CN212004070U - Nitrogen spring with explosion-proof air-leakage piston rod - Google Patents

Abstract

The utility model discloses a nitrogen spring with an explosion-proof air leakage piston rod, which comprises a cylinder body, a bush and a piston rod, wherein an outer sealing ring is arranged between the cylinder body and the bush, and an inner sealing ring is arranged between the bush and the piston rod; and the upper part of the piston rod is provided with a pressure relief groove, the pressure relief groove extends from the upper part of the piston rod to the middle part of the piston rod, and when the nitrogen spring exceeds the stroke, the lower end of the pressure relief groove can fall below the inner sealing ring. The nitrogen spring structure is improved by combining a sealing principle, and the nitrogen spring can be protected in the using process, so that cylinder explosion is effectively avoided, and the safety protection effect is achieved.

Description

Nitrogen spring with explosion-proof air-leakage piston rod

Technical Field

The utility model relates to nitrogen spring survivorship technical field, concretely relates to nitrogen spring with explosion-proof disappointing piston rod.

Background

In the mold industry, elastomeric elements have been used in large quantities; over the years, the mold technology and the mold manufacturing level have been greatly developed and improved, the demand of industrial products for molds is increasing, and the molds are rapidly developed towards the directions of precision, complexity, high efficiency and long service life. The nitrogen spring can provide larger return force, and has the advantages of saving the die space, simplifying the die design and manufacture, reducing the die cost, facilitating the die adjustment and the like; the nitrogen spring system can be used as an independent part and installed in a die for use, can also be designed into a nitrogen spring system, is used as a part of the die for participating in work, can conveniently realize constant elastic pressure and delayed action in the system, is an elastic part with flexible performance, and is applied to the fields of automobile dies, household appliance dies, electronic dies and the like by the nitrogen spring.

The nitrogen spring is a novel elastic component using high-pressure nitrogen as a working medium, has inherent height and standard use stroke in the use process, exceeds the use stroke of the nitrogen spring when the mould is in misoperation or fault conditions, and is easy to cause the damage of the nitrogen spring and even the cylinder explosion phenomenon due to the fact that the high-pressure nitrogen is filled in the nitrogen spring, and has high safety risk.

Meanwhile, when the nitrogen spring is used alone, if the internal compression space is insufficient and the internal pressure is increased due to the influence of the external environment, the risk of cylinder explosion exists; when the actuating unit is used in series with a pipeline as a control unit, if the actuating unit is stuck or limited due to a mold, and the air cylinder of the control unit is still compressed, equipment damage or mold damage can be caused.

Disclosure of Invention

The utility model aims at providing a nitrogen gas spring with explosion-proof disappointing piston rod combines sealed principle to improve nitrogen gas spring structure, can provide the protection to nitrogen gas spring in the use to effectively avoid exploding the jar, reach the safety protection purpose.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a nitrogen gas spring with explosion-proof disappointing piston rod which the key lies in: the cylinder comprises a cylinder body, a bushing fixed in the cylinder body and a piston rod arranged in the bushing in a limiting manner, wherein an outer sealing ring is arranged between the cylinder body and the bushing, and an inner sealing ring is arranged between the bushing and the piston rod; and the upper part of the piston rod is provided with a pressure relief groove, the pressure relief groove extends from the upper part of the piston rod to the middle part of the piston rod, and when the nitrogen spring exceeds the stroke, the lower end of the pressure relief groove can fall below the inner sealing ring.

Furthermore, the bottom of piston rod is formed with the spacing ring be formed with interior concave section, conical surface section and the arc changeover portion that connects gradually between piston rod and the spacing ring, the lower extreme of interior concave section with the spacing ring is connected, interior concave section in form the recess between conical surface section and the spacing ring, conical surface section from the bottom up diameter reduces gradually, just the diameter of conical surface section lower extreme is greater than the piston rod, the upper end of arc changeover portion with the lower extreme of piston rod links to each other.

Furthermore, the difference between the diameters of the lower end and the upper end of the conical surface section is 0.5 mm.

Furthermore, the upper portion of the inner side wall of the cylinder body is provided with a limiting groove for fixing the bushing, a steel wire clamping ring is arranged in the limiting groove, and the bushing is limited and fixed in the cylinder body through the steel wire clamping ring.

Furthermore, first mounting groove and deformation groove have been seted up on the outer wall of bush respectively, just first mounting groove is located the below in deformation groove set up in the first mounting groove the outer seal circle still be formed with the safety ring between sealing washer mounting groove and the deformation groove, the external diameter of safety ring with the external diameter of bush is unanimous.

Furthermore, the width of the pressure relief groove is 0.5 mm-3 mm, and the depth is 0.5 mm-2.5 mm.

The utility model discloses a show the effect and be: the structure is simple, the design is novel, the implementation cost is low, the scheme improves the structure of the nitrogen spring by combining the sealing principle, and the pressure relief groove is formed in the piston rod, so that the pressure relief groove cannot pass through the inner sealing ring under the normal use condition, and the nitrogen spring works normally; when leading to the overtravel because equipment trouble or maloperation, before equipment has not contacted the cylinder body yet, the pressure release groove of piston rod has surpassed interior sealing washer, and the inside high-pressure nitrogen pressure of cylinder body releases in the twinkling of an eye, and the mould continues down nitrogen spring cylinder body even if by pressure deformation or fracturing, can not produce the risk of bursting, has protected field operation personnel's safety.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a cross-sectional view of the present invention;

FIG. 3 is a view of the bushing being vented;

FIG. 4 is a state diagram of the piston rod relief groove being vented;

FIG. 5 is a cross-sectional view of the bushing;

fig. 6 is a cross-sectional view of the piston rod.

Detailed Description

The following provides a more detailed description of the embodiments and the operation of the present invention with reference to the accompanying drawings.

As shown in fig. 1-6, a nitrogen spring with explosion-proof piston rod that loses heart, including cylinder body 1, be fixed in bush 2, the spacing piston rod 3 of installing in bush 2 of cylinder body 1 the spacing groove that is used for fixing bush 2 is offered on the upper portion of the inside wall of cylinder body 1 the spacing inslot is provided with steel wire snap ring 4, bush 2 is fixed in through this steel wire snap ring 4 is spacing in cylinder body 1 be provided with outer seal ring 5 and outer dust ring 6 between cylinder body 1 and the bush 2 be provided with interior sealing washer 7 and interior dust ring 8 between bush 2 and the piston rod 3, the bottom of piston rod 3 is formed with spacing ring 9.

A clearance area 1a is arranged at the upper part of the inner side wall of the cylinder body 1, the clearance area 1a is arranged below the lower end face of the lining 2, the upper end face of the lining 2 protrudes out of the upper end face of the cylinder body 1, the length of the part of the lining 2 protruding out of the cylinder body 1 is 3-20 mm, and when the nitrogen spring exceeds the stroke, the lining 2 is pressed down, so that the outer sealing ring 5 is pressed to the clearance area 1 a; further, the clearance area 1a is an annular arc surface groove.

Through the length of extension bush 2, bush 2 top no longer with 1 parallel and level of nitrogen spring cylinder body, after the mould down contacts nitrogen spring, nitrogen spring piston rod 3 descends, if machine trouble or maloperation lead to the overstroke, the mould descends until contacting bush 2, bush 2 descends for outer seal ring 5 of bush 2 in cylinder body 1 is pressed to keeping away empty regional 1a, and 1 internal pressure of cylinder body is released in the twinkling of an eye, even the mould forces down to crush cylinder body 1 and also can not produce the danger of bursting. Meanwhile, when the mold has an over-stroke condition, the cylinder body 1 is stressed and deformed, and the cylinder body 1 becomes thinner due to the arrangement of the clearance area 1a, so that the cylinder body 1 can be stressed and deform outwards at the clearance area 1a when being subjected to pressure exceeding the limit, a larger gap is formed between the outer sealing ring 5 and the inner wall of the cylinder body 1, the pressure relief of high-pressure nitrogen is accelerated, the cylinder explosion is further effectively avoided, and the safety factor is improved.

Preferably, a first installation groove 21 and a deformation groove 22 are respectively formed in the outer wall of the bushing 2, the first installation groove 21 is located below the deformation groove 22, the outer sealing ring 5 is arranged in the first installation groove 21, a safety ring 23 is further formed between the first installation groove 21 and the deformation groove 22, and the outer diameter of the safety ring 23 is consistent with the outer diameter of the bushing 2. And a second mounting groove 24 for fixing and limiting the inner dust ring 8 is formed in the inner wall of the top of the bushing 2.

Preferably, the deformation groove 22 is formed by a right-angle section 22a and an arc-shaped section 22b, the right-angle section 22a and the arc-shaped section 22b are in smooth transition, and the right-angle section 22a is located below the arc-shaped section 22b and is close to the safety ring 23. The cambered groove end 22b is designed to be irreplaceable by other right-angle designs, and can provide more stable compressive stress, increase the compressive capacity and increase the stability of the whole bushing. Specifically, the method comprises the following steps:

the width of the right-angle groove section 22a is greater than that of the arc-surface groove section 22b, the width of the first mounting groove 21 is less than that of the deformation groove 22, and the depth of the first mounting groove 21 is greater than that of the deformation groove 22.

In this embodiment, the width of the right-angle groove section 22a is 2mm, the radius of the circle where the arc-shaped groove section 22b is located is 1.5mm, and the width of the safety ring 23 is 1 mm.

In specific practical process, through seting up deformation groove 22 at bush 2 and form safety ring 23 between sealing washer mounting groove and second deformation groove 22, when 1 internal pressure of cylinder body exceeded the threshold value, make safety ring 23 take place deformation, in drawing outer seal ring 5 and splitting and getting into cylinder body middle part C type groove, because the contact space grow, outer seal ring 5 warp or tear so that outer seal ring 5 loses sealed effect, the inside high-pressure medium of cylinder body 1 obtains the release and realizes the pressure release, thereby the risk of exploding the jar has been avoided, further destruction has been cut off, equipment has been protected.

In this embodiment, a pressure relief groove 31 is formed in the upper portion of the piston rod 3, the pressure relief groove 31 extends from the upper portion to the middle portion of the piston rod 3, and the lower end of the pressure relief groove 31 can fall below the inner seal ring when the nitrogen spring is overstroked.

The piston rod 3 is provided with the pressure relief groove 31, so that the pressure relief groove 31 cannot pass through the inner sealing ring 8 under the normal use condition, and the nitrogen spring works normally; when leading to the overtravel because equipment trouble or maloperation, before equipment has not contacted cylinder body 1 yet, the pressure release groove 31 of piston rod 3 has surpassed interior sealing washer 8, and the inside high-pressure nitrogen gas pressure of cylinder body 1 releases in the twinkling of an eye, and the mould continues down nitrogen spring cylinder body 1 even if by pressure deformation or fracturing, can not produce the risk of bursting, has protected field operation personnel's safety.

Further, the piston rod 3 with be formed with interior concave section 32, conical surface section 33 and the arc changeover portion 34 that connect gradually between the spacing ring 9, the lower extreme of interior concave section 32 with the spacing ring 9 is connected, interior concave section 32 in form the recess between conical surface section 33 and the spacing ring 9, conical surface section 33 from the bottom up diameter reduces gradually, just the diameter of conical surface section 33 lower extreme is greater than the piston rod 3, the upper end of arc changeover portion 34 with the lower extreme of piston rod 3 links to each other.

Further, the width of the pressure relief groove 31 is 0.5 mm-3 mm, and the depth is 0.5 mm-2.5 mm.

This embodiment sets up through outstanding in the cylinder body 1 up end with bush 2, offers relief groove 31 on piston rod 3 simultaneously to realized the duplicate protection to the nitrogen spring, effectively improved the security of nitrogen spring when the overtravel.

The technical scheme provided by the utility model is introduced in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims (6)

1. The utility model provides a nitrogen gas spring with explosion-proof piston rod that loses heart which characterized in that: the cylinder comprises a cylinder body, a bushing fixed in the cylinder body and a piston rod arranged in the bushing in a limiting manner, wherein an outer sealing ring is arranged between the cylinder body and the bushing, and an inner sealing ring is arranged between the bushing and the piston rod; and the upper part of the piston rod is provided with a pressure relief groove, the pressure relief groove extends from the upper part of the piston rod to the middle part of the piston rod, and when the nitrogen spring exceeds the stroke, the lower end of the pressure relief groove can fall below the inner sealing ring.

2. A nitrogen spring having an explosion-proof venting piston rod according to claim 1 wherein: the piston rod is characterized in that a limiting ring is formed at the bottom of the piston rod, an inward concave section, a conical section and an arc transition section are formed between the piston rod and the limiting ring, the inward concave section, the conical section and the arc transition section are sequentially connected, the lower end of the inward concave section is connected with the limiting ring, a groove is formed between the conical section and the limiting ring, the diameter of the conical section is gradually reduced from bottom to top, the diameter of the lower end of the conical section is larger than that of the piston rod, and the upper end of the arc transition section is connected with the lower end of the piston.

3. A nitrogen spring having an explosion-proof venting piston rod according to claim 2 wherein: the difference between the diameters of the lower end and the upper end of the conical surface section is 0.5 mm.

4. A nitrogen spring having an explosion-proof venting piston rod according to claim 1 wherein: the upper portion of the inner side wall of the cylinder body is provided with a limiting groove used for fixing the bushing, a steel wire clamping ring is arranged in the limiting groove, and the bushing is limited and fixed in the cylinder body through the steel wire clamping ring.

5. A nitrogen spring having an explosion-proof venting piston rod according to claim 1 wherein: first mounting groove and deformation groove have been seted up on the outer wall of bush respectively, just first mounting groove is located the below in deformation groove set up in the first mounting groove the outer seal circle still be formed with the safety ring between sealing washer mounting groove and the deformation groove, the external diameter of safety ring with the external diameter of bush is unanimous.

6. A nitrogen spring with an explosion-proof air-release piston rod according to any one of claims 1 to 5, wherein: the width of the pressure relief groove is 0.5 mm-3 mm, and the depth is 0.5 mm-2.5 mm.

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