Experimental low-frequency vibration table

Abstract

The utility model discloses a low-frequency vibration table for experiments. The low-frequency vibration table mainly comprises a base, a vibration table body, a sliding platform, a marking plate and an auxiliary fixing mechanism. A ratchet ring is fixedly mounted in the auxiliary fixing mechanism; the vibration table transmits vibration to the sliding platform, then the vibration is transmitted to the marking plate, the marking paper is placed on the marking plate, the two ends of the marking paper are clamped by the auxiliary fixing mechanisms so as to prevent the marking paper from vibrating, and the auxiliary fixing mechanisms rotationally pull the marking paper to be tightened and lock the marking paper through the ratchet rings. According to the utility model, the problem that the marking paper is easily disturbed to generate self-vibration in a machine vision vibration test experiment is solved, the accuracy of experimental data can be effectively improved, and operators can conveniently mount and dismount the marking paper to a certain extent.

Description

Technical Field

[0001] This application relates to the field of machine vision experiments, specifically to a low-frequency vibration table for experiments. Background Technology

[0002] Vibration during operation is one of the main factors affecting the safety performance of electric locomotives. It not only accelerates the wear of parts and shortens the maintenance cycle, but excessive vibration may also lead to traffic safety accidents. Rolling vibration test benches have become key equipment for testing and optimizing locomotive performance because they can simulate various locomotive operating conditions and track conditions. The measurement of their vibration parameters is particularly important. However, traditional vibration measurement methods mainly rely on contact sensors. While this method is simple and flexible, its measurement accuracy is often limited, making it difficult to meet the demands of high-precision measurements. Therefore, there is an urgent need to research a laser Doppler linear velocity measurement method, establish a laser Doppler linear velocity detection platform, and achieve online high-precision measurement of locomotive running speed, thereby improving the performance parameters of rolling vibration test benches. To verify the feasibility of using the laser Doppler linear velocity measurement method, a machine vision-based vibration measurement performance verification system needs to be built. This system uses a long-thread low-frequency vibration table equipped with contrast marker paper, and a camera to capture motion sequence images of the feature markers. Simultaneously, a heterodyne interferometer (OFV 5000) is used to measure linear displacement for comparative verification. The low-frequency vibration table can provide sinusoidal excitation with a maximum amplitude of 250 mm within a frequency range of 0.01–200 Hz. A CMOS camera with a maximum frame rate of 227 and a maximum resolution of 1.6 megapixels is selected.

[0003] During this process, the feature markers need to be fastened to the working surface of the low-frequency vibration table to ensure that the markers and the working surface have consistent motion characteristics. Currently, the low-frequency vibration table does not have a matching structure to fasten the marking paper. Usually, the marking paper can only be fixed by pasting. The marking paper is prone to vibration when disturbed during the movement, which affects the accuracy of the experimental data. Utility Model Content

[0004] The purpose of this invention is to provide a low-frequency vibration table for experiments, which aims to solve the problems mentioned above.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a low-frequency vibration table for experiments, comprising a base, a vibration table, a sliding platform, a marking plate, and an auxiliary fixing mechanism for fixing the marking paper by rotation; the lower end of the vibration table is fixedly connected to the base, the sliding platform is electrically slidably connected to the inside of the vibration table via a slide rail, the marking plate is bolted to the upper surface of the sliding platform, and the auxiliary fixing mechanism is disposed at the upper end of the sliding platform;

[0006] A ratchet ring is fixedly installed inside the auxiliary fixing mechanism; the vibration table transmits the vibration to the sliding platform, and then to the marking plate. The marking paper is placed on the marking plate, and the two ends of the marking paper are clamped by the auxiliary fixing mechanism to prevent the marking paper from vibrating on its own. The rotation of the auxiliary fixing mechanism pulls the marking paper taut and locks it through the ratchet ring.

[0007] The auxiliary fixing mechanism clamps the label paper during label paper replacement and rotates it by pulling on both sides, keeping the label paper taut and attached to the labeling plate. This allows the label paper to move synchronously under the drive of the vibration table, reducing its own vibration, effectively improving the accuracy of experimental data, and facilitating the replacement and fixing of the label paper.

[0008] Furthermore, the auxiliary fixing mechanism has two sets positioned behind the marking plate on both sides; the base is placed on the upper part of the experimental platform, and a camera device is also installed on the experimental platform. The vibration table and the camera device are respectively connected to the controller via electrical signals.

[0009] Furthermore, the auxiliary fixing mechanism includes a support tube, a notched column, a clamping column, a connecting rod, a rotating handle, and a spring. The lower end of the support tube is fixedly connected to the upper end of the sliding platform, the lower end of the notched column is rotatably connected to the upper end of the sliding platform, the notched column is positioned inside the support tube and coaxial with the support tube, the lower end of the clamping column is rotatably connected to the upper end of the sliding platform, the notched column and the clamping column use the same rotation track, one end of the spring is fixedly connected to the side of the notched column, the other end of the spring is fixedly connected to the side of the clamping column, one end of the connecting rod is welded and fixed to the upper end of the clamping column, the other end of the connecting rod is inserted into the side of the rotating handle, and the lower end of the rotating handle is rotatably connected to the upper end of the notched column. The springs are arranged in an array evenly distributed from top to bottom. A rubber block is fixedly installed on the side of the clamping column away from the spring, and a rubber block is fixedly installed on the side of the notched column close to the clamping column.

[0010] Furthermore, a through paper feed hole is provided at the front end of the support tube, and an annular receiving groove is provided at the lower part of the support tube. A pawl is hinged in the receiving groove, and the pawls are evenly distributed along the circumference of the receiving groove. The hinge between the pawl and the receiving groove is equipped with a limit and a torsion spring. The ratchet ring is fixedly connected to the lower part of the toothed post, and the clamping post is slidably connected to the inner wall of the ratchet ring. The pawl and the ratchet ring are at the same horizontal position.

[0011] Compared with existing technologies, it has the following beneficial effects:

[0012] This invention provides a low-frequency vibration table for experiments. By setting an auxiliary fixing mechanism, the marking paper is clamped and rotated on both sides during marking paper replacement, so that the marking paper is in a state of tight adhesion to the marking plate. This allows the marking paper to move synchronously under the drive of the vibration table, reducing the vibration of the marking paper itself. This can effectively improve the accuracy of experimental data and facilitate the replacement and fixing of the marking paper. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of an experimental low-frequency vibration table according to the present invention.

[0014] Figure 2 This is a schematic diagram of a marking plate for an experimental low-frequency vibration table according to the present invention;

[0015] Figure 3 This is a partial schematic diagram of an auxiliary fixing mechanism for a low-frequency vibration table for experiments according to the present invention.

[0016] Figure 4 This is a cross-sectional schematic diagram of an auxiliary fixing mechanism for a low-frequency vibration table used in experiments according to the present invention.

[0017] Figure 5 This is a cross-sectional view from another angle of the auxiliary fixing mechanism of the experimental low-frequency vibration table of this utility model.

[0018] In the diagram: 1-Base; 2-Vibration table; 3-Sliding platform; 4-Marker plate; 5-Auxiliary fixing mechanism; 51-Support tube; 511-Paper feed hole; 512-Receiving groove; 513-Pawl; 52-Notch post; 53-Clamping post; 54-Connecting rod; 55-Rotating handle; 56-Spring; 57-Rubber block; 6-Ratchet ring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1 to 5 As shown, this utility model provides the following technical solution: a low-frequency vibration table for experiments, including a base 1, a vibration table 2, a sliding platform 3, a marking plate 4, and an auxiliary fixing mechanism 5 for fixing the marking paper by rotation; the lower end of the vibration table 2 is fixedly connected to the base 1, the sliding platform 3 is electrically slidably connected to the inside of the vibration table 2 through a slide rail, the marking plate 4 is bolted to the upper surface of the sliding platform 3, and the auxiliary fixing mechanism 5 is set at the upper end of the sliding platform 3;

[0021] A ratchet ring 6 is fixedly installed inside the auxiliary fixing mechanism 5; the vibration table 2 transmits the vibration to the sliding platform 3, and then to the marking plate 4. The marking paper is placed on the marking plate 4. The two ends of the marking paper are clamped by the auxiliary fixing mechanism 5 to prevent the marking paper from vibrating on its own. The rotation of the auxiliary fixing mechanism 5 pulls the marking paper taut and locks it through the ratchet ring 6.

[0022] See Figure 1 The auxiliary fixing mechanism 5 is provided with two sets positioned on the rear sides of the marking plate 4; the base 1 is placed on the upper part of the experimental platform, and a camera device is also provided on the experimental platform.

[0023] The preferred marking pattern consists of four circles with a diameter of 15mm and a line with a length of 60mm and a width of 0.5mm, printed on a piece of paper of a specific size, with a certain length of space on both sides to assist the fixing mechanism 5 in clamping and locking. A sinusoidal excitation with a maximum amplitude of 250mm is preferably used within the frequency range of 0.01~200Hz. A CMOS camera (MER2-160-227U3M) with a maximum frame rate of 227 and a maximum resolution of 1.6 million pixels is selected to acquire motion sequence images of the marking pattern. Simultaneously, a heterodyne interferometer (OFV 5000) is used to measure linear displacement for comparative verification.

[0024] The vibration table 2 and the camera device are electrically connected to the controller. The images are transmitted back to the controller for image data analysis and extraction.

[0025] As another embodiment, such as Figures 2 to 5 As shown, the auxiliary fixing mechanism 5 includes a support tube 51, a notched column 52, a clamping column 53, a connecting rod 54, a rotating handle 55, and a spring 56. The lower end of the support tube 51 is fixedly connected to the upper end of the sliding platform 3, the lower end of the notched column 52 is rotatably connected to the upper end of the sliding platform 3, the notched column 52 is positioned inside the support tube 51 and is coaxial with the support tube 51, the lower end of the clamping column 53 is rotatably connected to the upper end of the sliding platform 3, the notched column 52 and the clamping column 53 use the same rotation track, one end of the spring 56 is fixedly connected to the side of the notched column 52, the other end of the spring 56 is fixedly connected to the side of the clamping column 53, one end of the connecting rod 54 is welded and fixed to the upper end of the clamping column 53, the other end of the connecting rod 54 is inserted into the side of the rotating handle 55, and the lower end of the rotating handle 55 is rotatably connected to the upper end of the notched column 52.

[0026] In this process, the spring 56 pushes the clamping post 53 to apply force to the notch of the notch post 52. By rotating the rotating handle 55, the rotating rod is driven to rotate, which in turn drives the clamping post 53 away from the notch post 52 and compresses the spring 56, forming a gap between the notch post 52 and the clamping post 53 to place the side of the marking paper. During this process, the notch post 52 cannot be driven to rotate due to the restriction of the ratchet ring 6. After the rotating handle 55 is released, the spring 56 is released, pushing the clamping post 53 to press the marking paper, so that the clamping post 53 and the notch post 52 clamp and fix the marking paper.

[0027] After the marking paper is clamped, the rotating handle 55 is rotated in the opposite direction, causing the clamping column 53 to rotate in the opposite direction, which in turn pushes the toothed column to rotate, pulling the side of the marking paper to move. The auxiliary fixing mechanisms 5 on both sides can be operated simultaneously to make the marking paper tightly adhere to the marking plate 4.

[0028] See Figure 3 and Figure 5 As shown, the spring 56 is provided with an array of springs evenly arranged from top to bottom. A rubber block 57 is fixedly provided on the side of the clamping post 53 away from the spring 56, and a rubber block 57 is fixedly provided on the side of the notch post 52 close to the clamping post 53.

[0029] Among them, the rubber block 57 has high friction, which, together with the push of the spring 56, enables the clamping post 53 and the notch post 52 to effectively clamp the side of the marking paper and prevent the marking paper from falling off the auxiliary fixing mechanism 5.

[0030] Under normal conditions, the spring 56 pushes the clamping post 53 close to the toothed post, so that the two sets of rubber blocks 57 are in close contact. By rotating the rotating handle 55 to drive the clamping post 53 to rotate, the two sets of rubber blocks 57 can be separated, and then the side of the marking paper can be inserted.

[0031] See Figures 3 to 5 As shown, the front end of the support tube 51 has a through paper feed hole 511, and the lower part of the support tube 51 has an annular receiving groove 512. A pawl 513 is hinged in the receiving groove 512. The pawl 513 is evenly arranged along the circumference of the receiving groove 512. The hinge between the pawl 513 and the receiving groove 512 is provided with a limit and a torsion spring.

[0032] In the initial state, the notch of the notch post 52 corresponds to the position of the paper feed hole 511. The edge of the notch post 52 and the paper feed hole 511 are engraved with scale lines, which makes it easy for the operator to adjust the auxiliary fixing mechanism 5 back to the initial state. The ratchet ring 6 contacts the pawl 513. The pawl 513 with limit and torsion spring makes the ratchet ring 6 rotate only in one direction, which in turn makes the notch post 52 rotate only in one direction.

[0033] After the notched post 52 and the clamping post 53 have completed the fixing of the marking paper, the rotating handle 55 is rotated in the opposite direction, causing the clamping post 53 to push the notched post 52 to rotate synchronously. At this time, the ratchet ring 6 contacts the rear end of the pawl 513, driving the pawl 513 to rotate into the receiving groove 512. After the pawl 513 disengages from the contact of the ratchet ring 6, it returns to its initial state under the force of the torsion spring and restricts the notched post 52 from reversing, thus locking the notched post and causing the marking paper to be pulled taut on both sides, completing the fixing of the marking paper before the experiment.

[0034] See Figure 5 The ratchet ring 6 is fixedly connected to the lower part of the toothless post, the clamping post 53 is slidably connected to the inner wall of the ratchet ring 6, and the pawl 513 is at the same horizontal position as the ratchet ring 6.

[0035] After the experiment is completed, rotate the handle 55 to make the clamping column 53 rotate in the opposite direction, and the two sets of rubber blocks 57 will separate to remove the marking paper. Then, rotate the handle 55 in reverse again to make the clamping column 53 drive the notch column 52 to rotate one revolution and return to the paper feed hole 511 position, so that the auxiliary fixing mechanism 5 returns to the initial state.

[0036] Working principle: In use, rotating the handle 55 drives the clamping column 53 to rotate away from the notched column 52 and compresses the spring 56, creating a gap between the notched column 52 and the clamping column 53. The side of the marking paper is then placed in. After releasing the handle 55, the spring 56 is released, pushing the clamping column 53 to press against the marking paper, causing the two sets of rubber blocks 57 to clamp and fix the marking paper. Then, rotating the handle 55 in the opposite direction causes the clamping column 53 to rotate in the opposite direction, thereby pushing the notched column to rotate and pulling the side of the marking paper to move. The notched column 52 is locked by the engagement of the ratchet ring 6 and the pawl 513. The auxiliary fixing mechanisms 5 on both sides can be operated simultaneously to make the marking paper tightly adhere to the marking plate 4. After the experiment is completed, rotating the handle 55 causes the clamping column 53 to rotate in the opposite direction, and the two sets of rubber blocks 57 are released to remove the marking paper. Then, rotating the handle 55 in the opposite direction again causes the clamping column 53 to drive the notched column 52 to rotate one revolution and return to the paper feed hole 511 position. The auxiliary fixing mechanism 5 returns to the initial state.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-frequency vibration table for experiments, characterized in that... The system includes a base (1), a vibration table (2), a sliding platform (3), a marking plate (4), and an auxiliary fixing mechanism (5) for fixing the marking paper by rotation. The lower end of the vibration table (2) is fixedly connected to the base (1), the sliding platform (3) is electrically slidably connected to the inside of the vibration table (2) through a slide rail, the marking plate (4) is bolted to the upper surface of the sliding platform (3), and the auxiliary fixing mechanism (5) is located at the upper end of the sliding platform (3). The auxiliary fixing mechanism (5) is fixedly installed with a ratchet ring (6); the vibration table (2) transmits the vibration to the sliding platform (3), and then to the marking plate (4). The marking paper is placed on the marking plate (4). The two ends of the marking paper are clamped by the auxiliary fixing mechanism (5) to prevent the marking paper from vibrating on its own. The auxiliary fixing mechanism (5) rotates and pulls the marking paper to tighten and locks it through the ratchet ring (6).

2. The experimental low-frequency vibration table according to claim 1, characterized in that, The auxiliary fixing mechanism (5) is provided with two sets positioned on the rear sides of the marking plate (4); the base (1) is placed on the upper part of the experimental platform, and the experimental platform is also provided with a camera device.

3. The experimental low-frequency vibration table according to claim 2, characterized in that, The vibration table (2) and the camera device are respectively connected to the controller via electrical signals.

4. The experimental low-frequency vibration table according to claim 2, characterized in that, The auxiliary fixing mechanism (5) includes a support tube (51), a notch post (52), a clamping post (53), a connecting rod (54), a rotating handle (55), and a spring (56); the lower end of the support tube (51) is fixedly connected to the upper end of the sliding platform (3), the lower end of the notch post (52) is rotatably connected to the upper end of the sliding platform (3), the notch post (52) is positioned inside the support tube (51) and is coaxial with the support tube (51), and the lower end of the clamping post (53) is connected to the sliding platform (3). The upper end is rotatably connected, the notched post (52) and the clamping post (53) adopt the same rotation track, one end of the spring (56) is fixedly connected to the side of the notched post (52), the other end of the spring (56) is fixedly connected to the side of the clamping post (53), one end of the connecting rod (54) is welded and fixed to the upper end of the clamping post (53), the other end of the connecting rod (54) is inserted into the side of the rotating handle (55), and the lower end of the rotating handle (55) is rotatably connected to the upper end of the notched post (52).

5. The experimental low-frequency vibration table according to claim 4, characterized in that, The spring (56) is provided with an array of evenly arranged columns from top to bottom. A rubber block (57) is fixedly provided on the side of the clamping column (53) away from the spring (56). A rubber block (57) is fixedly provided on the side of the notch column (52) close to the clamping column (53).

6. The experimental low-frequency vibration table according to claim 5, characterized in that, The support tube (51) has a through paper feed hole (511) at the front end of its end, and an annular receiving groove (512) is provided at the lower part of the support tube (51). A pawl (513) is hinged in the receiving groove (512). The pawl (513) is evenly arranged along the circumference of the receiving groove (512). The hinge between the pawl (513) and the receiving groove (512) is provided with a limit and a torsion spring.

7. The experimental low-frequency vibration table according to claim 6, characterized in that, The ratchet ring (6) is fixedly connected to the lower part of the toothless post, the clamping post (53) is slidably connected to the inner wall of the ratchet ring (6), and the pawl (513) is at the same horizontal position as the ratchet ring (6).

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