A hydraulic cylinder effective to suppress in-cylinder swirl

Abstract

The utility model relates to a kind of effectively inhibiting hydraulic cylinder in eddy current, including piston, back cover, oil passing rod, displacement sensor, front cover, front flange cover, cylinder barrel, connecting rod and movable magnetic ring. Front cover and back cover are located at the both sides of cylinder barrel, and front flange cover is fixedly connected with front cover by bolt. Oil passing rod is installed in the back cover of hydraulic cylinder, and the axial direction of oil passing rod is same with connecting rod. One end of oil passing rod is provided with disc-shaped feature, and multiple through holes are evenly arranged on disc-shaped feature. Multiple through holes on the disc-shaped feature of back cover and oil passing rod jointly form multiple oil passages. The utility model realizes uniform pressure and smooth pushing to piston, eliminates eddy current generation and the phenomenon of piston rotation caused thereby, and the oil flow after oil passing rod is regular avoids directly impacting displacement sensor inside hydraulic cylinder, significantly reduces the risk of sensor bending deformation and component damage, thereby realizing reliable protection to displacement sensor.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission equipment, and in particular to a hydraulic cylinder that effectively suppresses eddy currents inside the cylinder. Background Technology

[0002] Hydraulic cylinders with the oil inlet perpendicular to the piston rod's direction of movement commonly exhibit a phenomenon where the piston rod rotates during its reciprocating motion. This problem is not accidental; the core reason lies in the fact that when hydraulic oil under high speed and high pressure is injected into the hydraulic cylinder through the inlet, because the oil inlet direction is perpendicular to the piston rod's direction of movement, the oil cannot flow smoothly along the piston rod's trajectory. Instead, it directly impacts the inner wall of the hydraulic cylinder, forming irregular and powerful eddies within the cylinder. These eddies exert non-uniform lateral forces on the piston, causing it to inevitably rotate around the axis while moving linearly along it. This rotation not only affects the hydraulic cylinder's motion accuracy but may also exacerbate wear between the piston rod and seals / guide sleeves, reducing the service life of these components.

[0003] On the other hand, the oil inlet is perpendicular to the piston rod's direction of movement, which severely affects the displacement sensor inside the hydraulic cylinder. Displacement sensors typically need to be installed along the hydraulic cylinder axis to accurately monitor the piston rod's stroke. However, under the continuous impact of high-pressure, high-speed hydraulic oil in a vertical direction, the sensor's mounting base is prone to loosening, and the rod itself may bend and deform due to repeated asymmetrical impact forces. In severe cases, this can even damage internal sensor components, ultimately causing data distortion, signal interruption, and other malfunctions, directly affecting the closed-loop control effect and overall operational stability of the equipment.

[0004] To address the problems of eddy currents causing piston rotation and damage to displacement sensors in hydraulic cylinders where the oil inlet direction is perpendicular to the piston rod, this invention designs a hydraulic cylinder that effectively suppresses eddy currents within the cylinder. The irregular, powerful eddy currents that would otherwise easily impact the cylinder wall are uniformly decomposed into several stable oil flows parallel to the piston's direction of motion by the guiding and diverting action of the oil rod. These oil flows act synchronously on the piston end face along the hydraulic cylinder axis, achieving uniform pressure and smooth pushing of the piston, ensuring that the piston only performs pure linear motion and completely eliminating the generation of eddy currents and the resulting piston rotation. Simultaneously, the oil flow regulated by the oil rod avoids direct impact on the displacement sensor inside the hydraulic cylinder, effectively isolating the asymmetrical force of the high-pressure oil flow on the sensor rod and mounting base, significantly reducing the risk of sensor bending deformation and component damage, thus achieving reliable protection for the displacement sensor and ensuring its long-term stable and accurate monitoring of the piston rod stroke.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present invention, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] This utility model aims to solve the core technical pain points of existing hydraulic cylinders where the oil inlet direction is perpendicular to the piston rod movement direction. Specifically, high-pressure, high-speed hydraulic oil entering the hydraulic cylinder easily impacts the cylinder wall, forming irregular and powerful eddies. This causes the piston to rotate during reciprocating motion, affecting the movement accuracy of the hydraulic cylinder and aggravating component wear. At the same time, the asymmetric oil flow impact caused by the eddies can cause the displacement sensor built into the hydraulic cylinder to bend and deform, and damage the component, leading to sensor failure and affecting the closed-loop control effect and operational stability of the equipment.

[0007] This utility model solution:

[0008] An oil guide rod is installed at the oil inlet of the hydraulic cylinder. The outlet end of the oil guide rod is provided with a ring of equally spaced oil outlet holes along the circumference. The oil outlet holes are smooth internal guide channels, forming a complete fluid path of "oil inlet-guide-diversion" to ensure smooth oil flow without turbulence.

[0009] Specifically, this utility model includes a front cover, a rear cover, a front flange cover, a piston, a connecting rod, an oil passage rod, a displacement sensor, and a cylinder. The front flange cover is located at the front end of the hydraulic cylinder and is fixedly connected to the front cover by bolts; the front cover, cylinder, and rear cover are fixedly connected. The oil passage rod is installed inside the rear cover of the cylinder; one end of the oil passage rod has a disc-shaped feature with multiple through holes evenly distributed on it; the rear cover and the oil passage rod together form multiple oil channels.

[0010] When high-pressure, high-speed hydraulic oil is injected through the hydraulic cylinder inlet, it first enters the internal guide channel of the oil rod. The oil flow, which originally flowed perpendicular to the piston's direction of movement, is constrained and guided by the oil rod, preventing direct impact on the inner wall of the hydraulic cylinder. Subsequently, the oil flow is evenly distributed through the equally spaced oil outlet holes at the outlet end, decomposing into several stable oil flows parallel to the piston's direction of movement. These oil flows act synchronously on the piston end face along the hydraulic cylinder axis, forming a uniform and symmetrical thrust, driving the piston to perform only a pure linear reciprocating motion, completely eliminating the conditions for eddy current generation. At the same time, the regulated and stable oil flow no longer directly impacts the displacement sensor inside the hydraulic cylinder, isolating the asymmetrical force from the sensor rod and mounting base, thus achieving effective protection for the displacement sensor.

[0011] The present invention achieves the following significant beneficial effects through the above technical solution:

[0012] 1) Completely eliminate eddies and piston rotation: The flow diversion and guiding effect of the oil rod makes the oil flow in a stable state parallel to the piston movement direction, completely avoiding the formation of irregular eddies. The piston only performs precise linear movement without any rotation, which improves the movement accuracy of the hydraulic cylinder and reduces the wear of the piston rod, seals and guide sleeves.

[0013] 2) Reliable protection for displacement sensors: The regulated oil flow avoids direct impact on the displacement sensors, reducing the risk of sensor bending deformation and component damage, ensuring long-term stable operation of the sensors, ensuring the accuracy of piston rod stroke monitoring data, and providing reliable support for closed-loop control of the equipment.

[0014] 3) Simple structure and strong adaptability: The oil rod structure is simple and does not require major modifications to the main structure of the hydraulic cylinder. It can be directly adapted to the oil inlet of existing hydraulic cylinders of the same type, making installation convenient, cost controllable, and easy to promote and apply in batches.

[0015] 4) Improve the overall performance of the hydraulic cylinder: The stability and uniformity of the oil flow not only optimize the piston movement state, but also reduce the energy consumption and noise during the operation of the hydraulic cylinder, extend the service life of the hydraulic cylinder and its internal components, and improve the overall operational stability and economy of the equipment.

[0016] In addition to the objectives, features, and advantages described above, this utility model has other objectives, features, and advantages. The present utility model will now be described in further detail with reference to the figures. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model;

[0019] Figure 2 This is a schematic diagram of the oil passage rod structure of the device of this utility model;

[0020] Figure 3 for Figure 2 Top view;

[0021] Reference numerals for each figure:

[0022] 1. Piston; 2. Rear cover; 3. Oil guide rod; 4. Displacement sensor; 5. Front cover; 6. Front flange cover; 7. Cylinder; 8. Connecting rod; 9. Movable magnetic ring. Detailed Implementation

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] A hydraulic cylinder that effectively suppresses in-cylinder eddy currents includes a piston 1, a rear cover 2, an oil passage rod 3, a displacement sensor 4, a front cover 5, a front flange cover 6, a cylinder barrel 7, a connecting rod 8, and a movable magnetic ring 9.

[0027] The front cover 5 and the rear cover 2 are located on both sides of the cylinder 7;

[0028] The front flange cover 6 is located at the front end of the hydraulic cylinder, and it is fixedly connected to the front cover 5 by bolts;

[0029] The front cover 5, rear cover 2, cylinder 7, and front flange cover 6 are fixedly connected.

[0030] The oil passage rod 3 is installed inside the rear cover 2 of the hydraulic cylinder, and the axial direction of the oil passage rod 3 is the same as that of the connecting rod 8.

[0031] like Figure 2 and Figure 3As shown, one end of the oil-passing rod 3 is provided with a disc-shaped feature, and multiple through holes are evenly arranged on the disc-shaped feature; multiple threaded holes are provided on the end face of the other end of the oil-passing rod 3, and the oil-passing rod 3 is fixedly connected to the rear cover 2 by bolts.

[0032] Both the rear cover 2 and the front cover 5 have hydraulic cylinder inlet / outlet ports on their sides;

[0033] The oil inlet / outlet ports are connected to the hollow portion of the cylinder 7, and the direction of these oil inlet / outlet ports is perpendicular to the connecting rod 8;

[0034] Multiple through holes on the disc-shaped features of the rear cover 2 and the oil passage rod 3 together form multiple oil channels.

[0035] The piston 1 is located inside the cylinder 7, and the piston 1 is coaxially and fixedly connected to one end of the connecting rod 8; the other end of the connecting rod 8 extends out from the central through hole of the front flange cover 6 and the front cover 5.

[0036] The connecting rod 8 has a long blind hole at one end facing the inside of the cylinder 7;

[0037] The displacement sensor 4 is fixed on the outside of the rear cover 2, and the detection rod of the displacement sensor 4 is inserted into the long blind hole of the connecting rod 8.

[0038] Preferably, the displacement sensor 4 is a built-in magnetostrictive displacement sensor with a movable magnetic ring 9.

[0039] The displacement sensor 4 determines the displacement value of the object being measured by detecting the absolute position of the movable magnetic ring 9. In this embodiment, the movable magnetic ring 9 is fixedly installed at the end of the connecting rod 8 inside the cylinder 7.

[0040] When piston 1 moves inside cylinder 7, displacement sensor 4 remains stationary, and movable magnetic ring 9 moves with piston 1.

[0041] When high-pressure, high-speed hydraulic oil is injected through the inlet / outlet of the hydraulic cylinder, it first enters the internal guide channel of the oil rod 3. The oil flow, which originally flowed perpendicular to the direction of piston 1, is constrained and guided by the oil rod 3, thus avoiding direct impact on the inner wall of the cylinder 7. Subsequently, the oil flow is evenly distributed through the equally spaced oil outlet holes at the outlet end, decomposing into several stable oil flows parallel to the direction of piston movement. These oil flows act synchronously on the end face of piston 1 along the axis of the hydraulic cylinder, forming a uniform and symmetrical thrust, driving the piston to perform only a pure linear reciprocating motion, completely eliminating the conditions for eddy current generation. At the same time, the regularized stable oil flow no longer directly impacts the displacement sensor inside the hydraulic cylinder, isolating the influence of asymmetrical forces on the sensor rod and mounting base, thus achieving effective protection for the displacement sensor.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or 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. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hydraulic cylinder that effectively suppresses eddy currents within the cylinder, characterized in that: Includes piston (1), rear cover (2), oil passage rod (3), displacement sensor (4), front cover (5), front flange cover (6), cylinder (7), and connecting rod (8); The front flange cover (6) is located at the front end of the hydraulic cylinder and is fixedly connected to the front cover (5) by bolts; The front cover (5), rear cover (2), cylinder (7) and front flange cover (6) are fixedly connected; Multiple threaded holes are provided on the end face of the other end of the oil passage rod (3), and the oil passage rod (3) is fixedly connected to the rear cover (2) by bolts; The sides of the rear cover (2) and the front cover (5) are provided with oil inlet / outlet ports for hydraulic cylinders; the oil inlet / outlet ports are connected to the hollow part of the cylinder barrel (7) and are perpendicular to the connecting rod (8); The piston (1) is located inside the cylinder (7), and the piston (1) is coaxially fixedly connected to one end of the connecting rod (8); the other end of the connecting rod (8) extends out from the central through hole of the front flange cover (6) and the front cover (5); The connecting rod (8) has a long blind hole at one end facing the inside of the cylinder (7); The displacement sensor (4) is fixed on the outside of the back cover (2).

2. A hydraulic cylinder for effectively suppressing in-cylinder eddy currents according to claim 1, characterized in that: The oil passage rod (3) is installed inside the rear cover (2) of the hydraulic cylinder. The axial direction of the oil passage rod (3) is the same as that of the connecting rod (8). One end of the oil passage rod (3) is provided with a disc-shaped feature, and multiple through holes are evenly arranged on the disc-shaped feature. Multiple through holes on the disc-shaped features of the rear cover (2) and the oil rod (3) together form multiple oil channels.

3. A hydraulic cylinder for effectively suppressing in-cylinder eddy currents according to claim 1, characterized in that: The displacement sensor (4) is a built-in magnetostrictive displacement sensor with a movable magnetic ring (9). The movable magnetic ring (9) is fixedly installed at the end of the connecting rod (8) on one side inside the cylinder (7).

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