CN116296352A - Pneumatic regulating valve viscous fault test device and test analysis method thereof - Google Patents
Pneumatic regulating valve viscous fault test device and test analysis method thereof Download PDFInfo
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Abstract
The invention discloses a viscous fault test device of a pneumatic regulating valve and a test analysis method thereof, and relates to the technical field of valve equipment. The viscous fault generating device of the test device comprises a left clamping block, a right clamping block and a friction rod, wherein the friction force borne by the friction rod can be changed by adjusting the clamping block, the clamping block can move along a chute formed by the support frame and the compression cover, and the friction force is indirectly represented by collecting the stress condition of the force transmission rod through the thrust sensor. The invention can obtain the controller output curve, valve position curve, friction force curve and dynamic and static friction force f of the whole actuating mechanism action process by the proposed test analysis method d 、f s The nonlinear characteristics of viscous faults can be fully reflected. Based on the data, the viscosity mechanism of the regulating valve can be studied for verifying the reliability of different viscosity models. Besides, the method can be used for researching fault diagnosis of the viscosity characteristic of the pneumatic adjusting valve and a compensation method thereof.
Description
Technical Field
The invention belongs to the field of valve test devices, and particularly relates to a pneumatic control valve viscous fault test device and a test analysis method thereof.
Background
The pneumatic regulating valve is the most commonly used actuating mechanism in the industrial loop, but due to ageing and other problems, the friction force between a sealing element and a valve rod is often too large, sudden jump, namely viscous fault, occurs before the valve rod slides, so that the loop has oscillation phenomenon, and further the product quality, the system energy consumption and the factory profit are influenced. Therefore, the method is particularly important to research the mechanism of viscous fault generation, establish a reliable viscous model and research the fault diagnosis and compensation method of the viscous characteristic of the pneumatic regulating valve. The above-mentioned researches are currently carried out mostly by using a data-driven method, namely, various parameter data when the pneumatic control valve has viscous faults are needed. Since viscous faults are mainly that the valve position of an actuator cannot be linearly changed according to the signal of a controller due to friction, the valve position signal and the output signal of the controller are important data for reflecting the viscous faults. At present, a device and a mode for acquiring the data by changing the viscous fault degree, namely the friction force through a test device are mostly too complicated, for example, a strain gauge is required to be installed on the friction force or the friction coefficient of a friction pair is known in advance, and a method for changing the friction force is mostly uncontrollable and easily damages a valve rod, for example, the problems of abrasion, eccentricity and the like of the valve rod can be caused. Therefore, how to effectively and controllably change the viscous fault degree of the regulating valve on the premise of not damaging the actuating mechanism and quickly and conveniently obtain important data of the friction force, valve position signals, controller output signals and the like for reflecting viscous faults is a problem to be solved nowadays.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a viscous fault test device of a pneumatic control valve and a test analysis method thereof.
The specific technical scheme adopted by the invention is as follows:
the invention provides a device for testing the viscous fault of a pneumatic regulating valve, which comprises a pneumatic film actuator, a positioner, a data acquisition card, a controller, an upper computer and a viscous fault generating device;
the viscous fault generating device comprises a left clamping block, a right clamping block and a friction rod; a vertical friction rod is clamped between the left clamping block and the right clamping block, and the left clamping block and the right clamping block are positioned on the same horizontal plane and are symmetrically distributed relative to the axial direction of the friction rod; the friction elastic rings are arranged at the contact positions of the left clamping block and the right clamping block and the friction rod, and the friction rod can vertically slide relative to the friction elastic rings; the horizontal clamping force of the friction rod can be changed between the left clamping block and the right clamping block through the adjusting piece, and the upper part of the friction rod is fixedly connected with the lower part of the valve rod of the pneumatic film actuator in a coaxial and detachable mode; the outer end parts of the left clamping block and the right clamping block are respectively arranged at the top parts of the two supporting frames, the two outer end parts can be detachably fixed on the supporting frames through the compression covers respectively, and the vertical pressure applied to the outer end parts can be adjusted through the compression covers; a sliding groove which is used for placing the outer end part and can provide one degree of freedom for sliding in the horizontal direction of the clamping block is formed between the compression cover and the supporting frame; the two support frame tops all are fixed with the thrust sensing device that can contact with the outer tip bottom surface that corresponds, thrust sensing device links to each other with the input of data acquisition card respectively, and the output of controller links to each other with the input of data acquisition card and locator respectively, and the output of locator links to each other with the input of data acquisition card, and the output of data acquisition card links to each other with the host computer.
Preferably, the friction rod is connected with the valve rod through threads.
Preferably, the left clamping block and the right clamping block each comprise a clamping end, a force transmission rod and an outer end; the clamping end is used for clamping the friction rod, and an arc-shaped groove used for placing the friction rod and the friction elastic ring is formed in one side, close to the friction rod; the clamping end of the left clamping block is provided with a plurality of through bolt grooves along the circumferential direction, the clamping end of the right clamping block is provided with a plurality of through hole grooves along the circumferential direction, and the number and the positions of the bolt grooves and the through hole grooves are corresponding; the adjusting piece comprises a locking bolt and a locking nut, and the locking bolt can sequentially pass through the bolt groove and the through hole groove and is screwed and fixed through the locking nut.
Further, protruding locating parts are arranged at the top and the bottom of the arc-shaped groove, and the locating parts are used for preventing the friction elastic ring from moving up and down.
Preferably, the friction elastic ring is detachably sleeved outside the friction rod, and the friction elastic ring is made of rubber, carbon fiber or flexible graphite.
Preferably, the supporting frame is vertically fixed on the supporting base, and the supporting base can be fixed on the ground through a plurality of foundation bolts distributed circumferentially.
Further, a plurality of through bolt holes are formed in the circumference of the pressing cover, and the pressing cover is fixed to the support frame through the through bolt holes of the pressing bolt so as to provide pretightening force for the thrust sensor device, so that the stress direction of the thrust sensor device is kept vertically downwards.
Further, the pneumatic film actuator and the positioner are both fixed on the support base through the support frame.
In a second aspect, the present invention provides a test analysis method using the pneumatic control valve adhesion failure test apparatus according to any one of the first aspect, specifically including:
s1: before the test starts, the pneumatic film actuator is arranged on the viscous fault generating device, so that the friction rod and the valve rod are ensured not to be eccentric; the horizontal clamping force of the left clamping block and the right clamping block on the friction rod is changed through the adjusting piece, so that positive pressure is generated on the friction rod, and the friction force between the friction rod and the friction elastic ring after the test starts can be enough so as to reflect the nonlinear characteristic of viscous faults; the pressing cover is adjusted to provide pretightening force for the thrust sensor device, so that the stress direction of the thrust sensor device is kept vertically downward; one path of signals of the two thrust sensor devices is connected to an AI0 input channel of the data acquisition card, and the other path of signals of the two thrust sensor devices is connected to an AI1 input channel of the data acquisition card; one path of the controller output signal OP is connected to the locator, and the other path is connected to the AI2 input channel of the data acquisition card; the valve position signal MV output by the locator is connected to the AI3 input channel of the data acquisition card;
s2: when the test starts, a controller is utilized to output a control signal OP of a sine function, so that the valve rod can realize up-and-down reciprocating motion; when the control signal OP begins to increase and the valve rod has a downward movement trend, the left clamping block and the right clamping block are subjected to vertical downward force to have a pretightening force F for pressing the cover to the thrust sensor Left compression And F Right pressing Friction force F, self gravity G, supporting force F provided by the thrust sensor device under vertical upward force Left side And F Right side The method comprises the steps of carrying out a first treatment on the surface of the As can be seen from the force balance, the resultant force of the supporting forces F=F measured by the two thrust sensor devices Left compression +F Right pressing +g+f, where f=f Left side +F Right side The method comprises the steps of carrying out a first treatment on the surface of the Let F initial ＝F Left compression +F Right pressing +g, then f=f initial +f; when the test is started, the friction rod and the friction elastic ring do not move relatively, the friction force f is increased along with the increase of the control signal OP, and when the thrust of the valve rod is greater than the maximum static friction force f s When the valve rod and the friction rod start to move downwards, the friction force f reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged; when the control signal OP begins to decrease and the valve rod has a trend of upward movement, the directions of friction forces born by the left clamping block and the right clamping block are changed to be vertical upward, and the resultant force F=F of supporting forces measured by the two thrust force sensing devices initial F, when the friction force f likewise reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged; repeating the above process under the action of a periodic control signal OP;
s3: after the test is finished, the OP, MV and F can be obtained by utilizing the data acquisition card Left side And F Right side The signal is transmitted to the upper computer; on the upper computer to F Left side And F Right side The signals are combined to obtain an F-t curve, and the F-t curve is shifted down by F initial The size becomes an f-t curve, and f is obtained by summing the absolute values of different wave peaks and wave troughs of f-t and taking an average value s By maintaining at f in the f-t curve d Summing absolute values of nearby data and taking average value to obtain f d The OP-t curve can be obtained through the controller, and the MV-t curve can be obtained through the locator; and taking MV as an ordinate and OP as an abscissa, so as to obtain an MV-OP curve.
Preferably, the pre-tightening force F on the left and right sides is changed Left compression And F Right pressing F is made to initial >f s 。
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the viscous fault generating device can effectively and controllably change the viscous fault degree of the regulating valve on the premise of not damaging the actuating mechanism, so that friction forces with different magnitudes are generated, and the friction force between the valve rod and the sealing component in practice is simulated; the controller output curve, the valve position curve, the friction force curve and the dynamic and static friction force f of the whole action process of the actuating mechanism can be quickly and conveniently obtained through the proposed test analysis method d 、f s The friction coefficient of the friction pair does not need to be known in advance, so that the nonlinear characteristic of viscous faults can be fully reflected; the test device can be used for researching the viscosity mechanism of the regulating valve and is used for verifying the reliability of different viscosity models. Besides, the method can be used for researching fault diagnosis of the viscosity characteristic of the pneumatic adjusting valve and a compensation method thereof.
Drawings
FIG. 1 is a general diagram of a pneumatic regulator viscous fault test apparatus;
FIG. 2 is a cross-sectional view of a viscous fault generating device;
FIG. 3 is a three-dimensional view of a viscous fault generating device;
FIG. 4 is a three-dimensional view of a left clamp block;
FIG. 5 is a diagram of a clamp block force analysis;
FIG. 6 is a process control system;
FIG. 7 shows a force variation curve, (a) shows a force F applied by a thrust sensor with respect to time t, and (b) shows a friction force F applied by a valve rod with respect to time t;
fig. 8 is a diagram of the overall architecture of the test system.
In the figure: 1. an anchor bolt; 2. a support base; 3. a thrust sensing device; 4. a right clamping block; 5. a pressing cover; 6. a locking bolt; 7. a lock nut; 8. a friction lever; 9. a friction elastic ring; 10. a left clamping block; 11. a compression bolt; 12. a valve stem; 1001. a bolt slot; 1002. an arc-shaped groove; 1003. a force transmission lever; 8-01, a positioner; 8-02, a controller; 8-03, a left push force sensor; 8-04, right push force sensor; 8-05, a data acquisition card; 8-06, an upper computer.
Detailed Description
The invention is further illustrated and described below with reference to the drawings and detailed description. The technical features of the embodiments of the invention can be combined correspondingly on the premise of no mutual conflict.
As shown in FIG. 1, the invention provides a viscous fault test device for a pneumatic control valve, which mainly comprises a pneumatic film actuator, a positioner 8-01, a data acquisition card 8-05, a controller 8-02, an upper computer 8-06 and a viscous fault generating device. The pneumatic film actuator is an existing mechanism, and the structure and the connection mode of the viscous fault generating device are mainly described in detail below.
As shown in fig. 2 and 3, the viscous fault generating device mainly includes a left clamp block 10, a right clamp block 4, and a friction lever 8. The friction rod 8 is clamped between the left clamping block 10 and the right clamping block 4, the friction rod 8 is arranged vertically, and the left clamping block 10 and the right clamping block 4 are located on the same horizontal plane and are distributed symmetrically relative to the friction rod 8 in the axial direction.
In this embodiment, the left clamping block 10 and the right clamping block 4 may adopt a transverse T-shaped structure, including a vertical section and a horizontal section; wherein the vertical section serves as a clamping end for clamping the friction lever 8, and the horizontal section comprises a force transmission lever 1003 of the main body and an outer end remote from the clamping end.
In the viscous fault generating device, a friction elastic ring 9 is arranged at the contact part of the left clamping block 10 and the right clamping block 4 and the friction rod 8, and the friction rod 8 can vertically slide relative to the friction elastic ring 9. In this embodiment, the friction elastic ring 9 may be sleeved outside the friction rod 8, and then clamped and fixed by the left clamping block 10 and the right clamping block 4. The left clamping block 10 and the right clamping block 4 are detachably fixed through the adjusting piece, and the horizontal clamping force of the friction rod 8 can be changed through the adjusting piece. The upper part of the friction rod 8 is fixedly connected with the lower part of the valve rod 12 of the pneumatic film actuator in a coaxial and detachable way. In this embodiment, the friction rod 8 and the valve rod 12 can be connected through threads, and the connection mode ensures that the friction rod 8 and the valve rod 12 synchronously move in the same vertical direction, no eccentricity occurs, and friction force does not directly act on the valve rod 12 but acts on the friction rod 8 so as to prevent the valve rod 12 from being worn.
In the present embodiment, as shown in fig. 4, in the clamping ends of the left and right clamping blocks 10 and 4, an arc-shaped groove 1002 for placing the friction lever 8 and the friction elastic ring 9 is provided on the side adjacent to the friction lever 8. The clamping end of the left clamping block 10 is provided with a plurality of (4 in this embodiment) through bolt grooves 1001 along the circumferential direction, and the clamping end of the right clamping block 4 is provided with a plurality of (4 in this embodiment) through hole grooves along the circumferential direction, wherein the number and positions of the bolt grooves 1001 and the through hole grooves are corresponding. The adjusting member includes a lock bolt 6 and a lock nut 7, and the lock bolt 6 can pass through the bolt groove 1001 and the through hole groove in order and be fastened by tightening the lock nut 7. In actual use, the contact pressure between the friction elastic ring 9 and the friction rod 8 is changed by rotating the four lock nuts 7 on the right clamping block 4, so that the adjustable friction force is realized. The locking bolt 6 is clamped through the bolt groove 1001, the locking bolt 6 is driven to rotate when the locking nut 7 is prevented from rotating, the friction elastic ring 9 can be clamped through the arc-shaped groove 1002, the friction elastic ring 9, the left clamping block 10 and the right clamping block 4 are prevented from generating relative motion in the vertical direction, and only the friction rod 8 is guaranteed to slide in the vertical direction. The friction force applied to the friction lever 8 in the vertical direction is transmitted to the thrust sensor device 3 by the force transmission lever 1003. Protruding limiting pieces are arranged at the top and the bottom of the arc-shaped groove 1002 and used for preventing the friction elastic ring 9 from moving up and down.
In this embodiment, the friction elastic ring 9 is detachably sleeved outside the friction rod 8, and the friction rod 8 is made of elastic materials such as rubber, carbon fiber, flexible graphite, etc., so that the friction rod 8 is not easy to be completely blocked, and the service life of the friction rod 8 is prolonged. When the friction elastic ring 9 and the friction rod 8 are worn seriously in use and cannot provide large friction force, the friction elastic ring can be detached and replaced.
In the viscous fault generating device, the outer ends of the left clamping block 10 and the right clamping block 4 are respectively arranged at the tops of two supporting frames, the two outer ends can be detachably fixed on the supporting frames through the pressing cover 5, and the vertical pressure applied to the outer ends can be adjusted through the pressing cover 5. In the embodiment, four bolt holes are circumferentially arranged on the compression cover 5, and the compression force transmission rod 1003 and the thrust sensor 3 are compressed through the compression bolt 11 and the compression cover 5 to provide pretightening force for the thrust sensor 3, so that the direction of the stress on the thrust sensor 3 is unchanged, and the stress is always vertically downward.
In the viscous fault generating device, a sliding groove is formed between the pressing cover 5 and the supporting frame, and the sliding groove can be used for placing the outer end part and providing a degree of freedom sliding for the horizontal direction of the clamping block. The top of the two supporting frames are respectively fixed with a thrust sensor 3 (namely a left thrust sensor 8-03 and a right thrust sensor 8-04) which can be contacted with the bottom surface of the corresponding outer end part, the thrust sensor 3 is respectively connected with the input end of a data acquisition card 8-05, the output end of a controller 8-02 is respectively connected with the input ends of the data acquisition card 8-05 and a positioner 8-01, the output end of the positioner 8-01 is connected with the input end of the data acquisition card 8-05, and the output end of the data acquisition card 8-05 is connected with an upper computer 8-06. In practice, the force transmission rod 1003 can move along the sliding groove formed by the supporting frame and the pressing cover 5. When the magnitude of the friction force is changed, the horizontal relative positions of the left clamping block 10 and the right clamping block 4 are required to be changed, and the sliding groove provides one degree of freedom for the horizontal direction of the clamping blocks, so that the force transmission rod 1003 can move horizontally and freely when the lock nut 7 is rotated.
When practical application, the support frame is vertically fixed on supporting base 2, and supporting base 2 can be fixed in subaerial through a plurality of rag bolts 1 that circumference laid. The pneumatic film actuator and the positioner 8-01 can also be both fixed on the support base 2 through a support frame.
As shown in fig. 5-8, the test analysis method provided by the invention is that using the above-mentioned pneumatic control valve adhesion fault test device, specifically as follows:
s1: before the test starts, the pneumatic film actuator is installed on the viscous fault generating device, so that the friction rod 8 and the valve rod 12 are ensured not to be eccentric. The horizontal clamping force of the left clamping block 10 and the right clamping block 4 on the friction rod 8 is changed by rotating the lock nut 7, so that positive pressure is generated on the friction rod 8, and the friction force between the friction rod 8 and the friction elastic ring 9 after the test starts is ensured to be large enough to reflect the nonlinear characteristic of viscous faults. By rotating the compression bolt 11, a pretightening force is provided for the thrust sensor device 3, so that the stress direction of the thrust sensor device 3 is kept vertically downward. One path of signals of the two thrust sensor devices 3 is connected to an AI0 input channel of the data acquisition card 8-05, and the other path is connected to an AI1 input channel of the data acquisition card 8-05. Specifically, the right push sensor 8-04 is connected to the AI0 input channel of the data acquisition card 8-05 in one path, and the left push sensor 8-03 is connected to the AI1 input channel of the data acquisition card 8-05. One path of the output signal OP of the controller 8-02 is connected to the locator 8-01, and the other path is connected to the AI2 input channel of the data acquisition card 8-05. The valve position signal MV output by the positioner 8-01 is connected to the AI3 input channel of the data acquisition card 8-05.
S2: at the beginning of the test, the controller 8-02 outputs a sinusoidal control signal OP to cause the valve stem 12 to reciprocate up and down. When the control signal OP starts to increase and the valve rod 12 tends to move downwards, the left clamping block 10 and the right clamping block 4 are subjected to vertical downward force to exert the pretightening force F for pressing the cover 5 on the thrust sensor device 3 Left compression And F Right pressing Friction force F, self gravity G, support force F provided by the thrust sensor device 3 by vertical upward force Left side And F Right side . As can be seen from the force balance, the resultant force f=f of the supporting forces measured by the two thrust sensor devices 3 Left compression +F Right pressing +g+f, where f=f Left side +F Right side . Let F initial ＝F Left compression +F Right pressing +g, then f=f initial +f. When the test is started, the friction rod 8 and the friction elastic ring 9 do not generate relative motion, the friction force f increases along with the increase of the control signal OP, and when the thrust of the valve rod 12 is greater than the maximum static friction force f s When the valve rod 12 and the friction rod 8 start to move downwards, the friction force f reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged. When the control signal OP starts to decrease and the valve rod 12 moves upward, the direction of the friction force applied by the left clamping block 10 and the right clamping block 4 is changed to be vertical, and the resultant force f=f of the supporting forces measured by the two thrust force sensor devices 3 initial F, when the friction force f likewise reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged. The above process is repeated under the action of a periodic control signal OP.
It should be noted that in order to ensure that the force of the supporting force is always directed vertically downward, F is required to be satisfied initial >f s I.e. by varying the pretension force F on the left and right sides Left compression 、F Right pressing The conditions are met, and the pretightening forces on the left side and the right side are guaranteed to be close to each other as much as possible.
S3: after the test is finished, the OP, MV and F can be obtained by utilizing the data acquisition card 8-05 Left side And F Right side And the signals are transmitted to the upper computer 8-06. For F on upper computer 8-06 Left side And F Right side The signals are combined to obtain an F-t curve, and the F-t curve is shifted down by F initial The size becomes an f-t curve, and f is obtained by summing the absolute values of different wave peaks and wave troughs of f-t and taking an average value s By maintaining at f in the f-t curve d Summing absolute values of nearby data and taking average value to obtain f d The OP-t curve can be obtained by the controller 8-02 and the MV-t curve can be obtained by the positioner 8-01. And taking MV as an ordinate and OP as an abscissa, so as to obtain an MV-OP curve. The pneumatic control valve sticking fault condition can be analyzed according to the obtained MV-OP curve.
The above embodiment is only a preferred embodiment of the present invention, but it is not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, all the technical schemes obtained by adopting the equivalent substitution or equivalent transformation are within the protection scope of the invention.
Claims (10)
1. The device is characterized by comprising a pneumatic film actuator, a positioner (8-01), a data acquisition card (8-05), a controller (8-02), an upper computer (8-06) and a viscous fault generating device;
the viscous fault generating device comprises a left clamping block (10), a right clamping block (4) and a friction rod (8); a vertical friction rod (8) is clamped between the left clamping block (10) and the right clamping block (4), and the left clamping block (10) and the right clamping block (4) are positioned on the same horizontal plane and are axially symmetrically distributed relative to the friction rod (8); the contact part of the left clamping block (10) and the right clamping block (4) and the friction rod (8) is provided with a friction elastic ring (9), and the friction rod (8) can vertically slide relative to the friction elastic ring (9); the horizontal clamping force of the friction rod (8) can be changed between the left clamping block (10) and the right clamping block (4) through the adjusting piece, and the upper part of the friction rod (8) is fixedly connected with the lower part of the valve rod (12) of the pneumatic film actuator in a coaxial and detachable manner; the outer end parts of the left clamping block (10) and the right clamping block (4) are respectively arranged at the top parts of two supporting frames, the two outer end parts can be detachably fixed on the supporting frames through the compression cover (5) respectively, and the vertical pressure applied to the outer end parts can be adjusted through the compression cover (5); a sliding groove which is used for placing the outer end part and can provide one degree of freedom sliding for the horizontal direction of the clamping block is formed between the pressing cover (5) and the supporting frame; the two support frame tops are all fixed with thrust sensor (3) that can contact with the outer tip bottom surface that corresponds, thrust sensor (3) link to each other with the input of data acquisition card (8-05) respectively, and the output of controller (8-02) links to each other with the input of data acquisition card (8-05) and locator (8-01) respectively, and the output of locator (8-01) links to each other with the input of data acquisition card (8-05), and the output of data acquisition card (8-05) links to each other with host computer (8-06).
2. A pneumatic control valve sticking failure test apparatus according to claim 1, characterized in that the friction lever (8) is screwed with the valve stem (12).
3. A pneumatic control valve sticking failure test apparatus according to claim 1, characterized in that the left clamping block (10) and the right clamping block (4) each comprise a clamping end, a force transmission rod (1003) and an outer end; the clamping end is used for clamping the friction rod (8), and an arc-shaped groove (1002) used for placing the friction rod (8) and the friction elastic ring (9) is formed in one side, adjacent to the friction rod (8); the clamping end of the left clamping block (10) is provided with a plurality of through bolt grooves (1001) along the circumferential direction, the clamping end of the right clamping block (4) is provided with a plurality of through hole grooves along the circumferential direction, and the number and the positions of the bolt grooves (1001) and the through hole grooves are corresponding; the adjusting piece comprises a locking bolt (6) and a locking nut (7), and the locking bolt (6) can sequentially penetrate through the bolt groove (1001) and the through hole groove and is screwed and fixed through the locking nut (7).
4. A pneumatic control valve sticking failure test apparatus according to claim 3, wherein the top and bottom of the arcuate slot (1002) are provided with raised stoppers for preventing the frictional resilient ring (9) from moving up and down.
5. The pneumatic control valve adhesion fault test device according to claim 1, wherein the friction elastic ring (9) is detachably sleeved outside the friction rod (8) and is made of rubber, carbon fiber or flexible graphite.
6. The pneumatic control valve adhesion fault test device according to claim 1, wherein the supporting frame is vertically fixed on the supporting base (2), and the supporting base (2) can be fixed on the ground through a plurality of anchor bolts (1) circumferentially distributed.
7. The pneumatic control valve sticking failure test device according to claim 6, wherein the compression cover (5) is circumferentially provided with a plurality of through bolt holes, and the compression cover is fixed on the support frame by the through bolt holes of the compression bolts (11) so as to provide pretightening force for the thrust sensor device (3) and keep the stress direction of the thrust sensor device (3) vertically downward.
8. The pneumatic control valve sticking failure test device according to claim 6, wherein the pneumatic film actuator and the positioner (8-01) are both fixed on the support base (2) through a support frame.
9. A test analysis method using the pneumatic control valve adhesion failure test apparatus according to any one of claims 1 to 8, characterized by comprising the steps of:
s1: before the test starts, the pneumatic film actuator is arranged on the viscous fault generating device, so that the friction rod (8) and the valve rod (12) are ensured not to be eccentric; the horizontal clamping force of the left clamping block (10) and the right clamping block (4) on the friction rod (8) is changed through the adjusting piece, so that positive pressure is generated on the friction rod (8), and the friction force between the friction rod (8) and the friction elastic ring (9) after the test starts can be generated sufficiently so as to reflect the nonlinear characteristic of viscous faults; the pressing cover (5) is adjusted to provide pretightening force for the thrust sensor device (3), so that the stress direction of the thrust sensor device (3) is kept vertically downward; one path of signals of the two thrust sensor devices (3) is connected to an AI0 input channel of the data acquisition card (8-05), and the other path of signals of the two thrust sensor devices is connected to an AI1 input channel of the data acquisition card (8-05); one path of the output signal OP of the controller (8-02) is connected with the locator (8-01), and the other path is connected with an AI2 input channel of the data acquisition card (8-05); the valve position signal MV output by the positioner (8-01) is connected to the AI3 input channel of the data acquisition card (8-05);
s2: when the test starts, a control signal OP of a sine function is output by a controller (8-02) to enable the valve rod (12) to realize up-and-down reciprocating motion; when the control signal OP starts to increase and the valve rod (12) has a downward movement trend, the left clamping block (10) and the right clamping block (4) are subjected to vertical downward force to press the cover (5) to apply a pretightening force F to the thrust sensor device (3) Left compression And F Right pressing Friction force f, self gravity G, provided by a thrust sensor device (3) receiving a vertical upward forceSupport force F Left side And F Right side The method comprises the steps of carrying out a first treatment on the surface of the From the force balance, the resultant force F=F of the supporting forces measured by the two thrust sensor devices (3) Left compression +F Right pressing +g+f, where f=f Left side +F Right side The method comprises the steps of carrying out a first treatment on the surface of the Let F initial ＝F Left compression +F Right pressing +g, then f=f initial +f; when the test is started, the friction rod (8) and the friction elastic ring (9) do not move relatively, the friction force f is increased along with the increase of the control signal OP, and when the thrust of the valve rod (12) is greater than the maximum static friction force f s When the valve rod (12) and the friction rod (8) start to move downwards, the friction force f reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged; when the control signal OP starts to decrease and the valve rod (12) has a trend of upward movement, the directions of friction forces born by the left clamping block (10) and the right clamping block (4) are changed to be vertical upward, and the resultant force F=F of supporting forces measured by the two thrust force sensing devices (3) initial F, when the friction force f likewise reaches the maximum static friction force f s Immediately after becoming a sliding friction force f d And remain substantially unchanged; repeating the above process under the action of a periodic control signal OP;
s3: after the test is finished, the OP, MV and F can be obtained by utilizing a data acquisition card (8-05) Left side And F Right side The signal is transmitted to an upper computer (8-06); for F on the upper computer (8-06) Left side And F Right side The signals are combined to obtain an F-t curve, and the F-t curve is shifted down by F initial The size becomes an f-t curve, and f is obtained by summing the absolute values of different wave peaks and wave troughs of f-t and taking an average value s By maintaining at f in the f-t curve d Summing absolute values of nearby data and taking average value to obtain f d An OP-t curve can be obtained through the controller (8-02), and an MV-t curve can be obtained through the positioner (8-01); and taking MV as an ordinate and OP as an abscissa, so as to obtain an MV-OP curve.
10. The test analysis method according to claim 9, wherein the pre-tightening force F is changed between the left and right sides Left compression And F Right pressing F is made to initial >f s 。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310052074.9A CN116296352A (en) | 2023-02-02 | 2023-02-02 | Pneumatic regulating valve viscous fault test device and test analysis method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310052074.9A CN116296352A (en) | 2023-02-02 | 2023-02-02 | Pneumatic regulating valve viscous fault test device and test analysis method thereof |
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| CN116296352A true CN116296352A (en) | 2023-06-23 |
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| CN202310052074.9A Pending CN116296352A (en) | 2023-02-02 | 2023-02-02 | Pneumatic regulating valve viscous fault test device and test analysis method thereof |
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| Country | Link |
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| CN (1) | CN116296352A (en) |
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