A multi-stage hydraulic cylinder with a mechanical locking mechanism
By introducing a mechanical locking mechanism into a multi-stage hydraulic cylinder, and using a bracket, a clamp, and elastic components in conjunction with an electric push rod, the problem of piston loss due to hydraulic leakage is solved, achieving mechanical locking and automatic reset of the piston, thus improving safety and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGZHOU WUJIN ANWEI HYDRAULIC PARTS MFG CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-10
AI Technical Summary
Existing multi-stage hydraulic cylinders rely on hydraulic system seals, and hydraulic leaks can easily cause the piston to lose its fixation, posing a safety hazard.
A mechanical locking mechanism is adopted, which, through the cooperation of the first positioning hole, the insert and the card holder, combined with the elastic component and the electric push rod, realizes the mechanical locking and automatic reset of the piston, ensuring that the piston does not fall directly when the hydraulic system leaks.
In the event of a hydraulic system leak, it can effectively prevent the piston from falling, provide a buffer time, improve safety and service life, and ensure operator safety.
Smart Images
Figure CN224479113U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of multi-stage hydraulic cylinder technology, and more specifically to a multi-stage hydraulic cylinder with a mechanical locking mechanism. Background Technology
[0002] A multistage hydraulic cylinder consists of multiple nested cylinder barrels and piston assemblies. It typically employs a telescopic sleeve design, where the piston rod of the previous stage serves as the support for the cylinder barrel of the next stage, forming a progressively telescopic sleeve structure.
[0003] A search revealed Chinese patent CN209800422U, which discloses a multi-stage hydraulic cylinder. Hydraulic oil pushes each piston rod to move towards the cylinder body, and the multi-stage hydraulic cylinder is in a contracted state to prevent the oil pipeline from being exposed outside the multi-stage hydraulic cylinder and damaged by collision. However, the stopping and fixing of the hydraulic cylinder pistons relies on oil pressure, which is very dependent on the sealing of the hydraulic system. When the hydraulic system leaks, the hydraulic cylinder loses its fixing effect, and during use, there is a risk that the supported object may suddenly fall, threatening the life safety of the workers. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, the present invention provides a multi-stage hydraulic cylinder with a mechanical locking mechanism to solve the problems existing in the background art.
[0005] This utility model provides the following technical solution: a multi-stage hydraulic cylinder with a mechanical locking mechanism, comprising a cylinder body, a first piston, and a second piston. The first piston, the second piston, and the cylinder body constitute the main body of the multi-stage hydraulic cylinder. A limit rod is welded to one side of the cylinder body, and a plurality of first positioning holes are provided on one side of the limit rod. A first movable frame is welded to one side of the first piston and slidably connected to the limit rod. A first sliding hole is provided on one side of the first movable frame, and a bracket with one end inserted into the first positioning hole is slidably connected in the first sliding hole. A first elastic component that pulls the bracket to move is provided between the bracket and the first movable frame. A first power component that drives the bracket to move out of the first positioning hole is provided on one side of the first movable frame. A second movable frame that slides on both sides of the first movable frame is welded to one side of the second piston. A second positioning hole is provided on both sides of the second movable frame. A second sliding hole is provided at the top of both sides of the first movable frame. A bracket with one end inserted into the second positioning hole is slidably connected in the second sliding hole. A second elastic component that pushes the bracket to move outward is provided between the bracket and the second sliding hole. A second power component that drives the bracket to move out of the second positioning hole is provided on one side of the first movable frame.
[0006] As a further embodiment of this utility model, the first elastic component is a tension spring, and the two ends of the tension spring are respectively fixed to the opposite sides of the insert and the first movable frame.
[0007] As a further embodiment of this utility model, the first power assembly includes a first electric push rod fixed to the bottom end of one side of the first movable frame. The movable end of the first electric push rod is fixed with a trapezoidal block by bolts. The top of the insert is provided with a clearance hole, and the trapezoidal block can be inserted into the clearance hole.
[0008] As a further embodiment of this utility model, the second elastic component is a spring, and the two ends of the spring are respectively fixed to the opposite sides of the card holder and the second sliding hole.
[0009] As a further embodiment of this utility model, the second power assembly includes a second electric push rod fixed to the top of one side of the first movable frame. The moving end of the second electric push rod is fixed to the extrusion frame by bolts, and the inclined surface of the extrusion frame is in contact with the card holder.
[0010] As a further embodiment of this utility model, multiple mounting slots are provided on the opposite sides of the two card holders, and rollers are tumblingly connected in the mounting slots.
[0011] As a further embodiment of this utility model, a fixing rod is welded to both sides of the first piston, and a limiting ring that is fixed to the first movable frame is welded to the bottom of the fixing rod, with a notch on one side of the limiting ring.
[0012] The technical effects and advantages of this utility model are as follows:
[0013] 1. By using the first positioning hole, the second positioning hole, the insert bracket and the card holder in combination, this utility model can limit the cylinder even if the pressure inside the cylinder is lost after a leak in the hydraulic system, so that the first piston and the second piston will not fall directly, giving the staff time to move away and improving the protective effect of the device.
[0014] 2. This utility model, by providing a first elastic component and a second elastic component, allows the tension spring to pull the insert bracket to automatically reset and the spring to push the clamp bracket to automatically reset, thereby achieving automatic locking when the hydraulic cylinder stops and improving the safety of hydraulic cylinder use.
[0015] 3. This utility model, by providing a first power component and a second power component, can continuously release the limit between the first moving frame and the limit rod, and the limit between the second moving frame and the first moving frame. The unlocking of the first piston is controlled by electrical components, allowing the operator to operate remotely, further improving the safety of the hydraulic cylinder. Attached Figure Description
[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0017] Figure 2 This is an enlarged structural schematic diagram of the first power component of this utility model.
[0018] Figure 3 This is a cross-sectional view of the first power component of this utility model.
[0019] Figure 4 This is an enlarged structural schematic diagram of the second power component of this utility model.
[0020] Figure 5 This is a cross-sectional view of the second power component of this utility model.
[0021] The attached figures are labeled as follows: 1. Cylinder body; 2. First piston; 3. Second piston; 4. Fixed rod; 5. Limiting ring; 6. Limiting rod; 7. First moving frame; 8. First electric push rod; 9. Trapezoidal block; 10. Insert bracket; 11. First positioning hole; 13. Tension spring; 14. Alternating hole; 15. First sliding hole; 16. Second moving frame; 17. Second electric push rod; 18. Second positioning hole; 19. Extrusion frame; 20. Card holder; 21. Spring; 22. Second sliding hole; 23. Roller. Detailed Implementation
[0022] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. In addition, the forms of the various structures described in the following embodiments are merely illustrative. This utility model is not limited to the structures described in the following embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0023] Reference Figures 1-5This utility model provides a multi-stage hydraulic cylinder with a mechanical locking mechanism, including a cylinder body 1, a first piston 2, and a second piston 3. The first piston 2, the second piston 3, and the cylinder body 1 constitute the main body of the multi-stage hydraulic cylinder. A limit rod 6 is welded to one side of the cylinder body 1, and a plurality of first positioning holes 11 are provided on one side of the limit rod 6. A first movable frame 7, which is slidably connected to the limit rod 6, is welded to one side of the first piston 2. A first sliding hole 15 is provided on one side of the first movable frame 7, and a plug 10, one end of which is inserted into the first positioning hole 11, is slidably connected in the first sliding hole 15. A first elastic component is provided between the plug 10 and the first movable frame 7 to pull the plug 10 to move. A component on one side of the first movable frame 7 is provided to move the plug 10 out of the first positioning hole 11. The first power assembly with positioning hole 11 has a second movable frame 16 welded to one side of the second piston 3, which slides on both sides of the first movable frame 7. The second movable frame 16 has second positioning holes 18 on both sides. The top of both sides of the first movable frame 7 has second sliding holes 22. A retainer 20, one end of which is inserted into the second positioning hole 18, is slidably connected within the second sliding hole 22. A second elastic component is provided between the retainer 20 and the second sliding hole 22 to push the retainer 20 outward. A second power assembly is provided on one side of the first movable frame 7 to move the retainer 20 out of the second positioning hole 18. In use, during the process of the first piston 2 moving out of the cylinder 1, the first piston 2 will drive the first movable frame 7 to move upward, thereby moving the first positioning hole 11... 1. The inclined surface on one side of the insert 10 is pressed, causing the insert 10 to move within the first sliding hole 15, thereby disengaging one end of the insert 10 from the first positioning hole 11. Under the action of the first elastic component, the insert 10 will move back to another first positioning hole 11, repeating this process until the first piston 2 stops moving, thus preventing the first moving frame 7 from moving downwards and achieving mechanical locking of the height of the first piston 2. During the process of the second piston 3 moving out of the first piston 2, the upward movement of the second piston 3 will drive the second moving frame 16 to move upwards, thereby causing the second positioning hole 18 to press against the inclined surface on one side of the card holder 20, causing one end of the card holder 20 to move out of the second positioning hole 18. Under the action of the second elastic component, the card holder 2... The piston 0 will re-enter the next second positioning hole 18, repeating this process until the second piston 3 stops moving, thus preventing the second moving frame 16 from moving downwards and achieving mechanical locking of the height of the second piston 3. When the hydraulic cylinder needs to be reset, the first power assembly and the second power assembly are used to drive the insert frame 10 and the card holder 20 to move out of their corresponding first positioning hole 11 and second positioning hole 18, respectively, and maintain this state for a long time, so that the first piston 2 and the second piston 3 can be reset. When the hydraulic system leaks, even if the pressure inside the cylinder 1 is lost, it can still be limited, so that the first piston 2 and the second piston 3 will not fall directly, giving the staff time to move away and improving the protective effect of the device.
[0024] In this utility model, the first elastic component is a tension spring 13, with both ends of the tension spring 13 fixed to the opposite sides of the insert 10 and the first movable frame 7, respectively. The tension spring 13 pulls the insert 10 to automatically reset. The second elastic component is a spring 21, with both ends of the spring 21 fixed to the opposite sides of the card holder 20 and the second sliding hole 22, respectively. The spring 21 pushes the card holder 20 to automatically reset, thereby automatically locking the hydraulic cylinder when it stops and improving the safety of the hydraulic cylinder.
[0025] The first power assembly includes a first electric push rod 8 fixed to the bottom of one side of the first movable frame 7. The movable end of the first electric push rod 8 is fixed with a trapezoidal block 9 by bolts. The top of the insert 10 has a through hole 14, and the trapezoidal block 9 can be inserted into the through hole 14. When the first piston 2 needs to be reset, the first electric push rod 8 is activated. The extension of the first electric push rod 8 will drive the trapezoidal block 9 to move downward, so that the inclined surface of the trapezoidal block 9 presses against the through hole 14, causing the insert 10 to slide in the first sliding hole 15. This allows one end of the insert 10 to completely disengage from the first positioning hole 11, releasing the restriction between the first movable frame 7 and the limiting rod 6, so that the first movable frame 7 and the first piston 2 can move downward, realizing the reset of the first piston 2. The unlocking of the first piston 2 is controlled by electrical components, and the operator can operate it remotely, further improving the safety of the hydraulic cylinder.
[0026] The second power assembly includes a second electric push rod 17 fixed to the top of one side of the first moving frame 7. The moving end of the second electric push rod 17 is fixed to the pressing frame 19 by bolts, and the inclined surface of the pressing frame 19 is in contact with the clamping frame 20. When the second piston 3 needs to be reset, the second electric push rod 17 is activated. The extension of the second electric push rod 17 will drive the pressing frame 19 to move upward, so that the two opposite inclined surfaces of the pressing frame 19 press one side of the clamping frame 20, causing the clamping frame 20 to slide in the second sliding hole 22, thereby completely disengaging one end of the clamping frame 20 from the second positioning hole 18, releasing the limit between the second moving frame 16 and the first moving frame 7, so that the second moving frame 16 and the second piston 3 can move downward, realizing the reset of the second piston 3. Similarly, the contact of the second piston 3 is controlled by electrical components, improving the safety of the hydraulic cylinder.
[0027] The two card holders 20 are provided with multiple mounting slots on opposite sides. Rollers 23 are rotatably connected in the mounting slots. Rollers 23 are also rotatably connected to the contact surface between the clearance hole 14 and the insert 10. This reduces the friction between the insert 10 and the clearance hole 14 and between the card holder 20 and the compression frame 19, making it easier for the card holder 20 and the insert 10 to be compressed and moved.
[0028] Furthermore, fixing rods 4 are welded to both sides of the first piston 2. A limiting ring 5, which is fixed to the first moving frame 7, is welded to the bottom of the fixing rod 4. One side of the limiting ring 5 is a notch. The notch avoids the connection between the cylinder body 1 and the external hydraulic oil pipe, and provides auxiliary limiting for the first moving frame 7, making it less likely to completely stop and improving the service life of the hydraulic cylinder.
[0029] It should be further explained that the first electric push rod 8 and the second electric push rod 17 are both standard electrical components. Their structure and principle can be learned by the technical personnel through technical manuals or conventional experimental methods, and will not be elaborated on here.
[0030] The working principle of this utility model is as follows: During the process of the first piston 2 moving out of the cylinder 1, the first piston 2 will drive the first moving frame 7 to move upward, thereby causing the first positioning hole 11 to press against the inclined surface on one side of the insert 10, causing the insert 10 to move within the first sliding hole 15, and thus causing one end of the insert 10 to disengage from the first positioning hole 11. When the insert 10 moves to the next first positioning hole 11, the stretched tension spring 13 will return to its original position, pulling the insert 10 back to its original position, thereby causing one end of the insert 10 to re-insert into the first positioning hole 11, completing the mechanical locking of the first piston 2. During the process of the second piston 3 moving out of the first piston 2, the second piston 3 moves upward. The movement will cause the second moving frame 16 to move upward, thereby causing the second positioning hole 18 to press against the inclined surface on one side of the bracket 20, so that one end of the bracket 20 moves out of the second positioning hole 18. When the bracket 20 moves to the next second positioning hole 18, the compressed spring 21 will reset and push the bracket 20 to reset, so that one end of the bracket 20 is re-engaged into the second positioning hole 18, completing the mechanical locking of the height of the second piston 3. When the hydraulic system leaks, even if the pressure inside the cylinder 1 is lost, it can still limit it, so that the first piston 2 and the second piston 3 will not fall directly, giving the staff time to move away and improving the protective effect of the device.
[0031] Finally, the following points should be noted: In the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly, and can be mechanical or electrical connection, or internal connection between two components, or direct connection. "Up", "down", "left", "right", etc. are only used to indicate relative positional relationship. When the absolute position of the described object changes, the relative positional relationship may change.
[0032] The electronic components and modules used in this utility model can all be parts that are commonly used in the market and can achieve the specific functions in this case. The specific models and sizes can be selected and adjusted according to actual needs.
[0033] The accompanying drawings of the embodiments disclosed in this utility model only involve the structures involved in the embodiments disclosed in this utility model. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this utility model can be combined with each other.
Claims
1. A multi-stage hydraulic cylinder with a mechanical locking mechanism, comprising a cylinder body (1), a first piston (2), and a second piston (3), wherein the first piston (2), the second piston (3), and the cylinder body (1) constitute the main body of the multi-stage hydraulic cylinder, characterized in that: A limiting rod (6) is fixedly connected to one side of the cylinder (1). A plurality of first positioning holes (11) are provided on one side of the limiting rod (6). A first movable frame (7) is fixedly connected to one side of the first piston (2) and slidably connected to the limiting rod (6). A first sliding hole (15) is provided on one side of the first movable frame (7). A plug (10) with one end inserted into the first positioning hole (11) is slidably connected in the first sliding hole (15). A first elastic component is provided between the plug (10) and the first movable frame (7) to pull the plug (10) to move. A first elastic component is provided on one side of the first movable frame (7) to drive the plug (10) out of the first positioning hole (11). A power assembly is provided, wherein a second moving frame (16) is fixedly connected to one side of the second piston (3) and slides on both sides of the first moving frame (7). The second moving frame (16) has a second positioning hole (18) on both sides. The top of both sides of the first moving frame (7) has a second sliding hole (22). A card holder (20) with one end inserted into the second positioning hole (18) is slidably connected in the second sliding hole (22). A second elastic component is provided between the card holder (20) and the second sliding hole (22) to push the card holder (20) to move outward. A second power assembly is provided on one side of the first moving frame (7) to drive the card holder (20) to move out of the second positioning hole (18).
2. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 1, characterized in that: The first elastic component is a tension spring (13), and the two ends of the tension spring (13) are fixed to the opposite sides of the insert (10) and the first movable frame (7), respectively.
3. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 1, characterized in that: The first power assembly includes a first electric push rod (8) fixed at the bottom of one side of the first movable frame (7). A trapezoidal block (9) is fixedly connected to the movable end of the first electric push rod (8). A clearance hole (14) is provided through the top of the insert (10), and the trapezoidal block (9) can be inserted into the clearance hole (14).
4. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 1, characterized in that: The second elastic component is a spring (21), and the two ends of the spring (21) are fixed to the opposite sides of the card holder (20) and the second sliding hole (22), respectively.
5. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 1, characterized in that: The second power assembly includes a second electric push rod (17) fixed to the top of one side of the first movable frame (7). The moving end of the second electric push rod (17) is fixedly connected to the extrusion frame (19), and the inclined surface of the extrusion frame (19) is in contact with the card holder (20).
6. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 5, characterized in that: Multiple mounting slots are provided on the opposite sides of the two card holders (20), and rollers (23) are tumbling connected in the mounting slots.
7. A multi-stage hydraulic cylinder with a mechanical locking mechanism according to claim 1, characterized in that: The first piston (2) is fixedly connected to both sides by a fixing rod (4), and the bottom of the fixing rod (4) is fixedly connected to a limiting ring (5) that is fixed to the first moving frame (7). One side of the limiting ring (5) is a notch.