Partial stroke testing device

Abstract

The utility model discloses a partial stroke testing device. The partial stroke testing device comprises a testing support, a driving shaft and a testing assembly. A first chamber and a second chamber which are communicated with each other are formed in the test bracket; the testing assembly comprises a driving shaft and a testing rotating shaft, one end of the driving shaft is connected with the valve body actuator, and the other end of the driving shaft extends into the second cavity; the driving shaft located in the second chamber is provided with a first testing part along the axial direction of the driving shaft; the test rotating shaft is arranged in the second chamber; the axis of the driving shaft intersects with the axis of the test rotating shaft, and the test rotating shaft is provided with a second test part. According to the structure, partial stroke testing is achieved through mechanical limiting, the actuator, the valve and the partial stroke testing Zhuhan are matched, automatic detection of the actuator on valve faults is achieved, and therefore the valve faults can be found and eliminated in time. Partial stroke testing of the valve can be completed without a positioner, and mechanical limiting is more stable and accurate.

Description

Technical Field

[0001] The utility model relates to the technical field of valve stroke testing, in particular to a partial stroke testing device. Background Art

[0002] In order to ensure safe production, more and more factories have introduced safety instrument systems (SIS). The key technology among them is the emergency cut-off switch valve. The safety and reliability test of the ESD switch valve is completed through partial stroke testing to ensure the safety inspection of the ESD switch valve without stopping production of the production line.

[0003] Partial stroke testing means that the valve performs partial stroke movement under the condition of not affecting the normal operation of the factory, so as to prove the integrity of the valve. This kind of on-line testing ensures that the factory can diagnose the health status of the valve during normal operation without stopping. Through partial stroke testing, various qualitative and quantitative analyses can be carried out on the ESD switch valve, such as diaphragm head pressure, pressure difference, spring range and response time, etc. By integrating and processing these data through software, a trend chart of valve position-pressure change in the valve PST test can be obtained.

[0004] However, when performing PST testing on the existing single-acting actuator, an internal positioner needs to be used. If the internal positioner is damaged, the stroke test cannot be carried out. Summary of the Utility Model

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the defect that when performing PST testing on the existing single-acting actuator, an internal positioner needs to be used. If the internal positioner is damaged, the stroke test cannot be carried out.

[0006] For this reason, the utility model provides a partial stroke testing device, comprising:

[0007] A test bracket, in which a first chamber and a second chamber communicating with each other are provided.

[0008] A test assembly, the test assembly includes a drive shaft and a test rotating shaft. One end of the drive shaft is connected to the valve body actuator, and the other end of the drive shaft extends into the second chamber. A first test portion is provided on the drive shaft located in the second chamber along its axial direction. The test rotating shaft is arranged in the second chamber.

[0009] Wherein, the axis of the drive shaft intersects with the axis of the test rotating shaft. A second test portion is provided on the test rotating shaft. The second test portion has a test state in which it abuts against the first test portion when the first test portion rotates following the drive shaft to stop the drive shaft from rotating.

[0010] Optionally, the above-mentioned first test part is in the shape of a groove. The first test part includes a first test surface and a second test surface, and the first test surface and the second test surface are connected at an obtuse angle.

[0011] When the second test part is in the test state, the first test surface can abut against the second test part.

[0012] Optionally, the above-mentioned second test part is in the shape of a groove. The second test part includes a third test surface.

[0013] When the second test part is in the test state, the first test surface can abut against the third test surface.

[0014] Optionally, the above-mentioned test rotating shaft further includes a full open slot, and the full open slot is arranged at an interval from the second test part.

[0015] When the full open slot is facing the drive shaft, the shortest distance from any point on the inner wall of the full open slot to the central axis of the drive shaft is greater than the radius of the circular surface formed by the radial cross-section of the drive shaft.

[0016] Optionally, the outer wall surface of the above-mentioned test bracket is provided with a first groove and a second groove. The first groove and the second groove are arranged at an interval, and a fixing part is formed between the first groove and the second groove.

[0017] A fixing structure is installed in the first groove, and one end of the test rotating shaft is installed on the fixing structure.

[0018] Optionally, the above-mentioned fixing structure includes:

[0019] A fixing plate, the fixing plate is installed on the side wall of the first groove. An installation hole is opened on the fixing plate, and one end of the test rotating shaft penetrates through the side wall of the test bracket and is inserted into the installation hole.

[0020] A fixing piece, the fixing piece is inserted into the side surface of the fixing plate, and the fixing piece can abut against the outer surface of the test rotating shaft to fix the test rotating shaft.

[0021] Optionally, the above-mentioned fixing structure further includes a retaining ring, and the retaining ring is arranged at the connection position of the test rotating shaft and the installation hole.

[0022] Optionally, the above-mentioned test assembly further includes a connecting rod, and the connecting rod is sleeved on the test rotating shaft located in the first groove. Under the action of an external force, the connecting rod can be driven to drive the test rotating shaft to rotate.

[0023] Optionally, a limiting piece is further installed on the above-mentioned fixing plate, and the connecting rod can abut against the limiting piece to reach the test position.

[0024] Optionally, the above partial stroke test device further includes a limit switch, which is installed in the second groove, and one end of the limit switch passes through the fixing part and extends into the first groove, and an induction block is installed at one end of the limit switch close to the first groove.

[0025] The technical solution provided by the present utility model has the following advantages:

[0026] 1. A partial stroke test device provided by the present utility model includes: a test bracket, a drive shaft, and a test assembly. A first chamber and a second chamber communicating with each other are provided in the test bracket; the test assembly includes a drive shaft and a test rotating shaft, one end of the drive shaft is connected to a valve body actuator, and the other end of the drive shaft extends into the second chamber; a first test portion is provided on the drive shaft located in the second chamber along its axial direction; the test rotating shaft is arranged in the second chamber; the axis of the drive shaft intersects with the axis of the test rotating shaft, and a second test portion is provided on the test rotating shaft, and the second test portion has a test state in which it abuts against the first test portion when the first test portion rotates following the drive shaft to stop the drive shaft from rotating.

[0027] This structure realizes partial stroke testing by using mechanical limit. The actuator, the valve, and the partial stroke test device cooperate to realize the autonomous detection of valve faults by the actuator, which is beneficial to timely discover and eliminate valve faults. And the partial stroke test of the valve can be completed without a positioner, and the use of mechanical limit is more stable and accurate. Description of the Drawings

[0028] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0029] Figure 1 It is a schematic diagram of the overall structure of the partial stroke test device provided in the present utility model;

[0030] Figure 2 It is a positive half-sectional view of the partial stroke test device provided in the present utility model;

[0031] Figure 3 It is a schematic diagram of the internal structure of the top view of the partial stroke test device provided in the present utility model when the formation test is not performed;

[0032] Figure 4 It is a schematic diagram of the internal structure of the top view of the partial stroke test device provided in the present utility model when the formation test is performed;

[0033] Description of the reference numerals:

[0034] 1 - Test bracket; 11 - First chamber; 12 - Second chamber; 13 - First groove; 14 - Second groove; 15 - Fixing part

[0035] 2 - Test component; 21 - Driving shaft; 22 - First test part; 221 - First test surface; 222 - Second test surface; 23 - Test rotating shaft; 231 - Second test part; 232 - Third test surface; 233 - Full opening groove; 24 - Connecting rod

[0036] 3 - Fixing structure; 31 - Fixing plate; 32 - Fixing piece; 33 - Retaining ring

[0037] 4 - Limiting piece

[0038] 5 - Limit switch

[0039] 6 - Inductive block Detailed implementation manners

[0040] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0041] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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 to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0043] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0044] Embodiment

[0045] This embodiment provides a partial stroke testing device, as Figures 1 to 4 shown, including: a testing bracket 1, a driving shaft 21 and a testing component 2. As Figure 1 and Figure 3 shown, a first chamber 11 and a second chamber 12 which are communicated with each other are provided in the testing bracket 1. The first chamber 11 is a cylindrical chamber, and the central axis of the first chamber 11 coincides with the central axis of the testing bracket 1. The main body of the second chamber 12 is also a cylindrical chamber, and the central axis of the second chamber 12 coincides with the central axis of the testing bracket 1 and is arranged adjacent to the first chamber 11. The first chamber 11 is communicated with the second chamber 12. A first groove 13 and a second groove 14 are provided on the outer side of the testing bracket 1. The first groove 13 and the second groove 14 are arranged at intervals. The first groove 13 corresponds to the second chamber 12, and the testing bracket 1 between the first groove 13 and the second groove 14 is a fixing part 15. An installation flange is fixed at the top of the testing bracket 1, and a through hole is also provided in the center of the installation flange, and this through hole is communicated with the first chamber 11.

[0046] As Figure 1 and Figure 2 shown, a fixing structure 3 is installed on the side surface of the first groove 13 close to the second chamber 12. The fixing structure 3 includes: a fixing plate 31, a fixing member 32 and a retaining ring 33. Screw holes are provided at the four corners of the fixing plate 31, and the fixing plate 31 is fixed on the side surface of the first groove 13 close to the second chamber 12 by screws or bolts. A fixing hole is provided in the center of the fixing plate 31, and the axis line of the fixing hole coincides with the central axis of the second chamber 12. A threaded hole is provided on the side surface of the fixing plate 31, and this threaded hole is communicated with the fixing hole. A fixing member 32 is arranged in the threaded hole, and the fixing member 32 is a bolt.

[0047] As Figures 1 to 4 shown, the testing component 2 includes a driving shaft 21 and a testing rotating shaft 23. The driving shaft 21 is vertically placed in the first chamber 11. A bearing is installed at the lower end of the driving shaft 21, and the outer ring of the bearing is fixed on the side wall of the first chamber 11. The end of the driving shaft 21 passes through the upper end of the testing bracket 1 and the through hole and extends to the outside. A first testing part 22 is provided on the side surface of the driving shaft 21 in the axial direction. The first testing part 22 is in a groove shape. The first testing part 22 includes a first testing surface 221 and a second testing surface 222. The first testing surface 221 and the second testing surface 222 are connected at an obtuse angle. As Figure 3 shown, the first testing surface 221 is the surface with a shorter width, and the second testing surface 222 is the surface with a wider width.

[0048] As Figure 3 and Figure 4 shown, a test rotating shaft 23 is placed on a test rotating shaft 23, and a second test portion 231 and a full-open slot 233 are provided thereon. Both the second test portion 231 and the full-open slot 233 are provided along the axial direction of the test rotating shaft 23, and the second test portion 231 and the full-open slot 233 are arranged at intervals on the side of the second test portion 231. Both the second test portion 231 and the full-open slot 233 are in the shape of a groove. Along the axial direction of the test rotating shaft 23, the length of the second test portion 231 is less than the length of the full-open slot 233. When the full-open slot 233 is directly opposite to the driving shaft 21, the shortest distance from any point on the inner wall of the full-open slot 233 to the central axis of the driving shaft 21 is greater than the radius of the circular surface formed by the radial cross-section of the driving shaft 21. The side of the second test portion 231 away from the fixing plate 31 is a third test surface 232. When the opening of the third test portion is directly opposite to the driving shaft 21, the shortest distance from any point on at least part of the outer side of the third test surface 232 to the central axis of the driving shaft 21 is less than the radius of the circular surface formed by the radial cross-section of the driving shaft 21.

[0049] By providing the second test portion 231 and the full-open slot 233, it is avoided that after installing part of the stroke test device on the valve, the normal use of the valve is affected. And there is no need to repeatedly disassemble and install, reducing the test time and cost.

[0050] One end of the test rotating shaft 23 close to the first groove 13 passes through the test bracket 1 and is placed in a fixing hole. A retaining ring 33 is installed in the fixing hole. The retaining ring 33 is sleeved on the test rotating shaft 23 and is used to prevent the test rotating shaft 23 from moving out of the second chamber 12. The test assembly 2 further includes a connecting rod 24, and the connecting rod 24 is penetrated through the test rotating shaft 23 located in the first groove 13. A limiting member 4 is further installed on the fixing plate 31. The part-stroke test device further includes a limit switch 5. The limit switch 5 is installed in the second groove 14, and one end of the limit switch 5 passes through the fixing portion 15 and extends into the first groove 13. An induction block 6 is installed at the end of the limit switch 5 close to the first groove 13. The other end of the limit switch 5 is installed with a gland for connecting to an external valve actuator through a cable.

[0051] Before the stroke test, it is necessary to install this stroke test device on the valve actuator. At this time, the entire stroke test device is installed on the valve actuator through the flange at the top of the test bracket 1, and the upper end of the driving shaft 21 is connected to the output end of the actuator. Under normal conditions, it is necessary to rotate the connecting rod 24 to a vertical state. At this time, the rotation of the connecting rod 24 drives the test rotating shaft 23 to rotate so that the full-open slot 233 is directly opposite to the driving shaft 21. The induction block 6 cannot sense the connecting rod 24, and the limit switch 5 transmits a signal to the actuator. At this time, the valve can work normally. During the opening and closing process of the valve, the driving shaft 21 is driven to rotate and will not touch the test rotating shaft 23.

[0052] When a stroke test is required, first control the valve actuator to move the valve to the fully open position. When the valve is in the fully open position, the valve can rotate freely. For example, Figure 3 , from the perspective of the cross-section in the top view, the first test surface 221 is inclined, while the second test surface 222 is vertical.

[0053] Next, move the fixing member 32 to make the fixing member 32 away from the test rotating shaft 23. Rotate the connecting rod counterclockwise by 90 degrees with the axis of the test rotating shaft 23 as the center, and abut the connecting rod 24 against the position of the limiting member 4 to make the connecting rod 24 horizontal. Then rotate the fixing member 32 closer to the test rotating shaft 23 to fix it, preventing the test rotating shaft 23 from shifting during the formation test. At this time, the first test portion 22 on the test rotating shaft 23 is facing the driving shaft 21. After the limit switch 5 senses the connecting rod 24 and sends a signal, the central control closes the valve. The driving shaft 21 rotates clockwise, and the first test portion 22 also rotates clockwise with the central axis of the driving shaft 21 as the center until the first test surface 221 abuts against the third test surface 232. The valve cannot move further. For example, Figure 4 , from the perspective of the cross-section in the top view, the first test surface 221 and the third test surface 232 are horizontal, while the second test surface 222 is in an inclined state. By comparing the valve movement angle monitored by the valve itself, it is judged whether this part of the stroke test device is qualified. For example: from the fully open position of the valve to being stopped by the limit, the mechanically limited valve can move to 72 degrees. At this time, the valve movement angle detected by the valve itself should also be 72 degrees. If so, the formation test is qualified; if not, it is unqualified.

[0054] If the valve is unqualified, it needs to be disassembled, replaced or repaired. If it is qualified, return the valve to the fully open position, make the fixing member 32 away from the test rotating shaft 23, rotate the connecting rod clockwise by 90 degrees with the axis of the test rotating shaft 23 as the center to make the connecting rod 24 vertical until the fully open groove 233 is facing the driving shaft 21, and rotate the fixing member 32 closer to the test rotation to fix it again. The valve can rotate freely.

[0055] In the above process, the partial stroke test is realized by mechanical limit. The actuator, the valve and the partial stroke test device cooperate to realize the autonomous detection of valve faults by the actuator, which is beneficial to timely discover and eliminate valve faults. And the partial stroke test of the valve can be completed without a positioner, and the use of mechanical limit is more stable and accurate.

[0056] Obviously, the above embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the utility model.

Claims

1. A partial stroke test device, characterized in that, Comprising: A test bracket (1), in which a first chamber (11) and a second chamber (12) communicating with each other are formed; A test assembly (2), the test assembly (2) includes a drive shaft (21) and a test rotating shaft (23), one end of the drive shaft (21) is connected to a valve body actuator, and the other end of the drive shaft (21) extends into the second chamber (12); a first test portion (22) is formed along the axial direction of the drive shaft (21) located in the second chamber (12); the test rotating shaft (23) is arranged in the second chamber (12); Wherein, the axis of the drive shaft (21) intersects with the axis of the test rotating shaft (23), a second test portion (231) is formed on the test rotating shaft (23), and the second test portion (231) has a test state in which it abuts against the first test portion (22) when the first test portion (22) rotates following the drive shaft (21) to stop the drive shaft (21) from rotating.

2. The partial stroke testing device according to claim 1, characterized in that, The first test portion (22) is in the shape of a groove, the first test portion (22) includes a first test surface (221) and a second test surface (222), and the first test surface (221) and the second test surface (222) are connected at an obtuse angle; When the second test portion (231) is in the test state, the first test surface (221) can abut against the second test portion (231).

3. The partial stroke test device according to claim 2, wherein The second test portion (231) is in the shape of a groove, and the second test portion (231) includes a third test surface (232); When the second test portion (231) is in the test state, the first test surface (221) can abut against the third test surface (232).

4. The partial stroke testing device according to claim 3, characterized in that, The test rotating shaft (23) further includes a full-open groove (233), and the full-open groove (233) is arranged at an interval from the second test portion (231); When the full-open groove (233) is aligned with the drive shaft (21), the shortest distance from any point on the inner wall of the full-open groove (233) to the central axis of the drive shaft (21) is greater than the radius of the circular surface formed by the radial cross-section of the drive shaft (21).

5. The partial stroke test device according to any one of claims 1-4, characterized in that, A first groove (13) and a second groove (14) are formed on the outer wall surface of the test bracket (1), the first groove (13) and the second groove (14) are arranged at an interval, and a fixing portion (15) is formed between the first groove (13) and the second groove (14); A fixing structure (3) is installed in the first groove (13), and one end of the test rotating shaft (23) is installed on the fixing structure (3).

6. The partial stroke test device according to claim 5, characterized in that, The fixing structure (3) includes: A fixing plate (31), the fixing plate (31) is installed on the side wall of the first groove (13), an installation hole is formed on the fixing plate (31), and one end of the test rotating shaft (23) penetrates through the side wall of the test bracket (1) and is inserted into the installation hole; A fixing member (32), the fixing member (32) is inserted on the side surface of the fixing plate (31), and the fixing member (32) can abut against the outer surface of the test rotating shaft (23) to fix the test rotating shaft (23).

7. The partial stroke test device according to claim 6, characterized in that, The fixing structure (3) further includes a retaining ring (33), and the retaining ring (33) is arranged at the connection position between the test rotating shaft (23) and the mounting hole.

8. The partial stroke testing device according to claim 6, wherein The test assembly (2) further includes a connecting rod (24), the connecting rod (24) is sleeved on the test rotating shaft (23) located in the first groove (13), and under the action of an external force, the connecting rod (24) can be driven to drive the test rotating shaft (23) to rotate.

9. The partial stroke test device according to claim 8, wherein, A limiting member (4) is further installed on the fixing plate (31), and the connecting rod (24) can abut against the limiting member (4) to reach the test position.

10. The partial stroke test device according to claim 8, wherein, The partial stroke test device further includes a limit switch (5), the limit switch (5) is installed in the second groove (14), and one end of the limit switch (5) extends through the fixing portion (15) into the first groove (13), and an induction block (6) is installed at the end of the limit switch (5) close to the first groove (13).

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