A micro vibrator integrating driving, transmission and impact

Abstract

A micro vibrator integrating active, transmission and impact, which relates to a micro vibrator. The present invention aims to solve the problems of tight overall fit and relatively complex structure of existing micro vibrators, strong integrity, inconvenient for later maintenance and large size. The present invention includes a transmission part, an impact part and a power system, the impact part is installed at the bottom of the transmission part, the upper part of the transmission part is connected to the power system, and the impact part transmits power to the impact part through the transmission part through the power system to realize periodic excitation; the impact part includes a striker and a tower spring, the striker is horizontally slidably installed on the transmission part, and the tower spring is installed inside the transmission part, the energy transmitted by the striker from the transmission part compresses the tower spring in the first half cycle, and then releases the energy in the second half cycle, pushing the striker to transmit the excitation to the object under test, thereby realizing periodic excitation of the object. The present invention measures the microstructure in the frequency domain.

Description

Technical Field

[0001] The invention relates to a vibrator, in particular to a micro vibrator integrating active, transmission and impact, which is used for measuring the frequency domain result field of a rod-shaped object. Background Art

[0002] The steam generator heat transfer tube bundle in a nuclear power plant will produce flow-induced vibration due to uneven cross-flow scouring. Its damage is usually collision, wear and fatigue, etc. These damages will affect the availability and service life of the equipment. In nuclear power systems, it is very necessary to study the wear characteristics of flow-induced vibration on fuel elements and steam generator heat transfer tubes. The structural stability of both is related to the safe operation of nuclear power systems. The two elements mentioned above have the characteristics of small lateral dimensions, and existing micro-vibrators cannot be installed inside them. If excitation is given from the outside of the heat transfer tube, it will affect the flow field around the heat transfer tube and affect the study of flow-induced vibration. Excitation from the outside of the rod body will affect the accuracy of the modal frequency measurement results. Therefore, there is an urgent need for an exciter that can be installed inside the rod structure to provide step excitation.

[0003] As a tool for achieving excitation, the vibrator acts on an object after satisfying the mechanical motion that people hope to achieve, and can be used to study the properties of the object's structure. Common micro-vibrators mainly use the principle of electromagnetic induction, that is, electromagnetic type as its basic structure. The frequency of the vibrator of this structure is high and easy to control, but the excitation volume is not large enough, the cost is high and it is easy to leak magnetic flux. In some cases where the excitation frequency is not high, the electromagnetic micro-vibrator loses its advantages. In addition, in order to be able to measure the dry and wet dual modes of the rod, a new vibrator structure needs to be redesigned.

[0004] Chinese invention patent application publication number CN102259088A proposes a miniature dynamic magnetic exciter, whose structure includes a linear motor assembly, a compressor assembly and a suspension assembly. The linear motor assembly includes a concentric yoke pair, an excitation coil and a permanent magnet ring. The permanent magnet ring is composed of a stack of annular axial magnetizers and radial magnetizers. The invention reduces the processing requirements for parts, making the entire device structure simpler; the profile of the leaf spring is improved, and the dynamic magnetic exciter has stronger stability and longer service life. However, the overall fit of the invention is tight and the structure is relatively complex, and the integrity is strong, which is not conducive to later maintenance. At the same time, although the miniature dynamic magnetic exciter achieves the purpose of smaller size, its integrity characteristics and its rich internal structure limit its overall size. Compared with other miniature exciters, it still fails to make a breakthrough in the volume of the exciter.

[0005] In summary, the existing micro-vibrators have tight overall fit and relatively complex structure, strong integrity, which is not conducive to later maintenance and has large size. Summary of the invention

[0006] The purpose of the present invention is to solve the problems of tight overall fit and relatively complex structure of existing micro-vibrators, strong integrity, inconvenient for later maintenance and large size, and to provide a micro-vibrator integrating active, transmission and impact.

[0007] The technical solution of the present invention is: a micro-vibrator integrating active-transmission-impact trinity includes a transmission part, an impact part and a power system, the impact part is installed at the bottom of the transmission part, the upper part of the transmission part is connected to the power system, and the impact part transmits power to the impact part through the transmission part through the power system to realize periodic excitation; the impact part includes a striker and a tower-shaped spring, the striker is horizontally slidably installed on the transmission part, and the tower-shaped spring is installed inside the transmission part. The energy transmitted from the striker to the transmission part compresses the tower-shaped spring in the first half of the cycle, and then releases the energy in the second half of the cycle, pushing the striker to transmit the excitation to the object under test, thereby realizing periodic excitation of the object.

[0008] Furthermore, the firing pin includes a needle body, a hemispherical top and a curved hook. The needle body is a disc body, and a plurality of firing pin disc convex grooves are processed on the outer circumference of the needle body along its axial direction. A hemispherical top is processed in the middle part of the outer side of the needle body, and a curved hook is installed in the middle part of the inner side of the needle body.

[0009] Furthermore, the transmission part includes a first fixed pulley, a frame, a second fixed pulley and a traction rope. The frame includes a vertical frame and a horizontal frame. Both the vertical frame and the horizontal frame are hollow frames. The horizontal frame is horizontally installed at the bottom end of the vertical frame and is connected. The first fixed pulley is rotatably installed on the inner wall of the top end of the vertical frame of the frame. The second fixed pulley is rotatably installed in the horizontal frame of the frame. One end of the traction rope is connected to the power system, and the other end of the traction rope passes around the first fixed pulley and the second fixed pulley in turn and then passes through the tower spring to be connected to the striker.

[0010] Furthermore, a plurality of grooves are formed at equal intervals on the open side of the horizontal frame in the circumferential direction, and the concave shape of the grooves is an arc shape.

[0011] Furthermore, the first fixed pulley includes a connecting shaft, a first bearing, two connecting frames and a first wheel body. The first wheel body is rotatably mounted on the connecting shaft through the first bearing. Both ends of the connecting shaft are respectively mounted on the vertical frame through a connecting frame.

[0012] Furthermore, the second fixed pulley includes a connecting frame, a second bearing and a second wheel body. The second wheel body is connected to the connecting frame after being rotatably mounted via the second bearing, and the connecting frame is mounted in the horizontal frame.

[0013] Furthermore, the number of the grooves is 3, 4 or 5.

[0014] Furthermore, the length of the groove is the compression length of the conical spring.

[0015] Furthermore, the power system includes a fixed plate, a crank rocker structure, a gearbox and a motor. A rope groove is opened on the fixed plate, the crank rocker structure is installed on the fixed plate, the output side of the gearbox is connected to the active part of the crank rocker structure, the driven part of the crank rocker structure is connected to the traction rope, and the output shaft of the motor is connected to the gearbox.

[0016] Furthermore, the crank rocker structure includes a driven member, a connecting rod and a driving member, and the driven member and the driving member are connected by a connecting rod.

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

[0018] 1. The present invention can be installed inside a rod-shaped structure to give the rod structure a step excitation. It can work in a space with a minimum size of not less than 15 mm and is arranged inside the rod structure to minimize the impact on the rod modal. The present invention is mainly aimed at measuring the vibration frequency domain of the heat transfer tube of the steam generator in the nuclear power system, and it is also applicable to other experimental fields that need to measure the frequency domain results of the vibration of the rod.

[0019] 2. The present invention is a three-in-one micro-vibrator device that integrates activeness, transmission and impact. The traditional integrated vibrator is disassembled into three parts, and each part is responsible for completing each step of the action, thereby achieving the purpose of excitation. The active part is the power device, which drives the traction rope through the crank rocker structure to achieve periodic excitation, and the excitation frequency can be controlled through the gearbox. The transmission part is composed of two fixed pulleys and a traction rope, which transmits power to the impact part. The impact part is composed of a striker and a tower-shaped spring. The excitation action first compresses the spring in the first half of the cycle with the energy transmitted by the transmission part, and then releases the energy in the second half of the cycle, pushing the striker to transmit the excitation to the object under test, thereby achieving excitation of the object.

[0020] 3. The present invention constructs a frame of the vibrator composed of two mutually perpendicular cylinders, which can not only assemble various parts of the vibrator, but also play a role in fixing the vibrator when the vibrator works deep inside the rod body.

[0021] 4. The "active-transmission-impact trinity" structure adopted by the micro vibrator proposed in the present invention greatly reduces the volume of the vibrator; the device in the tube can be free of electrical appliances, meeting the requirements of more complex environments; the relatively simple structure of the invention makes its cost lower than other micro vibrators. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention. Figure 2 yes Figure 1 A local enlarged view at point A; Figure 3 yes Figure 1 A local enlarged view at point B; Figure 4It is a structural diagram of the rack part; Figure 5 is a schematic diagram of the groove 10 on the horizontal frame 9;

[0023] Figure 6 It is a top view of the rack part; Figure 7 is a schematic diagram of the structure of the second fixed pulley; Figure 8 is a schematic diagram of the structure of the first fixed pulley; Fig. 9 is a schematic diagram of the position where the bearing is installed on the first fixed pulley; Fig.10 It is a schematic diagram of the structure of the firing pin; Fig.11 It is a schematic diagram of the connection between the traction rope and the power unit and a schematic diagram of the structure of the power unit. Fig.12 It is a work flow chart of the present invention. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figures 1 to 12 The present embodiment is described. A micro vibrator integrating active-transmission-impact trinity comprises a transmission part, an impact part and a power system 7. The impact part is installed at the bottom of the transmission part, and the upper part of the transmission part is connected to the power system 7. The impact part transmits power to the impact part through the transmission part through the power system 7 to realize periodic excitation; the impact part comprises a striker 3 and a tower-shaped spring 4. The striker 3 is horizontally slidably installed on the transmission part, and the tower-shaped spring 4 is installed inside the transmission part. The energy transmitted from the striker 3 to the transmission part compresses the tower-shaped spring 4 in the first half cycle, and then releases the energy in the second half cycle, pushing the striker 3 to transmit the excitation to the object under test, thereby realizing periodic excitation of the object.

[0025] The volume of this embodiment is small enough and can give a step excitation to the rod body, so as to measure the dry and wet modes of the rod body.

[0026] Specific implementation method 2: Combination Fig.10 This embodiment is described. The striker 3 of this embodiment includes a needle body, a hemispherical top 22 and a hook 20. The needle body is a disc body. A plurality of striker disc convex grooves 21 are processed on the outer circumference of the needle body along its axial direction. A hemispherical top 22 is processed in the middle of the outer side of the needle body, and a hook 20 is installed in the middle of the inner side of the needle body. With such a configuration, the hook 20 facilitates the power connection of the traction rope. Other components and connection relationships are the same as those of the first embodiment.

[0027] Specific implementation method three: Combination Figures 1 to 4To illustrate this embodiment, the transmission part of this embodiment includes a first fixed pulley 1, a frame 2, a second fixed pulley 5 and a traction rope 6. The frame 2 includes a vertical frame 8 and a horizontal frame 9. The vertical frame 8 and the horizontal frame 9 are both hollow frames. The horizontal frame 9 is horizontally installed at the bottom end of the vertical frame 8 and is connected. The first fixed pulley 1 is rotatably installed on the inner wall of the top end of the vertical frame 8 of the frame 2. The second fixed pulley 5 is rotatably installed in the horizontal frame 9 of the frame 2. One end of the traction rope 6 is connected to the power system 7, and the other end of the traction rope 6 passes around the first fixed pulley 1 and the second fixed pulley 5 in turn and then passes through the tower spring 4 to be connected to the striker 3.

[0028] This arrangement facilitates the transmission of power to the striker, which intermittently strikes the groove to achieve vibration. Other components and connection relationships are the same as those of the first or second specific implementation.

[0029] This embodiment further includes two fixed ribs 12. A fixed rib 12 is installed on both sides of the connection between the vertical frame 8 and the horizontal frame 9, respectively, so as to ensure the firmness and stability of the entire frame during the vibration excitation process.

[0030] Specific implementation method four: Combination Figure 5 To explain this embodiment, the open side of the horizontal frame 9 of this embodiment is provided with a plurality of grooves 10 at equal intervals in the circumferential direction, and the concave shape of the grooves 10 is an arc shape. This arrangement is convenient for ensuring that the motion trajectory of the striker excitation is unique. The other components and connection relationships are the same as those of the specific embodiments one, two or three.

[0031] Specific implementation method five: Combination Figure 8 and Fig. 9 This embodiment is described. The first fixed pulley 1 of this embodiment includes a connecting shaft 16, a first bearing 19, two connecting frames 17 and a first wheel body 18. The first wheel body 18 is rotatably mounted on the connecting shaft 16 through the first bearing 19. Both ends of the connecting shaft 16 are respectively mounted on the vertical frame 8 through a connecting frame 17. Such a configuration makes the structure compact and stable. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3 or 4.

[0032] Specific implementation method six: Combination Figure 1 and Figure 2 To explain this embodiment, the second fixed pulley 5 of this embodiment includes a connecting frame 13, a second bearing 14 and a second wheel body 15. The second wheel body 15 is connected to the connecting frame 13 after being rotatably mounted by the second bearing 14, and the connecting frame 13 is installed in the horizontal frame 9. Such a configuration has a simple and stable structure. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4 or 5.

[0033] Specific implementation method seven: Combination Figure 5To illustrate this embodiment, the number of the grooves 10 in this embodiment is 3, 4 or 5. This arrangement facilitates the guidance of the movement position of the striker. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5 or 6.

[0034] Specific implementation method eight: Combination Figure 4 To explain this embodiment, the length of the groove 10 of this embodiment is the compressed length of the conical spring 4. This arrangement is convenient for ensuring the movement limit position of the striker and the reliability of the excitation. The other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4, 5, 6 or 7.

[0035] Specific implementation method nine: Combination Fig.11 This embodiment is described. The power system 7 of this embodiment includes a fixed plate 27, a crank rocker structure 26, a gearbox 28 and a motor 29. The fixed plate 27 is provided with a rope groove 23. The crank rocker structure 26 is mounted on the fixed plate 27. The output side of the gearbox 28 is connected to the active member 25 of the crank rocker structure 26. The driven member of the crank rocker structure 26 is connected to the traction rope 6. The output shaft of the motor 29 is connected to the gearbox 28. This arrangement facilitates the output of power. Other components and connection relationships are the same as any one of the specific embodiments 1 to 8.

[0036] Specific implementation method ten: Combination Fig.11 To explain this embodiment, the crank rocker structure 26 of this embodiment includes a driven member 24, a connecting rod and a driving member 25, and the driven member 24 and the driving member 25 are connected by a connecting rod. Such a configuration has a simple structure and reliable operation. Other components and connection relationships are the same as any one of the specific embodiments 1 to 9.

[0037] Combination Figure 1 -to Fig.12 The working principle of the present invention is described:

[0038] The present invention is based on a frame 2, and the first fixed pulley 1 and the second fixed pulley 5 are installed from top to bottom in sequence; the spring 4, the striker 3, and the traction rope 6 are installed from left to right in sequence, passing through the first fixed pulley 1, passing through the connecting circle 11, and then passing through the second fixed pulley 5 to connect to the hook 20 on the striker 3, and the other end is connected to the power system 7. The large diameter end of the spring 4 is horizontally connected to the horizontal frame 9, and the small diameter end is connected to the striker disc 21. The horizontal frame 9 and the spring 4 are coaxially connected.

[0039] The frame 2 is divided into a vertical frame 8 and a horizontal frame 9. The upper portion of the horizontal frame 8 is opened with a connecting circle 11, and the front portion is opened with four grooves 10. The second fixed pulley 5 is divided into a bearing 14, a wheel body 15, and a connecting frame 13, and is horizontally connected to the horizontal frame 9 through the connecting frame 13.

[0040] The first fixed pulley 1 is divided into a connection 16, a bearing 19, a connecting frame 17, and a wheel body 18. The first fixed pulley 1 is connected to the vertical frame 8 at an angle of 45° through the connecting frame 17. The striker disc convex groove 21 matches the housing groove 10.

[0041] The connection between the power system 7 of the exciter and the traction rope 6 is shown in the figure. The traction rope 6 passes around the first fixed pulley 1, and then is connected to the driven part 24 of the crank rocker structure 26 through the fixed rope groove 23. The crank rocker structure 26 is fixed on the fixed plate 27, and its active part 25 is connected to the gearbox 28, and the gearbox 28 is connected to the motor 29.

[0042] When the micro-vibrator starts working, the energy generated by the motor is loaded onto the crank rocker structure after passing through the gearbox. The structure changes the mechanical motion form and is loaded onto the traction rope. In one cycle, i.e. one rotation of the crank rocker structure driving wheel, the traction rope after two fixed pulley changes direction pulls the striker on the fixed track toward the spring, compressing the spring. After that, the spring is released to drive the striker toward the object to be measured, and hits the object to be measured to complete one vibration. Due to the quick return characteristics of the crank rocker structure, the release of the spring will not be affected by the traction rope.

[0043] Although the present invention has been disclosed as above in terms of preferred embodiments, this is not intended to limit the present invention. Those skilled in the art may also make other changes within the spirit of the present invention, and apply the present invention to fields not mentioned herein. Of course, these changes made in accordance with the spirit of the present invention should be included in the scope of protection claimed by the present invention.

Claims

1. A micro vibrator integrating driving, transmission and impact, characterized in that: It comprises a transmission part, an impact part and a power system (7), wherein the impact part is installed at the bottom of the transmission part, the top of the transmission part is connected to the power system (7), and the impact part transmits power to the impact part through the power system (7) via the transmission part to realize periodic excitation; The impact part comprises a striker (3) and a tower-shaped spring (4), wherein the striker (3) is horizontally slidably mounted on the transmission part, and the tower-shaped spring (4) is mounted inside the transmission part. The energy transmitted by the striker (3) from the transmission part compresses the tower-shaped spring (4) in the first half cycle, and then releases the energy in the second half cycle, pushing the striker (3) to transmit the excitation to the object to be measured, thereby realizing periodic excitation of the object. The micro-vibrator integrating active-transmission-impact is mounted inside the rod-shaped structure, giving step excitation to the rod structure, and working in a space with a minimum size of not less than 15 mm, thereby minimizing the influence on the rod mode to the greatest extent. The striker (3) comprises a needle body, a hemispherical top (22) and a curved hook (20); the needle body is a disc body, a plurality of striker disc convex grooves (21) are processed on the outer circumference of the needle body along its axial direction, a hemispherical top (22) is processed in the middle of the outer side of the needle body, and a curved hook (20) is installed in the middle of the inner side of the needle body; The transmission part comprises a first fixed pulley (1), a frame (2), a second fixed pulley (5) and a traction rope (6); the frame (2) comprises a vertical frame (8) and a horizontal frame (9); both the vertical frame (8) and the horizontal frame (9) are hollow frames; the horizontal frame (9) is horizontally mounted at the bottom end of the vertical frame (8) and is connected to the vertical frame (8); the first fixed pulley (1) is rotatably mounted on the inner side wall of the top end of the vertical frame (8) of the frame (2); the second fixed pulley (5) is rotatably mounted in the horizontal frame (9) of the frame (2); one end of the traction rope (6) is connected to the power system (7); the other end of the traction rope (6) passes through the first fixed pulley (1) and the second fixed pulley (5) in sequence, and then passes through the tower spring (4) and is connected to the striker (3).

2. The micro-vibrator integrating driving, transmission and impact according to claim 1, characterized in that: A plurality of grooves (10) are provided at equal intervals on the open side of the horizontal frame (9) in the circumferential direction, and the inner concave shape of the grooves (10) is an arc shape.

3. The micro-vibrator integrating driving, transmission and impact according to claim 2 is characterized in that: The first fixed pulley (1) comprises a connecting shaft (16), a first bearing (19), two connecting frames (17) and a first wheel body (18). The first wheel body (18) is rotatably mounted on the connecting shaft (16) via the first bearing (19). Both ends of the connecting shaft (16) are respectively mounted on a vertical frame (8) via a connecting frame (17).

4. The micro-vibrator integrating driving, transmission and impact as claimed in claim 3 is characterized in that: The second fixed pulley (5) comprises a connecting frame (13), a second bearing (14) and a second wheel body (15). The second wheel body (15) is connected to the connecting frame (13) after being rotatably mounted via the second bearing (14). The connecting frame (13) is mounted in the horizontal frame (9).

5. The micro-vibrator integrating driving, transmission and impact according to claim 4, characterized in that: The number of the grooves (10) is 3, 4 or 5.

6. The micro-vibrator integrating driving, transmission and impact according to claim 5, characterized in that: The length of the groove (10) is the compression length of the conical spring (4).

7. The micro-vibrator integrating driving, transmission and impact according to claim 6, characterized in that: The power system (7) comprises a fixed plate (27), a crank rocker structure (26), a gearbox (28) and a motor (29); a rope groove (23) is provided on the fixed plate (27); the crank rocker structure (26) is mounted on the fixed plate (27); the output side of the gearbox (28) is connected to the active part (25) of the crank rocker structure (26); the driven part of the crank rocker structure (26) is connected to the traction rope (6); and the output shaft of the motor (29) is connected to the gearbox (28).

8. The micro-vibrator integrating driving, transmission and impact according to claim 7, characterized in that: The crank rocker structure (26) comprises a driven member (24), a connecting rod and a driving member (25), and the driven member (24) and the driving member (25) are connected via the connecting rod.

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