One-way force output inerter

Abstract

The invention relates to a one-way force output inerter, which belongs to the field of vibration reduction and isolation of civil engineering structures, and comprises a supporting rod, a two-way reciprocating screw rod pair, a force arm, a steel rope fixing point, a bracket, a steel rope, a lower cross beam, a mass block and a base. The force arm, the support and the lower cross beam form a frame which serves as an upper output end of force and is connected with a main structure to be subjected to vibration reduction and isolation. The bottom of the supporting rod serves as a lower force output end and is connected with the base or the foundation; the steel rope converts axial movement of the two end points into rotation movement of the supporting rod and the mass block, and one-way pressure or tension output is achieved. The structure has the advantages of being simple in structure, reliable in work, flexible in adjustment, high in adaptability and the like, and can be widely applied to the fields of bridges, high-rise buildings, earthquake isolation systems, large machines and the like, and the vibration reduction and isolation effect and the safety performance of the structure are improved.

Description

Technical Field

[0001] The present invention belongs to the field of vibration reduction and isolation of civil engineering structures, and in particular relates to a unidirectional output inertia container. Background Art

[0002] A unidirectional force element can be understood as a force element that only generates force in a certain direction during the forward and reverse reciprocating motion of the structure. As a mass or inertial element of a basic mechanical element, there are few unidirectional mass or inertial elements reported so far. An ordinary inertial capacitor is a typical inertial mechanical element, including a variety of implementation methods, such as typical ball screw inertial capacitors, gear rack inertial capacitors, and other inertial capacitors that provide inertial effects based on flywheel rotation, as well as other types of inertial capacitors. The force at the two ends of an ordinary inertial capacitor is proportional to the relative acceleration of the two ends. The direction of the force has both positive and negative directions within one working cycle. It is a bidirectional output inertial mechanical element. For an inertial capacitor that provides inertial effects based on flywheel rotation, from an energy perspective, in the first half of the cycle, the dynamic potential energy of the vibration of the structure is converted into the dynamic potential energy of the flywheel rotation, and in the second half of the cycle, the dynamic potential energy of the flywheel rotation is converted into the dynamic potential energy of the structure. If damping is not considered or the damping is weak, the energy is transferred back and forth between the structure and the flywheel without dissipation. This mechanism limits the vibration reduction effect of the inertial capacitor. On the basis of common inertia vessels, articles such as "Experimental and numerical assessment of the seismic response of steel structures with clutched inerters" and "Seismic Protection of Structures with Supplemental Rotational Inertia" reported a one-way inertia vessel that uses a ratchet clutch mechanism combined with a ball screw mechanism to achieve one-way rotation of the flywheel and one-way output at both ends, which is called "clutch inerter" in the original article. In a vibration cycle of the structure, when the structure moves forward, the one-way inertia vessel based on the ratchet clutch mechanism drives the flywheel to rotate in a certain direction, and inertia forces are generated at both ends. When the structure moves in the reverse direction, due to the existence of the ratchet clutch, no reverse driving force is generated on the flywheel, and the flywheel continues to rotate in the original direction, and no inertia forces are generated at both ends. These documents prove that the one-way inertia vessel based on the ratchet clutch mechanism helps to achieve better vibration reduction effects on building structures or other engineering structures.

[0003] However, there are relatively few ways to implement a one-way inertia container. The reported one-way inertia container based on a ratchet clutch mechanism still has some shortcomings. For example, the mechanical clearance of the gears of the ratchet clutch will cause a collision force in the one-way inertia container, and the ratchet clutch is prone to wear.

[0004] Based on the above background, a new type of unidirectional output inertia container based on the unidirectional tension characteristic of the rope is proposed, which provides a new technical solution for vibration reduction and isolation engineering. It can meet the requirement of transmitting the vibration energy from the main structure to the inertia body of the unidirectional inertia container in one vibration cycle of the structure, and then dissipate it in combination with the damping mechanism, and avoid mechanical clearance and mechanical wear. It has the advantages of simple structure, low cost, reliability and durability. Summary of the invention

[0005] The purpose of the present invention is to provide a unidirectional output inertia container based on the unidirectional tension characteristic of the rope, so as to provide a new technical solution for vibration reduction and isolation engineering.

[0006] The purpose of this disclosure can be achieved through the following technical solutions:

[0007] A one-way output inertia container, the inertia container comprising:

[0008] The support rod is located in the center of the device and is responsible for connecting other components. The upper section of the support rod is provided with a bidirectional reciprocating screw rod pair;

[0009] A bidirectional reciprocating screw pair, including a bidirectional reciprocating screw, is used to convert the direction of force;

[0010] The mass block is connected to the lower end of the support rod and participates in the rotational motion;

[0011] A steel rope fixing point is arranged on the support rod for fixing the steel rope;

[0012] The frame, connected to the support rods, bears the pressure;

[0013] Steel rope: connects the steel rope fixing point and the frame, transmits and converts force;

[0014] Mass block: connected to the lower end of the supporting rod and participates in the rotational motion.

[0015] Furthermore, the frame includes a force arm, a bracket and a lower cross beam. A circular hole is opened in the center of the force arm and the lower cross beam. The hole diameter is larger than the diameter of the support rod. The support rod passes through the force arm and the lower cross beam and rotates in the circular hole. The shape of the force arm and the lower cross beam is a symmetrical shape such as a beam or a disc. The two ends of the bracket are fixedly connected to the force arm and the lower cross beam respectively.

[0016] Furthermore, the bidirectional reciprocating screw has positive and negative rotation threads with equal pitches, opposite directions and intertwined with each other. The positive and negative rotation threads are disconnected at the upper part of the screw to form a turning area, and are connected at the lower part of the screw to form a thread changing area.

[0017] Furthermore, a screw cap is provided at the upper end of the bidirectional reciprocating screw rod, which is cylindrical and has no threads. Its upper part is welded in the middle of the force arm, and a hole is opened inside it, the hole diameter is consistent with the hole diameter of the force arm, and a small hole is opened on its side and a pin is placed;

[0018] The pin head is embedded in the screw cap and can rotate, and the tail is in sheet shape, and the thickness of the pin is smaller than the thread width.

[0019] Furthermore, the shape of the mass block is symmetrical about the center of the support rod.

[0020] Furthermore, the number of the steel ropes is two or more, and the steel ropes are symmetrically distributed around the center of the support rod.

[0021] Furthermore, when installing the steel ropes, one ends of the multiple steel ropes are fixed together to the steel rope fixing points on the supporting shaft, and are rotated and wound around the supporting rod in the same direction, tightened, and after the rope ends are led out, they are fixed to the steel rope fixing points on the lower beam respectively.

[0022] Furthermore, the base includes a base shell, a base ball and a base inner disc. The base shell includes an inner stopper of the base shell, a rolling groove and an outer stopper of the base shell. The upper and lower surfaces of the base inner disc have rolling grooves, which form a cavity with the rolling grooves, and the base ball rolls in it.

[0023] Furthermore, the frame is slidably mounted on the main structure, and the frame moves up and down as the main structure vibrates.

[0024] Furthermore, the lower portion of the support rod is fixedly connected to the base inner disk of the base, the support rod rotates around the axis together with the mass block, and the support rod and the mass block are axially fixed.

[0025] Beneficial effects of the present disclosure:

[0026] The present invention designs a unidirectional output inertia container for structural vibration reduction according to the unidirectional tension characteristics of the rope. The main structure vibrates in both positive and negative directions and drives the mass block to rotate unidirectionally in a certain direction, thereby realizing unidirectional inertia capacity output. The vibration mechanical energy of the main structure is unidirectionally transmitted and converted into the vibration mechanical energy of the mass block, thereby exerting a dynamic vibration absorption effect and effectively reducing the vibration response of the main structure.

[0027] Compared with the one-way inertia container based on the ratchet clutch mechanism, the present invention avoids mechanical clearance and mechanical wear, has the advantages of simple structure, low cost, reliability and durability;

[0028] The present invention utilizes the synergistic effect of the steel rope and the bidirectional reciprocating screw pair to realize a "translation-rotation conversion mechanism" to convert the axial motion of the two end points into the rotational motion of the support rod and the mass block, thereby simplifying the design of the structure and reducing the weight and cost of the structure.

[0029] The present invention adopts the design of the base ball, so that the support rod and the mass block can rotate around the axis at high speed in both positive and negative directions without transmitting horizontal torque, thus ensuring the installation and stability of the structure;

[0030] The present invention has the advantages of simple structure, reliable operation, flexible adjustment, strong adaptability, etc. It can be widely used in bridges, high-rise buildings, earthquake isolation systems, large machinery and other fields to improve the vibration reduction and isolation effect and safety performance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present disclosure;

[0033] Figure 2 It is a partial structural schematic diagram of a bidirectional reciprocating screw rod pair according to an embodiment of the present disclosure;

[0034] Figure 3 It is a partial force diagram of a bidirectional reciprocating screw rod pair according to an embodiment of the present disclosure;

[0035] Figure 4 is a schematic diagram of a loading curve of an embodiment of the present disclosure;

[0036] Figure 5 is a schematic diagram of the initial state of an embodiment of the present disclosure;

[0037] Figure 6 is a schematic diagram of the preparation stage of the embodiment of the present disclosure;

[0038] Figure 7 This is a schematic diagram of the first working state of the embodiment of the present disclosure;

[0039] Figure 8 is a schematic diagram of the working state II of the embodiment of the present disclosure;

[0040] Fig. 9 is a schematic diagram of the third working state of the embodiment of the present disclosure;

[0041] Fig.10 is a schematic diagram of the movement of the pin in the U-turn area according to the embodiment of the present disclosure;

[0042] Fig.11 is a schematic diagram of the movement of the pin in the wire changing area according to the embodiment of the present disclosure;

[0043] Fig.12 It is a schematic diagram of the partial structure of the base according to the embodiment of the present disclosure;

[0044] Fig.13 It is a schematic diagram of a unidirectional tension inertia capacity structure of an embodiment of the present disclosure; DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0046] Example 1: Figure 1-Figure 12 As shown, a unidirectional force inertia container comprises: a support rod 100, a bidirectional reciprocating screw pair 200, a force arm 300, a steel rope fixing point 400, a bracket 500, a steel rope 600, a lower crossbeam 700, a mass block 800 and a base 1000. A unidirectional force inertia container is a two-terminal force output structure, wherein the upper force output end is a frame formed by consolidating the force arm 300, the bracket 500 and the lower crossbeam 700, and the lower force output end is the bottom of the base 1000. When in use, the upper end is connected to the main structure to be vibration-isolated and moves up and down with the vibration of the main structure, and the lower end is connected to the base 1000 and does not move axially. A unidirectional output inertia container only bears pressure, that is, only outputs pressure to the outside. It can realize a "translation-rotation conversion mechanism" through the coordinated action of a steel rope 600 and a bidirectional reciprocating screw pair 200, and convert the axial motion of the two end points into the rotational motion of a support rod 100 and a mass block 800. It has the property of an inertia container with unidirectional output and can be used for structural vibration reduction and isolation.

[0047] The bidirectional reciprocating screw pair 200 includes: a bidirectional reciprocating screw 210, a screw cap 220, a pin 230, a positive rotation thread 240 and a reverse rotation thread 250. The bidirectional reciprocating screw 210 is located at the upper part of the support rod 100 and is a part of the support rod 100. There are positive rotation threads 240 and reverse rotation threads 250 with equal pitches, opposite directions and intertwined with each other. The angle of the positive rotation thread 240 is +θ, and the angle of the reverse rotation thread is -θ. The positive rotation thread 240 and the reverse rotation thread 250 are disconnected at the upper part of the screw, which is called the turning area 260, and are connected at the lower part of the screw, which is called the wire changing area 270. The screw cap 220 is a cylindrical shape. It has no threads, and its upper part is welded in the middle of the force arm 300. It has a hole inside, and the hole diameter is consistent with the hole diameter of the force arm 300. A small hole is opened on its side and a pin 230 is placed therein. The pin 230 is in the shape of a nail, and its head is embedded in the screw cap 230 and can rotate within the angular range of (-θ, +θ). Its tail is in the shape of a sheet, and its thickness is slightly smaller than the thread width. Its width is suitable to ensure successful wire changing in the wire changing area 270, and its length is suitable to ensure that it can reach the bottom of the thread directly.

[0048] The support rod 100 has a bidirectional reciprocating screw pair 200 on the upper part, and the support rod 100 is fixedly connected to a mass block 800 at the lower part. The mass block 800 can be a disc or any other shape symmetrical about the center of the support rod 100. The lower end of the support rod 100 is fixedly connected to a base 1000.

[0049] The lever arm 300, the bracket 500 and the lower cross beam 700 are consolidated to form a frame structure, which serves as a force input end. A circular hole is opened in the center of the lever arm 300 and the lower cross beam 700, and the hole diameter is slightly larger than the diameter of the support rod 100. The support rod 100 passes through the lever arm 300 and the lower cross beam 700 and rotates in the circular hole. The lever arm 300 and the lower cross beam 700 can be symmetrical shapes such as beams or discs.

[0050] The steel rope 600 is a key force transmission component. It can be made of steel or any other rigid material. The number can be 2 or other even pairs and they must be symmetrically distributed around the center of the support rod 100. In this case, the corresponding lower crossbeam is in a circular ring or disc shape. One end of the two steel ropes 600 are fixed to the steel rope fixing point 400 on the support shaft 100. They rotate in the same direction and are wound around the support rod 100. They are tightened and the rope ends are led out and fixed to the steel rope fixing points 400 on the lower crossbeam 700. During operation, the force arm 300 is under pressure, and the steel rope 600 can withstand tension but not pressure. The horizontal component of the tension in the rope forms a torque on the support rod 100, driving the support rod 100 and the mass block 800 to rotate. The "positive rotation" mentioned above refers to Figure 2 , indicating that its direction of movement or winding is counterclockwise around the axis when viewed from a top-down perspective; the “counter-rotation” is the opposite.

[0051] In a certain embodiment, assuming that the pressure F on the lever arm, the diameter R of the support rod 100, and the angle γ between the steel rope 600 and the horizontal direction, the tension T on the steel rope 600 and the moment M on the support rod 100 are respectively:

[0052] T=F / (2sinγ) (1)

[0053] M=F·R / tanγ (2)

[0054] The base 1000 is as follows Fig.12 As shown, it includes a base shell 1001, a base ball 1002 and a base inner disc 1003; the base shell 1001 includes a base shell inner stopper 10011, a rolling groove 110012 and a base shell outer stopper 10013; the upper and lower surfaces of the base inner disc 1003 are provided with rolling grooves 210031, which form a cavity with the rolling grooves 110012, and the base ball 1002 rolls therein.

[0055] The beneficial effect is that the support rod 100 and the mass block 800 rotate at high speed in both directions around the axis, while the foundation is generally fixed. Through the connection of the base, the support rod 100 is fixedly connected to the inner disk 1003 of the base, and the foundation is fixedly connected to the base shell 1001. In this way, the base 1000 only transmits axial force but not horizontal torque, which can ensure the installation of "a unidirectional output inertial container" in engineering applications.

[0056] The frame part can move up and down with the vibration of the main structure but cannot rotate. The lower part of the support rod 100 is fixedly connected to the base inner disk 1003 of the base 1000, and can rotate around the axis with the mass block 800 but cannot move up and down.

[0057] The working mode of the "one-way output inertia container" can be introduced in an embodiment:

[0058] It is divided into preparation stage and working stage.

[0059] The force F applied by the main structure to the lever arm. In the preparation stage, F = F0, which is a tensile force; in the working stage, F is a sinusoidal pressure. When analyzing a load cycle, its minimum value is F1 and its maximum value is F2. Figure 4 shown.

[0060] At t = 0:

[0061] In the initial state, the steel rope 600 is in a relaxed state. The frame is at the lowest position, and the pin 230 is located at the bottom end of the spiral wire, assuming that it is on the positive spiral wire 240.

[0062] Time period 0 to t1:

[0063] Preparation stage F=F0, which is the tension. The position of the frame is gradually pulled up, and the pin 230 moves up along the positively rotating wire 240 until it reaches the U-turn area 260 at the top of the positively rotating wire 240. During this process, the support rod 100 rotates in reverse and the steel rope 600 is wound around the support rod 100 in the positively rotating direction. Preparation is completed.

[0064] Time period t1 to t2:

[0065] Working state I. F is pressure, increasing from F1 to F2. The position of the frame is gradually lowered, and the pin 230 moves down from the U-turn area 260 at the top of the positive spinning wire 240 to the wire changing area 270 at the bottom of the positive spinning wire 240. In this process, the steel rope 600 is tightened, and the horizontal component of the tension in the rope forms a torque M on the support rod 100, which is counterclockwise and positive, driving the support rod 100 and the mass block 800 to rotate positively, and the wound steel rope 600 is gradually unwound. The angle γ gradually increases, the rope tension T and the torque M gradually decrease, the rotation angular acceleration α gradually decreases, and the rotation angular velocity ω performs an accelerated rotation motion with a gradually decreasing angular acceleration.

[0066] At t2:

[0067] Working state II. F is pressure, F=F2. The frame is at the lowest position, the pin 230 is in the wire changing area at the bottom of the positive spinning wire 240, and the steel rope is tightened, the angle γ is the largest, the rope tension T and the moment of force M are the smallest, the rotation angle α is the smallest, and the rotation angular velocity ω is the largest.

[0068] Time period t2 to t3:

[0069] Working state III. F is the pressure, which decreases from F2 to F1. Due to the inertia of the mass block, the support rod 100 and the mass block 800 continue to rotate in the forward direction at this time, and the untied steel rope 600 is again wound around the support rod 100 in the reverse direction, and the rotation direction is opposite to the direction of the torque M, and the deceleration movement is performed until it stops. In this process, the frame is pulled up, and the pin 230 passively moves upward along the reverse rotation wire 250, the angle γ gradually decreases, the rope tension T and the torque M gradually increase, and the angular acceleration gradually increases. The deceleration rotation movement is performed until it stops at the highest position, preparing for the next cycle of downward pressure.

[0070] During the entire process of sinusoidal pressure action, the working state of a unidirectional output inertia container is a cycle of "Ⅰ-Ⅱ-Ⅲ; Ⅲ-Ⅱ-Ⅰ".

[0071] Embodiment 2: There are many ways to realize a one-way output inertia container by means of a rope. The embodiment discloses one of the one-way pressure inertia containers. Other similar one-way pressure inertia containers can also be realized by changing the structural form.

[0072] like Fig.13 As shown, in some embodiments, the specific implementation method can be a one-way tension inertia container, which differs from the above-mentioned embodiment 1 in that the connection point with the steel rope on the frame is located above the steel rope fixing point on the support rod, and the principle and process are the same as embodiment 1.

[0073] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0074] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A one-way output inertia container, characterized in that: The inert container comprises: The support rod is located in the center of the device and is responsible for connecting other components. The upper section of the support rod is provided with a bidirectional reciprocating screw rod pair; A bidirectional reciprocating screw pair, including a bidirectional reciprocating screw, is used to convert the direction of force; The mass block is connected to the lower end of the support rod and participates in the rotational motion; A steel rope fixing point is arranged on the support rod for fixing the steel rope; The frame, connected to the support rods, bears the pressure; Steel rope: connects the steel rope fixing point and the frame, transmits and converts force; Mass block: connected to the lower end of the supporting rod and participates in the rotational motion.

2. The one-way output inertia container according to claim 1, characterized in that: The frame includes a force arm, a bracket and a lower cross beam. A circular hole is opened in the center of the force arm and the lower cross beam. The hole diameter is larger than the diameter of the supporting rod. The supporting rod passes through the force arm and the lower cross beam and rotates in the circular hole. The shape of the force arm and the lower cross beam is a symmetrical shape such as a beam or a disc. The two ends of the bracket are fixedly connected to the force arm and the lower cross beam respectively.

3. The one-way output inertia container according to claim 2, characterized in that: The bidirectional reciprocating screw has positive and negative rotation threads with equal pitches, opposite directions and intertwined with each other. The positive and negative rotation threads are disconnected at the upper part of the screw to form a turning area, and are connected at the lower part of the screw to form a thread changing area.

4. The one-way output inertia container according to claim 3, characterized in that: The upper end of the bidirectional reciprocating screw rod is provided with a screw rod cap, which is cylindrical and has no threads. The upper part of the screw rod cap is welded in the middle of the force arm, and a hole is opened inside it, the hole diameter is consistent with the hole diameter of the force arm, and a small hole is opened on the side thereof for placing a pin; The pin head is embedded in the screw cap and can rotate, and the tail is in sheet shape, and the thickness of the pin is smaller than the thread width.

5. The one-way output inertia container according to claim 2, characterized in that: The shape of the mass block is symmetrical about the center of the supporting rod.

6. The one-way output inertia container according to claim 1, characterized in that: The number of the steel ropes is an even number of pairs, and the steel ropes are symmetrically distributed around the center of the supporting rod.

7. The one-way output inertia container according to claim 2, characterized in that: When the steel ropes are installed, one end of the multiple steel ropes is fixed to the steel rope fixing point on the supporting shaft, and they are rotated and wound around the supporting rod in the same direction, tightened, and the rope ends are led out and fixed to the steel rope fixing points on the lower beam respectively.

8. The one-way output inertia container according to claim 2, characterized in that: The base includes a base shell, a base ball and a base inner disc. The base shell includes a base shell inner stopper, a rolling groove and a base shell outer stopper. The upper and lower surfaces of the base inner disc are provided with rolling grooves, which form a cavity in which the base ball rolls.

9. The one-way output inertia container according to claim 8, characterized in that: The frame is slidably mounted on the main structure, and moves up and down as the main structure vibrates.

10. The one-way output inertia container according to claim 8, characterized in that: The lower part of the support rod is fixedly connected to the base inner disk of the base, the support rod rotates around the axis together with the mass block, and the support rod and the mass block are axially fixed.

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