Ball screw type position limiting device

Abstract

The application provides a ball screw type limiting device. The device comprises an outer sleeve, a ball screw arranged in the outer sleeve, a limiting energy consumption component arranged between the ball screw and the outer sleeve, the limiting energy consumption component comprises a limiting sleeve matched with the inner telescopic end of the ball screw, and two groups of first energy consumption units arranged at the two ends of the limiting sleeve, the first energy consumption unit comprises a rotating friction sleeve with a friction rotor, a friction block abutting against the friction rotor to generate friction when the rotating friction sleeve rotates, and a force spring for pressing the friction block against the friction rotor to generate friction energy consumption, the rotating friction sleeve is fixedly connected with the nut of the axially limited ball screw; the force spring is connected between the limiting sleeve and the friction block. The application has the advantages of limiting and excellent damping energy consumption functions, compact structure and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bridge limiting, in particular to a ball screw type limiting device. BACKGROUND

[0002] The existing bridge structure limiting device mainly includes rigid limiting block and elastic limiting component (such as rubber spring, disc spring, steel wire rope and other elastic members). Among them, the rigid limiting block has simple structure, but when the rigid limiting block is used for limiting, a large collision force will be generated, the force is uncontrollable, which leads to structure damage, poor structure reliability and safety, and is not suitable for longitudinal limiting of large stroke and large span bridge. The elastic limiting component provides elastic limiting force for the bridge, but it has the following problems: (1) the elastic limiting component only converts the kinetic energy of the bridge movement into elastic potential energy and releases it, so the greater the displacement of the bridge, the greater the spring restoring force, and the greater the elastic potential energy released by the elastic limiting component, which does not have the function of energy absorption and energy dissipation; (2) the maximum bearing capacity of disc spring and rubber spring is small, and when the bridge needs to be limited in large stroke, the length of disc spring and rubber spring needs to be set very long, so it cannot be applied to bridge limiting in large stroke. It can be seen that the existing structure limiting device does not have or has poor energy dissipation capacity, and cannot realize the large stroke limiting of the bridge.

[0003] The existing bridge friction damper is usually a constant force friction damper, so the friction force of the bridge is also large when the displacement is small, which is easy to cause component fatigue damage; at the same time, the existing bridge friction damper does not have limiting function, which cannot be applied to effective limiting of structure in different displacement, so the safety and reliability of the structure are poor. SUMMARY

[0004] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art, and to provide a ball screw type limiting device which has the functions of limiting and excellent vibration reduction and energy dissipation, and has compact structure.

[0005] To solve the above technical problems, the technical solution provided by the present application is as follows:

[0006] A ball screw type limiting device, comprising an outer sleeve, a ball screw arranged in the outer sleeve, and a limiting energy dissipation assembly arranged between the ball screw and the outer sleeve, the limiting energy dissipation assembly comprising a limiting sleeve limiting matched with the inner telescopic end of the ball screw, and two groups of first energy dissipation units arranged at the two ends of the limiting sleeve, respectively, the first energy dissipation unit comprising a rotating friction sleeve with a friction rotor, a friction block frictionally abutting against the friction rotor when the rotating friction sleeve rotates, and a force spring pressing the friction block against the friction rotor when the friction block dissipates energy, the rotating friction sleeve being fixedly connected with the nut of the axially limited ball screw; the force spring being connected between the limiting sleeve and the friction block.

[0007] As a further improvement of the above technical solution:

[0008] The inner side of the screw rod of the ball screw is provided with a limiting piece, both ends of the limiting sleeve are provided with a limiting platform for limiting cooperation with the limiting piece, and the initial distance between the limiting piece and the limiting platform is greater than or equal to the sum of the maximum compression amount of the force spring and the preset maximum displacement of the structure to be damped.

[0009] The force spring is in an unprepressed state at the initial position, when the actual axial displacement of the ball screw is less than the initial distance between the limiting piece and the limiting platform, the force spring is not compressed, and the limiting force generated by the limiting energy consumption component is zero; when the actual axial displacement of the ball screw is greater than the initial distance between the limiting piece and the limiting platform, the limiting piece and the limiting platform are limited to cooperate, and the limiting force generated by the limiting energy consumption component is proportional to the actual axial displacement of the ball screw.

[0010] The limiting force generated by the limiting energy consumption component and the actual axial displacement of the ball screw satisfy the following relationship:

[0011]

[0012]

[0013]

[0014]

[0015] Wherein, is the limiting force generated by the limiting energy consumption component, is the initial distance between the limiting piece and the limiting platform, is the actual axial displacement of the ball screw, is the speed direction of the ball screw, is the ratio of the axial force converted by the ball screw to the axial pressure of the friction rotor, is the stiffness of the force spring, is the axial force converted by the ball screw, is the axial pressure of the friction rotor, is the friction coefficient of the friction rotor, is the number of friction surfaces of the friction rotor, is the lead of the ball screw, is the outer diameter of the friction rotor, is the inner diameter of the friction rotor.

[0016] One end of the limiting sleeve is installed between the outer sleeve and the friction block in a way that it is circumferentially limited by the limiting key and axially moves, and the other end of the limiting sleeve is installed between the corresponding friction block in a way that it is circumferentially limited by the limiting key and axially moves.

[0017] One end of the force spring abuts or is fixedly connected to the friction block, and the other end of the force spring abuts against the limiting table, and when one of the force springs is compressed, the end of the other force spring is separated from the friction block or the limiting table.

[0018] The energy dissipation assembly further comprises a second energy dissipation unit, the second energy dissipation unit comprises oppositely arranged conductor plates and energy dissipation permanent magnets, the energy dissipation permanent magnets are arranged in an array, and one of the conductor plates and the energy dissipation permanent magnets is arranged on the rotating friction sleeve, and the other is arranged on the outer sleeve.

[0019] The nut of the ball screw is axially limited in the outer sleeve through the first thrust bearing, and the rotating friction sleeve is installed in the outer sleeve through the second thrust bearing.

[0020] Compared with the prior art, the advantages of the present application are that:

[0021] The friction energy dissipation of the present application has two energy dissipation paths, one of which is that the rotating friction sleeve provided with a friction rotor is fixedly connected to the nut axially limited by the ball screw, and when the screw rod of the ball screw axially moves, the nut does not move axially and rotates circumferentially, thereby driving the friction rotor of the rotating friction sleeve to rotate, the friction block abuts and contacts the friction rotor through the force spring, so that the friction rotor and the friction block generate relative friction, thereby realizing friction energy dissipation.

[0022] The other energy dissipation path is that the screw rod of the ball screw axially moves, and two groups of first energy dissipation units are arranged at both ends of the limiting sleeve, that is, the first energy dissipation unit is arranged with the limiting sleeve, the friction block and the force spring, the limiting sleeve can be limited with the telescopic end of the ball screw to realize the limiting function of the structure; the force spring is connected between the limiting sleeve and the friction block to provide the friction block with the force to press the friction rotor when the limiting sleeve is limited and axially moves, which makes the force of the bridge structure axially vibrate sequentially act on the friction rotor through the screw rod of the ball screw, the limiting sleeve, the force spring and the friction block, so that the pressure of the friction rotor increases and the friction rotor rotates, which generates a friction torque that increases with displacement, and the friction torque is fed back to the screw rod through the nut, thereby generating an axial damping force that increases with displacement, that is, the axial force converted by the ball screw is much larger than the elastic force of the force spring, thereby further limiting the axial movement of the bridge structure connected with the screw rod and realizing better vibration damping and energy dissipation effect.

[0023] It can be seen that the ball screw limiting device has the advantages that the structural motion characteristics of the ball screw are utilized, and the bridge structure is provided with limiting force through friction and energy consumption through friction torque, the problem that the existing limiting device and damper cannot simultaneously have the functions of limiting and energy consumption is avoided, the effect of vibration reduction and energy consumption is greatly improved, and the reliable and safe operation of the structure is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0024] Hereinafter, the present application will be described in more detail based on the embodiments and with reference to the accompanying drawings. In which:

[0025] Figure 1 is a structural schematic view of the ball screw limiting device of the present application;

[0026] Figure 2 is a structural schematic view of the ball screw limiting device of the present application in specific application;

[0027] Figure 3 is a relationship curve between the actual axial displacement of the ball screw limiting member of the present application and the limiting force generated by the limiting energy consumption assembly.

[0028] The various reference signs in the drawings represent:

[0029] 1, outer sleeve; 2, ball screw; 21, nut; 22, screw rod; 23, limiting member; 3, limiting energy consumption assembly; 31, first energy consumption unit; 311, limiting sleeve; 3111, limiting platform; 312, rotating friction sleeve; 3121, friction rotor; 313, friction block; 314, force spring; 32, second energy consumption unit; 321, conductor plate; 322, energy consumption permanent magnet; 4, first thrust bearing; 5, second thrust bearing; 6, bridge; 61, beam body support; 7, bridge tower platform; 71, platform support. DETAILED DESCRIPTION

[0030] The present application will be further described in detail below in combination with the drawings and specific embodiments, but the protection scope of the present application is not limited by this.

[0031] Figure 1 and Figure 2The embodiment of the ball screw type limiting device of the application is shown, which can be applied to the limiting and damping of structures such as bridges 6. The limiting device of the application is arranged at the bottom or both sides of the bridge 6. One end of the limiting device is connected to the bridge 6 through the beam body support 61. The other end of the limiting device is connected to the bridge tower platform 7 through the platform support 71. In this embodiment, the ball screw type limiting device comprises an outer sleeve 1, a ball screw 2 and a limiting energy dissipation assembly 3. The ball screw 2 is arranged in the outer sleeve 1. The limiting energy dissipation assembly 3 is arranged between the ball screw 2 and the outer sleeve 1. The limiting energy dissipation assembly 3 comprises a limiting sleeve 311 and two groups of first energy dissipation units 31. The limiting sleeve 311 is fixedly installed on the outer sleeve 1. When the structure vibrates, the limiting sleeve 311 is limited and matched with the inner side telescopic end of the ball screw 2 when the screw rod 22 of the ball screw 2 moves to a certain distance, and the inner side telescopic end of the ball screw 2 is the telescopic end located in the outer sleeve 1. The two groups of first energy dissipation units 31 are arranged at the two end portions of the limiting sleeve 311 respectively, and are used for limiting the structure vibration.

[0032] In this embodiment, the first energy dissipation unit 31 comprises a rotating friction sleeve 312, a friction block 313 and a force spring 314. The rotating friction sleeve 312 is fixedly connected with the nut 21 of the axially limited ball screw 2. The rotating friction sleeve 312 is provided with a friction rotor 3121. The friction rotor 3121 rotates synchronously with the rotating friction sleeve 312 when the nut 21 rotates in the circumferential direction. The friction rotor 3121 can provide a friction torque when the structure vibrates. The friction torque is converted into an equivalent axial force through the ball screw 2. The friction torque is amplified when it is converted into an axial force through the ball screw 2, so as to realize the axial damping force which changes with the vibration displacement. The friction block 313 is tightly contacted and rubbed with the friction rotor 3121 when the rotating friction sleeve 312 rotates. The force spring 314 is connected between the limiting sleeve 311 and the friction block 313. The force spring 314 is compressed when the friction block 313 rubs and dissipates energy, so as to press the friction rotor 3121 and increase the pressure of the friction rotor 3121.

[0033] The friction energy dissipation of the application has two energy dissipation paths. One energy dissipation path is that the rotating friction sleeve 312 provided with the friction rotor 3121 is fixedly connected with the axially limited nut 21 of the ball screw 2. When the screw rod 22 of the ball screw 2 axially moves, the nut 21 does not move axially and rotates in the circumferential direction, so as to drive the friction rotor 3121 of the rotating friction sleeve 312 to rotate. The friction block 313 is tightly contacted and rubbed with the friction rotor 3121 through the force spring 314, so that the friction rotor 3121 and the friction block 313 generate relative friction, thereby realizing the friction energy dissipation.

[0034] Another energy consumption path is: the axial movement of the screw rod 22 of the ball screw 2, two groups of first energy consumption units 31 are arranged at both ends of the limiting sleeve 311 respectively, that is, the first energy consumption unit 31 is provided with the limiting sleeve 311, the friction block 313 and the force spring 314, the limiting sleeve 311 can be limited and matched with the telescopic end of the ball screw 2 to realize the limiting function of the structure; the force spring 314 is connected between the limiting sleeve 311 and the friction block 313 to provide the friction block 313 with the force to press the friction rotor 3121 when the limiting sleeve 311 is limited and moves axially, which makes the force of the bridge 6 and the like structure when the bridge 6 and the like structure vibrates axially can act on the friction rotor 3121 through the screw rod 22 of the ball screw 2, the limiting sleeve 311, the force spring 314 and the friction block 313 in turn, so that the pressure of the friction rotor 3121 increases, and the friction rotor 3121 rotates, which generates a friction torque that increases with displacement, and the friction torque is fed back to the screw rod 22 through the nut 21, thereby generating an axial damping force that increases with displacement, that is, the axial force of the friction torque amplified and converted by the ball screw 2 is much larger than the elastic force of the force spring 314 itself, thereby further limiting the axial movement of the bridge 6 and the like structure connected with the screw rod 22, and achieving better vibration damping and energy consumption effect.

[0035] It can be seen that the present application utilizes the structural movement characteristics of the ball screw 2 and realizes that the bridge 6 and the like structure can provide limiting force through friction and energy consumption through friction torque through ingenious structural design, avoids the problem that the existing limiting device and damper cannot simultaneously have limiting and energy consumption functions, and greatly improves the vibration damping and energy consumption effect, thereby ensuring the reliable and safe operation of the structure.

[0036] The present application transmits the force of the structure to the friction rotor 3121 and the friction block 313 through the force spring 314, and finally converts the elastic force of the force spring 314 into friction force, compared with the existing elastic components that can absorb energy, avoids the problem that the elastic components release energy after converting kinetic energy into elastic potential energy, the present application enables the limiting function to be realized through the elastic component, and energy is not released when the elastic component resets, but is absorbed and consumed in the form of friction force, the present application has the effect of vibration damping and energy consumption compared with the existing elastic components.

[0037] Compared with the traditional friction damper, the displacement-related characteristic is realized, a displacement-related friction force is realized, that is, when the displacement of the bridge 6 and the like structure is small, the pressure of the friction rotor 3121 under the action of the force spring 314 and the friction block 313 is also small, and the friction torque of the friction rotor 3121 is small; when the displacement of the structure is large, the friction torque is also increased, thereby avoiding the problems that the friction damping force of the traditional friction damper is constant and the components are prone to damage, and the friction force of the present application can be adjusted according to the size of the displacement of the structure, so that the friction energy consumption is reduced and the components are prevented from being damaged when the displacement of the bridge 6 and the like structure is small, and the friction energy consumption is increased and the energy consumption effect is ensured when the displacement of the structure is large.

[0038] Compared with the traditional friction damper, the damping energy consumption function and the adjustable friction damping function are realized, and the effective limiting of the external components (such as the bridge 6) at different displacements is realized, so that the effective vibration reduction and safe and reliable operation of the structure are better ensured.

[0039] The present application utilizes the amplification effect of the ball screw 2 to amplify the small torque of the nut 21 into large-tonnage output force in the axial direction; at the same time, the present application does not need to rely on material deformation when limiting the large stroke of the bridge 6 and the like structure, and the space occupied is greatly reduced compared with the way of relying on material deformation of the elastic limiting component, and the layout is compact, so that the present application can be effectively applied to the vibration reduction and limiting of large-tonnage and large-stroke structures. For example, the compressibility of the traditional disc spring or rubber spring is assumed to be 40%, if a stroke of ±1m needs to be realized, the original length of the spring on one side needs to be 5m, and the length of the two springs and the piston rod after pre-pressing assembly will be more than 4x2+1=9m, while the output force of the present application does not rely on the deformation of the material, and the total length of the device when realizing the same stroke of ±1m only needs to be 3x1m+construction length (4~4.5m).

[0040] Further, the screw rod 22 of the ball screw 2 is provided with a limiting piece 23 at the telescopic end, and the limiting sleeve 311 is provided with a limiting block 3111 at both ends, the limiting block 3111 can be limited and matched with the limiting piece 23 when the screw rod 22 moves in the axial direction, and the initial distance between the limiting piece 23 and the limiting block 3111 is greater than or equal to the sum of the maximum compression amount of the force spring 314 and the preset maximum displacement of the structure to be damped, so that the limiting device of the present application has excellent damping effect before the structure reaches the maximum displacement, and the force spring 314 does not produce pressure loss within the preset maximum displacement, further ensuring the safety and stability of the structure.

[0041] In the embodiment, the limiting piece 23 is a limiting end plate, and the limiting end plate is arranged at the telescopic end surface of the screw rod 22. In other embodiments, the structure of the limiting piece 23 can be a limiting sleeve 311 arranged at the telescopic end of the screw rod 22 as long as the limiting can be realized.

[0042] Further, the force applying spring 314 is in an unprecompressed state when in the initial position, when the bridge 6 is in the normal displacement state, the actual axial displacement of the ball screw 2 is smaller than the initial distance between the limiting piece 23 and the limiting table 3111, the force applying spring 314 is not compressed, and the limiting force generated by the limiting energy dissipation assembly 3 is zero, at this time, the limiting energy dissipation assembly 3 does not work. When the actual axial displacement of the ball screw 2 is greater than the initial distance between the limiting piece 23 and the limiting table 3111, it indicates that the bridge 6 displacement is out of limit, at this time, the limiting piece 23 and the limiting table 3111 limit cooperation, the limiting energy dissipation assembly 3 generates a limiting force proportional to the actual axial displacement of the ball screw 2, thereby adjusting the damping force with the amplitude of the bridge 6, ensuring that the limiting device can reliably move in different states of the bridge 6, and ensuring the vibration reduction effect of the bridge 6.

[0043] Further, the limiting force generated by the limiting energy dissipation assembly 3 and the actual axial displacement of the ball screw 2 satisfy the following relationship:

[0044] (1)

[0045] (2)

[0046] (3)

[0047] (4)

[0048] Wherein, is the limiting force generated by the limiting energy dissipation assembly 3, is the initial distance between the limiting piece 23 and the limiting table 3111, is the actual axial displacement of the ball screw 2, and the initial position of the limiting piece 23 of the ball screw 2 is set as 0, is used to distinguish the displacement direction when the limiting device is pulled and pressed, is the speed direction of the ball screw 2, is the ratio of the axial force converted by the ball screw 2 to the axial pressure on the friction rotor 3121, is the stiffness of the force applying spring 314, is the axial force converted by the ball screw 2, is the axial pressure on the friction rotor 3121, the axial pressure on the friction rotor 3121 is the pressure increased by the compression amount of the force applying spring 314 caused by the common displacement of the limiting sleeve 311 and the limiting piece 23, is the friction coefficient of the friction rotor 3121, is the number of friction surfaces of the friction rotor 3121, is the lead of the ball screw 2, is the outer diameter of the friction rotor 3121, is the inner diameter of the friction rotor 3121.

[0049] From the above formulas (1) to (4), it can be seen that the device of the present invention is At this time, the limiting force generated by the limiting energy dissipation component 3 is directly related to the initial distance between the limiting member 23 and the limiting platform 3111, the stiffness of the force spring 314, the axial force converted by the ball screw 2, and the axial pressure on the friction rotor 3121. By adjusting the above parameters, the limiting force generated by the limiting energy dissipation component 3 can be flexibly and accurately adjusted, thereby further realizing effective energy dissipation and vibration reduction of the structure, and its operation is convenient and the adjustment reliability is high. At the same time, the direction of the limiting force generated by the limiting device and the speed direction of the ball screw 2 are directly related to the initial distance between the limiting member 23 and the limiting platform 3111, the stiffness of the force spring 314, the axial force converted by the ball screw 2, and the axial pressure on the friction rotor 3121. By adjusting the above parameters, the limiting force generated by the limiting energy dissipation component 3 can be flexibly and accurately adjusted, thereby further realizing effective energy dissipation and vibration reduction of the structure, and its operation is convenient and the adjustment reliability is high. Related, such as Figure 1 As shown, when the left end is fixed, the speed direction of the ball screw 2 When the ball screw 2 moves to the left, the limiting device is under pressure. At this time, the limiting force generated by the limiting device is directed to the right. When it moves to the right, the limit device is under tension. At this time, the direction of the limit force generated by the limit device is to the left.

[0050] Furthermore, if Figure 1 As shown, one end of the limiting sleeve 311 is disposed between the outer sleeve 1 and the friction block 313, circumferentially limited by a limiting key and axially movable. The other end of the limiting sleeve 311 is circumferentially limited by a limiting key and axially movable on the corresponding friction block 313. Thus, while limiting the relative rotation between the friction block 313 and the limiting sleeve 311, the friction block 313 has axial freedom, and the limiting sleeve 311 can be relatively displaced, effectively compressing the force spring 314, ensuring reliable transmission of friction force and friction torque.

[0051] Furthermore, one end of the force spring 314 abuts or is fixedly connected to the friction block, and the other end of the force spring 314 abuts against the limit platform 3111. When one of the force springs 314 is compressed, the end of the other force spring 314 disengages from the friction block or the limit platform 3111, so that the disengaged force spring 314 is not subjected to force, ensuring that the limit device can operate effectively under tension and compression, and has a compact structure and occupies little space.

[0052] Preferably, the energy dissipation assembly further includes a second energy dissipation unit 32, which includes a conductor plate 321 and energy dissipation permanent magnets 322 arranged opposite each other. The energy dissipation permanent magnets 322 are arranged in an array, with the energy dissipation permanent magnets 322 disposed on the rotating friction sleeve 312 and the conductor plate 321 disposed on the outer sleeve 1. This compact layout and small footprint allow for integration with the first energy dissipation unit 31. This significantly enhances the vibration reduction effect of the position limiting device without increasing the space required for the position limiting device.

[0053] When the structure vibrates, the vibration is transmitted to the ball screw 2, at this time, the nut 21 of the ball screw 2 drives the rotating friction sleeve 312 to rotate, at this time, the energy consumption permanent magnet 322 located in the rotating friction sleeve 312 rotates relative to the conductor plate 321, thereby cutting the magnetic induction lines and generating an electric eddy current in the conductor plate 321, the electric eddy current generates an electromagnetic field opposite to the polarity of the magnetic field of the energy consumption permanent magnet 322 itself, the two electromagnetic fields with opposite polarities hinder each other's movement, thereby generating an electric eddy current damping effect, so that the structure vibration is converted into thermal energy of the electric eddy current heating, and the thermal energy is consumed through air conduction and the like, thereby further ensuring the structure energy consumption and vibration reduction. And its structure is simple and layout is compact. In other embodiments, the conductor plate 321 and the energy consumption permanent magnet 322 can be installed interchangeably, that is, the conductor plate 321 can also be arranged in the rotating friction sleeve 312, and the energy consumption permanent magnet 322 can also be arranged in the outer sleeve 1. It can be seen that the combination of the first energy consumption unit 31 and the second energy consumption unit 32 of the present application better realizes the vibration control of the structure and better ensures the safe and reliable operation of the structure. At the same time, the first energy consumption unit 31 of the present application adopts the structure of friction energy consumption and increasing friction torque, and the second energy consumption unit 32 adopts the structure of electric eddy current non-friction vibration reduction for vibration reduction, which changes the vibration reduction structure and method of the existing limiting device, avoids the occurrence of phenomena such as contact wear and liquid leakage of the existing limiting device, ensures the vibration reduction effect, and greatly improves the durability of the limiting device.

[0054] In the embodiment, the conductor plate 321 is made of a high-conductivity non-ferromagnetic material (such as copper, aluminum, copper alloy or aluminum alloy, etc.), so as to improve the strength of the electric eddy current in the conductor plate 321. The energy consumption permanent magnet 322 is a plurality of energy consumption permanent magnets 322, which are arranged in an axial and / or radial direction along the rotating friction sleeve 312, and the energy consumption permanent magnet 322 is coaxially arranged with the rotating friction sleeve 312. The energy consumption permanent magnet 322 adopts a Halbach array, an axial magnetization and / or a radial magnetization magnetic group. The thickness, length and total length of the radial and axial magnetic poles of the energy consumption permanent magnet 322 can be adjusted according to the selected magnetic pole array and the required braking force.

[0055] In the embodiment, the nut 21 of the ball screw 2 is axially limited in the outer sleeve 1 through the first thrust bearing 4, and the rotating friction sleeve 312 is installed in the outer sleeve 1 through the second thrust bearing 5, so as to ensure the reliable and effective rotation of the ball screw 2 and the rotating friction sleeve 312.

[0056] As shown in Figure 1 and 3 , the present application sets that when the ball screw 2 moves to the right at the initial position, the displacement is positive and the speed direction is positive, and the limiting force generated by the limiting energy consumption assembly 3 is negative; when the ball screw 2 moves to the left at the initial position, the displacement is negative and the speed direction is negative, and the limiting force generated by the limiting energy consumption assembly 3 is positive. Specifically:

[0057] Figure 3 In the coordinates, the fourth quadrant is the situation where the ball screw 2 is pulled when it moves to the right from the initial position (0), that is, the limiter 23 moves from the initial distance Exercise to , The actual axial displacement of ball screw 2 is the preset limit stroke. With preset limit travel satisfy At this time, the movement speed of the ball screw 2 is positive, the limiting force on the external end of the ball screw 2 is negative, and the absolute value of the limiting force gradually increases with the displacement. At this time, the limiting device is in a tensile state and generates an adaptive energy-consuming limiting force with the displacement.

[0058] The second quadrant is the situation where the device is compressed when the ball screw 2 moves leftward from the initial position, that is, the limiter 23 moves from the initial distance Exercise to At this time, the movement speed of the end of the ball screw 2 is negative; the limiting force on the external end of the ball screw 2 is positive, and the limiting force gradually increases with the displacement. At this time, the limiting device is in a compressed state and generates an adaptive energy-consuming limiting force with the displacement.

[0059] The first quadrant is the situation where the ball screw 2 recovers from the rightmost limit position to the initial position, that is, the limit member 23 recovers from the initial position Exercise to At this point, the outer end of ball screw 2 moves at a negative speed, while the limiting force of limiting energy dissipation assembly 3 becomes positive and gradually decreases to zero. This allows the limiting device to return to its initial state as the vibration of the bridge 6 or other structure gradually weakens. This allows the limiting device to reliably and effectively return from a tensioned state to its initial state as the vibration of the bridge 6 or other structure gradually weakens.

[0060] The third quadrant is the situation where the ball screw 2 recovers from the leftmost limit position to the initial position, that is, the limit member 23 is Sports At this time, the outer end of the ball screw 2 moves at a positive speed, the limiting force of the limiting energy dissipation assembly 3 becomes negative, and the absolute value of the limiting force gradually decreases to zero. This allows the limiting device to return to its initial state as the vibration of the bridge 6 or other structure gradually weakens. This allows the limiting device to reliably and effectively return to its initial state from a compressed state as the vibration of the bridge 6 or other structure gradually weakens.

[0061] It can be seen that the limiting force generated by the limiting energy consumption assembly 3 is opposite to the speed of the ball screw 2, and the limiting force generated by the limiting energy consumption assembly 3 is proportional to the absolute value of the actual axial displacement of the ball screw 2, the damper can be adjusted according to the vibration size of the bridge 6 and the like controlled structure, and can be effectively restored to the initial state, and the overall reliability and safety are high.

[0062] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope thereof, and equivalent parts can be substituted therefor. In particular, the technical features mentioned in each of the embodiments can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A ball screw type limiting device, characterized in that: The cam is secured to the rear of the drive gear and is adapted to engage the guide rails of the drive gear when the cam is engaged with the guide rails, and the cams are secured to the rear of the drive gear when the cam is engaged with the guide rails.

2. The ball screw type limiting device according to claim 1, characterized in that: The force spring is in an unprestressed state in the initial position. When the actual axial displacement of the ball screw is less than the initial distance between the limit member and the limit platform, the force spring is not compressed, and the limit force generated by the limit energy dissipation component is zero; when the actual axial displacement of the ball screw is greater than the initial distance between the limit member and the limit platform, the limit member and the limit platform are limitedly matched, and the limit energy dissipation component generates a limit force proportional to the actual axial displacement of the ball screw.

3. The ball screw type limiting device according to claim 2, characterized in that: The limiting force generated by the limiting energy dissipation component and the actual axial displacement of the ball screw satisfy the following relationship: in, The limiting force generated by the limiting energy-consuming component, is the initial distance between the limiter and the limit platform, is the actual axial displacement of the ball screw, is the velocity direction of the ball screw, It is the ratio of the axial force converted by the ball screw to the axial pressure exerted on the friction rotor. is the stiffness of the force spring, is the axial force converted by the ball screw, is the axial pressure on the friction rotor, is the friction coefficient of the friction rotor, is the number of friction surfaces of the friction rotor, is the lead of the ball screw, is the outer diameter of the friction rotor, is the inner diameter of the friction rotor.

4. The ball screw type limiting device according to claim 2 or 3, characterized in that: One end of the limit sleeve is arranged between the outer sleeve and the friction block through circumferential limitation and axial movement by a limit key, and the other side end of the limit sleeve is installed on the corresponding friction block through circumferential limitation and axial movement by a limit key.

5. The ball screw type limiting device according to claim 4, characterized in that: One end of the force spring abuts or is fixedly connected to the friction block, and the other end of the force spring abuts against the limit platform. When one of the force springs is compressed, the end of the other force spring is separated from the friction block or the limit platform.

6. The ball screw type limiting device according to any one of claims 1 to 3, characterized in that: The energy dissipation component also includes a second energy dissipation unit, which includes a conductor plate and an energy dissipation permanent magnet arranged relatively to each other. The energy dissipation permanent magnets are arranged in an array. One of the conductor plate and the energy dissipation permanent magnet is provided on the rotating friction sleeve, and the other is provided on the outer sleeve.

7. The ball screw type limiting device according to any one of claims 1 to 3, characterized in that: The nut of the ball screw is axially limited in the outer sleeve by a first thrust bearing, and the rotating friction sleeve is installed in the outer sleeve by a second thrust bearing.

Images