CN2054047U

CN2054047U - Three-section combined spring vibration absorber

Info

Publication number: CN2054047U
Application number: CN 89207337
Authority: CN
Inventors: 顾长清; 常乃麟
Original assignee: BEIJING MECHANIZED CONSTRUCTION Co
Current assignee: BEIJING MECHANIZED CONSTRUCTION Co
Priority date: 1989-05-24
Filing date: 1989-05-24
Publication date: 1990-03-07

Abstract

The utility model discloses a novel vibration dampening mechanism for vibration sinking and pulling pile hammers. The vibration dampening mechanism is combined by an upper, a middle and a lower three stages of springs. When the vibration dampening mechanism is used to press piles, the upper and the middle springs are connected in series; when the vibration dampening mechanism is used to pull piles, the upper and lower springs are connected in series. Compared with products of the same kind, with few pollution and long service life, the vibration dampening mechanism improves the vibration isolation property of a damper, improves job conditions and reduces the damage to pile frames. With the actual measurement on worksite, the effect of vibration damping of the utility model is displayed as follow: the amplitude of a host machine is 5 mm in the process of pile pulling, the amplitude of an upper crossbeam is 0.2 mm, and the driving ratio of the vibration dampening mechanism is 0.04. Thus, the utility model is superior to the existing products.

Description

Three-section combined spring vibration absorber

The utility model relates to the common mechanical field of engineering technology, is a kind of damper mechanism that is used to vibrate pile pulling sinker.

The pile vibrosinking pressurization is the technology that China uses at first and extensively promoted.The shock absorber that is used for pressurization is two groups of springs up and down commonly, see figure one.This system of mechanism is made up of upper spring (5) and lower spring (8) as seen from the figure.But parameter size of lower spring is identical on it, and therefore the pretension amount of a spring, has reduced vibration isolating effect for the decrement that another spring stayed.Especially more obvious when pile sinking pressurizes.Because last lower spring dimensional parameters is identical, when pile pulling, pile pulling power is bigger, and the use of spring is comparatively abundant; When pressurizeing, plus-pressure is less, and the use of spring is abundant its strength just, a waste that Here it is.

The purpose of this utility model just is to adopt three sections cluster spring shock absorbers, under the prerequisite of design height that does not increase former spring cushion and volume, utilize the spring series connection, on promptly when piling, medi-spring (5), (6) series connection, upper and lower spring (5), (8) series connection when pile pulling, the global stiffness of cluster spring when reducing pile sinking and pile pulling, thus the effectiveness in vibration suppression of shock absorber improved greatly.

Embodiment of the present utility model is to adopt the three groups of springs in upper, middle and lower (5), (6), (8), shown in figure two.Because of less, the shared height of medi-spring (6) rigidity that increases little; So the middle footpath of upper and lower main spring (5), (8), silk footpath and pitch are all constant, only length reduces.Like this, the first, upper and lower spring series connection has reduced the global stiffness of cluster spring, thereby has improved damping effect during pile pulling; The second, go up during pressurization, medi-spring (5), (6) series connection, reduced the global stiffness of cluster spring, also improved damping effect; The 3rd, medi-spring (6) is softer, meets the less requirement of plus-pressure, and upper and lower spring (5), (8) are harder, meet the bigger requirement of pile pulling power.

Details are as follows for embodiment of the present utility model.

Figure one is the schematic diagram of common common shock absorber by the two sections spring assembly.

Figure two is the schematic diagram of three sections cluster spring shock absorbers that the utility model adopted.

Figure three is the front view of this structure.

Figure four is the local amplification profile A-A of figure three.

When pile pulling sinker carried out pile pulling, top rail (1) upwards promoted, axle (2) and cover (14) relative slip, compression upper spring (5).The upper end of upper spring (5) reaches axle (2) by spring base (4) and nut (3) with counter-force, and axle (2) is spring base (16) and sliding sleeve (17) slip relatively, moves up.At this moment, the shaft shoulder (19) of axle (2) upwards draws sleeve (15), and medi-spring (6) integral body moves up, and spring length is constant.So, top rail (1) and main frame (13) though distance increased, but medi-spring (6) is loosening, does not also produce additional vibration noise.Meanwhile, axle (2) lower end and nut (10) and band spiral fluted spring base (9) link, the compression lower spring (8) that rises, and counter-force reaches seat board (7).Seat board (7) links with main frame (13).At this moment, upper spring (5) and lower spring (8) are subjected to force compresses simultaneously.Main frame (13) thus vibration owing to reach the purpose of vibration damping through the series connection of upper and lower spring.

During piling, by the drop-down pulley of wire rope (12), pulley yoke (18) moves down.Pulley yoke (18) links by nut (10) and axle (2) lower end.Axle (2) moves down, and the axle upper end is by nut (3) and upper spring seat (4) compression upper spring (5), and crossbeam (1) is pressed in the lower end of upper spring (5).Axle (2) and cover (14) relative slip.Crossbeam (1) moves down, compression medi-spring (6), medi-spring (6) distortion, wedge plate (7).Like this, the vibration of main frame (13) reaches the purpose of vibration damping by the series connection of medi-spring (6) and upper spring (5).Along with axle (2) moves down, spring base (9) is left behind lower spring (8), because band spiral fluted spring base (9) has been fixed lower spring (8), when axle (2) and nut (3) relative displacement, lower spring (8) unclamps with seat board (7) and does not contact, and this just can not produce the noise that the bump of the loosening and seat board 7 of spring produces because of vibration.

The utility model does not increase the spring total height, does not increase the cumulative volume of vibration hammer compared with similar products, just can greatly improve the anti-vibration performance of vibration isolator. Thereby reduced noise pollution, and improved workman's condition of work, reduced the destruction of vibration to pile frame, prolonged the life-span of pile frame.

Three sections cluster spring shock absorbers of the present utility model, through the actual measurement in building site, its effectiveness in vibration suppression is as follows: main frame amplitude 5mm in the pile pulling process, entablature amplitude 0.2mm, its gearing factor are 0.2/5=0.04, greatly are better than existing product.

Claims

1, a kind of spring cushion that is used to vibrate heavy pile pulling is characterized in that:

A. combine by the three sections springs in upper, middle and lower (5), (6), (8);

B. there is the shaft shoulder (19) at the middle part of axle (2), and sleeve (15) tightly overlaps on it, and the bottom of medi-spring (6) is enclosed within the outer wall of sleeve (15), during piling, goes up, medi-spring (5), (6) series connection;

C. the bottom of axle (2) is band spiral fluted spring base (9), and lower spring (8) overlaps thereon, during pile pulling, and upper and lower spring (5), (8) series connection.