Speed ​​lock with automatic unlocking function

Abstract

The present invention is a speed locker with an automatic unlocking function, which overcomes the problem in the prior art that the speed locker needs to be replaced after each earthquake, which greatly increases the maintenance cost after the earthquake. The present invention includes a cylinder body, end covers are arranged at both ends of the cylinder body, a pressure relief end cover is arranged between the end covers, the pressure relief end cover and the cylinder body form a closed locking chamber, a pressure relief valve and a one-way valve are arranged on the pressure relief end cover, the locking chamber is filled with a flowing medium, the piston extends into the locking chamber through a piston rod and reciprocates along its axis, the pressure relief end cover, the end cover and the cylinder body form a closed pressure relief chamber, and there are multiple pressure relief valves and one-way valves, which are distributed at equal intervals on the pressure relief end cover.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge and building structure earthquake resistance, and in particular relates to a speed locker with an automatic unlocking function. Background Art

[0002] In recent years, a series of severe earthquakes occurring around the world have prompted the bridge design industry to pay more attention to earthquake-resistant design, and have also led to the widespread use of vibration reduction devices such as speed lockers in highway, railway and municipal bridge projects.

[0003] As an important limit protection device in bridge seismic measures, the speed lock has the following working characteristics: it has almost no displacement restriction in low-speed working state, which is equivalent to being "placed" on the main structure; under the action of earthquake or vehicle braking, when the speed generated exceeds the threshold of the lock, the internal special fluid quickly and effectively converts the entire locking device into a rigid connecting rod, connecting its two ends into one, so that the displacement of the overall structure is constrained in the direction of the lock setting. In view of this feature, the speed lock is often used on the piers of the bridge where the movable bearings are placed, so that the piers can effectively share the horizontal force of the bridge system, avoiding the high cost problem caused by the use of piers with fixed bearings for seismic resistance alone, and realizing low-cost upgrade of the structural system.

[0004] However, if only the speed locker is used as an earthquake-resistant measure, once the earthquake exceeds the speed locker's bearing capacity, after the speed locker itself is destroyed, the building structure needs to continue to bear the earthquake. Even if appropriate structural measures can be taken to prevent the collapse of the structure, the structure will inevitably suffer extensive damage under the action of the earthquake.

[0005] Therefore, in actual engineering applications, in order to achieve better earthquake resistance, the speed lock is generally used together with other vibration reduction devices. However, the speed lock needs to be replaced after each earthquake regardless of the magnitude, which will greatly increase the maintenance cost after the earthquake. Summary of the invention

[0006] The purpose of the present invention is to provide a speed locker with an automatic unlocking function, which overcomes the problem in the prior art that the speed locker needs to be replaced after each earthquake, which greatly increases the maintenance cost after the earthquake.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A speed locker with an automatic unlocking function is characterized in that it includes a cylinder body, end covers are arranged at both ends of the cylinder body, a pressure relief end cover is arranged between the end covers, the pressure relief end cover and the cylinder body form a closed locking chamber, a pressure relief valve and a one-way valve are arranged on the pressure relief end cover, the locking chamber is filled with a flowing medium, the piston extends into the locking chamber through a piston rod and reciprocates along its axis, and the pressure relief end cover, the end cover and the cylinder body form a closed pressure relief chamber.

[0009] There are multiple pressure relief valves and one-way valves, which are evenly distributed on the pressure relief end cover.

[0010] The end cover is cylindrical and connected to the cylinder body through threads.

[0011] There are two pressure relief end covers, which together with the cylinder body form a closed locking chamber.

[0012] The annular gap between the piston and the cylinder forms a flow channel.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention provides a speed locker with an automatic unlocking function. A pressure relief device is arranged on the speed locker to serve as a functional switch for switching the seismic resistance system of the bridge under different earthquake actions. When the movement speed of the piston in the speed locker does not exceed the designed locking speed range, the speed locker can work normally. When the movement speed of the piston in the speed locker exceeds the designed locking speed range, the speed locker exits the operation through the pressure relief device, thereby ensuring that the speed locker itself is not damaged under the action of an earthquake and can still be used normally after the earthquake, thereby reducing the production, construction and maintenance costs of engineering components, reducing economic costs, and having high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a speed locker with automatic unlocking function of the present invention;

[0016] Figure 2 It is a structural cross-sectional view of the pressure relief device in the present invention.

[0017] Among them, 1-piston rod connector, 2-piston rod, 3-pressure relief end cover, 4-cylinder body, 5-flowing medium, 6-piston, 7-check valve, 8-pressure relief valve, 9-end cover, 10-cylinder body connector. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0019] The present embodiment provides a speed locker with an automatic unlocking function. A pressure relief device is arranged on the speed locker as a functional switch for switching the seismic resistance system of the bridge under different earthquakes. Under the action of a high-intensity earthquake, it can ensure that the speed locker safely exits operation, while under the action of a low-intensity earthquake, it satisfies the normal limiting function, thereby realizing the graded seismic resistance and system transformation functions of bridges and other building structures under different earthquakes, and successfully achieving the goal that the speed locker does not require maintenance under small earthquakes and can still be used under large earthquakes.

[0020] like Figure 1 As shown, a specific structure of a speed locker with automatic unlocking function is as follows: it includes a cylinder body 4, end covers 9 are arranged at both ends of the cylinder body 4, two pressure relief end covers 3 are arranged between the end covers 9, and a pressure relief valve 8 and a one-way valve 7 are arranged on the pressure relief end cover 3. The two pressure relief end covers 3 and the cylinder body 4 form a closed locking chamber, and the locking chamber area surrounded by the pressure relief end covers 3 and the cylinder body 4 is filled with a flow medium 5, and the piston 6 can reciprocate along its axis in this area. The pressure relief end cover 3, the end cover 9 and the cylinder body 4 constitute a closed pressure relief chamber. The annular gap between the piston 6 and the cylinder body 4 forms a flow channel, and the flow medium 5 can move from one of the two chambers separated by the piston 6 to the other chamber. The pressure relief valve 8 is also a one-way valve, which mainly plays a fuse protection role, that is, when the internal pressure of the speed lock exceeds the required failure upper limit, the pressure relief valve 8 opens, and the flow medium 5 is discharged into the pressure relief chamber through the pressure relief valve 8. As the flow medium in the locking function chamber continues to decrease, the speed locking function is lost. The one-way valve 7 mainly plays a role in post-earthquake repair. The fluid medium 5 can only flow to the locking chamber through the pressure relief chamber. After the earthquake is over, the pressure relief chamber can be filled with the fluid medium 5. After the pressure relief chamber is filled, the fluid medium 5 will flow to the locking chamber through the one-way valve 7. When the locking chamber is filled, the fluid medium 5 in the pressure relief chamber is reversely pumped out until it is completely pumped out, thereby achieving post-earthquake repair.

[0021] The end cover 9 is cylindrical and connected to the cylinder body 4 through threads. A static seal between the end cover 9 and the cylinder body 4 and a dynamic seal between the end cover 9 and the piston rod 2 are arranged inside.

[0022] The piston rod connector 1 and the piston rod 2 are connected by threads, and the cylinder connector 10 and the cylinder 4 are connected by threads.

[0023] like Figure 2 As shown, there are multiple one-way valves 7 and pressure relief valves 8, which are evenly spaced and distributed on the pressure relief end cover 3 in sequence.

[0024] The speed lock with automatic unlocking function works as follows:

[0025] Under the action of earthquake or braking force, when the movement speed of the piston 6 in the speed locker is within the designed locking speed range, the piston 6 moves in the locking function cavity formed by the pressure relief device and the cylinder 4, shearing the locking function flow medium 5 inside to realize the speed locking function;

[0026] When the speed of the speed lock inner piston 6 exceeds the designed locking speed range, the internal pressure of the flowing medium 5 exceeds the designed fixed value, the pressure relief valve 8 on the pressure relief end cover 3 opens the valve, the pressure relief valve opens, and the flowing medium 5 is discharged into the cavity formed by the pressure relief end cover 3, the end cover 9 and the cylinder body 4, and the fluid over-working pressure state is released. As the flowing medium 5 in the locking function cavity continues to decrease, the speed locking function is lost.

[0027] The one-way valve 7 is mainly used for repairing the speed locker after the dynamic action exceeding the designed locking speed ends. After the dynamic action exceeding the designed locking speed ends, the flow medium 5 can be filled into the pressure relief chamber. After the pressure relief chamber is filled, the flow medium 5 will flow to the locking chamber through the one-way valve 7. When the locking chamber is filled, the flow medium 5 in the pressure relief chamber is reversely pumped out until it is completely pumped out, thereby achieving the repair effect.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any equivalent structural changes made using the contents of the description and drawings of the present invention should be included in the patent protection scope of the invention.

Claims

1. A speed locker with automatic unlocking function, characterized in that: The invention comprises a cylinder body (4), end covers (9) are arranged at both ends of the cylinder body (4), two pressure relief end covers (3) are arranged between the end covers (9), the two pressure relief end covers (3) and the cylinder body (4) enclose a closed locking chamber, a pressure relief valve (8) and a one-way valve (7) are arranged on the pressure relief end cover (3), the locking chamber is filled with a flowing medium (5), a piston (6) extends into the locking chamber through a piston rod (2) and reciprocates along its axis, and the pressure relief end cover (3), the end cover (9) and the cylinder body (4) form a closed pressure relief chamber; the pressure relief valve (8) is a one-way valve, and the one-way valve (7) is used for repairing the speed locker after the power action exceeding the designed locking speed ends; when the power action exceeding the designed locking speed ends, the flowing medium (5) is filled into the pressure relief chamber, and after the pressure relief chamber is filled, the flowing medium (5) flows into the locking chamber through the one-way valve (7); when the locking chamber is filled, the flowing medium (5) in the pressure relief chamber is reversely pumped out until it is completely pumped out, thereby achieving the repairing effect.

2. The speed locker with automatic unlocking function according to claim 1, characterized in that: There are a plurality of pressure relief valves (8) and one-way valves (7), which are distributed on the pressure relief end cover (3) at equal intervals.

3. The speed locker with automatic unlocking function according to claim 2, characterized in that: The end cover (9) is cylindrical and connected to the cylinder body (4) via threads.

4. The speed locker with automatic unlocking function according to claim 3, characterized in that: The annular gap between the piston (6) and the cylinder body (4) forms a flow channel.

Images