Segmented pressurized nitrogen spring

Abstract

This utility model relates to the field of nitrogen spring technology, and in particular to a segmented pressurizing nitrogen spring, comprising a shell, a piston rod, a piston plate, and a segmented pressurizing plate. The shell has a compression chamber and a segmented pressurizing chamber connected sequentially from top to bottom, with a limiting step forming between the compression chamber and the segmented pressurizing chamber. The top surface of the shell has a through hole communicating with the compression chamber, through which the piston rod slides in a sealed manner. The piston plate is fixedly connected to the bottom end of the piston rod and slidably connected to the inner wall of the compression chamber. The segmented pressurizing plate is slidably connected to the inner wall of the segmented pressurizing chamber. The shell has an inflation valve communicating with the segmented pressurizing chamber. The limiting step abuts against both ends of the segmented pressurizing plate, and the segmented pressurizing plate has an axially formed through hole. This application has a simple structure, low cost, and can provide a linear relationship between stepped upward displacement and force, realizing a two-stage pressurizing stroke. It is particularly suitable for stamping dies to meet the need for stepped upward increase in support force during the stamping process.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen spring technology, and in particular to a segmented pressurized nitrogen spring. Background Technology

[0002] Nitrogen springs are an indispensable component in stamping die design, serving as the primary actuator for achieving the feasibility and stability of the forming process. Existing nitrogen springs only provide a single displacement-force mechanical function, which cannot match the force and displacement characteristics required for a complete stroke in stamping processes. Stamping processes demand variable support force characteristics. For example, for stamped parts with large rebound, optimal forming quality can only be achieved by meeting specific pressure variation process conditions. This necessitates that the die pressure ring component based on nitrogen springs provide a stepped pressure surge loading state, which existing independent nitrogen springs cannot meet, requiring alternative process design methods. For example, adding floating drawbars or designing nitrogen cylinders in a stepped combination. This not only increases the size of the formed part material but also requires expanding the die design space, increasing production costs. If nitrogen springs could be designed to provide stepped variable support force, it would greatly satisfy the design requirements of stamping processes without increasing the size of the formed part material or the cost and space of the die design.

[0003] Among existing patents, Chinese patent application number 201620040064.9 discloses a permanent magnet high-pressure nitrogen spring, including a cylinder, permanent magnet A, permanent magnet B, permanent magnet C, permanent magnet D, an inflation valve, a rod piston, an upper end cover, a rodless moving piston, and a lower end cover. A cavity A is formed inside the piston rod, and permanent magnet A is installed at the bottom of the piston body. Air vents A are formed on the piston body and permanent magnet A. Permanent magnets B and C are installed inside the rodless moving piston, and air vents B are formed on the rodless moving piston. Cavity B is formed between the rodless moving piston and the piston body. Permanent magnet D is installed on the top of the lower end cover, and air vents C are formed on the lower end cover. Cavity C is formed between the lower end cover and the rodless moving piston. This patent has a complex structure, high cost, and requires multiple permanent magnets that magnetically attract or repel each other. Therefore, its shortcomings are obvious, and a solution is urgently needed. Utility Model Content

[0004] In order to solve the above-mentioned technical problems, the purpose of this utility model is to provide a segmented pressurized nitrogen spring.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A segmented pressurized nitrogen spring includes a housing, a piston rod, a piston plate, and a segmented pressurizing plate. The housing has a compression chamber and a segmented pressurizing chamber connected sequentially from top to bottom, with a limiting step forming between them. The top surface of the housing has a through hole communicating with the compression chamber. The piston rod slides through the through hole in a sealed manner. The piston plate is fixedly connected to the bottom end of the piston rod and slidably connected to the inner wall of the compression chamber. The segmented pressurizing plate is slidably connected to the inner wall of the segmented pressurizing chamber. The bottom of the housing has an inflation valve communicating with the segmented pressurizing chamber. The limiting step abuts against both ends of the segmented pressurizing plate, and the segmented pressurizing plate has an axially formed through hole.

[0007] Furthermore, there are multiple segmented pressurizing chambers and multiple segmented pressurizing plates, with each segmented pressurizing chamber corresponding to a specific segmented pressurizing plate. In two adjacent segmented pressurizing chambers, the width of the previous segmented pressurizing chamber is smaller than the width of the next segmented pressurizing chamber. A segmented step is formed between two adjacent segmented pressurizing chambers, and the segmented step is used to abut against the corresponding segmented pressurizing plate.

[0008] Furthermore, the outer shell includes a shell body, a top plate installed on the top surface of the shell body, and a bottom plate installed on the bottom surface of the shell body. The compression chamber and the segmented pressurization chamber are disposed in the shell body, the through hole is disposed in the top plate, and the inflation valve is embedded in the bottom plate.

[0009] Furthermore, a sealing ring is provided between the base plate and the shell.

[0010] Furthermore, a dustproof ring is embedded in the inner wall of the through hole, and the plug rod slides through the dustproof ring, with the inner wall of the dustproof ring in close contact with the outer wall of the plug rod.

[0011] Furthermore, a first sealing ring is embedded in the peripheral wall of the piston plate, which is used to seal the gap between the peripheral wall of the piston plate and the inner wall of the compression chamber; a second sealing ring is embedded in the peripheral wall of the segmented booster plate, which is used to seal the gap between the peripheral wall of the segmented booster plate and the inner wall of the segmented booster chamber.

[0012] Furthermore, there are at least two first sealing rings, and the piston plate has an oil reservoir recessed on its peripheral sidewall. The oil reservoir is located between two adjacent first sealing rings, and an oil reservoir cavity is formed between the inner wall of the oil reservoir and the inner sidewall of the compression cavity.

[0013] Furthermore, the piston plate has an axially formed oil injection hole that communicates with the oil reservoir, and the outer port of the oil injection hole is detachably connected to a sealing plug.

[0014] Furthermore, a vent is provided on the top side wall of the outer casing, and the vent is connected to the top of the compression chamber.

[0015] Furthermore, a protruding insert is provided in the center of the bottom surface of the piston plate, and a third sealing ring is embedded in the peripheral wall of the insert. A groove is recessed on the top surface of the segmented pressure plate, and the insert can be inserted into the groove. The third sealing ring is used to seal the gap between the peripheral wall of the insert and the inner wall of the groove.

[0016] The beneficial effects of this utility model are as follows: In practical applications, nitrogen is injected into the compression chamber and the segmented pressurization chamber through the inflation valve, causing the piston rod to extend out of the through hole, the piston plate to abut against the top wall of the compression chamber, and the segmented pressurization plate to abut against the limiting step. When the top of the piston rod is subjected to downward extrusion force, the piston rod is forced to move downward and drives the piston plate to move downward in the compression chamber. During the process of the piston plate moving downward along the compression chamber, the piston plate compresses the nitrogen in the compression chamber into the segmented pressurization chamber through the through hole. This process is the first stage of pressurization process, realizing the linear pressurization of displacement and force in the first stage. When the piston plate contacts the segmented pressure plate, the first stage of pressurization is completed, and the piston plate and the segmented pressure plate together form an assembly. As the assembly continues to descend, it compresses the nitrogen gas in the segmented pressure chamber. During this process, due to the increase in the force-bearing surface from the piston plate to the assembly, the assembly experiences a sudden increase in the reaction force from the compressed nitrogen gas, reaching (jumping to) the preset reaction force value. Then, as the assembly moves downward along the segmented pressure chamber and compresses the nitrogen gas, this is the second stage of pressurization, achieving linear pressurization of displacement and force. When the downward pressure at the top of the piston rod is released, the piston rod and the assembly move upward synchronously and reset. When the segmented pressure plate contacts the limiting step, the piston rod and piston plate continue to move upward and reset until the piston plate contacts and is limited by the top wall of the compression chamber. This invention has a simple structure and low cost. It can provide a linear relationship between stepped upward displacement and force, and realizes a two-stage pressure boosting stroke. It is particularly suitable for stamping dies to meet the need for stepped upward increase of support force during the stamping process. Attached Figure Description

[0017] Figure 1 This is a half-sectional view of the present invention.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Outer shell; 2. Plug rod; 3. Piston plate; 4. Segmented pressure plate; 5. Compression chamber; 6. Segmented pressure chamber; 7. Limiting step; 8. Through hole; 9. Inflation valve; 10. Through hole; 11. Shell body; 12. Top plate; 13. Bottom plate; 14. Sealing ring; 15. Dustproof ring; 16. First sealing ring; 17. Second sealing ring; 18. Oil reservoir; 19. Oil filling hole; 20. Vent hole; 21. Insert post; 22. Third sealing ring; 23. Groove; 25. First guide ring; 26. Second guide ring; 27. Fourth sealing ring. Detailed Implementation

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0021] like Figure 1 As shown, this utility model provides a segmented pressurized nitrogen spring, which includes a housing 1, a piston rod 2, a piston plate 3, and a segmented pressurizing plate 4. The housing 1 has a compression chamber 5 and a segmented pressurizing chamber 6 connected sequentially from top to bottom. A limiting step 7 is formed between the compression chamber 5 and the segmented pressurizing chamber 6. The top surface of the housing 1 has a through hole 8 communicating with the compression chamber 5. The piston rod 2 slides through the through hole 8 in a sealed manner. The piston plate 3 is fixedly connected to the bottom end of the piston rod 2 and slidably connected to the inner wall of the compression chamber 5. The segmented pressurizing plate 4 is slidably connected to the inner wall of the segmented pressurizing chamber 6. The bottom of the housing 1 has an inflation valve 9 communicating with the segmented pressurizing chamber 6. The limiting step 7 is used to abut the two ends of the segmented pressurizing plate 4. The segmented pressurizing plate 4 has an axial through hole 10.

[0022] In practical applications, nitrogen is injected into the compression chamber 5 and the segmented pressurization chamber 6 through the inflation valve 9, causing the piston rod 2 to extend out of the through hole 8. The piston plate 3 abuts against the top wall of the compression chamber 5, and the segmented pressurization plate 4 abuts against the limiting step 7. When the top of the piston rod 2 is subjected to downward extrusion force, the piston rod 2 is forced downward and drives the piston plate 3 to move downward within the compression chamber 5. During the downward movement of the piston plate 3 along the compression chamber 5, the piston plate 3 compresses the nitrogen in the compression chamber 5 through the through hole 10 into the segmented pressurization chamber 6. This process is the first stage of pressurization, achieving linear pressurization of displacement and force in the first stage. When When piston plate 3 contacts segmented pressure plate 4, the first stage of pressurization is completed, and piston plate 3 and segmented pressure plate 4 together form an assembly. As the assembly continues to descend, it compresses the nitrogen gas in segmented pressure chamber 6. During this process, due to the increase in the force-bearing surface from piston plate 3 to the force-bearing surface of the assembly, the assembly experiences a sudden increase in the reaction force of the compressed nitrogen gas, reaching (suddenly increasing to / jumping to) the preset reaction force value. Then, as the assembly moves downward along segmented pressure chamber 6 and compresses the nitrogen gas, this process constitutes the second stage of pressurization, achieving linear pressurization of displacement and force in the second stage. When the downward pressing force at the top of piston rod 2 is released, piston rod 2 and the assembly move upward synchronously and reset. When segmented pressure plate 4 contacts limiting step 7, piston rod 2 and piston plate 3 continue to move upward and reset until piston plate 3 contacts and is limited by the top wall of compression chamber 5. This invention has a simple structure and low cost. It can provide a linear relationship between stepped upward displacement and force, and realizes a two-stage pressure boosting stroke. It is particularly suitable for stamping dies to meet the need for stepped upward increase of support force during the stamping process.

[0023] In this embodiment, there are multiple segmented pressurizing chambers 6 and multiple segmented pressurizing plates 4, with each segmented pressurizing chamber 6 corresponding to a specific segmented pressurizing plate 4. In two adjacent segmented pressurizing chambers 6, the width of the previous segmented pressurizing chamber 6 is smaller than the width of the next segmented pressurizing chamber 6. A segmented step is formed between two adjacent segmented pressurizing chambers 6, and the segmented step is used to abut against the corresponding segmented pressurizing plate 4. This structural design, according to the above working principle, can provide a linear relationship between multi-step upward displacement and force, realizing a multi-stage pressurization stroke.

[0024] In this embodiment, the outer casing 1 includes a casing body 11, a top plate 12 mounted on the top surface of the casing body 11, and a bottom plate 13 mounted on the bottom surface of the casing body 11. A compression chamber 5 and a segmented pressurization chamber 6 are disposed on the casing body 11. A through hole 8 is disposed on the top plate 12, and an inflation valve 9 is embedded in the bottom plate 13. This structural design enables modular assembly of the outer casing 1, facilitating the disassembly and assembly of the segmented pressurization plate 4 and the piston.

[0025] In this embodiment, a sealing ring 14 is provided between the base plate 13 and the shell 11. The sealing ring 14 seals the gap between the base plate 13 and the shell 11, providing good airtightness and avoiding air leakage.

[0026] In this embodiment, a dustproof ring 15 is embedded in the inner wall of the through hole 8, and the plug rod 2 slides through the dustproof ring 15, with the inner wall of the dustproof ring 15 in close contact with the outer wall of the plug rod 2. The dustproof ring 15 not only serves to prevent dust and foreign objects from entering the compression chamber 5, but also seals the gap between the inner wall of the through hole 8 and the outer wall of the plug rod 2, improving airtightness.

[0027] In this embodiment, a first sealing ring 16 is embedded in the peripheral wall of the piston plate 3. The first sealing ring 16 is used to seal the gap between the peripheral wall of the piston plate 3 and the inner wall of the compression chamber 5. A second sealing ring 17 is embedded in the peripheral wall of the segmented booster plate 4. The second sealing ring 17 is used to seal the gap between the peripheral wall of the segmented booster plate 4 and the inner wall of the segmented booster chamber 6. This structural design can effectively avoid air leakage during operation, making the operation of this utility model reliable.

[0028] In this embodiment, there are at least two first sealing rings 16. An oil reservoir 18 is recessed on the peripheral wall of the piston plate 3, located between two adjacent first sealing rings 16. An oil reservoir cavity is formed between the inner wall of the oil reservoir 18 and the inner wall of the compression chamber 5. In practical applications, lubricating oil is stored in the oil reservoir cavity. During the up-and-down movement of the piston plate 3, the lubricating oil not only lubricates but also cools the piston.

[0029] In this embodiment, the piston plate 3 has an axially formed oil injection hole 19 that communicates with the oil reservoir 18. A sealing plug is detachably connected to the outer port of the oil injection hole 19. When it is necessary to add lubricating oil to the oil reservoir, the sealing plug is opened, and lubricating oil is added to the oil reservoir through the oil injection hole 19. After the addition is completed, the sealing plug is closed to shut off the oil injection hole 19, which facilitates the addition of lubricating oil.

[0030] In this embodiment, a vent 20 is provided on the top side wall of the outer casing 1, and the vent 20 is connected to the top of the compression chamber 5. During the up-and-down movement of the piston plate 3, the vent 20 serves to exhaust and intake air, preventing a vacuum state from being generated above the piston plate 3, which would affect the upward reset and downward movement of the piston plate 3.

[0031] In this embodiment, a post 21 protrudes from the center of the bottom surface of the piston plate 3. A third sealing ring 22 is embedded in the peripheral sidewall of the post 21. A groove 23 is recessed on the top surface of the segmented pressure plate 4, allowing the post 21 to be inserted into the groove 23. The third sealing ring 22 seals the gap between the peripheral sidewall of the post 21 and the inner sidewall of the groove 23. When the post 21 is inserted into the groove 23 and the third sealing ring 22 seals the gap between the post 21 and the inner sidewall of the groove 23, it indicates that the first stage of the pressure boosting stroke is completed. The piston plate 3 and the segmented pressure plate 4 then form a new assembly for the second or more stages of the pressure boosting stroke.

[0032] Specifically, a first guide ring 25 is embedded in the peripheral wall of the piston plate 3 and slidably connected to the inner wall of the compression chamber 5; a second guide ring 26 is embedded in the peripheral wall of the segmented booster plate 4 and slidably connected to the inner wall of the segmented booster chamber 6. By setting the first guide ring 25 and the second guide ring 26, the vertical movement stability of the piston plate 3 and the segmented booster plate 4 is improved.

[0033] Specifically, a fourth sealing ring 27 is embedded in the top wall of the limiting step 7 and the top wall of the segmented step. This further improves the airtightness between the segmented pressure plate 4 and the limiting step 7, as well as the airtightness between the segmented pressure plate 4 and the segmented step.

[0034] Specifically, a load valve is embedded in the base plate 13.

[0035] All technical features in this embodiment can be freely combined according to actual needs.

[0036] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A segmented pressurized nitrogen spring, characterized in that: The device includes a housing (1), a piston rod (2), a piston plate (3), and a segmented pressurizing plate (4). The housing (1) has a compression chamber (5) and a segmented pressurizing chamber (6) connected from top to bottom. A limiting step (7) is formed between the compression chamber (5) and the segmented pressurizing chamber (6). The top surface of the housing (1) has a through hole (8) that communicates with the compression chamber (5). The piston rod (2) slides through the through hole (8) in a sealed manner. The piston plate (3) is fixedly connected to the bottom end of the piston rod (2). The piston plate (3) is slidably connected to the inner wall of the compression chamber (5). The segmented pressurizing plate (4) is slidably connected to the inner wall of the segmented pressurizing chamber (6). The bottom of the housing (1) has an inflation valve (9) that communicates with the segmented pressurizing chamber (6). The limiting step (7) is used to abut against both ends of the segmented pressurizing plate (4). The segmented pressurizing plate (4) has a through hole (10) in the axial direction.

2. The segmented pressurized nitrogen spring according to claim 1, characterized in that: The number of segmented pressurizing chambers (6) and the number of segmented pressurizing plates (4) are both multiple. The multiple segmented pressurizing chambers (6) are respectively set one-to-one with the multiple segmented pressurizing plates (4). In two adjacent segmented pressurizing chambers (6), the width of the upper segmented pressurizing chamber (6) is smaller than the width of the lower segmented pressurizing chamber (6). A segmented step is formed between two adjacent segmented pressurizing chambers (6), and the segmented step is used to abut against the corresponding segmented pressurizing plate (4).

3. The segmented pressurized nitrogen spring according to claim 1, characterized in that: The outer shell (1) includes a shell body (11), a top plate (12) installed on the top surface of the shell body (11) and a bottom plate (13) installed on the bottom surface of the shell body (11). A compression chamber (5) and a segmented pressurization chamber (6) are provided in the shell body (11), a through hole (8) is provided in the top plate (12), and an inflation valve (9) is embedded in the bottom plate (13).

4. The segmented pressurized nitrogen spring according to claim 3, characterized in that: A sealing ring (14) is provided between the bottom plate (13) and the shell (11).

5. The segmented pressurized nitrogen spring according to claim 1, characterized in that: A dustproof ring (15) is fitted into the inner wall of the through hole (8). The plug rod (2) slides through the dustproof ring (15), and the inner wall of the dustproof ring (15) is in close contact with the outer wall of the plug rod (2).

6. The segmented pressurized nitrogen spring according to claim 1, characterized in that: A first sealing ring (16) is embedded in the peripheral wall of the piston plate (3), which is used to seal the gap between the peripheral wall of the piston plate (3) and the inner wall of the compression chamber (5); a second sealing ring (17) is embedded in the peripheral wall of the segmented booster plate (4), which is used to seal the gap between the peripheral wall of the segmented booster plate (4) and the inner wall of the segmented booster chamber (6).

7. The segmented pressurized nitrogen spring according to claim 6, characterized in that: The number of first sealing rings (16) is at least two. The peripheral sidewall of the piston plate (3) is recessed with an oil storage groove (18). The oil storage groove (18) is located between two adjacent first sealing rings (16). An oil storage cavity is formed between the inner wall of the oil storage groove (18) and the inner sidewall of the compression cavity (5).

8. The segmented pressurized nitrogen spring according to claim 7, characterized in that: The piston plate (3) has an axially opened oil injection hole (19) that communicates with the oil reservoir (18), and the outer port of the oil injection hole (19) is detachably connected with a sealing plug.

9. The segmented pressurized nitrogen spring according to claim 1, characterized in that: A vent (20) is provided on the top side wall of the outer casing (1), and the vent (20) is connected to the top of the compression chamber (5).

10. The segmented pressurized nitrogen spring according to claim 1, characterized in that: A piston plate (3) has a protruding insert (21) in the middle of its bottom surface. A third sealing ring (22) is embedded in the peripheral wall of the insert (21). A groove (23) is recessed on the top surface of the segmented pressure plate (4). The insert (21) can be inserted into the groove (23). The third sealing ring (22) is used to seal the gap between the peripheral wall of the insert (21) and the inner wall of the groove (23).

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