Rail transit wheel acoustic performance testing device

Abstract

The invention relates to the technical field of rail transit vehicle wheel acoustic testing, in particular to a rail transit wheel acoustic performance testing device which comprises a bottom supporting platform and a pendulum bob type excitation device, and the bottom supporting platform comprises a bottom supporting frame, longitudinal side stand columns welded and fixed to the two sides of the upper end of the bottom supporting frame and bottom universal wheels; the pendulum bob type excitation device comprises an installation stand column and an electric control pendulum bob which are fixed to the upper surface of the bottom supporting frame through bolts. The rail transit wheel acoustic performance testing device adopts a split type design and comprises five parts, namely a bottom supporting platform, a pendulum bob type excitation device, a suspension cross beam, an axle load applying clamp and a steel rail, and all the parts are connected through bolts, are convenient to assemble and transport and can be suitable for various testing environments; by adopting the adjustable pendulum excitation device, different positions of the wheel can be knocked, so that the testable range is greatly expanded, and the comprehensiveness of test data is improved.

Description

Technical Field

[0001] The invention relates to the technical field of rail transit vehicle wheel acoustic testing, in particular to a rail transit wheel acoustic performance testing device. Background Art

[0002] The acoustic performance test device is a special device for testing the acoustic performance of products. In the rail transit industry, the acoustic characteristics of a product can reflect its vibration reduction and noise reduction performance, and the vibration reduction and noise reduction performance of the product largely determines the ride comfort of rail transit vehicles. As the running parts of rail transit vehicles, the wheels are made of iron or steel, so the vibration and noise problems during operation cannot be ignored and have become an evaluation indicator in rail transit operations. For example, in Chongqing Rail Transit, many trains are built through residential buildings, which places very strict requirements on noise control during the operation of rail transit vehicles.

[0003] At present, the acoustic performance test of rail transit vehicle wheels is mainly carried out in a semi-anechoic chamber environment through a cantilever structure under the condition of no axle load. Moreover, the excitation method adopts the drop ball type, using the drop ball device to make the steel ball fall freely from the top of the slide and accelerate along the slide to hit the wheel rim. The impact point should be located on the center line of the wheel, and the impact directions are radial and axial respectively. This method has the following problems: (1) This test device can only test the wheel under the condition of no axle load; (2) There is a certain gap between the steel ball and the track. During the rolling process of the steel ball, the noise generated between it and the slide will also have a certain impact on the test results; (3) When the drop ball device is fixed, the point of each steel ball impact is still different, which ultimately leads to unreliable test results; (4) It is necessary to use the external semi-anechoic chamber environment, resulting in limited detection position; (5) It is impossible to simulate the impact of the moving wheel during operation. Summary of the invention

[0004] The technical problems to be solved by the present invention are: the testing device can only test the wheel without axle load; there is a certain gap between the steel ball and the track, and the noise generated between the steel ball and the slide during the rolling process will also have a certain impact on the test result; when the falling ball device is fixed, the points where the steel ball hits each time are still different, which ultimately leads to unreliable test results; it is necessary to use an external semi-anechoic room environment, which limits the detection position; and it is impossible to simulate the impact of the moving wheel during operation.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a rail transit wheel acoustic performance test device, including a bottom support platform and a pendulum excitation device, the bottom support platform includes a bottom support frame, longitudinal side columns welded and fixed on both sides of the upper end of the bottom support frame, and a bottom universal wheel; The pendulum-type excitation device includes a mounting column bolted to the upper surface of the bottom support frame and an electrically controlled pendulum; The upper surface of the bottom support frame is equipped with steel rails, the upper ends of the longitudinal side columns are equipped with hanging beams, and the upper surface of the bottom support frame is provided with axle weight applying fixtures on both sides of the steel rails; The upper end of the bottom support frame is located outside the longitudinal side column and is slidably equipped with an electrically controlled lifting sound insulation cover.

[0006] A top mounting seat for improving the stability of the bottom support of the suspension beam is welded and fixed on the upper end of the longitudinal side column, and the bottom universal wheel is movably assembled at the corner position of the lower end of the bottom support frame through a roller bracket.

[0007] The electric-controlled pendulum comprises a lateral swing arm movably mounted on the upper end of a mounting column via a top transverse axis, a lateral electric-controlled pendulum fixed on the lower end of the lateral swing arm, and a magnetically controlled regulating limiting mechanism mounted on the side wall of the mounting column.

[0008] The lateral electric-controlled pendulum comprises a lateral assembly frame fixedly mounted on the lower end of the lateral swing arm, a transverse electric-controlled lead screw movably mounted inside the lateral assembly frame, an internally threaded translation seat threadedly sleeved on the transverse electric-controlled lead screw, and a hammer body fixed outside the internally threaded translation seat.

[0009] The magnetically controlled regulating and limiting mechanism comprises an inner flip arm mounted on the side wall of the mounting column, an regulating support rod for controlling the inner flip arm, and a magnetically controlled telescopic head mounted on the end of the inner flip arm.

[0010] The axle weight applying fixture comprises a bottom support frame fixed on the upper surface of the bottom support frame, an electric control lifter fixed inside the bottom support frame, and a top fixture axially assembled on the top protruding end of the electric control lifter.

[0011] An embedded longitudinal guide rail is fixedly mounted on the outer side surface of the longitudinal side column.

[0012] The electrically controlled lifting soundproof cover comprises an electrically controlled lifting screw rod movably installed inside the embedded longitudinal guide rail, an internal thread lifting block threadedly sleeved on the electrically controlled lifting screw rod, and an external soundproof cover fixed outside the internal thread lifting block.

[0013] The upper surface of the bottom support frame is provided with a central assembly seat protruding upward at the rail assembly end, and an internal thread control device for controlling the translation of the rail is movably installed inside the central assembly seat.

[0014] A bottom guide groove matched with a central assembly seat is provided on the lower surface of the rail, and a transverse screw rod matched with an internal thread control device is fixedly mounted inside the bottom guide groove.

[0015] The beneficial effects of the present invention are: (1) The rail transit wheel acoustic performance test device of the present invention adopts a split design, including five parts: a bottom support platform, a pendulum excitation device, a suspension beam, an axle load application fixture, and a rail. All parts are connected by bolts, which is convenient for assembly and transportation and can be applied to various test environments; (2) By using an adjustable pendulum excitation device, different positions of the wheel can be struck, thereby greatly expanding the testable range and improving the comprehensiveness of the test data; (3) Replacing manual control with electronic control can greatly reduce the difficulty of operation and improve the accuracy of operation; (4) By sliding an electrically controlled lifting soundproof cover on the outside of the longitudinal side column, a soundproof cover can be formed on the periphery of the bottom support platform, without the need for external environment, and the scope of application is wider; (5) The present invention can carry out suspension no-axle load test as needed, and can also simulate axle load working condition test, and the simulation method is more diverse; (6) By using a steel rail with a translationally adjustable design, the wheels can be controlled to rotate, thereby simulating collisions during operation, and the simulation methods are more diverse; (7) The present invention can load and unload the moving wheels and simulate the load through the axle weight application fixture, which is convenient for replacement and adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0017] Figure 1 It is a structural schematic diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the present invention after the electrically controlled lifting sound insulation cover is removed.

[0019] Figure 3 It is a structural schematic diagram of the electric-controlled pendulum in the present invention.

[0020] Figure 4 It is a schematic diagram of the structure of the axle weight applying fixture of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure inside the rail in the present invention. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 A rail transit wheel acoustic performance test device shown includes a bottom support platform and a pendulum excitation device, wherein the bottom support platform includes a bottom support frame 1, longitudinal side columns 2 welded and fixed to both sides of the upper end of the bottom support frame 1, and a bottom universal wheel 3; The pendulum-type excitation device comprises a mounting column 4 and an electrically controlled pendulum 5 which are bolted to the upper surface of the bottom support frame 1; In order to cooperate with the bottom translation and top suspension, the upper surface of the bottom support frame 1 is equipped with a rail 6, the upper end of the longitudinal side column 2 is installed with a suspension beam 7, and the upper surface of the bottom support frame 1 is provided with an axle weight application fixture 8 on both sides of the rail 6; When the suspension beam 7 is in use, that is, under the condition of no axle load, it is suspended through the wheel axle hole through a flexible hanger, and the pendulum-type excitation device is installed in a fixed position, then hits the wheel, and the external sensor collects the acoustic signal; when the axle load applying fixture 8 is in use, that is, under the condition of axle load, after the target axle load is converted into bolt torque, the axle load applying fixture 8 is connected and tightened according to the calculated torque, and the pendulum-type excitation device is installed in a fixed position, then hits the wheel, and the external sensor collects the acoustic signal.

[0025] In order to form a closed soundproof area on the periphery, an electrically controlled lifting soundproof cover 9 is slidably mounted on the upper end of the bottom support frame 1 outside the longitudinal side column 2 .

[0026] When the wheel needs to be adjusted, the electrically controlled lifting sound insulation cover 9 is controlled to be lifted; and when the wheel adjustment is completed, the electrically controlled lifting sound insulation cover 9 is controlled to be lowered.

[0027] In order to improve the top installation stability, a top mounting seat 10 for improving the bottom support stability of the suspension beam 7 is welded and fixed to the upper end of the longitudinal side column 2, and the bottom universal wheel 3 is movably assembled at the lower corner position of the bottom support frame 1 through a roller bracket.

[0028] In order to cooperate with the electric-controlled knocking, the electric-controlled pendulum 5 includes a lateral swing arm 52 movably mounted on the upper end of the mounting column 4 through a top horizontal axis 51, a lateral electric-controlled pendulum 53 fixed on the lower end of the lateral swing arm 52, and a magnetically controlled adjustment limit mechanism 54 mounted on the side wall of the mounting column 4.

[0029] The lateral swing arm 52 is designed with an adjustable length and can be adjusted according to the specifications and sizes of different wheels.

[0030] In order to cooperate with the translation adjustment, the lateral electric-controlled pendulum 53 includes a lateral assembly frame 531 fixedly installed at the lower end of the lateral swing arm 52, a horizontal electric-controlled screw rod 532 movably installed inside the lateral assembly frame 531, an internally threaded translation seat 533 threadedly sleeved on the horizontal electric-controlled screw rod 532, and a hammer body 534 fixed on the outside of the internally threaded translation seat 533.

[0031] The horizontally placed electric control screw rod 532 controls the internal thread translation seat 533 to translate inside the lateral assembly frame 531 by rotating, thereby changing the position of the hammer body 534 striking the wheel as required; The hammer body 534 is fixed to the outer side of the internal thread translation seat 533 by bolts, which is convenient for replacement and reduces the cost of later use.

[0032] In order to cooperate with the adjustment, limitation and separation of the lateral swing arm 52, the magnetically controlled adjustment and limiting mechanism 54 includes an inner flip arm 541 installed on the side wall of the mounting column 4, an adjustment support rod 542 for controlling the inner flip arm 541 and a magnetically controlled telescopic head 543 installed at the end of the inner flip arm 541.

[0033] The adjusting strut 542 controls the inner flip arm 541 to perform flipping adjustment by telescoping, and the magnetically controlled telescopic head 543 includes an assembly sleeve fixed to the flipping end of the inner flip arm 541, a telescopic block slidably assembled inside the assembly sleeve, an annular electromagnet fixed inside the assembly sleeve, and an iron spring connected between the telescopic block and the annular electromagnet.

[0034] In order to cooperate with lateral assembly, the axle weight applying fixture 8 includes a bottom support frame 81 fixed on the upper surface of the bottom support frame 1, an electric lifter 82 fixed inside the bottom support frame 81, and a top fixture 83 axially assembled on the top protruding end of the electric lifter 82.

[0035] The electric lift 82 controls the lifting and lowering adjustment of the top clamp 83 through the top protruding end, and the wheel is placed on the upper surface of the bottom support frame 81 through the two side shafts. Then the electric lift 82 squeezes and limits the assembly shafts on both sides of the wheel through the arc-shaped assembly groove at the lower end of the top clamp 83, and the downward force of the electric lift 82 is used to simulate the wheel state under different load conditions.

[0036] In order to cooperate with the lateral lifting adjustment, an embedded longitudinal guide rail 11 is fixedly mounted on the outer side surface of the longitudinal side column 2.

[0037] In order to cooperate with the lifting and lowering adjustment, the electrically controlled lifting sound insulation cover 9 includes an electrically controlled lifting screw 91 movably installed inside the embedded longitudinal guide rail 11, an internally threaded lifting block 92 threadedly sleeved on the electrically controlled lifting screw 91, and an external sound insulation cover 93 fixed on the outside of the internally threaded lifting block 92.

[0038] The electrically controlled lifting screw 91 controls the internal thread lifting block 92 to rise and fall along the embedded longitudinal guide rail 11 by rotating, thereby controlling the synchronous lifting and adjustment of the external sound insulation cover 93. Sound-absorbing materials are attached to the inside and outside of the external sound insulation cover 93 to ensure sound insulation during the internal test process and avoid external sound interference and internal sound transmission.

[0039] After being installed, the pendulum excitation device strikes the wheel, and then an acoustic signal is collected through an external sensor installed on the mounting column 4.

[0040] In order to cooperate with the bottom guidance and adjustment, the upper surface of the bottom support frame 1 is located at the assembly end of the rail 6 and has an upwardly protruding central assembly seat 12, and the central assembly seat 12 is movably equipped with an internal thread control device 14 for controlling the translation of the rail 6.

[0041] The internal thread control device 14 controls the rail 6 to move along the central assembly seat 12 through operation. When the rail 6 moves, the wheels are driven to rotate, thereby simulating the operation state of rail transit.

[0042] In order to cooperate with the translation adjustment, a bottom guide groove 13 cooperating with the central assembly seat 12 is opened on the lower surface of the rail 6, and a horizontal screw rod 15 cooperating with the internal thread control device 14 is fixedly assembled inside the bottom guide groove 13.

[0043] The internal thread control device 14 includes an internal thread adjustment cylinder threadedly sleeved on the outside of the transverse screw rod 15, a transverse motor fixed inside the central assembly seat 12 and a control gear installed on the output shaft of the transverse motor. The transverse motor is meshed with the annular tooth groove on the outside of the internal thread adjustment cylinder through the control gear.

[0044] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A rail transit wheel acoustic performance test device, comprising a bottom support platform and a pendulum excitation device, characterized in that: The bottom support platform comprises a bottom support frame (1), longitudinal side columns (2) welded and fixed to both sides of the upper end of the bottom support frame (1), and bottom universal wheels (3); The pendulum-type excitation device comprises a mounting column (4) and an electrically controlled pendulum (5) fixed by bolts to the upper surface of the bottom support frame (1); The upper surface of the bottom support frame (1) is equipped with a steel rail (6), the upper ends of the longitudinal side columns (2) are equipped with hanging cross beams (7), and the upper surface of the bottom support frame (1) is provided with axle weight applying clamps (8) on both sides of the steel rail (6); The upper end of the bottom support frame (1) is located outside the longitudinal side column (2) and is slidably mounted with an electrically controlled lifting soundproof cover (9).

2. The rail transit wheel acoustic performance testing device according to claim 1, characterized in that: A top mounting seat (10) for improving the bottom support stability of the suspension beam (7) is welded and fixed to the upper end of the longitudinal side column (2), and the bottom universal wheel (3) is movably assembled at the corner position of the lower end of the bottom support frame (1) through a roller bracket.

3. The rail transit wheel acoustic performance testing device according to claim 1, characterized in that: The electric-controlled pendulum (5) comprises a lateral swing arm (52) movably mounted on the upper end of the mounting column (4) via a top transverse axis (51), a lateral electric-controlled pendulum (53) fixed to the lower end of the lateral swing arm (52), and a magnetically controlled regulating limit mechanism (54) mounted on the side wall of the mounting column (4).

4. The rail transit wheel acoustic performance testing device according to claim 3 is characterized in that: The lateral electric-controlled pendulum (53) comprises a lateral assembly frame (531) fixedly mounted on the lower end of the lateral swing arm (52), a transverse electric-controlled lead screw (532) movably mounted inside the lateral assembly frame (531), an internally threaded translation seat (533) threadedly sleeved on the transverse electric-controlled lead screw (532), and a hammer body (534) fixed on the outside of the internally threaded translation seat (533).

5. The rail transit wheel acoustic performance testing device according to claim 3 is characterized in that: The magnetically controlled adjustable limiting mechanism (54) comprises an inner flip arm (541) mounted on the side wall of the mounting column (4), an adjustable support rod (542) for controlling the inner flip arm (541), and a magnetically controlled telescopic head (543) mounted on the end of the inner flip arm (541).

6. The rail transit wheel acoustic performance testing device according to claim 1, characterized in that: The axle load applying fixture (8) comprises a bottom support frame (81) fixed to the upper surface of the bottom support frame (1), an electric-controlled lifter (82) fixed inside the bottom support frame (81), and a top fixture (83) axially mounted on the top protruding end of the electric-controlled lifter (82).

7. The rail transit wheel acoustic performance testing device according to claim 1 is characterized in that: An embedded longitudinal guide rail (11) is fixedly mounted on the outer side surface of the longitudinal side column (2).

8. The rail transit wheel acoustic performance testing device according to claim 7, characterized in that: The electrically controlled lifting soundproof cover (9) comprises an electrically controlled lifting screw (91) movably mounted inside the embedded longitudinal guide rail (11), an internally threaded lifting block (92) threadedly sleeved on the electrically controlled lifting screw (91), and an external soundproof cover (93) fixed to the outside of the internally threaded lifting block (92).

9. The rail transit wheel acoustic performance testing device according to claim 1, characterized in that: The upper surface of the bottom support frame (1) is located at the assembly end of the steel rail (6) and has a central assembly seat (12) protruding upwards, and an internal thread control device (14) for controlling the translation of the steel rail (6) is movably mounted inside the central assembly seat (12).

10. The rail transit wheel acoustic performance testing device according to claim 9, characterized in that: The lower surface of the steel rail (6) is provided with a bottom guide groove (13) that matches the central assembly seat (12), and a transverse screw rod (15) that matches the internal thread control device (14) is fixedly mounted inside the bottom guide groove (13).

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