. Then, using the formula for the relationship between axial force and torque, the torque of the screw sleeve is obtained. By using a torque wrench, the screw sleeve is rotated to make the screw extend axially outward, so that it reaches the preset torque, that is, the set clamping force is achieved.

[0030] After setting the clamping force, set the required downward pressure. Use a regular wrench to simultaneously rotate the stepped screws of the four adjustment units to lower the top plate horizontally to the original length of the compression spring. Based on the required downward pressure, obtain the downward displacement of the nut sleeve rod from the known spring stiffness. Then, calculate the number of rotations of the stepped screw from the screw pitch. Finally, use a regular wrench to simultaneously rotate the stepped screw to the required number of rotations to achieve the set downward pressure.

[0031] This vibration test bench also includes an accelerometer, a displacement sensor, a data acquisition card, a signal amplifier, and a computer. The accelerometer and displacement sensor are connected to the data acquisition card, which is connected to the computer via the signal amplifier. Six accelerometers and six displacement sensors are installed at the geometric center of the upper surface and sides of three sleepers. Other sensors can be added as needed for data acquisition.

[0032] After setting the downforce, start the speed-regulating motor and adjust it to the same speed as the set frequency by converting the frequency to the rotational speed. Then, data signal acquisition can begin. After the data information to be measured is acquired, turn off the speed-regulating motor and unload the downforce and clamping force. Based on different frequencies, clamping forces, and downforces, analyze the impact and degree of the dynamic stabilization vehicle on the settlement of sleepers or ballast, sleeper wear, and fatigue of spring fasteners between rails and sleepers.

Claims

1. A vibration test bench with a ballast track dynamic stabilization device, characterized in that: It includes a ballast box (1) embedded in the ground, which contains a pile of crushed stone track bed. Three or more concrete sleepers (3) with the same spacing are laid horizontally on the crushed stone track bed. Two parallel steel rails (2) are installed on the concrete sleepers by spring fasteners. A dynamic stabilizing device is set on the steel rails (2). The dynamic stabilization device includes a track wheel (8), a base plate (10), a main shaft (15), an adjustable clamping arm mechanism, an excitation device, and a pressure adjustment mechanism. Two or more main shafts (15) are fixed to the bottom of the base plate (10). The track wheel (8) is set at the ends of the two or more main shafts (15) through rolling bearings. The track wheel (8) is set on the rail (2) and rolls with it. The excitation device is installed at the center of the base plate (10). Two adjustable clamping arm mechanisms are installed on the base plate (10) and located on both sides of the excitation device. The pressure adjustment mechanism is installed on the base plate and the ballast box and located above the excitation device.

2. The vibration test bench for the ballasted track dynamic stabilization device according to claim 1, characterized in that: The vibration excitation device includes a double-shaft eccentric block vibrator (18), a vibrator base (20), an upper transmission gear (21), a lower transmission gear (22), a vibrator flange (16), a motor flange (13), a universal joint coupling (14), a speed-regulating motor (12), and a motor base (11). The motor base (11) is fixed on the ground on one side of the ballast box. The speed-regulating motor (12) is fixed on the motor base (11). The output shaft of the speed-regulating motor (12) is connected to one end of the universal joint coupling (14) through the motor flange (13). The other end of the universal joint coupling is fixed to the vibrator flange (16). The vibrator flange (16) is connected to the lower main shaft of the double-shaft eccentric block vibrator (18) by a flat key. The other end of the lower main shaft of the double-shaft eccentric vibrator (18) is connected to the lower transmission gear (22) by a flat key. The lower transmission gear (22) meshes with the upper transmission gear (21) fixed on the upper main shaft of the double-shaft eccentric block vibrator (18). The double-shaft eccentric vibrator (18) is fixed inside the vibrator base (20). The vibrator base (20) is fixed at the center of the base plate (10). The screw (19) is set on the upper part of the vibrator base (20) by a nut for fastening the double-shaft eccentric block vibrator.

3. The vibration test bench for the ballasted track dynamic stabilization device according to claim 2, characterized in that: The adjustable clamping arm mechanism includes a wing plate (17), a screw sleeve connector (23), a screw sleeve (24), a screw (25), an intermediate connector (5), a clamping arm (6), and a positioning block (7). The wing plate (17) is fixed on the base plate (10) and located on one side of the vibrator base (20). One end of the screw sleeve connector (23) is rotatably connected to the wing plate (17), and the other end is rotatably connected to the cylindrical head of one end of the screw sleeve (24). One end of the screw (25) is set inside the screw sleeve (24) and threadedly connected to the screw sleeve. The other end of the screw (25) is rotatably connected to one end of the intermediate connector (5). The middle part of the intermediate connector (5) is rotatably connected to the wing plate (17). The other end of the intermediate connector (5) is fixedly connected to the clamping arm (6). The clamping arm (6) is fixedly connected to the positioning block (7), and the positioning block (7) is pressed against the outside of the rail head of the rail (2).

4. The vibration test bench for the ballasted track dynamic stabilization device according to claim 3, characterized in that: The downward adjustment mechanism includes four sleeves I (9), four sleeves II (27), four compression springs (4), four adjustment units, two square tube frames (26), and an upper top plate (28). The adjustment unit includes a nut sleeve rod (34), a stepped screw rod (35), an upper support cover (33), an upper support seat (32), a lower support cover (36), a lower support seat (37), a support seat base plate (29), an intermediate plate (30), and a rear channel steel (31). The support seat base plate (29), the intermediate plate (30), and the rear channel steel (31) are fastened together by bolts and then fixed to the side wall of the ballast box (1) by the support seat base plate and the rear channel steel. The upper support seat (32) and the lower support seat (37) are respectively fixed to the upper and lower ends of the support seat base plate (29). At the same location, the upper support cover (33) and the lower support cover (36) are respectively set on the upper support seat (32) and the lower support seat (37). One end of the stepped screw (35) with a hexagonal nut is rotatably connected to the upper support seat, and the other end is rotatably connected to the lower support seat (37). The nut sleeve (34) is fitted on the stepped screw (35) and threadedly connected to it. One end of the two square tube frames (26) is fixed on the threaded sleeve (34) of the four adjustment units, and the other end is fixedly connected to the upper top plate (28). The four sleeves II (27) are fixed below the upper top plate (28). The four sleeves I (9) are fixed on the base plate and their positions correspond to the four sleeves II (27). The two ends of the compression spring (4) are fixed inside the sleeves I (9) and the sleeves II (27) respectively.

5. The vibration test bench for the ballast track dynamic stabilization device according to claim 2, characterized in that: Spring baffles are provided at the small diameter of the shaft ends of the lower and upper main shafts of the dual-shaft eccentric vibrator (18) to prevent axial displacement of the gears.

6. The vibration test bench for the ballast track dynamic stabilization device according to claim 2, characterized in that: A rubber pad is provided between the vibrator flange (16), the motor flange (13) and the universal joint coupling.

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