Sealing structure for piston rod of air cushion cylinder body

Abstract

The utility model discloses an air cushion cylinder piston rod sealing structure in the field of piston rod sealing, which comprises a piston rod with a through hole inside, the top of the piston rod is fixedly connected with an upper top cap through a round nut, the bottom of the piston rod is fixedly connected with a piston through a round nut, the upper top cap is slidably connected with a lower cylinder, and the lower cylinder comprises an upper cavity and a lower cavity. A guide ring is arranged between the upper cavity and the lower cavity, the piston can slide up and down in the lower cavity, the piston rod is provided with an air outlet hole corresponding to the upper cavity and communicated with the through hole, the upper end of the through hole is in threaded connection with a plug, and the plug comprises a sealing part, a flange part and a clamping part; a groove is formed in the side, facing the end of the piston rod, of the flange part, a first sealing ring is arranged in the groove, sealant is filled between the sealing part and the piston rod, and the flange part makes contact with the end of the piston rod to form a pressing face. The air cushion cylinder has a stable sealing effect, air leakage can be effectively avoided, and the service life of the air cushion cylinder is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to piston rod sealing technical field, especially relates to a gas cushion cylinder piston rod sealing structure. BACKGROUND

[0002] The gas cushion cylinder is an important part of the press, and is used for top material, stretch forming, drawing and edge pressing process. The piston rod is an important moving part in the gas cushion cylinder, and the sealing structure determines the working capacity and service life of the gas cushion cylinder. The traditional piston rod sealing structure adopts the plug screw plug to block the through hole of the piston rod. When the piston rod reciprocates, the plug is often loose or the thread gap is caused due to the problems such as excessive force of the plug or thread processing, and the gas leakage often occurs, and even the sealing function cannot be achieved. CONTENT

[0003] The utility model discloses a gas cushion cylinder piston rod sealing structure, has stable sealing effect, can effectively avoid the gas leakage phenomenon, prolongs the service life of gas cushion cylinder.

[0004] The utility model discloses a gas cushion cylinder piston rod sealing structure, including the piston rod of inside set through -hole, the piston rod top is connected through round nut and upper top hat fixedly, the piston rod bottom is connected through round nut and piston fixedly, the upper top hat is connected with lower cylinder body slidingly, the lower cylinder body includes the upper cavity and lower cavity, be provided with the guide ring between the upper cavity and lower cavity, the piston can slide up and down in the lower cavity, the piston rod is provided with the gas outlet hole with through -hole intercommunication to the upper cavity, the through -hole upper end is connected with the plug, the plug includes sealing portion, flange portion and clamping portion, the sealing portion outside is provided with the thread section, the flange portion is towards the side of piston rod end and is seted up with recess, is seted up with first sealing ring in the recess, the sealing portion and piston rod between fill with sealant, the flange portion and piston rod end contact and form the compression surface.

[0005] The utility model discloses a gas cushion cylinder piston rod sealing structure, including the piston rod of inside set through -hole, the piston rod top is connected through round nut and upper top hat fixedly, the piston rod bottom is connected through round nut and piston fixedly, the upper top hat is connected with lower cylinder body slidingly, the lower cylinder body includes the upper cavity and lower cavity, be provided with the guide ring between the upper cavity and lower cavity, the piston can slide up and down in the lower cavity, the piston rod is provided with the gas outlet hole with through -hole intercommunication to the upper cavity, the through -hole upper end is connected with the plug, the plug includes sealing portion, flange portion and clamping portion, the sealing portion outside is provided with the thread section, the flange portion is towards the side of piston rod end and is seted up with recess, is seted up with first sealing ring in the recess, the sealing portion and piston rod between fill with sealant, the flange portion and piston rod end contact and form the compression surface.

[0006] As a further improvement of this utility model, the inner wall of the guide ring is provided with an installation groove and an installation step corresponding to the piston rod. A second sealing ring is provided in the installation groove. A bushing, a stator ring and a pressure plate are arranged sequentially from bottom to top in the installation step. The pressure plate is fixedly connected to the guide ring by fasteners.

[0007] As a further improvement of this utility model, multiple fixing grooves are respectively opened on the outer periphery of the piston rod corresponding to the piston and the top cap, and an O-ring is provided in the fixing groove.

[0008] As a further improvement of this utility model, a first sealing groove and a second sealing groove are provided on the outer periphery of the piston corresponding to the lower cavity. A Gladwell ring is provided in the first sealing groove, and a Y-shaped ring is provided in the second sealing groove.

[0009] As a further improvement of this utility model, a lower end cover is provided at the bottom of the lower cylinder body, and an air inlet is provided on the lower end cover corresponding to the through hole.

[0010] As a further improvement of this utility model, a buffer pad is provided on the upper side of the lower end cover corresponding to the lower side of the piston.

[0011] As a further improvement of this utility model, it also includes a circular ring pad, which covers the upper end of the piston rod and is fixedly connected to the upper cap by fasteners. Attached Figure Description

[0012] Figure 1 This is a cross-sectional view of the present invention.

[0013] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0014] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0015] Figure 4 for Figure 1 Cross-sectional view at point AA.

[0016] Figure 5 This is a side view of the plug.

[0017] Figure 6 This is a top view of the plug.

[0018] The components include: 1. Piston rod; 101. Through hole; 102. Air outlet; 103. Fixing groove; 2. Round nut; 3. Top cap; 4. Piston; 401. First sealing groove; 402. Second sealing groove; 5. Lower cylinder body; 501. Upper cavity; 502. Lower cavity; 503. Guide ring; 504. Mounting groove; 505. Mounting step; 6. Plug; 601. Sealing part; 602. Flange part; 603. Snap-fit ​​part; 7. First sealing ring; 8. Second sealing ring; 9. Bushing; 10. Sterling ring; 11. Pressure plate; 12. O-ring; 13. Glyd ring; 14. Y-ring; 15. Lower end cap; 15. Air inlet; 16. Buffer pad; 17. Circular pad block. Detailed Implementation

[0019] like Figures 1-6 As shown, a piston rod sealing structure for an air cushion cylinder includes a piston rod 1 with an internal through hole 101 and an annular gasket 17. The top of the piston rod 1 is fixedly connected to an upper cap 3 via a round nut 2, and the bottom of the piston rod 1 is fixedly connected to a piston 4 via a round nut 2. The upper cap 3 is slidably connected to a lower cylinder 5. The lower cylinder 5 includes an upper cavity 501 and a lower cavity 502. A guide ring 503 is provided between the upper cavity 501 and the lower cavity 502. The inner wall of the guide ring 503 has an installation groove 504 and an installation step corresponding to the piston rod 1. 505, a second sealing ring 8 is provided in the mounting groove 504. A bushing 9, a Sterling ring 10, and a pressure plate 11 are arranged sequentially from bottom to top in the mounting step 505. The pressure plate 11 is fixedly connected to the guide ring 503 by fasteners. The piston 4 can slide up and down in the lower cavity 502. A first sealing groove 401 and a second sealing groove 402 are opened on the outer periphery of the piston 4 corresponding to the lower cavity 502. A Gladley ring 13 is provided in the first sealing groove 401, and a Y-ring 14 is provided in the second sealing groove 402. The piston rod 1 corresponds to the upper cavity 502. A vent 102 is provided, communicating with a through hole 101. A plug 6 is threadedly connected to the upper end of the through hole 101. The plug 6 includes a sealing part 601, a flange part 602, and a snap-fit ​​part 603. A threaded section is provided on the outer side of the sealing part 601. A groove is provided on the side of the flange part 602 facing the end of the piston rod 1. A first sealing ring 7 is provided in the groove. Sealant is filled between the sealing part 601 and the piston rod 1. The flange part 602 contacts the end of the piston rod 1 to form a pressing surface. The snap-fit ​​part 603 is preferably square in structure for easy... Personnel use tools to tighten the snap-fit ​​part 603 to achieve quick assembly of the plug; two fixing grooves 103 are respectively opened on the outer periphery of the piston rod 1 corresponding to the piston 4 and the upper cap 3, and an O-ring 12 is provided in each fixing groove 103; a lower end cover 15 is provided at the bottom of the lower cylinder 5, and an air inlet 1501 is provided on the lower end cover 15 corresponding to the through hole 101; a buffer pad 16 is provided on the upper side of the lower end cover 15 corresponding to the lower side of the piston 4; a circular pad block 17 covers the upper end of the piston rod 1 and is fixedly connected to the upper cap 3 by fasteners.

[0020] The advantages of this utility model are as follows: the bushing 9 can reduce the wear between the guide ring 503 and the piston rod 1, reduce the fatigue of the piston rod 1, and increase its service life; the installation step 505 facilitates the assembly of the bushing 9 and the Sterling ring 10, and the Sterling ring 10 has the advantages of high wear resistance and low friction effect, ensuring the wear resistance and sealing performance of the sealing structure; the Glyd ring 13 can adapt to rapid pressure changes and has very high pressure stability. Combined with the Y-ring 14, it ensures the pressure resistance and sealing performance of the sealing structure.

[0021] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. An air cushion cylinder piston rod seal structure comprising a piston rod having a through hole formed therein, characterized by, The piston rod top is fixedly connected with the upper top hat through a round nut, the piston rod bottom is fixedly connected with the piston through a round nut, the upper top hat is in sliding connection with the lower cylinder body, the lower cylinder body comprises an upper cavity and a lower cavity, a guide ring is arranged between the upper cavity and the lower cavity, the piston can slide up and down in the lower cavity, the piston rod is provided with a gas outlet hole in communication with a through hole corresponding to the upper cavity, a plug is threadedly connected to the upper end of the through hole, the plug comprises a sealing part, a flange part and a clamping part, a threaded section is arranged outside the sealing part, a recess is formed in one side of the flange part towards the piston rod end, a first sealing ring is arranged in the recess, sealing glue is filled between the sealing part and the piston rod, and the flange part is in contact with the piston rod end to form a compression surface.

2. A gas cushion cylinder piston rod seal structure according to claim 1, wherein A mounting groove and a mounting step are formed in the inner wall of the guide ring corresponding to the piston rod, a second sealing ring is arranged in the mounting groove, and a bushing, a stator ring and a pressing plate are sequentially arranged in the mounting step from bottom to top.

3. The air cushion cylinder piston rod seal structure according to claim 1, wherein, A plurality of fixing grooves are formed in the outer periphery of the piston rod corresponding to the piston and the upper top hat, respectively, and O-rings are arranged in the fixing grooves.

4. The air cushion cylinder piston rod seal structure according to claim 1, wherein, First and second sealing grooves are formed in the outer periphery of the piston corresponding to the lower cavity, a Glorene ring is arranged in the first sealing groove, and a Y-shaped ring is arranged in the second sealing groove.

5. The air cushion cylinder piston rod seal structure according to claim 1, wherein, A lower end cover is arranged at the bottom of the lower cylinder body, and an air inlet is arranged in the lower end cover corresponding to the through hole.

6. An air cushion cylinder piston rod seal structure according to claim 5, wherein A buffer pad is arranged on the upper side of the lower end cover corresponding to the lower side of the piston.

7. An air cushion cylinder piston rod seal structure according to any one of claims 1 to 6, characterized in that A circular ring pad block is further arranged, which covers the upper end of the piston rod and is fixedly connected with the upper top hat through fasteners.

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