A multi-stage servo hydraulic electric cylinder

Abstract

The utility model discloses a multi-stage servo hydraulic electric cylinder, including a power unit and a driving unit. The power unit includes an electric cylinder and a liquid storage cylinder arranged on the same axis. A piston is arranged in the liquid storage cylinder, and the piston divides the liquid storage cylinder into a cavity and a liquid cavity. The electric cylinder is connected to one end of the liquid cavity of the liquid storage cylinder, and the driving end of the electric cylinder extends into the cavity and is connected to the piston. The driving unit includes a driving cylinder provided with a driving cavity, one end of the driving cavity is connected to the liquid cavity, and the other end is provided with a multi-stage push rod. After the pressurized liquid in the liquid cavity enters the driving cavity, the multi-stage push rod is pushed to extend and retract step by step. The utility model uses the electric cylinder as a power source to drive the piston movement in the liquid storage cylinder, so that the pressurized liquid enters the multi-stage driving cylinder, thereby driving the multi-stage push rod to extend and retract step by step, saving parts such as hydraulic stations, electro-hydraulic valve components, liquid pipes, pumps, etc., simplifying the structure, reducing the volume of the cylinder body, low manufacturing and maintenance costs, precise control, reliable use, simple and convenient installation, and is suitable for high-precision multi-stage drive conditions.

Description

Technical Field

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

[0002] Although hydraulic cylinders have good output capacity and are suitable for multi-stage drive conditions, they require additional hydraulic stations as power sources. The installation is complex and requires hydraulic pipes, pumps, filtration systems, etc. Precise positioning requires precise electro-hydraulic valve components, which makes the control and use process more complicated, the maintenance cost is high, and there are certain limitations.

[0003] Although electric cylinders have the advantages of simple installation, direct compatibility with other electronic control systems, precise positioning, good economy, and good repeatability, they require a complex lead screw assembly for a multi-stage drive structure, which increases the size of the cylinder and the cost. In addition, the drive range is relatively limited, making it difficult to apply to multi-stage drive conditions.

[0004] Therefore, it is necessary to develop a multi-stage servo hydraulic electric cylinder, which uses the electric cylinder as a power source to drive the movement of the piston in the liquid storage cylinder, so that the pressurized fluid enters the multi-stage drive cylinder, thereby driving the multi-stage push rod to extend and retract step by step, saving hydraulic stations, electro-hydraulic valve components, liquid pipes, pumps and other parts, simplifying the structure, reducing the volume of the cylinder body, low manufacturing and maintenance costs, precise control, reliable use, simple and convenient installation, and suitable for high-precision multi-stage drive conditions. Utility Model Content

[0005] In order to solve the above problems, the technical solutions adopted by the utility model are as follows:

[0006] A multi-stage servo hydraulic electric cylinder, comprising a power unit and a drive unit, characterized in that the power unit comprises an electric cylinder and a liquid storage cylinder arranged on the same axis, a piston is arranged in the liquid storage cylinder, the piston divides the liquid storage cylinder into a cavity and a liquid cavity, the electric cylinder is connected to one end of the liquid cavity of the liquid storage cylinder, and the drive end of the electric cylinder extends into the cavity and is connected to the piston;

[0007] The driving unit includes a driving cylinder that is not coaxial with the electric cylinder, wherein a driving chamber is arranged in the driving cylinder, one end of the driving chamber is connected to the liquid chamber, and a multi-stage push rod is arranged at the other end. After the pressurized liquid in the liquid chamber enters the driving chamber, the multi-stage push rod is pushed to extend and retract step by step.

[0008] Preferably, it further comprises a connecting seat, wherein one end of the liquid storage cylinder away from the electric cylinder is connected to the connecting seat, and one end of the driving cylinder away from the multi-stage push rod is connected to the connecting seat.

[0009] Preferably, the liquid cavity is connected with the driving cavity through a pipe fitting, a liquid outlet is provided at the connection between the liquid cavity and the pipe fitting, a liquid inlet is provided at the connection between the driving cavity and the pipe fitting, and the pipe fitting is located between the liquid storage cylinder and the driving cylinder and close to the connecting seat.

[0010] Preferably, the position between the two ends of the pipe can be connected to the connecting seat.

[0011] Preferably, guide components connected to the multi-stage push rods are arranged around the outer side of the driving cylinder.

[0012] Preferably, the multi-stage push rod includes a first-stage push rod slidably connected to the driving chamber through a seal, a second-stage push rod is arranged inside the first-stage push rod slidably connected to the first-stage push rod through a seal, and the guide assembly is connected to one end of the first-stage push rod and the second-stage push rod away from the driving cylinder.

[0013] Preferably, the guide assembly includes a sleeve rod, a first-level telescopic rod with a sliding connection is arranged inside the sleeve rod, a second-level telescopic rod with a sliding connection is arranged inside the first-level telescopic rod, one end of the sleeve rod is connected to the connecting seat, and the other end is connected to the end cover of the driving cylinder, one end of the first-level telescopic rod located outside the sleeve rod is connected to the end of the first-level push rod, and one end of the second-level telescopic rod located outside the first-level telescopic rod is connected to the end of the second-level push rod.

[0014] Preferably, the electric cylinder includes a cylinder body, a servo motor, a screw pair and a driving rod, the screw pair is arranged in the cylinder body, one end of the cylinder body is connected to one end of the cavity of the liquid storage cylinder, and the other end is connected to the servo motor, one end of the screw of the screw pair is transmission-connected to the driving end of the servo motor, and the other end is threadedly connected to the nut, the nut of the screw pair only moves axially relative to the cylinder body, the driving rod is located at one end of the cylinder body and connected to the nut, and the other end is connected to the piston.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] The utility model uses an electric cylinder as a power source to drive the movement of the piston in the liquid storage cylinder, so that the liquid in the liquid chamber is pressurized and enters the driving chamber of the driving cylinder, thereby driving the multi-stage push rod to extend and retract step by step. Compared with the hydraulic cylinder in the prior art, it saves parts such as hydraulic stations, electro-hydraulic valve components, liquid pipes, pumps, etc. Compared with the existing electric cylinders, it eliminates the complex multi-stage screw pair drive structure and helps to reduce the size of the driving cylinder. It has a simple structure, low manufacturing and maintenance costs, precise control, reliable use, simple and convenient installation, and is suitable for high-precision multi-stage drive conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0018] Figure 2 for Figure 1 A partial enlarged schematic diagram in the middle;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0020] Figure 4 for Figure 3 A partial enlarged schematic diagram of point B in the middle;

[0021] Figure 5 for Figure 3 A partial enlarged schematic diagram of point C in the middle;

[0022] Among them: electric cylinder 1, liquid storage cylinder 2, piston 3, drive cylinder 4, multi-stage push rod 5, connecting seat 6, pipe fitting 7, guide assembly 8, cylinder body 11, servo motor 12, screw pair 13, drive rod 14, cavity 21, liquid cavity 22, first-level push rod 51, second-level push rod 52, drive cavity 41, sleeve rod 81, first-level telescopic rod 82, second-level telescopic rod 83, liquid outlet 100, liquid inlet 200. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the accompanying drawings. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear" and similar expressions used herein are for illustrative purposes only.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0026] Below, in conjunction with the accompanying drawings and specific implementation methods, the utility model is further described:

[0027] like Figure 1-5As shown, a multi-stage servo hydraulic electric cylinder 1 includes a power unit and a drive unit. The power unit includes an electric cylinder 1 and a liquid storage cylinder 2 arranged on the same axis. A piston 3 is arranged in the liquid storage cylinder 2. The piston 3 divides the liquid storage cylinder 2 into a cavity 21 and a liquid cavity 22. The electric cylinder 1 is connected to one end of the liquid cavity 22 of the liquid storage cylinder 2. The drive end of the electric cylinder 1 extends into the cavity 21 and is connected to the piston 3.

[0028] The driving unit includes a driving cylinder 4 which is not coaxial with the electric cylinder 1, wherein a driving chamber 41 is provided in the driving cylinder 4, wherein one end of the driving chamber 41 is connected to the liquid chamber 22, and the other end is provided with a multi-stage push rod 5, and after the pressurized liquid in the liquid chamber 22 enters the driving chamber 41, the multi-stage push rod 5 is pushed to extend and retract step by step.

[0029] In this embodiment, the electric cylinder 1 is used as a power source to drive the piston 3 in the liquid storage cylinder 2 to move, so that the liquid in the liquid chamber 22 is pressurized and enters the driving chamber 41 of the driving cylinder 4, thereby driving the multi-stage push rod 5 to extend and retract step by step. Compared with the hydraulic cylinder in the prior art, it saves parts such as hydraulic stations, electro-hydraulic valve components, liquid pipes, pumps, etc. Compared with the existing electric cylinder 1, it eliminates the complex multi-stage lead screw pair 13 driving structure, and helps to reduce the volume of the driving cylinder 4; thus, the multi-stage servo hydraulic electric cylinder 1 has a simple structure, low manufacturing and maintenance costs, precise control, reliable use, simple and convenient installation, and is suitable for high-precision multi-stage drive conditions.

[0030] Further, such as Figure 1 , 3 As shown, in order to improve the connection stability between the drive unit and the power unit and provide a connection position for external installation, a connecting seat 6 is also included, and the end of the liquid storage cylinder 2 away from the electric cylinder 1 is connected to the connecting seat 6, and the end of the drive cylinder 4 away from the multi-stage push rod 5 is connected to the connecting seat 6.

[0031] Further, such as Figure 1 , 3 As shown in Figure 5, in order to achieve the connection between the oil chamber and the driving chamber 41, the liquid chamber 22 is connected with the driving chamber 41 through the pipe fitting 7, a liquid outlet 100 is provided at the connection between the liquid chamber 22 and the pipe fitting 7, and a liquid inlet 200 is provided at the connection between the driving chamber 41 and the pipe fitting 7. The pipe fitting 7 is located between the liquid storage cylinder 2 and the driving cylinder 4, and is close to the connecting seat 6.

[0032] Furthermore, in order to prevent the pipe fitting 7 from moving or loosening due to changes in hydraulic pressure and to improve the connection firmness between the pipe fitting 7 and the hydraulic electric cylinder 1 , the position between the two ends of the pipe fitting 7 can be connected to the connecting seat 6 .

[0033] Further, such as Figure 1 , 2As shown in FIGS. 3 and 4 , in order to improve the stability of the multi-stage push rod 5 when it is subjected to radial force and its coaxiality with the driving cylinder 4 , a guide assembly 8 connected to the multi-stage push rod 5 is arranged around the outer side of the driving cylinder 4 .

[0034] Further, such as Figure 1 , 2 As shown in Figures 3 and 4, in order to achieve the connection between the multi-stage push rod 5 and the guide assembly 8, the multi-stage push rod 5 includes a first-stage push rod 51 which is slidably connected to the driving chamber 41 via a seal, and a second-stage push rod 52 which is slidably connected to the first-stage push rod 51 via a seal is arranged in the first-stage push rod 51, and the guide assembly 8 is connected to one end of the first-stage push rod 51 and the second-stage push rod 52 which is away from the driving cylinder 4.

[0035] Further, such as Figure 1 , 2 As shown in Figures 3 and 4, in order to realize the connection between the guide assembly 8 and each push rod so as to realize the step-by-step guiding effect during driving, the guide assembly 8 includes a sleeve rod 81, a first-level telescopic rod 82 with a sliding connection is arranged inside the sleeve rod 81, a second-level telescopic rod 83 with a sliding connection is arranged inside the first-level telescopic rod 82, one end of the sleeve rod 81 is connected to the connecting seat 6, and the other end is connected to the end cover of the driving cylinder 4, the first-level telescopic rod 82 is located at the outer end of the sleeve rod 81. The end of the first-level telescopic rod 82 is connected to the end of the first-level push rod 51, and the end of the second-level telescopic rod 83 is located at the outer end of the first-level telescopic rod 82. It is connected to the end of the second-level push rod 52.

[0036] Further, such as Figure 3 As shown, in order to realize the connection between the electric cylinder 1 and the liquid storage cylinder 2 and drive the piston 3, the electric cylinder 1 includes a cylinder body 11, a servo motor 12, a screw pair 13 and a driving rod 14. The screw pair 13 is arranged in the cylinder body 11, one end of the cylinder body 11 is connected to one end of the cavity 21 of the liquid storage cylinder 2, and the other end is connected to the servo motor 12. One end of the screw of the screw pair 13 is transmission-connected to the driving end of the servo motor 12, and the other end is threadedly connected to the nut. The nut of the screw pair 13 only moves axially relative to the cylinder body 11. The driving rod 14 is located at one end of the cylinder body 11 and is connected to the nut, and the other end is connected to the piston 3.

[0037] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the utility model patent.

Claims

1. A multi-stage servo hydraulic electric cylinder, comprising a power unit and a drive unit, characterized in that: The power unit comprises an electric cylinder and a liquid storage cylinder arranged on the same axis, a piston is arranged in the liquid storage cylinder, the piston divides the liquid storage cylinder into a cavity and a liquid cavity, the electric cylinder is connected to one end of the liquid cavity of the liquid storage cylinder, and the driving end of the electric cylinder extends into the cavity and is connected to the piston; The driving unit includes a driving cylinder that is not coaxial with the electric cylinder, wherein a driving chamber is arranged in the driving cylinder, one end of the driving chamber is connected to the liquid chamber, and a multi-stage push rod is arranged at the other end. After the pressurized liquid in the liquid chamber enters the driving chamber, the multi-stage push rod is pushed to extend and retract step by step.

2. The multi-stage servo hydraulic electric cylinder according to claim 1, characterized in that: It also includes a connecting seat, one end of the liquid storage cylinder away from the electric cylinder is connected to the connecting seat, and one end of the driving cylinder away from the multi-stage push rod is connected to the connecting seat.

3. The multi-stage servo hydraulic electric cylinder according to claim 1, characterized in that: The liquid cavity is connected with the driving cavity through a pipe fitting, a liquid outlet is arranged at the connection between the liquid cavity and the pipe fitting, a liquid inlet is arranged at the connection between the driving cavity and the pipe fitting, and the pipe fitting is located between the liquid storage cylinder and the driving cylinder and close to the connecting seat.

4. The multi-stage servo hydraulic electric cylinder according to claim 3, characterized in that: The position between the two ends of the pipe can be connected to the connecting seat.

5. The multi-stage servo hydraulic electric cylinder according to claim 2, characterized in that: The outer sides of the driving cylinder are surrounded by guide components connected with the multi-stage push rods.

6. The multi-stage servo hydraulic electric cylinder according to claim 5, characterized in that: The multi-stage push rod includes a first-stage push rod slidably connected to the driving chamber through a seal, a second-stage push rod slidably connected to the first-stage push rod through a seal is arranged inside the first-stage push rod, and the guide assembly is connected to one end of the first-stage push rod and the second-stage push rod away from the driving cylinder.

7. The multi-stage servo hydraulic electric cylinder according to claim 6, characterized in that: The guide assembly includes a sleeve rod, a first-level telescopic rod with a sliding connection is arranged inside the sleeve rod, a second-level telescopic rod with a sliding connection is arranged inside the first-level telescopic rod, one end of the sleeve rod is connected to a connecting seat, and the other end is connected to an end cover of a driving cylinder, one end of the first-level telescopic rod located outside the sleeve rod is connected to an end of a first-level push rod, and one end of the second-level telescopic rod located outside the first-level telescopic rod is connected to an end of a second-level push rod.

8. The multi-stage servo hydraulic electric cylinder according to claim 1, characterized in that: The electric cylinder includes a cylinder body, a servo motor, a screw pair and a driving rod. The screw pair is arranged in the cylinder body. One end of the cylinder body is connected to one end of the cavity of the liquid storage cylinder, and the other end is connected to the servo motor. One end of the screw of the screw pair is transmission-connected to the driving end of the servo motor, and the other end is threadedly connected to the nut. The nut of the screw pair only moves axially relative to the cylinder body. The driving rod is located at one end of the cylinder body and is connected to the nut, and the other end is connected to the piston.

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