Sealed multi-stage hydraulic cylinder
By setting up a return oil assembly in a multi-stage hydraulic cylinder, the problem of negative pressure when protruding is solved, the stable extension and rapid reset of the hydraulic cylinder are achieved, and the working efficiency is improved.
Patent Information
- Application Number
- CN202421907278.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-08
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-08-08
AI Technical Summary
When the existing multi-stage hydraulic cylinders are extended, due to the long movement of the outermost piston and the hydraulic rod, it is difficult to establish a return oil channel, resulting in negative pressure, affecting the extension and reset speed of the output end.
A sealed multi-stage hydraulic cylinder is designed, by providing an oil return assembly in the hydraulic cylinder, including opening a first passage and a slide chute in the secondary hydraulic cylinder, and communicating with the rod cavity of the hydraulic cylinder through the first oil transfer pipe, ensuring oil return when the hydraulic cylinder extends, and injecting hydraulic oil during reset to help with rapid reset.
By establishing a return channel, the thrust of the secondary hydraulic cylinder when it extends and quickly recovers during reset, improving working efficiency and applicable scenarios.
Smart Images
Figure CN222910414U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a sealed multi-stage hydraulic cylinder. Background Technique
[0002] A multi-stage hydraulic cylinder is a hydraulically actuated device with a complex design that contains multiple pistons and sealing levels inside, aiming to provide higher force output or longer stroke. This design allows for greater force output or stroke within a smaller overall size, and is suitable for industrial and mechanical applications that require high-performance hydraulic systems.
[0003] In existing multi-stage hydraulic cylinders, due to the relatively long movement process of the outermost set of pistons and the hydraulic rod, it is difficult to establish an oil return channel at the position of the rod chamber. Therefore, when the multi-stage hydraulic cylinder extends, the air in the rod chamber is compressed to generate negative pressure, which affects the extension of the output end of the multi-stage hydraulic cylinder. Also due to the influence of negative pressure, the reset speed of the multi-stage hydraulic cylinder is relatively slow, affecting work efficiency. In view of this, the utility model proposes a sealed multi-stage hydraulic cylinder. Summary of the Utility Model
[0004] The purpose of the utility model is to address the problem in the background technique that when a multi-stage hydraulic cylinder extends, the air in the rod chamber is compressed to generate negative pressure, which affects the extension of the output end of the multi-stage hydraulic cylinder, and under the influence of negative pressure, the reset speed is relatively slow, affecting work efficiency, and to propose a sealed multi-stage hydraulic cylinder.
[0005] The technical solution of the utility model: A sealed multi-stage hydraulic cylinder includes a hydraulic cylinder body. The hydraulic cylinder body includes a base. A hydraulic cylinder barrel is provided on one side of the base. A primary hydraulic rod is slidably connected in the hydraulic cylinder barrel. A secondary hydraulic cylinder is slidably connected in the primary hydraulic rod. Sealing rings are provided between the hydraulic cylinder barrel and the primary hydraulic rod, and between the primary hydraulic rod and the secondary hydraulic cylinder. It also includes an oil return assembly installed in the hydraulic cylinder body. The oil return assembly is used to establish an oil return channel in the hydraulic cylinder body to ensure the stable extension and rapid reset of the secondary hydraulic cylinder; a connection assembly for connecting an oil pump, and the connection assembly is provided on one side of the hydraulic cylinder body.
[0006] Optionally, the oil return assembly includes a first channel opened in the secondary hydraulic cylinder. A vertical chute is also opened in the secondary hydraulic cylinder. A first oil pipeline is slidably connected in the chute. A first sealing rubber sleeve is installed at the bottom of the secondary hydraulic cylinder, and the first sealing rubber sleeve is sleeved outside the first oil pipeline. The first oil pipeline is L-shaped, and one end of the first oil pipeline penetrates through the side wall of the hydraulic cylinder barrel.
[0007] Optionally, the rod chamber of the primary hydraulic rod is communicated with the rod chamber of the hydraulic cylinder barrel through the first channel and the first oil pipeline.
[0008] Optionally, a second oil pipeline is further installed on the outer side of the hydraulic cylinder. The second oil pipeline is arranged in a Z shape, and one end of the second oil pipeline penetrates through the hydraulic cylinder and communicates with its rod chamber.
[0009] Optionally, a first limiting ring is fixedly connected to the inner wall of the rodless chamber of the hydraulic cylinder, a second limiting ring is fixedly connected to the inner wall of the rod chamber of the hydraulic cylinder, and a third limiting ring is installed on the inner wall of the rodless chamber of the primary hydraulic rod.
[0010] Optionally, the connection assembly includes a first connection head installed on the outer side of the base. The first connection head communicates with the rod chamber of the hydraulic cylinder. A positioning plate is installed on the top of the base. The end of the second oil pipeline away from the hydraulic cylinder is fixedly connected in the positioning plate. A second connection head communicating with the second oil pipeline is further installed on the side surface of the positioning plate.
[0011] Optionally, a sealing and dust-proof mechanism is further installed on the hydraulic cylinder body. The sealing and dust-proof mechanism is used to prevent dust from adhering to the secondary hydraulic cylinder and being brought into the primary hydraulic rod.
[0012] Optionally, the sealing and dust-proof mechanism includes a first dust-proof cylinder installed on the top of the base. A second dust-proof cylinder is slidably connected in the first dust-proof cylinder. A synchronous cylinder is slidably connected in the second dust-proof cylinder. The secondary hydraulic cylinder penetrates through the synchronous cylinder and is fixedly connected thereto.
[0013] Optionally, a card slot corresponding to the positioning plate is opened at the bottom of the first dust-proof cylinder. A plurality of groups of through holes are opened at the bottoms of the first dust-proof cylinder, the second dust-proof cylinder, and the synchronous cylinder. A dust-proof net is arranged inside the through holes. Second sealing rubber sleeves are arranged at the sliding positions between the first dust-proof cylinder and the second dust-proof cylinder and between the second dust-proof cylinder and the synchronous cylinder.
[0014] In summary, the present application includes at least one of the following beneficial technical effects:
[0015] Through the setting of the oil return assembly in the present utility model, when the second connection head is connected to an oil pump, oil can be returned when the secondary hydraulic cylinder extends, thereby ensuring the thrust when the secondary hydraulic cylinder extends. At the same time, when the secondary hydraulic cylinder contracts, hydraulic oil can be injected into the rod chamber through the second connection head to help the secondary hydraulic cylinder quickly reset, improving work efficiency and applicable scenarios.
[0016] Furthermore, through the setting of the sealing and dust-proof mechanism, the synchronous cylinder moves synchronously with the secondary hydraulic cylinder and also moves in a multi-stage manner, avoiding dust from adhering to the secondary hydraulic cylinder and preventing the hydraulic oil in the rod chamber from being polluted, improving the service life of the hydraulic cylinder body.
[0017] In summary, the present utility model establishes an oil return passage in the multi-stage hydraulic cylinder, ensuring the thrust of the secondary hydraulic cylinder during extension, facilitating the rapid reset of the secondary hydraulic cylinder for reciprocating motion, and avoiding contamination of the hydraulic oil. Description of the Drawings
[0018] Figure 1 is a schematic structural diagram of a sealed multi-stage hydraulic cylinder;
[0019] Figure 2 is Figure 1 a cross-sectional schematic diagram of
[0020] Figure 3 is a cross-sectional schematic diagram of the secondary hydraulic cylinder;
[0021] Figure 4 is a cross-sectional schematic diagram of the sealing and dust-proof mechanism.
[0022] Reference Numerals:
[0023] 1, hydraulic cylinder body; 11, base; 12, hydraulic cylinder barrel; 13, primary hydraulic rod; 14, secondary hydraulic cylinder;
[0024] 2, oil return assembly; 21, first channel; 22, chute; 23, first oil pipeline; 24, first sealing rubber sleeve; 25, second oil pipeline; 26, first limiting ring; 27, second limiting ring; 28, third limiting ring;
[0025] 3, connection assembly; 31, first connection head; 32, positioning plate; 33, second connection head;
[0026] 4, sealing and dust-proof mechanism; 41, first dust-proof cylinder; 42, second dust-proof cylinder; 43, synchronous cylinder; 44, card slot; 45, through hole; 46, second sealing rubber sleeve. Detailed Embodiment
[0027] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model.
[0028] Generally, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents the selected embodiments of the present utility model.
[0029] Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.
[0030] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0031] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0032] Embodiment
[0033] As Figure 1 and Figure 2 As shown, a sealed multi-stage hydraulic cylinder proposed by the present utility model includes a hydraulic cylinder body 1. The hydraulic cylinder body 1 includes a base 11. A hydraulic cylinder barrel 12 is provided on one side of the base 11. A first-stage hydraulic rod 13 is slidably connected in the hydraulic cylinder barrel 12. A secondary hydraulic cylinder 14 is slidably connected in the first-stage hydraulic rod 13. Sealing rings are provided between the hydraulic cylinder barrel 12 and the first-stage hydraulic rod 13, and between the first-stage hydraulic rod 13 and the secondary hydraulic cylinder 14 to ensure sealed operation and prevent hydraulic oil from passing through.
[0034] Furthermore, please refer to Figure 2 and Figure 3, the above hydraulic cylinder further includes an oil return assembly 2 installed in the hydraulic cylinder body 1. The oil return assembly 2 is used to establish an oil return channel in the hydraulic cylinder body 1 to ensure the stable extension and rapid reset of the secondary hydraulic cylinder 14. The oil return assembly 2 includes a first channel 21 opened in the secondary hydraulic cylinder 14. A vertical chute 22 is also opened in the secondary hydraulic cylinder 14. A first oil pipe 23 is slidably connected in the chute 22. When the secondary hydraulic cylinder 14 extends, the first oil pipe 23 slides in the chute 22 without affecting the oil delivery channel for hydraulic oil. A first sealing rubber sleeve 24 is installed at the bottom of the secondary hydraulic cylinder 14. The first sealing rubber sleeve 24 is sleeved outside the first oil pipe 23. The first oil pipe 23 is L-shaped. One end of the first oil pipe 23 penetrates the side wall of the hydraulic cylinder 12. The rod chamber of the primary hydraulic rod 13 is communicated with the rod chamber of the hydraulic cylinder 12 through the first channel 21 and the first oil pipe 23. Thus, when the secondary hydraulic cylinder 14 extends, the hydraulic oil in the rod chamber of the primary hydraulic rod 13 can flow into the rod chamber of the hydraulic cylinder 12 to avoid generating negative pressure and ensure the smooth extension of the secondary hydraulic cylinder 14. A second oil pipe 25 is also installed outside the hydraulic cylinder 12. The second oil pipe 25 is Z-shaped. One end of the second oil pipe 25 penetrates the hydraulic cylinder 12 and is communicated with its rod chamber to facilitate the outflow of the hydraulic oil in the rod chamber of the hydraulic cylinder 12. A first limit ring 26 is fixedly connected to the inner wall of the rodless chamber of the hydraulic cylinder 12. The first limit ring 26 is used to prevent the primary hydraulic rod 13 from retracting excessively. A second limit ring 27 is fixedly connected to the inner wall of the rod chamber of the hydraulic cylinder 12. The second limit ring 27 is used to prevent the primary hydraulic rod 13 from extending too much and causing one end of the second oil pipe 25 to be blocked. A third limit ring 28 is installed on the inner wall of the rodless chamber of the primary hydraulic rod 13. The third limit ring 28 is used to prevent the secondary hydraulic cylinder 14 from extending too long and causing one end of the first channel 21 to be blocked.
[0035] Furthermore, the above hydraulic cylinder further includes a connection assembly 3 for connecting an oil pump. The connection assembly 3 is arranged on one side of the hydraulic cylinder body 1. The connection assembly 3 includes a first connection head 31 installed outside the base 11. The first connection head 31 is communicated with the rod chamber of the hydraulic cylinder 12. A positioning plate 32 is installed on the top of the base 11. The end of the second oil pipe 25 away from the hydraulic cylinder 12 is fixedly connected in the positioning plate 32. A second connection head 33 communicated with the second oil pipe 25 is also installed on the side of the positioning plate 32. The first connection head 31 and the second connection head 33 are respectively connected to two groups of oil pumps, which is convenient for controlling the extension length of the secondary hydraulic cylinder 14 by controlling the flow direction of the hydraulic oil.
[0036] Finally, the above hydraulic cylinder further includes a sealing and dust-proof mechanism 4 installed on the hydraulic cylinder body 1. The sealing and dust-proof mechanism 4 is used to prevent dust from adhering to the secondary hydraulic cylinder 14 and being brought into the primary hydraulic rod 13. The sealing and dust-proof mechanism 4 includes a first dust-proof cylinder 41 installed on the top of the base 11. A second dust-proof cylinder 42 is slidably connected in the first dust-proof cylinder 41. A synchronous cylinder 43 is slidably connected in the second dust-proof cylinder 42. The secondary hydraulic cylinder 14 passes through the synchronous cylinder 43 and is fixedly connected thereto. A card slot 44 corresponding to the positioning plate 32 is provided at the bottom of the first dust-proof cylinder 41, and the position of the first dust-proof cylinder 41 is fixed. The synchronous cylinder 43 moves synchronously with the secondary hydraulic cylinder 14, and through the arrangement of the second dust-proof cylinder 42, the synchronous cylinder 43 can still remain outside the secondary hydraulic cylinder 14 when the extended length of the secondary hydraulic cylinder 14 is relatively long. A plurality of groups of through holes 45 are provided at the bottoms of the first dust-proof cylinder 41, the second dust-proof cylinder 42, and the synchronous cylinder 43. A dust-proof net is provided inside the through holes 45 to prevent the formation of negative pressure inside the first dust-proof cylinder 41, the second dust-proof cylinder 42, and the synchronous cylinder 43, and at the same time prevent dust from entering. Second sealing rubber sleeves 46 are provided at the sliding positions between the first dust-proof cylinder 41 and the second dust-proof cylinder 42 and between the second dust-proof cylinder 42 and the synchronous cylinder 43 to facilitate improving the sealing performance.
[0037] In this embodiment, first, when the oil pump connected at the first connector 31 injects hydraulic oil into the rodless cavity of the hydraulic cylinder 12, the secondary hydraulic cylinder 14 extends. At this time, the hydraulic oil in the rod chamber of the primary hydraulic rod 13 flows into the rod chamber of the hydraulic cylinder 12 through the first channel 21 and the first oil pipeline 23. At the same time, the hydraulic oil in the rod chamber of the hydraulic cylinder 12 is discharged from the second connector 33 through the second oil pipeline 25, so that the secondary hydraulic cylinder 14 can stably output. At the same time, the synchronous cylinder 43 moves synchronously with the secondary hydraulic cylinder 14 to prevent dust from adhering to the surface of the secondary hydraulic cylinder 14, thereby preventing the hydraulic oil from being contaminated and ensuring the service life and reliability. At the same time, when the oil pump connected at the second connector 33 inputs hydraulic oil into the rod chamber, the secondary hydraulic cylinder 14 can be quickly reset, which is convenient for accelerating the reciprocating movement speed and improving the working efficiency.
[0038] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant revelations of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.
Claims
1. A sealed multi-stage hydraulic cylinder, comprising a hydraulic cylinder body (1), wherein the hydraulic cylinder body (1) comprises a base (11), a hydraulic cylinder (12) is arranged on one side of the base (11), a primary hydraulic rod (13) is slidably connected in the hydraulic cylinder (12), a secondary hydraulic cylinder (14) is slidably connected in the primary hydraulic rod (13), a sealing ring is arranged between the hydraulic cylinder (12) and the primary hydraulic rod (13) and between the primary hydraulic rod (13) and the secondary hydraulic cylinder (14), and characterized in that: Also includes: An oil return assembly (2) installed in the hydraulic cylinder body (1), the oil return assembly (2) being used to establish an oil return channel in the hydraulic cylinder body (1) to ensure stable extension and rapid resetting of the secondary hydraulic cylinder (14); A connecting component (3) for connecting an oil pump, wherein the connecting component (3) is arranged on one side of a hydraulic cylinder body (1).
2. A sealed multi-stage hydraulic cylinder according to claim 1, characterized in that: The oil return assembly (2) comprises a first channel (21) opened in the secondary hydraulic cylinder (14), a vertical slide groove (22) is also opened in the secondary hydraulic cylinder (14), a first oil delivery pipe (23) is slidably connected in the slide groove (22), a first sealing rubber sleeve (24) is installed at the bottom of the secondary hydraulic cylinder (14), the first sealing rubber sleeve (24) is sleeved and installed on the outside of the first oil delivery pipe (23), the first oil delivery pipe (23) is L-shaped, and one end of the first oil delivery pipe (23) passes through the side wall of the hydraulic cylinder (12).
3. A sealed multi-stage hydraulic cylinder according to claim 2, characterized in that: The rod chamber of the primary hydraulic rod (13) is connected to the rod chamber of the hydraulic cylinder (12) through the first channel (21) and the first oil delivery pipe (23).
4. A sealed multi-stage hydraulic cylinder according to claim 3, characterized in that: A second oil delivery pipe (25) is also installed on the outside of the hydraulic cylinder (12). The second oil delivery pipe (25) is arranged in a Z shape. One end of the second oil delivery pipe (25) passes through the hydraulic cylinder (12) and is connected to the rod cavity thereof.
5. A sealed multi-stage hydraulic cylinder according to claim 4, characterized in that: The inner wall of the rodless cavity of the hydraulic cylinder (12) is fixedly connected to a first limiting ring (26), the inner wall of the rod cavity of the hydraulic cylinder (12) is fixedly connected to a second limiting ring (27), and the inner wall of the rodless cavity of the primary hydraulic rod (13) is installed with a third limiting ring (28).
6. A sealed multi-stage hydraulic cylinder according to claim 4, characterized in that: The connecting assembly (3) comprises a first connecting head (31) installed on the outside of the base (11), the first connecting head (31) is connected to the rod chamber of the hydraulic cylinder (12), a positioning plate (32) is installed on the top of the base (11), one end of the second oil pipeline (25) away from the hydraulic cylinder (12) is fixedly connected to the positioning plate (32), and a second connecting head (33) connected to the second oil pipeline (25) is also installed on the side of the positioning plate (32).
7. A sealed multi-stage hydraulic cylinder according to claim 6, characterized in that: It also includes a sealing dustproof mechanism (4) installed on the hydraulic cylinder body (1), and the sealing dustproof mechanism (4) is used to prevent dust from adhering to the secondary hydraulic cylinder (14) and being brought into the primary hydraulic rod (13).
8. A sealed multi-stage hydraulic cylinder according to claim 7, characterized in that: The sealing dustproof mechanism (4) comprises a first dustproof cylinder (41) mounted on the top of the base (11); a second dustproof cylinder (42) is slidably connected to the first dustproof cylinder (41); a synchronous cylinder (43) is slidably connected to the second dustproof cylinder (42); and the secondary hydraulic cylinder (14) passes through the synchronous cylinder (43) and is fixedly connected thereto.
9. A sealed multi-stage hydraulic cylinder according to claim 8, characterized in that: The bottom of the first dustproof cylinder (41) is provided with a slot (44) corresponding to the positioning plate (32); the bottoms of the first dustproof cylinder (41), the second dustproof cylinder (42) and the synchronous cylinder (43) are provided with a plurality of through holes (45); the inner sides of the through holes (45) are provided with dustproof nets; the sliding positions of the first dustproof cylinder (41) and the second dustproof cylinder (42) and the sliding positions of the second dustproof cylinder (42) and the synchronous cylinder (43) are provided with second sealing rubber sleeves (46).