Nitrogen spring structure with over-travel protection

Abstract

The nitrogen spring structure with the over-travel protection function comprises a cylinder body, a plunger rod and an installation piece which are installed in a matched mode, an installation opening is formed in the cylinder body, the installation piece is connected to the plunger rod in a sleeved mode and then installed with the installation opening in the cylinder body in a matched mode, and the installation piece is provided with a first annular blocking part. A first annular blocking part is arranged on the plunger rod, an annular convex edge is arranged at the bottom of the plunger rod and abuts against the first annular blocking part, an annular step part is arranged on the plunger rod, a second annular blocking part matched with the annular step part is arranged on the installation piece and located above the first annular blocking part, and the diameter of the second annular blocking part is smaller than that of the first annular blocking part. Under high-pressure elastic pressure, the first annular blocking part abuts against the annular convex edge to achieve the first blocking effect, and after the annular convex edge is damaged, the annular step part abuts against the second annular blocking part to achieve the second blocking effect so as to achieve the over-travel protection effect.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen spring technology, specifically a nitrogen spring structure with overtravel protection. Background Technology

[0002] Nitrogen springs (also known as die nitrogen springs, nitrogen springs, nitrogen cylinders, or nitrogen cylinders) are a new type of elastic component that uses high-pressure nitrogen as the working medium. They are small in size, have high elastic force, long stroke, stable operation, are precisely manufactured, have a long service life (one million cycles), a smooth elastic force curve, and do not require pre-tensioning. They can perform tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions to accomplish, simplifying mold design and manufacturing, facilitating mold installation and adjustment, extending mold service life, and ensuring stable product quality. They can also be designed as a nitrogen spring system to work as part of the mold, easily achieving constant pressure and delayed action within the system. They are a new generation of ideal elastic components with flexible properties.

[0003] However, in the use of existing nitrogen springs, once an overload occurs, the nitrogen spring will be compressed to form high-pressure gas. If the spring structure is damaged, the spring assembly will be ejected under high pressure, which will damage the equipment. In more serious cases, it may eject and injure the equipment operator, posing a safety hazard. Utility Model Content

[0004] The purpose of this invention is to provide a nitrogen spring structure with overtravel protection, which solves the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a nitrogen spring structure with overstroke protection, comprising a cylinder body, a plunger rod, and a mounting component that are fitted together. The cylinder body has an installation opening. The mounting component is sleeved onto the plunger rod and fitted into the installation opening on the cylinder body. A sealed space is formed between the cylinder body, the plunger rod, and the mounting component, and the sealed space is filled with nitrogen. The mounting component has a first annular plug. The bottom of the plunger rod has an annular protrusion that abuts against the first annular plug. The plunger rod has an annular stepped portion above the annular protrusion. The mounting component has a second annular plug that matches the annular stepped portion. The second annular plug is located above the first annular plug, and the diameter of the second annular plug is smaller than the diameter of the first annular plug.

[0006] Preferably, a pressure relief valve is provided at the bottom of the cylinder body, which passes through the bottom of the cylinder body and is threadedly connected to the cylinder body.

[0007] Preferably, a plurality of sealing rings are provided between the mounting component and the cylinder body.

[0008] Preferably, the bottom of the cylinder is provided with an air inlet, and the air inlet is provided with a sealing element.

[0009] Preferably, the cylinder block and the mounting component are interference-fitted.

[0010] Preferably, a damping plate is sleeved on the plunger rod, the damping plate is located above the annular convex edge, and the damping plate is in close contact with the annular convex edge.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention achieves normal travel by setting the first annular plug and the annular protrusion to abut against each other. If high pressure occurs, the first annular plug and the annular protrusion will achieve the first blocking effect. If the annular protrusion is damaged, the annular stepped part will abut against the second annular plug to achieve the second blocking effect, thus achieving the overtravel protection effect. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 This is a cross-sectional view of the mounting component of this utility model.

[0015] The reference numerals and names in the figure are as follows:

[0016] 1. Cylinder block; 2. Piston rod; 3. Mounting component; 4. Inlet port; 5. First ring plug; 6. Annular convex edge; 7. Annular stepped part; 8. Second ring plug; 9. Pressure relief valve; 10. Sealing component; 11. Sealing ring; 12. Vibration damping plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] Please see Figures 1 to 2 This utility model provides an embodiment of a nitrogen spring structure with overtravel protection, comprising a cylinder body 1, a plunger rod 2, and a mounting component 3. The cylinder body 1 has an installation opening. The mounting component 3 is sleeved on the plunger rod 2 and then fitted with the installation opening on the cylinder body 1 to form a spring structure. The cylinder body 1 and the mounting component 3 are interference-fitted, and a sealed space is formed between the cylinder body 1, the plunger rod 2, and the mounting component 3. The bottom of the cylinder body 1 is provided with an air inlet 4, through which high-pressure nitrogen can be injected into the sealed space. The air inlet 4 is then sealed by a sealing component 10. The plunger rod 2 can be pressed back towards the sealed space, and the high-pressure nitrogen in the sealed space causes the plunger rod 2 to spring back, achieving a spring effect.

[0020] The technical points of this embodiment are as follows: the mounting component 1 is provided with a first annular plug 5, the bottom of the plunger rod 2 is provided with an annular protrusion 6, and the annular protrusion 6 abuts against the first annular plug 5. The plunger rod 2 is provided with an annular step 7 above the annular protrusion. The mounting component 3 is provided with a second annular plug 8 that matches the annular step 7. The second annular plug 8 is located above the first annular plug 5, and the diameter of the second annular plug 8 is smaller than the diameter of the first annular plug 5. If the plunger rod 2 experiences an overload stroke, the nitrogen in the sealed space is under high pressure. When the plunger rod 2 rebounds, the first annular plug 5 and the annular protrusion 6 achieve the first blocking effect. If the annular protrusion 6 is damaged, it falls into the sealed space, and the annular step 7 abuts against the second annular plug 8, performing a second blocking. The nitrogen in the sealed space is discharged from the gap between the mounting component 3 and the plunger rod 2, thereby achieving the overstroke protection effect.

[0021] In this embodiment, a damping plate 12 is sleeved on the plunger rod 2. The damping plate 12 is located above the annular convex edge 6 and is in close contact with the annular convex edge 6. The damping plate 12 can reduce the impact force of the annular convex edge 6 on the first annular plug 5, reduce the vibration frequency, maintain the precise spring compression direction of the spring, and at the same time reduce the impact force, which can increase the impact force range of the annular convex edge 6 on the first annular plug 5, thereby improving the service life of the spring structure.

[0022] Furthermore, a pressure relief valve 9 is provided at the bottom of the cylinder body 1. The pressure relief valve 9 passes through the bottom of the cylinder body 1 and is threadedly connected to the cylinder body 1. If the piston rod 2 is overloaded during the pressing process and the bottom of the piston rod 2 comes into contact with the pressure relief valve 9, the pressure relief valve 9 will open and discharge the nitrogen gas in the sealed space, thus achieving the effect of over-stroke protection.

[0023] In this embodiment, a plurality of sealing rings 11 are provided between the mounting component 3 and the cylinder body 1. The plurality of sealing rings 11 are used to seal the gap between the mounting component 3 and the cylinder body 1, thereby improving the sealing effect.

[0024] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A nitrogen spring structure with overtravel protection, comprising a cylinder block, a piston rod, and a mounting component for mating installation, characterized in that: The cylinder body has an installation opening. The mounting component is fitted onto the plunger rod and then fitted into the installation opening on the cylinder body. A sealed space is formed between the cylinder body, the plunger rod, and the mounting component. The sealed space is filled with nitrogen gas. The mounting component has a first annular plug. The bottom of the plunger rod has an annular protrusion that abuts against the first annular plug. The plunger rod has an annular stepped portion above the annular protrusion. The mounting component has a second annular plug that matches the annular stepped portion. The second annular plug is located above the first annular plug, and the diameter of the second annular plug is smaller than the diameter of the first annular plug.

2. The nitrogen spring structure with overtravel protection according to claim 1, characterized in that: A pressure relief valve is provided at the bottom of the cylinder body, which passes through the bottom of the cylinder body and is threadedly connected to the cylinder body.

3. The nitrogen spring structure with overtravel protection according to claim 1, characterized in that: Several sealing rings are provided between the mounting component and the cylinder body.

4. The nitrogen spring structure with overtravel protection according to claim 1, characterized in that: The cylinder body has an air inlet at the bottom, and the air inlet is equipped with a sealing component.

5. A nitrogen spring structure with overtravel protection according to claim 1, characterized in that: The cylinder block is interference-fitted with the mounting component.

6. A nitrogen spring structure with overtravel protection according to claim 1, characterized in that: A damping plate is fitted on the plunger rod, the damping plate is located above the annular convex edge, and the damping plate is in close contact with the annular convex edge.

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