CN103527704B - A kind of composite hydraulic damping air cushion shock absorber - Google Patents

Abstract

The invention discloses a composite hydraulic damping air spring vibration isolator, which comprises an air bag, an upper cover plate and a lower sealing plate respectively arranged on the top and bottom of the air bag, and a hydraulic damping part; the hydraulic damping part includes: a liquid-sealed piston sleeve The cylinder is arranged in the air bag, and the upper end of the liquid-sealed piston sleeve is connected with the inner side of the upper cover plate; the piston is arranged in the liquid-sealed piston sleeve, and the piston is provided with a pair of piston holes along the The central axis of the piston is symmetrical; the first spring cover is set at the lower end of one of the piston holes; the second spring cover is set at the upper end of the other piston hole; the present invention can improve pulse vibration and low frequency The vibration isolation performance improves the secondary vibration isolation performance, avoids dislocation caused by air leakage and pressure drop, and ensures the position of the protected equipment.

Description

A composite hydraulic damping air spring vibration isolator

technical field

The invention relates to a vibration isolator, in particular to a composite hydraulic damping air spring vibration isolator.

Background technique

Air spring is a new type of elastic element. It is a non-metallic spring that fills a flexible closed air chamber with compressed air and uses the compressibility of the air to achieve elastic action. It has the functions of cushioning, vibration reduction and movement. The air spring has excellent elastic characteristics, which is different from ordinary springs. Compared with rubber springs, steel springs have many advantages, the most prominent of which is that it can achieve low spring stiffness under large loads.

The biggest structural feature of the existing air springs is the ability to absorb and isolate high-frequency vibrations, but it requires the cooperation of the pressure inside the airbag. When the internal pressure of the airbag is too high or too low, the vibration isolation effect and stability will deteriorate. When the internal pressure is too high, the secondary vibration isolation effect is poor. When the internal pressure is too low, displacement may occur, that is, displacement will occur in three directions, which is not allowed for some special working conditions. If you want The vibration isolator realizes frequency modulation or has a wide vibration isolation frequency band to avoid misalignment, poor secondary vibration isolation performance, rigid collision accidents, and damage to the protected equipment or other equipment.

Contents of the invention

The purpose of the present invention is to provide a composite hydraulic damping air spring vibration isolator. The mechanism skillfully integrates hydraulic damping components and air springs, which can not only adjust the vibration isolation frequency band, but also improve the vibration isolation performance of pulse vibration and low frequency vibration. , improve the performance of secondary vibration isolation, avoid dislocation caused by air leakage and pressure drop, ensure the position of the protected equipment, improve the safety and reliability of the protected equipment, and respond sensitively to shocks, enabling the system to quickly Reset, prolonging the service life of the vibration isolator.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

A composite hydraulic damping air spring vibration isolator, which includes an air bag, an upper cover plate and a lower sealing plate respectively arranged on the top and bottom of the air bag, and is characterized in that it also includes:

Hydraulic damping components;

The hydraulic damping components include:

A liquid-sealed piston sleeve, which is arranged in the air bag, and the upper end of the liquid-sealed piston sleeve is connected to the inner side of the upper cover plate;

The piston is arranged in the liquid-sealed piston sleeve, and the piston is provided with a pair of piston holes, and the pair of piston holes are symmetrical along the central axis of the piston;

The first spring cover, the first spring cover is set at the lower end of one of the piston holes;

The second spring cover is arranged on the upper end of the other piston hole;

Corresponding to the first piston spring arranged in the piston hole and connected to the first spring cover, when the piston moves upward, the first piston spring receives the pressure of the liquid and opens the first spring cover;

Corresponding to the second piston spring arranged in the piston hole and connected to the second spring cover, when the piston moves downward, the second piston spring receives the pressure of the liquid and opens the first spring cover.

The hydraulic damping component also includes:

One end of the plunger is connected with the bottom of the piston, and the other end is extended outside the lower sealing plate.

The vibration isolator also includes a pair of limiting plates, which are respectively vertically arranged on both sides of the lower sealing plate.

The vibration isolator also includes a limit spring and a bottom plate, the bottom plate is connected with the other end of the plunger; the limit spring is arranged between the bottom plate and the lower sealing plate.

Compared with the prior art, the present invention has the following advantages:

1. When subjected to low-frequency, sudden, and pulse impacts, it is mainly borne by springs; when subjected to high-frequency impacts, it is jointly borne by springs, hydraulic dampers, and air bags; therefore, this vibration isolator is sensitive to impacts and is installed on the instrument. Enhance the effect of high and low frequency vibration isolation, and make the system reset quickly.

2. It has a limit structure, protects the spring, and determines the maximum displacement of the vibration isolator, which can make full use of the space and bring convenience to the selection.

3. With a linkage structure, the hydraulic damping inside the air bag can coordinate the air bag and the lower buffer spring. The displacement distance of the piston is greater than the static deformation of the spring under rated load. After the spring fails, the air bag still plays a damping effect. Therefore, the hydraulic damping cooperates with the air bag and the spring to produce multi-stage vibration isolation; the lower spring can promote the quick reset of the piston, and the linkage effect is remarkable.

4. The hydraulic damping part not only buffers the high-frequency vibration but also cooperates with the lower spring to absorb a large amount of low-frequency vibration.

Description of drawings

Fig. 1 is the structural representation of hydraulic damping part of the present invention;

Fig. 2 is a structural schematic diagram of a composite hydraulic damping air spring vibration isolator of the present invention;

Figure 3 shows the relationship between the deformation displacement of the air bag, the bearing deformation displacement of the limit spring, the length of the limit plate, the length of the liquid-sealed piston sleeve and the stroke length.

Detailed ways

The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

As shown in Figure 1, a composite hydraulic damping air spring vibration isolator includes an air bag 1, an upper cover plate 2 and a lower sealing plate 3 respectively arranged on the top and bottom of the air bag 1, and hydraulic damping components.

As shown in Figures 1 and 2, the hydraulic damping components include: a liquid-sealed piston sleeve 41, which is arranged in the air bag 1, and the upper end of the liquid-sealed piston sleeve 41 is connected to the inner side of the upper cover plate; a piston 42, which is arranged in the liquid In the piston sleeve 41, the piston 42 is provided with a pair of piston holes 421, and the pair of piston holes 421 are symmetrical along the central axis of the piston; the first spring cover 43, the first spring cover 43 The lower end of one of the piston holes 421 is set; the second spring cover 44 is arranged on the upper end of another piston hole 421; the corresponding first piston spring 45 is arranged in the piston hole 421 and is connected with the first spring cover 43, when the piston When 42 moves upward, the first piston spring 45 is subjected to the pressure of the liquid, and opens the first spring cover 43; correspondingly arranged in the piston hole 421 and connected with the second spring cover 44, the second piston spring 47, when the piston 42 When moving downward, the second piston spring 47 is subjected to the pressure of the liquid and opens the second spring cover 44; the plunger 46 has one end connected to the bottom of the piston 42 and the other end extended outside the lower sealing plate 3 .

The mechanism also includes a pair of limiting plates 5, which are respectively vertically arranged on both sides of the lower sealing plate 3; a limiting spring 6 and a bottom plate 7, and the bottom plate 7 is connected to the other end of the plunger 46; The spring 6 is arranged between the bottom plate 7 and the lower sealing plate 3 .

The working principle of hydraulic damping components:

In the liquid-sealed piston sleeve 41 , the piston 42 moves upward, the first piston spring 45 receives liquid pressure, and the first spring cover 43 opens. The size of the first piston spring 45 subjected to the hydraulic pressure is related to the size of the vibration, the amplitude is large, the spring deformation is large, the amplitude of the opening of the first spring cover 43 is also large, and the amplitude decreases, and the opening of the first spring cover 43 decreases. Played the role of damping. On the contrary, the piston 42 moves downward, the second piston spring 47 is subjected to liquid pressure, and the second spring cover 44 opens. The vibration amplitude is large, the spring deformation is large, and the opening range of the second spring cover 44 is also large, and the amplitude decreases, and the opening range decreases, which plays the role of hydraulic damping. When the pressure in the air bag decreases, the hydraulic damping part can play a role. Prevent misalignment caused by free vibration in three directions and protect the instrument.

When the vibration isolator is subjected to low-frequency pulse and large-amplitude vibration, the instrument is connected to the installation port 71 of the bottom plate 7, and is subjected to the vibration impact on the upper cover plate 2. The limit spring 6 can first absorb the large-amplitude vibration of the pulse, and the air bag 1 cushions it. impact. At the same time, the linkage between the hydraulic damping component and the limit spring 6 can generate damping and absorb vibration, and the limit spring 6 can promote the reset of the hydraulic damping.

When the vibration isolator is vibrated by low-frequency pulse and small amplitude, it is impacted by the vibration on the upper cover plate 2, and the air bag 1 can buffer and effectively absorb high-frequency vibration. When the load exceeds the load of the limit spring 6, the limit spring 6 is protected by the limit plate 5, and the hydraulic damping component cooperates with the air bag 1 to still absorb vibration. When the load is too large, the hydraulic damping part can play a position-limiting role, and the protection device will not fail to protect the instrument.

The present invention can carry out model selection to each component according to specific use conditions, such as: the deformation displacement of the air bag 1; the bearing deformation displacement of the limit spring 6; the length of the limit plate 5; Refer to Figure 3 for the interrelationships among the various component options.

In summary, the present invention is a composite hydraulic damping air spring vibration isolator. The mechanism cleverly integrates hydraulic damping components and air springs, which can not only adjust the vibration isolation frequency band, but also improve the vibration isolation of pulse vibration and low frequency vibration. performance, improve the performance of secondary vibration isolation, avoid dislocation caused by air leakage and pressure drop, ensure the position of the protected equipment, improve the safety and reliability of the protected equipment, and respond sensitively to shocks, enabling the system Rapid reset prolongs the service life of the vibration isolator.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (4)

1. a composite hydraulic damping air cushion shock absorber, comprises air bag (1), is separately positioned on cover plate of upper layer (2) and lower floor's shrouding (3) of air bag (1) top and bottom, it is characterized in that, also comprise:

Hydraulic damping parts;

Described hydraulic damping parts comprise:

Fluid-tight piston sleeve (41), it is arranged in air bag (1), and described fluid-tight piston sleeve (41) upper end is connected with inside cover plate of upper layer;

Piston (42), it is arranged in fluid-tight piston sleeve (41), and described piston (42) offers pair of pistons hole (421), and the piston hole (421) described in a pair is symmetrical along piston medial axis;

First spring cover plate (43), the first described spring cover plate (43) arranges one of them piston hole (421) lower end;

Second spring cover plate (44), it is arranged on another piston hole upper end;

Correspondence is arranged on the first piston spring (45) be connected in piston hole (421) and with the first spring cover plate (43), and when piston (42) moves upward, first piston spring (45) is subject to the pressure of liquid, and opens the first spring cover plate (43);

Correspondence is arranged on the second piston spring (47) be connected in piston hole (421) and with the second spring cover plate (44), and when piston (42) moves downward, the second piston spring (47) is subject to the pressure of liquid, and opens the second spring cover plate (44).

2. composite hydraulic damping air cushion shock absorber as claimed in claim 1, it is characterized in that, described hydraulic damping parts also comprise:

Plunger (46), its one end is connected with piston (42) bottom, and it is outside that its other end is extended on lower floor's shrouding (3).

3. composite hydraulic damping air cushion shock absorber as claimed in claim 1, it is characterized in that, also comprise a pair limiting board (5), it is vertically arranged on lower floor's shrouding (3) both sides respectively.

4. composite hydraulic damping air cushion shock absorber as claimed in claim 2, it is characterized in that, also comprise limit spring (6) and base plate (7), described base plate (7) is connected with plunger (46) the other end; Described limit spring (6) is arranged between base plate (7) and lower floor's shrouding (3).