Two-stage buffering double-cavity pneumatic rod
By designing a two-stage buffer double-chamber pneumatic rod and employing the synergistic effect of the buffer damping cylinder and the auxiliary compensation piston, the problems of insufficient buffering and sealing of the pneumatic rod under high-frequency impact and instantaneous high-pressure load were solved, thus achieving stable operation and improved safety of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-30
- Publication Date
- 2026-03-24
AI Technical Summary
Existing pneumatic rods have insufficient buffering capacity under high-frequency impact and instantaneous high-pressure load conditions, resulting in damage to connecting parts and poor sealing, which affects the stability and safety of equipment operation.
A two-stage buffer dual-chamber pneumatic rod is designed, which uses the synergistic effect of the buffer damping cylinder and the auxiliary compensating piston to form a main/auxiliary two-stage buffer structure, and improves motion accuracy and sealing performance through a conical guide bevel and a composite sealing assembly.
It effectively absorbs impact energy, suppresses rigid collisions, improves the operational stability and safety of equipment, extends service life, and enhances sealing and anti-sway capabilities.
Smart Images
Figure CN224032867U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pneumatic rod technical field especially relates to a two-stage buffer double -cavity pneumatic rod. BACKGROUND
[0002] In today's industrial field, pneumatic rod as the key transmission and control component is widely used in various mechanical equipment. From the precise positioning and material handling of automatic production line, to the opening and closing of car door, engine cover support in automobile manufacturing, to the buffer of aircraft landing gear and the adjustment of wing flap in aerospace field, the performance of pneumatic rod is directly related to the running stability, reliability and service life of equipment. However, there are many problems in the existing pneumatic rod technology that need to be solved, which seriously restricts its efficient application in complex working conditions.
[0003] In the aspect of high-frequency impact working condition, taking the automatic stamping production line as an example, the high-speed stamping action of the die will make the pneumatic rod frequently bear high-intensity impact force. The pneumatic rod with traditional single-stage buffer structure cannot effectively absorb the impact energy when facing such high-frequency and high-energy impact due to its limited buffer capacity. This results in that the connecting components bear a lot of stress under the action of each impact, which is prone to fatigue damage, and further causes faults such as loosening and fracture, not only greatly shortens the normal operation time of the equipment, increases the maintenance cost, but also may affect the production progress due to sudden equipment failure, causing serious economic losses.
[0004] And in the scene of instantaneous high-pressure load, like some heavy machinery driven by hydraulic and pneumatic hybrid, when starting or braking instantaneously, the system pressure will rise sharply, forming a strong instantaneous high pressure on the pneumatic rod. The single-stage buffer pneumatic rod will often fail quickly in this case, and cannot inhibit the rigid collision between the piston and the cylinder. This rigid collision not only produces strong mechanical vibration and noise, which interferes with the normal operation of the equipment, but also causes irreversible wear and damage to the key components such as cylinder, piston and sealing element, reduces the overall performance and service life of the pneumatic rod, and even may cause safety accidents, threatening the life safety of the operator.
[0005] Moreover, the sealing design of the traditional pneumatic rod has obvious defects. The cylinder sealing mainly depends on a single piston assembly. Once micro-cracks appear on the cylinder wall, which is not uncommon under the action of alternating stress for a long time, dust, impurities and other foreign matters from the outside world may enter the cylinder through the micro-cracks, affecting the purity of the gas and reducing the transmission efficiency of the pneumatic rod. At the same time, micro-cracks may also cause gas leakage, making the pressure in the cylinder unstable and affecting the normal working performance of the pneumatic rod. More seriously, due to the lack of redundant buffer protection mechanism, when the cylinder sealing is damaged, the movement of the pneumatic rod cannot be effectively buffered and controlled, greatly increasing the safety hazards of equipment operation. UTILITY MODEL CONTENT
[0006] The utility model aims at solving above-mentioned defects, provide a two-stage buffer double cavity pneumatic rod.
[0007] In order to overcome the defects in the background art, the utility model solves technical scheme that the technical scheme that it adopts is: a two-stage buffer double cavity pneumatic rod, including cylinder, its one end is configured as closed end, the other end is configured as open end, the open end is configured in the sealing end cap assembly for plugging, to make the closed structure in the cylinder, the two ends are provided for the cylinder inlet and outlet gas inlet and outlet gas port respectively;
[0008] Piston rod, along the cylinder axial direction arrangement, extend into the cylinder interior through sealing end cap assembly, its coaxial piston and auxiliary compensation piston are provided on it, and the main working piston is contained in the cylinder for the piston movement in the cylinder;
[0009] Buffering damper cylinder, it is arranged on the inner wall of the closed end of the cylinder, and it is matched with the auxiliary compensation piston.
[0010] Further improvement, including the free end of the piston rod and the closed end of the cylinder are respectively installed with U-shaped connector.
[0011] Further improvement, including the inner hole port of the buffering damper cylinder is provided with the tapered guide bevel for guiding the auxiliary compensation piston.
[0012] Further improvement, including the main working piston and auxiliary compensation piston are embedded with the composite sealing assembly of annular structure radially.
[0013] Further improvement, including the closed end of the cylinder is semispherical.
[0014] The utility model has the advantages that: the design is through the synergies of buffering damper cylinder and auxiliary compensation piston, forms main / auxiliary two-stage buffer structure, can absorb impact energy in extreme conditions in stages, effectively inhibits instantaneous rigid collision, reduces the damage risk of connecting component, and provides redundancy protection when the cylinder is damaged;The tapered guide bevel design realizes ±0.1mm level movement trajectory calibration, actively corrects the axial deviation of piston through inclined surface contact force, ensures the accurate alignment of buffering stroke, and improves the anti-deviation ability by more than 40%;The semispherical closed end realizes stress distribution homogenization. BRIEF DESCRIPTION OF DRAWINGS
[0015] The utility model is further illustrated below in connection with the drawings and examples.
[0016] Figure 1 It is the front view of the utility model;
[0017] Figure 2 It is the front view of the buffering damper cylinder in the utility model.
[0018] Figure 3 is the main view of the main working piston in the utility model;
[0019] Figure 1 - cylinder, 2 - main working piston, 3 - buffer damping cylinder, 4 - U-shaped connector, 5 - piston rod, 6 - sealing end cap assembly, 7 - auxiliary compensation piston, 8 - composite sealing assembly, 9 - inlet and outlet air port;
[0020] 301 - conical guide groove. DETAILED DESCRIPTION
[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. All other embodiments obtained by the person skilled in the art without creative labor belong to the scope of protection of the utility model.
[0022] Reference Figure 1 A two-stage buffer double-cavity pneumatic rod, comprising a cylinder 1, one end of which is configured as a closed end through an integral molding process, and the other end is configured as an open end, a sealing end cap assembly 6 for plugging is arranged in the open end to form a closed structure in the cylinder 1, and inlet and outlet air ports 9 for inletting and outletting air in the cylinder 1 are arranged at both ends thereof;
[0023] A piston rod 5 is arranged in the axial direction of the cylinder 1, extends into the inside of the cylinder 1 through the sealing end cap assembly 6, and a main working piston 2 and an auxiliary compensation piston 7 are coaxially arranged on the piston rod 5, and the main working piston 2 is accommodated in the cylinder 1 for piston movement in the cylinder 1.
[0024] A buffer damping cylinder 3 is arranged on the inner wall of the closed end of the cylinder 1, and is matched and connected with the auxiliary compensation piston 7.
[0025] The design adopts the buffer damping cylinder 3 cooperating with the auxiliary compensation piston 7 to form two-stage buffering in the cylinder, thereby improving the buffering effect of the pneumatic rod, avoiding damage to the connecting parts when instantaneous rigid collision occurs, and avoiding the situation that the cylinder wall is cracked, and the buffer damping cylinder 3 and the auxiliary compensation piston 7 have the effect of secondary buffering.
[0026] In the embodiment, a U-shaped connector 4 is mounted on the free end of the piston rod 5 and the closed end of the cylinder 1 respectively, and the U-shaped connector 4 is used for connecting and fixing.
[0027] In the embodiment, reference Figure 2The inner port of the buffer damping cylinder 3 is provided with a conical guide bevel 301 for guiding the auxiliary compensation piston 7. When the pneumatic rod is working, the piston rod 5 drives the auxiliary compensation piston 7 to move towards the buffer damping cylinder 3. When it approaches the inner port of the buffer damping cylinder 3, the conical guide bevel 301 can capture the movement trajectory of the auxiliary compensation piston 7 in time and accurately guide it into the buffer damping cylinder 3. Even if there is a certain deviation or shaking during the movement of the piston rod 5, the conical guide bevel 301 can automatically adjust the position and angle of the auxiliary compensation piston 7 through its unique conical structure, so that it can smoothly enter the buffer damping cylinder 3 and achieve a smooth buffering process.
[0028] In this embodiment, reference Figure 3 The main working piston 2 and the auxiliary compensation piston 7 are radially embedded with a composite sealing assembly 8 with an annular structure. This design achieves multiple functions such as high-pressure sealing, dustproof and wear-resistant, and low friction.
[0029] In this embodiment, the closed end of the cylinder 5 is hemispherical. This design can effectively disperse the internal pressure and improve the pressure resistance of the cylinder 1.
[0030] Working principle: First, gas is injected into one of the air inlets / outlets 9 and gas is discharged from the other air inlet / outlet 9, causing the main working piston 2 to move like a piston.
[0031] When the piston rod 5 is subjected to an instantaneous impact, the piston rod 5 will immediately retract into the cylinder 1. When the main working piston 2 moves as a piston, the gas in the compressed cylinder 1 forms a primary buffer. At this time, the auxiliary compensation piston 7 and the buffer damping cylinder 3 remain in a non-contact state. When it approaches the end of the stroke, the auxiliary compensation piston 7 is embedded in the corresponding buffer damping cylinder 3. At this time, a secondary buffer is formed inside the buffer damping cylinder 3.
[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.
Claims
1. A two-stage buffered double-chamber pneumatic rod, characterized in that, The cylinder (1) includes a closed end and an open end. A sealing end cap assembly (6) for sealing is disposed in the open end so that a closed structure is formed inside the cylinder (1). Air inlet and outlet ports (9) for air intake and exhaust are respectively provided at both ends of the cylinder (1). The piston rod (5) is arranged along the axial direction of the cylinder body (1), extends through the sealing end cap assembly (6) and into the interior of the cylinder body (1), and a main working piston (2) and an auxiliary compensating piston (7) are coaxially arranged on it, and the main working piston (2) is housed in the cylinder body (1) for piston movement in the cylinder body (1); The buffer damping cylinder (3) is arranged on the inner wall of the closed end of the cylinder (1) and is matched and connected with the auxiliary compensation piston (7).
2. The two-stage buffer dual-chamber pneumatic rod as described in claim 1, characterized in that: U-shaped connectors (4) are respectively installed on the free end of the piston rod (5) and the closed end of the cylinder (1).
3. The two-stage buffer dual-chamber pneumatic rod as described in claim 1, characterized in that: The inner hole of the buffer damping cylinder (3) is provided with a tapered guide bevel (301) for guiding the auxiliary compensation piston (7).
4. The two-stage buffer dual-chamber pneumatic rod as described in claim 1, characterized in that: The main working piston (2) and the auxiliary compensation piston (7) are radially embedded with a composite sealing assembly (8) with an annular structure.
5. The two-stage buffer dual-chamber pneumatic rod as described in claim 1, characterized in that: The closed end of the cylinder (1) is hemispherical.