High-speed power oil cylinder

Abstract

The utility model discloses a high-speed power oil cylinder which comprises a cylinder barrel, a piston rod is arranged in the cylinder barrel, a cylinder bottom is arranged at the bottom of the cylinder barrel, a high-pressure oil hole communicated with the interior of the cylinder barrel is formed in the cylinder bottom, a buffer rod is arranged at the bottom of the piston rod, a buffer hole is formed in the cylinder bottom, and the buffer hole is communicated with the high-pressure oil hole. The buffering structure is arranged between the piston rod and the cylinder bottom, so that when the piston rod retracts at a high speed without load, buffering speed reduction can be carried out at the tail end, and the impact force between the piston rod and the cylinder bottom is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders, and more specifically relates to a high-speed power oil cylinder. Background Art

[0002] High-speed hydraulic cylinders are special cylinders designed to meet the requirements of high-speed, high-precision, and high-load working environments. In terms of performance, high-speed hydraulic cylinders have higher operating speeds and higher load capacities, and can adapt to more stringent working conditions.

[0003] The end of the piston rod of the current high-speed oil cylinder has an external thread, which is connected to the flange thread. During high-speed impact, the flange and the external threads of the piston rod are directly subjected to force, which can easily cause damage to the external threads on the piston rod; at the same time, when the piston rod retracts at high speed, the hydraulic oil is discharged quickly, and the piston rod collides with the bottom of the cylinder with great force, which can easily cause damage. Utility Model Content

[0004] In response to the deficiencies of the prior art, the present invention provides a buffer structure between the piston rod and the cylinder bottom, so that when the piston rod retracts at high speed without load, it can be buffered and decelerated at the end, thereby reducing the impact force between the piston rod and the cylinder bottom.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-speed power oil cylinder, comprising a cylinder barrel, a piston rod arranged in the cylinder barrel, a cylinder bottom arranged at the bottom of the cylinder barrel, a high-pressure oil hole connected to the cylinder barrel, a buffer rod arranged at the bottom of the piston rod, a buffer hole arranged at the cylinder bottom, the buffer hole connected to the high-pressure oil hole, and a buffer gap left between the buffer hole and the outer wall of the buffer rod.

[0006] Furthermore, the end of the buffer rod away from the piston rod is retracted toward the middle.

[0007] Furthermore, an internal threaded hole is provided at one end of the piston rod extending out of the cylinder, and the flange is against the end of the piston rod. A through hole is provided at the flange corresponding to the internal threaded hole, and the flange is fixed to the internal threaded hole by bolts passing through the through hole.

[0008] Furthermore, a sealing piston is provided between the piston rod and the cylinder.

[0009] Compared with the prior art, the beneficial effects of the present invention are: by providing a buffer rod and a buffer hole, when the piston rod is quickly retracted without load and approaches the bottom of the cylinder, the piston rod extends into the buffer hole, so that the oil flow cross-sectional area of ​​the buffer hole is greatly reduced, the flow rate is reduced, and the piston rod finally moves slowly, avoiding high-speed collision between the piston rod and the bottom of the cylinder; the connection method between the piston rod and the flange is such that when the piston rod extends through the flange to do work, the flange directly applies the force to the end face of the piston rod, rather than the thread, which is more durable when used at high speed and high frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a cross-sectional view of the high-speed power cylinder of the utility model;

[0011] Figure 2 This is a schematic diagram of the flange when it is installed;

[0012] Figure 3 This is a schematic diagram of the piston rod rapidly retracting;

[0013] Figure 4 This is a schematic diagram of the piston rod slowly retracting.

[0014] Figure numerals: 1. cylinder barrel; 2. piston rod; 21. internal threaded hole; 22. buffer rod; 3. cylinder bottom; 31. high-pressure oil hole; 32. buffer hole; 321. buffer gap; 4. flange; 5. bolt. DETAILED DESCRIPTION

[0015] Reference Figures 1 to 4 The embodiment of the high-speed power cylinder of the utility model is further described.

[0016] In the description of the present invention, it should be noted that, for directional words, such as the terms "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific protection scope of the present invention.

[0017] 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. Therefore, the terms "first" and "second" may explicitly or implicitly refer to one or more of these features. In the description of this utility model, "several" and "a number" mean two or more, unless otherwise specifically defined.

[0018] A high-speed power cylinder includes a cylinder barrel 1, a piston rod 2 is provided in the cylinder barrel 1, a cylinder bottom 3 is provided at the bottom of the cylinder barrel 1, and the cylinder bottom 3 is provided with a high-pressure oil hole 31 connected to the cylinder barrel 1. A buffer rod 22 is provided at the bottom of the piston rod 2, and a buffer hole 32 is provided on the cylinder bottom 3. The buffer hole 32 is connected to the high-pressure oil hole 31, and a buffer gap 321 is left between the buffer hole 32 and the outer wall of the buffer rod 22.

[0019] A double-layer oil seal structure is used between the cylinder 1 and the piston rod 2 to greatly improve stability and reliability.

[0020] The buffer hole 32 in this embodiment is actually a part of the high-pressure oil hole 31 , and the oil passes through the buffer hole 32 when entering and exiting the cylinder 1 .

[0021] like Figure 3 As shown, when the piston rod 2 retracts at high speed, the oil in chamber A will quickly flow out through the high-pressure oil hole 31, and the piston rod 2 moves quickly; Figure 4 As shown, when the buffer rod 22 reaches the buffer hole 32, the buffer rod 22 will block most of the cross-section of the buffer hole 32, so that the oil in the A chamber can only flow out through the buffer gap 321, greatly reducing the flow rate. The buffer rod 22 will slowly retract, and the movement speed can be reduced in the final stage of the piston rod 2 to avoid high-speed collision with the cylinder bottom 3.

[0022] like Figure 3 As shown, in this embodiment, the buffer rod 22 preferably retracts toward the middle at one end away from the piston rod 2 .

[0023] The end of the buffer rod 22 that is retracted toward the middle can facilitate its smooth entry into the buffer hole 32 to achieve guided movement of the buffer rod 22 .

[0024] In this embodiment, the end of the piston rod 2 extending out of the cylinder 1 is preferably provided with an internal threaded hole 21, and the flange 4 is against the end of the piston rod 2. A through hole is opened in the flange 4 corresponding to the internal threaded hole 21, and the flange 4 is fixed to the internal threaded hole 21 by a bolt 5 passing through the through hole.

[0025] like Figure 1 and 2 As shown, when the piston rod 2 extends to the left to perform work, the force of the flange 4 is transmitted to the right directly through the end face of the piston rod 2, and the cooperation between the bolt 5 and the internal threaded hole 21 is only used to fix the flange 4, and does not bear the force of the flange 4 when performing work, thereby avoiding damage to the internal threaded hole 21.

[0026] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, certain improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A high-speed power cylinder, comprising a cylinder barrel, a piston rod disposed in the cylinder barrel, a cylinder bottom disposed at the bottom of the cylinder barrel, and a high-pressure oil hole connected to the cylinder barrel at the cylinder bottom, characterized in that: A buffer rod is provided at the bottom of the piston rod, a buffer hole is provided at the bottom of the cylinder, the buffer hole is connected to the high-pressure oil hole, and a buffer gap is left between the buffer hole and the outer wall of the buffer rod.

2. The high-speed power cylinder according to claim 1, characterized in that: The end of the buffer rod away from the piston rod is retracted toward the middle.

3. The high-speed power cylinder according to claim 2, characterized in that: An internal threaded hole is provided at one end of the piston rod extending out of the cylinder, and a flange is pressed against the end of the piston rod. A through hole is provided at the flange corresponding to the internal threaded hole, and the flange is fixed to the internal threaded hole by bolts passing through the through hole.

4. The high-speed power cylinder according to claim 3, characterized in that: A sealing piston is provided between the piston rod and the cylinder.

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