Hydraulic cylinder with self-locking function

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with a self-locking function, which comprises a cylinder body and a piston rod slidably connected in the cylinder body, a mounting barrel slidably connected to the outer wall of the piston rod is arranged at the end of the cylinder body, and a mounting seat is fixedly connected to the outer wall of the mounting barrel. A sliding groove with the axis coinciding is formed in the outer wall of the mounting cylinder and the outer wall of the mounting base in a penetrating mode, a locking rod is slidably connected into the sliding groove, and when a locking hole and the locking rod are aligned, a pressing plate moves with a hinged support as the center under the elastic force of a spring, so that a clamping ball is driven to move downwards, the clamping ball is located in an embedding groove, and therefore the locking rod is pushed downwards; when locking needs to be relieved, the pressing plate is pressed downwards, the pressing plate drives the clamping ball to upwards lift the locking rod, the locking rod moves out of the locking hole, self-locking is relieved, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a hydraulic cylinder with a self-locking function. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, performing linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is directly proportional to the effective area of ​​the piston and the pressure difference between its two sides. A hydraulic cylinder basically consists of a cylinder barrel and cylinder head, a piston and piston rod, a sealing device, a cushioning device, and a venting device. The cushioning device and venting device are optional depending on the specific application; the other devices are essential.

[0003] Existing hydraulic cylinders lack self-locking functionality. When operating, these cylinders bear significant weight, and malfunctions can cause the cylinder's extension rod to be forced back into the cylinder by gravity, posing a safety hazard. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic cylinder with a self-locking function, which is easy to lock the piston rod, has a simple structure, is easy to operate, and improves safety.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a hydraulic cylinder with a self-locking function, comprising a cylinder body and a piston rod slidably connected to the inside of the cylinder body, an installation cylinder slidably connected to the outer wall of the piston rod at the end of the cylinder body, an installation seat fixedly connected to the outer wall of the installation cylinder, a sliding groove with the same axis extending through the outer walls of the installation cylinder and the installation seat, a locking rod slidably connected inside the sliding groove, a locking hole matching the locking rod being opened on one side of the outer wall of the piston rod, an embedding groove being opened on the outer side wall of the locking rod, a pressure plate being movably connected to the upper end face of the installation seat through a hinge, a retaining ball being fixedly connected to one end of the pressure plate through a connecting rod, and the retaining ball extending into the interior of the embedding groove.

[0006] To facilitate the reset of the pressure plate, a spring is preferably provided between the mounting base and the pressure plate in a preferred embodiment of the self-locking hydraulic cylinder of this utility model.

[0007] For ease of guidance and positioning, the bottom end of the locking rod of the preferred hydraulic cylinder with self-locking function of this utility model is tapered.

[0008] To reduce friction between the piston rod and the mounting cylinder, a preferred embodiment of the self-locking hydraulic cylinder of this invention features a sliding sleeve fixedly connected to the inner wall of the mounting cylinder.

[0009] To facilitate the disassembly and assembly of the mounting cylinder, as a preferred embodiment of the self-locking hydraulic cylinder of this utility model, two mounting blocks are fixedly connected to the outer wall of the mounting cylinder, and the two mounting blocks are detachably connected to the cylinder body by fixing bolts.

[0010] For greater flexibility, in a preferred embodiment of the self-locking hydraulic cylinder of this invention, the number of locking holes is one or more.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] When the piston rod is not extended, the locking rod abuts against the outer wall of the piston rod, and the spring is also compressed. As the piston rod extends outward, the locking hole on the outside of the piston rod moves toward the locking rod. When the locking hole and the locking rod are aligned, the spring force causes the pressure plate to move around the hinge, thereby moving the ball downward. The ball is located inside the groove, which pushes the locking rod downward, causing it to engage with the locking hole and lock the piston rod, thus stabilizing the operation of the hydraulic cylinder. To release the lock, the pressure plate is pressed down, and the pressure plate moves the ball upward to lift the locking rod, causing it to move out of the locking hole and thus releasing the self-locking mechanism. The structure is simple and the operation is convenient. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0014] Figure 2 This is a diagram of the overall external structure of this utility model.

[0015] In the diagram: 1. Cylinder block; 2. Piston rod; 3. Mounting cylinder; 4. Mounting seat; 5. Slide groove; 6. Locking rod; 7. Embedded groove; 8. Hinge seat; 9. Pressure plate; 10. Connecting rod; 11. Ball bearing; 12. Locking hole; 13. Spring; 14. Mounting block; 15. Fixing bolt. Detailed Implementation

[0016] Please see Figures 1 to 2 A self-locking hydraulic cylinder includes a cylinder body 1 and a piston rod 2 slidably connected inside the cylinder body 1. The end of the cylinder body 1 is provided with a mounting cylinder 3 slidably connected to the outer wall of the piston rod 2. The outer wall of the mounting cylinder 3 is fixedly connected to a mounting seat 4. The outer walls of the mounting cylinder 3 and the mounting seat 4 are provided with a sliding groove 5 with the same axis. A locking rod 6 is slidably connected inside the sliding groove 5. A locking hole 12 matching the locking rod 6 is provided on one side of the outer wall of the piston rod 2. An embedding groove 7 is provided on the outer side wall of the locking rod 6. A pressure plate 9 is movably connected to the upper end face of the mounting seat 4 through a hinge 8. One end of the pressure plate 9 is fixedly connected to a ball bearing 11 through a connecting rod 10. The ball bearing 11 extends into the interior of the embedding groove 7.

[0017] In this embodiment: when the piston rod 2 is not extended, the locking rod 6 abuts against the outer wall of the piston rod 2. At this time, the spring 13 is also in a compressed state. Then, as the piston rod 2 extends outward, the locking hole 12 outside the piston rod 2 moves toward the locking rod 6. When the locking hole 12 and the locking rod 6 are aligned, the pressure plate 9 moves around the hinge 8 under the elastic force of the spring 13, thereby driving the ball 11 to move downward. The ball 11 is located inside the embedding groove 7, thereby pushing the locking rod 6 downward, so that the locking rod 6 is locked into the locking hole 12, thereby locking the piston rod 2 and making the hydraulic cylinder run stably. When it is necessary to release the lock, the pressure plate 9 is pressed down, and the pressure plate 9 drives the ball 11 to lift the locking rod 6 upward, so that the locking rod 6 moves out of the locking hole 12, thereby releasing the self-lock. The structure is simple and the operation is convenient.

[0018] As a technical optimization of this utility model, a spring 13 is provided between the mounting base 4 and the pressure plate 9.

[0019] In this embodiment, a spring 13 is provided between the mounting base 4 and the pressure plate 9 to facilitate the resetting of the pressure plate 9.

[0020] As a technical optimization of this utility model, the bottom end of the locking rod 6 is a tapered structure.

[0021] In this embodiment, the bottom end of the locking rod 6 is a tapered structure, which makes it easier to guide and position the locking rod 6.

[0022] As a technical optimization of this utility model, a sliding sleeve is fixedly connected to the inner wall of the mounting cylinder 3.

[0023] In this embodiment, a sliding sleeve is fixedly connected to the inner wall of the mounting cylinder 3 to reduce the friction between the mounting cylinder 3 and the piston rod 2.

[0024] As a technical optimization of this utility model, two mounting blocks 14 are fixedly connected to the outer wall of the mounting cylinder 3, and the two mounting blocks 14 are detachably connected to the cylinder body 1 by fixing bolts 15.

[0025] In this embodiment, the mounting block 14 is detachably connected to the cylinder body 1 by fixing bolts 15, which facilitates the disassembly and assembly of the mounting cylinder 3.

[0026] As a technical optimization of this utility model, the number of locking holes 12 is one or more.

[0027] In this embodiment, the number of locking holes 12 is one or more. If multiple locking holes 12 are provided, the spacing between two adjacent locking holes 12 is not limited. The holes are made according to the actual usage scenario and requirements.

[0028] Working principle: When the piston rod 2 is not extended, the locking rod 6 abuts against the outer wall of the piston rod 2. At this time, the spring 13 is also in a compressed state. Then, as the piston rod 2 extends outward, the locking hole 12 outside the piston rod 2 moves toward the locking rod 6. When the locking hole 12 and the locking rod 6 are aligned, the pressure plate 9 moves around the hinge 8 under the elastic force of the spring 13, thereby driving the ball 11 to move downward. The ball 11 is located inside the embedded groove 7, thereby pushing the locking rod 6 downward, so that the locking rod 6 is locked into the locking hole 12, thereby locking the piston rod 2 and making the hydraulic cylinder run stably. When it is necessary to release the lock, press the pressure plate 9 downward. The pressure plate 9 drives the ball 11 to lift the locking rod 6 upward, so that the locking rod 6 moves out of the locking hole 12, thereby releasing the self-lock. The structure is simple and the operation is convenient.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A hydraulic cylinder with a self-locking function, comprising a cylinder body (1) and a piston rod (2) slidably connected inside the cylinder body (1), characterized in that: The cylinder (1) is provided with an installation cylinder (3) that is slidably connected to the outer wall of the piston rod (2). The outer wall of the installation cylinder (3) is fixedly connected to an installation seat (4). The outer walls of the installation cylinder (3) and the installation seat (4) are provided with a sliding groove (5) with the axis of the same direction. A locking rod (6) is slidably connected inside the sliding groove (5). A locking hole (12) matching the locking rod (6) is provided on one side of the outer wall of the piston rod (2). An embedding groove (7) is provided on the outer side wall of the locking rod (6). A pressure plate (9) is movably connected to the upper end face of the installation seat (4) through a hinge (8). One end of the pressure plate (9) is fixedly connected to a ball (11) through a connecting rod (10). The ball (11) extends into the interior of the embedding groove (7).

2. A hydraulic cylinder with a self-locking function according to claim 1, characterized in that: A spring (13) is provided between the mounting base (4) and the pressure plate (9).

3. A hydraulic cylinder with a self-locking function according to claim 1, characterized in that: The bottom end of the locking rod (6) has a tapered structure.

4. A hydraulic cylinder with a self-locking function according to claim 1, characterized in that: The inner wall of the mounting cylinder (3) is fixedly connected to a sliding sleeve.

5. A hydraulic cylinder with a self-locking function according to claim 1, characterized in that: Two mounting blocks (14) are fixedly connected to the outer wall of the mounting cylinder (3), and the two mounting blocks (14) are detachably connected to the cylinder body (1) by fixing bolts (15).

6. A hydraulic cylinder with a self-locking function according to claim 1, characterized in that: The number of locking holes (12) is one or more.

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