Multi-stage hydraulic cylinder

Abstract

The utility model relates to the technical field of hydraulic cylinders, and discloses a multi-stage hydraulic cylinder which comprises an oil hydraulic cylinder, a lower limiting ring and an upper limiting ring are arranged in the oil hydraulic cylinder in a connected mode, and a first-stage piston is arranged in the oil hydraulic cylinder and located between the lower limiting ring and the upper limiting ring in a sliding mode. A first sealing ring is arranged on the surface of an outer ring of the first-stage piston in a connected mode, a first-stage pushing cylinder is arranged at the top end of the first-stage piston in a connected mode, and one end of the first-stage pushing cylinder extends out of the oil hydraulic cylinder. The surface of the pushing cylinder is kept clean, and dust and impurities are prevented from entering the equipment to affect normal operation and service life of the equipment; and through the first pressure relief nozzle, the second pressure relief nozzle and the reset spring, the speed of the hydraulic cylinder assembly falling back into the oil hydraulic cylinder is increased, and therefore after the hydraulic cylinder is used, the time for workers to wait for storage is shortened.

Description

Technical Field

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

[0002] A multistage hydraulic cylinder is a hydraulic actuator with multiple working chambers. It consists of two or more pistons that move sequentially within the cylinder body, thereby achieving a longer stroke or greater output force. It is widely used in applications requiring large strokes or high torques, such as large mechanical equipment and construction machinery.

[0003] Over time, oil, dust, and other impurities tend to accumulate on the surface of the push cylinder. These impurities not only affect the appearance of the equipment but can also hinder the normal operation of the push cylinder. For example, they can increase the friction between the piston and the cylinder wall, leading to sluggish operation. Furthermore, after use, the hydraulic cylinder assembly retracts slowly, requiring workers to wait a considerable amount of time for the equipment to be properly stored. This not only reduces work efficiency but can also disrupt the rhythm of the entire production process. Utility Model Content

[0004] The purpose of this invention is to provide a multi-stage hydraulic cylinder to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a hydraulic cylinder, inside which a lower limit ring and an upper limit ring are respectively connected and arranged. A first-stage piston is slidably arranged between the lower and upper limit rings inside the hydraulic cylinder. A first sealing ring is connected to the outer surface of the first-stage piston. A first-stage push cylinder is connected to the top of the first-stage piston. One end of the first-stage push cylinder extends outside the hydraulic cylinder. Oil inlet pipes are connected to both sides of the surface of the hydraulic cylinder, and the other end of the oil inlet pipes extends into the hydraulic cylinder below the lower limit ring. First pressure relief nozzles are connected to both sides of the surface of the hydraulic cylinder, and the other end of the first pressure relief nozzles extends into the hydraulic cylinder above the upper limit ring. Second pressure relief nozzles are connected to the lower half of both sides of the surface of the first-stage push cylinder, and the other end of the second pressure relief nozzles extends into the upper half of the first-stage push cylinder. An oil inlet groove is opened at the top of the first-stage push cylinder, and the other end of the second pressure relief nozzle communicates with the oil inlet groove. Cleaning components are connected to the tops of both the hydraulic cylinder and the first-stage push cylinder.

[0006] Preferably, a second-stage piston is slidably disposed inside the first-stage push cylinder, a second sealing ring is connected to the outer surface of the second-stage piston, a second-stage push cylinder is connected to the top of the second-stage piston, and the second-stage push cylinder extends outside the first-stage push cylinder.

[0007] Preferably, a return spring is connected and installed inside the first-stage push cylinder on the surface of the second-stage push cylinder.

[0008] Preferably, the bottom of the first-stage push cylinder has a through hole, and the through hole communicates with the interior of the first-stage push cylinder.

[0009] Preferably, the cleaning component includes a mounting ring threaded inside a mounting groove, a cleaning housing connected to the top of the mounting ring, a sponge connected inside the cleaning housing, and two dustproof rings connected to the inner surface of the sponge.

[0010] Preferably, the size of the cleaning component at the top of the hydraulic cylinder matches the diameter of the first-stage push cylinder, and the size of the cleaning component at the top of the first-stage push cylinder matches the diameter of the second-stage push cylinder.

[0011] Preferably, the bottom end of the hydraulic cylinder is connected to a base, and the top end of the base is provided with multiple mounting holes.

[0012] Compared with the prior art, the beneficial effects of this utility model are: by cleaning the mounting ring, cleaning shell, sponge and dustproof ring in the cleaning component, it can effectively clean and prevent dust, keep the surface of the push cylinder clean, and prevent dust and impurities from entering the equipment and affecting the normal operation and life of the equipment; by using the first and second pressure relief nozzles and the reset spring, the speed at which the hydraulic cylinder component falls back into the oil cylinder is accelerated, thereby reducing the time that the staff waits to put away the hydraulic cylinder after use. Attached Figure Description

[0013] Figure 1 This is a front view schematic diagram of a multi-stage hydraulic cylinder.

[0014] Figure 2 This is a schematic diagram of the front section structure of a multi-stage hydraulic cylinder;

[0015] Figure 3 This is a front sectional view of a cleaning assembly for a multi-stage hydraulic cylinder.

[0016] In the diagram: 1. Hydraulic cylinder; 2. Lower limit ring; 3. Upper limit ring; 4. First-stage piston; 5. First sealing ring; 6. First-stage push cylinder; 7. Oil inlet pipe; 8. First pressure relief nozzle; 9. Second pressure relief nozzle; 10. Oil inlet groove; 11. Second-stage piston; 12. Second sealing ring; 13. Second-stage push cylinder; 14. Return spring; 15. Through hole; 16. Mounting groove; 17. Cleaning assembly; 171. Mounting ring; 172. Cleaning housing; 173. Sponge; 174. Dustproof ring; 18. Base; 19. Mounting hole. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-3 This utility model provides a technical solution, including a hydraulic cylinder 1. A lower limit ring 2 and an upper limit ring 3 are respectively connected and disposed inside the hydraulic cylinder 1. A first-stage piston 4 is slidably disposed inside the hydraulic cylinder 1 between the lower limit ring 2 and the upper limit ring 3. A first sealing ring 5 is connected to the outer surface of the first-stage piston 4. A first-stage push cylinder 6 is connected to the top of the first-stage piston 4. One end of the first-stage push cylinder 6 extends outside the hydraulic cylinder 1. Oil inlet pipes 7 are connected to both sides of the surface of the hydraulic cylinder 1, and the other end of the oil inlet pipes 7 extends into the hydraulic cylinder 1. Below the limiting ring 2, first pressure relief nozzles 8 are connected to both sides of the surface of the hydraulic cylinder 1, and the other end of the first pressure relief nozzles 8 extends into the interior of the hydraulic cylinder 1 above the upper limit ring 3. Second pressure relief nozzles 9 are connected to both sides of the lower half of the surface of the first stage push cylinder 6, and the other end of the second pressure relief nozzles 9 extends into the upper half of the interior of the first stage push cylinder 6. An oil inlet groove 10 is opened at the top of the interior of the first stage push cylinder 6, and the other end of the second pressure relief nozzles 9 is connected to the oil inlet groove 10. A cleaning component 17 is connected to the top of both the hydraulic cylinder 1 and the first stage push cylinder 6.

[0019] A second-stage piston 11 is slidably disposed inside the first-stage push cylinder 6. A second sealing ring 12 is connected to the outer surface of the second-stage piston 11. A second-stage push cylinder 13 is connected to the top of the second-stage piston 11 and extends outside the first-stage push cylinder 6. Its function is to form a multi-stage push structure by setting the second-stage piston 11 and the second-stage push cylinder 13 inside the first-stage push cylinder 6, which allows for a longer stroke or greater pushing force in a limited space, thus meeting the working conditions with high requirements for pushing distance or force.

[0020] A return spring 14 is connected to the surface of the second-stage push cylinder 13 inside the first-stage push cylinder 6. The function of the return spring 14 is to enable the second-stage push cylinder 13 to quickly return to its original position, preparing for the next push action, reducing the waiting time between two push actions, and thus improving the overall work efficiency.

[0021] The bottom of the first-stage push cylinder 6 has a through hole 15, which is connected to the inside of the first-stage push cylinder 6. Its function is to help quickly release the internal pressure when the push cylinder needs to be reset or stop working, so that the push cylinder can return to the initial position smoothly.

[0022] The cleaning component 17 includes a mounting ring 171 threaded inside the mounting groove 16. A cleaning housing 172 is connected to the top of the mounting ring 171. A sponge 173 is connected inside the cleaning housing 172. Two dustproof rings 174 are connected to the inner surface of the sponge 173. The function of the sponge 173 inside the cleaning housing 172 is that it has good adsorption properties and can effectively adsorb oil, dust and other impurities on the surface of the push cylinder. As the push cylinder reciprocates, the sponge 173 can continuously wipe the surface, keeping the surface of the push cylinder clean and reducing the impact of impurities on the normal operation of the equipment. The mounting ring 171 is threaded inside the mounting groove 16. This threaded connection method is simple and easy to operate, requiring no complicated tools or professional skills, and can quickly install the cleaning component 17 into the designated position.

[0023] The size of the cleaning component 17 at the top of the hydraulic cylinder 1 matches the diameter of the first-stage push cylinder 6, and the size of the cleaning component 17 at the top of the first-stage push cylinder 6 matches the diameter of the second-stage push cylinder 13. The function of the cleaning component 17 is to ensure that the size of the cleaning component 17 matches the diameter of the push cylinder, so that the cleaning component fits tightly against the surface of the push cylinder. Taking the cleaning component at the top of the hydraulic cylinder 1 as an example, it is adapted to the diameter of the first-stage push cylinder 6. When the push cylinder moves, the sponge and dustproof ring of the cleaning component can fully cover the surface of the push cylinder, leaving no corner untouched, effectively removing oil, dust and other impurities, and keeping the surface clean. Similarly, the cleaning component at the top of the first-stage push cylinder 6 matches the diameter of the second-stage push cylinder 13. During the movement of the second-stage push cylinder 13, its surface can also be cleaned in all directions, avoiding the accumulation of impurities due to incomplete cleaning, which would affect the operation of the equipment.

[0024] The bottom end of the hydraulic cylinder 1 is connected to a base 18, and the top end of the base 18 is provided with multiple mounting holes 19. The purpose of these mounting holes 19 is to provide a variety of mounting points, so that the hydraulic cylinder 1 can be firmly installed on the equipment or workbench by bolts or other fasteners.

[0025] Working Principle: Extension Process: Pressurized oil enters the rodless chamber located below the lower limit ring 2 inside the hydraulic cylinder 1 through the oil inlet pipes 7 on both sides of the surface of the hydraulic cylinder 1. Under the action of the pressurized oil, the first-stage piston 4 drives the first-stage push cylinder 6 to gradually extend. After the first-stage push cylinder 6 extends, due to pressure, pressurized oil will enter the interior of the first-stage push cylinder 6 through the through hole 15, pushing the second-stage push cylinder 13 upward, thereby extending the second-stage push cylinder 13. During the process of the piston rod assembly needing to retract, the first pressure relief nozzle 8 and the second pressure relief nozzle 9 play a pressure relief role, accelerating the speed at which the hydraulic cylinder assembly falls back into the hydraulic cylinder. At the same time, the return spring 14 located on the surface of the second-stage push cylinder 13 inside the first-stage push cylinder 6 will also play a role, pushing the second-stage push cylinder 13 to retract, thereby driving the first-stage push cylinder 6 to retract. During the retraction process, the low-pressure oil in the rod chamber will flow out through the corresponding channels, such as the low-pressure oil in the rod chamber of the first-stage cylinder. Pressure oil flows out from the first pressure relief nozzle 8; low-pressure oil in the rod chamber of the second-stage cylinder may flow into the rod chamber of the first-stage cylinder through channels such as the second pressure relief nozzle 9, and finally flow out through the first pressure relief nozzle 8, realizing the return of oil. During the extension and retraction of the push cylinder, the cleaning components 17 at the top of the hydraulic cylinder 1 and the top of the first-stage push cylinder 6 will clean the surface of the push cylinder. The sponge 173 in the cleaning component 17 can absorb oil stains, dust and other impurities on the surface of the push cylinder, keeping the surface clean. The two dustproof rings 174 on the inner surface of the sponge 173 can prevent dust and other impurities from entering the push cylinder, preventing impurities from causing wear on the piston, sealing ring and other components, affecting the normal operation and life of the equipment.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage hydraulic cylinder comprising an oil hydraulic cylinder (1), characterized by: The oil cylinder (1) is internally connected with a lower limit ring (2) and an upper limit ring (3), a first-stage piston (4) is slidably arranged between the lower limit ring (2) and the upper limit ring (3) in the oil cylinder (1), a first sealing ring (5) is connected to the outer surface of the first-stage piston (4), a first-stage push cylinder (6) is connected to the top end of the first-stage piston (4), one end of the first-stage push cylinder (6) extends out of the oil cylinder (1), an oil inlet pipe (7) is connected to the surface of the oil cylinder (1) on both sides, the other end of the oil inlet pipe (7) extends into the oil cylinder (1) below the lower limit ring (2), a first pressure relief nozzle (8) is connected to the surface of the oil cylinder (1) on both sides, the other end of the first pressure relief nozzle (8) extends into the oil cylinder (1) above the upper limit ring (3), a second pressure relief nozzle (9) is connected to the surface of the first-stage push cylinder (6) on both sides in the lower half, the other end of the second pressure relief nozzle (9) extends into the upper half of the first-stage push cylinder (6), an oil inlet groove (10) is formed in the top end of the first-stage push cylinder (6), the other end of the second pressure relief nozzle (9) is in communication with the oil inlet groove (10), and a cleaning assembly (17) is connected to the top end of the oil cylinder (1) and the first-stage push cylinder (6).

2. A multi-stage hydraulic cylinder according to claim 1, characterized in that: A second-stage piston (11) is slidably arranged in the first-stage push cylinder (6), a second sealing ring (12) is connected to the outer surface of the second-stage piston (11), and a second-stage push cylinder (13) is connected to the top end of the second-stage piston (11) and extends out of the first-stage push cylinder (6).

3. A multi-stage hydraulic cylinder according to claim 1, characterized in that: A return spring (14) is connected to the surface of the second-stage push cylinder (13) in the first-stage push cylinder (6).

4. A multi-stage hydraulic cylinder according to claim 1, characterized in that: A through hole (15) is formed in the bottom of the first-stage push cylinder (6), and the through hole (15) is in communication with the interior of the first-stage push cylinder (6).

5. A multi-stage hydraulic cylinder as claimed in claim 1, characterized in that: The cleaning assembly (17) comprises a mounting ring (171) threadedly arranged in a mounting groove (16), a cleaning shell (172) is connected to the top end of the mounting ring (171), a sponge (173) is connected to the interior of the cleaning shell (172), and two dustproof rings (174) are connected to the inner surface of the sponge (173).

6. A multi-stage hydraulic cylinder as claimed in claim 1, characterized in that: The size of the cleaning assembly (17) at the top end of the oil cylinder (1) matches the diameter of the first-stage push cylinder (6), and the size of the cleaning assembly (17) at the top end of the first-stage push cylinder (6) matches the diameter of the second-stage push cylinder (13).

7. A multi-stage hydraulic cylinder as claimed in claim 1, characterized in that: A base (18) is connected to the bottom end of the oil cylinder (1), and a plurality of mounting holes (19) are formed in the top end of the base (18).

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