Modularized high-stability vibration exciter mounting bracket

Abstract

The invention belongs to the technical field of aviation structure tests, and particularly relates to a modularized high-stability vibration exciter mounting bracket. Comprising a lifting support and an expansion support, and the lifting support is arranged at the upper end of the expansion support; the expansion bracket is fixed on the working table, and a folding supporting rod assembly is arranged on the side surface of the expansion bracket and is used for auxiliary supporting of the expansion bracket; a vibration exciter mounting plate is fixed to the upper end of the lifting support and used for mounting and fixing a vibration exciter, and the height of the vibration exciter mounting plate is adjustable. The mounting bracket provided by the invention can adapt to different height ranges, the lifting brackets with different strokes and the expansion brackets with different heights are designed, and the test requirement of a larger height range is met through the combination of the lifting brackets and the expansion brackets. Meanwhile, through the modularized design, the height adaptability and the test flexibility of the support are enhanced.

Description

Technical Field

[0001] The invention belongs to the technical field of aviation structure testing, and in particular relates to a modular high-stability flexible vibration exciter mounting bracket. Background Art

[0002] In ground vibration tests of aircraft structures, an exciter is usually used to excite the aircraft structure to test the vibration mode of the aircraft structure. There are two ways to install the exciter: flexible installation and rigid installation. The rigid installation should minimize the vibration of the shell of the exciter during operation, so as to ensure the transmission effect of the exciting force and the safety of the test piece and the exciter. Vertical and lateral excitation are usually required in the test, which requires that the vertical and lateral stiffness of the mounting structure should be good enough when the exciter is rigidly supported, and the mounting structure should not be displaced under the excitation of the exciter reaction force. In addition, since the excitation point needs to be replaced, the installation height usually changes. Therefore, the mounting structure needs to have good height adaptability and be easy to move.

[0003] In the existing aviation structure test technology, some institutions do not pay attention to the performance of the exciter mounting bracket when conducting ground vibration tests. Although the bracket itself has sufficient rigidity, the unreasonable structural design leads to poor overall vertical and lateral stiffness of the bracket after the exciter is installed. During the test, the exciter sweeps the test piece, causing the mounting structure to move under the action of the broadband reaction force, and the excitation force loading effect deteriorates. Some practices place lead blocks on the bracket to increase the deadweight of the bracket, which not only increases the difficulty of the test work, but also cannot fully adapt to the changing test conditions and requirements. In addition, the unreasonable design makes the mounting bracket often inconvenient to move, especially when the excitation point needs to be changed during the test, which is time-consuming and laborious. Summary of the invention

[0004] The purpose of the present invention is to design a set of vibration exciter mounting brackets that can adapt to different height requirements (300-2200mm), have sufficient vertical and lateral stiffness, be easy to move, simple and labor-saving to lift and lower, and ensure stable operation of the vibration exciter in response to the requirements of aircraft structure ground vibration tests.

[0005] Technical solution of the present invention: In order to achieve the above-mentioned purpose, the present invention proposes a modular high-stability exciter mounting bracket, comprising: a lifting bracket and an extension bracket, the lifting bracket is arranged at the upper end of the extension bracket; the extension bracket is fixed on the workbench, and a folding support rod assembly is arranged on its side for auxiliary support of the extension bracket; an exciter mounting plate is fixed on the upper end of the lifting bracket for installing and fixing the exciter, and the height of the exciter mounting plate is adjustable.

[0006] Furthermore, the lifting bracket is provided with a height adjustment component to achieve height adjustment of the exciter mounting plate.

[0007] Furthermore, the lifting bracket includes: a screw rod, a driving nut, a movable ratchet, a lifting handle, a diagonal tie rod, an outer tube, and a support arm; a plurality of support arms form a base platform of the lifting bracket, and the outer tube is arranged at the center of the base platform; one end of the screw rod extends into the outer tube, and the other end is connected to the exciter mounting plate; a diagonal tie rod auxiliary support is also arranged between the base platform and the outer tube;

[0008] The screw is connected to the drive nut; the lifting handle is installed on the handle supporting clamp, and a movable ratchet is installed on the handle supporting clamp, the movable ratchet engages with the ratchet groove on the drive nut, and the force of the lifting handle is transmitted to the drive nut to rotate the drive nut, and the direction of the movable ratchet can realize the rotation of the drive nut in different directions, thereby realizing the lifting and lowering adjustment of the lifting bracket.

[0009] Furthermore, the driving nut cooperates with the outer cylinder through a tapered roller bearing to reduce the resistance when the bracket is lifted or lowered.

[0010] Furthermore, an anti-rotation groove is formed on the screw rod and cooperates with a stop block to prevent the screw rod from rotating.

[0011] Furthermore, after the lifting is completed, the locking screw is tightened to reduce the gap between the outer cylinder, the stop block and the screw rod, thereby locking the screw rod.

[0012] Furthermore, a wear-resistant support ring is installed at the end of the screw.

[0013] Furthermore, the extended bracket bears the vertical load through the column. When the excitation point is higher, the folding support rod assembly and the lower arm can be opened to increase the length of the lateral arm of the bracket, thereby improving the lateral stability of the bracket.

[0014] Furthermore, the upper support rod (23) of the folding support rod assembly is connected to the lower support rod, and the lower support rod is connected to the lower arm; when the folding support rod assembly is lowered, the lower arm rotates toward the ground by its own gravity and drives the various components of the folding support rod assembly to move. When the lower arm is lowered into place, the elastic force of the locking spring pushes the rocker arm through the dead point where the connecting rod is connected to the rocker arm, and the unlocking joint is rotated to the locking angle to realize the locking of the folding support rod assembly. The stopper on the rocker arm contacts and cooperates with the lower support rod, which can transmit the compression load of the folding support rod assembly. When unlocking, use a fixed wrench to twist the outer hexagonal joint on the unlocking joint or insert the inner hexagonal wrench into the circular hole on the unlocking joint and rotate the unlocking joint. Under the action of the unlocking curved surface, the unlocking joint pulls the shaft, rotates the rocker arm through the dead point and compresses the locking spring. After the unlocking joint is rotated into place, the concave on the joint ensures that the unlocking joint does not slide back under the action of the spring force, thereby realizing reliable unlocking. After the unlocking is completed, the lower arm can be retracted.

[0015] Suction cup assembly and casters and their retractable and retractable mechanisms are installed on both the lifting bracket and the extension bracket. The suction cup is connected with a ball joint, which allows the bracket to adapt to a certain degree of uneven ground. The suction cup is connected to the arm by a connecting bolt, which has a through hole and a tower-type pipe joint at the other end. The tower-type pipe joint can be blocked to achieve the use of the suction cup assembly alone, or the tower-type pipe joint can be connected with a hose and connected to a vacuum pump to meet the test scenario that requires the suction cup to be fully sucked. The height of the suction cup can be adjusted by adjusting the washer.

[0016] Furthermore, the caster assembly is connected to the bracket through the caster mounting plate. When the caster is lowered, the caster retracting handle is pressed down, and the caster retracting handle pushes the slide bar through the connecting rod to extend the caster. After the caster is extended, the suction cup assembly is lifted off the ground, disconnecting the suction cup assembly from the ground. After the caster retracting handle rotates past the dead point position, the stopper on the caster retracting handle contacts the caster mounting plate to prevent the caster retracting handle from continuing to rotate, and the caster retracting mechanism is naturally locked under the action of the gravity of the bracket.

[0017] Beneficial effects of the present invention: a. In the present invention, three specifications of lifting brackets with use heights of 300mm-430mm, 430mm-690mm, and 680mm-1100mm and extension brackets with use heights of 700mm and 1100mm are designed, so that the excitation height covers 300mm-2200mm, which can meet the ground vibration test requirements of most aircraft within 30 tons;

[0018] b. After the support rods are unfolded, the arm span of the bracket can reach 940mm. When the bracket is laterally excited at the maximum height, the bracket can have sufficient lateral stability within the commonly used excitation force;

[0019] c. After the suction cup is connected to the ground, the weight of the bracket and the exciter is sufficient to ensure that the bracket will not slide during lateral excitation;

[0020] d. The convenient caster retractable mechanism greatly shortens the test preparation time and reduces the workload of test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the expansion support rod of the present invention;

[0023] Figure 3 This is a schematic diagram of recovering the support rods of the extended stent of the present invention;

[0024] Figure 4 This is a schematic diagram of the lifting bracket and the extension bracket of the present invention in combined use;

[0025] Figure 5 This is a cross-sectional view of the lifting bracket of the present invention;

[0026] Figure 6 It is a schematic diagram of the composition of the folding support rod assembly of the present invention;

[0027] Figure 7 This is a schematic diagram of the structure of the suction cup assembly of the present invention;

[0028] Figure 8 It is a schematic diagram of the caster retracting and extending mechanism of the present invention.

[0029] Among them, 1-exciter mounting plate, 2-screw, 3-drive nut, 4-movable ratchet, 5-lifting handle, 6-diagonal pull rod, 7-outer cylinder, 8-support arm, 9-suction cup assembly, 10-castor and its retracting and releasing mechanism, 11-adapter plate, 12-column, 13-folding support rod assembly, 14-lower support arm assembly, 15-tapered roller bearing, 16-locking screw, 17-stop block, 18-anti-rotation groove, 19-support ring, 20-anti-rotation cone surface, 21-protective cover, 22-handle support clamp, 23-upper support rod, 24-lower support rod, 25-connecting rod, 26-rocker arm, 27-shaft, 28-locking spring, 29-joint, 30-unlocking joint, 31-unlocking curved surface, 32-stop platform, 33-ball joint suction cup, 34-connecting bolt, 35-adjusting washer, 36-tower type pipe joint and sealing ring, 37-castor retracting and extending handle, 38-connecting rod, 39-sliding rod, 40-castor, 41-stop platform, 42-castor mounting plate. DETAILED DESCRIPTION

[0030] 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.

[0031] See attached Figures 1 to 8As shown, it includes a lifting bracket and an extended bracket. The exciter is connected to the bracket through the exciter mounting plate 1. The connection surface between the exciter mounting plate 1 and the screw 2 is a conical surface, which realizes convenient installation of the two and ensures the connection stiffness between the two. The screw 2 is connected to the drive nut 3, and the screw 2 is driven by rotating the drive nut 3 to realize the lifting and lowering of the bracket. The lifting handle 5 is installed on the handle support clamp 22, and a movable ratchet 4 is installed on the handle support clamp 22. The movable ratchet 4 is engaged with the ratchet groove on the drive nut 3, and the force of the lifting handle 5 is transmitted to the drive nut 3 to rotate the drive nut 3. The direction of the movable ratchet 4 can realize the rotation of the drive nut 3 in different directions. The drive nut 3 is connected to the outer cylinder 7 through a tapered roller bearing 15 to reduce the resistance when lifting the bracket. The screw 2 is provided with an anti-rotation groove 18, which cooperates with the stop block 17 to prevent the screw 2 from rotating. After the lifting and lowering is completed, the locking screw 16 is tightened to reduce the gap between the outer cylinder 7, the stop block 17 and the screw 2, so that the screw 2 is locked. A wear-resistant support ring 19 is installed at the end of the screw 2 to improve the support rigidity of the screw 2, enhance the overall rigidity of the bracket, and prevent friction between the screw and the outer cylinder.

[0032] The lifting bracket is connected to the extension bracket through the adapter plate 11. The extension bracket bears the vertical load through the column 12. When the excitation point is high, the folding strut assembly 13 and the lower arm 14 can be opened to increase the length of the lateral arm of the bracket, thereby improving the lateral stability of the bracket. The folding strut assembly 13 can be quickly retracted and automatically locked after being put down to prevent the folding strut assembly 13 from being accidentally retracted. The upper strut 23 of the folding strut assembly 13 is connected to the lower strut 24, and the lower strut 24 is connected to the lower arm 14. When the folding strut assembly 13 is lowered, the lower arm 14 rotates toward the ground by its own gravity, and drives the various components of the folding strut assembly 13 to move. When the lower arm 14 is lowered into place, the elastic force of the locking spring 28 pushes the rocker arm 26 through the dead point where the connecting rod 25 and the rocker arm 26 are connected, and the unlocking joint 30 rotates to the locking angle to realize the locking of the folding strut assembly 13. The stopper 32 on the rocker arm 26 contacts and cooperates with the lower strut, which can transmit the compression load of the folding strut assembly 13. When unlocking, use a fixed wrench to twist the outer hexagonal joint on the unlocking joint 30 or insert the inner hexagonal wrench into the circular hole on the unlocking joint 30 and rotate the unlocking joint 30. Under the action of the unlocking curved surface 31, the unlocking joint 30 pulls the shaft 27, rotates the rocker arm 26 through the dead point and compresses the locking spring 28. After the unlocking joint 30 is rotated into place, the concave on the joint 29 ensures that the unlocking joint 30 does not slide back under the action of the spring force, thereby realizing reliable unlocking. After unlocking is completed, the lower arm 14 can be retracted.

[0033] Suction cup assembly 9 and casters and their retractable and retractable mechanisms 10 are installed on both the lifting bracket and the extended bracket. The suction cup 33 is connected by a ball joint, which allows the bracket to adapt to a certain degree of uneven ground. The suction cup 33 is connected to the support arm 8 by a connecting bolt 34, which has a through hole and a tower-shaped pipe joint 36 at the other end. The tower-shaped pipe joint 36 can be blocked to realize the use of the suction cup assembly 9 alone, or the tower-shaped pipe joint 36 can be connected with a hose and connected to a vacuum pump to meet the test scenario that requires the suction cup to be fully sucked. The height of the suction cup 33 can be adjusted by adjusting the washer 35.

[0034] The caster assembly 10 is connected to the bracket through the caster mounting plate 42. When the caster is lowered, the caster retracting handle 37 is pressed down, and the caster retracting handle 37 pushes the slide bar 39 through the connecting rod 38 to extend the caster 40. After the caster 40 is extended, the suction cup assembly 9 is lifted off the ground, disconnecting the suction cup assembly 9 from the ground. After the caster retracting handle 37 rotates past the dead point position, the stopper 41 on the caster retracting handle 37 contacts the caster mounting plate 42 to prevent the caster retracting handle 37 from continuing to rotate, and the caster retracting mechanism is naturally locked under the action of the gravity of the bracket.

[0035] The test stand designed as above in the present invention has the following design features and can meet the stringent test requirements:

[0036] a. Adapt to a sufficiently large height range;

[0037] In the present invention, the lifting kinetic energy of the mounting bracket adopts the method of a nut driving a screw rod. In this method, the screw rod stroke cannot be designed to be too large, otherwise it will not be able to cover the low-height test, and the size of the bracket body will be larger. In order to adapt to different height ranges, lifting brackets with different strokes and extension brackets with different heights are designed. The test requirements of a larger height range are achieved through the combination of the lifting bracket and the extension bracket. At the same time, the height adaptability and test flexibility of the bracket are enhanced through this modular design.

[0038] b. After the vibrator is installed on the bracket, the lifting and lowering of the vibrator should be simple, labor-saving, fast and without jamming;

[0039] The screw adopts double-line thread to increase the thread lead, so that the screw rises high enough after the nut rotates one circle, realizing the rapid lifting and lowering of the exciter. At the same time, a thread with a smaller tooth height can be used to reduce the space requirement and thus reduce the design difficulty. The screw lifting adopts the method of connecting the handle to the movable ratchet to drive the ratchet nut. The movable ratchet is moved left and right to drive the nut to rotate left and right to realize the lifting and lowering of the screw. The nut is connected to the outer cylinder through a tapered roller bearing that bears the axial force to reduce the friction when the screw is lifted.

[0040] c. After the vibrator is installed on the bracket, there should be no movement of rotation around the axis or deflection around the horizontal plane;

[0041] The connecting surface between the connecting plate and the screw for installing the exciter is designed to be a conical surface, and the connecting plate and the screw are locked by bolts, eliminating the rotation of the connecting plate around the axis of the screw and the deflection around the horizontal line, thereby ensuring the connection stiffness between the exciter and the bracket after installation.

[0042] d. When the vibrator is working, the bracket cannot slide due to the excitation reaction force;

[0043] To prevent the bracket from sliding under the action of the excitation reaction force, the lifting bracket and the extension bracket are connected to the ground through suction cups, which not only increases the friction between the bracket and the ground, but also provides stability when the bracket is subjected to lateral excitation loads.

[0044] e. When the excitation point is high, the bracket should have sufficient lateral stability to prevent the bracket from tipping over during lateral excitation;

[0045] A foldable auxiliary strut is designed on the extended bracket. When the extended bracket is used for high-point excitation, the foldable strut is opened to increase the bracket grounding force arm, thereby enhancing the lateral stability of the bracket. The design of the strut must ensure that there is no significant gap between the mechanisms, thereby ensuring the ability of the strut to provide lateral stiffness. In addition, the strut must be locked after it is lowered to prevent it from being unlocked during the excitation process and causing the stability of the bracket to deteriorate. The unlocking of the strut should be simple and efficient, and no unnecessary security tools should be introduced to increase the test workload.

[0046] f. The bracket should be easy to move.

[0047] During the test preparation, it is usually necessary to move the bracket. In addition, during the test, the bracket needs to be moved to change the excitation point. Therefore, the bracket should have flexible movement capabilities. In the present invention, casters that can be quickly retracted and extended are designed on the bracket. The retraction and extension of the casters are achieved by a rocker arm slide bar mechanism. When the casters are lowered, the rocker arm passes the dead point of the mechanism to form an effective support. When the casters are retracted, the rocker arm is reversed to pass the dead point. In this way, the retraction and extension of the casters can be completed within seconds, which can effectively improve the efficiency of the test preparation.

[0048] The above is only a specific embodiment of the present invention, and the present invention is described in detail. The unexplained part is a conventional technology. However, the protection scope of the present invention is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A modular high stability exciter mounting bracket, characterized in that: include: A lifting bracket and an extension bracket, wherein the lifting bracket is arranged at the upper end of the extension bracket; the extension bracket is fixed on the work surface, and a folding support rod assembly is arranged on its side for auxiliary support of the extension bracket; an exciter mounting plate is fixed on the upper end of the lifting bracket for installing and fixing the exciter, and the height of the exciter mounting plate is adjustable.

2. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The lifting bracket is provided with a height adjustment component to achieve height adjustment of the exciter mounting plate.

3. A modular high stability exciter mounting bracket as claimed in claim 1 or 2, characterized in that: The lifting bracket comprises: a screw rod, a driving nut, a movable ratchet, a lifting handle, a diagonal tie rod, an outer tube, and a support arm; a base platform of the lifting bracket is composed of multiple sections of the support arm, and the outer tube is arranged at the center of the base platform; one end of the screw rod extends into the outer tube, and the other end is connected to the exciter mounting plate; a diagonal tie rod auxiliary support is arranged between the base platform and the outer tube; The screw is connected to the drive nut; the lifting handle is installed on the handle supporting clamp, and a movable ratchet is installed on the handle supporting clamp. The movable ratchet engages with the ratchet groove on the drive nut to transmit the force of the lifting handle to the drive nut to rotate the drive nut. The direction of the movable ratchet is turned to realize the rotation of the drive nut in different directions, thereby realizing the lifting and lowering adjustment of the lifting bracket.

4. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The driving nut cooperates with the outer cylinder through a tapered roller bearing to reduce resistance when the bracket is lifted or lowered.

5. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The screw rod is provided with an anti-rotation groove which cooperates with a stop block to prevent the screw rod from rotating.

6. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: After the lifting is completed, tighten the locking screw to reduce the gap between the outer cylinder, the stop block and the screw to lock the screw.

7. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: A wear-resistant support ring is installed at the end of the screw.

8. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The extended bracket bears the vertical load through the column. When the excitation point is high, the folding support rod assembly and the lower arm can be opened to increase the length of the lateral arm of the bracket, thereby improving the lateral stability of the bracket.

9. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The upper support rod (23) of the folding support rod assembly is connected to the lower support rod (24), and the lower support rod (24) is connected to the lower support arm (14); when the folding support rod assembly (13) is lowered, the lower support arm (14) rotates toward the ground by its own gravity, and drives the various components of the folding support rod assembly (13) to move. When the lower support arm (14) is lowered into place, the elastic force of the locking spring (28) pushes the rocker arm (26) through the dead point where the connecting rod (25) and the rocker arm (26) are connected, and the unlocking joint (30) rotates to the locking angle to realize the locking of the folding support rod assembly (13), and the stop platform (32) on the rocker arm (26) contacts the lower support rod. When unlocking, use a fixed wrench to twist the outer hexagonal joint on the unlocking joint (30) or insert an inner hexagonal wrench into the round hole on the unlocking joint (30) and rotate the unlocking joint (30). Under the action of the unlocking curved surface (31), the unlocking joint (30) pulls the shaft (27), rotates the rocker arm (26) past the dead point and compresses the locking spring (28). After the unlocking joint (30) is rotated into place, the concave on the joint (29) ensures that the unlocking joint (30) does not slide back under the action of the spring force, thereby achieving reliable unlocking. After the unlocking is completed, the lower support arm (14) can be retracted. A suction cup assembly (9) and casters and a retractable and retractable mechanism (10) are installed on both the lifting bracket and the extension bracket; the suction cup (33) is connected by a ball joint, so that the bracket can adapt to a certain degree of uneven ground; the suction cup (33) is connected to the support arm (8) by a connecting bolt (34); a through hole is opened on the connecting bolt (34), and a tower-shaped pipe joint (36) is installed at the other end; the tower-shaped pipe joint (36) is sealed to realize the use of the suction cup assembly (9) alone, or the tower-shaped pipe joint (36) is connected by a hose and connected to a vacuum pump, which can meet the test scenario that requires the suction cup to be completely sucked; the height of the suction cup (33) can be adjusted by adjusting the gasket (35).

10. A modular high stability exciter mounting bracket as claimed in claim 1, characterized in that: The caster assembly (10) is connected to the bracket through the caster mounting plate (42). When the caster is lowered, the caster retracting handle (37) is pressed down, and the caster retracting handle (37) pushes the sliding rod (39) through the connecting rod (38) to extend the caster (40). After the caster (40) is extended, the suction cup assembly (9) is lifted off the ground, and the connection between the suction cup assembly (9) and the ground is disconnected; after the caster retracting handle (37) rotates past the dead point position, the stopper (41) on the caster retracting handle (37) contacts the caster mounting plate (42) to prevent the caster retracting handle (37) from continuing to rotate, and the caster retracting mechanism is naturally locked under the action of the gravity of the bracket.

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