A cylinder

Abstract

The utility model relates to the technical field of hydraulic transmission, concretely relates to an oil cylinder. An oil cylinder, comprising: a cylinder body; a piston piece, the piston piece is slidably assembled in the cylinder body, the piston piece divides the cylinder body into a pressurizing cavity and a rod cavity, the pressurizing cavity and the rod cavity are communicated; an internal piston, the internal piston is fixedly assembled in the cylinder body, the internal piston extends into the piston piece, and the internal piston divides the piston piece into a lifting cavity and a pressure relief cavity. The technical problem that the diameter of the oil cylinder in the prior art is limited to cause the limited thrust is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic transmission technology, specifically to a hydraulic cylinder. Background Technology

[0002] Hydraulic transmission technology plays a crucial role in many industrial sectors, transmitting power through the pressure of liquids to achieve precise control and efficient operation of various mechanical equipment. In heavy machinery, especially large presses, the hydraulic cylinder, as a core component, has a vital impact on the overall performance, efficiency, and stability of the equipment.

[0003] In existing technologies, conventional large-scale press cylinders have several limitations. On one hand, to meet the demand for high thrust, the cylinder diameter is designed to be large. However, as the cylinder diameter increases, the oil pressure it can withstand becomes limited. This is because excessively high oil pressure causes increased deformation of the cylinder barrel. The sealing structure of conventional cylinders is located at the piston and cylinder barrel; once the cylinder barrel undergoes significant deformation, the seal at this point is prone to failure. After seal failure, the cylinder will not function properly, thus limiting its output force. Therefore, in the design of traditional heavy-duty cylinders, there is a mutually restrictive relationship between cylinder diameter and oil pressure, which significantly hinders further performance improvements and makes it difficult to fully meet the needs of applications with extremely high thrust requirements.

[0004] On the other hand, most traditional press cylinders are single-acting cylinders, i.e., piston cylinders, which only provide thrust and not pull. In actual use, to achieve a complete cycle, an additional lifting cylinder is needed to assist in the retraction of the main piston rod. This not only increases the overall installation space of the equipment but also makes the system structure more complex, increasing manufacturing costs and maintenance difficulty.

[0005] Furthermore, there is room for improvement in the weight of conventional hydraulic cylinders. As industrial equipment develops towards higher efficiency and energy conservation, the demand for lightweight hydraulic cylinder design is becoming increasingly prominent. However, the material and structural design of existing hydraulic cylinders and other components have not fully considered the requirements for lightweighting, resulting in a large overall weight. This hinders the flexible installation and operation of equipment and also affects the efficient use of energy to some extent. Utility Model Content

[0006] In order to solve the technical problem that the limited thrust caused by the limited diameter of the hydraulic cylinder in the prior art, this utility model provides a hydraulic cylinder that solves the above-mentioned technical problem.

[0007] To solve the above-mentioned technical problems, this utility model provides a hydraulic cylinder, comprising:

[0008] Cylinder block;

[0009] A piston assembly is slidably mounted in the cylinder body, and the piston assembly divides the cylinder body into a pressurizing chamber and a rod chamber, the pressurizing chamber and the rod chamber being in communication;

[0010] An internal piston is fixedly assembled inside the cylinder body. The internal piston extends into the piston assembly, dividing the interior of the piston assembly into a lifting chamber and a pressure relief chamber.

[0011] According to one embodiment of the present invention, the piston component includes a first piston rod and a first piston, and an inner cavity is formed between the first piston rod and the first piston.

[0012] According to one embodiment of the present invention, an oil guide port is formed on the first piston, and the pressurization chamber and the rod chamber are connected through the oil guide port.

[0013] According to one embodiment of the present invention, a gap is formed between the first piston and the inner wall of the cylinder, and the pressurization chamber and the rod chamber are connected through the gap.

[0014] According to one embodiment of the present invention, the built-in piston includes a second piston rod and a second piston. One end of the second piston rod is fixed to the cylinder body, and the other end of the second piston rod is provided with the second piston, which is located inside the inner cavity.

[0015] According to one embodiment of the present invention, a sealing structure is provided between the second piston rod and the first piston, between the second piston and the first piston rod, and between the first piston rod and the cylinder body.

[0016] According to one embodiment of the present invention, a guide structure is provided between the second piston rod and the first piston, and between the first piston rod and the cylinder body.

[0017] According to one embodiment of the present invention, a pressurized oil port is formed on the cylinder body, the pressurized oil port is connected to the pressurized chamber, a lifting oil port is provided on the built-in piston, the lifting oil port is connected to the lifting chamber, and an oil drain port is provided on the built-in piston or the piston member, the oil drain port is connected to the pressure relief chamber.

[0018] According to one embodiment of the present invention, the cylinder body includes a cylinder barrel, and end caps are respectively sealed at both ends of the cylinder barrel. The built-in piston is fixedly assembled on one end cap, and the piston slides through the other end cap.

[0019] According to one embodiment of the present invention, the cylinder barrel includes a cylinder barrel liner and an outer layer of fibers, wherein the outer layer of fibers is attached to the outer surface of the cylinder barrel liner.

[0020] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:

[0021] 1. The hydraulic cylinder of this utility model, by setting an internal piston located inside the cylinder body and extending into the piston component, divides the cylinder body into a pressurizing chamber and a rod chamber, and the piston component into a lifting chamber and a pressure relief chamber. By introducing oil into the pressurizing chamber, the piston component can be driven to extend; by introducing oil into the lifting chamber, the piston component can be driven to retract. That is, the setting of the internal piston gives the hydraulic cylinder a return stroke capability. Compared with a single-acting cylinder, the hydraulic cylinder of this utility model can provide both thrust and pull force without the need for an additional lifting cylinder. The pressurizing chamber and the rod chamber are connected, and there is no need to consider sealing issues between the piston component and the cylinder body. Without the need for a sealing structure, the hydraulic cylinder can be made into a large-diameter hydraulic cylinder, which can withstand greater oil pressure and output greater thrust.

[0022] 2. In the hydraulic cylinder of this utility model, by forming an oil guide port on the first piston or creating a gap between the first piston and the inner wall of the cylinder, the pressurization chamber and the rod chamber are kept in communication, thus eliminating the need for a seal between the piston and the cylinder. Sealing and guiding structures are provided between the second piston rod and the first piston, between the second piston and the first piston rod, and between the first piston rod and the cylinder. Therefore, the diameter of the hydraulic cylinder can be made very large, and even with significant cylinder deformation, sealing and guiding functions can still be guaranteed.

[0023] 3. The cylinder of this utility model has a cylinder barrel composed of an inner cylinder liner and an outer fiber layer, which can improve the cylinder's resistance to deformation and reduce the cylinder's weight. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the hydraulic cylinder of this utility model;

[0025] Figure 2 This is a schematic diagram showing the state of the hydraulic cylinder in its retracted state.

[0026] Figure 3 This is a schematic diagram of the hydraulic cylinder in the extended state.

[0027] In the diagram: 1-Cylinder block; 11-Cylinder barrel; 111-Cylinder barrel liner; 112-Outer fiber layer; 12-First end cap; 121-Pressure port; 13-Second end cap; 1A-Pressure chamber; 1B-Rod chamber; 2-Piston assembly; 21-First piston rod; 211-Drain port; 22-First piston; 221-Guide port; 2A-Lifting chamber; 2B-Pressure relief chamber; 3-Internal piston; 31-Second piston rod; 311-Lifting port; 32-Second piston. Detailed Implementation

[0028] The technical solutions of the present utility model 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 utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0034] Example 1

[0035] like Figure 1-3 As shown, this embodiment provides a hydraulic cylinder, including a cylinder body 1, a piston 2, and a built-in piston 3. The piston 2 is slidably assembled inside the cylinder body 1, dividing the cylinder body 1 into a pressurizing chamber 1A and a rod chamber 1B. The built-in piston 3 is fixedly assembled inside the cylinder body 1, extending into the piston 2 and dividing the piston 2 into a lifting chamber 2A and a pressure relief chamber 2B. When the hydraulic cylinder needs to extend, oil enters the pressurizing chamber 1A of the cylinder body 1, which pushes the piston 2 to slide out; when the hydraulic cylinder needs to retract, oil enters the lifting chamber 2A of the piston 2, which pulls the piston 2 to slide back.

[0036] The cylinder body 1 can be configured as a split structure. The cylinder body 1 includes a cylinder barrel 11. Both ends of the cylinder barrel 11 are respectively sealed with end caps. Specifically, one end of the cylinder barrel 11 is provided with a first end cap 12, and the other end of the cylinder barrel 11 is provided with a second end cap 13. The piston 2 extends out from the second end cap 13. A sealing structure is provided at the connection between the first end cap 12 and the cylinder barrel 11, and a sealing structure is also provided at the connection between the second end cap 13 and the cylinder barrel 11.

[0037] As a preferred technical solution of this embodiment, the cylinder 11 includes a cylinder liner 111 and an outer fiber 112. Both the cylinder liner 111 and the outer fiber 112 are cylindrical, and the outer fiber 112 is attached to the outer surface of the cylinder liner 111.

[0038] As a preferred technical solution in this embodiment, the cylinder 11 and the two end caps can be connected by welding or fasteners. The sealing structure between the cylinder 11 and the first end cap 12 includes at least two sealing rings, and the sealing structure between the cylinder 11 and the second end cap 13 also includes at least two sealing rings.

[0039] The piston component 2 is slidably assembled inside the cylinder body 1. The piston component 2 includes a first piston rod 21 and a first piston 22. The first piston rod 21 and the first piston 22 can be integrally set or separately set and then fixedly connected into one piece. The first piston 22 is slidably engaged with the cylinder barrel 11 of the cylinder body 1. The first piston rod 21 extends through the second end cap 13, and an inner cavity is formed inside the piston component 2.

[0040] As a preferred technical solution in this embodiment, an inner cavity is formed between the first piston rod 21 and the first piston 22.

[0041] As a preferred embodiment, the piston 2 divides the cylinder 1 into a pressurized chamber 1A and a rod chamber 1B. When oil enters the pressurized chamber 1A, it can drive the piston 2 to extend, thus connecting the pressurized chamber 1A and the rod chamber 1B. Preferably, the first piston 22 is provided with an oil guide port 221, which penetrates the first piston 22, thereby connecting the pressurized chamber 1A and the rod chamber 1B.

[0042] The built-in piston 3 is fixedly assembled inside the cylinder body 1, and extends into the inner cavity of the piston component 2. The built-in piston 3 includes a second piston rod 31 and a second piston 32. The second piston rod 31 and the second piston 32 can be integrally set or separately set and then fixedly connected into one piece. The second piston rod 31 is fixedly assembled on the first end cap 12, and the second piston 32 is located in the inner cavity of the piston component 2.

[0043] As a preferred technical solution in this embodiment, the second piston rod 31 is inserted and fixed on the first end cover 12, and the end face of the second piston rod 31 away from the second piston 32 is flush with the outer surface of the first end cover 12.

[0044] As a preferred technical solution of this embodiment, a through hole communicating with the inner cavity is formed on the first piston 22, and the second piston rod 31 extends into the inner cavity through the through hole. The first piston 22 and the second piston rod 31 are slidably engaged, and the second piston 32 is slidably engaged with the inner wall of the first piston rod 21.

[0045] As a preferred technical solution in this embodiment, the built-in piston 3 divides the inner cavity of the piston 2 into a lifting chamber 2A and a pressure relief chamber 2B. When oil enters the lifting chamber 2A, the piston 2 can retract.

[0046] For each of the aforementioned cavities, an oil port is formed accordingly. Specifically, a pressurizing oil port 121 is provided for the pressurizing cavity 1A; a lifting oil port 311 is provided for the lifting cavity 2A; and an oil drain port 211 is provided for the depressurizing cavity 2B.

[0047] As a preferred technical solution of this embodiment, the pressurization port 121 is provided on the cylinder body 1, specifically on the first end cover 12; the lifting port 311 is provided on the built-in piston 3, specifically on the second piston rod 31; and the drain port 211 is provided on the piston member 2, specifically on the first piston rod 21.

[0048] To ensure sealing, sealing structures are also provided between the components of the hydraulic cylinder. Specifically, a sealing structure is provided between the first piston rod 21 of piston component 2 and the second end cover 13, a sealing structure is provided between the first piston rod 21 of piston component 2 and the second piston 32 of the built-in piston 3, and a sealing structure is provided between the first piston 22 of piston component 2 and the second piston rod 31 of the built-in piston 3. The sealing structure can be, but is not limited to, a sealing ring.

[0049] To provide guidance, guide structures are also provided between the components of the hydraulic cylinder. Specifically, a guide structure is provided between the first piston rod 21 of the piston component 2 and the second end cap 13, and a guide structure is provided between the second piston rod 31 of the built-in piston 3 and the first piston 21 of the piston component 2. The guide structure can be, but is not limited to, a guide ring.

[0050] To prevent dust accumulation, a dustproof structure is provided between the second end cover 13 and the cylinder 11. The dustproof structure is optional, but not limited to, a dustproof ring.

[0051] Based on the above structure, the hydraulic cylinder in this embodiment operates as follows:

[0052] When the hydraulic cylinder extends, oil enters through the pressurization port 121, and the oil enters the pressurization chamber 1A, causing the piston 2 to extend, thus realizing the movement from... Figures 2 to 3 During the extension process, the oil in the rod chamber 1B enters the pressurizing chamber 1A through the oil guide port 221, the lifting chamber 2A discharges the oil through the lifting oil port 311, and the pressure relief chamber 2B draws oil from the drain oil port 211. When the piston 2 reaches the designated position, the pressurizing oil port 121 gradually increases to the required pressure, thus realizing the pressurizing function.

[0053] When the hydraulic cylinder retracts, oil enters through the lifting port 311 and returns through the pressurizing port 121, causing the piston 2 to retract, thus achieving the desired effect. Figures 3 to 2 During the retraction process, the high-pressure oil entering through the lifting port 311 enters the lifting chamber 2A. Part of the oil in the pressurizing chamber 1A is discharged through the pressurizing port 121, and part of it enters the rod chamber 1B through the guide port 221. The oil in the pressure relief chamber 2B is discharged through the drain port 211.

[0054] The hydraulic cylinder in this embodiment can provide thrust and pull without the need for an additional lifting cylinder; the pressurization chamber and the rod chamber are connected, and there is no need to consider sealing between the piston and the cylinder body. Therefore, the hydraulic cylinder can be made into a large-diameter cylinder, which can withstand greater oil pressure and output greater thrust, and can be used as a heavy-duty hydraulic cylinder for large presses.

[0055] Example 2

[0056] This embodiment is basically the same as Embodiment 1, except that a gap is formed between the first piston 22 and the cylinder barrel 11 of the cylinder body 1, and the pressurization chamber 1A and the rod chamber 1B are connected through this gap. Specifically, multiple gaps can be provided, and the multiple gaps are discretely and uniformly distributed along the outer periphery of the first piston 22.

[0057] Based on the above structure, the working mode of the hydraulic cylinder in this embodiment when it extends and retracts is basically the same as that in Embodiment 1. The difference is that the pressurizing chamber 1A and the rod chamber 1B are connected through the gap, and the oil flows between the two chambers through the gap.

[0058] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hydraulic cylinder, characterized in that, include: Cylinder block (1); Piston component (2), which is slidably assembled in the cylinder body (1), the piston component (2) divides the cylinder body (1) into a pressurizing chamber (1A) and a rod chamber (1B), the pressurizing chamber (1A) and the rod chamber (1B) are connected; An internal piston (3) is fixedly assembled inside the cylinder (1). The internal piston (3) extends into the piston component (2) and divides the interior of the piston component (2) into a lifting chamber (2A) and a pressure relief chamber (2B).

2. A hydraulic cylinder according to claim 1, characterized in that, The piston component (2) includes a first piston rod (21) and a first piston (22), and an inner cavity is formed between the first piston rod (21) and the first piston (22).

3. A hydraulic cylinder according to claim 2, characterized in that, An oil guide port (221) is formed on the first piston (22), and the pressurized chamber (1A) and the rod chamber (1B) are connected through the oil guide port (221).

4. A hydraulic cylinder according to claim 2, characterized in that, A gap is formed between the first piston (22) and the inner wall of the cylinder (1), and the pressurized chamber (1A) and the rod chamber (1B) are connected through the gap.

5. A hydraulic cylinder according to any one of claims 2-4, characterized in that, The built-in piston (3) includes a second piston rod (31) and a second piston (32). One end of the second piston rod (31) is fixed to the cylinder (1), and the other end of the second piston rod (31) is provided with the second piston (32). The second piston (32) is located in the inner cavity.

6. A hydraulic cylinder according to claim 5, characterized in that, A sealing structure is provided between the second piston rod (31) and the first piston, between the second piston and the first piston rod (21), and between the first piston rod (21) and the cylinder (1).

7. A hydraulic cylinder according to claim 5, characterized in that, A guide structure is provided between the second piston rod (31) and the first piston, and between the first piston rod (21) and the cylinder (1).

8. A hydraulic cylinder according to claim 1, characterized in that, A pressurized oil port (121) is formed on the cylinder body (1), and the pressurized oil port (121) is connected to the pressurized chamber (1A). A lifting oil port (311) is provided on the built-in piston (3), and the lifting oil port (311) is connected to the lifting chamber (2A). An oil drain port (211) is provided on the built-in piston (3) or the piston component (2), and the oil drain port (211) is connected to the pressure relief chamber (2B).

9. A hydraulic cylinder according to claim 1, characterized in that, The cylinder body (1) includes a cylinder barrel (11), and end caps are respectively sealed at both ends of the cylinder barrel (11). The built-in piston (3) is fixedly assembled on one end cap, and the piston component (2) slides through the other end cap.

10. A hydraulic cylinder according to claim 9, characterized in that, The cylinder (11) includes a cylinder liner (111) and an outer fiber (112), the outer fiber (112) being attached to the outer surface of the cylinder liner (111).

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