High-elasticity nitrogen spring

Abstract

The utility model relates to the field of nitrogen springs, in particular to a high-elasticity nitrogen spring which comprises a cylinder body, a piston rod, a sealing cover and a compression sleeve, the compression sleeve is fixedly arranged on the inner wall face of the cylinder body, a guide hole is formed in the upper end of the cylinder body in a penetrating mode, a bottom hole is formed in the lower end of the cylinder body in a penetrating mode, and the piston rod is arranged in the guide hole in a sliding mode. The piston rod is further in contact with the inner wall of the compression sleeve, and the sealing cover is fixedly arranged at the bottom hole. Through the arrangement of the compression sleeve, the second guide ring on the piston rod is not rubbed with the inner wall of the sleeve but rubbed with the compression sleeve, so that the process requirement on the inner wall of the sleeve is reduced, only the roughness of the inner wall of the compression sleeve is required to meet the requirement, the machining difficulty of the sleeve is greatly reduced, and the product stability is improved; according to the utility model, the U-shaped ring is arranged on the contact section by arranging the mounting step, so that the volume of more gas in the cylinder body can be reduced under the same stroke, and larger elastic force can be obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen spring field especially relates to a high elastic nitrogen spring. BACKGROUND

[0002] Nitrogen spring (or nitrogen cylinder or nitrogen cylinder) is a new type of elastic component with high pressure nitrogen as working medium, which has the advantages of small volume, large elastic force, long stroke, stable work, precise manufacturing, long service life (generally up to one million times of extension and contraction), flat elastic curve and no need of pre-tightening, etc. It is applied to die (especially automobile stamping die) to complete the work that metal spring, rubber and air cushion and other conventional elastic components are difficult to complete, effectively simplify the design and manufacturing of die, facilitate the installation and adjustment of die, prolong the service life of die and ensure the stability of product quality.

[0003] The existing nitrogen spring mainly includes cylinder body, piston rod, bushing and sealing element. The inner wall of the cylinder body is processed by internal circular grinding, which has large difficulty coefficient and unstable roughness, which can easily cause high temperature and serious wear of the sealing element, thereby reducing the service life of the nitrogen spring. Therefore, it is necessary to improve such a structure to overcome the above-mentioned defects. SUMMARY

[0004] The utility model discloses a high elastic nitrogen spring which overcomes the defects of the prior art.

[0005] The utility model discloses a high elastic nitrogen spring which overcomes the defects of the prior art.

[0006] In the above technical scheme, the cylinder body is used to determine the position of the remaining components, the piston rod is moved up and down by cooperating with the cylinder body, and the cover is used to close the cylinder body. The setting of the compression sleeve makes the piston rod rub against the inner wall of the compression sleeve instead of the inner wall of the cylinder body, so that the cylinder body does not need to be processed by internal circular grinding, and the processing requirement of the cylinder body is reduced.

[0007] The utility model further provides that the roughness of the inner wall surface of the compression sleeve is not greater than Ra0.1.

[0008] In the above technical scheme, the roughness of the inner wall of the compression sleeve is not greater than Ra0.1 to reduce the friction force, thereby reducing the wear and improving the service life of the compression sleeve and the piston rod.

[0009] The further setting of the utility model discloses: the compression cover is detachably fixed and arranged on the inner wall surface of the cylinder body.

[0010] In the above technical solution: the compression cover is detachably arranged, so that after long -term use causes the compression cover wear, can directly replace the compression cover

[0011] The further setting of the utility model discloses: the piston rod includes the guide section and the contact section, the guide section and the contact section coaxially fixed connection.

[0012] In the above technical solution: the guide section is used for realizing the direction of the contact section, so that the piston rod can compress the air in the cylinder body.

[0013] The further setting of the utility model discloses: the cover is provided with the air hole, and the air valve core is fixedly arranged in the air hole.

[0014] In the above technical solution: the air hole is used for setting the air valve core, and the air valve core is used for filling the cylinder or supplying the cylinder exhaust.

[0015] The further setting of the utility model discloses: the guide hole is provided with the first placing groove and the second placing groove, the dustproof ring is arranged in the first placing groove, and the first guide ring is arranged in the second placing groove.

[0016] In the above technical solution: the first placing groove is used for setting the dustproof ring, and the dustproof ring is used for avoiding dust into the guide hole and rubbing with the guide section, and the second placing groove is used for setting the first guide ring, and the first guide ring is used for contacting the guide section, reducing the contact area of the guide section, thereby reducing the friction.

[0017] The further setting of the utility model discloses: the contact section is provided with the third placing groove and the installation step, the second guide ring is arranged in the third placing groove, and the U-shaped ring is sleeved on the installation step.

[0018] In the above technical solution: the third placing groove is used for setting the second guide ring, and the second guide ring is used for contacting the compression cover to reduce the area of contact and reduce the friction, and the installation step is used for setting the U-shaped ring, and the U-shaped ring is used for improving the air tightness.

[0019] The further setting of the utility model discloses: the diameter of the guide section is consistent with the diameter of the first guide ring, and the guide section and the first guide ring are slidably connected, the diameter of the second guide ring is consistent with the inner diameter of the compression cover, and the second guide ring and the compression cover are slidably connected.

[0020] In the technical scheme, the diameter of the guide section is consistent with the diameter of the first guide ring, so as to ensure the air tightness of the cylinder body; the guide section is in sliding connection with the first guide ring, so as to determine the sliding direction of the piston rod; and the diameter of the second guide ring is consistent with the inner diameter of the compression sleeve, so that the gas in the cylinder body can be compressed when the piston rod moves downward.

[0021] The utility model discloses a high elasticity type nitrogen spring compares with prior art:

[0022] 1. The utility model discloses a compression sleeve is set up, make the second guide ring on the piston rod not rub with sleeve inner wall, but rub with compression sleeve, thereby make the process requirement of sleeve inner wall reduce, only require that the inner wall roughness of compression sleeve compound requirement can, thereby greatly reduced the processing difficulty of sleeve, improved product stability.

[0023] 2. The utility model discloses still set up installation step, make U type ring set up on the contact section, make under the same stroke, can reduce more cylinder body gas volume, thereby obtain greater elasticity. DRAWINGS

[0024] Figure 1 It is the cross section schematic view of the utility model;

[0025] Figure 2 It is the schematic view of the piston rod of the utility model;

[0026] Figure 3 It is the cross section schematic view of the cylinder body of the utility model.

[0027] The corresponding component name that the figure number and letter indicate: 10-cylinder body;101-guide hole;102-bottom hole;103-first placing groove;104-second placing groove;20-piston rod;201-guide section;202-contact section;202a-third placing groove;202b-installation step;30-closure;301-air hole;40-compression sleeve;50-valve core;60-dustproof ring;70-first guide ring;80-second guide ring;90-U type ring. DETAILED DESCRIPTION

[0028] The embodiment of the utility model is explained in detail below, and the embodiment is implemented on the premise of the technical scheme of the utility model, and detailed implementation mode and specific operation process are given, but the protection scope of the utility model is not limited to the following embodiment.

[0029] For example, Figures 1-2The utility model provides a high elasticity type nitrogen gas spring, including cylinder body 10, piston rod 20, cover 30 and compression sleeve 40, compression sleeve 40 fixedly arranged on the inner wall surface of cylinder body 10, the through arrangement of guide hole 101 is to the upper end of cylinder body 10, the through arrangement of bottom hole 102 is to the lower end of cylinder body 10, piston rod 20 is slidably arranged in guide hole 101, and piston rod 20 still keeps contact with the inner wall of compression sleeve 40, cover 30 is fixedly arranged at bottom hole 102, wherein the inside of cylinder body 10 is cavity, guide hole 101 and bottom hole 102 are connected to the cavity, first annular groove and second annular groove are still arranged on the inner wall of cylinder body 10, first O type ring is arranged in first annular groove, first O type ring is in contact with the outer wall surface of compression sleeve 40 to avoid compression sleeve 40 displacement, second O type ring is arranged in second annular groove, second O type ring is in contact with cover 30 to improve the sealing property, the outer thread is set up on cover 30, bottom hole 102 is provided with internal thread, and cover 30 is connected with bottom hole 102 by screw thread.

[0030] As Figures 1-2 The utility model provides a high elasticity type nitrogen gas spring, the roughness of the inner wall surface of compression sleeve 40 is not more than Ra0.1, wherein the hardness of cylinder body 10 should be between HB245 to HB285, the hardness of cover 30 should be between HB245 to HB285, and the hardness of piston rod 20 should be greater than HV600.

[0031] As Figures 1-2 The utility model provides a high elasticity type nitrogen gas spring, compression sleeve 40 is detachably fixedly arranged on the inner wall surface of cylinder body 10.

[0032] As Figures 1-2 The utility model provides a high elasticity type nitrogen gas spring, piston rod 20 includes guide section 201 and contact section 202, guide section 201 and contact section 202 coaxially fixed connection, wherein the diameter of guide section 201 is less than the diameter of contact section 202.

[0033] As Figures 1-2 The utility model provides a high elasticity type nitrogen gas spring, cover 30 is provided with air hole 301, and air valve core 50 is fixedly arranged in air hole 301, wherein the diameter of air hole 301 corresponds with the outer diameter of air valve core 50.

[0034] As Figures 1-2As shown in the utility model discloses a high elasticity type nitrogen gas spring, the first placing groove 103 and the second placing groove 104 are arranged at the interval in the guide hole 101, the dustproof ring 60 is arranged in the first placing groove 103, the first guide ring 70 is arranged in the second placing groove 104. Among them, the shape of first placing groove 103 with the dustproof ring 60 corresponds with the width of the second placing groove 104 with the height of the first guide ring 70 is consistent.

[0035] As Figures 1-2 The utility model discloses a high elasticity type nitrogen gas spring, be provided with third placing groove 202a and installation step 202b on the contact section 202, second guide ring 80 is arranged in third placing groove 202a, and U type ring 90 is set up on installation step 202b. Among them, the width of third placing groove 202a with the height of second guide ring 80 is consistent, and the gasket is also set up on installation step 202b, one side of gasket with the bottom contact of installation step 202b, and the other side with U type ring 90 contact.

[0036] As Figures 1-2 The utility model discloses a high elasticity type nitrogen gas spring, the diameter of the guide section 201 with the diameter of the first guide ring 70 is consistent, and the guide section 201 with the first guide ring 70 sliding connection, the diameter of the second guide ring 80 with the inner diameter of the compression sleeve 40 is consistent, and the second guide ring 80 with the compression sleeve 40 sliding connection.

[0037] The working principle of the utility model is:

[0038] a) when the piston rod is pressed;

[0039] b) the piston rod moves downward;

[0040] c) due to the setting of U type ring, the cylinder keeps sealing;

[0041] d) the piston rod moves downward and makes the air in the cylinder be compressed;

[0042] e) the air pressure in the cylinder rises;

[0043] f) after the piston rod is not pressed;

[0044] g) the piston rod is pushed by the gas in the cylinder;

[0045] h) the piston rod moves upward;

[0046] i) can be filled with gas or exhaust through the valve core to change the initial air pressure in the cylinder, to change the pressure lower limit that the piston rod can descend.

[0047] The above merely illustrates a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

[0048] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises... a" does not, without more constraints, exclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element.

Claims

1. A high-elasticity nitrogen spring, characterized in that: The device includes a cylinder body (10), a piston rod (20), a cover (30), and a compression sleeve (40). The compression sleeve (40) is fixedly disposed on the inner wall surface of the cylinder body (10). A guide hole (101) is provided through the upper end of the cylinder body (10), and a bottom hole (102) is provided through the lower end of the cylinder body (10). The piston rod (20) is slidably disposed in the guide hole (101), and the piston rod (20) is also in contact with the inner wall of the compression sleeve (40). The cover (30) is fixedly disposed at the bottom hole (102).

2. The high-elasticity nitrogen spring according to claim 1, characterized in that: The roughness of the inner wall surface of the compression sleeve (40) is no greater than Ra0.

1.

3. A high-elasticity nitrogen spring according to claim 2, characterized in that: The compression sleeve (40) is detachably fixed on the inner wall surface of the cylinder (10).

4. A high-elasticity nitrogen spring according to claim 3, characterized in that: The piston rod (20) includes a guide section (201) and a contact section (202), wherein the guide section (201) and the contact section (202) are coaxially fixedly connected.

5. A high-elasticity nitrogen spring according to claim 4, characterized in that: The cover (30) is provided with an air hole (301), and a valve core (50) is fixedly installed inside the air hole (301).

6. A high-elasticity nitrogen spring according to claim 4 or 5, characterized in that: The guide hole (101) is provided with a first placement groove (103) and a second placement groove (104) at intervals. A dustproof ring (60) is provided in the first placement groove (103) and a first guide ring (70) is provided in the second placement groove (104).

7. A high-elasticity nitrogen spring according to claim 6, characterized in that: The contact section (202) is provided with a third placement groove (202a) and an installation step (202b). A second guide ring (80) is provided in the third placement groove (202a), and a U-shaped ring (90) is fitted on the installation step (202b).

8. A high-elasticity nitrogen spring according to claim 7, characterized in that: The diameter of the guide segment (201) is the same as the diameter of the first guide ring (70), and the guide segment (201) is slidably connected to the first guide ring (70). The diameter of the second guide ring (80) is the same as the inner diameter of the compression sleeve (40), and the second guide ring (80) is slidably connected to the compression sleeve (40).

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