Double-cylinder combined type damping hydraulic cylinder

Abstract

The utility model discloses a double-cylinder combined type damping hydraulic cylinder which comprises a first cylinder barrel and a piston rod, the piston rod is connected to the inner side of the first cylinder barrel in a sliding mode to divide an inner cavity of the first cylinder barrel into a rodless cavity and a rod cavity, and the rodless cavity and the rod cavity are communicated through a throttling valve. The hydraulic cylinder further comprises a second cylinder barrel and a piston, the piston is connected to the inner side of the second cylinder barrel in a sliding mode to divide an inner cavity of the second cylinder barrel into two cavities, one cavity is communicated with the rodless cavity of the first cylinder barrel, and an elastic element is arranged in the other cavity. The two ends of the elastic element are fixed to the second cylinder barrel and the piston respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a double-cylinder combined damping hydraulic cylinder. Background Art

[0002] A damping hydraulic cylinder is a common damping element. When the hydraulic cylinder is subjected to external impact or vibration, the hydraulic oil inside it flows through specific damping holes, thereby generating a damping force. This damping force helps to absorb and consume vibration energy, enabling the hydraulic cylinder and its connected system to operate smoothly. However, the existing damping hydraulic cylinders not only have a complex structure and require a separate oil storage cylinder, but also cannot achieve two-way damping. Summary of the Utility Model

[0003] To solve the above problems in the prior art, the utility model provides a double-cylinder combined damping hydraulic cylinder, which includes a first cylinder barrel and a piston rod. The piston rod is slidably connected inside the first cylinder barrel to divide the inner cavity of the first cylinder barrel into a rodless cavity and a rod cavity, and the rodless cavity and the rod cavity are communicated through a throttle valve. The hydraulic cylinder further includes a second cylinder barrel and a piston. The piston is slidably connected inside the second cylinder barrel to divide the inner cavity of the second cylinder barrel into two chambers. One of the chambers is communicated with the rodless cavity of the first cylinder barrel, and an elastic element is arranged in the other chamber. Both ends of the elastic element are respectively fixed on the second cylinder barrel and the piston.

[0004] Further, an oil port Ⅰ is arranged on the side wall of the end of the rod cavity of the first cylinder barrel, and an oil port Ⅱ is arranged on the side wall of the end of the rodless cavity. The oil port Ⅰ is communicated with one end of the throttle valve through a pipeline, and the other end of the throttle valve is communicated with the oil port Ⅱ through a pipeline.

[0005] Further, an oil port Ⅲ is arranged on the side wall of the end of the rodless cavity, and an oil port Ⅳ is arranged at one end of the second cylinder barrel far from the elastic element. The oil port Ⅲ and the oil port Ⅳ are communicated through a pipeline.

[0006] Further, the second cylinder barrel is fixed on the outer side wall of the first cylinder barrel through a bracket.

[0007] Further, the throttle valve is a two-way throttle valve.

[0008] Further, the first cylinder barrel has an open structure at one end, one end of the piston rod extends to the outside of the first cylinder barrel, and the opening of the first cylinder barrel is hermetically and slidably connected with the piston rod through a guide sleeve.

[0009] Further, an earring is connected to one end of the piston rod located outside the first cylinder barrel.

[0010] Compared with the prior art, the double-cylinder combined damping hydraulic cylinder of the present utility model mainly has the following advantages:

[0011] The double-cylinder combined damping hydraulic cylinder of this embodiment realizes a buffering effect when the piston rod is subjected to thrust or tension through the second cylinder barrel and the throttle valve. It can cope with the instability or damage that may occur due to sudden speed changes, realizes two-way damping during the working process of the hydraulic cylinder, and improves the stability of the hydraulic cylinder. At the same time, by adding an elastic element to make up for the pressure difference imbalance caused by the different oil storage areas of the rodless cavity and the rod cavity during the telescopic process of the piston rod, automatic oil replenishment is realized. Description of the Drawings

[0012] Figure 1 is a schematic structural diagram of the double-cylinder combined damping hydraulic cylinder of the present utility model;

[0013] Figure 2 is a hydraulic schematic diagram of the double-cylinder combined damping hydraulic cylinder of the present utility model;

[0014] In the figure: 1. Throttle valve; 2. Piston rod; 3. First cylinder barrel; 31. Rodless cavity; 32. Rod cavity; 4. Oil pipe; 5. Guide sleeve; 6. Earring; 7. Piston; 8. Spring; 9. Second cylinder barrel. Detailed Embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model but are not used to limit the scope of the present utility model.

[0016] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation of the present utility model.

[0017] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] Such asFigure 1-2 As shown in the figure, the utility model discloses a double-cylinder combined damping hydraulic cylinder, which includes a first cylinder barrel 3 and a piston rod 2. The piston rod 2 is slidably connected to the inner side of the first cylinder barrel 3, dividing the inner cavity of the first cylinder barrel 3 into a rodless cavity 31 and a rod cavity 32. The rodless cavity 31 and the rod cavity 32 are connected through a throttle valve 1, and among them, the throttle valve 1 is a two-way throttle valve. The hydraulic cylinder further includes a second cylinder barrel 9 and a piston 7. The piston 7 is slidably connected to the inner side of the second cylinder barrel 9, dividing the inner cavity of the second cylinder barrel 9 into two chambers. One of the chambers is connected to the rodless cavity 31 of the first cylinder barrel 3, and an elastic element 8 is arranged in the other chamber. Both ends of the elastic element 8 are respectively fixed on the second cylinder barrel 9 and the piston 7. Preferably, the elastic element 8 is a spring.

[0019] In some embodiments, an oil port I is arranged on the end side wall of the rod cavity 32 of the first cylinder barrel 3, and an oil port II is arranged on the end side wall of the rodless cavity 31. The oil port I is connected to one end of the throttle valve 1 through a pipeline 4, and the other end of the throttle valve 1 is connected to the oil port II through the pipeline 4.

[0020] In some embodiments, an oil port III is arranged on the end side wall of the rodless cavity 31, and an oil port IV is arranged at one end of the second cylinder barrel 9 away from the elastic element 8. The oil port III of the rodless cavity 31 and the oil port IV of the second cylinder barrel 9 are connected through a pipeline 4.

[0021] In the above embodiments, the specific position of the second cylinder barrel 9 can be selected according to actual needs. For example, the second cylinder barrel 9 can be fixed on the outer side wall of the first cylinder barrel 3 through a bracket.

[0022] In some embodiments, the first cylinder barrel 3 has an open-end structure. One end of the piston rod 2 extends to the outside of the first cylinder barrel 3. The opening of the first cylinder barrel 3 is hermetically and slidably connected to the piston rod 2 through a guide sleeve 5. An earring 6 is connected to one end of the piston rod 2 located outside the first cylinder barrel 3.

[0023] Working principle and implementation solution:

[0024] When an external force acts on the earring 6 with a tensile force, the piston rod 2 of the first cylinder barrel 3 extends outward under the action of the tensile force. The volume of the rod cavity 32 of the first cylinder barrel 3 decreases, and the hydraulic oil enters the rodless cavity 31 of the first cylinder barrel 3 through the oil port I of the rod cavity 32, the pipeline 4 and the throttle valve 1. At this time, by adjusting the size of the oil port of the throttle valve 1, the speed of the hydraulic oil passing through can be controlled, and then the volume of the oil in the rod cavity 32 can be adjusted to counteract the external force and play a buffering role.

[0025] When an external force exerts a thrust on the earring 6, the piston rod 2 of the first cylinder barrel 3 retracts inward under the action of the thrust. The volume of the rodless cavity 31 of the first cylinder barrel 3 decreases, and the volume of the rod chamber 32 increases. Since the cross-sectional area of the rodless cavity 31 is larger than that of the rod chamber 32, the volume reduced by the rodless cavity 31 is larger than the volume increased by the rod chamber 32. The volume difference between the rodless cavity 31 and the rod chamber 32 causes excess hydraulic oil. At this time, the excess hydraulic oil enters the second cylinder barrel 9 through the oil port III of the rodless cavity 31 via the oil pipe 4 and the oil port IV of the second cylinder barrel 9.

[0026] After the hydraulic oil enters the second cylinder barrel 9, it exerts a force on the piston 7. The piston 7 moves to compress the elastic element 8, and the elastic element 8 exerts a reaction force against the external force, thus playing a buffering role.

[0027] The above is the entire action cycle. When the external force exerts a pulling force on the earring 6 next time, the volume increased by the rodless cavity 31 of the first cylinder barrel 3 is larger than the volume decreased by the rod chamber 32. At this time, the hydraulic oil in the second cylinder barrel 9 is automatically replenished to the rodless cavity 31 of the first cylinder barrel 3 under the action of the elastic element 8.

[0028] The double-cylinder combined damping hydraulic cylinder of this embodiment realizes buffering when the piston rod 2 is subjected to thrust or pulling force through the second cylinder barrel 9 and the throttle valve 1. It can cope with the instability or damage that may occur due to sudden changes in speed, realizes bidirectional damping during the working process of the hydraulic cylinder, and improves the stability of the hydraulic cylinder. At the same time, by adding the elastic element 8 to make up for the pressure difference imbalance caused by the different oil storage areas of the rodless cavity 31 and the rod chamber 32 during the telescopic process of the piston rod 2, automatic oil replenishment is realized.

[0029] It can be understood that what is described in the specific implementation manner is only one embodiment of the present invention. Those skilled in the art can make various changes or equivalent replacements to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teaching of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present invention.

Claims

1. A double-cylinder combined damping hydraulic cylinder, comprising a first cylinder barrel (3) and a piston rod (2), wherein the piston rod (2) is slidably connected to the inner side of the first cylinder barrel (3) to divide the inner cavity of the first cylinder barrel (3) into a rodless cavity (31) and a rod cavity (32), characterized in that: The rodless chamber (31) and the rod chamber (32) are connected via a throttle valve (1); the hydraulic cylinder further comprises a second cylinder barrel (9) and a piston (7), wherein the piston (7) is slidably connected to the inner side of the second cylinder barrel (9) to divide the inner chamber of the second cylinder barrel (9) into two chambers, wherein one chamber is connected to the rodless chamber (31) of the first cylinder barrel (3), and an elastic element (8) is provided in the other chamber, wherein two ends of the elastic element (8) are respectively fixed to the second cylinder barrel (9) and the piston (7).

2. The double-cylinder combined damping hydraulic cylinder according to claim 1, characterized in that: An oil port I is provided on the end side wall of the rod chamber (32) of the first cylinder barrel (3), and an oil port II is provided on the end side wall of the rodless chamber (31). The oil port I is connected to one end of the throttle valve (1) through an oil pipe (4), and the other end of the throttle valve (1) is connected to the oil port II through an oil pipe (4).

3. The double-cylinder combined damping hydraulic cylinder according to claim 1, characterized in that: An oil port III is provided on the end side wall of the rodless cavity (31), and an oil port IV is provided on the end of the second cylinder (9) away from the elastic element (8), and the oil port III and the oil port IV are connected through an oil pipe (4).

4. The double-cylinder combined damping hydraulic cylinder according to claim 1, characterized in that: The second cylinder (9) is fixed to the outer side wall of the first cylinder (3) via a bracket.

5. The double-cylinder combined damping hydraulic cylinder according to claim 1, characterized in that: The throttle valve (1) is a two-way throttle valve.

6. The double-cylinder combined damping hydraulic cylinder according to claim 1, characterized in that: The first cylinder (3) is a structure with one end open, one end of the piston rod (2) extends to the outside of the first cylinder (3), and the opening of the first cylinder (3) is sealingly slidably connected to the piston rod (2) via a guide sleeve (5).

7. The double-cylinder combined damping hydraulic cylinder according to claim 6, characterized in that: An earring (6) is connected to one end of the piston rod (2) located outside the first cylinder (3).

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