CN-224201226-U - Limiting device of pneumatic actuator

Abstract

The utility model discloses a limiting device of a pneumatic actuator, which belongs to the technical field of pneumatic actuators and comprises a pneumatic actuator body, a shell, a rotating shaft for controlling the rotation of a valve, a buffer component for slowing down the inertia generated by the over-fast rotation of the rotating shaft, a mounting plate, a limiting component and a limiting plate, wherein the rotating shaft is arranged in the shell, the buffer component is arranged on the outer side of the rotating shaft, the top of the mounting plate is provided with the limiting component for positioning the rotating shaft, the buffer component comprises a mounting frame which is arranged on the inner side of the shell, the mounting frame is hollow, and limiting plates are symmetrically arranged in the mounting frame up and down.

Inventors

• XU JING
• ZHANG YING
• XIAO LI

Assignees

• 无锡市诚天诺执行器制造有限公司

Dates

Publication Date

20260505

Application Date

20250429

Claims (2)

1. 1. A limiting device of a pneumatic actuator is characterized by comprising A pneumatic actuator body (1); The pneumatic actuator comprises a shell (2), wherein the shell is arranged on one side of a pneumatic actuator body (1), a rotating shaft (4) for controlling the valve to turn is arranged in the shell (2), a buffer component (3) for slowing down inertia generated by the too fast turning of the rotating shaft (4) is arranged on the inner side end surface of the shell (2), the buffer component (3) comprises a mounting frame (31) arranged on the inner side end surface of the shell (2), the mounting frame (31) is hollow, limiting plates (33) are symmetrically arranged in the mounting frame (31) up and down, racks (32) are connected in the limiting plates (33) in a sliding manner, buffer columns (34) are arranged in the racks (32) in a penetrating manner, both ends of the buffer columns (34) extend out of the outer sides of the racks (32), and protective frames (35) are arranged at both ends of the buffer columns (34); Mounting panel (6), set up in the axis of rotation (4) outside, mounting panel (6) top is provided with and is used for carrying out the spacing subassembly of location to axis of rotation (4), spacing subassembly is including setting up mounting panel (6) in the axis of rotation (4) outside, mounting panel (6) top symmetry has seted up mounting groove (7), singly be provided with second spring (8) in mounting groove (7), the end of second spring (8) is provided with spacing ball (9), the axis of rotation (4) outside is provided with gear (5), and gear (5) are connected with rack (32) meshing, the draw-in groove corresponding with spacing ball (9) has been seted up to gear (5) bottom.
2. 2. The limit device of the pneumatic actuator of claim 1, wherein a single protective frame (35) is arranged in the mounting frame (31), a first spring (36) is arranged in the protective frame (35), the tail end of the first spring (36) is connected with a bearing frame (37), and a buffer groove (38) is formed in one side, facing the buffer column (34), of the bearing frame (37).

Description

Limiting device of pneumatic actuator Technical Field The utility model belongs to the technical field of pneumatic actuators, and particularly relates to a limiting device of a pneumatic actuator. Background The pneumatic actuator is a device which uses compressed air as a power source to convert air pressure energy into mechanical motion, is widely applied to the fields of industrial automation, process control and the like, and is used for controlling the actions of equipment such as valves, mechanical arms and the like by driving mechanical parts (such as pistons or gears) to generate linear or rotary motion through the compressed air. In the field of industrial valve control, pneumatic actuators are widely used because of their advantages of fast response speed, high safety, etc., and the pneumatic actuators are opened and closed or flow-rate-adjustable by driving the rotary motion of a valve shaft. However, during the opening or closing process of the valve, the actual rotation angle is easily deviated from the set value due to the self-inertia effect of the rotating shaft and the connecting parts (such as the valve plate and the gear), and the control precision and the system reliability are seriously affected. The following are specific drawbacks of the prior art: When the pneumatic actuator drives the valve spindle to a target angle, the conventional mechanical limiting device, such as a fixed stop block, can limit the stroke of the spindle through rigid blocking, but when the high-speed motion or the load inertia is large, the spindle can generate an overshoot phenomenon or rebound phenomenon due to the inertia, so that the valve cannot accurately stay at a preset angle. For example, in a quick closing of an emergency shut-off valve, overshoot may cause the sealing surface to strike damage, while rebound may result in the valve not being fully closed, risking leakage. The utility model aims to provide a limiting device of a pneumatic actuator, which aims to solve the problems in the prior art. Disclosure of utility model The utility model aims to provide a limiting device of a pneumatic actuator, which aims to solve the problems in the prior art. The limiting device of the pneumatic actuator comprises a pneumatic actuator body, a shell and a limiting assembly, wherein the shell is arranged on one side of the pneumatic actuator body, a rotating shaft for controlling the valve to turn is arranged in the shell, a buffering assembly for reducing inertia generated by the fact that the rotating shaft turns too fast is arranged on the inner side end face of the shell, the buffering assembly comprises a mounting frame arranged on the inner side end face of the shell, the mounting frame is hollow, limiting plates are symmetrically arranged in the mounting frame up and down, racks are connected in the limiting plates in a sliding mode, a buffering column penetrates through the racks, two ends of the buffering column extend out of the racks, protective frames are arranged at two ends of the buffering column, the mounting plate is arranged on the outer side of the rotating shaft, a limiting assembly for positioning the rotating shaft is arranged at the top of the mounting plate, the limiting assembly comprises a mounting plate arranged on the outer side of the rotating shaft, mounting grooves are symmetrically arranged at the top of the mounting plate, second springs are arranged in the mounting grooves, limiting balls are arranged at the tail ends of the second springs, gears are arranged on the outer side of the rotating shaft, and are connected with the gears in a clamping mode, and the bottoms of the gears are correspondingly meshed with the corresponding limiting balls. Further, a single protection frame is arranged in the installation frame, a first spring is arranged in the protection frame, the tail end of the first spring is connected with a bearing frame, and a buffer groove is formed in one side, facing the buffer column, of the bearing frame. Compared with the prior art, the utility model has the following beneficial effects: 1. According to the utility model, the buffer assembly is arranged, when the rotating shaft rotates at the control valve, the valve is opened, and then the inertia of the rotating shaft is buffered through the bearing frame and the first spring, so that the self inertia of the rotating shaft during rotation can be effectively slowed down, and the change of the opening angle of the valve is prevented. 2. According to the utility model, the limiting assembly is arranged and matched with the buffer assembly, the valve can be opened and closed every 180 degrees of rotation of the gear, and the limiting ball is matched with the clamping groove at the bottom of the gear, so that the gear can be effectively controlled, and the rotation of the rotating shaft can be immediately stopped after the gear is further controlled to rotate 180 degrees, and the opening angle of the valve canno