A multi-stage hydraulic cylinder

By setting up a support device in a multi-stage hydraulic cylinder to achieve small angle deflection, the problem of heavy objects falling when the hydraulic cylinder is hoisted is solved, and the fallback speed of the hydraulic cylinder assembly is improved through the return spring and airflow exchange hole, achieving a more stable operation and a more efficient fallback process.

CN222746361UActive Publication Date: 2025-04-11YANGZHOU YONGFA PNEUMATIC HYDRAULIC PRESSURE EQUIP CO LTD
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Patent Information

Application Number
CN202420800617.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-17
Publication Date
2025-04-11
Estimated Expiration
2034-04-17

AI Technical Summary

Technical Problem

When the existing multi-stage hydraulic cylinders lift heavy objects, the plane of the heavy object under stress is difficult to keep parallel to the plane of the top of the hydraulic cylinder due to the insufficient level of the top surface, resulting in the heavy object falling.

Method used

A multi-stage hydraulic cylinder is designed, and by providing a support device, the hydraulic cylinder can be deflected at a small angle, so that the top plane of the hydraulic cylinder can be parallel to the stress plane of different weights.

Benefits of technology

Through small angle deflection, the hydraulic cylinder is more stable when lifting the heavy objects, avoiding the risk of heavy objects falling. At the same time, by setting up a reset spring and airflow exchange hole, the fallback speed of the hydraulic cylinder assembly is improved and the time for staff to wait for storage is reduced.

✦ Generated by Eureka AI based on patent content.

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    Figure CN222746361U_ABST
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Abstract

The utility model discloses a multi-stage hydraulic cylinder, and the utility model relates to the technical field of hydraulic cylinders. The device comprises: an oil hydraulic cylinder; an inlet and outlet pipe; a support device, the top of the support device is fixedly connected to the bottom of the oil hydraulic cylinder; a first-stage push cylinder, the outer wall of the first-stage push cylinder is slidably connected to the inner wall of the oil hydraulic cylinder; a second-stage push cylinder, the outer wall of the second-stage push cylinder is slidably connected to the inner wall of the first-stage push cylinder; a push rod, the outer wall of the push rod is slidably connected to the inner wall of the second-stage push cylinder; a first pressure relief nozzle, the outer wall of the first pressure relief nozzle is fixedly connected to the inner wall of the oil hydraulic cylinder; a second pressure relief nozzle, the outer wall of the second pressure relief nozzle is fixedly connected to the inner wall of the first push cylinder; by setting the support device, the multi-stage hydraulic cylinder can be deflected at a small angle, so that the top plane of the hydraulic cylinder can be parallel to the force plane of different weights, so that the hydraulic cylinder is more stable when lifting weights, and the purpose of adjusting the inclination angle of the hydraulic cylinder is achieved.
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Claims

1. A multi-stage hydraulic cylinder, characterized in that: include: Hydraulic cylinder (1); An inlet and outlet pipe (2), the outer wall of the inlet and outlet pipe (2) being fixedly connected to the inner wall of the hydraulic cylinder (1); A support device (3), the support device (3) is used to change the angle of the hydraulic cylinder, and the top of the support device (3) is fixedly connected to the bottom of the hydraulic cylinder (1); A first-stage pushing cylinder (4), wherein the outer wall of the first-stage pushing cylinder (4) is slidably connected to the inner wall of the oil pressure cylinder (1); A second-stage pushing cylinder (5), wherein the outer wall of the second-stage pushing cylinder (5) is slidably connected to the inner wall of the first-stage pushing cylinder (4); A push rod (6), the outer wall of the push rod (6) being slidably connected to the inner wall of the second-stage push cylinder (5); A first pressure relief nozzle (7), the outer wall of the first pressure relief nozzle (7) being fixedly connected to the inner wall of the oil pressure cylinder (1); A second pressure relief nozzle (9), the outer wall of the second pressure relief nozzle (9) being fixedly connected to the inner wall of the first-stage push cylinder (4); The support device (3) comprises a support platform (31), the inner wall of the support platform (31) is rotatably connected to a lifting plate (37), the inner wall of the support platform (31) is rotatably connected to a rotating shaft (32), the outer wall of the rotating shaft (32) is fixedly connected to a bidirectional threaded sleeve (33), the outer wall of the bidirectional threaded sleeve (33) is threadedly connected to a sliding block (34), the inner wall of the sliding block (34) is rotatably connected to a push rod (35), the inner wall of the push rod (35) is rotatably connected to a lifting block (36) via a connecting rod, and the top of the lifting block (36) is slidably connected to the bottom of the lifting plate (37).

2. A multi-stage hydraulic cylinder according to claim 1, characterized in that: The outer wall of the sliding block (34) is slidably connected to the inner wall of the support platform (31), the top of the lifting plate (37) is fixedly connected to the bottom of the hydraulic cylinder (1), and the bottom of the hydraulic cylinder (1) is in contact with the top of the support platform (31).

3. A multi-stage hydraulic cylinder according to claim 2, characterized in that: A first return spring (8) is fixedly connected to the top of the inner wall of the oil hydraulic cylinder (1), and the bottom end of the first return spring (8) is fixedly connected to the bottom of the outer wall of the first-stage push cylinder (4). A second return spring (10) is fixedly connected to the top of the inner wall of the first-stage push cylinder (4), and the bottom end of the second return spring (10) is fixedly connected to the bottom of the outer wall of the second-stage push cylinder (5).

4. A multi-stage hydraulic cylinder according to claim 1, characterized in that: The inner wall of the push rod (6) is provided with a threaded plug (62) which slides through a connecting groove (61), and the connecting groove (61) is provided in the wall of the push rod (6). A connecting hole (63) is provided in the wall of the push rod (6), and the connecting hole (63) is connected to the connecting groove (61). An airflow exchange hole (64) is provided in the wall of the push rod (6), and a protective plug (65) is inserted into the inner wall of the push rod (6).

5. A multi-stage hydraulic cylinder according to claim 4, characterized in that: The inner wall of the push rod (6) is threadedly connected to the outer wall of the threaded plug (62).