CN210565956U - Slow return nitrogen spring - Google Patents
Slow return nitrogen spring Download PDFInfo
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- CN210565956U CN210565956U CN201920875716.4U CN201920875716U CN210565956U CN 210565956 U CN210565956 U CN 210565956U CN 201920875716 U CN201920875716 U CN 201920875716U CN 210565956 U CN210565956 U CN 210565956U
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Abstract
The utility model discloses a slow return nitrogen spring, which comprises a cylinder body, a bushing and a piston rod, wherein an outer sealing ring is arranged between the cylinder body and the bushing, a retaining ring and an inner sealing ring are arranged between the bushing and the piston rod, the bottom of the cylinder body is provided with an inflation interface communicated with the interior of the cylinder body, and the top of the cylinder body is provided with a dust cover; the piston rod is characterized in that a piston ring is formed at the bottom of the piston rod, a piston sealing ring is arranged between the outer side wall of the piston ring and the inner wall of the cylinder body, an upper air storage chamber and a lower air storage chamber are respectively formed on the upper side and the lower side of the piston ring, a one-way valve and a flow control valve are arranged in the piston ring, the one-way valve is used for realizing one-way communication between the lower air storage chamber and the upper air storage chamber, and the flow control valve can realize two-way communication between the upper air storage chamber and the. The remarkable effects are as follows: the work of the press is reduced, the service life of the spring is prolonged, the use cost of customers is reduced, and the maintenance cost is reduced.
Description
Technical Field
The utility model relates to nitrogen spring technical field, concretely relates to slow return stroke nitrogen spring.
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, however, in the structural design of the existing nitrogen spring, a piston rod is related to acting force exerted on the piston rod during return stroke, the piston rod cannot be separated from the exerted acting force to slowly return stroke, the piston rod cannot be used on certain dies with buffering requirements, and the working power of a press can be increased instead, and the pressure of the spring is overcome to do work.
Disclosure of Invention
The utility model aims at providing a slow return stroke nitrogen spring can reduce the press work, also can make the life-span of spring itself obtain the extension simultaneously, reduces customer use cost, reduces cost of maintenance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the key point of the slow return nitrogen spring is as follows: 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, a retaining ring and an inner sealing ring are arranged between the bushing and the piston rod, an inflation interface communicated with the interior of the cylinder body is arranged at the bottom of the cylinder body, a dust cover is arranged at the top of the cylinder body, the peripheral edge of the dust cover extends outwards and then bends downwards to form a bent part, and the bent part is sleeved on the cylinder body; the piston rod is characterized in that a piston ring is formed at the bottom of the piston rod, a piston sealing ring is arranged between the outer side wall of the piston ring and the inner wall of the cylinder body, an upper air storage chamber and a lower air storage chamber are respectively formed on the upper side and the lower side of the piston ring, a one-way valve and a flow control valve are arranged in the piston ring, the one-way valve is used for realizing one-way communication between the lower air storage chamber and the upper air storage chamber, and the flow control valve can realize two-way communication between the upper air storage chamber and the.
Furthermore, a bulge is formed downwards on the inner wall of the dust cover and is in lock joint fit with the bushing.
Further, the bush comprises a bush body, a sealing ring mounting groove and a deformation groove are respectively formed in the outer wall of the bush body, the sealing ring mounting groove is located below the deformation groove, a safety ring is formed between the sealing ring mounting groove and the deformation groove, and the outer diameter of the safety ring is consistent with that of the bush.
Furthermore, the deformation groove is composed of a right-angle groove section and an arc-surface groove section, the right-angle groove section and the arc-surface groove section are in smooth transition, and the right-angle groove section is located below the arc-surface groove section and is close to the safety ring.
Further, the width of the right-angle groove section is greater than that of the arc-surface groove section, the width of the sealing ring mounting groove is less than that of the deformation groove, and the depth of the sealing ring mounting groove is greater than that of the deformation groove.
Furthermore, an inner concave section, a conical surface section and an arc transition section which are connected in sequence are formed between the piston rod and the piston ring, the lower end of the inner concave section is connected with the piston ring, a groove is formed between the conical surface section and the piston ring by the inner concave section, the diameter of the conical surface section is gradually reduced from bottom to top, the diameter of the lower end of the conical surface 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 rod.
Furthermore, a limiting groove is formed in the inner side wall of the cylinder body, a steel wire clamping ring is arranged in the limiting groove, and the bushing is fixed in the cylinder body in a limiting mode through the steel wire clamping ring.
In the process of pressing down the die, the piston rod moves downwards, the gas in the lower gas storage chamber enters the upper gas storage chamber through the one-way valve and the flow control valve, the gas in the whole gas storage chamber is compressed, the gas pressure is increased, and the pressure of the piston rod is increased until the nitrogen spring is compressed to the set position of the die;
in the return process of the mold, the mold leaves a nitrogen spring, and because the upper air storage chamber and the lower air storage chamber are communicated in a two-way mode through the flow control valve, the air pressure of the upper air storage chamber and the air pressure of the lower air storage chamber are the same, but because the stress areas of the two end faces of the piston ring are different, the area of the lower end is larger than that of the upper end, the upward pressure of the piston rod is larger than that of the lower end, and the piston rod moves upwards;
the deformation groove is formed in the bushing to form the safety ring, when the pressure in the cylinder body exceeds a threshold value, the safety ring is deformed, the outer sealing ring is pulled to be cracked and enters the C-shaped groove in the middle of the cylinder body, the outer sealing ring is deformed or torn due to the fact that the contact space is enlarged, the outer sealing ring loses the sealing effect, and high-pressure media in the cylinder body are released to achieve pressure relief, so that the risk of cylinder explosion is avoided, further damage is cut off, and equipment is protected; meanwhile, the later maintenance of the nitrogen spring can be facilitated, and when the nitrogen spring is damaged due to overpressure, the nitrogen spring can be recovered to be used by replacing the lining;
the connecting part between the piston rod and the piston ring is set to be an inner concave section, a conical section and an arc transition section, and a groove structure is formed at the inner concave section, so that the inner concave section is used as a guided fracture point by utilizing the difference between the metal shearing resistance and the tensile resistance, when the piston rod is fractured, the fracture surface is contacted with an inner sealing ring to break the sealing effect of the inner sealing ring to cause sealing failure, the air pressure in the cylinder body is leaked until the air pressure is zero, and the piston rod is always fixed in the cylinder body after the piston ring is fractured due to the fact that the diameter of the conical section above the inner concave section is larger than the diameter of the piston rod and larger than the caliber of a;
the utility model discloses a show the effect and be:
1. the slow return nitrogen spring can solve the negative influence of a common nitrogen spring on a part stamped by a die in a specific environment, and improve the conditions of poor product forming, structural deformation and the like;
2. the stroke of one period of actual use of the slow return nitrogen spring in use is smaller than that of one period of use of a conventional nitrogen spring, and compared with the nitrogen spring with the same size, the heat productivity is reduced, so that the service life is prolonged, and the maintenance cost, the operation cost, the replacement cost and the like of the die are reduced.
3. The working power of the press is reduced, the electric energy is saved, and the press is green and environment-friendly.
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 an enlarged partial schematic view of A in FIG. 2;
FIG. 4 is a schematic view of the bushing of the present invention;
fig. 5 is a schematic structural view of the piston rod;
fig. 6 is a partially enlarged schematic view of B in fig. 5.
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 to 6, a slow return nitrogen spring includes a cylinder body 1, a bushing 2 fixed in the cylinder body, and a piston rod 3 installed in the bushing 2 in a limited manner, wherein a limiting groove 4 is formed in an inner side wall of the cylinder body 1, a steel wire snap ring 5 is arranged in the limiting groove 4, the bushing 2 is fixed in the cylinder body 1 in a limited manner through the steel wire snap ring 5, an outer sealing ring 6 is arranged between the cylinder body 1 and the bushing 2, a retaining ring 7 and an inner sealing ring 8 are arranged between the bushing 2 and the piston rod 3, an inflation port 9 communicated with the inside of the cylinder body 1 is formed in the bottom of the cylinder body 1, a dust cover 10 is arranged at the top of the cylinder body 1, a peripheral edge of the dust cover 10 extends outwards and then is bent downwards to form a bent portion 10a, and the bent portion 10a is sleeved on the cylinder; the piston rod 3 is provided with a piston ring 11 at the bottom, a piston seal ring 12 is arranged between the outer side wall of the piston ring 11 and the inner wall of the cylinder 1, an upper air storage chamber 13 and a lower air storage chamber 14 are respectively formed at the upper side and the lower side of the piston ring 11, a check valve 15 and a flow control valve 16 are arranged in the piston ring 11, the check valve 15 is used for realizing one-way communication between the lower air storage chamber 14 and the upper air storage chamber 13, and the flow control valve 16 can realize two-way communication between the upper air storage chamber 13 and the lower air storage chamber 14.
As shown in fig. 3, a protrusion 10b is formed downward on an inner wall of the dust cover 10, the protrusion 10b is in lock joint with the bushing 2, specifically, a groove is formed between the bending portion 10a and the protrusion 10b, the port portion of the cylinder body 1 is clamped in the groove, a snap ring 10c is formed on an axial inner wall of the protrusion 10b, correspondingly, a snap groove is formed on the bushing 2, and the snap joint between the dust cover 10 and the bushing 2 is fixed by the cooperation of the snap ring 10c and the snap groove. In this example, the dust cover 10 protects the port of the cylinder 1 in all directions, so that compared with the conventional dust cover 10, dust, oil dirt and the like can be prevented from entering the cylinder 1 from the gap between the cylinder 1 and the dust cover 10, and the dust-proof effect is greatly improved.
Referring to fig. 4, the liner 2 includes a liner body 21, a seal ring installation groove 22 and a second deformation groove 23 are respectively formed on an outer wall of the liner body 21, the seal ring installation groove 22 is located below the second deformation groove 23, a safety ring 24 is formed between the seal ring installation groove 22 and the second deformation groove 23, and the safety ring 24 is consistent with an outer diameter of the liner, specifically: the second deformation groove 23 is composed of a right-angle groove section 23a and an arc-surface groove section 23b, the right-angle groove section 23a and the arc-surface groove section 23b are in smooth transition, the right-angle groove section 23a is located below the arc-surface groove section 23b and is arranged close to the safety ring 24, and the design of the arc-surface groove end 23b cannot be replaced by other right-angle designs, so that more stable compression stress can be provided, the compression capacity is increased, and the stability of the whole bushing is improved. Specifically, the method comprises the following steps:
the width of the right-angle groove section 23a is greater than that of the arc-surface groove section 23b, the width of the sealing ring mounting groove 22 is less than that of the second deformation groove 23, and the depth of the sealing ring mounting groove 22 is greater than that of the second deformation groove 23.
In this embodiment, the width of the right-angle groove section 23a is 2mm, the radius of the circle where the arc-shaped groove section 23b is located is 1.5mm, and the width of the safety ring 24 is 1 mm.
In specific practical process, through seting up second deformation groove 23 at bush 2 and forming safety ring 24 between sealing washer mounting groove 22 and second deformation groove 23, when cylinder body 1 internal pressure exceeded the threshold value, make safety ring 24 take place to deform, in drawing outer seal ring 6 and getting into cylinder body middle part C type groove, because the contact space grow, outer seal ring 6 warp or tear so that outer seal ring 6 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.
As shown in fig. 5 and 6, an inner concave section 3a, a conical section 3b and an arc transition section 3c are formed between the piston rod 3 and the piston ring 11, the inner concave section 3a, the conical section 3b and the piston ring 11 are connected in sequence, the inner concave section 3a forms a groove between the conical section 3b and the piston ring 11, the conical section 3b has a diameter gradually decreasing from bottom to top, the diameter of the lower end of the conical section 3b is larger than that of the piston rod 3, the diameter of the lower end of the conical section 3b is larger than that of the upper safety opening of the liner 2, and the upper end of the arc transition section 3c is connected with the lower end of the piston rod 3.
In this embodiment, preferably, the difference between the diameters of the lower end and the upper end of the conical section 3b is 0.5mm, the radius of the circle on which the surface of the concave section 3a is located is 0.5mm, and the radius of the circle on which the surface of the arc-shaped transition section 3c is located is 1.5 mm.
In the embodiment, the connection part between the piston rod 3 and the piston ring 7 is set as the concave section 3a, the conical section 3b and the arc transition section 3c, and a groove is formed in the concave section 3a, so that the difference between the metal shearing resistance and the stretching resistance is utilized to set the concave section 3a as a guide breaking point, the diameter of the conical section 3b above the concave section 3a is larger than the diameter of the piston rod 3 and larger than the caliber of the safety opening on the bush 2, when the piston ring 11 is broken, the piston rod 3 can still continuously move upwards under the action of high-pressure nitrogen until the broken surface is contacted with the inner sealing ring 8, the sealing effect of the inner sealing ring 8 is damaged to cause sealing failure, the air pressure inside the cylinder body 1 leaks into an air leakage state, at the moment, the piston rod 3 can continuously move upwards to be contacted with the safety opening on the bush 2, the broken opening at the bottom of the piston rod, until the internal air pressure is zero, but the diameter of the upper safety opening is smaller than the fracture surface end of the piston rod 3, so that the piston rod 3 is always fixed in the cylinder body 1 after the piston ring 11 is fractured, and the safety protection effect is achieved.
In the process of pressing down the mould, the piston rod 3 moves downwards, the air in the lower air storage chamber 14 enters the upper air storage chamber 13 through the one-way valve 15 and the flow control valve 16, the air in the whole air storage chamber is compressed, the air pressure is increased, the pressure of the piston rod 3 is increased until the nitrogen spring is compressed to the set position of the mould;
in the return process of the mold, the mold leaves the nitrogen spring, the upper air storage chamber 13 and the lower air storage chamber 14 are communicated in a two-way mode through the flow control valve 16, so that the air pressure of the upper air storage chamber 13 and the air pressure of the lower air storage chamber 14 are the same, but the stress areas of the two end faces of the piston ring 11 are different, the area of the lower end is larger than that of the upper end, so that the upward pressure of the piston rod 3 is larger than that of the lower end, and the piston rod 3 moves upward.
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 (7)
1. A slow return nitrogen spring is 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, a retaining ring and an inner sealing ring are arranged between the bushing and the piston rod, an inflation interface communicated with the interior of the cylinder body is arranged at the bottom of the cylinder body, a dust cover is arranged at the top of the cylinder body, the peripheral edge of the dust cover extends outwards and then bends downwards to form a bent part, and the bent part is sleeved on the cylinder body; the piston rod is characterized in that a piston ring is formed at the bottom of the piston rod, a piston sealing ring is arranged between the outer side wall of the piston ring and the inner wall of the cylinder body, an upper air storage chamber and a lower air storage chamber are respectively formed on the upper side and the lower side of the piston ring, a one-way valve and a flow control valve are arranged in the piston ring, the one-way valve is used for realizing one-way communication between the lower air storage chamber and the upper air storage chamber, and the flow control valve can realize two-way communication between the upper air storage chamber and the.
2. The slow-return nitrogen spring of claim 1, wherein: and a bulge is formed downwards on the inner wall of the dust cover and is in lock joint fit with the bushing.
3. The slow-return nitrogen spring of claim 1, wherein: the bushing comprises a bushing body, wherein a sealing ring mounting groove and a deformation groove are respectively formed in the outer wall of the bushing body, the sealing ring mounting groove is located below the deformation groove, a safety ring is formed between the sealing ring mounting groove and the deformation groove, and the outer diameter of the safety ring is consistent with that of the bushing.
4. The slow return nitrogen spring of claim 3, wherein: the deformation groove is composed of a right-angle groove section and an arc-surface groove section, the right-angle groove section and the arc-surface groove section are in smooth transition, and the right-angle groove section is located below the arc-surface groove section and is close to the safety ring.
5. The slow return nitrogen spring of claim 4, wherein: the width of right angle groove section is greater than the width of cambered surface groove section, the width of sealing washer mounting groove is less than the deformation groove, the degree of depth of sealing washer mounting groove is greater than the deformation groove.
6. The slow-return nitrogen spring of claim 1, wherein: an inward concave section, a conical surface section and an arc transition section which are connected in sequence are formed between the piston rod and the piston ring, the lower end of the inward concave section is connected with the piston ring, a groove is formed between the conical surface section and the piston ring by the inward concave section, the diameter of the conical surface section is gradually reduced from bottom to top, the diameter of the lower end of the conical surface 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 rod.
7. The slow-return nitrogen spring of claim 1, wherein: the inner side wall of the cylinder body is provided with a limiting groove, a steel wire clamping ring is arranged in the limiting groove, and the bushing is fixed in the cylinder body in a limiting mode through the steel wire clamping ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920875716.4U CN210565956U (en) | 2019-06-12 | 2019-06-12 | Slow return nitrogen spring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920875716.4U CN210565956U (en) | 2019-06-12 | 2019-06-12 | Slow return nitrogen spring |
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| CN210565956U true CN210565956U (en) | 2020-05-19 |
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| CN201920875716.4U Active CN210565956U (en) | 2019-06-12 | 2019-06-12 | Slow return nitrogen spring |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750020A (en) * | 2020-06-16 | 2020-10-09 | 无锡卡斯德金属科技有限公司 | High-temperature-resistant nitrogen spring |
| CN113042605A (en) * | 2021-03-05 | 2021-06-29 | 吉林大学 | Controllable nitrogen cylinder for delaying return stroke |
-
2019
- 2019-06-12 CN CN201920875716.4U patent/CN210565956U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750020A (en) * | 2020-06-16 | 2020-10-09 | 无锡卡斯德金属科技有限公司 | High-temperature-resistant nitrogen spring |
| CN113042605A (en) * | 2021-03-05 | 2021-06-29 | 吉林大学 | Controllable nitrogen cylinder for delaying return stroke |
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