Mechanism for installing angular position switch of angular travel pneumatic control valve

Abstract

The utility model belongs to the technical field of valve instrument installation, and relates to a mechanism for installing an angular position switch of an angular travel pneumatic control valve, which comprises an angular travel pneumatic actuator, an output shaft of the angular travel pneumatic actuator is connected with a feedback main shaft of an installation box, and a feedback auxiliary shaft is further arranged in the installation box. The feedback auxiliary shaft and the feedback main shaft rotate synchronously; the feedback main shaft is connected with an input shaft of the positioner, and the feedback auxiliary shaft is connected with an input shaft of the position switch. According to the mechanism for installing the angular position switch of the angular travel pneumatic control valve, rotation of the output shaft is synchronously transmitted to feedback of the positioner and the position switch through the gear and the rack in the installation box, and the installation box is simple in structure and convenient to disassemble, assemble and maintain; the universality is high, the installation space is not limited, the performance of the valve is not affected, and the valve is suitable for angular travel valves of various specifications.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve instrument installation, and relates to a mechanism for installing an angle position switch of an angular travel pneumatic regulating valve. Background Art

[0002] The positioner receives the control signal from the DCS to control the valve opening. When the positioner fails, it will no longer be able to control the valve opening, and the valve will reset to the open or closed position. The position switch senses the open and closed positions of the valve and feeds back the fault information to the DCS so that timely measures can be taken on site to ensure the safe and normal operation of on-site production equipment. The installation of the positioner and the position switch both need to be connected to the output shaft of the angular stroke pneumatic actuator, but the angular stroke pneumatic actuator has only one output shaft, which makes installation difficult. The rotation of the output shaft needs to be synchronously transmitted to the positioner and the position switch. Summary of the invention

[0003] In view of the above problems, the utility model provides a mechanism for installing an angle position switch of an angular stroke pneumatic regulating valve, which can synchronously transmit the rotation of an output shaft to a positioner and a position switch.

[0004] According to the technical solution of the utility model: a mechanism for installing an angle position switch of an angular stroke pneumatic regulating valve, characterized in that: it includes an angular stroke pneumatic actuator, the output shaft of the angular stroke pneumatic actuator is connected to the feedback main shaft of the installation box, and the installation box is also provided with a feedback secondary shaft, and the feedback secondary shaft rotates synchronously with the feedback main shaft;

[0005] The feedback main shaft is connected to the input shaft of the positioner, and the feedback secondary shaft is connected to the input shaft of the position switch.

[0006] As a further improvement of the utility model, the installation box comprises a base and an upper cover which are sealed and connected, the base is provided with a sliding groove, and a movable rack is provided in the sliding groove;

[0007] A driving gear is installed on the feedback main shaft, and a driven gear is installed on the feedback secondary shaft. The driving gear and the driven gear are respectively meshed with the rack.

[0008] As a further improvement of the utility model, a sealing gasket is provided on the joint surface of the base and the upper cover, and a first O-ring is used to realize rotational sealing between the feedback main shaft and the upper cover and the base respectively, and a second O-ring is used to realize rotational sealing between the feedback secondary shaft and the upper cover.

[0009] As a further improvement of the utility model, the upper and lower positions of the driving gear are respectively limited by a first elastic retaining ring;

[0010] The upper and lower positions of the driven gear are limited by second elastic retaining rings respectively.

[0011] As a further improvement of the utility model, the joint surfaces of the base and the upper cover are staggered, and the upper cover and the base are connected by cross countersunk screws.

[0012] As a further improvement of the present utility model, the mounting box is fixedly connected to the angular stroke pneumatic actuator via a lower bracket;

[0013] The installation box is fixedly connected to the positioner and the position switch through an upper bracket respectively.

[0014] The technical effect of the utility model is that the mechanism for installing the angle position switch of an angular stroke pneumatic regulating valve described in the utility model synchronously transmits the rotation of the output shaft to the feedback of the positioner and the position switch through the gear rack in the installation box, and the installation box has a simple structure and is easy to disassemble and maintain; it has strong versatility, is not restricted by the installation space, and does not affect the performance of the valve itself, and is suitable for angular stroke valves of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a schematic diagram of the internal structure of the installation box of the utility model.

[0017] Figure 3 It is a cross-sectional view of the installation box of the utility model. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings.

[0019] Figure 1-3 The invention comprises an angular stroke pneumatic actuator 1, an output shaft 2, a mounting box 3, a base 31, a sliding groove 311, an upper cover 32, a feedback main shaft 33, a feedback secondary shaft 34, a driving gear 35, a driven gear 36, a rack 37, a sealing gasket 38, a first O-ring 39, a circlip 310, a positioner 4, a positioner feedback shaft 5, a position switch 6, a position switch feedback shaft 7, etc.

[0020] like Figure 1-3 As shown, the utility model is a mechanism for installing an angular position switch of an angular stroke pneumatic regulating valve, including an angular stroke pneumatic actuator 1, wherein the output shaft 2 of the angular stroke pneumatic actuator 1 is connected to a feedback main shaft 33 of a mounting box 3, and a feedback secondary shaft 34 is also provided in the mounting box 3, and the feedback secondary shaft 34 rotates synchronously with the feedback main shaft 33.

[0021] The feedback main shaft 33 is connected to the input shaft of the positioner 4, and the feedback secondary shaft 34 is connected to the input shaft of the position switch 6, so as to realize the 1:1 transmission of the rotation angle of the feedback main shaft 33 to the feedback secondary shaft 34. In specific use, the lower end of the output shaft 2 passes through the angular stroke pneumatic actuator 1 and is connected to the valve opening and closing part, and the angular stroke pneumatic actuator 1 drives the valve to rotate, that is, the rotation angle of the output shaft 2 is the rotation angle of the valve. The input shaft of the positioner 4 is the positioner feedback shaft 5, and the input shaft of the position switch 6 is the position switch feedback shaft 7.

[0022] Furthermore, the installation box 3 includes a base 31 and an upper cover 32 which are sealed and connected. The base 31 is provided with a sliding groove 311 , and a movable rack 37 is arranged in the sliding groove 311 .

[0023] A driving gear 35 is installed on the feedback main shaft 33 , and a driven gear 36 is installed on the feedback secondary shaft 34 . The driving gear 35 and the driven gear 36 are meshed with a rack 37 respectively.

[0024] A sealing gasket 38 is provided on the joint surface of the base 31 and the upper cover 32 , and a first O-ring 39 is used to realize rotational sealing between the feedback main shaft 33 and the upper cover 32 and the base 31 , respectively, and a second O-ring is used to realize rotational sealing between the feedback secondary shaft 34 and the upper cover 32 .

[0025] The upper and lower positions of the driving gear 35 are limited by the first elastic retaining ring 310 , and the upper and lower positions of the driven gear 36 are limited by the second elastic retaining ring 310 .

[0026] The joint surfaces of the base 31 and the upper cover 32 are staggered, and the upper cover 32 and the base 31 are connected by cross countersunk screws.

[0027] The mounting box 3 is fixedly connected to the angular stroke pneumatic actuator 1 via a lower bracket.

[0028] The installation box 3 is fixedly connected to the positioner 4 and the position switch 6 through an upper bracket respectively.

[0029] like Figure 1-3 As shown, the working principle of the utility model is: when the valve is actuated, the positioner 4 obtains the valve position information through the connection between the feedback main shaft 33 and the output shaft 2, and the position switch 6 obtains the valve position information through the transmission synchronization of the driving gear 35, the driven gear 36 and the rack 37 to ensure that the positioner 4 and the position switch 6 can work at the same time.

[0030] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A mechanism for installing an angle position switch of an angular travel pneumatic regulating valve, characterized in that: The invention comprises an angular stroke pneumatic actuator (1), wherein an output shaft (2) of the angular stroke pneumatic actuator (1) is connected to a feedback main shaft (33) of a mounting box (3), wherein a feedback secondary shaft (34) is further provided in the mounting box (3), and the feedback secondary shaft (34) rotates synchronously with the feedback main shaft (33); The feedback main shaft (33) is connected to the input shaft of the positioner (4), and the feedback secondary shaft (34) is connected to the input shaft of the position switch (6).

2. The mechanism for installing the angle position switch of the angular stroke pneumatic regulating valve according to claim 1, characterized in that: The installation box (3) comprises a base (31) and an upper cover (32) which are sealed and connected to each other; the base (31) is provided with a sliding groove (311); a movable rack (37) is arranged in the sliding groove (311); A driving gear (35) is mounted on the feedback main shaft (33), and a driven gear (36) is mounted on the feedback secondary shaft (34); the driving gear (35) and the driven gear (36) are respectively meshed with a rack (37).

3. The mechanism for installing the angle position switch of the angular stroke pneumatic regulating valve according to claim 2, characterized in that: A sealing gasket (38) is provided on the joint surface of the base (31) and the upper cover (32); a first O-ring (39) is used to respectively realize rotational sealing between the feedback main shaft (33) and the upper cover (32) and the base (31); and a second O-ring is used to realize rotational sealing between the feedback secondary shaft (34) and the upper cover (32).

4. The mechanism for installing an angle position switch of an angular stroke pneumatic regulating valve according to claim 2, characterized in that: The upper and lower positions of the driving gear (35) are respectively limited by a first elastic retaining ring (310); The upper and lower positions of the driven gear (36) are respectively limited by second elastic retaining rings.

5. The mechanism for installing the angle position switch of the angular stroke pneumatic regulating valve according to claim 2, characterized in that: The joint surfaces of the base (31) and the upper cover (32) are staggered, and the upper cover (32) and the base (31) are connected via cross countersunk screws.

6. The mechanism for installing an angle position switch of an angular stroke pneumatic regulating valve according to claim 1, characterized in that: The mounting box (3) is fixedly connected to the angular stroke pneumatic actuator (1) via a lower bracket; The installation box (3) is fixedly connected to the positioner (4) and the position switch (6) respectively via an upper bracket.

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