An anti-rotation buffer cylinder

Abstract

The present invention discloses an anti-rotation buffer cylinder, which comprises a cylinder barrel, a front cover, a rear cover, a piston and a piston rod; a front exhaust port is provided on the front cover, and a rear exhaust port is provided on the rear cover; a guide rod is arranged in the cylinder barrel, and the guide rod is connected between the front cover and the rear cover. The piston is matched with the guide rod. The two ends of the guide rod are respectively provided with a front throttle channel and a rear throttle channel. The front throttle channel communicates with the front exhaust port and the inner cavity of the cylinder barrel. A front exhaust groove communicating with the front throttle channel is formed at the front end of the guide rod. The rear throttle channel communicates with the rear exhaust port and the inner cavity of the cylinder barrel. A rear exhaust groove communicating with the rear throttle channel is provided at the rear end of the guide rod; the bottom depth of the front exhaust groove gradually decreases from the rear to the front, and the bottom depth of the rear exhaust groove gradually decreases from the front to the rear. When the piston moves towards the front cover, the flow rate of the front exhaust groove gradually decreases. When the piston moves towards the rear cover, the flow rate of the rear exhaust groove gradually decreases. The present invention has the advantages of simple structure, convenient manufacturing, stable operation and good buffer effect.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic components, and particularly to an anti-rotation buffer cylinder. Background Art

[0002] Buffer cylinders are widely used in production and life, such as in printing (tension control), semiconductors (spot welders, chip grinding), automation control, robots and other fields. The buffer cylinder mainly achieves the buffering effect through the air buffering structure. For example, the buffer cylinder disclosed in Chinese Patent Application No. CN201721412875.8 includes a cylinder rod connected to a lower plug and an upper plug to form a piston. An upper air chamber is formed between the piston, the cylinder block and the upper sealing plate, and a lower air chamber is formed between the piston, the cylinder block and the lower sealing plate; sealing rings I are respectively embedded on the upper sealing plate and the lower sealing plate, and the sealing rings I are in clearance fit with the lower plug and the upper plug respectively; when the piston moves downward, the lower plug contacts the sealing ring I on the lower sealing plate, separating the lower air chamber into a first lower air chamber and a second lower air chamber, so that the cylinder rod can complete the final stage of movement at a slow speed. Although it overcomes the problem of being unable to adjust the speed of the final stage of the cylinder alone, enabling the fixture to move at a high speed for most of the stroke and slowly and stably complete the last small section of the stroke, effectively balancing the full-cycle operation time and stability, during the process of changing from high-speed movement to slow movement, the acceleration is relatively large, and there will still be impact or vibration, with poor and unstable buffering effect. Moreover, most of the cylinder rods of buffer cylinders are cylindrical. During actual use, the cylinder rod will rotate relative to the cylinder block. For high-precision or precision-level equipment, the rotation of the cylinder rod greatly affects the stable operation of the equipment. Therefore, people solve this problem by using multiple guide rods or non-cylindrical cylinder rods, but such structures are relatively complex or troublesome to manufacture. Summary of the Invention

[0003] The purpose of the present invention is to provide an anti-rotation buffer cylinder with simple structure, convenient manufacturing, stable operation and good buffering effect in view of the defects and deficiencies of the prior art.

[0004] The above technical object of the present invention is achieved by the following technical solutions: An anti-rotation buffer cylinder includes a cylinder barrel, a front cover, a rear cover, a piston and a piston rod; the front cover and the rear cover are respectively connected to both ends of the cylinder barrel, the piston rod passes through the front cover and is slidably matched with the front cover, the piston is slidably matched with the inner side wall of the cylinder barrel, the front cover and the rear cover are respectively provided with working ports communicating with the inner cavity of the cylinder barrel, the front cover is provided with a front exhaust port communicating with the inner cavity of the cylinder barrel, and the rear cover is provided with a rear exhaust port communicating with the inner cavity of the cylinder barrel; a guide rod is further provided in the cylinder barrel, the guide rod is connected between the front cover and the rear cover, the piston is slidably matched with the guide rod, the two ends of the guide rod are respectively provided with a front throttling channel and a rear throttling channel, the front throttling channel is used to communicate the front exhaust port and the inner cavity of the cylinder barrel, the front end of the guide rod is provided with a front exhaust groove communicating with the front throttling channel, the rear throttling channel is used to communicate the rear exhaust port and the inner cavity of the cylinder barrel, the rear end of the guide rod is provided with a rear exhaust groove communicating with the rear throttling channel; the bottom depth of the front exhaust groove gradually decreases from back to front, and the bottom depth of the rear exhaust groove gradually decreases from front to back. When the piston moves towards the front cover direction, the flow rate of the front exhaust groove gradually decreases, and when the piston moves towards the rear cover direction, the flow rate of the rear exhaust groove gradually decreases.

[0005] Further, both the front exhaust groove and the rear exhaust groove are wedge-shaped, and the front exhaust groove and the rear exhaust groove are symmetrically arranged along the center of the guide rod, with a simpler and more reasonable structure, which is convenient for production and manufacturing.

[0006] Further, both the front exhaust groove and the rear exhaust groove are distributed along the extending direction of the guide rod. The rear end of the front exhaust groove communicates with the front throttling channel, the front end of the front exhaust groove is close to the front cover, the front end of the rear exhaust groove communicates with the rear throttling channel, and the rear end of the rear exhaust groove is close to the rear cover.

[0007] Further, the front cover is provided with a through hole for the piston rod to pass through, and a dust-proof ring and a bearing are provided in the through hole. Both the bearing and the dust-proof ring are slidably and sealedly matched with the piston rod.

[0008] Further, a first O-ring is embedded at the connection between the front cover and the cylinder barrel, and the first O-ring is also embedded at the connection between the rear cover and the cylinder barrel.

[0009] Further, the piston is provided with a mating hole corresponding to the guide rod, the mating hole is slidably matched with the guide rod, and a second O-ring is embedded in the mating hole.

[0010] Further, a sealing ring, a magnetic ring and a wear-resistant ring are sleeved on the piston.

[0011] The beneficial effects of the present invention are as follows: First, by arranging a guide rod inside the cylinder barrel, the guide rod is connected between the front cover and the rear cover, and the piston is in sliding fit with the guide rod, so that the piston rod cannot rotate axially, solving the problem of piston rod rotation in the prior art, making the operation of the piston rod more stable and reliable, and having a simple structure and convenient manufacturing;

[0012] Second, a front throttle passage and a rear throttle passage are respectively arranged at both ends of the guide rod. The front throttle passage is used to connect the front exhaust port and the inner cavity of the cylinder barrel. A front exhaust groove communicating with the front throttle passage is arranged at the front end of the guide rod. The rear throttle passage is used to connect the rear exhaust port and the inner cavity of the cylinder barrel. A rear exhaust groove communicating with the rear throttle passage is arranged at the rear end of the guide rod; the depth of the bottom of the front exhaust groove gradually decreases from the rear to the front, and the depth of the bottom of the rear exhaust groove gradually decreases from the front to the rear. When in use, when the piston moves rapidly towards the front cover direction, after the piston approaches the front exhaust groove, the flow rate of the front exhaust groove gradually decreases, and the gas discharge rate relatively decreases, and the piston movement gradually slows down. Similarly, when the piston moves rapidly towards the rear cover direction, after the piston approaches the rear exhaust groove, the flow rate of the rear exhaust groove gradually decreases, and the gas discharge rate relatively decreases, and the piston movement gradually slows down. Thus, the problem of too large acceleration change in the prior art is solved, the movement of the piston rod relative to the cylinder barrel is stable, and the buffering effect is improved. Generally speaking, the present invention has the advantages of simple structure, convenient manufacturing, stable operation and good buffering effect. Description of the Drawings

[0013] Figure 1 is the overall structural schematic diagram of the present invention.

[0014] Figure 2 is Figure 1 the enlarged schematic diagram at A in

[0015] As shown in the figure: 1 - cylinder barrel; 2 - front cover; 21 - front exhaust port; 22 - through hole; 3 - rear cover; 31 - rear exhaust port; 4 - piston; 41 - mating hole; 5 - piston rod; 6 - guide rod; 61 - front throttle passage; 611 - front exhaust groove; 62 - rear throttle passage; 621 - rear exhaust groove; 7 - dust ring; 8 - bearing; 9 - first O-ring; 10 - second O-ring; 11 - sealing ring; 12 - magnetic ring; 13 - wear-resistant ring. Specific Embodiments

[0016] For a more intuitive and complete understanding of the technical solution of the present invention, the non-limiting feature description is as follows in combination with the drawings of the present invention:

[0017] Such as Figure 1 and Figure 2As shown in the figure, an anti-rotation buffer cylinder includes a cylinder barrel 1, a front cover 2, a rear cover 3, a piston 4 and a piston rod 5; the front cover 2 and the rear cover 3 are respectively connected to both ends of the cylinder barrel 1, the piston rod 5 passes through the front cover 2 and is slidably matched with the front cover 2, the piston 4 is slidably matched with the inner side wall of the cylinder barrel 1, and working ports (not shown in the figure) communicating with the inner cavity of the cylinder barrel 1 are respectively provided on the front cover 2 and the rear cover 3. A front exhaust port 21 communicating with the inner cavity of the cylinder barrel 1 is provided on the front cover 2, and a rear exhaust port 31 communicating with the inner cavity of the cylinder barrel 1 is provided on the rear cover 3; a guide rod 6 is further provided in the cylinder barrel 1, the guide rod 6 is connected between the front cover 2 and the rear cover 3, the piston 4 is slidably matched with the guide rod 6, and front throttle channels 61 and rear throttle channels 62 are respectively provided at both ends of the guide rod 6. The front throttle channel 61 is used to communicate the front exhaust port 21 and the inner cavity of the cylinder barrel 1, and a front exhaust groove 611 communicating with the front throttle channel 61 is provided at the front end of the guide rod 6. The rear throttle channel 62 is used to communicate the rear exhaust port 31 and the inner cavity of the cylinder barrel 1, and a rear exhaust groove 621 communicating with the rear throttle channel 62 is provided at the rear end of the guide rod 6; the groove bottom depth of the front exhaust groove 611 gradually decreases from the rear to the front, and the groove bottom depth of the rear exhaust groove 621 gradually decreases from the front to the rear. When the piston 4 moves towards the front cover 2, the flow rate of the front exhaust groove 611 gradually decreases. When the piston 4 moves towards the rear cover 3, the flow rate of the rear exhaust groove 621 gradually decreases.

[0018] Both the front exhaust groove 611 and the rear exhaust groove 621 are wedge-shaped, and the front exhaust groove 611 and the rear exhaust groove 621 are symmetrically arranged along the center of the guide rod 6.

[0019] Both the front exhaust groove 611 and the rear exhaust groove 621 are distributed along the extending direction of the guide rod 6. The rear end of the front exhaust groove 611 communicates with the front throttle channel 61, the front end of the front exhaust groove 611 is close to the front cover 2, the front end of the rear exhaust groove 621 communicates with the rear throttle channel 62, and the rear end of the rear exhaust groove 621 is close to the rear cover 3.

[0020] Specifically, in the extending direction of the guide rod 6, the lengths of both the front exhaust groove 611 and the rear exhaust groove 621 are greater than the length of the piston 4, which prevents gas leakage, ensures a stable rate of gas outflow, and makes the buffering effect better; there are two guide rods 6, which are symmetrically arranged on both sides of the piston rod 5. One of the guide rods 6 is a smooth rod, and the other adopts the structure mentioned in the present invention, which ensures the balanced force on the piston 4, makes the piston 4 move more smoothly and reliably, and further prevents the piston rod 5 from rotating.

[0021] Preferably, during normal operation, throttle valves are connected to both the front exhaust port 21 and the rear exhaust port 31 to further control the rate of gas discharge, make the gas flow out more smoothly and slowly, and ensure the buffering effect.

[0022] The front cover 2 is provided with a through hole 22 for the piston rod 5 to pass through. A dust-proof ring 7 and a bearing 8 are arranged in the through hole 22. Both the bearing 8 and the dust-proof ring 7 are in sliding seal cooperation with the piston rod 5. A first O-ring 9 is embedded at the connection between the front cover 2 and the cylinder barrel 1, and a first O-ring 9 is also embedded at the connection between the rear cover 3 and the cylinder barrel 1.

[0023] The piston 4 is provided with a mating hole 41 corresponding to the guide rod 6. The mating hole 41 is in sliding cooperation with the guide rod 6, and a second O-ring 10 is embedded in the mating hole 41. A sealing ring 11, a magnetic ring 12, and a wear-resistant ring 13 are sleeved on the piston 4. Preferably, the piston 4 is fixed to the piston rod 5 by screws.

[0024] The specific working principle of the present invention is as follows: Under normal circumstances, the piston rod 5 is in the initial position (the piston 4 is located at the rear cover 3). When the piston rod 5 needs to extend, high-pressure gas is filled into the working port on the rear cover 3, causing the piston 4 to move rapidly in the direction of the front cover 2. At this time, the outer circumferential surface of the piston 4 slides relative to the inner side wall of the cylinder barrel 1, and the mating hole 41 on the piston 4 slides relative to the guide rod 6. Before the piston 4 reaches the front exhaust groove 611, the opening degree of the front exhaust groove 611 remains unchanged, and the piston 4 always maintains high-speed movement. When the piston 4 moves to the position of the front exhaust groove 611, the piston 4 begins to gradually close the front exhaust groove 611. Since the groove bottom depth of the front exhaust groove 611 gradually decreases from the rear to the front, and the front exhaust groove 611 is distributed along the extension direction of the guide rod 6, the front end of the front exhaust groove 611 is connected to the front throttling channel 61, and the rear end of the front exhaust groove 611 is close to the front cover 2, so that the flow rate of the front exhaust groove 611 gradually decreases, the gas discharge rate gradually decreases, and the movement of the piston 4 gradually slows down from high speed until the discharged gas stops moving. Similarly, when the piston 4 needs to move in the direction of the rear cover 3, high-pressure gas is filled into the working port on the front cover 2, causing the piston 4 to move rapidly in the direction of the rear cover 3. At this time, the piston 4 slides relative to the cylinder barrel 1 and the guide rod 6. Before the piston 4 reaches the rear exhaust groove 621, the opening degree of the rear exhaust groove 621 remains unchanged, and the piston 4 always maintains high-speed movement. When the piston 4 moves to the position of the rear exhaust groove 621, the piston 4 begins to gradually close the rear exhaust groove 621. Since the groove bottom depth of the rear exhaust groove 621 gradually decreases from the front to the rear, and the rear exhaust groove 621 is distributed along the extension direction of the guide rod 6, the front end of the rear exhaust groove 621 is connected to the rear throttling channel 62, and the rear end of the rear exhaust groove 621 is close to the rear cover 3, so that the opening degree of the rear exhaust groove 621 gradually decreases, the gas discharge rate gradually decreases, and the movement of the piston 4 gradually slows down from high speed until the discharged gas stops moving. This ensures that when the piston rod 5 extends or retracts, a better buffering effect can be achieved, and the rotation of the piston rod 5 is prevented.

[0025] The above are only the preferred embodiments of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A rotation-proof buffer cylinder, comprising a cylinder barrel (1), a front cover (2), a rear cover (3), a piston (4) and a piston rod (5); the front cover (2) and the rear cover (3) are respectively connected to two ends of the cylinder barrel (1), the piston rod (5) passes through the front cover (2) and is in sliding fit with the front cover (2), the piston (4) is in sliding fit with the inner side wall of the cylinder barrel (1), working ports communicating with the inner cavity of the cylinder barrel (1) are respectively opened on the front cover (2) and the rear cover (3), a front exhaust port (21) communicating with the inner cavity of the cylinder barrel (1) is opened on the front cover (2), and a rear exhaust port (31) communicating with the inner cavity of the cylinder barrel (1) is opened on the rear cover (3); It is characterized in that: A guide rod (6) is further arranged in the cylinder barrel (1), the guide rod (6) is connected between the front cover (2) and the rear cover (3), the piston (4) is in sliding fit with the guide rod (6), front throttle channels (61) and rear throttle channels (62) are respectively opened at two ends of the guide rod (6), the front throttle channel (61) is used for communicating the front exhaust port (21) and the inner cavity of the cylinder barrel (1), a front exhaust groove (611) communicating with the front throttle channel (61) is opened at the front end of the guide rod (6), the rear throttle channel (62) is used for communicating the rear exhaust port (31) and the inner cavity of the cylinder barrel (1), and a rear exhaust groove (621) communicating with the rear throttle channel (62) is opened at the rear end of the guide rod (6); The groove bottom depth of the front exhaust groove (611) gradually decreases from the rear to the front, and the groove bottom depth of the rear exhaust groove (621) gradually decreases from the front to the rear. When the piston (4) moves towards the front cover (2), the flow rate of the front exhaust groove (611) gradually decreases. When the piston (4) moves towards the rear cover (3), the flow rate of the rear exhaust groove (621) gradually decreases.

2. The anti-rotation buffer cylinder according to claim 1, wherein: Both the front exhaust groove (611) and the rear exhaust groove (621) are wedge-shaped, and the front exhaust groove (611) and the rear exhaust groove (621) are symmetrically arranged along the center of the guide rod (6).

3. The anti-rotation buffer cylinder according to claim 2, characterized in that: Both the front exhaust groove (611) and the rear exhaust groove (621) are distributed along the extending direction of the guide rod (6). The rear end of the front exhaust groove (611) is communicated with the front throttle channel (61), the front end of the front exhaust groove (611) is close to the front cover (2), the front end of the rear exhaust groove (621) is communicated with the rear throttle channel (62), and the rear end of the rear exhaust groove (621) is close to the rear cover (3).

4. The anti-rotation buffer cylinder according to claim 1, characterized in that: The front cover (2) is provided with a through hole (22) for the piston rod (5) to pass through, and a dust-proof ring (7) and a bearing (8) are arranged in the through hole (22). Both the bearing (8) and the dust-proof ring (7) are in sliding and sealing fit with the piston rod (5).

5. The anti-rotation buffer cylinder according to claim 4, characterized in that: A first O-ring (9) is embedded at the connection between the front cover (2) and the cylinder barrel (1), and the first O-ring (9) is also embedded at the connection between the rear cover (3) and the cylinder barrel (1).

6. The anti-rotation buffer cylinder according to claim 1, characterized in that: A mating hole (41) corresponding to the guide rod (6) is formed in the piston (4). The mating hole (41) is in sliding fit with the guide rod (6), and a second O-ring (10) is embedded in the mating hole (41).

7. The anti-rotation buffer cylinder according to claim 6, characterized in that: A sealing ring (11), a magnetic ring (12) and a wear-resistant ring (13) are sleeved on the piston (4).

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