Automatic buffering speed reducing mechanism applied to pneumatic actuator

Abstract

The utility model belongs to the technical field of pneumatic actuator application, and particularly discloses an automatic buffering speed reducing mechanism applied to a pneumatic actuator, which comprises a cylinder body, a main shaft, an air inlet, an air outlet, a piston, a wear-resistant ring, a piston O-shaped ring, an on-shaft wear-resistant ring, an on-shaft O-shaped ring, an under-shaft O-shaped ring, a first positioning groove, a second positioning groove, a first tooth back wear-resistant sheet and a second tooth back wear-resistant sheet, a rack on the piston makes contact with a cylindrical gear of the main shaft, and the first tooth back wear-resisting piece and the second tooth back wear-resisting piece make contact with the inner wall of the cylinder body. The utility model has the beneficial effects that: 1, the running speed of the actuator at 0 degree and 90 degrees can be changed, so that the damage of water hammer pressure to a pipeline is reduced; 2, compared with a traditional buffering mechanism, other parts do not need to be added, and the buffering mechanism of the structure can be completed only through the structural design of the first tooth back wear-resisting piece and the second tooth back wear-resisting piece; and 3, other mechanical devices are not needed, so that the cost is low, and the effect is good.

Description

Technical Field

[0001] The utility model belongs to the technical field of pneumatic actuator application, and in particular relates to an automatic buffering speed reduction mechanism applied to a pneumatic actuator. Background Art

[0002] In order to safely and quickly close (or open) valves in many chemical companies, it is necessary to open or close the valves in a very short time.

[0003] At the same time, the valve is also required to slow down at the beginning of opening or the end of closing to avoid damage to the pipeline caused by water hammer pressure and reduce damage to the valve sealing surface caused by excessive speed. Such application scenarios place higher requirements on the actuator.

[0004] Currently, the above functions are mainly achieved in the market through pneumatic control or adding other mechanical devices to the actuator, which is not only complex in structure but also costly.

[0005] Therefore, based on the above problems, the utility model provides an automatic buffering and deceleration mechanism applied to a pneumatic actuator. Utility Model Content

[0006] Purpose of the utility model: The purpose of the utility model is to provide an automatic buffering and deceleration mechanism applied to a pneumatic actuator to solve the technical problems existing in the use of the pneumatic actuator in the background technology.

[0007] Technical solution: The utility model is an automatic buffering and deceleration mechanism applied to pneumatic actuators, comprising a cylinder body, a main shaft, an air inlet and an exhaust port, wherein the cylinder body is equipped with pistons on both sides, the end face of the piston 18 is equipped with a wear-resistant ring and a piston O-ring, the main shaft is equipped with an upper wear-resistant ring, an upper O-ring and a lower O-ring, the back surface of the teeth of the piston is provided with a first positioning groove and a second positioning groove, and the first tooth back wear-resistant plate and the second tooth back wear-resistant plate are respectively installed in the first positioning groove and the second positioning groove; wherein the rack on the piston contacts the cylindrical gear of the main shaft, and the first tooth back wear-resistant plate and the second tooth back wear-resistant plate are respectively in contact with the inner wall of the cylinder body.

[0008] In the technical solution, the first tooth back wear plate and the second tooth back wear plate are respectively integrally formed injection molded parts; wherein, the contact surfaces between the first tooth back wear plate and the second tooth back wear plate and the inner wall of the cylinder body are respectively configured as inclined structures.

[0009] In the technical solution of the present invention, the first tooth back wear-resistant plate and the second tooth back wear-resistant plate are respectively arranged as arc-shaped structures.

[0010] Compared with the prior art, the automatic buffering and deceleration mechanism applied to the pneumatic actuator of the utility model has the following beneficial effects: 1. It can change the running speed of the actuator at 0° and 90°, thereby reducing the damage to the pipeline caused by water hammer pressure; 2. Compared with the traditional buffering mechanism, the buffering mechanism of this structure does not require the addition of other parts, and can be completed only through the structural design of the first tooth back wear-resistant plate and the second tooth back wear-resistant plate; 3. Because no other mechanical devices are required, the cost is low and the effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a structural schematic diagram of a cylinder body, a main shaft, an air inlet and an exhaust port of an automatic buffering and deceleration mechanism applied to a pneumatic actuator of the utility model;

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure in the middle WW direction;

[0014] Figure 3 yes Figure 1 Schematic diagram of the AA-AA structure;

[0015] Figure 4 yes Figure 3 A schematic diagram of the partially enlarged structure of the AC position in the middle;

[0016] Figure 5 It is a schematic diagram of the main structure of the first tooth back wear plate or the second tooth back wear plate of the automatic buffering and deceleration mechanism applied to the pneumatic actuator of the utility model;

[0017] Figure 6 yes Figure 5 A-direction structural schematic diagram;

[0018] Among them, the serial numbers in the figure are as follows: 10-cylinder body, 11-main shaft, 101-inlet, 102-exhaust port, 12-wear-resistant ring, 13-wear-resistant ring on the shaft, 14-first tooth back wear-resistant plate, 14-1-second tooth back wear-resistant plate, 15-O-ring on the shaft, 16-O-ring under the shaft, 17-piston O-ring, 18-piston, 19-first positioning groove, 19-1-second positioning groove. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention; the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Example

[0022] like Figures 1 to 6 The automatic buffering and deceleration mechanism for a pneumatic actuator shown in the figure comprises a cylinder body 10, a main shaft 11, an air inlet 101 and an air outlet 102.

[0023] The cylinder 10 is provided with a piston 18 on both sides.

[0024] The end face of the piston 18 is equipped with a wear-resistant ring 12 and a piston O-ring 17 (with sealing function).

[0025] The main shaft 11 is equipped with an upper wear ring 13, an upper O-ring 15, and a lower O-ring 16.

[0026] The back surface of the piston 18 is provided with a first positioning groove 19 and a second positioning groove 19-1.

[0027] The first tooth back wear plate 14 and the second tooth back wear plate 14-1 are installed in the first positioning groove 19 and the second positioning groove 19-1 respectively;

[0028] The rack on the piston 18 contacts the cylindrical gear of the main shaft 11, and the first tooth back wear plate 14 and the second tooth back wear plate 14-1 contact the inner wall of the cylinder body 10 respectively.

[0029] The above design structure, on the one hand, enables the actuator to have a buffer deceleration function (function 1) at the 0° opening start stage and the closing end stage, and on the other hand, enables the actuator to have a buffer deceleration function (function 2) at the 90° opening end stage and the closing start stage.

[0030] In addition, the first tooth back wear plate 14 and the second tooth back wear plate 14-1 are preferably integrally formed injection molded parts; wherein the contact surfaces between the first tooth back wear plate 14 and the second tooth back wear plate 14-1 and the inner wall of the cylinder body 10 are respectively set to inclined structures.

[0031] In addition, the first tooth back wear plate 14 and the second tooth back wear plate 14 - 1 are preferably configured as arc-shaped structures respectively.

[0032] Please review the structural principle or working principle of the automatic buffer deceleration mechanism applied to pneumatic actuators in this structure. Figures 1 to 6 :

[0033] (1) In the closed state: the actuator air inlet 101 inputs air pressure; the gas passes through the air hole, and the position of the air hole is exactly at the same position as the position of the first tooth back wear plate 14-1 on the back of the piston tooth. Since the first tooth back wear plate 14-1 has an inclined surface, the compressed air entering the middle cavity of the actuator cylinder through the air hole is blocked by the narrow inclined surface and the flow rate is very small, which makes the actuator opening speed very slow, and the opening speed of the valve connected to the actuator is also slow, realizing the buffer deceleration function at the beginning of the opening required by function 1 of the automatic buffer mechanism principle, avoiding damage caused by the sudden increase of water hammer pressure due to the sudden opening of the valve.

[0034] (2) The pressure entering the middle cavity of the cylinder 10 increases. Under the action of the two reversed pistons 18, the actuator drives the main shaft 11 to rotate counterclockwise. The pistons 18 move to the left and right of the cylinder 10 respectively. As the moving distance increases, the positions of the first tooth back wear plate 14-1 and the air inlet 1 also change. The air inlet 1 that was originally blocked by the first tooth back wear plate 14-1 is no longer blocked as the moving distance increases, thereby increasing the amount of compressed air entering the actuator, which speeds up the actuator.

[0035] (3) When the actuator runs to nearly 90°, the distance between the second tooth back wear plate 14 and the air inlet 101 becomes smaller, and the inclined surface on the second tooth back wear plate 14 reduces the flow area of ​​the air inlet 1, thereby changing the amount of compressed air entering the cylinder 10, until the actuator runs to 90°, thereby realizing the function 2 of the automatic buffer mechanism principle to be realized. The actuator plays a buffering and deceleration role when it is in the 90° opening end stage position.

[0036] (4) The exhaust port 102 of the actuator is connected to the cavities on both sides of the actuator. When the actuator starts to close at the 90° position, compressed air enters the exhaust port 102. The piston 18 is acted upon by the compressed air and the main shaft 11 rotates clockwise. The piston 18 starts to move toward the middle, and the compressed air in the middle cavity is discharged outward through the air inlet 101. Due to the inclined surface on the second tooth back wear plate 14 at the air inlet 101, the air inlet 101 is blocked, and the flow area becomes smaller, so that the speed of the actuator at the 90° closing start position slows down. The principle of the automatic buffer mechanism should be realized. The current function 2 actuator has a buffering and deceleration function at the beginning of the 90° closing stage; as the cavity pressure on both sides of the actuator increases, the second tooth back wear plate 14 leaves the air inlet 101, and the closing speed of the actuator increases. When the actuator approaches 0°, the first tooth back wear plate 14-1 approaches the air inlet 101, and the inclined surface on the first tooth back wear plate 14-1 blocks the air inlet 101, and the flow area becomes smaller, causing the actuator to slow down at the closing end position (0°), realizing the buffering and deceleration function of the closing end stage of function 1 that the automatic buffer mechanism principle is to achieve.

[0037] It should be noted that, in this article, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An automatic buffering and deceleration mechanism for a pneumatic actuator, comprising a cylinder (10), a main shaft (11), an air inlet (101) and an air outlet (102), characterized in that: The cylinder (10) is provided with a piston (18) mounted on both sides. The end surface of the piston (18) is equipped with a wear-resistant ring (12) and a piston O-ring (17). The main shaft (11) is equipped with an upper wear-resistant ring (13), an upper O-ring (15) and a lower O-ring (16). The back surface of the teeth of the piston (18) is provided with a first positioning groove (19) and a second positioning groove (19-1). A first tooth back wear-resistant sheet (14) and a second tooth back wear-resistant sheet (14-1) are respectively installed in the first positioning groove (19) and the second positioning groove (19-1); The rack on the piston (18) contacts the cylindrical gear of the main shaft (11), and the first tooth back wear plate (14) and the second tooth back wear plate (14-1) contact the inner wall of the cylinder body (10) respectively.

2. The automatic buffering and deceleration mechanism for pneumatic actuator according to claim 1, characterized in that: The first tooth back wear-resistant plate (14) and the second tooth back wear-resistant plate (14-1) are respectively integrally formed injection molded parts; The contact surfaces of the first tooth back wear plate (14), the second tooth back wear plate (14-1) and the inner wall of the cylinder body (10) are respectively arranged as inclined surface structures.

3. The automatic buffering and deceleration mechanism for pneumatic actuator according to claim 1, characterized in that: The first tooth back wear-resistant plate (14) and the second tooth back wear-resistant plate (14-1) are respectively arranged as arc-shaped structures.

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