Bridge rotation smoothness improving device based on eccentric precession effect of vibrating rotor

Abstract

The invention relates to a bridge rotation smoothness improving device based on the eccentric precession effect of a vibrating rotor, which comprises a rotation bridge and two eccentric precession quick rotation devices, the two eccentric precession quick rotation devices are fixedly arranged at the two ends of the rotation bridge respectively, and a bridge supporting frame is arranged at the lower end of the rotation bridge. The bottom end of the bridge supporting frame is fixedly arranged on a rotating spherical hinge, the rotating spherical hinge is fixedly arranged on a ground plate, and two traction devices are symmetrically arranged on the ground plate in the inclined direction. The invention aims to design and utilize the eccentric rapping rotor auxiliary device with low energy consumption, low mass and low disturbance to activate the power performance of the spherical hinge of the swivel bridge, so that the smoothness and stability of the swivel bridge are improved, and finally, the purpose of a smooth and precise swivel process is achieved.

Description

Technical Field

[0001] The present invention relates to the technology of bridge engineering swivel construction, and more specifically, to a device for improving the smoothness of bridge swiveling based on the eccentric precession effect of a vibrating rotor. Background Art

[0002] Bridge construction needs to span existing obstacles or lines. When it is necessary to cross a busy road or an important railway, whether it is casting in-situ with formwork or prefabricated and assembled, the traditional cantilever construction technology of bridges has the adverse effects of seriously interfering with the operation and safety of existing lines. Thus, the bridge swivel construction technology came into being. The bridge swivel construction technology does not need to occupy the space directly above the crossed line. The main body of the bridge can be constructed along both sides of the line. Only before the bridge is closed, it needs to be swiveled into place, which can minimize the construction interference to the existing line.

[0003] The swivel system of a swivel bridge usually consists of a lower turntable, an upper turntable, a spherical hinge, a slideway, and a traction system. The swiveling process generally forms a rotational couple through the jacks arranged near the bridge piers to pull the traction cables to achieve swiveling. However, as the core rotating device, the spherical hinge located inside the upper and lower turntables is crucial, and its design and construction quality often directly determine the success or failure of swiveling. Taking the spherical hinge structure as the main part, the conventional bridge swivel construction still has the following pain points: (1) Uneven friction: Local friction force mutation occurs on the contact surface of the spherical hinge due to processing errors or impurities, resulting in jamming. If the starting torque exceeds the design value, it will cause the overload of the traction system; (2) Inertia impact: Vibration occurs during the starting / stopping stage due to the conversion between static friction and dynamic friction, which not only affects the alignment accuracy of the swiveling axis but also may cause the swiveling speed to be too fast, potentially leading to the hidden danger of rotational instability; (3) Deviation correction lag: The traction system is single, and only relies on manual monitoring to adjust the traction force. The real-time response speed during the swiveling process is slow, and it is easy to accumulate deviation errors.

[0004] In the field of bridge swivel construction technology, being able to swivel, swiveling stably, and arriving accurately are the three main indicators for evaluating swiveling technology. Among them, swiveling stably occupies the majority of the time in the swiveling construction process. However, except for strengthening monitoring and ensuring the design and construction quality of the spherical hinge, there are currently no other devices and methods that can actively intervene in the stability of bridge swiveling. Currently, there are problems such as swiveling jamming and low swiveling accuracy in swivel bridges due to the malfunction of key swiveling structures such as spherical hinges. The existing bridge swivel construction technology still has problems such as uneven friction, inertia impact, and deviation correction lag. The root cause lies in the high-stress lubricated contact behavior at the complex interface of the rotating spherical hinge and the too large difference between the static and dynamic friction coefficients. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a device for improving the smoothness of bridge swiveling based on the eccentric precession effect of a vibrating rotor, which can achieve the improvement of the smoothness and stability of a swivel bridge.

[0006] The technical solution adopted by the present invention to solve its technical problems is to construct a device for improving the smoothness of bridge rotation based on the eccentric precession effect of a vibrating rotor, which includes a rotating bridge and an eccentric precession speed rotating device. The two eccentric precession speed rotating devices are respectively fixedly arranged at both ends of the rotating bridge. A bridge support frame is arranged at the lower end of the rotating bridge, and the bottom end of the bridge support frame is fixedly arranged on a rotating ball hinge, and the rotating ball hinge is fixedly arranged on a ground plate. Two traction devices are symmetrically arranged obliquely on the ground plate.

[0007] According to the above solution, the eccentric precession speed rotating device includes a rotor, a central bearing and a rotating rod. The rotor and the central bearing are connected by a strip. The central bearing is sleeved on the rotating rod. Both ends of the rotating rod are arranged on the lifting legs. An elevator for actively adjusting the horizontal height of the rotating rod is arranged inside the lifting legs. A fixed leg is arranged at the lower end of the lifting legs, and the fixed leg is fixedly arranged on a bottom plate. Eccentric blocks are symmetrically and fixedly arranged at the outer edge of the rotor. A starting device is arranged outside the rotor, and the starting device is electrically connected to a motor.

[0008] According to the above solution, the starting device is in close contact with or separated from the rotor as the case may be, and the starting device can actively apply a rotational torque to the rotor to drive the rotor to rotate.

[0009] According to the above solution, rubber thin layers for increasing the contact friction coefficient are arranged on the contact surfaces between the starting device and the rotor. The rotor can control the rotational speed at 150 - 300 revolutions per minute according to the rotation requirements of the rotating bridge.

[0010] According to the above solution, the rotor is of a circular ring structure, the outer diameter of the rotor is 80 - 100 cm, and the width is 15 - 25 cm.

[0011] According to the above solution, the total self - weight of the rotor and the eccentric blocks is 1 - 5 tons.

[0012] According to the above solution, the length of the rotating rod is 100 - 200 cm, and the diameter is 10 - 20 cm.

[0013] According to the above solution, the bottom plate is bolt - connected to the rotating bridge.

[0014] According to the above solution, the main body of the eccentric precession speed rotating device is made of Q235 steel.

[0015] Implementing the device for improving the smoothness of bridge rotation based on the eccentric precession effect of a vibrating rotor of the present invention has the following beneficial effects:

[0016] 1. The present invention aims to design and utilize an eccentric vibration-impacting rotor auxiliary device with low energy consumption, low mass, and low disturbance to activate the dynamic performance of the spherical hinge of the rotating bridge, improve the smoothness and stability of the rotating bridge, and ultimately achieve the purpose of a smooth and precise rotating process. It has a minimal impact on the structure and stability of the under-construction rotating bridge, and the excitation vibration amplitude is controlled within a very small range, without causing adverse responses such as structural resonance.

[0017] 2. The eccentric vibration-impacting rotors designed in the present invention are arranged at both ends of the rotating bridge, which can excite the vertical fixed-frequency low-amplitude vibration at the installation position. By means of the long-side dimension of the rotating bridge and the natural vibration frequency of the temporary structure foundation of the rotating bridge, the excitation effect of the rotor is strengthened and amplified at the bridge spherical hinge, achieving "amplifying small vibrations", with controllable costs and energy consumption. Based on the eccentric effect, the fixed-frequency excitation at the spherical hinge is generated by using the vibration-impacting rotor. This excitation behavior has good characteristics of controllable amplitude and vibration frequency. Before the bridge rotation process, it can activate the motion and dynamic characteristics of the lubricating friction pair at the spherical hinge, greatly reduce the static friction coefficient at the spherical hinge contact interface, narrow the gap between the static and dynamic friction coefficients, and improve the smoothness of the bridge rotation.

[0018] 3. The fundamental reason for the large gap between the static and dynamic friction coefficients at the spherical hinge of the rotating bridge designed in the present invention is that the lubricating thin layer of the spherical hinge sliding pair requires dynamic activation. The fixed-frequency vibration at the spherical hinge excited by the eccentric vibration-impacting rotor can activate the lubricating characteristics of the rotating interface before rotation, greatly narrowing the difference between the static and dynamic friction coefficients, with controllable costs and good technical effects. By using the precession effect of the rotor to generate a continuous and stable horizontal precession angular momentum, it can assist in providing the active torque for the bridge rotation, increasing the power source for the rotating bridge and improving the economic benefits of the technical solution.

[0019] 4. Applying an external torque to a high-speed rotating object will induce the precession effect. By applying an external torque in the driving direction to the vibration-impacting device, the precession effect of the rotor can be used to generate a continuous and stable horizontal precession angular momentum, assisting in providing the active torque for the bridge rotation, increasing the power source for the rotating bridge and improving the smoothness of the bridge rotation. Based on the principles such as the rotation effect of the eccentric cam and the precession effect of the rotating object, the activation of the spherical hinge sliding surface is achieved in advance, and an additional torque source is provided, comprehensively solving the problem of insufficient smoothness in the bridge rotation construction, while ensuring that the impact on the structural strength and stability of the under-construction rotating bridge caused by the additional application is minimized, providing a breakthrough solution for the safe, precise, and stable rotation construction of the rotating bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0021] Figure 1 is the application rotating bridge scenario and layout schematic diagram of the device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration-impacting rotor;

[0022] Figure 2 It is a schematic structural diagram of the main body eccentric precession and high-speed rotation device of the present invention;

[0023] Figure 3 It is a side view of the main body eccentric precession and high-speed rotation device of the present invention;

[0024] In the figure: 1. Eccentric precession and high-speed rotation device, 2. Rotating body bridge, 3. Rotating ball hinge, 4. Traction device, 101. Rotor, 102. Eccentric block, 103. Lifting leg, 104. Fixed leg, 105. Central bearing, 106. Starting device, 107. Rotating rod, 108. Lifter, 109. Bottom plate. Specific embodiments

[0025] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] As Figures 1-3 shown, the device for improving the smoothness of the bridge rotating body based on the eccentric precession effect of the vibrating rotor of the present invention includes a rotating body bridge 2 and an eccentric precession and high-speed rotation device 1. There are two eccentric precession and high-speed rotation devices 1, which are respectively fixedly arranged at both ends of the rotating body bridge 2. A bridge support frame is arranged at the lower end of the rotating body bridge 2, and the bottom end of the bridge support frame is fixedly arranged on the rotating ball hinge 3. The rotating ball hinge 3 is fixedly arranged on the ground plate, and two traction devices 4 are symmetrically arranged obliquely on the ground plate. The eccentric precession and high-speed rotation device 1 is the core component of this device.

[0027] In the preferred embodiment of the present invention, the main body of the eccentric precession and high-speed rotation device 1 is made of Q235 steel. The eccentric precession and high-speed rotation device 1 includes a rotor 101, a central bearing 105, and a rotating rod 107. The rotor 101 and the central bearing 105 are connected by a strip. The central bearing 105 is sleeved on the rotating rod 107. Both ends of the rotating rod 107 are arranged on the lifting legs 103 and are limited by the end rod caps. An elevator 108 capable of actively adjusting the horizontal height of the rotating rod 107 is arranged inside the lifting legs 103. Fixed legs 104 are arranged at the lower ends of the lifting legs 103, and the fixed legs 104 are fixedly arranged on the bottom plate 109. Eccentric blocks 102 are symmetrically and fixedly arranged at the outer edge of the rotor 101. In this embodiment, they are symmetrically welded and fixed. A starting device 106 is arranged outside the rotor 101, and the starting device 106 is electrically connected to the motor. The starting device 106 is in close contact with or separated from the rotor 101 as the situation requires. The starting device 106 can actively apply a rotational torque to the rotor 101 to drive the rotor 101 to rotate. Rubber thin layers for increasing the contact friction coefficient are arranged on the contact surfaces between the starting device 106 and the rotor 101. The rotor 101 can control the rotational speed at 150 - 300 revolutions per minute according to the rotation requirements of the rotating body bridge 2.

[0028] In a preferred embodiment of the present invention, the rotor 101 has a ring structure. The outer diameter of the rotor 101 is 80 - 100 cm, and the width is 15 - 25 cm. The total self-weight of the rotor 101 and the eccentric block 102 is 1 - 5 tons, and each design parameter depends on the structural properties of the rotating bridge 2. The length of the rotating rod 107 is 100 - 200 cm, and the diameter is 10 - 20 cm, which depends on the self-weight property of the rotating bridge 2. The bottom plate 109 is bolted to the rotating bridge 2.

[0029] In a preferred embodiment of the present invention, the functions of each part of the structure are as follows: The rotor 101 and the eccentric block 102 form a mass cam, which can cause low-amplitude and fixed-frequency up-and-down vibrations when rotating at high speed. The lifting legs 103 and the fixed legs 104 provide a support space for the central bearing 105. When the lifter 108 actively descends, the lifting leg 103 and the rotating rod 107 are instantaneously disengaged. The rotor 101 rotating at high speed will try to maintain its own rotation posture, thereby inducing a precession effect and generating a precession torque. The starting device 106 can be connected to an external rotating device to provide a rotational torque for the rotor 101 to ensure a stable rotation speed of the rotor 101. On the premise of having little impact on the structure and appearance of the rotating bridge 2 itself, the vibrator motor drives the cam rotor 101 to rotate at high speed, exciting the vertical fixed-frequency and low-amplitude vibrations at the installation position of the rotor 101, and by virtue of the long side dimension of the rotating bridge 2, using the "seesaw" lever principle to amplify the excitation response, achieving the effect of a small-mass vibrating rotor 101 exciting a fixed-frequency excitation at the ball joint of the large-mass rotating bridge 2.

[0030] The working principle of the present invention is as follows:

[0031] The eccentric precession speed-rotating device 1 is arranged at both ends of the deck of the rotating bridge 2. Before the bridge rotation is started by using the traction device 4, the eccentric precession speed-rotating device 1 is first started. After reaching the expected rotation speed, the eccentric precession speed-rotating device 1 will cause low-amplitude and fixed-frequency up-and-down vibrations. Its low amplitude will not cause significant dynamic effects on the rotating bridge 2, but its vibration effect will be transmitted along the long cantilever of the rotating bridge 2. Using the "lever effect", the vibration effect is amplified at the rotating ball joint 3, and a certain amplitude of up-and-down excitation can be induced at the rotating ball joint 3 by using the low-mass eccentric precession speed-rotating device 1, greatly activating the friction property at the rotating ball joint 3, reducing the difference between the static and dynamic friction coefficients, and improving the rotation smoothness. When the rotating bridge 2 starts to rotate, the eccentric precession speed-rotating device 1 still maintains high-speed self-rotation and provides an excitation effect. During the rotation process, the support point of the rotating rod 107 at the lifting leg 103 is lowered by using the lifter 108, causing the precession effect of the rotor 101 rotating at high speed. The precession torque is a horizontal rotation, which can assist in providing the rotational torque for the rotating bridge 2, enriching the power source for rotation, partially sharing the power output of the traction device 4, and improving the rotation smoothness.

[0032] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit of the present invention and the scope protected by the claims. All of these are within the protection scope of the present invention.

Claims

1. A device for improving the smoothness of bridge rotation based on the eccentric precession effect of a vibrating rotor, characterized in that, It includes a slewing bridge and eccentric precession speed rotation devices. Two of the eccentric precession speed rotation devices are respectively fixedly arranged at both ends of the slewing bridge. A bridge support frame is arranged at the lower end of the slewing bridge, and the bottom end of the bridge support frame is fixedly arranged on a rotating ball hinge, and the rotating ball hinge is fixedly arranged on a ground plate. Two traction devices are symmetrically arranged obliquely on the ground plate.

2. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration rotor according to claim 1, characterized in that The eccentric precession speed rotation device includes a rotor, a central bearing and a rotating rod. The rotor and the central bearing are connected by a strip. The central bearing is sleeved on the rotating rod. Both ends of the rotating rod are arranged on the lifting legs. An elevator for actively adjusting the horizontal height of the rotating rod is arranged inside the lifting legs. A fixed leg is arranged at the lower end of the lifting legs, and the fixed leg is fixedly arranged on a bottom plate. Eccentric blocks are symmetrically and fixedly arranged at the outer edge of the rotor. A starting device is arranged outside the rotor, and the starting device is electrically connected to a motor.

3. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration rotor according to claim 2, characterized in that The starting device is in close contact with or separated from the rotor as the case may be, and the starting device can actively apply a rotational torque to the rotor to drive the rotor to rotate.

4. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration rotor according to claim 3, characterized in that Rubber thin layers for increasing the contact friction coefficient are arranged on the contact surfaces between the starting device and the rotor. The rotor can control the rotational speed at 150 - 300 revolutions per minute according to the rotation requirements of the slewing bridge.

5. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration rotor according to claim 2, characterized in that The rotor is of an annular structure, with an outer diameter of 80 - 100 cm and a width of 15 - 25 cm.

6. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the rapping rotor according to claim 2, characterized in that The total self - weight of the rotor and the eccentric blocks is 1 - 5 tons.

7. The device for improving the smoothness of the bridge rotation based on the eccentric precession effect of the vibration hammer rotor according to claim 2, wherein, The length of the rotating rod is 100 - 200 cm, and the diameter is 10 - 20 cm.

8. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration rotor according to claim 2, wherein, The bottom plate is bolt - connected to the slewing bridge.

9. The device for improving the smoothness of bridge rotation based on the eccentric precession effect of the vibration hammer rotor according to claim 1, characterized in that The main body of the eccentric precession speed rotation device is made of Q235 steel.

Images