CN220365895U

CN220365895U - Nitrogen spring overtravel protection structure

Info

Publication number: CN220365895U
Application number: CN202321255884.6U
Authority: CN
Inventors: 刘电飞; 石教港; 马东阳; 张彩霞
Original assignee: Wuhan Dongfeng Connll Die&mould Standard Parts Co ltd
Current assignee: Wuhan Dongfeng Connll Die&mould Standard Parts Co ltd
Priority date: 2023-05-19
Filing date: 2023-05-19
Publication date: 2024-01-19
Anticipated expiration: 2033-05-19

Abstract

The utility model relates to the technical field of stamping die nitrogen springs and discloses a nitrogen spring overtravel protection structure, which comprises a cylinder barrel and a plunger rod arranged in the cylinder barrel, wherein a limit sleeve is arranged between the plunger rod and the cylinder barrel, the top of the limit sleeve is higher than the top of the cylinder barrel, an accommodating groove is arranged on the outer wall of the limit sleeve, a sealing O-shaped ring is arranged in the accommodating groove, the sealing O-shaped ring props against the inner wall of the cylinder barrel and the bottom of the accommodating groove, an annular air leakage groove is formed in the inner wall of the cylinder barrel and is positioned below the sealing O-shaped ring, and the distance between the air leakage groove and the sealing O-shaped ring is smaller than the distance between the top of the limit sleeve and the top of the cylinder barrel. The over-travel protection structure of the nitrogen spring prevents the nitrogen spring from being burst due to the fact that the internal pressure is too high.

Description

Nitrogen spring overtravel protection structure

Technical Field

The utility model relates to the technical field of stamping die nitrogen springs, in particular to a nitrogen spring overtravel protection structure.

Background

In the stamping die industry, the application of the elastic element is very wide, and with the continuous development of the die industry, the requirement on the elastic element is gradually increased. The nitrogen spring is advantageous in saving a die space by virtue of the advantage that the nitrogen spring can provide a larger return force and occupies a relatively smaller space, thereby simplifying the die design and reducing the manufacturing cost, and has been widely applied to stamping dies.

The working pressure of the nitrogen spring is mainly provided by high-pressure nitrogen in the cylinder body, so that in the working process, if the condition of overtravel of a plunger rod after the compression of the nitrogen spring occurs, the inner space of the cylinder barrel is reduced, the corresponding pressure is increased, the cylinder barrel of the nitrogen spring is possibly expanded and burst due to the excessive pressure, an overtravel protection structure is needed, and when the plunger rod in the nitrogen spring overtravel, the overtravel protection structure starts to take effect, so that the excessive pressure in the nitrogen spring leaks out through the overtravel protection structure, and the explosion of the cylinder barrel is prevented, thereby affecting the personal safety and the die safety.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide an overtravel protection structure of a nitrogen spring, which can prevent the nitrogen spring from being burst due to overhigh internal pressure.

In order to achieve the above purpose, the nitrogen spring overtravel protection structure comprises a cylinder barrel and a plunger rod arranged in the cylinder barrel, wherein a limit sleeve is arranged between the plunger rod and the cylinder barrel, the top of the limit sleeve is higher than the top of the cylinder barrel, an accommodating groove is formed in the outer wall of the limit sleeve, a sealing O-shaped ring is arranged in the accommodating groove and props against the inner wall of the cylinder barrel and the bottom of the accommodating groove, an annular air leakage groove is formed in the inner wall of the cylinder barrel and is positioned below the sealing O-shaped ring, and the distance between the air leakage groove and the sealing O-shaped ring is smaller than the distance between the top of the limit sleeve and the top of the cylinder barrel.

Preferably, an annular weakening groove is formed in the inner wall of the cylinder barrel, and the distance between the weakening groove and the sealing O-shaped ring is larger than the distance between the top of the limit sleeve and the top of the cylinder barrel.

Preferably, a steel wire retainer ring is arranged between the limiting sleeve and the cylinder barrel, a hemispherical annular groove for accommodating the steel wire retainer ring is formed in the cylinder barrel, a limiting step is formed in the outer side of the limiting sleeve, the steel wire retainer ring is positioned above the limiting step to prop against the limiting step, and the limiting sleeve is fixed and prevented from falling off.

Preferably, a dust ring is sleeved on the top of the limit sleeve, and the dust ring is positioned between the limit sleeve and the cylinder barrel, so that dust and sundries are prevented from entering the cylinder barrel, and the plunger rod is prevented from being worn or the pressure in the cylinder barrel is prevented from rising.

Compared with the prior art, the utility model has the following advantages:

1. when the nitrogen spring is overtravel, the sealing ring can enter the air leakage groove to achieve the air leakage effect, so that the nitrogen spring is prevented from being burst due to the overtravel, and the safety of field personnel and a die is ensured;

2. under extreme conditions, the gap between the sealing ring and the cylinder barrel can be enlarged through the extrusion deformation of the cylinder barrel, and the gas can be discharged.

Drawings

FIG. 1 is a schematic diagram of an overtravel protection structure for a nitrogen spring according to the present utility model;

FIG. 2 is a schematic view of the seal O-ring position of FIG. 1;

FIG. 3 is a schematic view of another embodiment of the over-travel protection structure of the nitrogen spring of the present utility model;

fig. 4 is a schematic view of the sealing O-ring position of fig. 3.

The reference numerals of the components in the drawings are as follows:

the cylinder barrel 1, the plunger rod 2, the limit sleeve 3, the accommodating groove 4, the sealing O-shaped ring 5, the air leakage groove 6, the weakening groove 7, the steel wire check ring 8, the hemispherical annular groove 9, the limit step 10 and the dust ring 11.

Detailed Description

The utility model will now be described in further detail with reference to the drawings and to specific examples.

As shown in fig. 1 and 2, a nitrogen spring overstroke protection architecture, including cylinder 1 and the plunger rod 2 of installing in cylinder 1, be equipped with stop collar 3 between plunger rod 2 and the cylinder 1, the top of stop collar 3 exceeds the top of cylinder 1, be equipped with accommodation groove 4 on the outer wall of stop collar 3, be equipped with sealed O-ring 5 in the accommodation groove 4, sealed O-ring 5 supports the inner wall of cylinder 1 and the bottom of accommodation groove 4, it has annular air escape groove 6 to open on the cylinder 1 inner wall, air escape groove 6 is located the below of sealed O-ring 5, distance between air escape groove 6 and sealed O-ring 5 is less than the distance between stop collar 3 top and the cylinder 1 top.

When the embodiment is used, when the piston rod 2 is overtravel in the nitrogen spring, the limit sleeve 3 can be downwards shifted, the sealing O-shaped ring 5 is downwards shifted into the air leakage groove 6, internal high-pressure air is discharged from the air leakage groove 6, and the cylinder barrel 1 is prevented from being burst due to overhigh pressure.

In addition, in another embodiment, as shown in fig. 3 and 4, an annular weakening groove 7 is formed in the inner wall of the cylinder barrel 1, the distance between the weakening groove 7 and the sealing O-ring 5 is larger than the distance between the top of the stop collar 3 and the top of the cylinder barrel 1, so that when the stop collar 3 is in extreme condition and is displaced downwards until the stop collar is flush with the top of the cylinder barrel 1, when the cylinder barrel 1 is extruded when the cylinder barrel is continuously pressed downwards, the annular weakening groove 7 is formed in the inner wall of the cylinder barrel 1, the position of the weakening groove 7 of the cylinder barrel 1 is extruded and deformed first, the gap between the sealing O-ring 5 and the cylinder barrel 1 is enlarged, internal gas is discharged from the gap, and the cylinder barrel 1 is prevented from being cracked due to overhigh pressure.

In addition, in the above embodiment, the steel wire retainer ring 8 is arranged between the stop collar 3 and the cylinder barrel 1, the hemispherical annular groove 9 for accommodating the steel wire retainer ring 8 is arranged on the cylinder barrel 1, the stop step 10 is arranged on the outer side of the stop collar 3, and the steel wire retainer ring 8 is positioned above the stop step 10 to prop against the stop step 10, so that the stop collar 3 is fixed, and the stop collar 3 is prevented from falling off.

Finally, in the above embodiment, the top of the stop collar 3 is sleeved with the dust ring 11, and the dust ring 11 is located between the stop collar 3 and the cylinder 1, so as to prevent dust and sundries from entering the cylinder 1, and abrasion of the plunger rod 2 or pressure rise in the cylinder 1 are caused.

According to the over-travel protection structure of the nitrogen spring, when the nitrogen spring is over-travel, the sealing O-shaped ring 5 can enter the air leakage groove 6 to achieve the air leakage effect, so that the nitrogen spring is prevented from being burst due to the over-travel, and the safety of field personnel and a die is ensured; in extreme cases, the gap between the sealing O-shaped ring 5 and the cylinder 1 can be enlarged by the extrusion deformation of the cylinder 1, and the gas can be discharged.

Claims

1. The utility model provides a nitrogen spring overtravel protection architecture, includes cylinder (1) and installs plunger rod (2) in cylinder (1), its characterized in that: be equipped with stop collar (3) between plunger rod (2) with cylinder (1), the top of stop collar (3) exceeds the top of cylinder (1), be equipped with accommodation groove (4) on the outer wall of stop collar (3), be equipped with sealed O type circle (5) in accommodation groove (4), sealed O type circle (5) support the inner wall of cylinder (1) with the bottom of accommodation groove (4), it has annular air escape groove (6) to open on the inner wall of cylinder (1), air escape groove (6) are located the below of sealed O type circle (5), air escape groove (6) with distance between sealed O type circle (5) is less than distance between stop collar (3) top with the cylinder (1) top.

2. The nitrogen spring overstroke protection architecture of claim 1, wherein: an annular weakening groove (7) is formed in the inner wall of the cylinder barrel (1), and the distance between the weakening groove (7) and the sealing O-shaped ring (5) is larger than the distance between the top of the limit sleeve (3) and the top of the cylinder barrel (1).

3. The nitrogen spring overstroke protection architecture of claim 1, wherein: the novel steel wire cylinder is characterized in that a steel wire retainer ring (8) is arranged between the limiting sleeve (3) and the cylinder barrel (1), a hemispherical annular groove (9) for accommodating the steel wire retainer ring (8) is formed in the cylinder barrel (1), a limiting step (10) is formed in the outer side of the limiting sleeve (3), and the steel wire retainer ring (8) is located above the limiting step (10) to prop against the limiting step (10).

4. The nitrogen spring overstroke protection architecture of claim 1, wherein: the top of the limit sleeve (3) is sleeved with a dust ring (11), and the dust ring (11) is positioned between the limit sleeve (3) and the cylinder barrel (1).