Multi-speed hydraulic cylinder

Abstract

The utility model provides a multi-speed hydraulic cylinder which comprises a cylinder barrel, a first piston rod is movably installed in the cylinder barrel, a first piston rod outer sealing assembly is arranged at the position, close to the end, of the first piston rod, a first oil cavity and a second oil cavity are formed in the two ends of the first piston rod outer sealing assembly respectively, and a first oil port is communicated with the first oil cavity. The second oil port is communicated with the second oil cavity; the first piston rod is of a hollow structure, the second piston rod is movably installed in a hollow cavity of the first piston rod, a second piston assembly is arranged at the end of the second piston rod and divides the cavity into a third oil cavity and a fourth oil cavity, the third oil port is communicated with the third oil cavity, and the fourth oil port is communicated with the fourth oil cavity. By the adoption of the structure, oil is supplied to the oil ports respectively or simultaneously, various working speeds can be adjusted and output according to load requirements, and the working efficiency of the hydraulic cylinder is greatly improved. And the arranged piston rod opening instrument can accurately control the extension length of the piston rod.

Description

Technical Field

[0001] The utility model relates to the field of hydraulic cylinders, in particular to a multi-speed hydraulic cylinder. Background Art

[0002] During the gate opening and closing process, the gate loads are different in high head and low head conditions. In high head conditions, the load is higher due to the influence of lateral water pressure. In the prior art, the gate is lifted at a uniform speed, and the lifting efficiency is low. How to change the gate lifting speed according to the load adaptability is a technical problem in the prior art. Hydraulic cylinders are also required to have different execution speeds in other fields. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a multi-speed hydraulic cylinder, which can dynamically adjust the lifting speed of the hydraulic cylinder according to working conditions and improve the speed of opening and closing of the gate.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a multi-speed hydraulic cylinder, including a cylinder barrel, a first piston rod movably installed in the cylinder barrel, a first piston rod outer sealing assembly is provided at a position close to the end of the first piston rod, two ends of the first piston rod outer sealing assembly respectively constitute a first oil chamber and a second oil chamber, a first oil port is connected to the first oil chamber, and the second oil port is connected to the second oil chamber;

[0005] The first piston rod is a hollow structure, the second piston rod is movably installed in the hollow cavity of the first piston rod, a second piston assembly is provided at the end of the second piston rod, the second piston assembly divides the cavity into a third oil chamber and a fourth oil chamber, the third oil port is connected to the third oil chamber, and the fourth oil port is connected to the fourth oil chamber.

[0006] In a preferred solution, the first oil port and the second oil port are arranged on the outer wall of the cylinder.

[0007] In a preferred embodiment, an oil port section is provided at the end of the cylinder away from the first piston rod, and the third oil port and the fourth oil port are arranged on the oil port section. The third oil port is connected to the third oil chamber through a third oil chamber oil circuit located in the center of the second piston rod, and the fourth oil port is connected to the fourth oil chamber through a fourth oil chamber oil circuit located in the annular cavity of the second piston rod.

[0008] In a preferred solution, a plurality of fourth oil chamber oil ports are provided at positions of the second piston rod close to the second piston assembly, and the fourth oil chamber oil ports are connected to the fourth oil chamber and the fourth oil chamber oil circuit.

[0009] In a preferred solution, a sealing guide assembly is further provided on the inner wall of the cavity of the first piston rod at one end away from the second piston assembly, and the sealing guide assembly and the second piston rod form a sliding seal.

[0010] In a preferred embodiment, an acceleration oil port is provided at a position of the second piston rod near the sealing guide assembly. When the first piston rod retracts, the acceleration oil port is blocked by the sealing guide assembly. When the first piston rod extends, the acceleration oil port connects the third oil chamber oil circuit with the second oil chamber.

[0011] In a preferred solution, a first oil chamber exhaust port and a second oil chamber exhaust port are provided on the outer wall of the cylinder;

[0012] A third oil chamber exhaust port is provided at a position of the first piston rod near the end, and the third oil chamber exhaust port is connected to the third oil chamber from the end through a pipeline in the cavity of the first piston rod.

[0013] In a preferred solution, an oil chamber inspection port is provided at a position of the third oil chamber end cover close to the third oil chamber.

[0014] In a preferred solution, a piston rod opening meter is provided at a position of the cylinder barrel close to the first piston rod end;

[0015] The piston rod opening meter adopts a Hall sensor or a photoelectric sensor to detect the stroke of the first piston rod.

[0016] In a preferred solution, an extension pipeline is provided on the outer wall of the cylinder barrel, and the first oil port is connected to the first extension oil port near the oil port section through the extension pipeline;

[0017] The second oil port is communicated with the first extension oil port.

[0018] The utility model provides a multi-speed hydraulic cylinder, which adopts the above structure to supply oil to each oil port separately or simultaneously, and can adjust the output of multiple working speeds according to load requirements, greatly improving the efficiency of gate opening and closing or other work. The piston rod opening meter can accurately control the extension length of the piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a front sectional view of the utility model.

[0021] Figure 2 It is a top view of the utility model.

[0022] Figure 3 It is the front view of the utility model.

[0023] In the figure: top cover 1, flange ring 2, locking nut 3, first piston rod 4, first piston rod sealing assembly 5, cylinder barrel 6, piston rod guide sleeve 7, first oil chamber 8, first piston rod outer sealing assembly 9, third oil chamber oil circuit 10, fourth oil chamber oil circuit 11, second oil chamber 12, third oil port 13, oil port section 14, fourth oil port 15, third oil chamber exhaust port 16, mounting seat 17, oil chamber inspection port 18, third oil chamber 19, second piston assembly 20, first oil chamber exhaust port 21, fourth oil chamber 22, second oil chamber exhaust port 23, fourth oil chamber oil port 24, second piston rod 25, acceleration oil port 26, first oil port 27, second oil port 28, first extension oil port 29, second extension oil port 30, extension pipeline 31, fourth oil chamber oil circuit 32, sealing guide assembly 33, third oil chamber end cover 34, piston rod opening meter 35. DETAILED DESCRIPTION

[0024] like Figures 1 to 3 A multi-speed hydraulic cylinder includes a cylinder barrel 6, a first piston rod 4 is movably installed in the cylinder barrel 6, a first piston rod outer sealing assembly 9 is provided near the end of the first piston rod 4, two ends of the first piston rod outer sealing assembly 9 respectively form a first oil chamber 8 and a second oil chamber 12, a first oil port 27 is connected to the first oil chamber 8, and a second oil port 28 is connected to the second oil chamber 12;

[0025] The first piston rod 4 is a hollow structure, and the second piston rod 25 is movably installed in the hollow cavity of the first piston rod 4. The second piston assembly 20 is provided at the end of the second piston rod 25. The second piston assembly 20 divides the cavity into a third oil cavity 19 and a fourth oil cavity 22. The third oil port 13 is connected to the third oil cavity 19, and the fourth oil port 15 is connected to the fourth oil cavity 22. The utility model is divided into four gears according to the working conditions, wherein the second oil port 28 and the fourth oil port 15 supply oil for the first gear, the ejection force is the largest and the extension speed is the lowest; the second oil port 28 supplies oil for the second gear, the ejection force is lower than the first gear, and the speed is higher than the first gear. The second oil port 28 and the first oil port 27 supply oil for the third gear, the ejection force is lower than the second gear, and the speed is higher than the second gear. The first oil port 27, the second oil port 28 and the third oil port 13 supply oil for the fourth gear, the ejection force is lower than the third gear, and the speed is higher than the third gear. With the above structure, different output speeds can be adjusted according to the working conditions. The utility model can be used not only for opening and closing dam gates, but also for operating deep-water mechanical arms.

[0026] The preferred solution is Figure 1 In the embodiment, the first oil port 27 and the second oil port 28 are arranged on the outer wall of the cylinder 6. A further preferred solution is as follows Figure 3 In the embodiment, an extension pipeline 31 is provided on the outer wall of the cylinder 6, and the first oil port 27 is connected to the first extension oil port 29 close to the oil port section 14 through the extension pipeline 31;

[0027] The second oil port 28 is communicated with the first extended oil port 29. With this structure, the installation of the pipeline is facilitated.

[0028] The preferred solution is Figure 1 , 2 In the embodiment, an oil port section 14 is provided at one end of the cylinder 6 away from the first piston rod 4, and the third oil port 13 and the fourth oil port 15 are provided on the oil port section 14. The third oil port 13 is connected to the third oil chamber 19 through the third oil chamber oil passage 10 located at the center of the second piston rod 25, and the fourth oil port 15 is connected to the fourth oil chamber 22 through the fourth oil chamber oil passage 11 located in the annular cavity of the second piston rod 25. With this structure, the third oil port 13 and the fourth oil port 15 are provided in a separate oil port section 14, which is convenient for the processing and sealing of the entire oil cylinder. Figure 1 , 2 In the embodiment, the oil port section 14 is fixedly connected to the cylinder barrel 6 by using a flange structure, and the end of the second piston rod 25 is fixedly connected to the end cover of the oil port section 14 by using screws.

[0029] The preferred solution is Figure 1 In the embodiment, a plurality of fourth oil chamber oil ports 24 are provided at a position of the second piston rod 25 near the second piston assembly 20, and the fourth oil chamber oil ports 24 are connected to the fourth oil chamber 22 and the fourth oil chamber oil path 11. Here, the plurality of fourth oil chamber oil ports 24 means that the fourth oil chamber oil ports 24 are arranged in plurality in the axial direction and in the circumferential direction on the second piston rod 25 to increase the flow cross section.

[0030] The preferred solution is Figure 1 In the embodiment, a sealing guide assembly 33 is further provided on the inner wall of the cavity of the first piston rod 4, at one end away from the second piston assembly 20, and the sealing guide assembly 33 and the second piston rod 25 form a sliding seal. Preferably, the sealing guide assembly 33 can also be regarded as an inner piston seal, so that a piston structure is formed between the sealing guide assembly 33 and the second piston rod 25. In this example, the sealing guide assembly 33 and the first piston rod outer sealing assembly 9 are not at corresponding positions in the axial direction of the first piston rod 4. The first piston rod outer sealing assembly 9 is close to the middle of the first piston rod 4, and the sealing guide assembly 33 is close to the end of the first piston rod 4.

[0031] The preferred solution is Figure 1 In the embodiment, an acceleration oil port 26 is provided at a position of the second piston rod 25 near the sealing guide assembly 33. When the first piston rod 4 is retracted, the acceleration oil port 26 is blocked by the sealing guide assembly 33. When the first piston rod 4 is extended, the acceleration oil port 26 connects the third oil chamber oil path 10 with the second oil chamber 12, so that the oil path from the second oil chamber 12 to the third oil chamber oil path 10 is supplied with oil at the same time.

[0032] The preferred solution is Figure 1 In the embodiment, a first oil chamber exhaust port 21 and a second oil chamber exhaust port 23 are provided on the outer wall of the cylinder 6;

[0033] A third oil chamber exhaust port 16 is provided near the end of the first piston rod 4 . The third oil chamber exhaust port 16 is connected to the third oil chamber 19 from the end through a pipeline in the cavity of the first piston rod 4 .

[0034] The preferred solution is Figure 1 In the embodiment, an oil chamber inspection port 18 is provided at a position of the third oil chamber end cover 34 close to the third oil chamber 19 .

[0035] The preferred solution is Figure 2 In the embodiment, a piston rod opening meter 35 is provided at a position of the cylinder 6 near the end of the first piston rod 4; preferably, the piston rod opening meter 35 uses a Hall sensor or a photoelectric sensor to detect the stroke of the first piston rod 4. In this example, the Hall sensor is used for detection, which is different from the structure of the prior art using a magnetic mass change sensor. The overall length of the utility model is relatively long, and the magnetic mass change sensor is difficult to install, and the detection rod itself is greatly affected by the length deformation, which also affects the detection accuracy.

[0036] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limitations of the present invention. The embodiments and features in the embodiments of the present application can be arbitrarily combined with each other without conflict. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A multi-speed hydraulic cylinder, characterized in that: The invention comprises a cylinder barrel (6), a first piston rod (4) movably mounted in the cylinder barrel (6), a first piston rod outer sealing assembly (9) being provided near the end of the first piston rod (4), two ends of the first piston rod outer sealing assembly (9) respectively forming a first oil chamber (8) and a second oil chamber (12), a first oil port (27) being connected to the first oil chamber (8), and a second oil port (28) being connected to the second oil chamber (12); The first piston rod (4) is a hollow structure. The second piston rod (25) is movably mounted in the hollow cavity of the first piston rod (4). A second piston assembly (20) is provided at the end of the second piston rod (25). The second piston assembly (20) divides the cavity into a third oil cavity (19) and a fourth oil cavity (22). The third oil port (13) is connected to the third oil cavity (19), and the fourth oil port (15) is connected to the fourth oil cavity (22).

2. A multi-speed hydraulic cylinder according to claim 1, characterized in that: The first oil port (27) and the second oil port (28) are arranged on the outer wall of the cylinder barrel (6).

3. A multi-speed hydraulic cylinder according to claim 1, characterized in that: An oil port section (14) is provided at one end of the cylinder barrel (6) away from the first piston rod (4), and a third oil port (13) and a fourth oil port (15) are provided on the oil port section (14). The third oil port (13) is connected to the third oil chamber (19) through a third oil chamber oil path (10) located at the center of the second piston rod (25), and the fourth oil port (15) is connected to the fourth oil chamber (22) through a fourth oil chamber oil path (11) located in the annular cavity of the second piston rod (25).

4. A multi-speed hydraulic cylinder according to claim 3, characterized in that: A plurality of fourth oil chamber oil ports (24) are provided at a position of the second piston rod (25) close to the second piston assembly (20); the fourth oil chamber oil ports (24) are connected to the fourth oil chamber (22) and the fourth oil chamber oil path (11).

5. A multi-speed hydraulic cylinder according to claim 4, characterized in that: A sealing guide assembly (33) is also provided on the inner wall of the cavity of the first piston rod (4) at one end away from the second piston assembly (20), and the sealing guide assembly (33) and the second piston rod (25) form a sliding seal.

6. A multi-speed hydraulic cylinder according to claim 5, characterized in that: An acceleration oil port (26) is provided at a position of the second piston rod (25) close to the sealing guide assembly (33); when the first piston rod (4) is retracted, the acceleration oil port (26) is blocked by the sealing guide assembly (33); when the first piston rod (4) is extended, the acceleration oil port (26) connects the third oil chamber oil path (10) with the second oil chamber (12).

7. A multi-speed hydraulic cylinder according to claim 1, characterized in that: The outer wall of the cylinder barrel (6) is provided with a first oil chamber exhaust port (21) and a second oil chamber exhaust port (23); A third oil chamber exhaust port (16) is provided near the end of the first piston rod (4), and the third oil chamber exhaust port (16) is connected to the third oil chamber (19) from the end through a pipeline in the cavity of the first piston rod (4).

8. A multi-speed hydraulic cylinder according to claim 1, characterized in that: An oil chamber inspection port (18) is provided at a position of the third oil chamber end cover (34) close to the third oil chamber (19).

9. A multi-speed hydraulic cylinder according to claim 1, characterized in that: A piston rod opening gauge (35) is provided at a position of the cylinder barrel (6) close to the end of the first piston rod (4); The piston rod opening meter (35) uses a Hall sensor or a photoelectric sensor to detect the stroke of the first piston rod (4).

10. A multi-speed hydraulic cylinder according to claim 3, characterized in that: An extension pipeline (31) is provided on the outer wall of the cylinder barrel (6), and the first oil port (27) is connected to a first extension oil port (29) close to the oil port section (14) through the extension pipeline (31); The second oil port (28) is in communication with the first extension oil port (29).

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