Electromagnetic vibration exciter for applying self-source vibration and vibration testing device

Abstract

The invention relates to the technical field of communication and transportation, and discloses an electromagnetic vibration exciter for applying self-source vibration and a vibration testing device.The electromagnetic vibration exciter comprises a base which is installed on a tested object, the top end of the base is detachably connected with a shell, and the top end of the shell and the bottom end of the base are provided with an upper electromagnet and a lower electromagnet respectively; the buffering assembly comprises two electromagnets and two buffering pieces, the two electromagnets are arranged at the top end in the shell and the top end of the base respectively, a permanent magnet is connected between the two electromagnets through the two buffering pieces, and the two electromagnets are connected with an external power amplifier and a controller; and the electromagnet is configured to control the vibration frequency and amplitude of the vibration exciter by controlling the current in the two electromagnets. The device is small in overall structure, easy to install on a tested object, enables the tested object to spontaneously generate vibration, more accurately simulates the self-vibration characteristics of the tested object, is reasonable in design and simple in structure, and can effectively simulate the self-source vibration of the tested object.

Description

Technical Field

[0001] The present invention relates to the technical field of transportation, and in particular to an electromagnetic exciter and a vibration testing device for applying self-generated vibration. Background Art

[0002] With the development of modern technology, vibration testing equipment is widely used in the testing of vehicles, buildings and various mechanical equipment. At present, most exciters are generally not installed on the object under test, but the object under test is installed on the vibration table of the exciter. Vibration testing usually relies on an external excitation source to simulate vibration. Therefore, for the object under test, the vibration is an external excitation. However, this method has certain limitations, such as the inability to accurately simulate the vibration characteristics of the object under test under actual working conditions, such as the vibration caused by passengers on transportation vehicles to the vehicle body, which may lead to deviations in the test results, and most exciters are driven by eccentric motors, which cannot effectively control the vibration size, frequency and amplitude.

[0003] Therefore, there is an urgent need for an electromagnetic exciter and a vibration testing device for applying self-generated vibration to solve the above problems. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic exciter and a vibration testing device for applying self-generated vibration, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides an electromagnetic exciter for applying self-generated vibration, comprising:

[0006] A base is installed on the object to be measured, the top of the base is detachably connected to a shell, and the top of the shell and the bottom of the base are respectively provided with an upper electromagnet and a lower electromagnet;

[0007] The buffer assembly includes two electromagnets and two buffer parts. The two electromagnets are respectively arranged at the top of the shell and the top of the base. A permanent magnet is connected between the two electromagnets through the two buffer parts. The two electromagnets are connected to an external power amplifier and a controller, and are configured to control the vibration frequency and amplitude of the exciter by controlling the current in the two electromagnets.

[0008] According to an electromagnetic exciter for applying self-generated vibration provided by the present invention, the buffer member comprises:

[0009] A flat-end set screw is installed in the middle of one end of the electromagnet close to the permanent magnet;

[0010] A spring has one end sleeved on the flat-end set screw, and the other end of the spring is connected to the permanent magnet.

[0011] An electromagnetic exciter for applying self-generated vibration provided by the present invention also includes a permanent magnet protection shell, the permanent magnet is fixedly connected in the permanent magnet protection shell, and the permanent magnet protection shell is fixedly connected to the spring.

[0012] According to an electromagnetic exciter for applying self-generated vibration provided by the present invention, a plurality of heat dissipation holes are provided on the side wall of the shell.

[0013] According to an electromagnetic exciter for applying self-generated vibration provided by the present invention, a plurality of coil wiring holes are opened on the side wall of the shell, and the wiring of the upper electromagnet and the lower electromagnet both pass through the coil wiring holes.

[0014] According to an electromagnetic exciter for applying self-generated vibration provided by the present invention, the shell is connected to the base through a plurality of connecting bolts.

[0015] According to an electromagnetic exciter for applying self-generated vibration provided by the present invention, a plurality of mounting holes are provided at the bottom end of the base, and the mounting holes are used for mounting force sensors.

[0016] A vibration testing device comprises an electromagnetic exciter for applying self-generated vibration, wherein the electromagnetic exciter is mounted on a testing device body.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects:

[0018] The present invention provides an electromagnetic exciter and a vibration testing device for applying self-generated vibration. The base is installed on the object to be tested, the upper electromagnet is installed on the top of the shell, and the lower electromagnet is installed on the bottom of the base. The buffer member is arranged to adjust the stroke length of the permanent magnet running up and down and to buffer the permanent magnet when it moves up and down. By controlling the power supply direction of the electromagnet coil and controlling the two sets of coils at the same time, the power supply directions are the same at the same time, that is, the magnetic field directions are the same, so the permanent magnet will be attracted / repelled to move in the same direction. By controlling the frequency of the change of the coil current, the The movement frequency of the permanent magnet, that is, the vibration frequency of the exciter, can be controlled by controlling the absolute value of the coil current to control the impact force of the permanent magnet, that is, the amplitude of the exciter. The overall structure is compact and easy to install on the object under test, allowing the object under test to vibrate spontaneously. It can be widely used in various vibration test scenarios and has strong adaptability and flexibility. At the same time, the electromagnetic exciter can achieve efficient vibration control of the permanent magnet by changing the direction of the current, thereby more accurately simulating the self-vibration characteristics of the object under test. It has a reasonable design and a simple structure, and can effectively simulate the self-sourced vibration of the object under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0020] Figure 1 It is a schematic diagram of the overall structure of the electromagnetic exciter of the present invention;

[0021] Figure 2 It is a cross-sectional view of the electromagnetic exciter of the present invention;

[0022] Figure 3 This is a structural diagram of Embodiment 2 of the present invention;

[0023] Among them, 1. shell; 2. connecting bolts; 3. base; 4. electromagnet; 5. flat-end set screw; 6. spring; 7. permanent magnet protective shell; 8. permanent magnet; 9. rubber gasket; 10. guide sleeve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1:

[0027] Reference Figure 1-Figure 2 The present invention provides an electromagnetic exciter for applying self-generated vibration, comprising:

[0028] The base 3 is installed on the object to be measured, the top of the base 3 is detachably connected to the housing 1, and the top of the housing 1 and the bottom of the base 3 are respectively provided with an upper electromagnet and a lower electromagnet;

[0029] The buffer assembly includes two electromagnets 4 and two buffer parts. The two electromagnets 4 are respectively arranged at the top of the shell 1 and the top of the base 3. A permanent magnet 8 is connected between the two electromagnets 4 through the two buffer parts. The two electromagnets 4 are connected to an external power amplifier and a controller, and are configured to control the vibration frequency and amplitude of the exciter by controlling the current in the two electromagnets 4.

[0030] In one embodiment of the present invention, the base 3 is installed on the object to be measured, the top of the shell 1 is provided with an upper electromagnet mounting hole, the upper electromagnet is connected to the shell 1 by bolts, the bottom of the base 3 is also provided with a lower electromagnet mounting hole, the lower electromagnet is connected to the base 3 by bolts, and the stroke length of the permanent magnet 8 running up and down can be adjusted by the provided buffer, and the permanent magnet 8 can be buffered when it moves up and down, and the power-on direction of the electromagnet 4 coil is controlled, and the two sets of coils are controlled at the same time, so that the power-on directions are the same at the same time, that is, the magnetic field directions are the same, so the permanent magnet 8 will be attracted / repelled to move in the same direction, and the control line The changing frequency of the coil current can control the movement frequency of the permanent magnet 8, that is, the vibration frequency of the exciter. By controlling the absolute value of the coil current, the impact force of the permanent magnet 8, that is, the amplitude of the exciter, can be controlled. The overall structure is compact and easy to install on the object under test, allowing the object under test to vibrate spontaneously. It can be widely used in various vibration test scenarios and has strong adaptability and flexibility. At the same time, the electromagnetic exciter can achieve efficient vibration control of the permanent magnet 8 by changing the direction of the current, thereby more accurately simulating the self-vibration characteristics of the object under test. It has a reasonable design and a simple structure, and can effectively simulate the self-sourced vibration of the object under test.

[0031] As an optional embodiment, the buffer member includes:

[0032] A flat-end set screw 5 is installed in the middle of one end of the electromagnet 4 close to the permanent magnet 8;

[0033] One end of the spring 6 is sleeved on the flat-end set screw 5 , and the other end of the spring 6 is connected to the permanent magnet 8 .

[0034] In one embodiment of the present invention, referring to Figure 2 One end of the spring 6 is sleeved on the flat-end tightening screw 5 to guide the spring 6. By selecting the flat-end tightening screw 5 and adjusting the length of the flat-end tightening screw 5 screwed into the iron core of the electromagnet 4, the stroke length of the permanent magnet 8 running up and down can be adjusted. The flat-end tightening screw 5 and the spring 6 constitute a buffer when the permanent magnet 8 moves up and down.

[0035] Specifically, the spring 6 is designed to be slightly compressed when the permanent magnet 8 reaches the upper highest point, so as to ensure that the spring 6 does not fall off.

[0036] As an optional implementation, it further includes a permanent magnet protection shell 7 , the permanent magnet 8 is fixedly connected inside the permanent magnet protection shell 7 , and the permanent magnet protection shell 7 is fixedly connected to the spring 6 .

[0037] In one embodiment of the present invention, the permanent magnet protection shell 7 is used to fix and protect the permanent magnet 8, and the flat-end set screw 5, the spring 6, and the permanent magnet protection shell 7 together constitute a buffer when the permanent magnet 8 moves up and down.

[0038] As an optional implementation, a plurality of heat dissipation holes are provided on the side wall of the housing 1 .

[0039] In one embodiment of the present invention, a plurality of heat dissipation holes are provided for heat dissipation.

[0040] As an optional implementation, a plurality of coil wiring holes are opened on the side wall of the housing 1, and the wiring of the upper electromagnet and the lower electromagnet both pass through the coil wiring holes.

[0041] In one embodiment of the present invention, a plurality of coil wiring holes are provided for passing connecting wires on the electromagnet.

[0042] As an optional implementation, the housing 1 is connected to the base 3 via a plurality of connecting bolts 2 .

[0043] In one embodiment of the present invention, the housing 1 is connected to the base 3 by a plurality of connecting bolts 2 to ensure convenient installation and disassembly.

[0044] As an optional implementation, a plurality of mounting holes are provided at the bottom end of the base 3 , and the mounting holes are used to install the force sensors.

[0045] In one embodiment of the present invention, four holes for installing force sensors are opened at the bottom of the base 3, which are installed before installing the lower electromagnet. The holes can also be adjusted and adapted to be installed on the object to be measured.

[0046] Specifically, in the case where a force sensor is not required, other forms of installation may be adopted. In the case where a smaller volume is required, the upper electromagnet 4 may be removed, but the buffer member may be retained.

[0047] A vibration testing device comprises an electromagnetic exciter for applying self-generated vibration, wherein the electromagnetic exciter is mounted on a testing device body.

[0048] Embodiment 2:

[0049] Reference Figure 3 In the scenario where the movement distance of the permanent magnet 8 does not exceed its diameter, the buffer can be replaced with a guide sleeve 10 and a rubber gasket 9, that is, the spring 6 and the flat-end set screw 5 are replaced with a rubber gasket 9 attached to the end face of the electromagnet 4, and a guide sleeve 10 slightly larger than the diameter of the permanent magnet 8 is added for guidance.

[0050] By setting it in this way, the spring 6 and the permanent magnet 8 can be prevented from being bonded and fixed, reducing the probability of equipment failure. At the same time, the rubber can provide a more uniform buffer, but the movement distance of the permanent magnet 8 will be relatively limited and cannot exceed the diameter of the permanent magnet 8, otherwise the guide sleeve 10 in this embodiment cannot be used to limit it.

[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. An electromagnetic exciter for applying self-generated vibration, characterized in that: include: A base (3) is mounted on the object to be measured, the top of the base (3) is detachably connected to the housing (1), and the top of the housing (1) and the bottom of the base (3) are respectively provided with an upper electromagnet and a lower electromagnet; The buffer assembly comprises two electromagnets (4) and two buffer parts. The two electromagnets (4) are respectively arranged at the top of the inside of the shell (1) and the top of the base (3). A permanent magnet (8) is connected between the two electromagnets (4) via the two buffer parts. The two electromagnets (4) are connected to an external power amplifier and a controller, and are configured to control the vibration frequency and amplitude of the exciter by controlling the current in the two electromagnets (4).

2. The electromagnetic exciter for applying self-generated vibration according to claim 1, characterized in that: The buffer member comprises: A flat-end set screw (5) is installed in the middle of one end of the electromagnet (4) close to the permanent magnet (8); One end of the spring (6) is sleeved on the flat-end set screw (5), and the other end of the spring (6) is connected to the permanent magnet (8).

3. An electromagnetic exciter for applying self-generated vibration according to claim 2, characterized in that: It also comprises a permanent magnet protection shell (7), the permanent magnet (8) is fixedly connected inside the permanent magnet protection shell (7), and the permanent magnet protection shell (7) is fixedly connected to the spring (6).

4. The electromagnetic exciter for applying self-generated vibration according to claim 1, characterized in that: A plurality of heat dissipation holes are provided on the side wall of the shell (1).

5. The electromagnetic exciter for applying self-generated vibration according to claim 1, characterized in that: A plurality of coil wiring holes are provided on the side wall of the shell (1), and the wiring of the upper electromagnet and the lower electromagnet both pass through the coil wiring holes.

6. The electromagnetic exciter for applying self-generated vibration according to claim 1, characterized in that: The shell (1) is connected to the base (3) via a plurality of connecting bolts (2).

7. The electromagnetic exciter for applying self-generated vibration according to claim 1, characterized in that: A plurality of mounting holes are provided at the bottom end of the base (3), and the mounting holes are used for mounting force sensors.

8. A vibration testing device, comprising an electromagnetic exciter for applying self-generated vibration as claimed in claim 1, characterized in that: The electromagnetic exciter is installed on the test device body.

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