Side-mounted feedback device of pneumatic actuating mechanism

Abstract

The utility model provides a side-mounted feedback device of a pneumatic actuating mechanism. The side-mounted feedback device comprises a support, a feedback plate, a guide column and a rocker arm, one side of the support is connected with the side face of the pneumatic executing mechanism, and the other side is connected with the positioner. The pneumatic executing mechanism comprises a piston rod extending end arranged on the side face, one end of the feedback plate is connected with the piston rod extending end, the other end is provided with a first adjusting hole, and the guide column is connected with the feedback plate through the first adjusting hole. One end of the rocker arm is provided with an abutting hole of a long-strip structure, the other end of the rocker arm is provided with a shaft sleeve, and the end, away from the feedback plate, of the guide column abuts against the rocker arm through the abutting hole. A second adjusting hole is formed in the side, connected with the positioner, of the support, and the shaft sleeve is inserted into the input shaft of the positioner through the second adjusting hole. By arranging the support of the open structure, enough installation space can be provided, the connection mode is a simple detachable connection mode, personnel can assemble the feedback device conveniently, and the problem that the feedback device of the pneumatic actuating mechanism is inconvenient to install can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of pneumatic actuator feedback, and in particular to a side-mounted feedback device for a pneumatic actuator. Background Art

[0002] The pneumatic actuator is a mechanism used to control the start, close, and flow rate of a valve. In order to control the valve and provide feedback on the valve position, a positioner needs to be installed on the pneumatic actuator. When installing the positioner on the pneumatic actuator, the positioner is installed in a top-mounted manner in some embodiments, depending on the structure of the pneumatic actuator.

[0003] However, for pneumatic actuators of different cylinder diameters, some top-mounted feedback devices are inconvenient to install due to the limitation of the top space, resulting in reduced installation production efficiency. At the same time, it is also difficult to disassemble them for maintenance or replacement after installation. In addition, the installation position of the top-mounted accessories is close to the valve stem, and the temperature at the valve stem is high, which will affect the electronic components such as the positioner and solenoid valve, thereby affecting the service life of the electronic components and increasing maintenance costs. Utility Model Content

[0004] The present application provides a side-mounted feedback device for a pneumatic actuator to solve the problem of inconvenient installation of the feedback device for the pneumatic actuator.

[0005] The present application provides a side-mounted feedback device for a pneumatic actuator, comprising: a bracket, a feedback plate, a guide column and a rocker arm; wherein the feedback plate, the guide column and the rocker arm are arranged on the inner side of the bracket;

[0006] One side of the bracket is detachably connected to the side of the pneumatic actuator, and the other side of the bracket is detachably connected to the positioner;

[0007] The pneumatic actuator comprises a piston rod extension end, and the piston rod extension end is arranged on the side of the pneumatic actuator; one end of the feedback plate is detachably connected to the piston rod extension end, and the other end of the feedback plate is provided with a first adjustment hole, and the guide column is detachably connected to the feedback plate through the first adjustment hole;

[0008] A contact hole is provided at one end of the rocker arm, and the contact hole is a long hole, and a shaft sleeve is provided at the other end of the rocker arm; the end of the guide column away from the feedback plate is in contact with the rocker arm through the contact hole; a second adjustment hole is provided on the side of the bracket connected to the positioner, and the shaft sleeve is plugged into the input shaft of the positioner through the second adjustment hole.

[0009] The linear reciprocating motion of the extended end of the piston rod drives the feedback plate to reciprocate, thereby driving the rocker arm to swing with the shaft sleeve as the axis, so that the input shaft of the positioner and the shaft sleeve rotate synchronously, and the position of the piston rod can be fed back. In addition, each part of the device is installed independently, which is convenient for operators to assemble the feedback device.

[0010] Optionally, the first adjustment hole is a strip hole. By providing the first adjustment hole in a strip shape, the pneumatic actuator with different strokes can be adapted without replacing the feedback plate.

[0011] Optionally, the guide column includes a fixed portion and a sliding portion, and the guide column is detachably connected to the feedback plate through the fixed portion; one end of the sliding portion is sleeved with the fixed portion, and the other end of the sliding portion is provided with a conical surface, and the guide column abuts against the abutment hole through the conical surface. By providing the conical surface, the guide column can be fitted with the abutment hole, reducing the shaking of the guide column and improving the accuracy of the positioner.

[0012] Optionally, the guide column further includes a spring, and the spring is sleeved on the outer side of the fixed portion; one end of the spring abuts against the feedback plate, and the other end of the spring abuts against the sliding portion. By providing the spring, the conical surface of the guide column can be closely fitted with the rocker arm, thereby preventing the guide column and the rocker arm from being separated. It is also possible to provide an installation margin for the distance between the guide column and the rocker arm, allowing for errors in the size of the bracket.

[0013] Optionally, the bushing is arranged on a side of the rocker arm away from the guide column.

[0014] Optionally, the rocker arm is a cylindrical structure. The rocker arm with a cylindrical structure can make the abutment between the conical surface and the abutment hole more closely fitted and reliable.

[0015] Optionally, a mounting hole is further provided on one side of the bracket connected to the locator, and the locator is detachably connected to the bracket through the mounting hole; and both the mounting hole and the second adjustment hole are elongated holes. By providing the mounting hole and the second adjustment hole of the elongated structure, the installation position of the locator can be adjusted.

[0016] Optionally, after the sleeve is plugged into the input shaft of the positioner, the distance between the top end surface of the sleeve and the side surface of the bracket connected to the positioner is greater than zero, so as to prevent the top end surface of the sleeve from fitting with the side surface and hindering the movement of the sleeve.

[0017] It can be seen from the above technical scheme that the present application provides a side-mounted feedback device for a pneumatic actuator, including: a bracket and a feedback plate, a guide column, and a rocker arm arranged on the inner side of the bracket. One side of the bracket is connected to the side of the pneumatic actuator, and the other side is connected to the positioner. The pneumatic actuator includes a piston rod protruding end arranged on the side, one end of the feedback plate is connected to the piston rod protruding end, and the other end is provided with a first adjustment hole, and the guide column is connected to the feedback plate through the first adjustment hole, and the first adjustment hole is a long hole. One end of the rocker arm is provided with an abutment hole of a long structure, and the other end is provided with a shaft sleeve, and the end of the guide column away from the feedback plate abuts with the rocker arm through the abutment hole. A second adjustment hole is provided on the side of the bracket connected to the positioner, and the shaft sleeve is plugged with the input shaft of the positioner through the second adjustment hole. By setting a bracket with an open structure, sufficient installation space can be provided, and each part in the device is installed independently, and the connection method is a simple detachable connection method, which is convenient for operators to assemble the feedback device, and can solve the problem of inconvenient installation of the pneumatic actuator feedback device. At the same time, since the first adjustment hole on the feedback plate is a long hole, it is possible to adapt to pneumatic actuators with different strokes without replacing the feedback plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0019] Figure 1 A schematic diagram of the installation structure of the feedback device and the pneumatic actuator provided in the embodiment of the present application;

[0020] Figure 2 A schematic diagram of the structure of a feedback device provided in an embodiment of the present application;

[0021] Figure 3 A schematic diagram of the top view of the feedback device provided in an embodiment of the present application.

[0022] Reference numerals:

[0023] Among them, 1-pneumatic actuator; 2-bracket; 21-second adjustment hole; 22-mounting hole; 3-feedback plate; 4-guide column; 41-spring; 5-rocker arm; 51-sleeve. DETAILED DESCRIPTION

[0024] The following embodiments are described in detail, and examples thereof are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following embodiments do not represent all implementations consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application as detailed in the claims.

[0025] For pneumatic actuators with different cylinder diameters, some top-mounted feedback devices are inconvenient to install due to the limitation of top space, which reduces the installation production efficiency. At the same time, it is also difficult to disassemble them if they need to be repaired or replaced after installation. In addition, the installation position of the top-mounted accessories is close to the valve stem, and the temperature at the valve stem is high, which will affect the electronic components such as positioners and solenoid valves, thereby affecting the service life of the electronic components and increasing maintenance costs.

[0026] In order to solve the problem of inconvenient installation of the pneumatic actuator feedback device, some embodiments of the present application provide a pneumatic actuator side-mounted feedback device, see Figure 2 , Figure 2 This is a schematic diagram of the structure of the feedback device provided in the embodiment of the present application. The feedback device provided in the embodiment of the present application includes: a bracket 2, a feedback plate 3, a guide column 4 and a rocker arm 5. Among them, the feedback plate 3, the guide column 4 and the rocker arm 5 are arranged on the inner side of the bracket 2. One side of the bracket 2 is detachably connected to the side of the pneumatic actuator 1, and the other side of the bracket 2 is detachably connected to the positioner.

[0027] The bracket 2 includes a connection surface and a mounting surface. In some embodiments, the bracket 2 may be a C-shaped structure, which may be a sheet metal structure made by bending. The two ends of the mounting surface are respectively connected to a connection surface, and the connection surface is provided with a connection hole for mounting the bracket 2. Figure 1 and Figure 3 , Figure 1 A schematic diagram of the installation structure of the feedback device and the pneumatic actuator provided in the embodiment of the present application, Figure 3 This is a schematic diagram of the top structure of the feedback device provided in the embodiment of the present application, in which the connecting surface is connected to the side of the pneumatic actuator 1, and the mounting surface is connected to the positioner. The bracket 2 can be detachably connected to the side of the pneumatic actuator 1 through the connecting holes on the connecting surface. The connecting hole can be a long hole to facilitate the adjustment of the installation height of the bracket 2. A column is provided on the outside of the cylinder of the pneumatic actuator 1, and a support leg is provided on the column. The bracket 2 can be fixed to the side of the pneumatic actuator 1 by inserting the support leg into the connecting hole on the connecting surface. And because the two ends of the bracket 2 are open, it is convenient for the operator to install.

[0028] The pneumatic actuator 1 includes a piston rod extension end, which is arranged on the side of the pneumatic actuator 1. One end of the feedback plate 3 is detachably connected to the piston rod extension end. For example, an external thread may be arranged on the piston rod extension end, and a through hole is arranged on the end of the feedback plate 3 connected to the piston rod extension end. The feedback plate 3 is fixed to the piston rod extension end through a threaded connection. It can be understood that the piston rod in the pneumatic actuator 1 performs linear reciprocating motion. Since the feedback plate 3 is connected to the piston rod extension end of the pneumatic actuator 1, when the piston rod of the pneumatic actuator 1 performs linear reciprocating motion, the feedback plate 3, driven by the piston rod extension end, performs the same motion as the piston rod. In some embodiments, the feedback plate 3 may be a J-shaped structure, which may be made by bending a steel plate, wherein the through hole is arranged on the side where the short side of the J-shaped structure is located, so that the feedback plate 3 can be detachably connected to the piston rod extension end. A first adjustment hole is arranged on the end of the feedback plate 3 away from the piston rod extension end, that is, on the side where the long side of the J-shaped structure is located. The first adjustment hole is also a long strip hole. Figure 1 Taking the installation direction in as an example, the first adjustment hole is set horizontally.

[0029] The feedback plate 3 is detachably connected to the guide column 4 through the first adjustment hole. For example, an external thread may be provided at one end of the guide column 4, and a nut may be screwed in after one end of the guide column 4 is inserted into the first adjustment hole of the feedback plate 3 to fix the guide column 4 on the feedback plate 3. Since the first adjustment hole is a horizontally arranged long hole, the horizontal installation position of the guide column 4 on the feedback plate 3 may be adjusted before the guide column 4 is fixed. When the stroke of the pneumatic actuator 1 is different, the feedback function of the device can be realized by adjusting the horizontal position of the guide column 4 on the feedback plate 3 without replacing the feedback plate 3, so that the feedback plate 3 can be universally used without the need for one-to-one production according to pneumatic actuators 1 with different strokes.

[0030] The guide column 4 includes a fixed part and a sliding part, and the above-mentioned external thread is set on the fixed part, so that the guide column 4 can be detachably connected with the feedback plate 3 through the fixed part. One end of the sliding part is sleeved with the fixed part, and the sliding part can slide along the fixed part, and is limited by the end of the fixed part without the external thread to prevent the sliding part from detaching from the fixed part. The other end of the sliding part is provided with a conical surface, and the guide column 4 abuts against one end of the rocker arm 5 through the conical surface.

[0031] See again Figure 3In some embodiments, the guide column 4 further includes a spring 41, which is disposed between the feedback plate 3 and the sliding portion, and the spring 41 is sleeved on the outer side of the fixed portion. One end of the spring 41 abuts against the feedback plate 3, and the other end of the spring 41 abuts against the sliding portion. By providing the spring 41, under the action of the elastic force of the spring 41, the sliding portion can be pressed against the rocker arm 5, so that the conical surface fits tightly with the rocker arm 5, thereby preventing the guide column 4 and the rocker arm 5 from being separated. Therefore, it should also be noted that after assembly, the spring 41 should be in a compressed state. At the same time, since the distance between the guide column 4 and the rocker arm 5 is affected by the length dimension of the connecting surface of the bracket 2, by providing the spring 41, an installation margin can also be provided for the distance between the guide column 4 and the rocker arm 5, that is, an error in the length dimension of the connecting surface of the bracket 2 is allowed.

[0032] See again Figure 2 The rocker arm 5 is a cylindrical structure, and an abutment hole is provided at one end of the rocker arm 5, and the conical surface of the guide column 4 abuts against the abutment hole of the rocker arm 5. Since the side surface of the cylindrical rocker arm 5 is arc-shaped, the two sides of the abutment hole of the rocker arm 5 can be tightly attached to the conical surface of the guide column 4, so that the guide column 4 and the rocker arm 5 will not deflect, which can reduce the probability of the positioning accuracy of the positioner being reduced. When the feedback plate 3 follows the extended end of the piston rod to make a reciprocating linear motion, it will drive the fixed column 4 to move. Therefore, the abutment hole is a long strip hole so that the guide column 4 can make a linear displacement movement in the abutment hole of the rocker arm 5.

[0033] The other end of the rocker arm 5 is provided with a shaft sleeve 51, which is arranged on the side of the rocker arm 5 away from the guide column 4. The shaft sleeve 51 is a cylindrical structure and can be fixedly connected to the rocker arm 5 by welding. Since the pneumatic actuator 1 and the positioner are respectively arranged on both sides of the bracket 2, in the structure of the embodiment of the present application, the shaft sleeve 51 and the guide column 4 must be arranged on different sides.

[0034] The bracket 2 is connected to one side of the positioner, that is, the mounting surface is provided with a second adjustment hole 21, and the sleeve 51 is plugged with the input shaft of the positioner through the second adjustment hole 21. In some embodiments, a threaded hole can be provided on the side of the sleeve 51, and the input shaft of the positioner can be tightened by a screw to fix the sleeve 51 relatively to the input shaft of the positioner. When the feedback plate 3 makes a reciprocating linear motion, the rocker arm 5 swings up and down with the sleeve 51 as the axis driven by the guide column 4, and then the input shaft of the positioner can be driven to rotate to feedback the position of the piston rod of the pneumatic actuator 1. By plugging the input shaft of the positioner with the sleeve 51, a force in the opposite direction of the spring 41 can be provided to the other end of the rocker arm 5, so that the rocker arm 5 can maintain balance. It should also be noted that after the sleeve 51 is plugged with the input shaft of the positioner, the distance between the top surface of the sleeve 51 and the mounting surface is greater than zero to prevent the top surface of the sleeve 51 from being attached to the mounting surface and hindering the movement of the sleeve 51.

[0035] The bracket 2 is connected to one side of the positioner, that is, the mounting surface is also provided with a mounting hole 22, and the positioner is detachably connected to the mounting surface through the mounting hole 22. In some embodiments, the mounting hole 22 and the second adjustment hole 21 are also long holes, and by providing the mounting hole 22 and the second adjustment hole 21 with a long structure, the installation position of the positioner can be adjusted, and positioners of different models can also be installed.

[0036] During assembly, first fix the bracket 2 to the side of the pneumatic actuator 1, then fix the feedback plate 3 to the output end of the piston rod, then fix the positioner to the other side of the bracket 2, then fix the guide column 4 to the feedback plate 3, and finally fix the shaft sleeve 51 of the rocker arm to the input shaft of the positioner. Although the feedback plate 3, the guide column 4 and the rocker arm 5 are arranged on the inner side of the bracket 2, the open bracket 2 provides sufficient installation space, and each part of the device is installed separately and independently, and the connection method is a simple detachable connection method, which is convenient for operators to assemble the feedback device.

[0037] It can be seen from the above technical scheme that the embodiment of the present application provides a side-mounted feedback device for a pneumatic actuator, including: a bracket 2, a feedback plate 3, a guide column 4 and a rocker arm 5. Among them, the feedback plate 3, the guide column 4 and the rocker arm 5 are arranged on the inner side of the bracket 2. One side of the bracket 2 is connected to the side of the pneumatic actuator 1, and the other side of the bracket 2 is connected to the positioner. The pneumatic actuator 1 includes a piston rod protruding end arranged on the side, one end of the feedback plate 3 is connected to the piston rod protruding end, the other end of the feedback plate 3 is provided with a first adjustment hole, and the guide column 4 is connected to the feedback plate 3 through the first adjustment hole. One end of the rocker arm 5 is provided with an abutment hole of a long strip structure, and the other end of the rocker arm 5 is provided with a shaft sleeve 51; the end of the guide column 4 away from the feedback plate 3 is abutted with the rocker arm 5 through the abutment hole. A second adjustment hole 21 is provided on the side of the bracket 2 connected to the positioner, and the shaft sleeve 51 is plugged with the input shaft of the positioner through the second adjustment hole 21. By setting up an open-structure bracket, sufficient installation space can be provided, and each part in the device is installed separately and independently, and the connection method is also a simple detachable connection method, which is convenient for operators to assemble the feedback device and can solve the problem of inconvenient installation of the pneumatic actuator feedback device.

[0038] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the general concept of this application and do not constitute a limitation on the protection scope of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without creative work belong to the protection scope of this application.

Claims

1. A side-mounted feedback device for a pneumatic actuator, It is characterized in that include: A bracket (2), a feedback plate (3), a guide column (4) and a rocker arm (5); wherein the feedback plate (3), the guide column (4) and the rocker arm (5) are arranged on the inner side of the bracket (2); One side of the bracket (2) is detachably connected to the side of the pneumatic actuator (1), and the other side of the bracket (2) is detachably connected to the positioner; The pneumatic actuator (1) comprises a piston rod extension end, and the piston rod extension end is arranged on the side of the pneumatic actuator (1); one end of the feedback plate (3) is detachably connected to the piston rod extension end, and the other end of the feedback plate (3) is provided with a first adjustment hole, and the guide column (4) is detachably connected to the feedback plate (3) through the first adjustment hole; One end of the rocker arm (5) is provided with an abutment hole, and the abutment hole is a long hole, and the other end of the rocker arm (5) is provided with a shaft sleeve (51); the end of the guide column (4) away from the feedback plate (3) is abutted with the rocker arm (5) through the abutment hole; the side of the bracket (2) connected to the positioner is provided with a second adjustment hole (21), and the shaft sleeve (51) is plugged into the input shaft of the positioner through the second adjustment hole (21).

2. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that The first adjustment hole is an elongated hole.

3. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that The guide column (4) comprises a fixed portion and a sliding portion, and the guide column (4) is detachably connected to the feedback plate (3) via the fixed portion; one end of the sliding portion is sleeved with the fixed portion, and the other end of the sliding portion is provided with a conical surface, and the guide column (4) is in contact with the contact hole via the conical surface.

4. The pneumatic actuator side-mounted feedback device according to claim 3, It is characterized in that The guide column (4) further comprises a spring (41), wherein the spring (41) is sleeved on the outer side of the fixing portion; one end of the spring (41) abuts against the feedback plate (3), and the other end of the spring (41) abuts against the sliding portion.

5. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that The shaft sleeve (51) is arranged on a side of the rocker arm (5) away from the guide column (4).

6. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that The rocker arm (5) is a cylindrical structure.

7. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that A mounting hole (22) is also provided on one side of the bracket (2) connected to the positioner, and the positioner is detachably connected to the bracket (2) via the mounting hole (22); and the mounting hole (22) and the second adjustment hole (21) are both elongated holes.

8. The pneumatic actuator side-mounted feedback device according to claim 1, It is characterized in that After the shaft sleeve (51) is plugged into the input shaft of the positioner, the distance between the top end surface of the shaft sleeve (51) and the side surface of the bracket (2) connected to the positioner is greater than zero.

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