CN106801379A - A kind of speed locking device - Google Patents

Abstract

A speed locking device, which belongs to the field of bridge anti-seismic technology, includes a cylinder body filled with viscous liquid, a pair of piston rods are arranged in the cylinder, the piston is divided into a left piston and a right piston, and there are joints on the two pistons respectively. There are flow holes, but the holes are staggered from each other; a spring is sandwiched between the two pistons, the two pistons and the spring are both worn on the piston rod, and can slide relative to the piston rod, and stoppers are respectively provided on the outside of the two pistons. When the piston rod moves slowly, the gap between the two pistons remains unchanged under the constraints of the stopper and the spring, and they move slowly together with the piston rod; when the piston rod is subjected to an impact load, the viscous liquid cannot quickly pass through the orifice, resulting in a large The damping force causes the spring to be compressed, the two pistons are tightly fitted together to cause the gap to disappear, and the orifice channel is closed to lock the device. The speed locking device of the present invention has simple structure and convenient processing, and can well adapt to the slow movement of the bridge under the influence of factors such as temperature changes.

Description

A speed lock device

technical field

The invention relates to the field of anti-seismic technology of bridges, in particular to a speed locking device for temporarily exerting a rigid connection function when a large continuous girder bridge is subjected to an impact load.

Background technique

In the prior art, the speed locking device in the field of bridge anti-seismic technology is a speed-dependent device. Its structure is composed of several parts such as a piston, a piston rod, a cylinder body and a viscous medium. Between the upper girder body and the pier. The working principle of the device is: when the bridge undergoes slow displacement due to loads such as temperature effects, shrinkage and creep, the device can adapt to the slow displacement of the structure through its own expansion and contraction, and produces small expansion and contraction resistance; When the displacement velocity of the bridge due to impact loads such as earthquake or braking force reaches a certain value, the device is instantly locked to become a rigid connecting member, realizing the sharing and transmission of forces between the piers in the continuous beam bridge structure.

However, there are more or less certain technical problems in the existing speed locking devices. For example, the utility model patent whose authorization announcement number is CN203654169U and whose name is "a speed locking force transmission device" and whose authorization announcement number is CN102628252B, and whose name is "used for bridge The invention patent of anti-seismic speed locking device" has the disadvantage that the high-viscosity medium cannot quickly pass through the tiny gap to achieve locking, and the gap is too small to increase the difficulty of processing and manufacturing; the authorized announcement number is CN103061250B, and the name is "a kind of The shortcoming of the invention patent of bridge hydraulic speed locking device is that the device relies on the locking valve to realize the locking function, and the structure is complicated; the invention patent with the authorized announcement number CN103952969B and the name of "intelligent speed locking device" has the following shortcomings: External devices are easily damaged during use. Therefore, it is particularly necessary to develop a speed locking device with simple structure, convenient processing, easy realization of locking function and stable performance.

Contents of the invention

The invention relates to a speed locking device, which specifically belongs to the field of anti-seismic technology of bridges.

In view of the deficiencies in the prior art above, the present invention aims to provide a speed locking device with simple structure, convenient processing, stable performance and easy realization of locking function.

In order to achieve the above object, the present invention has taken the following technical solutions:

A speed locking device, including a piston rod, a piston, a cylinder body, an end cover and a connecting piece, the two ends of the cylinder body are respectively provided with end covers, and the end cover is divided into a left end cover and a right end cover; the connecting piece is divided into a left connecting piece and a right end cover. Right connecting piece; the right end cover and the right connecting piece are welded together; the end cover is tightly connected and sealed with the cylinder body;

The cylinder is filled with viscous liquid, and the piston rod passes through the left and right end caps. The piston is composed of two parts, the left piston and the right piston. The left piston is provided with a first throttle hole, and the right piston is provided with a second throttle hole. Throttle hole, the hole position of the first throttle hole and the hole position of the second throttle hole are staggered; a spring is sandwiched between the left piston and the right piston, and the two pistons and the spring are both worn on the piston rod, and the two pistons It can slide relative to the piston rod, and stoppers are arranged on the outer sides of the two pistons respectively, and the stoppers are fixed on the piston rod.

Preferably, when the spring is in a freely stretched state, there is a gap between the two pistons; when the spring is in a compressed state, the two pistons can fit closely.

When the piston rod is subjected to a small load to produce a small displacement speed, the viscous liquid can slowly pass through the two orifices and generate a small damping force. Due to the stiffness of the spring, the small damping force is not enough to cause the spring to compress and deform. Under the constraints of the block and the spring, the left and right pistons keep the gap and move slowly with the piston rod; when the displacement speed of the piston rod is too high due to the impact load, the viscous liquid cannot quickly pass through the two orifices, resulting in a large damping force , the damping force causes the spring to be compressed instantly, causing the two pistons to closely fit together, and the passage formed by the two orifices is closed due to the disappearance of the gap, and the device is locked. When the impact load disappears, the two pistons are gradually separated under the spring pressure to restore the gap, and the viscous liquid can slowly pass through the two orifices again.

For viscous liquids, use silicone oil with a small viscosity-temperature coefficient.

The number and size of the orifice of the speed lock device and the stiffness of the spring are designed according to the locking force and locking speed.

When the displacement velocity of the piston rod is too high due to the impact load to the left, since the silicone oil in the left chamber cannot quickly pass through the first orifice, a large damping force is generated, which acts on the left piston and makes it Move to the right and then compress the spring, the spring is stressed and transmitted to the right piston, and the right piston cannot move due to the constraint of the right stopper. Therefore, under the action of the damping force, the spring is compressed to cause the left piston and the right piston to closely fit together. Since the gap between the two pistons disappears, the channel formed by the first orifice and the second orifice is closed, and the device is locked. When the impact load disappears, the left piston returns to its original position under the action of the spring pressure, the gap between the two pistons is restored, and the silicone oil can slowly pass through the two orifices again, so that the piston rod moves slowly again.

It is the same in the reverse direction: when the displacement velocity of the piston rod is too large due to the impact load to the right, since the silicone oil in the right chamber cannot quickly pass through the second orifice, a large damping force is also generated, and this damping force acts on the right On the piston and make it move to the left to compress the spring, the spring is stressed and transmitted to the left piston, and the left piston cannot move due to the constraint of the left stopper. Therefore, under the action of the damping force, the spring is compressed to cause the right piston and the left piston to closely fit together. Since the gap between the two pistons disappears, the channel formed by the second orifice and the first orifice is closed, and the device is locked. When the impact load disappears, the right piston returns to its original position under the spring pressure, the gap between the two pistons recovers, and the silicone oil can slowly pass through the two orifices again, so that the piston rod can move slowly again.

The speed locking device described in the present invention has a simple structure and is convenient to process and manufacture. The locking function is realized in the form that the gap between the two pistons is closed due to the pressure of the spring. This method is simple and effective, and can well adapt to the influence of factors such as temperature changes on the bridge. The slow movement under the ground, and play the role of rigid connecting rod in the event of an earthquake, can be used in bridge earthquake resistance and reinforcement of old bridges.

Description of drawings

Fig. 1 is a schematic side sectional view of the structure of an embodiment of the present invention;

Fig. 2 is a schematic diagram of a forward locking state according to an embodiment of the present invention;

Fig. 3 is a schematic diagram of a reverse locking state according to an embodiment of the present invention.

In the figure: 1—left connector, 2—left end cover, 3—cylinder body, 4—left block, 5—first throttle hole, 6—left piston, 7—spring, 8—right piston, 9—the first Two throttle holes, 10—right block, 11—piston, 12—right end cover, 13—right connector.

detailed description

The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

A preferred embodiment of a kind of speed locking device of the present invention, as shown in Figure 1, comprises a cylindrical cylinder body 3 among the figure, its two ends are respectively provided with left end cap 2 and right end cap 12, two end caps and cylinder body 3. Tightly connected and sealed, the cylinder body 3 is filled with viscous liquid, and the right end cover 12 and the right connecting piece 13 are welded together; the cylinder body 3 is provided with a piston rod 11, and the two ends of the piston rod pass through the left end cover 2 and the The right end cover 12 is sealed with the end cover; the left end of the piston rod 11 is welded to the left connecting piece 1, the left piston 6, spring 7, and right piston 8 are put on the piston rod 11 in turn, and the spring 7 is clamped between the two In the groove between the pistons, there is a certain gap between the left piston 6 and the right piston 8, and the left piston 6, the right piston 8 and the spring 7 can slide relative to the piston rod 11; The orifice 5 and the right piston 8 are provided with a second throttle hole 9, and the positions of the two throttle holes are staggered from each other; an annular left stopper 4 is provided on the left side of the left piston 6, and an annular right stopper is provided on the right side of the right piston 8 Block 10, two stoppers and piston rod 11 are welded and fixed.

Further, in this embodiment, when the spring 7 is in a state of free extension, there is a certain gap between the left piston 6 and the right piston 8; when the spring 7 is in a compressed state, the left piston 6 and the right piston 8 can snug fit.

Further, in this embodiment, the viscous liquid can be selected from silicone oil with a small viscosity-temperature coefficient.

Further, in this embodiment, when the piston rod 11 of the speed lock device moves slowly to the left, the silicone oil can slowly flow from the left chamber through the first orifice 5, the piston gap and the second orifice 9 to the right. Chamber, and produce a small damping force, because the spring 7 has a certain stiffness, this small damping force is not enough to make the spring 7 produce compression deformation, therefore, under the mutual constraints of the left stopper 4 and the right stopper 10 and the spring 7, the left piston 6 keeps a certain gap with the right piston 8 and moves slowly to the left along with the piston rod 11.

It is the same in the reverse direction: when the piston rod 11 moves slowly to the right, the silicone oil slowly flows into the left chamber from the right chamber through the second orifice 9, the piston gap and the first orifice 5, and generates a small damping force. Left stopper 4 and right stopper 10 and the mutual restraint of spring 7 under left piston 6 and right piston 8 keep certain clearance and follow piston rod 11 to move slowly to the right together.

Further, as shown in FIG. 2, in this embodiment, when the piston rod 11 is subjected to a leftward impact load and the displacement velocity is too high, since the silicone oil in the left chamber cannot quickly pass through the first orifice 5, a Larger damping force, this damping force acts on the left piston 6 and makes it move to the right to compress the spring 7, the spring 7 is stressed and transmitted to the right piston 8, the right piston 8 cannot move due to the constraint of the right stopper 10 . Therefore, under the action of the damping force, the spring 7 is compressed so that the left piston 6 and the right piston 8 are closely attached together. Since the gap between the two pistons disappears, the channel formed by the first orifice 5 and the second orifice 9 is closed. Device locked. After the impact load disappears, the left piston 6 returns to its original position under the pressure of the spring 7, the gap between the two pistons recovers, and the silicon oil can slowly pass through the two orifices again, so that the piston rod 11 moves slowly again.

It is the same in the reverse direction: as shown in Figure 3, in this embodiment, when the piston rod 11 is subjected to a rightward impact load and the displacement velocity is too high, the silicone oil in the right chamber cannot quickly pass through the second orifice 9 , also produces a large damping force, this damping force acts on the right piston 8 and makes it move to the left to compress the spring 7, the spring 7 is stressed and transmitted to the left piston 6, the left piston 6 is restrained by the left stopper 4 and cannot move. Therefore, under the action of the damping force, the spring 7 is compressed so that the right piston 8 and the left piston 6 are closely attached together. Since the gap between the two pistons disappears, the channel formed by the second orifice 9 and the first orifice 5 is closed. Device locked. After the impact load disappears, the right piston 8 returns to its original position under the pressure of the spring 7, the gap between the two pistons recovers, and the silicon oil can slowly pass through the two orifices again, so that the piston rod 11 can slowly move again.

During specific implementation, the number and size of the orifices of the speed locking device and the stiffness of the spring can be designed according to the locking force and locking speed.

From the above, the speed locking device of the present invention has a simple structure, is convenient to process, has the function of freely expanding and contracting at low speeds, and can lock itself when the speed is too high, and can well adapt to bridges under the influence of temperature changes and other factors. Slow movement, and provide the function of limiting and transferring load when the impact load is caused by earthquake and strong wind.

The above embodiments are only used to illustrate the present invention, rather than limit the present invention. Those of ordinary skill in the relevant technical fields can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the protection category of the present invention.

Claims (6)

1. a kind of speed locking device, it is characterised in that：Including piston rod, piston, cylinder body, end cap and connector, the two of cylinder body End is respectively equipped with end cap, and end cap is divided into left end cap and right end cap；Connector is divided into left connector and right connector；Right end cap and the right side Connector welds together；End cap is closely connected and seals with cylinder body；

Filling viscous liquid in cylinder body, piston rod is piercing in left end cap and right end cap, and the piston is by left piston and right piston two Part constitutes, and left piston is provided with first segment discharge orifice, and right piston is provided with the second throttle orifice, the hole position of first segment discharge orifice and second The hole position of throttle orifice mutually staggers；A spring is accompanied between left piston and right piston, two-piston and spring are set in piston On bar, two-piston relative can be slided with piston rod, and block is respectively equipped with the outside of two-piston, and block is fixed on piston rod.

2. a kind of speed locking device according to claim 1, it is characterised in that：The spring is in free elongation state When, gap is kept between two-piston；When spring is in compressive state, two-piston can be brought into close contact.

3. a kind of speed locking device according to claim 1, it is characterised in that：When piston rod is subject to small load action When producing thin tail sheep speed, viscous liquid can slow transit through two throttle orifices and produce small damping force, because spring has rigidity, This small damping force is insufficient to allow spring to produce compression, therefore, left and right two-piston keeps under the constraint of block and spring Gap follows piston rod to move slowly together；When and velocity of displacement that produce by the impact load when piston rod is excessive, due to viscous Stagnant liquid thus can not produce larger damping force quickly through two throttle orifices, and this damping force causes that spring moment is compressed causes two Piston is brought into close contact together, and the passage closure of two throttle orifices formation is caused because gap disappears, and the device is locked；Work as impact After load disappears, two-piston is gradually disengaged under spring pressure effect and recovers gap, and viscous liquid can slow transit through two sections again Discharge orifice.

4. a kind of speed locking device according to claim 1, it is characterised in that：Viscous liquid is smaller from viscosity-temperature coefficient Silicone oil.

5. a kind of speed locking device according to claim 1, it is characterised in that：The number of the throttle orifice of speed locking device The rigidity of amount and size and spring is designed according to latching force and lock speed.

6. a kind of speed locking device according to claim 1, it is characterised in that：When piston rod is subject to impact lotus to the left When carrying and producing velocity of displacement excessive, because the silicone oil of left chamber quickly through first segment discharge orifice, thus can not produce larger resistance Buddhist nun's power, this damping force is acted on left piston and it is moved to right and then compression spring, and spring stress simultaneously passes to right piston, right work Plug cannot be moved due to the effect of contraction by right block；Therefore damping force effect under, spring compressed cause left piston with Right piston is brought into close contact together, because two-piston gap disappears so that the passage that first segment discharge orifice is formed with the second throttle orifice is closed Close, device locking；After impact load disappears, left piston is reset between origin-location, two-piston under spring pressure effect Gap is recovered, and silicone oil can slow transit through two throttle orifices again so that piston rod is slowly moved again；

It is identical when reversely：When piston rod is subject to impact load to the right and produces velocity of displacement excessive, due to the silicon of right chamber room Oil can not equally produce larger damping force quickly through the second throttle orifice, and this damping force is acted in right piston and moves to left it And then compression spring, spring stress simultaneously passes to left piston, and left piston cannot be moved due to the effect of contraction by left block； Therefore under damping force effect, spring is compressed to be caused together with right piston is brought into close contact with left piston, because two-piston gap disappears Lose the passage closure that the second throttle orifice is formed with first segment discharge orifice, device locking；After impact load disappears, right piston Origin-location is reset under spring pressure effect, two-piston gap is recovered, and silicone oil can slow transit through two throttle orifices again so that living Stopper rod can be moved slowly again.