Single-piston-rod oil cylinder with same push-pull force

Abstract

The single-piston-rod oil cylinder with the same push-pull force comprises a cylinder barrel, a front cylinder cover and a rear cylinder cover, a first inner cavity is formed in the cylinder barrel, a first piston rod is arranged in the first inner cavity, a piston piece is arranged at the rear end of the first piston rod, the front end of the first piston rod extends out of the front cylinder cover, and the rear end of the first piston rod extends out of the rear cylinder cover. A second inner cavity is formed in the first piston rod, and a second piston rod is arranged in the second inner cavity. A first oil port communicated with the first inner cavity is formed in the front cylinder cover, a channel communicated with the second inner cavity is formed in the second piston rod, and a second oil port communicated with the channel is formed in the rear cylinder cover. The total oil pressure stress area of the piston piece in the first inner cavity is equal to the oil pressure stress area of the first piston rod in the second inner cavity of the first piston rod, so that the oil cylinder can generate the same pushing force and pulling force only through the same pressure of the front oil port and the rear oil port, and a hydraulic system is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic oil cylinder structures, in particular to a single-rod oil cylinder with the same push and pull forces. Background Art

[0002] The single-rod hydraulic cylinder is mainly composed of a hydraulic cylinder body, a piston, a seal and a rod. The piston makes reciprocating linear motion in the cylinder body through the pressure of the liquid, thereby driving the rod to perform corresponding actions. In the hydraulic system, the single-rod hydraulic cylinder is usually used in combination with a hydraulic pump, a hydraulic control valve and a hydraulic oil pipe to achieve various mechanical actions.

[0003] Traditional single-rod cylinders have different oil pressure force areas in the rod chamber and the rodless chamber. In order to achieve the same push and pull force, different pressures are required at the two oil ports. This requires a relatively complex design structure for the hydraulic system, which is costly and difficult to operate, and needs to be improved. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, a single-rod oil cylinder with the same push and pull forces is provided.

[0005] The utility model solves the technical problem by adopting the following technical solution: a single-rod oil cylinder with the same push-pull force comprises a cylinder barrel, the front end and the rear end of the cylinder barrel are respectively provided with a front cylinder cover and a rear cylinder cover, the cylinder barrel has a first inner cavity, a first piston rod is provided in the first inner cavity, a piston member is provided at the rear end of the first piston rod, the front end of the first piston rod extends out of the front cylinder cover, a second inner cavity is provided inside the first piston rod, and a second piston rod is provided in the second inner cavity;

[0006] The front cylinder cover is provided with a first oil port communicating with the first inner cavity, the second piston rod is provided with a channel communicating with the second inner cavity, and the rear cylinder cover is provided with a second oil port communicating with the channel;

[0007] The total oil pressure force area of ​​the piston member in the first inner cavity is equal to the oil pressure force area of ​​the first piston rod in the second inner cavity of its rod body;

[0008] By adopting the above technical solution, when the force area of ​​the piston rod in the forward and backward directions is the same, the front and rear oil ports only need the same pressure to ensure the same push and pull force of the cylinder. This simplifies the hydraulic system and no longer requires complex additional equipment and connection structures that can provide different oil pressures, making operation easier.

[0009] Furthermore, sealing rings are provided between the piston member and the inner wall of the cylinder and between the piston member and the outer wall of the second piston rod described in the utility model. Different numbers and specifications of sealing members can be used according to actual needs to achieve sealing and oil-proof effects.

[0010] Furthermore, a sealing ring is provided between the first piston rod and the front cylinder cover of the utility model.

[0011] The beneficial effect of the utility model is that the utility model improves the structure of the existing single-rod oil cylinder so that the oil pressure force area of ​​the piston rod in the two active directions of forward and backward is equal, so that the front and rear oil ports only need the same pressure to achieve the same thrust and pull of the cylinder, further simplifying the hydraulic system and helping to reduce various costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a structural schematic diagram of the utility model.

[0014] Numbers in the figure: 1. cylinder barrel, 2. front cylinder head, 3. rear cylinder head, 4. first inner cavity, 5. first piston rod, 6. piston member, 7. second inner cavity, 8. second piston rod, 9. first oil port, 10. channel, 11. second oil port, 12. sealing ring, 13. sealing ring. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0016] like Figure 1A single-rod oil cylinder with the same push and pull force as shown in the figure comprises a cylinder barrel 1, a front cylinder cover 2 and a rear cylinder cover 3 are respectively arranged at the front and rear ends of the cylinder barrel 1, a first inner cavity 4 is arranged in the cylinder barrel 1, a first piston rod 5 is arranged in the first inner cavity 4, a piston member 6 is arranged at the rear end of the first piston rod 5, the front end of the first piston rod 5 extends out of the front cylinder cover 2, a second inner cavity 7 is arranged in the first piston rod 5, and a second piston rod 8 is arranged in the second inner cavity 7;

[0017] The front cylinder cover 2 is provided with a first oil port 9 communicating with the first inner cavity 4, the second piston rod 8 is provided with a channel 10 communicating with the second inner cavity 7, and the rear cylinder cover 3 is provided with a second oil port 11 communicating with the channel 10;

[0018] The total oil pressure force area of ​​the piston member 6 in the first inner cavity 4 is equal to the oil pressure force area of ​​the first piston rod 5 in the second inner cavity 7 of its rod body;

[0019] A sealing ring 12 is provided between the piston member 6 and the inner wall of the cylinder barrel 1 and between the piston member 6 and the outer wall of the second piston rod 8. A sealing ring 13 is provided between the first piston rod 5 and the front cylinder cover 2.

[0020] Since the final force-bearing area of ​​the first piston rod in the two inner cavities is the same, the front and rear oil ports only need the same pressure to ensure the same push and pull force of the cylinder, which simplifies the hydraulic system and makes the equipment and connections more concise, simple to operate, and has a low failure rate.

[0021] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A single-rod oil cylinder with the same push and pull forces, characterized in that: The invention comprises a cylinder barrel (1), wherein the front end and the rear end of the cylinder barrel (1) are respectively provided with a front cylinder cover (2) and a rear cylinder cover (3), wherein the cylinder barrel (1) has a first inner cavity (4), wherein a first piston rod (5) is provided in the first inner cavity (4), wherein a piston member (6) is provided at the rear end of the first piston rod (5), wherein the front end of the first piston rod (5) extends out of the front cylinder cover (2), wherein a second inner cavity (7) is provided in the first piston rod (5), wherein a second piston rod (8) is provided in the second inner cavity (7); The front cylinder cover (2) is provided with a first oil port (9) communicating with the first inner cavity (4), the second piston rod (8) is provided with a channel (10) communicating with the second inner cavity (7), and the rear cylinder cover (3) is provided with a second oil port (11) communicating with the channel (10); The total oil pressure force area of ​​the piston member (6) in the first inner cavity (4) is equal to the oil pressure force area of ​​the first piston rod (5) in the second inner cavity (7) in the rod body.

2. A single-rod oil cylinder with equal push and pull forces as claimed in claim 1, characterized in that: Sealing rings (12) are provided between the piston member (6) and the inner wall of the cylinder (1), and between the piston member (6) and the outer wall of the second piston rod (8).

3. A single-rod oil cylinder with equal push and pull forces as claimed in claim 1, characterized in that: A sealing ring (13) is provided between the first piston rod (5) and the front cylinder cover (2).

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