Workpiece positioning device for a high-precision vibration table

Abstract

The application discloses a workpiece positioning device of a high-precision vibration table, which comprises a chassis, a center supporting mechanism fixed to a center area of the chassis, and a plurality of lateral clamping mechanisms arranged on the chassis around the center supporting mechanism. The lateral clamping mechanism comprises a driver, a transmission shaft, a first chuck and a second chuck. The driver is arranged on the periphery of the chassis. The inner end of the transmission shaft is provided with the first chuck and the second chuck, and the outer end of the transmission shaft is in transmission connection with the driver. The synchronous driving type lateral clamping mechanism arranged around the center supporting mechanism ensures that the workpiece is completely balanced in the radial force. The unique screw nut transmission and support sleeve guiding structure enable each transmission shaft to move along the strict radial direction, thereby avoiding the problems of workpiece deviation, torsion or installation stress concentration caused by unilateral force or sequential locking of the traditional clamp.

Description

Technical Field

[0001] This application relates to the field of vibration testing technology, specifically to a workpiece positioning device for a high-precision vibration table. Background Technology

[0002] Vibration testing is a crucial testing method for evaluating the reliability and performance stability of products under dynamic environments, and it is widely used in high-tech fields such as aerospace, precision instruments, and automotive parts. During vibration testing, the workpiece under test needs to be securely mounted on the vibration table using a positioning device to ensure that the vibration excitation is accurately and without distortion transmitted to the workpiece. However, traditional workpiece positioning methods have several technical bottlenecks: traditional fixtures often use direct bolt clamping or unidirectional clamping structures, resulting in low clamping efficiency and difficulty in achieving synchronous and balanced force application at multiple points. During installation, if there are differences in the sequence of actions or uneven force distribution at each clamping point, it can easily lead to initial stress concentration or installation posture deviation in the workpiece. This introduces additional testing interference factors, seriously affecting the accuracy and reliability of the test data.

[0003] Secondly, for precision workpieces with irregular bottom surfaces or requiring precise alignment, traditional rigid support structures lack adaptive adjustment capabilities. Gaps or poor contact can easily exist between the workpiece and the support surface, not only generating uncontrollable fretting friction during vibration and affecting test results, but also potentially causing workpiece surface damage due to excessive local stress.

[0004] Furthermore, in high-frequency, high-acceleration vibration environments, the insufficient rigidity and structural gaps of traditional fixtures can easily lead to resonance, resulting in decreased clamping force or even loosening of the fixtures, posing a safety risk to the test. At the same time, existing positioning devices often have poor interface compatibility with specific vibration tables, and the installation and positioning process is cumbersome, reducing testing efficiency. Summary of the Invention

[0005] The technical problem to be solved by this application is to overcome the existing defects and provide a workpiece positioning device for a high-precision vibration table, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a workpiece positioning device for a high-precision vibration table, including a base frame and further including: a central support mechanism fixed to the central region of the base frame;

[0007] Multiple lateral clamping mechanisms are arranged on the base frame around the central support mechanism;

[0008] The lateral clamping mechanism includes a driver, a drive shaft, a first chuck, and a second chuck;

[0009] The driver is located on the periphery of the base frame;

[0010] The inner end of the drive shaft is provided with the first chuck and the second chuck, and the outer end of the drive shaft is connected to the driver for transmission.

[0011] The driver is configured to drive the drive shaft to move radially, causing all the first and second chucks to radially approach or move away from the central support mechanism, so as to jointly clamp or release the workpiece.

[0012] As a preferred technical solution of this application, the lateral clamping mechanism adopts a screw transmission mechanism, including an adjusting shaft as an input component and a transmission shaft as an output component, and the end of the transmission shaft is provided with a screw sleeve corresponding to the adjusting shaft.

[0013] As a preferred technical solution of this application, the lateral clamping mechanism further includes a support frame, which includes a pad, a first support seat, and a second support seat. The first support seat and the second support seat are disposed on the front and rear surfaces of the pad, and a support sleeve is axially fixedly installed on the first support seat and the second support seat. The transmission shaft is slidably inserted into the support sleeve.

[0014] As a preferred technical solution of this application, the central support mechanism is a pillar with adjustable height and a universal ball joint at the top.

[0015] As a preferred technical solution of this application, the support column includes: a base, fixed on the base frame;

[0016] A ball-shaped head is mounted on the base.

[0017] The support rod has its lower end connected to the ball head seat via a ball head to form a universal ball joint, and its upper end is provided with a bracket for supporting the workpiece.

[0018] As a preferred technical solution of this application, the bracket includes a lower screw section and an upper bracket seat, wherein the screw section is screwed into the adjusting threaded sleeve of the bracket seat.

[0019] As a preferred technical solution of this application, the base frame is further provided with at least three auxiliary mounting seats, which are located on the outside of the lateral clamping mechanism and are provided with mounting top columns.

[0020] As a preferred technical solution of this application, a card holder is provided on one side of the second support base, and the card holder is provided with a through hole corresponding to the adjustment shaft.

[0021] Compared with existing technologies, the advantages of this application are as follows: This application ensures complete radial force balance on the workpiece through a synchronously driven lateral clamping mechanism arranged around the central support mechanism. The unique lead screw and nut transmission and support sleeve guiding structure allow each transmission shaft to move strictly radially, avoiding workpiece offset, torsion, or stress concentration problems caused by unilateral force application or sequential locking in traditional fixtures. The synergistic effect of the first and second chucks, combined with the specially designed groove structure on the first chuck, provides sufficient clamping force while dispersing contact stress, effectively protecting the workpiece surface integrity and providing realistic, interference-free boundary conditions for vibration testing.

[0022] The central support mechanism employs an innovative combination of a universal ball joint and a height-adjustable bracket, enabling automatic centering and angle self-adaptation under the workpiece's own weight. It automatically compensates for unevenness on the workpiece's bottom surface or installation tilt angle, ensuring precise alignment between the workpiece's center of gravity and the vibration table's excitation center. This significantly simplifies the installation and adjustment process, eliminates testing errors caused by misalignment, and is particularly suitable for testing precision components sensitive to installation posture.

[0023] The stable clamping system formed by the four-point symmetrical clamping layout and the central support can maintain a constant clamping force during long-term vibration testing, effectively overcoming the problem of traditional clamps being prone to loosening under vibration, and improving the safety and reliability of testing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this application. Figure 1 .

[0025] Figure 2 This is the main view of this application.

[0026] Figure 3 This is a top view of this application.

[0027] Figure 4 This is a schematic diagram of the structure of this application. Figure 2 .

[0028] In the diagram: 1 Drive shaft, 2 Center support mechanism, 3 Base frame, 4 Auxiliary mounting base, 5 Pad plate, 6 First support base, 7 Second support base, 8 Adjusting shaft, 9 Card slot, 10 Support sleeve, 11 First chuck, 13 Second chuck, 14 Base, 15 Mounting top column. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application (for ease of description and understanding, hereinafter referred to as...), Figure 2(The above is described above). All other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0030] Please see Figure 1-4 This application provides a technical solution: a workpiece positioning device for a high-precision vibration table, which mainly includes a base frame 3, a central support mechanism 2, and four sets of lateral clamping mechanisms evenly arranged around the central support mechanism 2.

[0031] The base frame 3 is typically made of steel or aluminum alloy, and its upper part is precision machined to ensure the flatness of the mounting surface. The central support mechanism 2 is bolted to the center of the base frame 3. Four identical lateral clamping mechanisms are arranged radially symmetrically on the base frame 3, with the central support mechanism 2 as the center. Furthermore, three auxiliary mounting seats 4, distributed at 120-degree intervals, are provided around the lateral clamping mechanisms for mounting the base frame 3 onto an external vibration table.

[0032] Each set of lateral clamping mechanisms is the core of achieving synchronous and precise clamping of the workpiece.

[0033] The driver is located on the periphery of the base frame 3. The adjusting shaft 8 is mounted on the mounting base 9, which is fixed to the support frame. The support frame consists of a pad 5, a first support seat 6, and a second support seat 7. The first support seat 6 and the second support seat 7 are fastened to the front and rear surfaces of the pad 5 by bolts, and a support sleeve 10 is axially fixed between them.

[0034] The drive shaft 1 is slidably inserted into the support sleeve 10, which serves as a guide to ensure that the drive shaft 1 can only move in a strictly radial direction without any wobble. The outer end of the drive shaft 1 is connected to the adjusting shaft 8 via a motion conversion mechanism.

[0035] Specifically, in this embodiment, a lead screw and nut mechanism is used as the motion conversion mechanism: the end of the transmission shaft 1 is provided with an internal thread hole (i.e., lead screw sleeve), which engages with the external thread section at the end of the adjusting shaft 8.

[0036] The inner end of the drive shaft 1 extends to a position close to the workpiece, on which a first chuck 11 and a second chuck 13 are mounted side by side. The difference between the first chuck 11 and the second chuck 13 is that the first chuck 11 is provided with multiple grooves, which facilitates clamping with the workpiece, provides sufficient clamping force, and protects the surface of the workpiece.

[0037] When clamping a disc-shaped test workpiece, the operator rotates four adjusting shafts 8. The rotational motion of the adjusting shafts 8 is converted into linear motion of the drive shaft 1 via a lead screw and nut pair. Driven by the four mechanisms, the drive shaft 1, carrying the first chuck 11 and the second chuck 13, moves precisely radially inward (towards the central support mechanism 2), clamping the outer circumference of the workpiece evenly from four directions. This avoids workpiece offset or jamming caused by unilateral force application.

[0038] The central support mechanism 2 is used to support the central part of the workpiece and has the ability to adaptively adjust its height and angle.

[0039] The mechanism includes a base 14 bolted to the center of the base frame 3. A ball joint is mounted on the base 14. The lower end of the support rod is machined into a ball head, forming a universal ball joint connection with the ball joint. This allows the support rod to tilt arbitrarily within a certain range of cone angles.

[0040] The upper end of the support rod is equipped with a bracket. The bracket specifically consists of a lower screw section and an upper bracket seat. The bottom of the bracket seat is equipped with an adjusting threaded sleeve, which is screwed onto the screw section. By rotating the bracket seat, the height of its top relative to the base frame 3 can be finely adjusted.

[0041] When placing the workpiece, the universal ball joint of the central support mechanism 2 allows the bracket to automatically adjust to the most suitable angle under the workpiece's own weight. Subsequently, by rotating the bracket seat for fine-tuning the height, the installation flatness of the workpiece can be precisely controlled. At this time, the angle of the first chuck 11 is adjusted so that the slot on the first chuck 11 clamps the workpiece, ensuring that the first chuck 11 and the second chuck 13 can clamp the edge of the workpiece, thus improving the stability of use.

[0042] Three auxiliary mounting bases 4 are located outside the lateral clamping mechanism. Each auxiliary mounting base 4 is equipped with an adjustable height mounting top column 15. The space between the auxiliary mounting base 4 and the mounting top column 15 is engaged with the external worktable, which can quickly realize installation and disassembly and improve the convenience of assembly.

[0043] In use: The entire positioning device is fixed to the working surface of the external vibration table by the three auxiliary mounting seats 4 around the base frame 3. Adjust the height of each mounting column 15 to ensure it is in stable contact with the working surface of the vibration table;

[0044] The workpiece to be tested is gently placed on the bracket of the central support mechanism 2. Under the action of the workpiece's own weight, the support rod automatically adjusts its angle through the universal ball joint structure at the lower end, so that the bracket seat is fully in contact with the bottom surface of the workpiece. Then, the bracket seat is rotated, and the height is finely adjusted through the cooperation of the screw section and the adjusting threaded sleeve, so that the workpiece reaches the required mounting flatness and ensures that the center of gravity of the workpiece is aligned with the excitation center of the vibration table.

[0045] After the initial positioning of the workpiece is completed, the radial movement of the transmission shaft 1 is achieved by synchronously rotating four adjusting shafts 8. The rotational motion is converted into the radial linear motion of the transmission shaft 1 through the lead screw and nut mechanism. The rotation of the adjusting shafts 8 drives the transmission shaft 1 to move inward along the support sleeve 10.

[0046] The first chuck 11 and the second chuck 13, which are installed on the inner end of the drive shaft 1, move toward the workpiece synchronously. The angle of the first chuck 11 is specially adjusted so that one of the multiple grooves on its surface forms the best engagement state with the edge of the workpiece.

[0047] The second chuck 13 also provides auxiliary support, forming a four-point symmetrical clamping layout. After applying the preload, the contact between each chuck and the workpiece is checked to ensure that the groove of the first chuck 11 is fully engaged with the edge of the workpiece, that the force at each clamping point is uniform, and that the workpiece does not shift or deform. Then, the vibration table can be started for testing. During vibration, the universal ball joint structure of the central support mechanism 2 can continue to compensate for any possible slight displacements, maintaining a uniform distribution of clamping force.

[0048] After the test, rotate each adjusting shaft 8 in the opposite direction synchronously to retract the lateral clamping mechanism radially, allowing the workpiece to be safely removed. This achieves a balance between rapid clamping and precise positioning, improving the efficiency and reliability of vibration testing.

[0049] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A workpiece positioning device for a high-precision vibration table, comprising a base frame (3), characterized in that, Also includes: The central support mechanism (2) is fixed to the central area of ​​the base frame (3); Multiple lateral clamping mechanisms are arranged around the central support mechanism (2) on the base frame (3); The lateral clamping mechanism includes a driver, a drive shaft (1), a first chuck (11), and a second chuck (13). The driver is located on the periphery of the base frame (3); The inner end of the drive shaft (1) is provided with the first chuck (11) and the second chuck (13), and the outer end of the drive shaft (1) is connected to the driver for transmission. The driver is configured to drive the drive shaft (1) to move radially, so that all the first chucks (11) and the second chucks (13) move radially closer to or further away from the central support mechanism (2) to jointly clamp or release the workpiece.

2. The workpiece positioning device for a high-precision vibration table according to claim 1, characterized in that, The lateral clamping mechanism adopts a screw drive mechanism, including an adjusting shaft (8) as an input component and a drive shaft (1) as an output component. The end of the drive shaft (1) is provided with a screw corresponding to the adjusting shaft (8).

3. The workpiece positioning device for a high-precision vibration table according to claim 2, characterized in that, The lateral clamping mechanism further includes a support frame, which includes a pad (5), a first support seat (6), and a second support seat (7). The first support seat (6) and the second support seat (7) are disposed on the front and rear surfaces of the pad (5). The first support seat (6) and the second support seat (7) are axially fixedly mounted with a support sleeve (10). The transmission shaft (1) is slidably inserted into the support sleeve (10).

4. The workpiece positioning device for a high-precision vibration table according to claim 1, characterized in that, The central support mechanism (2) is a height-adjustable support column with a universal ball joint at the top.

5. The workpiece positioning device for a high-precision vibration table according to claim 4, characterized in that, The support includes: a base (14) fixed to the base frame (3); A ball head seat is disposed on the base (14); The support rod has its lower end connected to the ball head seat via a ball head to form a universal ball joint, and its upper end is provided with a bracket for supporting the workpiece.

6. The workpiece positioning device for a high-precision vibration table according to claim 5, characterized in that, The bracket includes a lower screw section and an upper bracket seat, and the screw section is screwed into the adjusting threaded sleeve of the bracket seat.

7. The workpiece positioning device for a high-precision vibration table according to claim 1, characterized in that, The base frame (3) is also provided with at least three auxiliary mounting seats (4), which are located on the outside of the lateral clamping mechanism and are provided with mounting top posts (15).

8. The workpiece positioning device for a high-precision vibration table according to claim 3, characterized in that, A card holder (9) is provided on one side of the second support base (7), and the card holder (9) is provided with a through hole corresponding to the adjusting shaft (8).

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