A cylinder structure for punch vibration simulation

Abstract

The utility model discloses a kind of oil cylinder structures for stamping vibration simulation, including upper end cap assembly, lower end cap assembly and the cylindrical cylinder body connecting both, piston working cavity is defined together;Piston assembly, in the piston working cavity, including piston rod and the punch adapter seat fixed in the end of piston rod;Buffer structure, including by the plunger boss of piston rod bottom and the valve sleeve groove cooperation of lower end cap assembly and form main buffer oil cavity, the main buffer oil cavity is connected external hydraulic system by the radial oil inlet hole on lower end cap assembly.The utility model generates damping effect by main buffer oil cavity cooperation high pressure relief channel, absorbs impact energy;Floating isolation ring compresses gas in annular air pressure chamber, to convert energy into the reset power of floating isolation ring, realize the closure of high pressure relief channel;High pressure oil liquid promotes isolation blade mouth to realize floating isolation ring upshift, floating isolation ring is reset by damper flange again, realizes self-adapting reset.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, and in particular to a cylinder structure for simulating stamping vibration. Background Technology

[0002] Large stamping presses experience instantaneous impacts of hundreds of tons during operation. These massive impact loads lead to fatigue cracks in the machine mechanism, loosening of connecting parts, and other problems. Furthermore, the impact vibrations can affect the machining accuracy of workpieces. Therefore, reducing the impact of stamping shocks on equipment is a major challenge. Analyzing the causes and hazards of stamping shocks on large equipment requires simulation experiments to reproduce the stamping impact process. However, existing stamping vibration simulation technologies suffer from the following problems: deficiencies in the buffer system, making it difficult to effectively absorb high-frequency impact energy, resulting in residual vibrations being transmitted to the machine frame; insufficient dynamic response, with the reset mechanism relying on an external hydraulic system, resulting in a large response delay and failing to meet the rapid reset requirements of continuous stamping.

[0003] Therefore, there is an urgent need for a structure for simulating stamping vibration, in order to provide a simulation platform with high simulation efficiency, low energy consumption, and long lifespan. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a hydraulic cylinder structure for simulating stamping vibration.

[0005] The technical solution of this utility model includes:

[0006] The upper end cap assembly, the lower end cap assembly, and the cylindrical cylinder connecting the two together define the piston working chamber;

[0007] A piston assembly, disposed within the piston working chamber, includes a piston rod and a punch adapter fixed to the end of the piston rod;

[0008] The buffer structure includes a main buffer oil chamber formed by the engagement of a plunger boss at the bottom of the piston rod and a valve sleeve groove on the lower end cap assembly. The main buffer oil chamber is connected to an external hydraulic system through a radial oil inlet hole on the lower end cap assembly.

[0009] A further technical solution is that the limiting step surface of the plunger boss has a high-pressure relief channel between it and the lower end cap assembly.

[0010] A further technical solution is as follows: an annular air pressure chamber is provided between the piston rod and the cylindrical cylinder, and a floating isolation ring is provided in the annular air pressure chamber. The radial inner circumference and radial outer circumference of the floating isolation ring are respectively matched with the outer circumferential guide surface of the piston rod and the inner wall surface of the cylindrical cylinder. The lower end of the floating isolation ring is provided with a downwardly extending isolation cutting edge. In the initial state, the isolation cutting edge closes the high pressure relief channel.

[0011] A further technical solution is that the floating isolation ring, the cylindrical cylinder and the lower end cover assembly together define a low-pressure oil return chamber, which is connected to an external oil tank through an axial oil return hole.

[0012] A further technical solution is as follows: the outer peripheral guide surface of the piston rod is provided with a radially extending damping flange; when the oil pressure of the high pressure relief channel acts on the isolation blade, the floating isolation ring moves upward and pushes the lower limit surface of the damping flange, driving the piston rod to reset until the upper limit surface of the damping flange abuts against the lower stop surface of the upper end cover assembly.

[0013] A further technical solution is that the floating isolation ring is provided with a first sealing component and a second sealing component on its radial inner circumferential side and radial outer circumferential side, respectively.

[0014] A further technical solution is that the first sealing assembly includes a matching back support ring and a first sealing ring, wherein the back support ring is used to prevent the first sealing ring from undergoing plastic deformation and to provide rigid support.

[0015] A further technical solution is that a sealing and protection component is provided between the upper end cap assembly and the piston rod, and the sealing and protection component includes a main sealing ring for forming a dynamic sealing interface.

[0016] A further technical solution is that the sealing and protection assembly also includes a dustproof oil seal for isolating external particles.

[0017] A further technical solution is that the sealing and protection assembly also includes a wear-resistant ring for providing radial support and motion guidance to the piston rod.

[0018] The beneficial technical effects of this invention are as follows: The main buffer oil chamber, in conjunction with the high-pressure relief channel, generates a damping effect to absorb impact energy; simultaneously, the floating isolation ring compresses the gas within the annular pneumatic chamber, converting energy into the reset power of the floating isolation ring, thus closing the high-pressure relief channel; the high-pressure oil pushes the isolation blade to move the floating isolation ring upwards, and the floating isolation ring then drives the piston rod to reset via the damping flange, achieving adaptive reset. This structure can also adapt to the stamping simulation requirements of different tonnages by adjusting the initial pressure of the annular pneumatic chamber and the inlet pressure of the main buffer oil chamber, exhibiting good compatibility. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is an exploded view of the overall structure of the utility model;

[0021] Figure 3 This is a schematic diagram showing the position of the piston assembly in the stamping state of this utility model;

[0022] Figure 4 This is a schematic diagram showing the position of the piston assembly in the reset state of this utility model;

[0023] The components include: 1. Upper end cap assembly; 2. Lower end cap assembly; 21. Valve sleeve groove; 22. Radial oil inlet hole; 23. Annular valve seat; 24. Axial oil return hole; 3. Cylindrical cylinder body; 4. Piston rod; 41. Plunger boss; 42. Limiting step surface; 43. Damping flange; 431. Upper limit surface; 432. Lower limit surface; 5. Punch adapter seat; 6. Dustproof oil seal; 7. Main sealing ring; 8. Wear-resistant ring; 9. Annular air pressure chamber; 10. Main buffer oil chamber; 11. High pressure relief channel; 12. Floating isolation ring; 121. Isolation cutting edge; 13. Low pressure return oil chamber; 14. First sealing assembly; 15. Second sealing assembly. Detailed Implementation

[0024] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] like Figure 1 and Figure 2 As shown, the present invention discloses a hydraulic cylinder structure for simulating stamping vibration, comprising an upper end cover assembly 1, a lower end cover assembly 2, and a cylindrical cylinder body 3; the upper end cover assembly 1 and the lower end cover assembly 2 are axially fixedly connected by high-strength connecting bolts; the two ends of the cylindrical cylinder body 3 form a sealing fit with the upper end cover assembly 1 and the lower end cover assembly 2 respectively, together constituting a piston working chamber; a piston assembly that slides axially is provided inside the piston working chamber.

[0026] The piston assembly includes a piston rod 4 and a punch adapter 5. The piston rod 4 forms a flange-type end face along its axial end. The punch adapter 5 is fixedly connected to the flange-type end face by high-strength fasteners, and its outline projection area is similar to the area of ​​the flange-type end face of the piston rod 4. The top working surface of the punch adapter 5 constitutes the impact contact surface of the stamping die to simulate the impact force of the die on the workpiece during the actual stamping process.

[0027] Furthermore, a sealing and protective assembly is provided on the mating end face between the upper end cap assembly 1 and the piston rod 4. The sealing and protective assembly includes, in sequence, a dustproof oil seal 6, a main sealing ring 7, and a wear-resistant ring 8. The dustproof oil seal 6 is used to effectively prevent external particles from entering the piston working chamber. The main sealing ring 7 ensures that a dynamic sealing interface is formed when the piston rod 4 slides axially, so that the cylinder structure can work reliably under high pressure and high frequency impact conditions, and extend the service life of the cylinder structure. The wear-resistant ring 8 provides radial support for the piston rod 4 and plays a role in precision motion guidance, while better maintaining the mating clearance between it and the piston rod 4.

[0028] It also includes a buffer structure, which includes an annular air pressure chamber 9 formed between the piston rod 4 and the cylindrical cylinder 3. The annular air pressure chamber 9 is connected to an external air source through several air pressure through holes opened on the cylindrical cylinder 3. A floating isolation ring 12 is provided inside the annular air pressure chamber 9.

[0029] like Figure 3 and Figure 4 The buffer structure also includes a main buffer oil chamber 10, which is formed by the piston boss 41 at the bottom of the piston rod 4 and the valve sleeve groove 21 corresponding to the lower end cover assembly 2. Its volume changes dynamically with the stroke of the piston rod 4. The main buffer oil chamber 10 is connected to the external hydraulic system through the radial oil inlet hole 22 opened on the lower end cover assembly 2.

[0030] A high-pressure relief channel 11 is formed between the lower end cap assembly 2 and the end face opposite to the limiting step surface 42 of the plunger boss 41.

[0031] The lower end of the floating isolation ring 12 is provided with a downwardly extending isolation blade 121. In the initial state, the piston rod is reset, and the isolation blade 121 abuts against the lower end cover assembly 2 under the action of air pressure in the annular air pressure chamber 9 to close the high pressure relief channel 11. Specifically, the lower end cover assembly 2 is provided with a protruding annular valve seat 23. When the isolation blade 121 abuts against the annular valve seat 23, the high pressure relief channel 11 is closed. At this time, the floating isolation ring 12, the lower end cover assembly 2, and the cylindrical cylinder 3 together define the low pressure return oil chamber 13. The low pressure return oil chamber 13 is connected to the external oil tank through the axial return oil hole 24. In this embodiment, multiple sets of axial return oil holes 24 are provided, and the multiple sets of axial return oil holes 24 are evenly distributed along the outer periphery of the annular valve seat 23.

[0032] During the impact state, as the piston rod 4 moves downward until the limiting step surface 42 abuts against the annular valve seat 23, the high-pressure oil acts on the isolation cutting edge 121. Under the action of the high-pressure oil, the floating isolation ring 12 moves upward to open the high-pressure relief channel 11.

[0033] The floating isolation ring 12 has at least two axially spaced first sealing components 14 on its radial inner circumference side. The first sealing components 14 and the outer circumferential guide surface of the piston rod 4 form a main sealing pair. The floating isolation ring 12 has a second sealing component 15 on its radial outer circumference side. The second sealing component 15 and the inner wall surface of the cylindrical cylinder 3 form an auxiliary sealing pair. This ensures that the annular air pressure chamber 9 and the low-pressure return oil chamber 13 are isolated from each other, avoiding mutual leakage of media that could lead to performance failure.

[0034] In this embodiment, the first sealing component 14 includes a back support ring and a first sealing ring that are configured to cooperate with each other. The back support ring is used to prevent the first sealing ring from undergoing plastic deformation and to provide rigid support for the first sealing ring.

[0035] In this embodiment, a radially extending damping flange 43 is integrated on the outer peripheral guide surface of the piston rod 4. The damping flange 43 has an upper limit surface 431 and a lower limit surface 432. The upper limit surface 431 abuts against the lower stop surface of the upper end cap assembly 1 in the initial state; the lower limit surface 432 abuts against the upper pressure surface of the floating isolation ring 12 during the impact stroke.

[0036] During operation, under the impact of the punch, the piston rod 4 moves downward and compresses the oil in the main buffer oil chamber 10, causing the oil pressure to rise sharply. This generates a damping effect through the high-pressure relief channel 11, absorbing the impact energy and slowing down the downward speed of the piston rod 4 to avoid rigid collisions. The volume of the main buffer oil chamber 10 changes with the stroke of the piston rod 4. Combined with the oil replenishment mechanism of the external hydraulic system, the buffering force can be flexibly adjusted to adapt to different stamping vibration simulation requirements.

[0037] Meanwhile, the structure can be adapted to the stamping simulation requirements of different tonnages by adjusting the initial pressure of the annular air pressure chamber 9 and the oil inlet pressure of the main buffer oil chamber 10.

[0038] The sudden increase in oil pressure acts on the isolation edge 121 of the floating isolation ring 12 along the high-pressure relief channel 11, pushing the floating isolation ring 12 upward and simultaneously driving the piston rod 4 upward to reset via the lower limit surface 432 of the damping flange 43. At this time, the volume of the annular pneumatic chamber 9 decreases and the air pressure increases, forming a reaction force that pushes the floating isolation ring 12 downward to contact the isolation edge 121 and the annular valve seat 23, forming a pneumatic pressure balance reset. The low-pressure oil is then returned to the oil tank through the axial return oil hole 24, completing the buffer cycle. This structure realizes high-frequency, high-load impact action, replicating the vibration frequency and impact force characteristics of the stamping equipment.

[0039] This hydraulic cylinder structure can not only accurately reproduce the impact force, frequency and vibration characteristics of the real stamping process, but also reduce equipment wear through buffering and energy management mechanisms, providing a high-simulation, low-energy-consumption and long-life simulation platform for stamping process research and development, mold performance testing and vibration reliability testing.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A ram structure for punch vibration simulation, characterized by: include: The upper end cap assembly (1), the lower end cap assembly (2), and the cylindrical cylinder (3) connecting the two together define the piston working chamber; The piston assembly is located in the piston working chamber and includes a piston rod (4) and a punch adapter seat (5) fixed to the end of the piston rod (4). The buffer structure includes a main buffer oil chamber (10) formed by the engagement of the plunger boss (41) at the bottom of the piston rod (4) and the valve sleeve groove (21) of the lower end cap assembly (2). The main buffer oil chamber (10) is connected to an external hydraulic system through a radial oil inlet hole (22) on the lower end cap assembly (2).

2. A ram structure for punch vibration simulation according to claim 1, characterized in that: The limiting step surface (42) of the plunger boss (41) has a high pressure relief channel (11) between it and the lower end cap assembly (2).

3. A ram structure for use in punch vibration simulation according to claim 2, characterized in that: An annular air pressure chamber (9) is provided between the piston rod (4) and the cylindrical cylinder (3). A floating isolation ring (12) is provided in the annular air pressure chamber (9). The radial inner circumference and radial outer circumference of the floating isolation ring (12) are respectively matched with the outer circumferential guide surface of the piston rod (4) and the inner wall surface of the cylindrical cylinder (3). The lower end of the floating isolation ring (12) is provided with a downwardly extending isolation blade (121). In the initial state, the isolation blade (121) closes the high pressure relief channel (11).

4. A ram structure for use in punch vibration simulation according to claim 3, characterized in that: The floating isolation ring (12), the cylindrical cylinder (3) and the lower end cover assembly (2) together define the low-pressure return oil chamber (13), which is connected to the external oil tank through the axial return oil hole (24).

5. The ram structure for punch vibration simulation of claim 3, wherein: The outer peripheral guide surface of the piston rod (4) is provided with a radially extending damping flange (43); when the oil pressure of the high pressure relief channel (11) acts on the isolation blade (121), the floating isolation ring (12) moves up and pushes the lower limit surface (432) of the damping flange (43), driving the piston rod (4) to reset until the upper limit surface (431) of the damping flange (43) abuts against the lower stop surface of the upper end cover assembly (1).

6. The cylinder structure for simulating stamping vibration according to claim 3, characterized in that: The floating isolation ring (12) has a first sealing component (14) on its radial inner circumference side, and the first sealing component (14) and the outer circumferential guide surface of the piston rod (4) form a main sealing pair; the floating isolation ring (12) has a second sealing component (15) on its radial outer circumference side, and the second sealing component (15) and the inner wall surface of the cylindrical cylinder (3) form an auxiliary sealing pair.

7. A hydraulic cylinder structure for simulating stamping vibration according to claim 6, characterized in that: The first sealing assembly (14) includes a matching back support ring and a first sealing ring, wherein the back support ring is used to prevent the first sealing ring from undergoing plastic deformation and to provide rigid support.

8. The cylinder structure for simulating stamping vibration according to claim 1, characterized in that: A sealing and protective assembly is provided between the upper end cap assembly (1) and the piston rod (4), the sealing and protective assembly including a main sealing ring (7) for forming a dynamic sealing interface.

9. A hydraulic cylinder structure for simulating stamping vibration according to claim 8, characterized in that: The sealing and protection assembly also includes a dustproof oil seal (6) for isolating external particles.

10. A hydraulic cylinder structure for simulating stamping vibration according to claim 8, characterized in that: The sealing and protective assembly also includes a wear-resistant ring (8) for providing radial support and motion guidance to the piston rod (4).

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