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 and a rotating shaft which is arranged on one side of the pneumatic actuator body and is used for controlling steering of a valve. A buffering assembly used for relieving inertia generated by too fast steering of the rotating shaft is arranged on the side end face of the interior of the shell, the mounting plate is arranged on the outer side of the rotating shaft, a limiting assembly used for positioning the rotating shaft is arranged at the top of the mounting plate, and the buffering assembly comprises a hollow mounting frame arranged on the side end face of the interior of the shell; the device has the beneficial effects that by arranging the buffer assembly, when the rotating shaft controls the valve to rotate, after the valve is opened, the inertia of rotation of the rotating shaft is buffered through the bearing frame and the first spring, and the inertia of the rotating shaft during rotation can be effectively relieved; and the opening angle of the valve is prevented from changing.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic actuator technology, and in particular, a limiting device for a pneumatic actuator. Background Technology

[0002] A pneumatic actuator is a device that uses compressed air as a power source to convert pneumatic pressure energy into mechanical motion. It is widely used in industrial automation, process control, and other fields. It drives mechanical components (such as pistons or gears) to produce linear or rotary motion through compressed air, and is used to control the movements of equipment such as valves and robotic arms. In the field of industrial valve control, pneumatic actuators are widely used due to their advantages such as fast response speed and high safety. They achieve opening and closing or flow regulation by driving the rotation of the valve shaft.

[0003] However, during valve opening or closing, the inertia of the rotating shaft and its connecting components (such as valve plates and gears) can easily cause the actual rotation angle to deviate from the set value. This problem seriously affects control accuracy and system reliability. The following are specific defects in the existing technology:

[0004] When a pneumatic actuator drives a valve shaft to the target angle, traditional mechanical limiting devices, such as fixed stops, can limit the shaft's travel through rigid blocking. However, at high speeds or under heavy loads, the shaft may overshoot or spring back due to inertia, preventing the valve from accurately stopping at the preset angle. For example, in the rapid closing of an emergency shut-off valve, overshoot may cause impact damage to the sealing surface, while springback can result in the valve not closing completely, posing a risk of leakage.

[0005] The purpose of this invention is to provide a limiting device for a pneumatic actuator to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a limiting device for a pneumatic actuator to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a limiting device for a pneumatic actuator, comprising a pneumatic actuator body and a housing, disposed on one side of the pneumatic actuator body. A rotating shaft for controlling valve rotation is disposed within the housing. A buffer assembly for mitigating the inertia generated by excessively rapid rotation of the rotating shaft is disposed on the inner end face of the housing. The buffer assembly includes a hollow mounting frame disposed on the inner end face of the housing. Limiting plates are symmetrically arranged vertically within the mounting frame. A rack is slidably connected within the limiting plates, and a device is inserted through the rack. A buffer column is provided, with both ends of the buffer column extending outward from the rack. Each end of the buffer column is provided with a protective frame. A mounting plate is provided on the outside of the rotating shaft. A limiting component for positioning the rotating shaft is provided on the top of the mounting plate. The limiting component includes a mounting plate provided on the outside of the rotating shaft. The top of the mounting plate has symmetrically opened mounting grooves. A second spring is provided in a single mounting groove. The end of the second spring is provided with a limiting ball. A gear is provided on the outside of the rotating shaft and meshes with the rack. The bottom of the gear has a groove corresponding to the limiting ball.

[0008] Furthermore, a single protective frame is disposed within the mounting frame, and a first spring is disposed within the protective frame. The end of the first spring is connected to a bearing frame, and a buffer groove is provided on the side of the bearing frame facing the buffer post.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. By setting up a buffer component, when the rotating shaft controls the valve to rotate, the inertia of the rotating shaft after the valve opens is buffered by the bearing frame and the first spring, which can effectively reduce the inertia of the rotating shaft during rotation and prevent the valve opening angle from changing.

[0011] 2. By setting a limiting component and cooperating with a buffer component, the valve can be opened and closed every 180 degrees of gear rotation. By cooperating with the groove at the bottom of the gear, the gear can be effectively controlled, and thus the rotating shaft can be controlled to stop rotating immediately after rotating 180 degrees, so that the valve opening angle will not change due to the inertia of the rotating shaft. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

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

[0015] Figure 3 This is a schematic diagram of the mounting frame in this utility model;

[0016] Figure 4 This is a schematic diagram of the internal structure of the protective frame in this utility model;

[0017] Figure 5 This is a schematic diagram of the limiting component in this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] In the picture:

[0020] 1. Pneumatic actuator body; 2. Housing; 3. Buffer assembly; 31. Mounting frame; 32. Rack; 33. Limiting plate; 34. Buffer column; 35. Protective frame; 36. First spring; 37. Bearing frame; 38. Buffer groove; 4. Rotating shaft; 5. Gear; 6. Mounting plate; 7. Mounting groove; 8. Second spring; 9. Limiting ball. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0023] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0024] Please see Figures 1 to 5As shown, a limiting device for a pneumatic actuator includes a pneumatic actuator body 1 and a housing 2. A rotating shaft 4 for controlling valve rotation is disposed on one side of the pneumatic actuator body 1. A buffer assembly 3 for mitigating the inertia caused by excessively rapid rotation of the rotating shaft 4 is disposed on the inner side end face of the housing 2. The buffer assembly 3 includes a mounting frame 31 disposed on the inner side end face of the housing 2. The mounting frame 31 is hollow. Limiting plates 33 are symmetrically arranged vertically within the mounting frame 31. A rack 32 is slidably connected within the limiting plates 33. The limiting plates 33 limit the movement trajectory of the rack 32. A buffer post 34 is passed through the rack 32. Both ends of the buffer post 34 extend beyond the outside of the rack 32. Protective frames 35 are disposed at both ends of the buffer post 34. A single protective frame 35 is disposed within the mounting frame 31. A first spring 36 is disposed within the protective frame 35. A bearing frame 37 is connected to the end of the first spring 36. A buffer groove 38 is opened on the side of the bearing frame 37 facing the buffer post 34.

[0025] When the rotating shaft 4 rotates, the gear 5 on the outside of the rotating shaft 4 rotates along with it, thereby driving the rack 32 to move within the mounting frame 31. When the rotating shaft 4 drives the valve to the opening angle, due to inertia, the rotating shaft 4 continues to rotate forward, causing the buffer column 34 to contact the bearing frame 37 and compress the first spring 36. Then, the first spring 36 quickly restores its deformation and pushes the rack 32 back to its original position.

[0026] Mounting plate 6 is disposed on the outside of rotating shaft 4. A limiting component for positioning rotating shaft 4 is provided on the top of mounting plate 6. Gear 5 is disposed on the outside of rotating shaft 4 and meshes with rack 32. The limiting component includes mounting plate 6 disposed on the outside of rotating shaft 4. Mounting grooves 7 are symmetrically opened on the top of mounting plate 6. A second spring 8 is disposed in a single mounting groove 7. A limiting ball 9 is provided at the end of the second spring 8. A slot corresponding to the limiting ball 9 is opened at the bottom of gear 5.

[0027] Two sets of mounting slots 7 are set on both sides of the rotating shaft 4, and the two are in a straight line. The rotation of the rotating shaft 4 will not affect the mounting plate. The limit ball 9 is exposed outside the mounting slot 7 in its natural state. When the rotating shaft 4 controls the valve to open or close, it can drive the gear 5 to rotate. When the rotating shaft 4 completes one opening or closing action of the valve, that is, the gear 5 rotates 180 degrees, and then the limit ball 9 is inserted into the slot, so that the angle of the valve is fixed.

[0028] Working principle: When the valve is opened in the pneumatic actuator body 1, the rotating shaft 4 rotates, which in turn drives the gear 5 on the outside of the rotating shaft 4 to rotate. The gear 5 drives the rack 32 to move in the mounting frame 31. The rack 32 slides under the limiting plate 33 in the mounting frame 31. When the opening is completed, the inertia of the rotating shaft 4 will drive the rotating shaft 4 to continue to rotate. Then the buffer column 34 enters the buffer groove 38 in the bearing frame 37 in the protective frame 35, thereby squeezing the first spring 36. Then the first spring 36 quickly restores its deformation and pushes it back to its original position.

[0029] At the same time, the gear 5 rotates and moves into the slot above the limit ball 9. The second spring 8 at the bottom of the limit ball 9 returns to its original shape and lifts it up, thereby locking the limit ball 9 in the slot and limiting the gear 5, thus preventing the gear 5 from rotating.

[0030] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A limiting device for a pneumatic actuator, characterized in that: include Pneumatic actuator body (1); A housing (2) is provided on one side of the pneumatic actuator body (1). A rotating shaft (4) for controlling the valve rotation is provided inside the housing (2). A buffer assembly (3) for reducing the inertia generated by the rotating shaft (4) rotating too fast is provided on the inner side end face of the housing (2). The buffer assembly (3) includes a mounting frame (31) provided on the inner side end face of the housing (2). The mounting frame (31) is hollow. Limiting plates (33) are symmetrically arranged inside the mounting frame (31). A rack (32) is slidably connected inside the limiting plate (33). A buffer column (34) is provided through the rack (32). Both ends of the buffer column (34) extend out of the rack (32). A protective frame (35) is provided at both ends of the buffer column (34). Mounting plate (6) is provided on the outside of rotating shaft (4). The top of mounting plate (6) is provided with a limiting component for positioning rotating shaft (4). The limiting component includes mounting plate (6) provided on the outside of rotating shaft (4). Mounting grooves (7) are symmetrically opened on the top of mounting plate (6). A second spring (8) is provided in a single mounting groove (7). A limiting ball (9) is provided at the end of the second spring (8). A gear (5) is provided on the outside of rotating shaft (4). The gear (5) meshes with rack (32). A groove corresponding to the limiting ball (9) is opened at the bottom of the gear (5).

2. The limiting device for a pneumatic actuator according to claim 1, characterized in that: A single protective frame (35) is set inside the mounting frame (31). A first spring (36) is provided inside the protective frame (35). The end of the first spring (36) is connected to a bearing frame (37). A buffer groove (38) is provided on the side of the bearing frame (37) facing the buffer column (34).

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