Heavy-load multistage digital hydraulic cylinder for heavy machinery

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a heavy-load multi-stage digital hydraulic cylinder for heavy machinery, which comprises a multi-stage digital hydraulic cylinder main body, a positioning cylinder body is arranged on the multi-stage digital hydraulic cylinder main body, a first-stage piston rod is mounted in the positioning cylinder body, a second-stage piston rod is mounted in the first-stage piston rod, and a third-stage piston rod is mounted in the second-stage piston rod. And a positioning stabilizing seat is fixedly arranged outside the positioning cylinder body in a sleeving mode, limiting seats are evenly arranged on the side face of the positioning stabilizing seat at intervals, inserting and connecting limiting holes are formed in the limiting seats correspondingly, and a first reinforcing plate, a second reinforcing plate and a third reinforcing plate are fixed to the outer ring above the second-stage piston rod, the outer ring above the first-stage piston rod and the outer ring above the positioning cylinder body correspondingly. According to the heavy-load multi-stage digital hydraulic cylinder for the heavy machinery, each stage of piston part is subjected to structure enhancement treatment, the dustproof effect is enhanced, the heavy-load capacity of the hydraulic cylinder is improved, meanwhile, each stage of piston is provided with a reliable limiting structure, and safe and reliable operation can be achieved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery. Background Technology

[0002] Heavy machinery refers to mechanical equipment designed to perform heavy-duty operations, operate large objects, or work under extreme conditions. Precise position control via digital hydraulic cylinders can improve energy efficiency, increase automation, enhance operator safety and comfort, and reduce environmental impact. Digital hydraulic cylinders integrate digital control technology, combining the powerful output of traditional hydraulic technology with the high precision, flexibility, and intelligent management capabilities of modern digital control systems. They enable precise position, speed, and force control. Multistage hydraulic cylinders typically consist of multiple nested piston rods, each acting as an independent hydraulic cylinder. When hydraulic fluid enters the first chamber, the outermost piston rod extends first; once the first stage is fully extended, the fluid continues to push the next stage piston rod forward, and so on, until all stages are fully extended, achieving a long stroke within a relatively small installation space.

[0003] Existing heavy machinery uses multi-stage digital hydraulic cylinders that operate under heavy loads. Traditional multi-stage telescopic cylinders gradually decrease in size with each stage of extension, resulting in insufficient support strength, affecting heavy load capacity, and compromising safety. Utility Model Content

[0004] The purpose of this utility model is to provide a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery, in order to solve the problem mentioned in the background art that the current multi-stage digital hydraulic cylinders for heavy machinery on the market are subjected to heavy loads during operation. Traditional multi-stage telescopic cylinders will gradually decrease in size as they extend, resulting in insufficient support strength, affecting the heavy load capacity, and at the same time, the safety cannot be guaranteed.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery, comprising a multi-stage digital hydraulic cylinder body, a positioning cylinder body on the multi-stage digital hydraulic cylinder body, a first-stage piston rod installed inside the positioning cylinder body, and a second-stage piston rod installed inside the first-stage piston rod. A positioning and stabilizing seat is sleeved and fixed outside the positioning cylinder body, and limiting seats are evenly spaced on the side of the positioning and stabilizing seat, and insertion limiting holes are respectively opened in the limiting seats. A first reinforcing plate, a second reinforcing plate, and a third reinforcing plate are respectively fixed on the upper outer ring of the second-stage piston rod, the first-stage piston rod, and the positioning cylinder body, and the outer ring dimensions of the first reinforcing plate, the second reinforcing plate, and the third reinforcing plate are the same. A first dust cover and a second dust cover with the same shape and structure are respectively provided between the first reinforcing plate and the second reinforcing plate and between the second reinforcing plate and the third reinforcing plate. A first limiting and stabilizing rod and a second limiting and stabilizing rod are also fixed at the bottom of the first reinforcing plate and the second reinforcing plate, and the first limiting and stabilizing rod and the second limiting and stabilizing rod are respectively located outside the first dust cover and the second dust cover.

[0006] Preferably, the upper end of the first reinforcing plate is fixed with an upper connecting seat with a through hole by welding, and the bottom surface of the first reinforcing plate is provided with a first limiting groove corresponding to the position of the first dust cover.

[0007] Preferably, the second reinforcing plate has a second limiting groove on its upper and lower surfaces, corresponding to the positions of the first dust cover and the second dust cover, and the second reinforcing plate also has a first through limiting hole that cooperates with the first limiting stabilizing rod.

[0008] Preferably, the upper end of the third reinforcing plate is provided with a third limiting groove corresponding to the position of the second dust cover, and the third reinforcing plate is also provided with a second through limiting hole, and the position of the second through limiting hole corresponds to that of the first through limiting hole.

[0009] Preferably, the positioning cylinder body is provided with an oil injection port on its side, and the oil injection port is in a through-fitting relationship with the positioning and stabilizing seat, and the oil injection port is located between adjacent limiting seats.

[0010] Preferably, the bottom of the positioning and stabilizing seat is fixed with a base plate by welding, and a lower connecting seat is welded to the bottom of the base plate, which is symmetrically arranged with the upper connecting seat.

[0011] Preferably, the limiting seats are arranged in a cross shape, and the limiting seats are movably connected to the first limiting stabilizing rod and the second limiting stabilizing rod, respectively, and the first limiting stabilizing rod and the second limiting stabilizing rod are staggered at intervals.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: The heavy-duty multi-stage digital hydraulic cylinder for heavy machinery features structural reinforcement treatment on each piston stage, enhanced dustproofing, and improved heavy-duty capacity. Simultaneously, each piston stage has a reliable limiting structure, ensuring safe and reliable operation. This heavy-duty multi-stage digital hydraulic cylinder for heavy machinery uses a positioning and stabilizing seat to structurally reinforce the positioning cylinder body. Reinforcing plates are respectively installed on the second-stage piston rod, the first-stage piston rod, and the upper side of the positioning cylinder body to stabilize the limiting structure, thereby increasing structural strength. The limiting and stabilizing rod is located outside the dust cover, providing both movement limitation and stabilization while also protecting the dust cover. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the relative position of the dust cover to the piston rod of a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to this utility model.

[0014] Figure 2 This is a side view of a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to this utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to this utility model;

[0016] Figure 4 This is a schematic diagram of the retraction structure of a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to this utility model;

[0017] Figure 5 This is a schematic diagram of the positioning and stabilizing seat structure of a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to this utility model.

[0018] In the diagram: 1. Multi-stage digital hydraulic cylinder body; 2. First reinforcing plate; 201. First dust cover; 202. Upper connecting seat; 203. First limiting groove; 204. First limiting stabilizing rod; 3. Secondary piston rod; 4. Second reinforcing plate; 401. Second limiting stabilizing rod; 402. Second limiting groove; 403. Second dust cover; 404. First through limiting hole; 5. Primary piston rod; 6. Third reinforcing plate; 601. Third limiting groove; 602. Second through limiting hole; 7. Positioning cylinder body; 8. Positioning stabilizing seat; 801. Base plate; 802. Limiting seat; 803. Lower connecting seat; 804. Insertion limiting hole; 9. Oil filling port. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-5This utility model provides a technical solution: a heavy-duty multi-stage digital hydraulic cylinder for heavy machinery, comprising a multi-stage digital hydraulic cylinder body 1, a positioning cylinder 7 on the multi-stage digital hydraulic cylinder body 1, a first-stage piston rod 5 installed inside the positioning cylinder 7, and a second-stage piston rod 3 installed inside the first-stage piston rod 5. A positioning and stabilizing seat 8 is sleeved and fixed outside the positioning cylinder 7, and limiting seats 802 are evenly spaced on the side of the positioning and stabilizing seat 8. An oil injection port 9 is installed on the side of the positioning cylinder 7, and the oil injection port 9 is through-fitted with the positioning and stabilizing seat 8, and the oil injection port 9 is located between adjacent limiting seats 802. This structure, the positioning cylinder 7, the first-stage piston rod 5, and the second-stage piston rod 3 constitute a multi-stage hydraulic cylinder structure, integrating existing displacement sensors and pressure sensors. Sensors monitor the position, speed, and applied force of the hydraulic cylinder in real time. A controller executes complex algorithms to adjust the working state of the hydraulic system, thereby achieving precise control. The oil filling port 9 is used for oil connection. The limit seat 802 also provides safety protection for the oil filling port 9. The limit seat 802 is provided with insertion limit holes 804. The upper outer ring of the secondary piston rod 3, the primary piston rod 5, and the positioning cylinder body 7 are respectively fixed with a first reinforcing plate 2, a second reinforcing plate 4, and a third reinforcing plate 6. The first reinforcing plate 2, the second reinforcing plate 4, and the third reinforcing plate 6 respectively reinforce the upper structure of the secondary piston rod 3, the primary piston rod 5, and the positioning cylinder body 7. At the same time, the first reinforcing plate 2 and the second reinforcing plate 4 are connected. The first limiting and stabilizing rod 204 provides relative stability and limits the movement of the secondary piston rod 3. The second and third reinforcing plates 4 and 6 are relatively stable together via the second limiting and stabilizing rod 401, which also limits the movement of the primary piston rod 5. This ensures the multi-stage digital hydraulic cylinder body 1 has a stronger heavy-duty capacity. The outer ring dimensions of the first, second, and third reinforcing plates 2 and 4 are identical. A base plate 801 is welded to the bottom of the positioning and stabilizing seat 8, and a lower connecting seat 803, symmetrically arranged with the upper connecting seat 202, is welded to the bottom of the base plate 801. This structure makes the positioning and stabilizing seat 8, base plate 801, limiting seat 802, and lower connecting seat 803 form a stable integrated structure. The positioning cylinder 7 has a reliable positioning structure via the positioning stabilizing seat 8. A first dust cover 201 and a second dust cover 403 with identical shapes and structures are respectively provided between the first reinforcing plate 2 and the second reinforcing plate 4, and between the second reinforcing plate 4 and the third reinforcing plate 6. An upper connecting seat 202 with through holes is welded to the upper end of the first reinforcing plate 2, and a first limiting groove 203 corresponding to the position of the first dust cover 201 is formed on the bottom surface of the first reinforcing plate 2. This structure allows the multi-stage digital hydraulic cylinder body 1 to be connected and fixed at its upper end via the upper connecting seat 202, and the first dust cover 201 to be installed and positioned via the first limiting groove 203. Furthermore, the first dust cover 201 and the second dust cover 403 are retractable and foldable structures.To ensure the first dust cover 201 can be concealed within the first limiting groove 203, the second reinforcing plate 4 has a ring of second limiting grooves 402 on its upper and lower surfaces, corresponding to the positions of the first dust cover 201 and the second dust cover 403. The second reinforcing plate 4 also has a first through-hole 404 that engages with the first limiting and stabilizing rod 204. This structure allows the second dust cover 403 to be concealed within the second limiting grooves 402. The installation of the first dust cover 201 and the second dust cover 403 effectively improves the dustproof effect on the moving parts of the secondary piston rod 3 and the primary piston rod 5. The upper end of the third reinforcing plate 6 has a ring of third limiting grooves 601 corresponding to the position of the second dust cover 403. The third reinforcing plate 6 also has a second through-hole 602, which corresponds to the position of the first through-hole 404. This structure allows the first limiting and stabilizing rod 204 to engage with the second through-hole 602 and the first through-hole 404 respectively. The multi-stage digital hydraulic cylinder body 1 is retracted to its shortest length, allowing the first limiting and stabilizing rod 204 to remain unobstructed. The bottoms of the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 are designed with pointed tips, allowing for smooth movable insertion. The bottoms of the first reinforcing plate 2 and the second reinforcing plate 4 are also fixed with the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401, respectively. The limiting seats 802 are arranged in a cross shape, and the limiting seats 802 are movably inserted into the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401, respectively. The first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 are staggered at intervals. With this structure, when the multi-stage digital hydraulic cylinder body 1 is retracted to its shortest length, the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 can be inserted into the corresponding insertion limiting holes 804, and the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 are located outside the first dust cover 201 and the second dust cover 403, respectively. ,

[0021] Working Principle: When using this heavy-duty multi-stage digital hydraulic cylinder for heavy machinery, the main body 1 of the multi-stage digital hydraulic cylinder is first positioned and stabilized by the positioning and stabilizing seat 8. The upper connecting seat 202 and the lower connecting seat 803 are used for the installation and fixing of both ends of the main body 1 of the multi-stage digital hydraulic cylinder. The first reinforcing plate 2 and the base plate 801 are used for the stabilization of the upper connecting seat 202 and the lower connecting seat 803, respectively. When the main body 1 of the multi-stage digital hydraulic cylinder is working, hydraulic oil enters the positioning cylinder 7 through the oil injection port 9 to perform piston movement on the first-stage piston rod 5. During this process, the second reinforcing plate 4 gradually moves away from the third reinforcing plate 6, and the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 are gradually pulled out from the insertion limiting hole 804. The limiting seat 802 plays a positioning role for the first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401. At the same time, the second through limiting hole 602 is also used for positioning. The first limiting and stabilizing rod 204 and the second limiting and stabilizing rod 401 are used to stabilize the first-stage piston rod 5. At the same time, the second dust cover 403 gradually unfolds to enhance the dustproof effect of the first-stage piston rod 5. Then, hydraulic oil enters the first-stage piston rod 5, causing the second-stage piston rod 3 to perform piston movement. During this process, the first reinforcing plate 2 moves away from the second reinforcing plate 4. The first limiting and stabilizing rod 204 moves under the limitation of the first through-hole 404 to stabilize the second-stage piston rod 3. The first dust cover 201 also gradually unfolds. The first dust cover 201 is positioned by the cooperation of the first limiting groove 203 and the second limiting groove 402. The second dust cover 403 can be folded and hidden by the cooperation of the second limiting groove 402 and the third limiting groove 601. By strengthening the structure of each piston part, the multi-stage digital hydraulic cylinder body 1 is provided with heavy load capacity, thereby completing a series of tasks.

[0022] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heavy-duty multi-stage digital hydraulic cylinder for heavy machinery, comprising a multi-stage digital hydraulic cylinder body (1), characterized in that: The multi-stage digital hydraulic cylinder body (1) is provided with a positioning cylinder (7), and a first-stage piston rod (5) is installed inside the positioning cylinder (7), and a second-stage piston rod (3) is installed inside the first-stage piston rod (5). A positioning stabilizing seat (8) is sleeved and fixed on the outside of the positioning cylinder (7), and a limiting seat (802) is evenly spaced on the side of the positioning stabilizing seat (8), and an insertion limiting hole (804) is opened in the limiting seat (802). A first reinforcing plate (2), a second reinforcing plate (4) and a third reinforcing plate (6) are fixed on the upper outer ring of the second-stage piston rod (3), the first-stage piston rod (5) and the positioning cylinder (7), respectively. The outer ring dimensions of the first reinforcing plate (2), the second reinforcing plate (4) and the third reinforcing plate (6) are the same. The first reinforcing plate (2) and the second reinforcing plate (4) and the second reinforcing plate (4) and the third reinforcing plate (6) are respectively provided with a first dust cover (201) and a second dust cover (403) with the same shape and structure. The bottom of the first reinforcing plate (2) and the second reinforcing plate (4) are also respectively fixed with a first limiting and stabilizing rod (204) and a second limiting and stabilizing rod (401). The first limiting and stabilizing rod (204) and the second limiting and stabilizing rod (401) are respectively located on the outside of the first dust cover (201) and the second dust cover (403).

2. The heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The upper end of the first reinforcing plate (2) is fixed with an upper connecting seat (202) with a through hole by welding, and a first limiting groove (203) is opened on the bottom surface of the first reinforcing plate (2) corresponding to the position of the first dust cover (201).

3. The heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The second reinforcing plate (4) has a second limiting groove (402) on its upper and lower surfaces, which corresponds to the positions of the first dust cover (201) and the second dust cover (403). The second reinforcing plate (4) also has a first through limiting hole (404) that is in contact with the first limiting stabilizing rod (204).

4. The heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The upper end of the third reinforcing plate (6) is provided with a third limiting groove (601) corresponding to the position of the second dust cover (403), and the third reinforcing plate (6) is also provided with a second through limiting hole (602), and the second through limiting hole (602) corresponds to the position of the first through limiting hole (404).

5. A heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The positioning cylinder (7) is equipped with an oil injection port (9) on its side, and the oil injection port (9) is in contact with the positioning stabilizing seat (8), and the oil injection port (9) is located between adjacent limiting seats (802).

6. A heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The bottom of the positioning and stabilizing seat (8) is fixed with a base plate (801) by welding, and a lower connecting seat (803) is welded to the bottom of the base plate (801) and is symmetrically arranged with the upper connecting seat (202).

7. A heavy-duty multi-stage digital hydraulic cylinder for heavy machinery according to claim 1, characterized in that: The limiting seat (802) is arranged in a cross shape, and the limiting seat (802) is movably inserted into the first limiting stabilizing rod (204) and the second limiting stabilizing rod (401) respectively, and the first limiting stabilizing rod (204) and the second limiting stabilizing rod (401) are staggered at intervals.

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