Locking device for valve actuating arm

Abstract

The utility model relates to a locking device for a valve actuating arm, which is mounted on an actuating arm mounting plate and is characterized in that the locking device comprises a hydraulic cylinder, the hydraulic cylinder is connected onto the actuating arm mounting plate through a flange support, a mounting hole is arranged on the actuating arm mounting plate corresponding to the center of a cylinder rod of the hydraulic cylinder, and the hydraulic cylinder is connected with the actuating arm mounting plate through a flange support. The locking device is characterized in that a locking extension rod with the outer diameter larger than that of a hydraulic cylinder lever is installed in the installation hole and extends towards the driving arm side, and a locking groove is formed in the driving arm; and the locking extension rod on the hydraulic cylinder side is connected with a hydraulic cylinder lever in a sliding manner. The stability, durability, flexibility and operation accuracy of the locking device are remarkably improved, and a powerful guarantee is provided for reliable locking of the valve driving arm.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a locking device for valve drive arms. Background Technology

[0002] In valve control systems, ensuring that valves are precisely maintained in fully open, fully closed, or specific intermediate positions is crucial for preventing misoperation and maintaining system safety. To achieve this, locking devices are designed to effectively limit and fix the drive arm of the valve actuation assembly, thereby reliably preventing any unintended movement of the valve's pressure control components. Especially when hydraulic locking is employed, the hydraulic cylinder rod, as a key component directly acting on the drive arm to achieve locking, directly impacts the reliability of the entire locking mechanism.

[0003] However, traditional hydraulic locking solutions face a significant challenge: when directly subjected to radial forces, the hydraulic cylinder rod is highly susceptible to deformation due to excessive mechanical load. This not only damages the internal sealing devices of the hydraulic cylinder, leading to hydraulic oil leakage, but can also cause irreversible damage to the entire hydraulic system in severe cases. To counteract the negative effects of these radial forces, it is often necessary to increase the diameter of the hydraulic cylinder rod to enhance its structural strength and withstand greater stress. However, this approach undoubtedly increases manufacturing costs significantly and may also adversely affect the compactness and efficiency of the hydraulic system.

[0004] In view of the above problems, this utility model proposes an innovative locking device for valve drive arms. This device, through ingenious design, protects the hydraulic cylinder rod from direct impact of radial forces without significantly increasing the rod diameter, thereby ensuring locking effectiveness while effectively controlling costs and improving the overall stability and durability of the system. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model provides a locking device for valve drive arms.

[0006] This utility model is implemented as follows: a locking device for a valve drive arm, the locking device being mounted on a drive arm mounting plate, characterized in that: the locking device includes a hydraulic cylinder, the hydraulic cylinder being connected to the drive arm mounting plate via a flange bracket, and the drive arm mounting plate having a mounting hole corresponding to the center of the hydraulic cylinder rod; characterized in that: a locking extension rod with an outer diameter larger than the outer diameter of the hydraulic cylinder lever is installed in the mounting hole and extends towards the drive arm side, the drive arm having a locking groove; and the locking extension rod is slidably connected to the hydraulic cylinder lever on the hydraulic cylinder side.

[0007] More preferably, a wear-resistant sleeve is installed inside the mounting hole.

[0008] More preferably, the locking extension rod has a central insertion hole, into which the hydraulic cylinder lever is inserted and slides; an annular groove is provided on the hydraulic cylinder rod near the locking extension rod, and a connecting ring is provided in the annular groove. The thickness of the connecting ring is less than the width of the annular groove, and the thickness difference between the connecting ring and the annular groove is the distance the hydraulic cylinder lever slides relative to the locking extension rod; the connecting ring is formed by two semi-circular connecting bodies, which are fixedly installed on the end face of the locking extension rod by fasteners.

[0009] The advantages and technical effects of this utility model are as follows: The valve drive arm locking device provided by this utility model achieves excellent technical effects through a series of optimized designs. First, the device is firmly installed on the drive arm mounting plate, ensuring precise locking and unlocking operations. The hydraulic cylinder provides stable thrust, and the flange connection enhances structural strength and facilitates maintenance. The sliding connection between the locking extension rod and the hydraulic cylinder lever, combined with the use of wear-resistant sleeves, significantly reduces friction and wear, extending service life. In particular, the design of the locking extension rod not only enhances locking stability but also improves radial load-bearing capacity and reduces stress concentration. Furthermore, the cooperation between the insertion hole, the annular groove, and the connecting ring provides displacement space for the hydraulic cylinder lever, effectively absorbing radial force, preventing bending, and enhancing the stability of the device. At the same time, the split design of the connecting ring facilitates installation and disassembly, reduces friction during the push-pull process, and ensures efficient and uniform force transmission. In summary, this utility model significantly improves the stability, durability, flexibility, and operational precision of the locking device, providing a strong guarantee for reliable locking of the valve drive arm. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model;

[0011] Figure 2 This is an exploded perspective view of the present invention;

[0012] Figure 3 This is a schematic diagram of the locking and unlocking structure.

[0013] In the diagram: 1. Locking device; 1-1. Hydraulic cylinder; 1-2. Hydraulic cylinder rod; 1-3. Locking extension rod; 1-30. Insertion hole; 1-4. Wear-resistant sleeve; 1-5. Connecting ring; 2. Drive arm mounting plate; 2-1. Mounting hole; 3. Drive arm; 3-1. Locking groove; 4. Flange bracket. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0015] Please see Figures 1 to 3 A locking device for a valve drive arm, the locking device 1 being mounted on a drive arm mounting plate 2, ensures that the locking device can be stably fixed to the drive arm mounting plate, providing a solid foundation for subsequent locking operations. It fixes the relative position between the locking device and the drive arm, facilitating precise locking and unlocking operations.

[0016] The locking device includes a hydraulic cylinder 1-1, which provides stable and controllable thrust or pull force for extending and retracting the locking extension rod. The hydraulic cylinder is connected to the drive arm mounting plate via a flange bracket 4. The flange connection is a robust and reliable method, ensuring the connection strength between the hydraulic cylinder and the drive arm mounting plate. Simultaneously, the flange connection facilitates the installation and disassembly of the hydraulic cylinder, aiding in equipment maintenance and replacement. The drive arm mounting plate has a mounting hole 2-1 corresponding to the center of the hydraulic cylinder rod 1-2. This feature ensures that the locking extension rod can be accurately aligned with the hydraulic cylinder rod and allows the locking extension rod to slide freely within the mounting hole. This design helps reduce friction and wear, improving the durability of the locking device. A locking extension rod 1-3 is installed within the mounting hole and extends towards the drive arm 3. The outer diameter of the locking extension rod 1-3 is larger than the outer diameter of the hydraulic cylinder lever; extending it towards the drive arm achieves multiple technical benefits. First, this design significantly enhances the stability of the lock, as the larger contact area increases friction during locking, effectively preventing accidental movement of the valve drive arm. Secondly, it improves the radial load-bearing capacity of the locking device, enabling it to better resist external radial forces and protect the hydraulic cylinder rod from damage, thereby extending the service life of the entire locking device. The increased outer diameter of the locking extension rod makes the force transmitted from the hydraulic cylinder lever to the drive arm more evenly and dispersed. This design helps reduce stress concentration, lowering the risk of damage to the locking device due to stress concentration during long-term use. The drive arm is provided with a locking groove 3-1; the locking extension rod is slidably connected to the hydraulic cylinder lever 1-2 on the hydraulic cylinder side. This sliding connection allows the locking extension rod to extend or retract freely under the push of the hydraulic cylinder lever, achieving flexible operation of the locking device. Simultaneously, the sliding connection reduces friction and wear between the locking extension rod and the hydraulic cylinder lever, improving the service life of the locking device and also providing a certain buffering effect.

[0017] More preferably, wear-resistant sleeves 1-4 are installed inside the mounting hole. The main function of the wear-resistant sleeve is to enhance the wear resistance of the part in which it is located. In the locking device of the valve drive arm, installing a wear-resistant sleeve can effectively reduce wear caused by frequent friction, thereby extending the service life of the locking device. The wear-resistant sleeve is usually made of materials with excellent wear resistance, such as certain special alloys or composite materials. These materials can withstand high friction and wear, maintaining the stability and reliability of the locking device.

[0018] Further preferably, the locking extension rod has a central insertion hole 1-30, into which the hydraulic cylinder lever is inserted and slides. Near the locking extension rod, the hydraulic cylinder rod has an annular groove 1-20, within which a connecting ring 1-5 is located. The thickness of the connecting ring is less than the width of the annular groove, and the thickness difference between the connecting ring and the annular groove is the distance the hydraulic cylinder lever slides relative to the locking extension rod. The connecting ring is formed by two semi-circular connecting bodies, which are fixedly mounted on the end face of the locking extension rod using fasteners. This significantly improves the flexibility and durability of the locking device. First, the insertion hole design at the center of the locking extension rod allows the hydraulic cylinder lever to slide smoothly and tightly within it, ensuring precise and rapid locking action. The cooperation between the annular groove and the connecting ring not only provides a certain displacement space for the hydraulic cylinder lever but also effectively absorbs the radial force on the locking extension rod, preventing the hydraulic cylinder rod from bending due to force, greatly enhancing the stability and reliability of the entire locking device.

[0019] Furthermore, the connecting ring is formed by two semi-circular connecting bodies and is fixed to the end face of the locking extension rod with fasteners. This design not only facilitates installation and disassembly but also ensures a smooth connection of the end faces, reducing friction and wear during the pushing and pulling process. When the hydraulic cylinder pushes the locking extension rod, the two can make direct contact, resulting in more direct and efficient force transmission. When the hydraulic cylinder pulls back the locking extension rod, it is achieved by pulling the locking block. This design ensures effective transmission of pulling force and avoids stress concentration caused by direct pulling, further extending the service life of the locking device.

[0020] The above description is only a preferred embodiment of the present utility model and is 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 locking device for a valve drive arm, the locking device being mounted on a drive arm mounting plate, characterized in that: The locking device includes a hydraulic cylinder, which is connected to a drive arm mounting plate via a flange bracket. The drive arm mounting plate has a mounting hole corresponding to the center of the hydraulic cylinder rod. The locking extension rod with an outer diameter larger than the outer diameter of the hydraulic cylinder lever is installed in the mounting hole and extends towards the drive arm. The drive arm has a locking groove. The locking extension rod is slidably connected to the hydraulic cylinder lever on the hydraulic cylinder side.

2. The locking device for a valve drive arm according to claim 1, characterized in that: A wear-resistant sleeve is installed inside the mounting hole.

3. The locking device for a valve drive arm according to claim 1, characterized in that: The locking extension rod has a central insertion hole, into which the hydraulic cylinder lever is inserted and slides. Near the locking extension rod, the hydraulic cylinder rod has an annular groove, within which a connecting ring is located. The thickness of the connecting ring is less than the width of the annular groove, and the thickness difference between the connecting ring and the annular groove is the distance the hydraulic cylinder lever slides relative to the locking extension rod. The connecting ring is formed by two semi-circular connecting bodies, which are fixedly mounted on the end face of the locking extension rod using fasteners.

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