Double-ejection-rod oil cylinder

Abstract

According to the technical scheme, the double-outlet-rod oil cylinder is characterized in that the double-outlet-rod oil cylinder comprises a cylinder body, the cylinder body is of a barrel-shaped structure with the two ends open, and a first oil port connector, a second oil port connector and a third oil port connector which are communicated with the interior of the cylinder body are evenly arranged on the outer wall of the cylinder body in the length direction; the two piston assemblies are telescopically and symmetrically mounted in the openings in the two ends of the cylinder body respectively; the limiting block is connected to the axial center position of the outer side of the cylinder body, one end of the limiting block penetrates into the cylinder body and is located between the two piston assemblies, and the two ends of the oil pipe are connected with the side wall of the cylinder body correspondingly and communicate with the first oil port connector and the third oil port connector correspondingly. The double-outlet-rod oil cylinder is simple and compact in structure, simple in process and convenient to use. A spliced oil cylinder is not needed, and synchronous recovery of the pistons on the two sides can be achieved through oil passing of one oil port.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic technology, and in particular to a double-rod hydraulic cylinder. Background Technology

[0002] A double-rod hydraulic cylinder allows the piston rods on both sides to extend synchronously when oil is supplied through one port. However, for both piston rods to retract synchronously, oil must be supplied to the rod chambers on both sides simultaneously. Furthermore, to limit the retraction of the piston rods, traditional double-rod hydraulic cylinders typically use a small-diameter steel pipe in the middle, with additional steel pipes welded to the sides. However, when the cylinder structure is compact or the installation space is limited, this structure is difficult to meet the requirements. Utility Model Content

[0003] The technical problem solved by this utility model is that when the cylinder structure is relatively compact or the installation space is small, traditional double-rod cylinders are difficult to meet the usage requirements.

[0004] To solve the above-mentioned technical problems, the present invention provides a double-rod hydraulic cylinder, comprising:

[0005] The cylinder body has a cylindrical structure with openings at both ends, and the outer wall of the cylinder body is uniformly provided with a first oil port connector, a second oil port connector, and a third oil port connector that communicate with the interior of the cylinder body in the length direction.

[0006] Two piston assemblies are symmetrically and retractably installed in the openings at both ends of the cylinder body;

[0007] A limiting block is connected at the axial center position on the outer side of the cylinder body, with one end extending into the interior of the cylinder body and located between the two piston assemblies.

[0008] The oil pipe is connected to the side wall of the cylinder body at both ends, and is connected to the first oil port connector and the third oil port connector respectively.

[0009] Optionally, the portion of the limiting block located inside the cylinder restricts the retraction stroke of the piston assembly, while the portion located outside the cylinder serves as an external mechanical limit.

[0010] Optionally, each of the piston assemblies includes:

[0011] The piston rod is inserted into the opening of the cylinder.

[0012] A piston is located inside the cylinder and is connected to the tail of the piston rod via a nut;

[0013] A dust seal ring and a shaft seal ring are respectively disposed inside the cylinder body and located at the opening, and are fitted over the piston rod, with the shaft seal ring located inside the dust seal ring; and

[0014] An end cap, which is sealed and detachably connected to the end of the cylinder body and sleeved over the piston rod, is located outside the dust seal.

[0015] Optionally, the second oil port connector is connected to the rodless chamber of the cylinder, and the first oil port connector and the third oil port connector are respectively connected to the corresponding rod chamber of the cylinder. Oil is introduced through the second oil port connector to achieve synchronous extension of the two piston rods, and oil is introduced through the first oil port connector or the third oil port connector to achieve synchronous retraction of the two piston rods.

[0016] Optionally, each of the two pistons is provided with a piston sealing ring to isolate the rod chamber and the rodless chamber in the cylinder.

[0017] Optionally, the piston, the piston rod, the shaft seal ring, and the cylinder body form the rod chamber.

[0018] Optionally, the rodless chamber is formed between the two pistons and the cylinder.

[0019] Optionally, the second oil port connector is connected to the rodless chamber, and the first oil port connector and the third oil port connector are respectively connected to the two rod chambers.

[0020] The beneficial effects of this utility model's technical solution are:

[0021] This utility model features a simple and compact double-rod hydraulic cylinder structure, easy manufacturing process, and convenient use. It eliminates the need for modular cylinders and allows for synchronous retraction of the pistons on both sides via a single oil port. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the double-rod hydraulic cylinder in an embodiment of this utility model;

[0023] Figure 2 This is a top view of the double-rod hydraulic cylinder in an embodiment of this utility model;

[0024] Figure 3 This is a schematic diagram showing the positional relationship between the oil port, oil pipe, and limiting block in an embodiment of this utility model. Detailed implementation method:

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 of this utility model.

[0027] 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 indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] Please see Figure 1 , Figure 2 and Figure 3The diagram illustrates an embodiment of a double-rod hydraulic cylinder, comprising a cylinder body 9, which is a cylindrical structure with openings at both ends. A first oil port connector 10, a second oil port connector 11, and a third oil port connector 12 are evenly arranged along the length of the outer wall of the cylinder body 9, communicating with the interior of the cylinder body 9. Two piston assemblies are symmetrically and retractably installed in the openings at both ends of the cylinder body 9. A limiting block 14 is connected to the axial center of the outer side of the cylinder body 9, with one end penetrating into the interior of the cylinder body 9 and located between the two piston assemblies. An oil pipe 13 is also shown, with both ends connected to the side walls of the cylinder body 9 and communicating with the first oil port connector 10 and the third oil port connector 12, respectively.

[0031] In this embodiment, the portion of the limiting block 14 located inside the cylinder 9 restricts the retraction stroke of the piston assembly, while the portion located outside the cylinder 9 is used for external mechanical limiting.

[0032] In this embodiment, each piston assembly includes a piston rod 1, which is inserted into the opening of the cylinder 9; a piston 6, which is located inside the cylinder 9 and connected to the tail of the piston rod 1 by a nut 8; a dust seal 2 and a shaft seal 4, which are respectively located inside the cylinder 9 and at the opening, and are sleeved on the outside of the piston rod 1, with the shaft seal 4 located inside the dust seal 2; and an end cap 6, which is sealed and detachably connected to the end of the cylinder 9 and sleeved on the outside of the piston rod 1, with the end cap 3 located outside the dust seal 2.

[0033] In this embodiment, the second oil port connector 11 is connected to the rodless chamber of the cylinder 9, and the first oil port connector 10 and the third oil port connector 12 are respectively connected to the corresponding rod chambers of the cylinder 9. Oil is introduced through the second oil port connector 11 to achieve synchronous extension of the two piston rods, and oil is introduced through the first oil port connector 10 or the third oil port connector 12 to achieve synchronous retraction of the two piston rods.

[0034] In this embodiment, the two pistons 6 are respectively provided with piston sealing rings 7, which are used to isolate the rod chamber and the rodless chamber in the cylinder 9.

[0035] In this embodiment, a rod chamber 15 is formed between the piston 6, piston rod 1, shaft seal ring 4 and cylinder 9.

[0036] In this embodiment, a rodless chamber 16 is formed between the two pistons 6 and the cylinder 9.

[0037] In this embodiment, the second oil port connector 11 is connected to the rodless chamber 16, and the first oil port connector 10 and the third oil port connector 12 are respectively connected to the two rod chambers 15.

[0038] The following description will further illustrate the characteristics and functions of this utility model.

[0039] This embodiment provides a double-rod hydraulic cylinder, including a cylinder body, piston rod, end cap, piston, nut, etc. The cylinder body has three oil port connectors on its outer circumference (i.e., first oil port connector 10, second oil port connector 11, and third oil port connector 12, the first oil port connector 10 and the third oil port connector 12 are connected by an oil pipe 13), oil pipe, limiting block, etc. The exposed part of the limiting block serves to limit the hydraulic cylinder, while the part inside the cylinder limits the retraction length of the piston rod. When located in the middle of the cylinder body, the stroke length on both sides is consistent. The oil pipe connects the left and right sides of the cylinder body, allowing the two rod chambers to communicate with each other. The piston rod is cylindrical, with an ear hole at one end for connecting a working device, and a threaded end for installing the piston and locking nut. The end cap is connected to the cylinder body to form a sealed working cavity and limits the extension length of the piston rod. This double-rod hydraulic cylinder solves the problems of fixed space and cumbersome connection of conventional hydraulic cylinders, and is easy to assemble and disassemble.

[0040] Specifically, the piston rod, piston, and end cap are all in pairs, installed on the left and right sides of the cylinder body respectively. The piston rod is cylindrical, with an ear hole at one end for connecting to the working device, and the other end for connecting to the piston and nut. The limiting block is welded and fixed after being perforated on the cylinder body. The part exposed on the outside of the cylinder body serves as a limiting function when the cylinder is working, while the part inside the cylinder body serves as a limiting function when the piston rod retracts. The limiting block is generally located at the center of the cylinder body's axis, ensuring consistent stroke on both sides. The oil pipe is welded to the left and right sides of the cylinder body, allowing the two rod-side working chambers to communicate with each other. There are three oil port connectors on the outer circumference of the cylinder body, which can be welded or directly machined. The middle oil port connects to the rodless chamber, and when oil enters through this port, the piston rods on both sides extend synchronously. Only one of the oil port connectors on the left and right sides needs to be filled with oil to achieve synchronous retraction of the two piston rods. The radial angle of the limiting block can be adjusted according to actual needs. When the axis is located at the center, the cylinder is not distinguished by left or right, and either the left or right oil port can be connected during use.

[0041] In summary, the double-rod hydraulic cylinder of this invention has a simple and compact structure, is easy to manufacture, and is convenient to use. It eliminates the need for modular hydraulic cylinders and allows for synchronous retraction of the pistons on both sides through a single oil port.

[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double rod cylinder characterized by, include: The cylinder body has a cylindrical structure with openings at both ends, and the outer wall of the cylinder body is uniformly provided with a first oil port connector, a second oil port connector, and a third oil port connector that communicate with the interior of the cylinder body in the length direction. Two piston assemblies are symmetrically and retractably installed in the openings at both ends of the cylinder body; A limiting block is connected at the axial center position on the outer side of the cylinder body, with one end extending into the interior of the cylinder body and located between the two piston assemblies. The oil pipe is connected to the side wall of the cylinder body at both ends, and is connected to the first oil port connector and the third oil port connector respectively.

2. The dual rod cylinder of claim 1, wherein, The portion of the limiting block located inside the cylinder restricts the retraction stroke of the piston assembly, while the portion located outside the cylinder serves as an external mechanical limit.

3. The dual rod cylinder of claim 2, wherein, Each of the piston assemblies includes: The piston rod is inserted into the opening of the cylinder. A piston is located inside the cylinder and is connected to the tail of the piston rod via a nut; A dust seal ring and a shaft seal ring are respectively disposed inside the cylinder body and located at the opening, and are fitted over the piston rod, with the shaft seal ring located inside the dust seal ring; and An end cap, which is sealed and detachably connected to the end of the cylinder body and sleeved over the piston rod, is located outside the dust seal.

4. The dual rod cylinder of claim 3, wherein, The second oil port connector is connected to the rodless chamber of the cylinder body, and the first oil port connector and the third oil port connector are respectively connected to the corresponding rod chamber of the cylinder body. Oil is introduced through the second oil port connector to achieve synchronous extension of the two piston rods, and oil is introduced through the first oil port connector or the third oil port connector to achieve synchronous retraction of the two piston rods.

5. The dual rod cylinder of claim 4, wherein, The two pistons are each provided with a piston sealing ring to isolate the rod chamber and the rodless chamber in the cylinder.

6. The dual rod cylinder of claim 5, wherein, The piston, the piston rod, the shaft seal ring, and the cylinder body form the rod chamber.

7. The dual rod cylinder of claim 6, wherein, The rodless chamber is formed between the two pistons and the cylinder.

8. The dual rod cylinder of claim 7, wherein, The second oil port connector is connected to the rodless chamber, and the first oil port connector and the third oil port connector are respectively connected to the two rod chambers.

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