Multi-stage hydraulic cylinder mechanical feedback device

Abstract

The utility model provides a multi-stage hydraulic cylinder mechanical feedback device which comprises a first-stage piston, a second-stage piston, a multi-stage cylinder barrel, a first-stage feedback nut, a first-stage feedback lead screw, a first-stage flow passing plate, a second-stage feedback nut, a second-stage feedback lead screw, a second-stage flow passing plate, a multi-stage cylinder bottom and a feedback adapter, and the first-stage feedback lead screw is meshed with the first-stage feedback nut; the adapter is rigidly mounted on the primary feedback screw rod; the first-stage overflowing plate is fixed to the second-stage piston and limits the axial relative movement of the first-stage feedback lead screw and the second-stage piston; the secondary feedback nut is rigidly mounted on the feedback adapter; the second-stage feedback screw rod is meshed with the second-stage feedback nut and is mounted on the multi-stage cylinder barrel through the second-stage overflowing plate, so that the axial relative movement of the second-stage feedback screw rod and the multi-stage cylinder barrel is limited; the lead of the first-stage feedback lead screw is equal to that of the second-stage feedback lead screw. According to the device, accurate control over the hydraulic cylinder is achieved through mechanical feedback, dependence of an external sensor is reduced, installation and debugging are easy and convenient, and maintainability is high.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system technology, and in particular to a multi-stage hydraulic cylinder mechanical feedback device. Background Technology

[0002] Multistage hydraulic cylinders, also known as telescopic hydraulic cylinders, consist of two or more stages of piston cylinders assembled together. Through their multistage design, multistage hydraulic cylinders can achieve a greater range of motion within a smaller space; the shorter extension of each stage increases stability; and the multistage design distributes pressure during operation, reducing wear on individual components and thus extending the service life of the hydraulic cylinder. Because multistage hydraulic cylinders can have a long stroke during operation and a shorter retraction when not in use, they are suitable for applications where installation space is limited but a long stroke is required, such as the telescopic booms of dump trucks and cranes.

[0003] With technological advancements, higher demands are being placed on the precision of hydraulic control. To achieve precise control of multi-stage hydraulic cylinders, complex hydraulic servo technology is often employed, utilizing external sensors to detect the speed and position of the cylinders and expensive proportional or servo valves for control. However, external sensors are highly susceptible to environmental influences, and proportional servo systems are complex and difficult to debug. Chinese patent application number 200410069392.3 discloses a two-stage spiral internal feedback digital fluid cylinder that uses a mechanical closed-loop method to achieve both position and speed control. While the concept is ingenious, its mechanical closed-loop method cannot be easily applied to the control of multi-stage hydraulic cylinders. Utility Model Content

[0004] This invention provides a multi-stage hydraulic cylinder mechanical feedback device to address the deficiencies in the prior art.

[0005] This utility model provides a multi-stage hydraulic cylinder mechanical feedback device, including: a primary piston, a secondary piston, a multi-stage cylinder barrel, a primary feedback nut, a primary feedback screw, a primary flow plate, a secondary feedback nut, a secondary feedback screw, a secondary flow plate, a multi-stage cylinder bottom, and a feedback adapter.

[0006] The primary feedback nut is rigidly mounted on the primary piston;

[0007] The primary feedback lead screw engages with the primary feedback nut;

[0008] The feedback adapter is rigidly mounted on the primary feedback lead screw;

[0009] The primary flow plate is fixed to the secondary piston, restricting the axial relative movement between the primary feedback screw and the secondary piston;

[0010] The secondary feedback nut is rigidly mounted on the feedback adapter;

[0011] The secondary feedback screw meshes with the secondary feedback nut and is installed on the multi-stage cylinder via the secondary flow plate, thereby restricting the axial relative movement between the secondary feedback screw and the multi-stage cylinder.

[0012] The lead of the primary feedback lead screw is equal to that of the secondary feedback lead screw;

[0013] The feedback signal of the mechanical feedback device is output through the shaft end of the secondary feedback screw, providing precise mechanical feedback only on the relative position and speed of the first-stage piston and the multi-stage cylinder.

[0014] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, wherein the feedback adapter is a rigid connector, which is installed on the first-stage feedback screw and is used to transmit the rotational motion of the first-stage feedback screw to the second-stage feedback nut.

[0015] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, wherein the first-stage flow plate and the second-stage flow plate are respectively fixed to the second-stage piston and the multi-stage cylinder by an axial limiting structure to limit the axial displacement of the corresponding lead screw.

[0016] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, wherein the end of the multi-stage cylinder barrel is provided with a multi-stage cylinder bottom, which is used to close the hydraulic cylinder as the output port of mechanical feedback.

[0017] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, wherein the extension and retraction movements of the first-stage piston, the second-stage piston, and the multi-stage cylinder are driven by hydraulic pressure, and the mechanical feedback device operates independently of the hydraulic system.

[0018] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, which is suitable for scenarios where installation space is limited and long stroke control is required, including dump trucks and crane telescopic booms.

[0019] According to the present invention, a multi-stage hydraulic cylinder mechanical feedback device is provided, the structure of which can be extended to three or more stages of multi-stage hydraulic cylinders, with the lead of the feedback screw in each stage remaining consistent.

[0020] This invention provides a multi-stage hydraulic cylinder mechanical feedback device that achieves precise control of the hydraulic cylinder through mechanical feedback, reducing reliance on external sensors and lowering system costs. The mechanical feedback method avoids complex proportional valve and servo valve systems, simplifying installation, debugging, and maintenance. This device is suitable for applications with limited installation space and requiring long-stroke control, such as dump trucks and crane telescopic booms. The structural design can be expanded to three or more stages of hydraulic cylinders, with consistent lead of the feedback screws at each stage. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of a multi-stage hydraulic cylinder mechanical feedback device provided in an embodiment of this utility model. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0025] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0027] See appendix Figure 1As shown, this utility model provides a multi-stage hydraulic cylinder mechanical feedback device, including: a primary piston 1, a secondary piston 2, a multi-stage cylinder barrel 3, a primary feedback nut 4, a primary feedback screw 5, a primary flow plate 6, a secondary feedback nut 7, a secondary feedback screw 8, a secondary flow plate 9, a multi-stage cylinder bottom 10, and a feedback adapter 11.

[0028] The first-stage feedback nut 4 is rigidly mounted on the first-stage piston 1;

[0029] The first-stage feedback lead screw 5 engages with the first-stage feedback nut 4;

[0030] Feedback adapter 11 is rigidly mounted on the first-stage feedback lead screw 5;

[0031] The primary flow plate 6 is fixed to the secondary piston 2, restricting the axial relative movement between the primary feedback screw 5 and the secondary piston 2;

[0032] The secondary feedback nut 7 is rigidly mounted on the feedback adapter 11;

[0033] The secondary feedback screw 8 meshes with the secondary feedback nut 7 and is installed on the multi-stage cylinder 3 through the secondary flow plate 9, which restricts the axial relative movement between the secondary feedback screw 8 and the multi-stage cylinder 3.

[0034] The lead of the first-stage feedback screw 5 is equal to that of the second-stage feedback screw 8;

[0035] The feedback signal of the mechanical feedback device is output through the shaft end of the secondary feedback screw 8, providing precise mechanical feedback only on the relative position and speed of the first-stage piston 1 and the multi-stage cylinder 3.

[0036] Feedback adapter 11 is a rigid connector, installed on the primary feedback screw 5, and is used to transmit the rotational motion of the primary feedback screw 5 to the secondary feedback nut 7.

[0037] The primary flow plate 6 and the secondary flow plate 9 are fixed to the secondary piston 2 and the multi-stage cylinder 3 respectively by an axial limiting structure to limit the axial displacement of the corresponding lead screw.

[0038] The multi-stage cylinder barrel 3 has a multi-stage cylinder bottom 10 at its end, which is used to seal the hydraulic cylinder as the output port for mechanical feedback.

[0039] The extension and retraction movements of the primary piston 1, the secondary piston 2, and the multi-stage cylinder 3 are driven by hydraulic pressure, and the mechanical feedback device operates independently of the hydraulic system.

[0040] The device is suitable for scenarios where installation space is limited and long stroke control is required, including dump trucks and crane telescopic booms.

[0041] The structure of the mechanical feedback device can be extended to three or more stages of hydraulic cylinders, with the lead of the feedback screws at each stage remaining consistent.

[0042] Working principle: When there is no relative movement between the secondary piston 2 and the multi-stage cylinder 3, and only axial movement occurs between the primary piston 1 and the secondary piston 2, the primary flow plate 6 restricts the axial relative movement between the primary feedback screw 5 and the secondary piston 2. The primary feedback nut 4 drives the primary feedback screw 5 to rotate, which in turn drives the secondary feedback nut 7 and the secondary feedback screw 8 to rotate together via the feedback adapter 11. The mechanical feedback signal of the multi-stage hydraulic cylinder is output through the shaft end of the secondary feedback screw 8.

[0043] When there is no relative movement between the first-stage piston 1 and the second-stage piston 2, and when there is axial movement between the second-stage piston 2 and the multi-stage cylinder 3, the second-stage feedback nut 7 drives the second-stage feedback screw 8 to rotate, and the mechanical feedback signal is output through the shaft end of the second-stage feedback screw 8.

[0044] In the control process of a multi-stage hydraulic cylinder, mechanical feedback is used to precisely provide feedback only on the relative position and velocity between the first-stage piston 1 and the multi-stage cylinder 3 at their initial and final positions. This design is simple and efficient, avoiding reliance on complex hydraulic servo systems while improving system stability and maintainability.

[0045] This invention provides a multi-stage hydraulic cylinder mechanical feedback device that achieves precise control of the hydraulic cylinder through mechanical feedback, reducing reliance on external sensors and lowering system costs. The mechanical feedback method avoids complex proportional valve and servo valve systems, simplifying installation, debugging, and maintenance. This device is suitable for applications with limited installation space and requiring long-stroke control, such as dump trucks and crane telescopic booms. The structural design can be expanded to three or more stages of hydraulic cylinders, with consistent lead of the feedback screws at each stage.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A multi-stage hydraulic cylinder mechanical feedback device, characterized by, include: First-stage piston (1), second-stage piston (2), multi-stage cylinder (3), first-stage feedback nut (4), first-stage feedback screw (5), first-stage flow plate (6), second-stage feedback nut (7), second-stage feedback screw (8), second-stage flow plate (9), multi-stage cylinder bottom (10), feedback adapter (11); The primary feedback nut (4) is rigidly mounted on the primary piston (1); The primary feedback lead screw (5) engages with the primary feedback nut (4); The feedback adapter (11) is rigidly mounted on the primary feedback lead screw (5); The primary flow plate (6) is fixed to the secondary piston (2), restricting the axial relative movement of the primary feedback screw (5) and the secondary piston (2); The secondary feedback nut (7) is rigidly installed on the feedback adapter (11); The secondary feedback screw (8) meshes with the secondary feedback nut (7) and is installed on the multi-stage cylinder (3) through the secondary flow plate (9), which restricts the axial relative movement of the secondary feedback screw (8) and the multi-stage cylinder (3); The lead of the first-stage feedback screw (5) is equal to that of the second-stage feedback screw (8); The feedback signal of the mechanical feedback device is output through the shaft end of the secondary feedback screw (8), and provides precise mechanical feedback only on the relative position and speed of the first-stage piston (1) and the multi-stage cylinder (3) at the beginning and end.

2. A multi-stage hydraulic cylinder mechanical feedback device according to claim 1, characterized in that: The feedback adapter (11) is a rigid connector, which is installed on the first-stage feedback screw (5) and is used to transmit the rotational motion of the first-stage feedback screw (5) to the second-stage feedback nut (7).

3. A multi-stage hydraulic cylinder mechanical feedback device according to claim 2, characterized in that: The primary flow plate (6) and the secondary flow plate (9) are fixed to the secondary piston (2) and the multi-stage cylinder (3) respectively by an axial limiting structure to limit the axial displacement of the corresponding lead screw.

4. A multi-stage hydraulic cylinder mechanical feedback device according to claim 3, characterized in that: The multi-stage cylinder barrel (3) is provided with a multi-stage cylinder bottom (10) at the end, which is used to seal the hydraulic cylinder and serve as the output port for mechanical feedback.

5. A multi-stage hydraulic cylinder mechanical feedback device according to claim 4, characterized in that: The extension and retraction movements of the primary piston (1), secondary piston (2) and multi-stage cylinder (3) are driven by hydraulic pressure, and the mechanical feedback device operates independently of the hydraulic system.

6. A multi-stage hydraulic cylinder mechanical feedback device according to claim 5, characterized in that: The device is suitable for scenarios where installation space is limited and long-stroke control is required, including dump trucks and crane telescopic booms.

7. A multi-stage hydraulic cylinder mechanical feedback device according to claim 6, characterized in that: The structure of the mechanical feedback device can be extended to three or more stages of hydraulic cylinders, with the lead of the feedback screws at each stage remaining consistent.

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