KR100405167B1 - Friction Snubber - Google Patents

Abstract

The present invention relates to a friction type shock absorber that converts shock energy such as shock or vibration into thermal energy due to mechanical friction and releases it into the atmosphere, and accumulates into elastic energy and then gradually releases thermal energy due to friction to damp the impact. .

Friction shock absorber according to the present invention, the piston rod is formed at one end; A first fixed end fixed to a socket coupled to the other end of the piston rod; A wedge fluidly coupled to the piston rod; An elastic member for absorbing a dynamic load applied through the first fixing end between the adjuster and the wedge fixed to the socket in an axially movable position; A cylinder having a second fixed end formed at one end and accommodating the piston rod; And an inclined portion projecting on the inner side is in close contact between the protrusion and the wedge and an outer circumferential surface is in close contact with the cylinder inner circumference, and the inner sloping portion is pressed in the circumferential direction by the wedge and the protrusion so that the outer circumferential surface is rubbed on the cylinder inner circumferential surface. A friction damper having such a structure can be made compact and light in weight due to its simple structure, and it is possible to reduce the management cost by eliminating the need for post management and to have high cushioning efficiency. .

Description

Friction Shock Absorber {Friction Snubber}

The present invention relates to a friction type shock absorber that attenuates the shock caused by dynamic load by converting the impact energy due to dynamic force such as shock or vibration into thermal energy due to mechanical friction and gradually releasing it into the atmosphere. When the dynamic load is applied between the two members while supporting the two members, the impact energy is converted into thermal energy due to mechanical friction and released into the atmosphere, and part of it is accumulated as the elastic energy of the elastic member that is elastically displaced within the elastic limit. It then relates to a friction shock absorber that damps the impact by progressively converting and releasing it into mechanical frictional heat energy.

Dynamic loads acting on the piping system of a specific device include facilities such as water hammering caused by mechanical vibration transmitted through a rotating machine such as a pump or a turbine, and sudden opening and closing of the valve, and impulse due to pipe breakage. Dynamic loads generated by internal factors, and dynamic loads generated by external factors such as wind loads and shocks caused by seismic forces and explosions in the surroundings are classified.

Generally, shock absorbers that absorb and attenuate the kinetic energy of dynamic loads when they are applied to the piping system are classified as friction buffers and hydraulic shock absorbers according to their driving method. The hydraulic shock absorber is subject to many limitations in use due to the surrounding environment, that is, temperature, humidity, radiation, viscosity of hydraulic oil, and the like.

That is, since the hydraulic shock absorber is filled with hydraulic oil there is a problem that the internal structure is complicated and the post-management cost increases, it is relatively difficult to install as a weight. In addition, the response is inferior to the slow movement, such as the constant vibration, and when the oil leaks due to the wear of the sealing portion loses the buffer function, there is also a problem that can not adjust the buffer force after setting. In addition, when the hydraulic oil is leaked, it is not possible to perform a buffer function when dynamic load is applied, the buffer force is different depending on the movement speed of the pipe, there was also a problem that the use is limited. To solve this problem, a mechanical shock absorber having a simple structure and no hydraulic oil has been developed.

However, even in the case of a mechanical shock absorber, the built-in parts are sensitive to wear, and the piston rod is sensitive to bending or axial load due to offset during installation. If the damaged or lubricated at the lubrication site, there was a problem such that the buffer function (lock-up).

For this reason, in recent years, friction buffers have been developed and used in consideration of the powerful power of hydraulic shock absorbers and the fact that mechanical shock absorbers can be used universally without being restricted from the surrounding environment.

It is an object of the present invention to provide a friction type shock absorber which is simple in structure and easy to install due to its small size and light weight, and requires no after-care.

Another object of the present invention is to provide a friction shock absorber that can easily adjust the internal buffering force even after installation, and to maintain a uniform buffering force at all times by the compression force of the built-in spring.

It is still another object of the present invention to provide a friction buffer having excellent responsiveness to constant vibrations, vibrations caused by hammering, and earthquakes with little movement.

Still another object of the present invention is to reduce the impact or vibration by the vibration energy of the piston rod due to the dynamic load to the thermal energy, the friction buffer which can prevent the component from being deformed and fatigued due to thermal stress To provide.

1 is a perspective view of a friction buffer according to an embodiment of the present invention.

2 is a cross-sectional view taken along the line II-II of Figure 1 showing the configuration of a friction shock absorber according to an embodiment of the present invention.

3 is a cross-sectional view taken along line III-III of FIG. 2;

Figure 4 is an operation showing sequentially the operation of the friction shock absorber according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

One ; First fixed end 2; 2nd fixed end

3; Cylinder 4; Damping member

5; Lining 6; Wedge

7; Washer 8; Elastic member

9; Piston rod 10; regulator

The object of the present invention described above is a piston rod having a protruding portion at one end thereof, a first fixed end fixed to a socket connected axially to the other end of the piston rod, and a wedge fluidly coupled to the piston rod; It is installed between the adjuster and the wedge fixed to the socket so as to be movable in the axial direction, the elastic member for absorbing shock when the dynamic load is applied through the first fixed end, and the second fixed end is formed at one end and the dynamic load is The cylindrical cylinder for receiving the piston rod vibrating in the axial direction when applied through the first fixed end, and the inclined portion in close contact between the protrusion and the wedge is formed on the inner side, the outer side is in close contact with the inner circumference of the cylinder, the dynamic load is 1 Press the inclined part in the circumferential direction of the cylinder by the wedge pressed by the compressive force of the elastic member when applied through the fixed end to the outer surface It is achieved by providing a friction shock absorber, characterized in that it comprises a damping member that attenuates shock and vibration in frictional contact with the inner circumference.

According to a preferred embodiment, the damping member is at least 2 so as to increase the pressing force of the damping member by the wedge when the dynamic load is applied through the above-mentioned first fixed end and the elastic member so that the damping member can be in strong friction contact with the inner circumference of the cylinder. Divided into more than two.

According to a preferred embodiment, a liner for increasing the frictional force of the damping member is provided between the damping member and the cylinder inner circumference.

According to a preferred embodiment, a turn buckle is installed between the first fixed end and the socket so as to adjust the elastic force of the elastic member by rotating the above-described adjuster.

According to a preferred embodiment, two shafts are staggered so that a bearing part for fixing and supporting the two shafts at the first fixed end and the second fixed end, respectively, is provided so as to damp the impact even when the dynamic load is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art to which the present invention pertains, and thus the present invention It does not mean that the technical spirit and scope of the company is limited.

As shown in Figures 1 and 2, the friction buffer according to an embodiment of the present invention, the piston rod (9) having a protrusion (9a) formed at one end, and the other end of the piston rod (9) in the axial direction A first fixed end 1 fixed to the socket 12 movably connected to position, a wedge 6 movably coupled to the piston rod 9, and an axially movable position to the socket 12 It is installed between the adjuster 10 and the wedge 6, which are securely fixed, the elastic member 8 (compression coil spring) that absorbs shock when the dynamic load is applied through the first fixed end 1, and the second end at one end. The fixed end 2 is formed and the cylindrical cylinder 3 which receives the piston rod 9 which oscillates axially when dynamic load is applied through the 1st fixed end 1, and the protrusion 9a and the wedge. Inclined portion (4a) in close contact between the (6) and the outer surface is in close contact with the inner periphery of the cylinder (3), the dynamic load is the first fixed end (1) Pressing the inclined portion 4a in the circumferential direction of the cylinder 3 by the wedge 6, which is pressed by the compressive force of the elastic member 8 when applied through the outer surface is in friction contact with the inner circumference of the cylinder 3 impact And a damping member 4 for damping vibrations.

At this time, preferably, when the dynamic load is applied through the first fixed end 1 and the elastic member 8 described above, the pressing force of the damping member 4 by the wedge 6 is increased to increase the damping member 4. The damping member 4 is divided into three (one example, divided into three) in the circumferential direction, as shown in FIG. 3, so as to be in strong friction contact with the inner circumference of the cylinder 3.

In addition, a liner 5 for increasing contact friction between the damping member 4 and the inner circumference of the cylinder 3 is provided, and the elastic force of the elastic member 8 can be adjusted by rotating the adjuster 10. 1 The turn buckle 13 is installed between the fixed end 1 and the socket 12, and the two fixed shafts are alternately installed so that the shock can be damped even when dynamic loads are applied. In the fixed end 2, bearing portions 1a and 2a are fixed to support the two shafts, respectively.

The friction type shock absorber according to the present invention having such a configuration absorbs and attenuates the impact according to the dynamic load applied to the first fixed end side through the operation of FIGS. 4A to 4F.

As shown in (a), when dynamic loads (impact or vibration, etc.) are applied to the first fixed end 1 in a stationary state, the impact energy thereof is integrated into the first fixed end 1 in one end. It is transmitted to the elastic member 8 through the connected turn buckle 13, the socket 12 having one end fixed to the other end of the turn buckle 13, and the adjuster 10 fixed to the other end of the socket 12. Accordingly, the elastic member 8 transfers the impact energy to the wedge 6 as shown in (b) while accumulating a part of the impact energy as the elastic energy, and the damping member 4 is not locked yet. ), While the damping member 4 is moved forward, the component force in the circumferential direction is applied to the inclined surface 4a so as to be in close contact with the inner circumferential surface of the cylinder 3. The piston rod 9 is moved forward while the speed is greatly relaxed by the friction force between the damping member 4 and the cylinder 3, the damping member 4 and the wedge 6 is a piston rod (9) Advance with), etc., it is fixed at a position where the frictional force between the damping member 4 and the cylinder 3 is greater than the dynamic load. In this process, the impact caused by dynamic load acting on the first fixed end 1 is firstly alleviated, and a part of the impact energy is converted into thermal energy generated by friction between the damping member 4 and the cylinder 3 to the atmosphere. Exhausted

Then, when the damping member 4 is stopped by the frictional force, as shown in (c), the regulator 10 moving forward with the piston rod 9 or the like presses the elastic member 8, and the elastic member ( 8) compresses and deforms the residual impact energy as compressive elastic energy by compressive deformation by the pressing force.

Then, when the dynamic load acting on the first fixed end of the regulator 10 reaches a point smaller than the elastic force of the elastic member 8, as in (d), the elastic member 8, which has been compressed, is subjected to the previous compression displacement. Restoring the elastic force according to the retractor 10 to move the piston rod 9 and the like. At this time, the damping member 4 advances a predetermined distance with the piston rod 9 by the protrusion 9a of the piston rod 9 which presses the rear inclined surface 4b, and then as shown in (e). Likewise, the roller 3 is tightly fixed to the inner circumferential surface of the cylinder 3 by the frictional force due to the circumferential component force received from the protrusion 9a. In this process, a part of the residual impact energy that has been changed and accumulated by the compressive elastic energy in the elastic member 8 is converted into thermal energy generated by friction between the wedge 6 and the cylinder 3 and is released into the atmosphere. When the damping member 4 is relocated to the cylinder 3, the piston rod 9 or the like re-advances to the reaction force acting on the first fixed end, as shown in (f) according to its inertia. Accordingly, the damping member 4 is re-advanced by the pressing force of the wedge 6 and is fixed to the cylinder 3 again by frictional force due to the circumferential component force, and then the regulator 10 moves the elastic member 8 to the initial displacement amount. By recompressing with a smaller displacement amount, the friction shock absorber according to one embodiment of the present invention operates in the same process as when the initial dynamic load is applied to the first fixed end, while absorbing a part of the residual impact energy into the damping member 4 and the cylinder. (3) Changes to frictional heat between and releases into the atmosphere.

As described above, the friction type shock absorber according to the embodiment of the present invention generates the impact energy due to the dynamic load acting on the first fixed end 1 while repeating the reciprocating process of the piston rod 9 and the damping member 4. The impact can be greatly alleviated by changing all the heat energy due to frictional contact between the damping member 4 and the inner peripheral surface of the cylinder 3 to the atmosphere.

On the other hand, the friction buffer according to an embodiment of the present invention to mitigate the impact through the process as described above the damping member (4) is divided into three members in the longitudinal direction to the contact friction force against the inner peripheral surface of the cylinder (3) By increasing, the impact or vibration damping rate due to dynamic load acting on the first fixed end 1 is high.

In addition, the friction type shock absorber according to an embodiment of the present invention can easily adjust the cushioning force even after installation in a predetermined place, there is an advantage that the distance between the first fixed end and the second fixed end can be adjusted. That is, the turn buckle 13 is installed between the first fixing end 1 and the socket 12 to rotate the turn buckle 13 in the left or right direction in a state where the turn buckle 13 is fastened to a predetermined position so that the first fixing end and the socket ( 12) it is possible to adjust the buffer force by adjusting the distance between, it is also possible to adjust the distance between the first fixed end and the second fixed end.

In addition, since the bearings rotatable within a predetermined angle range are installed at the first fixed end and the second fixed end, respectively, there is an advantage that the two axes supporting each other are not parallel.

As described in detail above, the friction type shock absorber according to the present invention has a simple structure and is compact and light in weight, so that it is easy to install, and after-care is unnecessary, thereby reducing maintenance costs. After installation, the cushioning force can be easily adjusted, and the uniform buffering force can be maintained at all times by the compression force of the built-in spring. In addition, it is excellent in responsiveness to vibrations and earthquakes caused by hammering and constant vibrations which are insignificant.

By gradually converting the shock and vibration energy of the piston rod due to dynamic load to thermal energy and exhausting it to attenuate the shock or vibration, the parts can be prevented from being deformed and destroyed due to thermal stress.

Claims (5)

A piston rod having a protrusion formed at one end and a first fixed end formed at the other end thereof, a wedge movably coupled to the piston rod, and an adjuster and wedge axially fixed to a socket formed at an outer circumference of the piston rod. A second fixing end is formed at one end, a cylinder for accommodating the piston rod, a turn buckle installed between the first fixing end and the adjuster, and an inclined portion of the inner side is closely contacted between the protrusion and the wedge. In a friction type shock absorber having a damping member having an outer circumferential surface in close contact with the inner circumferential surface of the cylinder and having a frictional contact with the inner circumferential surface of the cylinder when the dynamic load is transferred axially through the first fixed end, the damping member according to the dynamic load: And the damping member is divided into at least two or more along the circumferential direction so as to increase the contact frictional force with respect to the inner circumferential surface of the cylinder. delete The method of claim 1, And the damping member is attached to an outer circumferential surface thereof and further includes a liner for increasing friction against the inner circumferential surface of the cylinder. delete delete