Hydraulic buffer

Abstract

The utility model discloses a hydraulic buffer which comprises an outer pipe and an inner pipe fixedly installed in the outer pipe, an end cover is arranged at one end of the outer pipe, a base is arranged at the other end of the outer pipe, a piston is movably arranged in the inner pipe, a piston rod is installed on the piston, and one end of the piston rod penetrates through the end cover and extends to the outer side of the outer pipe. A contraction part is integrally formed at the bottom of the piston rod, a guide hole is formed between the piston rod and the contraction part, a guide rod is fixedly connected to the bottom of the inner wall of the inner pipe, the guide rod is movably inserted into the guide hole, a second spring is installed between the guide rod and the piston rod and located in the guide hole, and the outer side of the contraction part is sleeved with a pressing frame; according to the hydraulic buffer disclosed by the utility model, the piston rod can be guided through the arranged guide rod, so that the condition of unbalanced displacement of the piston rod is greatly reduced, a good buffer effect of the hydraulic buffer is ensured, and the service life of the hydraulic buffer is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of buffers, in particular to a hydraulic buffer. Background Art

[0002] A hydraulic buffer is a mechanical shock-absorbing device that uses the principle of hydraulic damping to buffer and decelerate an object acting on it until it stops. Its main function is to slow down, transfer or eliminate the vibration and impact force caused by the impact force or mass change in the mechanical system, thereby improving the stability and service life of the mechanical equipment.

[0003] The existing hydraulic buffer has a weak guiding effect on the piston rod. After long-term use, the piston rod is prone to displacement imbalance. The displacement imbalance of the piston rod will not only cause the hydraulic oil in the hydraulic buffer to be unable to be evenly distributed and effectively absorb energy when being impacted, resulting in a significant reduction in the buffering effect, but also cause other components inside the hydraulic buffer to be subjected to uneven forces, thereby accelerating the wear and aging of the components and reducing their service life. Content of the Utility Model

[0004] The purpose of the utility model is to provide a hydraulic buffer to solve the problems put forward in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A hydraulic buffer, including an outer tube and an inner tube fixedly installed inside the outer tube. One end of the outer tube is provided with an end cap, and the other end of the outer tube is provided with a base. A piston is movably arranged inside the inner tube. A piston rod is installed on the piston. One end of the piston rod passes through the end cap and extends to the outside of the outer tube. A contraction part is integrally formed at the bottom of the piston rod. A guiding hole is arranged between the piston rod and the contraction part. A guiding rod is fixedly connected to the bottom of the inner tube wall. The guiding rod is movably inserted into the guiding hole. A second spring is installed between the guiding rod and the piston rod and inside the guiding hole. A pressing frame is sleeved outside the contraction part. The pressing frame is located below the piston. A nut is threadedly connected to the outside of the contraction part.

[0006] As a preferred scheme of the utility model, the piston rod and the guiding rod are on the same axis.

[0007] As a preferred scheme of the utility model, a first spring is installed between the pressing frame and the inner tube. The first spring is located inside the inner tube.

[0008] As a preferred scheme of the utility model, a plurality of oil drainage holes are penetrated through the inner tube.

[0009] As a preferred scheme of the utility model, an oil return hole is arranged on the inner tube.

[0010] As a preferred embodiment of the present utility model, an oil seal is installed on the inner wall of the outer tube.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows: the guide rod provided in the present utility model can play a guiding role for the piston rod, greatly reducing the situation of unbalanced displacement of the piston rod, so as to ensure that the hydraulic buffer has a good buffering effect and extend its service life. And the second spring provided can play an auxiliary buffering role to achieve a double buffering effect, so as to improve the buffering effect of the hydraulic buffer. Description of the Drawings

[0012] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0013] Figure 2 is a sectional view of the present utility model;

[0014] Figure 3 is the present utility model Figure 2 an enlarged view of part A in.

[0015] In the figure: 1. Outer tube; 2. Piston rod; 3. End cover; 4. Base; 5. Oil seal; 6. Inner tube; 7. Guide rod; 8. Oil drain hole; 9. First spring; 10. Nut; 11. Oil return hole; 12. Second spring; 13. Guide hole; 14. Piston; 15. Shrinkage part; 16. Pressing frame. Detailed Embodiment

[0016] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0017] Please refer to Figures 1 to 3, the utility model provides a technical solution: a hydraulic buffer, which includes an outer tube 1 and an inner tube 6 fixedly installed inside the outer tube 1. The inner tube 6 is filled with hydraulic oil, and there is a gap between the outer tube 1 and the inner tube 6 to facilitate the flow of the hydraulic oil. One end of the outer tube 1 is provided with an end cap 3, and the other end of the outer tube 1 is provided with a base 4. A piston 14 is movably arranged inside the inner tube 6, and a piston rod 2 is installed on the piston 14. One end of the piston rod 2 passes through the end cap 3 and extends to the outside of the outer tube 1. A contraction part 15 is integrally formed at the bottom of the piston rod 2. A guiding hole 13 is provided between the piston rod 2 and the contraction part 15. A guiding rod 7 is fixedly connected to the bottom of the inner wall of the inner tube 6. The guiding rod 7 is used to guide the piston rod 2, greatly reducing the situation of displacement imbalance of the piston rod 2, so as to ensure that the hydraulic buffer has a good buffering effect and extend its service life. The guiding rod 7 is movably inserted into the guiding hole 13. A second spring 12 is installed between the guiding rod 7 and the piston rod 2 and inside the guiding hole 13. The second spring 12 can play an auxiliary buffering role to achieve a double buffering effect, so as to improve the buffering effect of the hydraulic buffer. A pressing frame 16 is sleeved outside the contraction part 15. The pressing frame 16 is located below the piston 14. A nut 10 is threadedly connected to the outside of the contraction part 15. The nut 10 presses the piston 14 through the pressing frame 16, thereby connecting and fixing the piston 14 and the piston rod 2.

[0018] Among them, the piston rod 2 and the guiding rod 7 are on the same axis.

[0019] Among them, a first spring 9 is installed between the pressing frame 16 and the inner tube 6. The first spring 9 is used to reset the piston 14 to the initial position, prepare for the next impact or buffering action, and at the same time can absorb part of the impact energy and convert it into elastic potential energy. The first spring 9 is located inside the inner tube 6.

[0020] Among them, a plurality of oil discharge holes 8 are provided through the inner tube 6. When the piston rod 2 is impacted by an external force, it will drive the piston 14 to squeeze the hydraulic oil in the inner tube 6. The hydraulic oil is discharged through the oil discharge holes 8 and flows to the upper part of the piston 14 through the gap between the outer tube 1 and the inner tube 6 and the oil return hole 11 in sequence, thus generating resistance.

[0021] Among them, an oil return hole 11 is provided on the inner tube 6. When the external force applied to the piston rod 2 disappears, the first spring 9 resets the piston 14, and the hydraulic oil returns to the lower part of the piston 14 through the oil return hole 11, the gap between the outer tube 1 and the inner tube 6, and the oil discharge holes 8 in sequence.

[0022] Among them, an oil seal 5 is installed on the inner wall of the outer tube 1. The oil seal 5 is used to form an effective sealing barrier to prevent the leakage of hydraulic oil, and the oil seal 5 can also effectively prevent external impurities from entering the inside of the outer tube 1.

[0023] Specifically, when the piston rod 2 is impacted by an external force, it will drive the piston 14 to move. The piston rod 2 will compress the second spring 12, and the second spring 12 absorbs part of the impact force. The piston 14 will not only compress the first spring 9, and the first spring 9 absorbs part of the impact energy and converts it into elastic potential energy, but also the piston 14 will squeeze the hydraulic oil in the inner tube 6. After being pressurized, the hydraulic oil is discharged through the oil discharge hole 8 and flows to the upper part of the piston 14 through the gap between the outer tube 1 and the inner tube 6 and the oil return hole 11 in sequence, thus generating resistance and playing a buffering role. When the external force acting on the piston rod 2 disappears, the first spring 9 causes the piston 14 and the piston rod 2 to reset, and the second spring 12 assists the piston rod 2 to reset. The hydraulic oil returns to the lower part of the piston 14 through the oil return hole 11, the gap between the outer tube 1 and the inner tube 6, and the oil discharge hole 8 in sequence, preparing for the next impact action.

[0024] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0025] In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", "fourth" may explicitly or implicitly include at least one of such features.

[0026] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "set", "connected", "fixed", "swivelly connected", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0027] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic buffer, comprising an outer tube (1) and an inner tube (6) fixedly installed inside the outer tube (1). One end of the outer tube (1) is provided with an end cover (3), and the other end of the outer tube (1) is provided with a base (4). A piston (14) is movably arranged inside the inner tube (6), and a piston rod (2) is installed on the piston (14). One end of the piston rod (2) passes through the end cover (3) and extends to the outside of the outer tube (1), characterized in that: A contraction part (15) is integrally formed at the bottom of the piston rod (2). A guiding hole (13) is provided between the piston rod (2) and the contraction part (15). A guiding rod (7) is fixedly connected to the bottom of the inner wall of the inner tube (6). The guiding rod (7) is movably inserted into the guiding hole (13). A second spring (12) is installed inside the guiding hole (13) between the guiding rod (7) and the piston rod (2). A pressing frame (16) is sleeved outside the contraction part (15). The pressing frame (16) is located below the piston (14). A nut (10) is threadedly connected to the outside of the contraction part (15).

2. The hydraulic buffer according to claim 1, characterized in that: The piston rod (2) and the guiding rod (7) are on the same axis.

3. A hydraulic buffer according to claim 1, characterized in that: A first spring (9) is installed between the pressing frame (16) and the inner tube (6). The first spring (9) is located inside the inner tube (6).

4. A hydraulic buffer according to claim 1, characterized in that: A plurality of oil drain holes (8) are provided through the inner tube (6).

5. The hydraulic buffer according to claim 3, wherein: An oil return hole (11) is provided on the inner tube (6).

6. A hydraulic buffer according to claim 1, characterized in that: An oil seal (5) is installed on the inner wall of the outer tube (1).

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