CN113090696A

CN113090696A - Overpressure protection nitrogen spring, overpressure over-stroke protection nitrogen spring and protection sheet

Info

Publication number: CN113090696A
Application number: CN202110429069.6A
Authority: CN
Inventors: 吕峰; 徐豪; 朱锴
Original assignee: JIAXING NYC INDUSTRIAL CO LTD
Current assignee: JIAXING NYC INDUSTRIAL CO LTD
Priority date: 2021-04-21
Filing date: 2021-04-21
Publication date: 2021-07-09

Abstract

The invention discloses an overpressure protection nitrogen spring, an overpressure over-stroke protection nitrogen spring and a protection sheet, and the key points of the technical scheme are as follows: the utility model provides an excessive pressure (excessive pressure overtravel) protection nitrogen spring, includes cylinder body, piston rod, bush, the cylinder body bottom is provided with safety arrangement, safety arrangement including dismantling end cap, screening glass, sealing washer and at spheroid or cylinder that the screening glass top is connected, the screening glass bonds or welds in the connected method of spheroid or cylinder, also can be screening glass and cylinder structure as an organic whole, this form structure is called the lug. The safety protection device and the cylinder body are detachably connected, and the detachable plug is provided with an air vent. The invention realizes the nitrogen spring overvoltage protection (overvoltage overtravel protection) through the safety protection device, and the safety protection device can be replaced after the overvoltage (overvoltage overtravel).

Description

Overpressure protection nitrogen spring, overpressure over-stroke protection nitrogen spring and protection sheet

Technical Field

The invention relates to the field of nitrogen springs, in particular to an overpressure protection nitrogen spring, an overpressure over-stroke protection nitrogen spring and a protection sheet.

Background

The nitrogen spring (or called nitrogen cylinder or nitrogen cylinder) is a novel elastic component using high-pressure nitrogen as a working medium, has the advantages of small volume, large elasticity, long stroke, stable work, precise manufacture, long service life (generally reaching one million times of extension), gentle elasticity curve, no need of pre-tightening and the like, is applied to a die (particularly an automobile stamping die), can complete the work which is difficult to complete by conventional elastic components such as a metal spring, rubber and an air cushion and the like, can effectively simplify the design and manufacture of the die, is convenient for the installation and adjustment of the die, prolongs the service life of the die and ensures the stability of the product quality.

The existing nitrogen spring mainly comprises a cylinder body, a piston rod, a bushing and a sealing ring. The existing nitrogen spring has no overpressure protection structure, and when the pressure in the cylinder body is too high, the cylinder body is easy to burst and safety accidents are possibly caused; and part of the nitrogen spring is also provided with an overtravel protection structure, namely, a thin-wall structure is arranged at a specific position of the cylinder body, so that the wall thickness at the position of the thin-wall structure is thinned, and the thin-wall structure is firstly broken when the pressure in the cylinder body is overlarge, thereby playing a protection role. But the thin-wall structure is difficult to realize, the wall thickness is difficult to control, and the actual operation is difficult to realize.

Therefore, there is a need for an improved structure that overcomes the above-mentioned deficiencies.

Disclosure of Invention

The invention aims to provide an overpressure protection nitrogen spring, an overpressure over-stroke protection nitrogen spring and a protection sheet, wherein the overpressure protection of the nitrogen spring is realized through a safety protection device, and the nitrogen spring can be reused after the protection sheet is replaced, so that the cost is saved.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides an overvoltage protection nitrogen spring, includes cylinder body, piston rod, bush, its characterized in that: the cylinder body is provided with a step through hole, the cylinder body is provided with a safety protection device corresponding to the step through hole,

safety arrangement closes including the lid the screening glass of step through-hole, locate the sealing washer between step through-hole and the screening glass, can dismantle connect in cylinder body and restriction screening glass break away from the end cap dismantled of step through-hole, just can dismantle the end cap and seted up the air vent.

The invention is further configured to: the end face, which is abutted by the sealing ring, in the step through hole is a step through hole sealing face, and the sealing ring is positioned between the protection sheet and the step through hole sealing face.

The invention is further configured to: can dismantle the end cap and offer the deformation cavity that supplies protection piece deformation towards the one end of protection piece, deformation cavity and air vent intercommunication.

The invention is further configured to: the terminal surface sets up the groove of disappointing that supplies gas outgoing in the venthole under the cylinder body, the groove one end and step through-hole intercommunication of disappointing, the other end with cylinder body lateral wall intercommunication, screening glass warp or break during the excessive pressure, and cylinder body intracavity gas is in proper order through step through-hole, deformation cavity, air vent, by the groove of disappointing discharge of disappointing.

The invention is further configured to: the utility model provides an excessive pressure stroke protection nitrogen spring has foretell excessive pressure protection nitrogen spring, terminal surface bonds or welds spheroid or cylinder formation lug in the screening glass, and the lug supplies piston rod tip to contradict and makes the screening glass warp, and the screening glass warp or breaks during the excessive pressure stroke, and cylinder body intracavity gas is in proper order through step through-hole, deformation cavity, air vent, by the discharge of losing heart groove.

The invention is further configured to: the convex block is formed by integrating a protection plate and a cylinder body, and the ball body or the cylinder body at the upper end of the convex block is positioned at the center of the step through hole.

The invention is further configured to: a protection sheet is applied to the overpressure protection nitrogen spring or the overpressure overtravel protection nitrogen spring.

The invention is further configured to: the protection plate is made of steel, copper or aluminum alloy.

The invention is further configured to: the protection piece is plane shape, or a plurality of deformation grooves which are convenient for the deformation or the rupture of the protection piece are arranged on one end face of the protection piece.

The invention is further configured to: the deformation groove is linear or annular, and when the deformation groove is linear, the deformation groove is arranged in a radial manner. The bottom of the deformation groove can be in a V shape, a U shape or a rectangular shape.

In conclusion, the invention has the following beneficial effects:

when in use, the detachable plug butts against the protection plate, namely, one end edge of the protection plate facing to the inner cavity of the cylinder body butts against the sealing ring to realize sealing, and the other end edge butts against the detachable plug, so that the protection plate is ensured to reach the position of fixing and sealing the inner cavity of the cylinder body; when cylinder body cavity pressure is too big (excessive pressure), because the screening sheet only border position contradicts in dismantling the end cap, screening sheet surface is towards the crooked deformation of air vent direction after the pressurized, and then lead to the screening sheet border to produce the displacement and change and produce the space for the sealing washer, the gas of excessive pressure enters mainly to the air vent and discharges through this space position in the cylinder body, thereby perhaps the screening sheet produces the damaged confession excessive pressure gas outgoing, realize overvoltage protection, if need reuse, only need change the screening sheet.

After the cylinder body inner chamber excessive pressure, the screening glass produces deformation and makes the internal gas of cylinder let out, and this gas is discharged from cylinder body lateral wall position behind air vent, the groove of loosing heart in proper order, through letting out the groove, conveniently discharges the gas of excessive pressure.

In the normal stroke range of the nitrogen spring, the piston rod is not contacted with the ball body or the cylinder body after being compressed, when the piston rod moves through stroke compression, the end part of the piston rod is abutted against and drives the ball body or the cylinder body to move downwards, and the ball body or the cylinder body drives the protection plate to deform, so that a gap is formed between the protection plate and the sealing ring, and the air leakage effect is achieved; in addition, because a gap for gas in the cylinder body to contact the protection plate is reserved between the ball body or the cylinder body and the step through hole, when the inner cavity of the cylinder body is in overpressure and the piston rod is not in contact with the ball body or the cylinder body, the protection plate is under the pressure of overpressure gas and deforms, and then a gap is formed between the protection plate and the sealing ring for the overpressure gas to leak out, so that overpressure stroke protection is realized.

Drawings

FIG. 1 is a first sectional view of embodiment 1;

FIG. 2 is an enlarged view of section A of FIG. 1;

FIG. 3 is a second sectional view of example 1, showing the deformation of the protective sheet when the nitrogen spring is overpressurized;

FIG. 4 is an enlarged view of section B of FIG. 3;

FIG. 5 is a bottom view of embodiment 1 for showing the shape of the bottom surface of the cylinder block;

FIG. 6 is a first sectional view of the embodiment 2, which is used for showing a structure in which a sphere or a cylinder is spherical;

FIG. 7 is an enlarged view of section C of FIG. 6;

FIG. 8 is a second sectional view of embodiment 2, showing a state in which the nitrogen spring overtravel is;

FIG. 9 is an enlarged view of section D of FIG. 8;

FIG. 10 is a third sectional view of example 2 for showing a structure in which a spherical body or a cylindrical body is columnar and is welded to a protective sheet;

FIG. 11 is a fourth sectional view of example 2 for showing a structure in which a spherical body or a cylindrical body is columnar and is integrally formed with a protective sheet;

FIG. 12 is a first front view of the preferred embodiment 4;

FIG. 13 is the second front view of the embodiment 4;

FIG. 14 is a first sectional view of the embodiment 4, which shows that the cross section of the deformation groove is rectangular in the state of FIG. 12 or FIG. 13;

FIG. 15 is a second sectional view of the embodiment 4, which shows that the cross section of the deformation groove is arc-shaped in the state of FIG. 12 or FIG. 13;

FIG. 16 is the third front view of the preferred embodiment 4;

FIG. 17 is a third sectional view of the embodiment 4 for showing that the deformation groove is rectangular in the state of FIG. 16;

FIG. 18 is a fourth sectional view of the embodiment 4 for showing that the deformation groove is curved in the state of FIG. 16.

The corresponding part names indicated by the numbers in the figures: 1. a cylinder body; 2. a piston rod; 3. a bushing; 4. a stepped through hole; 5. a stepped through hole sealing surface; 6. a protective sheet; 7. a seal ring; 8. the plug can be disassembled; 9. a vent hole; 10. a deformation chamber; 11. a gas release groove; 12. a sphere or cylinder; 13. a deformation groove; 14. a bump; 15. an inner end surface.

Detailed Description

In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easy to understand, the invention is further described with reference to the figures and the specific embodiments.

Example 1: as shown in fig. 1 to 5, the overpressure protection nitrogen spring provided by the invention comprises a cylinder body 1, a piston rod 2 and a bushing 3, wherein the cylinder body 1 is provided with a step through hole 4, and the cylinder body is provided with a safety protection device corresponding to the step through hole 4.

Wherein safety arrangement closes including the lid the screening glass 6 of step through-hole 4, set up sealing washer 7 between step through-hole 4 and screening glass 6, can dismantle connect in cylinder body 1 and restriction screening glass 6 break away from step through-hole 4 can dismantle end cap 8. The inner wall of the step through hole 4 is provided with a step structure, namely the aperture of one end, positioned on the inner wall of the cylinder body 1, of the step through hole 4 is smaller than the aperture of the end face, positioned on the cylinder body 1, of the step through hole, the end face, abutted against by the sealing ring 7, in the step through hole 4 is a sealing face 5 of the step through hole, and the sealing ring 7 is positioned between the protection plate 6 and the sealing face. In this embodiment, sealing washer 7 is O type circle, can dismantle end cap 8 and step through-hole 4 and can dismantle the connection, select in this embodiment to use threaded connection, and can dismantle 8 tip of end cap and contradict in protection sheet 6 and inject the position of protection sheet 6. The detachable plug 8 is provided with a vent hole 9.

In the use process, the detachable plug 8 abuts against the protection plate 6, namely, one end edge of the protection plate 6 facing the inner cavity of the cylinder body 1 abuts against and presses the sealing ring 7 to realize the sealing effect, and the other end edge abuts against the detachable plug 8, so that the aim of fixing the protection plate 6 and sealing the inner cavity of the cylinder body 1 is ensured; when 1 inner chamber pressure of cylinder body is too big (excessive pressure), because only border position of protection sheet 6 is contradicted in dismantling

end cap

8, 6 surface of protection sheet is pressed after towards the crooked deformation of 9 directions of air vent, and then lead to 6 borders of protection sheet to produce the displacement change and produce the space for sealing washer 7, the gas of excessive pressure enters into main to air vent 9 and discharges through this space position in the cylinder body 1, thereby perhaps protection sheet 6 produces the damage and supplies the gaseous discharge of excessive pressure, realize the overvoltage protection, if need reuse, only need change protection sheet 6.

In this embodiment, can dismantle end cap 8 and offer the deformation chamber 10 that supplies protection piece deformation towards the one end of protection piece, deformation chamber 10 and air vent 9 intercommunication. The aperture of air vent 9 is less than the diameter of newly-changed chamber 10, can effectively avoid the screening sheet 6 after deformation or rupture to discharge from air vent 9 position, plays the safety protection effect, in addition through deformation chamber 10, makes things convenient for screening sheet 6 to produce deformation.

When the nitrogen spring of the embodiment is used, the nitrogen spring is generally arranged on a corresponding die structure, and the lower end surface of the cylinder body 1 possibly has certain air tightness so as to facilitate the discharge of overpressure gas in the cylinder body 1. Can dismantle and leave the clearance between the one end that end cap 8 deviates from step through-hole 4 and the 1 lower terminal surface of cylinder body to the terminal surface is seted up under the cylinder body 1 and is supplied the interior gas outgoing's of air vent 9 groove 11 that loses heart, and it can be the arc to release gas groove 11, release gas groove 11 one end and step through-hole 4 intercommunication, the other end with 1 lateral wall of cylinder body intercommunication realizes 1 lateral wall of cylinder body position promptly and communicates with air vent 9 through releasing gas groove 11. After 1 inner chamber excessive pressure of cylinder body, protection sheet 6 produces deformation and makes the gaseous effluvium in the cylinder body 1, and this gas is discharged from 1 lateral wall position of cylinder body after air vent 9, disappointing groove 11 in proper order, through letting out gas groove 11, conveniently discharges the gas of excessive pressure.

Example 2, an overpressure over-stroke protection nitrogen spring, as shown in fig. 6 to 11, has the structure of the overpressure protection nitrogen spring described in example 1 or 2. In this embodiment, the end of the protection sheet 6 away from the plug is defined as an inner end surface 15, the inner end surface is welded or bonded with a ball or a cylinder 12 for the end of the piston rod 2 to collide and deform the protection sheet 6, a gap for the gas in the cylinder 1 to contact the protection sheet 6 is left between the ball or the cylinder 12 and the inner wall of the step through hole 4, the ball or the cylinder 12 is located at the center of the step through hole 4, and the end surface of the protection sheet 6 is provided with the ball or the cylinder 12 and then named as a bump 14.

In this embodiment, the end of the sphere or cylinder 12 away from the protective sheet 6 extends to the inner cavity of the cylinder 1. In the normal stroke range of the nitrogen spring, the piston rod 2 is not contacted with the sphere or the cylinder 12 after being compressed, when the piston rod 2 is compressed and moved in the stroke, the end part of the piston rod 2 is abutted against and drives the sphere or the cylinder 12 to move downwards, and the protection plate 6 is driven to deform through the sphere or the cylinder 12, so that a gap is formed between the protection plate 6 and the sealing ring 7, and the air leakage effect is achieved; in addition, because a gap for the gas in the cylinder body 1 to contact the protection sheet 6 is reserved between the inner wall of the sphere or the cylinder body 12 and the inner wall of the abutting part 5, when the inner cavity of the cylinder body 1 is over-pressurized and the piston rod 2 is not in contact with the sphere or the cylinder body 12, the protection sheet 6 is under the pressure of the over-pressurized gas and deforms, and then a gap is formed between the protection sheet 6 and the sealing ring 7 for the over-pressurized gas to be discharged, so that the over-pressure stroke protection is.

The sphere or the column 12 can be adhered to the protection sheet 6 by adhesive or fixed to the protection sheet 6 by welding, that is, when the sphere or the column 12 is fixed to the protection sheet 6, an adhesive or a soldering structure 15 is formed between the sphere or the column 12 and the protection sheet 6, and the sphere or the column 12 and the protection sheet 6 can be conveniently processed by the above connection method. In addition, when the ball or column 12 is embodied as a column, the ball or column 12 can be integrally formed with the protection sheet 6, i.e., the protection sheet 6 and the ball or column 12 are machined by a lathe, which can ensure that the ball or column 12 is located at the center of the protection sheet 6.

Example 3: a protective sheet 6 is applied to the overpressure protection nitrogen spring described in

embodiment

1 or 2, or to the overpressure overtravel protection nitrogen spring in embodiment 3, in which the protective sheet 6 is planar.

In this embodiment, in order to ensure that the pressure in the cylinder body 1 of the nitrogen spring exceeds the rated range, the protection sheet 6 deforms and loses air, so that the thickness of the protection sheet 6 needs to be accurately controlled, and when the thickness of the protection sheet 6 is determined, a plurality of accurate tests need to be performed, so as to achieve the purpose of definitely selecting the thickness of the protection sheet 6. Alternatively, the thickness of the protective sheet 6 may be determined by calculation,

the calculation method is as follows: f1 × D × L × P × S.

Wherein F1: allowable stress of the material; d: the diameter of the protective sheet 6; l: the thickness of the protective sheet 6; p: the maximum pressure of the gas in the spring; s: the area of the circle of the protective sheet 6.

When the protective sheet 6 is formulated, the thickness range value of the protective sheet 6 is calculated by the formula, and then the protective sheets 6 with a plurality of thicknesses within the thickness range value are selected for testing; by achieving a thickness of the selected protective sheet 6, a convenient thickness selection of the protective sheet 6 has been achieved.

Example 4, compared with example 4, further setting: as shown in fig. 12 to 18, a plurality of deformation grooves 13 are provided on the surface of the protection sheet 6 facing away from the seal ring 7, the deformation grooves 13 may be one or more, and the deformation grooves 13 may be linear, annular, and the cross section of the deformation grooves 13 may be rectangular or arc-shaped. When deformation groove 13 is the annular, deformation groove 13 annular center sets up with protection plate 6 is concentric, and when deformation groove 13 was straight line or curvilinear figure, deformation groove 13 used protection plate 6 centre of a circle as the center and is the distribution of radialism form, makes things convenient for protection plate 6 to produce deformation or break in deformation groove 13 position through foretell deformation groove 13.

In the present embodiment, the material of the protective sheet 6 may be steel, copper, or an aluminum alloy, and the allowable stress stability of the material used for the protective sheet 6 is ensured.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. The utility model provides an overvoltage protection nitrogen spring, includes cylinder body (1), piston rod (2), bush (3), its characterized in that: the cylinder body (1) is provided with a step through hole (4), the cylinder body is provided with a safety protection device corresponding to the step through hole (4),

safety arrangement closes including the lid protection piece (6) of step through-hole (4), locate sealing washer (7) between step through-hole (4) and protection piece (6), can dismantle connect in cylinder body (1) and restriction protection piece (6) break away from detachable end cap (8) of step through-hole (4), just air vent (9) have been seted up in detachable end cap (8).

2. An overpressure protection nitrogen spring as set forth in claim 1 wherein: the end face, which is abutted by the sealing ring (7), in the step through hole (4) is a step through hole sealing face (5), and the sealing ring (7) is positioned between the protection plate (6) and the step through hole sealing face (5).

3. An overpressure protection nitrogen spring as set forth in claim 2 wherein: can dismantle end cap (8) and offer deformation chamber (10) that supply protection sheet (6) deformation towards the one end of protection sheet (6), deformation chamber (10) and air vent (9) intercommunication.

4. An overpressure protection nitrogen spring as set forth in claim 3 wherein: cylinder body (1) lower terminal surface is seted up and is supplied interior gas outgoing's of air vent (9) groove (11) of leaking gas, and groove (11) one end and step through-hole (4) intercommunication leak gas, the other end with cylinder body (1) lateral wall intercommunication, screening glass warp or break during the excessive pressure, and cylinder body intracavity gas is in proper order through step through-hole (4), deformation cavity (10), air vent (9), by the groove (11) of leaking gas discharge.

5. The utility model provides an excessive pressure stroke protection nitrogen gas spring which characterized in that: the overpressure protection nitrogen spring as claimed in any one of claims 1 to 4, wherein a ball or a cylinder (12) is bonded or welded on an inner end face (15) of the protection plate (6) to form a bump (14), the bump (14) is used for the end of the piston rod (2) to abut against and deform the protection plate (6), the protection plate is deformed or broken when the overpressure overtravel occurs, and gas in the cylinder cavity sequentially passes through the step through hole (4), the deformation chamber (10) and the vent hole (9) and is discharged from the gas discharge groove (11).

6. The over-pressure over-travel protection nitrogen spring of claim 5, wherein: the convex block (14) is formed by integrating a protective sheet (6) and a column body (12), and a ball body or the column body (12) at the upper end of the convex block (14) is positioned at the center of the step through hole (4).

7. A protective sheet characterized by: the overpressure protection nitrogen spring applied to any one of claims 1 to 4 or the overpressure over-travel protection nitrogen spring applied to any one of claims 5 to 6.

8. The protective sheet of claim 7, wherein: the protection sheet (6) is made of steel, copper or aluminum alloy.

9. The protective sheet of claim 7, wherein: the protection plate (6) is plane-shaped, or a plurality of deformation grooves (13) which are convenient for the protection plate (6) to deform or break are formed in one end face of the protection plate (6).

10. The protective sheet of claim 8, wherein: the deformation grooves (13) are linear or annular, and when the deformation grooves (13) are linear, the deformation grooves (13) are arranged in a radial mode. The bottom of the deformation groove (13) can be V-shaped, U-shaped or rectangular.