A return stroke buffer three-chamber high-speed oil cylinder

Abstract

The utility model discloses a kind of back stroke buffer three-cavity high-speed oil cylinder, it relates to hydraulic cylinder technical field, it includes outer cylinder body, further include piston rod;Lower end opening cavity is provided in outer cylinder body inside, and the upper end inner top wall of cavity is provided with the recess portion of taper;Piston rod is inserted in the cavity of outer cylinder body from bottom to top, and the upper end of piston rod is provided with the taper body compatible with recess portion;When piston rod is quickly back to end up, taper body inserts recess portion, part of oil enters recess portion and forms oil buffer pad, and applies reverse pressure to piston rod.The utility model, by optimizing the design structure inside oil cylinder, when piston rod runs to the top of outer cylinder body, using the taper body of the upper end of piston rod and the cooperation of outer cylinder body, a part of hydraulic oil is pre-sealed into recess, play the role of buffer pad, avoid piston rod impact outer cylinder body.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a return-buffered three-chamber high-speed hydraulic cylinder. Background Technology

[0002] In the field of hydraulic cylinder technology, high-speed cylinders are widely used in machine tools, construction machinery, and other equipment. Their return performance directly affects the efficiency and lifespan of the equipment. In existing technologies, when the piston rod of a traditional hydraulic cylinder rapidly returns to the bottom of the cylinder, due to inertia, the piston rod often impacts the bottom of the cylinder body at high speed (e.g., 2 m / s), leading to the following problems: 1. Impacts can generate tremendous force, causing cylinder deformation, seal failure, or piston rod wear, which can lead to oil leaks or equipment malfunctions.

[0003] 2. When relying on an external relief valve for buffering, the valve body reacts slowly and cannot promptly offset the kinetic energy of the high-speed return stroke. The damage rate of the hydraulic cylinder is highly dependent on the performance of the relief valve, but the valve body is susceptible to oil contamination or aging, resulting in low reliability.

[0004] 3. This type of hydraulic cylinder is a core component of the machine tool. Each time it is damaged, it needs to be replaced or repaired, which is costly and causes long downtime, affecting production efficiency. Utility Model Content

[0005] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a return-flow buffer three-chamber high-speed hydraulic cylinder. By optimizing the internal design structure of the cylinder, when the piston rod reaches the top of the outer cylinder, a portion of hydraulic oil is pre-sealed into the groove by utilizing the conical surface of the upper end of the piston rod that mates with the outer cylinder, thus acting as a buffer pad to prevent the piston rod from impacting the outer cylinder.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a return-stroke buffer three-chamber high-speed hydraulic cylinder, including an outer cylinder body and a piston rod; the outer cylinder body has a cavity with an opening at the lower end, and the upper inner wall of the cavity has a conical groove; the piston rod is inserted into the cavity of the outer cylinder body from bottom to top, and the upper end of the piston rod has a conical surface that matches the groove; when the piston rod rapidly returns upward to its end, the conical surface inserts into the groove, and some oil enters the groove to form an oil buffer pad, applying reverse pressure to the piston rod.

[0007] A further improvement is that a piston body is provided on the outside of the piston rod, which divides the cavity into an upper first oil chamber and a lower second oil chamber.

[0008] A further improvement is that: a first oil port communicating with the first oil chamber is provided near the upper end of the outer cylinder sidewall, and a second oil port communicating with the second oil chamber is provided near the lower end of the outer cylinder sidewall.

[0009] A further improvement is that the first oil port is located below the groove.

[0010] Further improvements include: an inner cylinder body; the piston rod includes a rod body, the inside of which is provided with a chamber with an upper opening; the inner cylinder body includes a tube body disposed within the chamber, and a third oil chamber is formed between the lower end of the tube body and the bottom wall of the chamber; the upper end of the tube body extends from the upper opening of the chamber and passes through the upper end of the outer cylinder body, and a first oil passage for connecting the third oil chamber is formed inside the tube body.

[0011] A further improvement is that a second oil passage is formed between the outer wall of the tube body and the inner wall of the chamber to connect the first oil chamber and the third oil chamber.

[0012] A further improvement is that a sealing ring adapted to the piston rod is provided at the lower opening of the outer cylinder body, and a through hole adapted to the tube body is provided at the upper end of the outer cylinder body.

[0013] A further improvement is that the upper opening of the through hole is expanded outward to form a limiting groove, and the upper end of the tube body is provided with a limiting boss that matches the limiting groove.

[0014] A further improvement is that the upper end of the tube is flush with the upper end of the outer cylinder.

[0015] A further improvement is that a joint is provided at the lower end of the rod.

[0016] The beneficial effects of this utility model are as follows: 1. In this invention, the conical surface at the upper end of the piston rod mates with the conical groove at the top of the outer cylinder, forming a progressive seal at the end of the return stroke. When the piston rod moves rapidly upward, the conical surface inserts into the groove, trapping some oil within it to form an oil buffer pad. This design utilizes the incompressibility of the oil to generate reverse pressure, gradually slowing the piston rod and preventing hard impacts. Compared to an external relief valve, this internal buffer responds faster and does not rely on external components, reducing the failure rate.

[0017] 2. In this utility model, the hydraulic cylinder adopts a three-chamber structure, with the oil passages divided by the piston body and the inner cylinder body. This structural design results in a small cross-section of the first oil chamber, allowing for rapid downward movement during oil injection; the third oil chamber switches to pressurized oil during pressurization, improving working efficiency. The second oil passage E connects the first and third oil chambers, ensuring smooth oil flow, reducing the impact of hydraulic fluctuations, and maintaining stability of the hydraulic cylinder during high-speed operation, making it suitable for high-frequency working scenarios.

[0018] 3. By reducing impact losses, this utility model significantly extends the life of the hydraulic cylinder and reduces the frequency of maintenance. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the return buffer three-chamber high-speed hydraulic cylinder in the embodiment of this utility model; Figure 2 for Figure 1 Sectional view along the middle AA direction; Figure 3 This is a schematic diagram of the structure of the oil buffer pad in an embodiment of this utility model; Figure 4 This is a schematic diagram of the outer cylinder body in an embodiment of the present invention; Figure 5 This is a schematic diagram of the inner cylinder body in an embodiment of the present utility model; Figure 6 This is a schematic diagram of the piston rod in an embodiment of the present invention.

[0020] Figure label: 1-Outer cylinder body; 11-Sealing ring; 12-Cavity; 13-First oil port; 14-Second oil port; 15-Through hole; 16-Groove; 17-Limiting groove; 2-inner cylinder; 21-pipe body; 22-limiting boss; 3-Piston rod; 31-Rod body; 32-Piston body; 33-Cavity; 34-Conical body; 35-Joint; A - First oil chamber; B - Second oil chamber; C - Third oil chamber; D - First oil passage; E - Second oil passage; F - Oil buffer pad. Detailed Implementation

[0021] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0022] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. They should not be construed as limiting the specific protection scope of this utility model.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0024] The following description, in conjunction with the accompanying drawings, further illustrates specific embodiments of the present invention, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0025] See Figures 1-6 As shown, this utility model embodiment provides a return-buffered three-chamber high-speed hydraulic cylinder, including an outer cylinder body 1 and a piston rod 3.

[0026] See Figure 4 As shown, the outer cylinder 1 has a cavity 12 with an opening at the lower end, and the upper inner wall of the cavity 12 has a conical groove 16. Specifically, the lower opening of the outer cylinder 1 is provided with a sealing ring 11 that matches the piston rod 3, and the upper end of the outer cylinder 1 is provided with a through hole 15 that matches the tube 21.

[0027] See Figure 6 As shown, the piston rod 3 is inserted into the cavity 12 of the outer cylinder 1 from bottom to top, and the upper end of the piston rod 3 is provided with a conical surface 34 that matches the groove portion 16; the piston rod 3 includes a rod body 31, and the interior of the rod body 31 is provided with a chamber 33 with an opening at the upper end; specifically, the lower end of the rod body 31 is provided with a connector portion 35.

[0028] See Figure 3 As shown, when the piston rod 3 rapidly returns to its end (the return speed can reach 2m / s), the conical body 34 inserts into the groove 16, and some oil enters the groove 16 to form an oil buffer pad F, which applies reverse pressure to the piston rod 3.

[0029] See Figure 2 As shown, a piston body 32 is provided on the outer side of the piston rod 3, which divides the interior of the cavity 12 into an upper first oil chamber A and a lower second oil chamber B. A first oil port 13 communicating with the first oil chamber A is provided near the upper end of the side wall of the outer cylinder 1, and a second oil port 14 communicating with the second oil chamber B is provided near the lower end of the side wall of the outer cylinder 1. Specifically, the first oil port 13 is located below the recessed portion 16.

[0030] See Figure 2 and Figure 5As shown, the return-flow buffer three-chamber high-speed hydraulic cylinder also includes an inner cylinder body 2; the inner cylinder body 2 includes a tube 21 disposed within a chamber 33, and a third oil chamber C is formed between the lower end of the tube 21 and the inner bottom wall of the chamber 33; the upper end of the tube 21 extends from the upper opening of the chamber 33 and passes through the upper end of the outer cylinder body 1, and a first oil passage D is formed inside the tube 21 to connect the third oil chamber C. Specifically, a second oil passage E is formed between the outer side wall of the tube 21 and the inner side wall of the chamber 33 to connect the first oil chamber A and the third oil chamber C. The upper opening of the through hole 15 is expanded outward to form a limiting groove 17, and a limiting boss 22 adapted to the limiting groove 17 is provided at the upper end of the tube 21. The upper end of the tube 21 is flush with the upper end of the outer cylinder body 1.

[0031] The working principle of this utility model is as follows: When the piston rod moves downward, oil is first injected into the first oil chamber through the first oil port. Since the cross-section of this oil chamber is very small, it can move downward quickly with the same flow rate. At the same time, the third oil chamber is filled with liquid. When pressurization is required, the third oil chamber switches to pressurized oil to apply pressure.

[0032] When the piston rod returns rapidly to its end, the conical surface at the upper end of the piston rod forms a seal (not a complete seal) with the corresponding groove in the outer cylinder, creating reverse pressure and thus acting as a buffer.

[0033] In the description of this specification, references to terms such as "an embodiment," "preferred," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. Illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Based on the above description of the structure and principle, those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. Improvements and substitutions based on this utility model using techniques known in the art all fall within the protection scope of this utility model and should be defined by the claims.

Claims

1. A return-stroke buffer three-chamber high-speed hydraulic cylinder, comprising an outer cylinder body (1), characterized in that: It also includes the piston rod (3); The outer cylinder (1) has a cavity (12) with an opening at the lower end, and the inner top wall of the upper end of the cavity (12) has a conical groove (16). The piston rod (3) is inserted into the cavity (12) of the outer cylinder (1) from bottom to top, and the upper end of the piston rod (3) is provided with a conical body (34) that is compatible with the groove (16). When the piston rod (3) returns rapidly upward to the end, the conical body (34) inserts into the groove (16), and some oil enters the groove (16) to form an oil buffer pad (F), which applies reverse pressure to the piston rod (3).

2. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 1, characterized in that: A piston body (32) is provided on the outside of the piston rod (3), which divides the cavity (12) into an upper first oil chamber (A) and a lower second oil chamber (B).

3. The high-speed hydraulic cylinder with return buffer in three chambers according to claim 2, characterized in that: The outer cylinder body (1) has a first oil port (13) near the upper end of its side wall, which communicates with the first oil chamber (A), and a second oil port (14) near the lower end of its side wall, which communicates with the second oil chamber (B).

4. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 3, characterized in that: The first oil port (13) is located below the groove (16).

5. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 3, characterized in that: It also includes the inner cylinder (2); The piston rod (3) includes a rod body (31), and the interior of the rod body (31) is provided with a chamber (33) with an opening at the upper end. The inner cylinder (2) includes a tube (21) disposed in the chamber (33), and a third oil chamber (C) is formed between the lower end of the tube (21) and the bottom wall of the chamber (33); the upper end of the tube (21) extends from the upper opening of the chamber (33) and passes through the upper end of the outer cylinder (1), and a first oil passage (D) is formed inside the tube (21) for connecting the third oil chamber (C).

6. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 5, characterized in that: A second oil passage (E) is formed between the outer wall of the tube (21) and the inner wall of the chamber (33) to connect the first oil chamber (A) and the third oil chamber (C).

7. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 5, characterized in that: The lower end of the outer cylinder (1) is provided with a sealing ring (11) that is compatible with the piston rod (3), and the upper end of the outer cylinder (1) is provided with a through hole (15) that is compatible with the tube (21).

8. The three-chamber high-speed hydraulic cylinder with return buffer according to claim 7, characterized in that: The upper opening of the through hole (15) is expanded to form a limiting groove (17), and the upper end of the tube body (21) is provided with a limiting boss (22) that matches the limiting groove (17).

9. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 5, characterized in that: The upper end of the tube (21) is flush with the upper end of the outer cylinder (1).

10. The return-flow buffer three-chamber high-speed hydraulic cylinder according to claim 5, characterized in that: The lower end of the rod (31) is provided with a joint (35).

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