A valve position transducer for pneumatically controlled valves or actuators

Abstract

The utility model discloses a valve displacement measuring instrument for pneumatic control valve or executing mechanism in the field of pneumatic executing mechanism detection, mainly includes stand, grating ruler, cross bar, vertical rod, crab clamp, the stand is long pole structure, and its length direction is perpendicular to horizontal plane, the slide rail of grating ruler is fixed on the stand, the cross bar is fixed on the sliding block of grating ruler, the vertical rod is fixed on the cross bar, the crab clamp is fixed on the vertical rod, the sliding block, cross bar, vertical rod and crab clamp constitute a whole, move together with the push rod of pneumatic control valve or executing mechanism, and grating ruler measures the displacement of push rod. The utility model discloses through selecting appropriate connector spare and connecting grating ruler with the push rod of pneumatic control valve or executing mechanism, has obtained the technical effect of accurate measurement push rod displacement, has improved the quality and efficiency of valve detection.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic actuator testing, and in particular to a valve displacement measuring instrument for pneumatic control valves or actuators. Background Technology

[0002] The research, development, testing, and factory inspection of pneumatic control valves or actuators require verification of compliance with national standards. Their performance indicators are mainly reflected in rated stroke deviation and endpoint deviation. Currently, rated stroke deviation is rarely measured or is performed visually; endpoint deviation is currently measured using pressure gauges. To improve the accuracy and efficiency of testing pneumatic control valves or actuators, it is necessary to develop a new measuring instrument. Utility Model Content

[0003] To address the aforementioned problems in the existing technology, this utility model provides a valve displacement measuring instrument for pneumatic control valves or actuators. By selecting appropriate connecting devices to connect the push rod of the pneumatic control valve or actuator to the grating ruler, the technical effect of accurately measuring the push rod displacement is achieved.

[0004] The technical solution of this utility model is as follows:

[0005] A valve displacement measuring instrument for pneumatic control valves or actuators includes a column 1, a connector 2, an indicator light 3, a displacement sensor 4, a crossbar mounting plate 5, a crossbar 6, a longitudinal bar 7, a crab claw clamp 8, a first-hand-tightening nut 9, a cross-shaped fixing section 10, and a second-hand-tightening nut 11.

[0006] The column 1 is a long rod structure; the connector 2 is used to fix the column 1.

[0007] The displacement sensor 4 includes a slide rail 12 and a measuring slider 13; the slide rail 12 is fixed on the column 1, and the length direction of the slide rail 12 is parallel to the length direction of the column 1; the measuring slider 13 moves linearly on the slide rail 12 and measures the displacement in the direction of movement.

[0008] The crossbar mounting plate 5 is fixed on the measuring slider 13; the second plum blossom hand-tightening nut 11 is fixed on the crossbar mounting plate 5; the crossbar 6 is a long rod structure, and the second plum blossom hand-tightening nut 11 fixes one end of the crossbar 6 to the crossbar mounting plate 5;

[0009] The longitudinal rod 7 is a long rod structure, and the plum blossom hand-tightening nut 9 fixes the crab claw clamp 8 to one end of the longitudinal rod 7; the cross fixing joint 10 fixes the longitudinal rod 7 to the cross rod 6;

[0010] The horizontal bar mounting plate 5, horizontal bar 6, vertical bar 7, crab claw clamp 8, plum blossom hand-tightening nut one 9, cross fixing section 10, plum blossom hand-tightening nut two 11, and measuring slider 13 form a whole, called the measuring mechanism; the measuring mechanism moves linearly on the slide rail 12;

[0011] After the crab claw clamp 8 clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves linearly along with the push rod; the displacement sensor 4 measures the displacement of the measuring mechanism; when the indicator light 3 is off, it means that the displacement sensor 4 has stopped operating; when the indicator light 3 is on, it means that the displacement sensor 4 is operating.

[0012] Furthermore, the column 1 is cut from industrial aluminum profiles.

[0013] Furthermore, the connector 2 is a right-angle connector suitable for aluminum profiles.

[0014] Furthermore, the length direction of the column 1 is perpendicular to the horizontal plane.

[0015] Furthermore, the height range of the push rod when it moves up and down is smaller than the height range of the measuring mechanism when it moves up and down.

[0016] Furthermore, the displacement sensor 4 is an optical grating ruler or a magnetic grating ruler.

[0017] Furthermore, the crossbar 6 is not parallel to the longitudinal bar 7.

[0018] The beneficial technical effects of this utility model are as follows:

[0019] (1) A displacement sensor is used, and through a specially designed connection system, the displacement of the valve stem can be detected in real time with a detection accuracy of ±0.01mm.

[0020] (2) Traditional magnetic fixation methods require the object being attracted to be made of ordinary carbon steel and have a high requirement for a smooth and flat surface, which also carries the risk of scratching the surface of the object. This fixture is equipped with a column, and the connectors on the column can be freely adjusted in height to adapt to installation at any workstation; at the same time, by combining different lengths of crossbars and longitudinal bars, it can be adapted to different specifications of pneumatic control valves or actuators; the crab claw clamp has a rubber pad inside that will not damage the valve stem surface, enabling non-destructive testing.

[0021] (3) Traditional pull-rope displacement sensors are limited by the characteristics of flexible pull ropes, and the measurement error caused by installation tilt can reach more than 5%. After this fixture is installed and locked, the overall connection is rigid, and the measurement error is reduced to less than one-thousandth. Attached Figure Description

[0022] Figure 1 This is a front view of an embodiment;

[0023] Figure 2 This is a top view of an embodiment.

[0024] In the diagram, the correspondence between the component names and the attached drawing numbers is as follows: 1. Column; 2. Connector; 3. Indicator light; 4. Displacement sensor; 5. Crossbar mounting plate; 6. Crossbar; 7. Vertical bar; 8. Crab claw clamp; 9. Torx nut one; 10. Cross fixing joint; 11. Torx nut two; 12. Slide rail; 13. Measuring slider. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] The structure of the embodiment is as follows Figure 1 , 2 As shown, it consists of column 1, connector 2, indicator light 3, displacement sensor 4, crossbar mounting plate 5, crossbar 6, vertical bar 7, crab claw clamp 8, plum blossom hand-tightening nut 1 9, cross fixing section 10, and plum blossom hand-tightening nut 2 11.

[0027] The column 1 is cut from industrial aluminum profile. The connector 2 is a right-angle connector suitable for aluminum profiles, used to fix the column 1 so that the length direction of the column 1 is perpendicular to the horizontal plane.

[0028] The displacement sensor 4 is a grating ruler, including a slide rail 12 and a measuring slider 13. The measuring slider 13 can move linearly on the slide rail 12. The design concept of this embodiment is to select a suitable connecting device to rigidly connect the push rod of the pneumatic control valve or actuator to the measuring slider 13, thereby converting the movement of the push rod into the movement of the measuring slider 13.

[0029] The slide rail 12 is fixed to the column 1, and the length direction of the slide rail 12 is perpendicular to the horizontal plane. The measuring slider 13 can move linearly on the slide rail 12 and can measure the displacement in the direction of movement.

[0030] The crossbar mounting plate 5 is fixed to the measuring slider 13. A double-tightened nut 11 is fixed to the crossbar mounting plate 5. The crossbar 6 is a long rod structure; the double-tightened nut 11 fixes one end of the crossbar 6 to the crossbar mounting plate 5. After fixing, the crossbar 6 is parallel to the horizontal plane.

[0031] The longitudinal rod 7 is a long rod structure. The crab claw clamp 8 is fixed to one end of the longitudinal rod 7 by a plum blossom hand-tightening nut 9. The cross-shaped fixing joint 10 fixes the longitudinal rod 7 to the cross rod 6, so that the longitudinal rod 7 is parallel to the horizontal plane and not parallel to the cross rod 6.

[0032] The horizontal bar mounting plate 5, horizontal bar 6, vertical bar 7, crab claw clamp 8, plum blossom hand-tightening nut 1 9, cross fixing section 10, plum blossom hand-tightening nut 2 11, and measuring slider 13 form a whole, called the measuring mechanism. The measuring mechanism moves linearly along the vertical direction on the slide rail 12.

[0033] After the crab claw clamp 8 clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves up and down along with the push rod. The displacement sensor 4 can measure the displacement of the measuring mechanism. The indicator light 3 is on, indicating that the displacement sensor 4 is operating.

[0034] Before starting the measurement, adjust the installation height of the slide rail 12 according to the height of the push rod so that the height range when the push rod moves up and down is less than the height range when the measuring mechanism moves up and down; otherwise, the push rod or the embodiment may be damaged.

[0035] This embodiment can accurately measure the displacement of the push rod. Only the compressed air pressure needs to be measured to generate a test report that meets national standards.

[0036] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, and for those of ordinary skill in the art, various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details.

Claims

1. A valve displacement measuring instrument for pneumatic control valves or actuators, characterized in that: Includes column (1), connector (2), indicator light (3), displacement sensor (4), crossbar mounting plate (5), crossbar (6), vertical bar (7), crab claw clamp (8), plum blossom hand-tightening nut one (9), cross fixing section (10), plum blossom hand-tightening nut two (11); The column (1) is a long rod structure; the connector (2) is used to fix the column (1); The displacement sensor (4) includes a slide rail (12) and a measuring slider (13); the slide rail (12) is fixed on the column (1), and the length direction of the slide rail (12) is parallel to the length direction of the column (1); the measuring slider (13) moves linearly on the slide rail (12) and measures the displacement in the direction of movement. The crossbar mounting plate (5) is fixed on the measuring slider (13); the second plum blossom hand-tightening nut (11) is fixed on the crossbar mounting plate (5); the crossbar (6) is a long rod structure, and the second plum blossom hand-tightening nut (11) fixes one end of the crossbar (6) to the crossbar mounting plate (5); The longitudinal rod (7) is a long rod structure, and the plum blossom hand-tightening nut (9) fixes the crab claw clamp (8) to one end of the longitudinal rod (7); the cross fixing joint (10) fixes the longitudinal rod (7) to the cross rod (6); The crossbar mounting plate (5), crossbar (6), vertical bar (7), crab claw clamp (8), plum blossom hand-tightening nut one (9), cross fixing section (10), plum blossom hand-tightening nut two (11) and measuring slider (13) form a whole, called the measuring mechanism; the measuring mechanism moves linearly on the slide rail (12); After the crab claw clamp (8) clamps the push rod of the pneumatic control valve or actuator, the measuring mechanism moves in a straight line along with the push rod; the displacement sensor (4) measures the displacement of the measuring mechanism; when the indicator light (3) is off, it means that the displacement sensor (4) has stopped running; when the indicator light (3) is on, it means that the displacement sensor (4) is running.

2. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 1, wherein, The column (1) is cut from industrial aluminum profiles.

3. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 1, wherein, The connector (2) is a right-angle connector suitable for aluminum profiles.

4. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 1, wherein, The length direction of the column (1) is perpendicular to the horizontal plane.

5. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 4 wherein, The height range of the push rod when it moves up and down is less than the height range of the measuring mechanism when it moves up and down.

6. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 1 wherein, The displacement sensor (4) is an optical grating ruler or a magnetic grating ruler.

7. A valve positioner for use with a pneumatic control valve or actuator as defined in claim 1 wherein, The horizontal bar (6) is not parallel to the vertical bar (7).

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