Hydraulic oil cylinder locking mechanism

Abstract

The utility model relates to a hydraulic oil cylinder locking mechanism, and belongs to the field of aerial vehicles. The hydraulic cylinder comprises a cylinder body, a piston rod and a piston, the piston is fixed at one end of the piston rod and located in the cylinder body, the interior of the cylinder body is divided into a small cavity and a large cavity by the piston, the hydraulic cylinder is structurally characterized by further comprising a spring and a hydraulic lock, the piston rod is sleeved with the spring, the spring is located in the small cavity, and the hydraulic lock is located in the large cavity. The two ends of the spring abut against the end of the piston and the end of the small cavity respectively, the hydraulic lock is arranged on the cylinder body, a first hydraulic lock oil port and a second hydraulic lock oil port are formed in the hydraulic lock, a damping hole is formed in the second hydraulic lock oil port, the large cavity is communicated with the second hydraulic lock oil port, and the small cavity is communicated with the first hydraulic lock oil port.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder locking mechanism, belonging to the field of aerial work platforms. Background Technology

[0002] On aerial work platforms, to prevent the outrigger cylinders from falling after retraction, some solutions add hydraulic locks to the cylinders. However, hydraulic locks can leak, and over time, the outrigger cylinders may also sag. Some solutions use spring-loaded piston cylinders to hold the cylinder in place by spring force (application number CN202323366821.0), but the springs can also fatigue after prolonged use, leading to sag. Furthermore, when the piston cylinder extends, the force-bearing area is limited to the piston rod area, resulting in insufficient extension force. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned deficiencies in the existing technology and to provide a hydraulic cylinder locking mechanism with a reasonable structural design.

[0004] The technical solution adopted by this utility model to solve the above problems is as follows: The hydraulic cylinder locking mechanism includes a cylinder body, a piston rod, and a piston. The piston is fixed at one end of the piston rod and is located inside the cylinder body. The piston divides the cylinder body into a small cavity and a large cavity. Its structural features are: it also includes a spring and a hydraulic lock. The spring is sleeved outside the piston rod and is located inside the small cavity. The two ends of the spring abut against the ends of the piston and the small cavity, respectively. The hydraulic lock is set on the cylinder body. The hydraulic lock is provided with a first hydraulic lock port and a second hydraulic lock port. The second hydraulic lock port is provided with a damping hole. The large cavity is connected to the second hydraulic lock port, and the small cavity is connected to the first hydraulic lock port.

[0005] Furthermore, it also includes a connecting block, which is disposed on the cylinder body, and the hydraulic lock is disposed on the connecting block.

[0006] Furthermore, the large cavity is connected to the second hydraulic lock port via a first rigid pipe and a connecting block, and the small cavity is connected to the first hydraulic lock port via a second rigid pipe and a connecting block.

[0007] Furthermore, the hydraulic lock is mounted to the connecting block via mounting bolts.

[0008] Furthermore, the connecting block is welded to the cylinder body.

[0009] Compared with the prior art, the present invention has the following advantages: the hydraulic cylinder adopts the dual protection of hydraulic lock and spring, which can better prevent the cylinder from falling; compared with the plunger spring cylinder, the hydraulic cylinder has a larger force-bearing area in the large cavity and a greater extension force. Attached Figure Description

[0010] Figure 1This is a schematic diagram of the main structure of the hydraulic cylinder locking mechanism according to an embodiment of the present invention.

[0011] Figure 2 This is a top view schematic diagram of the hydraulic cylinder locking mechanism according to an embodiment of the present invention.

[0012] Figure 3 This is a schematic diagram of the hydraulic cylinder locking mechanism according to an embodiment of the present invention.

[0013] In the diagram: 1. Cylinder body; 2. Small chamber; 3. Spring; 4. Piston rod; 5. Large chamber; 6. No. 1 rigid pipe; 7. Hydraulic lock; 8. Connecting block; 9. No. 2 rigid pipe; 10. Damping hole; 11. Mounting bolt; 12. No. 1 hydraulic lock oil port; 13. No. 2 hydraulic lock oil port; 14. Piston. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0015] Example

[0016] See Figures 1 to 3 As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0017] The hydraulic cylinder locking mechanism in this embodiment includes a cylinder body 1, a spring 3, a piston rod 4, a hydraulic lock 7, a connecting block 8, and a piston 14. The piston 14 is fixed to one end of the piston rod 4 and is located inside the cylinder body 1. The piston 14 divides the inside of the cylinder body 1 into a small chamber 2 and a large chamber 5.

[0018] In this embodiment, the spring 3 is fitted outside the piston rod 4 and is located inside the small cavity 2. The two ends of the spring 3 abut against the piston 14 and the end of the small cavity 2, respectively. The hydraulic lock 7 is set on the cylinder body 1, that is, the connecting block 8 is set on the cylinder body 1. Normally, the connecting block 8 is welded to the cylinder body 1. The hydraulic lock 7 is set on the connecting block 8. Normally, the hydraulic lock 7 is installed on the connecting block 8 by the mounting bolt 11.

[0019] In this embodiment, the hydraulic lock 7 is provided with a first hydraulic lock port 12 and a second hydraulic lock port 13. The second hydraulic lock port 13 is provided with a damping hole 10. The large cavity 5 is connected to the second hydraulic lock port 13, and the small cavity 2 is connected to the first hydraulic lock port 12. That is to say, the large cavity 5 is connected to the second hydraulic lock port 13 through the first rigid pipe 6 and the connecting block 8, and the small cavity 2 is connected to the first hydraulic lock port 12 through the second rigid pipe 9 and the connecting block 8.

[0020] Specifically, piston rod 4 is assembled with cylinder body 1, one end of first hard tube 6 is connected to large cavity 5, the other end of first hard tube 6 is connected to connecting block 8, one end of second hard tube 9 is connected to small cavity 2, the other end of second hard tube 9 is connected to connecting block 8, hydraulic lock 7 is installed to connecting block 8 by mounting bolt 11, connecting block 8 is welded to cylinder body 1, and spring 3 is pre-compressed in small cavity 2.

[0021] The large chamber 5 is connected to the second hydraulic lock port 13 via the first rigid pipe 6 and the connecting block 8. The small chamber 2 is connected to the first hydraulic lock port 12 via the second rigid pipe 9 and the connecting block 8. When the aerial work platform is working, hydraulic oil enters the large chamber 5 through the damping hole 10 and the second hydraulic lock port 13, driving the piston rod 4 to extend together. When the platform is retracted, hydraulic oil enters the small chamber 2 through the first hydraulic lock port 12 and, together with the spring force, drives the piston rod 4 to retract to the bottom. The retracted hydraulic oil flows out through the second hydraulic lock port 13 and the damping hole 10. The damping hole 10 can reduce the impact when the spring cylinder retracts. The spring 3 is normally pre-compressed in the small chamber 2. The pre-compression force can ensure that the cylinder can still be retracted to the bottom after the hydraulic lock leaks or fails. The presence of the hydraulic lock 7 can also ensure that the cylinder will not fall off after the spring 3 fails due to fatigue.

[0022] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model patent concept are included within the protection scope of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined in these claims, all of which should fall within the protection scope of this utility model.

Claims

1. A hydraulic cylinder locking mechanism, comprising a cylinder body (1), a piston rod (4), and a piston (14), wherein the piston (14) is fixed to one end of the piston rod (4) and the piston (14) is located inside the cylinder body (1), and the piston (14) divides the cylinder body (1) into a small chamber (2) and a large chamber (5), characterized in that: It also includes a spring (3) and a hydraulic lock (7). The spring (3) is fitted outside the piston rod (4) and is located inside the small cavity (2). The two ends of the spring (3) abut against the piston (14) and the end of the small cavity (2) respectively. The hydraulic lock (7) is set on the cylinder body (1). The hydraulic lock (7) is provided with a first hydraulic lock port (12) and a second hydraulic lock port (13). The second hydraulic lock port (13) is provided with a damping hole (10). The large cavity (5) is connected to the second hydraulic lock port (13). The small cavity (2) is connected to the first hydraulic lock port (12).

2. The hydraulic cylinder locking mechanism according to claim 1, characterized in that: It also includes a connecting block (8), which is disposed on the cylinder body (1), and the hydraulic lock (7) is disposed on the connecting block (8).

3. The hydraulic cylinder locking mechanism according to claim 1, characterized in that: The large cavity (5) is connected to the second hydraulic lock port (13) through the first hard pipe (6) and the connecting block (8), and the small cavity (2) is connected to the first hydraulic lock port (12) through the second hard pipe (9) and the connecting block (8).

4. The hydraulic cylinder locking mechanism according to claim 2, characterized in that: The hydraulic lock (7) is installed to the connecting block (8) by mounting bolts (11).

5. The hydraulic cylinder locking mechanism according to claim 2, characterized in that: The connecting block (8) is welded to the cylinder (1).

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