A dual-valve friction force testing method

Abstract

The present invention relates to the technical field of dual-valve friction force testing, and discloses a dual-valve friction force testing method. The method includes a testing device, the testing device including a push-pull mechanism, the push-pull mechanism including a test push-pull rod, and the length direction of the test push-pull rod is the X direction. The testing method includes the following steps: placing the push-pull mechanism and the valve relative to each other along the X direction; measuring the pitch angle and yaw angle of the test push-pull rod; adjusting the pitch position and yaw position of the valve based on the pitch angle and yaw angle so that the valve stem on the valve is parallel to the test push-pull rod; translating the spatial position of the test push-pull rod so that the test push-pull rod and the valve stem are coaxial; connecting the valve stem and the test push-pull rod via a force sensor, driving the test push-pull rod to move along the X direction, and the force sensor displaying a tensile force, which is the friction force between the valve stem and the sealing packing in the valve body. The friction force test has high accuracy and a wide range of applications.

Description

Technical Field

[0001] This invention relates to the field of dual-valve friction force testing technology, and more particularly to a dual-valve friction force testing method. Background Technology

[0002] A dual-valve system is a valve structure consisting of two independent valves. A dual-valve structure generally comprises an inlet valve and an outlet valve, which move synchronously via a synchronizing device to control and regulate pipeline flow. The valve stem is a crucial component, used for transmission, connecting to the actuator or handle above and directly driving the valve core to move or rotate, thus opening and closing the valve or regulating it. During valve opening and closing, the valve stem is not only a moving and force-bearing component but also a sealing component. It is subjected to the impact and corrosion of the medium and also rubs against the packing to prevent leakage. To achieve a good valve stem seal, it is essential to select appropriate packing materials based on different operating conditions, rationally design the stuffing box depth and valve stem diameter, and adopt a suitable packing seal structure. Therefore, measuring the frictional force of the axial reciprocating linear motion between the valve stem and the valve body sealing packing is of great significance. In existing technologies, the measurement of this frictional force typically involves directly connecting the valve stem and applying force, which cannot guarantee the coaxiality of the valve stem and the drive end of the actuator during testing, affecting test accuracy.

[0003] Therefore, a dual-valve friction force testing method is urgently needed to solve the above problems. Summary of the Invention

[0004] Based on the above, the purpose of this invention is to provide a dual-valve friction force testing method with high friction force testing accuracy and wide applicability.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A dual-valve friction force testing method includes a testing device, the testing device including a push-pull force mechanism, the push-pull force mechanism including a test push-pull force rod, with the length direction of the test push-pull force rod as the X direction, the testing method including the following steps:

[0007] The push-pull mechanism and the valve are positioned opposite each other along the X direction;

[0008] Measure the pitch and yaw angles of the test push-pull rod;

[0009] Based on the pitch angle and the yaw angle, adjust the pitch and yaw positions of the valve so that the valve stem is parallel to the test push-pull rod;

[0010] The spatial position of the test push-pull rod is translated so that the test push-pull rod is coaxial with the valve stem;

[0011] The valve stem and the test push-pull rod are connected by a force sensor. The test push-pull rod is driven to move along the X direction. The force sensor displays the tension, which is the frictional force between the valve stem and the sealing packing inside the valve body.

[0012] As a preferred embodiment of a dual-valve friction force testing method, the connection between the valve stem and the test push-pull rod includes:

[0013] A valve stem sleeve is coaxially fitted onto one end of the valve stem, and a first screw protrudes from the end of the valve stem sleeve opposite to the valve stem.

[0014] A push-pull rod sleeve is coaxially connected to one end of the test push-pull rod through the force sensor. A second screw protrudes from the end of the push-pull rod sleeve away from the test push-pull rod. The threads on the second screw and the threads on the first screw have opposite directions.

[0015] The first screw and the second screw are connected by a connecting sleeve thread.

[0016] As a preferred embodiment of a dual-valve friction force testing method, measuring the pitch and yaw angles of the test push-pull rod includes:

[0017] Prepare a carrier sleeve;

[0018] An inclination sensor is mounted parallel to the axis of the carrier sleeve on the outside of the carrier sleeve;

[0019] After connecting the push-pull rod sleeve to the test push-pull rod, the carrier sleeve is coaxially fitted outside the push-pull rod sleeve, and then the tilt sensor is zeroed.

[0020] As a preferred embodiment of a dual-valve friction force testing method, the tilt sensor, after being zeroed, further includes:

[0021] Remove the carrier sleeve from the push-pull rod sleeve;

[0022] After coaxially fitting the valve stem sleeve onto the valve stem, coaxially fitting the carrier sleeve onto the outside of the valve stem sleeve, and adjusting the pitch and yaw positions of the valve, so that the tilt sensor returns to zero.

[0023] As a preferred embodiment of a dual-valve friction force testing method, the testing device further includes a fixed base, a pitch drive source, a pitch frame 52, a yaw drive source, and a yaw rotary table. The pitch drive source is mounted on the fixed base and drives the pitch frame 52, enabling the pitch frame 52 to rotate around the Y direction. The yaw rotary table is rotatably mounted on the pitch frame 52 around its axis, and the axis of the yaw rotary table is perpendicular to the Y direction. The yaw drive source drives and connects to the yaw rotary table. Before testing, the valve flange is fixed to the yaw rotary table with bolts. Adjusting the pitch and yaw positions of the valve includes:

[0024] Start the pitch drive source, so that the pitch drive source drives the pitch frame 52 to rotate around the Y direction until the pitch angle value of the tilt sensor returns to zero;

[0025] The yaw drive source is activated, causing the yaw rotary table to rotate around its axis until the yaw angle value of the tilt sensor returns to zero.

[0026] As a preferred embodiment of a dual-valve friction force testing method, the testing device further includes a locking mechanism, and after the pitch angle value of the tilt sensor is returned to zero, it also includes:

[0027] The locking element is connected to the pitch frame 52 and the fixed base, so that the pitch frame 52 and the fixed base are relatively fixed.

[0028] As a preferred embodiment of a dual-valve friction force testing method, the testing device further includes a centering mechanism, which comprises a centering sleeve and a zeroing fixture. Two dial indicators are mounted on the centering sleeve, with their measuring rods vertically aligned. The zeroing fixture comprises a coaxial first section and a second section. The first section has the same shape and dimensions as the valve stem sleeve, and the second section has the same shape and dimensions as the push-pull rod sleeve. Adjusting the spatial position of the test push-pull rod includes:

[0029] Adjust the position of the test push-pull rod in the Y and Z directions so that the spatial distance between the test push-pull rod and the valve rod is within a preset range;

[0030] The centering sleeve is placed over the zeroing fixture, and the measuring rods of the two dial indicators respectively abut against the outer periphery of the first section to zero the two dial indicators;

[0031] Remove the centering sleeve from the zeroing fixture, put one end of the centering sleeve over the valve stem sleeve, the two dial indicators display the values, and move the test push-pull rod so that the push-pull rod sleeve is put into the other end of the centering sleeve.

[0032] Adjust the position of the test push-pull rod in the Y-axis and Z-axis directions so that the values ​​of the two dial indicators are returned to zero, and the test push-pull rod and the valve rod are coaxial.

[0033] As a preferred embodiment of a dual-valve friction force testing method, the push-pull force mechanism further includes an adjustment component and an X-axis drive source. The adjustment component includes a support frame, a movable frame, a Z-axis drive source, a Y-axis movable plate, and a Y-axis drive source. The Z-axis drive source is mounted on the support frame and drives the movable frame. The Y-axis drive source is mounted on the movable frame and drives the Y-axis movable plate. The X-axis drive source is mounted on the Y-axis movable plate and drives the test push-pull force rod. Adjusting the spatial distance between the test push-pull force rod and the valve stem within a preset range includes:

[0034] The Z-axis drive source is activated, which drives the moving frame to move in the Z direction, thereby causing the X-axis drive source and the test push-pull rod to move in the Z direction.

[0035] The Y-axis drive source is activated, which drives the X-axis drive source to move in the Y direction, thereby causing the test push-pull rod to move in the Y direction.

[0036] The X-axis drive source is activated, which drives the test push-pull rod to move closer to or away from the valve stem.

[0037] As a preferred embodiment of a dual-valve friction force testing method, after adjusting the test push-pull rod to be coaxial with the valve rod, the method further includes:

[0038] Move the test push-pull rod along the X direction to disengage the push-pull rod sleeve from the centering sleeve;

[0039] Remove the centering sleeve from the valve stem sleeve.

[0040] The beneficial effects of the present invention are:

[0041] This invention provides a dual-valve friction force testing method. By adjusting the valve angle according to the pitch and yaw angles of the test push-pull rod, the valve stem is made parallel to the test push-pull rod, effectively improving the coaxiality of the subsequent test push-pull rod and valve stem connection. Furthermore, by translating the spatial position of the test push-pull rod, coaxiality between the test push-pull rod and valve stem is achieved. During this translation, the test push-pull rod and valve stem remain parallel, resulting in high coaxiality after the final connection. This means that when the test push-pull rod applies a push-pull force, the direction of the force is consistent with the axial direction of the valve stem, making the detected push-pull force results more accurate. Therefore, the measured friction force between the valve stem and the sealing packing is highly accurate, providing valuable test results for the study of valve sealing packing friction force. Moreover, because coaxiality is adjusted by modifying the spatial angle of the valve and the spatial position of the test push-pull rod, this dual-valve friction force testing method is applicable to different types of valves, thus having a wide range of applications. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0043] Figure 1 This is a flowchart of the dual-valve friction force testing method provided in the embodiments of the present invention;

[0044] Figure 2 This is a schematic diagram of the structure of the testing device provided in an embodiment of the present invention;

[0045] Figure 3 This is a side view of the testing device provided in the embodiments of the present invention. Figure 1 ;

[0046] Figure 4 This is a side view of the testing device provided in the embodiments of the present invention. Figure 2 ;

[0047] Figure 5 This is a schematic diagram of the valve fixing assembly provided in an embodiment of the present invention;

[0048] Figure 6 This is a schematic diagram of the structure of the fixing base provided in an embodiment of the present invention;

[0049] Figure 7 This is a schematic diagram of the valve stem sleeve provided in an embodiment of the present invention;

[0050] Figure 8 This is a schematic diagram of the connecting sleeve provided in an embodiment of the present invention;

[0051] Figure 9 This is a schematic diagram of the push-pull rod sleeve provided in an embodiment of the present invention;

[0052] Figure 10 This is a schematic diagram of the centering sleeve provided in an embodiment of the present invention;

[0053] Figure 11 This is a side view of the centering sleeve and dial indicator provided in an embodiment of the present invention;

[0054] Figure 12 This is a schematic diagram of the zeroing fixture provided in an embodiment of the present invention;

[0055] Figure 13 This is a schematic diagram of the structure of the carrier sleeve provided in an embodiment of the present invention;

[0056] Figure 14 This is a side view of the carrier sleeve and tilt sensor provided in an embodiment of the present invention;

[0057] Figure 15 This is a cross-sectional view of the sensor sleeve provided in an embodiment of the present invention being fitted onto the push-pull force sleeve;

[0058] Figure 16 This is a cross-sectional view of the sensor sleeve fitted onto the valve stem sleeve according to an embodiment of the present invention;

[0059] Figure 17 This is a cross-sectional view of the coaxial adjusting sleeve provided in an embodiment of the present invention being fitted onto a zeroing fixture;

[0060] Figure 18 This is a cross-sectional view of the coaxial adjusting sleeve fitted onto the valve stem sleeve and the push-pull force sleeve provided in the embodiment of the present invention.

[0061] In the picture:

[0062] 1. Push-pull force mechanism; 11. Adjustment assembly; 111. Support frame; 112. Moving frame; 113. Z-axis drive source; 114. Y-axis drive source; 115. Y-axis moving plate; 12. X-axis drive source; 13. Test push-pull force rod; 2. Force sensor; 3. Valve stem sleeve; 31. First screw; 4. Push-pull rod sleeve; 41. Second screw; 42. Positioning pin; 5. Valve fixing assembly; 51. Fixing seat; 52. Pitch frame; 53. Pitch drive. Source; 54, Locking component; 541, Locking pin; 542, Limiting head; 543, Offset fork; 55, Yaw drive source; 56, Yaw rotary table; 6, Centering mechanism; 61, Centering sleeve; 60, Positioning groove; 62, Zeroing fixture; 621, First section; 622, Second section; 623, Third section; 63, Dial indicator; 7, Connecting sleeve; 8, Carrier sleeve; 81, Tilt sensor; 100, Valve; 1001, Valve stem; 1002, Flange. Detailed Implementation

[0063] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0064] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0065] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning.

[0067] like Figures 1 to 18 As shown, this embodiment provides a dual-valve friction force testing method. This method measures the friction force between the valve stem 1001 of the valve 100 and the valve body sealing packing during axial reciprocating linear motion. A push-pull force is applied to the valve 100, and a force sensor 2 detects the magnitude of the applied force, thus measuring the friction force. Specifically, a testing device is used, including a push-pull force mechanism 1 and a test push-pull force rod 13. The length direction of the test push-pull force rod 13 is taken as the X-direction. The dual-valve friction force testing method specifically includes the following steps:

[0068] S100: The push-pull mechanism 1 and the valve 100 are placed opposite each other in the X direction; by setting the push-pull mechanism 1 and the valve 100 relative to each other, the valve stem 1001 and the test push-pull rod 13 are roughly in relative positions, which makes it easy to smoothly connect the valve stem 1001 and the test push-pull rod 13 after adjusting the angle and position of the valve stem 1001 and the test push-pull rod 13.

[0069] S200: Measure and test the pitch and yaw angles of push-pull rod 13;

[0070] Among them, the pitch angle refers to the angle of the test push-pull rod 13 relative to the horizontal plane, and the yaw angle refers to the spatial angle between the test push-pull rod 13 and the vertical plane containing the X direction.

[0071] S300: Adjust the pitch and yaw positions of valve 100 according to the pitch and yaw angles so that valve stem 1001 is parallel to test push-pull rod 13;

[0072] That is, adjust the angles of valve 100 with the Y and Z directions as the rotation axes respectively, thereby adjusting the pitch and yaw angles of valve stem 1001 until valve stem 1001 is parallel to test push-pull rod 13.

[0073] S400: Translate the spatial position of the test push-pull rod 13 so that the test push-pull rod 13 is coaxial with the valve stem 1001;

[0074] That is, the test push-pull rod 13 is translated in the Y and Z directions respectively, so that the test push-pull rod 13 and the valve rod 1001 are in a straight line, and the test push-pull rod 13 and the valve rod 1001 remain parallel during the translation process to ensure the coaxiality of subsequent docking.

[0075] S500: The valve stem 1001 and the test push-pull rod 13 are connected through the force sensor 2. The test push-pull rod 13 is driven to move along the X direction. The force sensor 2 displays the tension, which is the friction force between the valve stem 1001 and the sealing packing inside the valve body of the valve 100.

[0076] By adjusting the angle of the valve 100 according to the pitch and yaw angles of the test push-pull rod 13, the valve stem 1001 is made parallel to the test push-pull rod 13. This effectively improves the coaxiality of the subsequent test push-pull rod 13 and valve stem 1001 after connection. Furthermore, by translating the spatial position of the test push-pull rod 13 to make it coaxial with the valve stem 1001, and maintaining parallelism during the translation process, the final connected test push-pull rod 13 and valve stem 1001 have high coaxiality. That is, when the test push-pull rod 13 applies a push-pull force, the direction of the force is consistent with the axial direction of the valve stem 1001, making the detected push-pull force results more accurate. This results in higher precision of the frictional force between the valve stem 1001 and the sealing packing, providing valuable test results for the study of the frictional force of the valve 100 sealing packing. Meanwhile, since the coaxiality is adjusted by adjusting the spatial angle of the valve 100 and the spatial position of the test push-pull rod 13, instead of using a push-pull force device fixed on the table as in the prior art, this dual-valve friction force test method can be applied to different valves 100 and has a wide range of applications.

[0077] Specifically, the connection between the valve stem 1001 and the test push-pull rod 13 includes:

[0078] S501: A valve stem sleeve 3 is coaxially sleeved on one end of the valve stem 1001, and a first screw 31 protrudes from the end of the valve stem sleeve 3 away from the valve stem 1001.

[0079] For example, one end of the valve stem 1001 is provided with a first external thread, and one end of the valve stem sleeve 3 is provided with a first internal thread. The valve stem 1001 and the valve stem sleeve 3 are detachably connected through the thread engagement of the first internal thread and the first external thread. Preferably, the size of the end of the valve stem sleeve 3 connected to the valve stem 1001 is adjustable. For example, the valve stem sleeve 3 has various models, and different models of valve stem sleeve 3 have different inner diameter first internal threads to be suitable for different valves 100.

[0080] S502: A push-pull rod sleeve 4 is coaxially connected to one end of the test push-pull rod 13 via a force sensor 2. A second screw 41 is protruding from the end of the push-pull rod sleeve 4 away from the test push-pull rod 13. The threads on the second screw 41 and the threads on the first screw 31 have opposite directions of rotation.

[0081] S503: A connecting sleeve 7 is used to thread the first screw 31 and the second screw 41.

[0082] While rotating the connecting sleeve 7, the test push-pull rod 13 is moved, so that the first screw 31 is connected to the connecting sleeve 7 and the second screw 41 is screwed into the connecting sleeve 7, thus achieving a stable connection between the test push-pull rod 13 and the valve stem 1001.

[0083] Furthermore, such as Figure 1 , Figures 7 to 16 As shown, the pitch and yaw angles of the push-pull rod 13 are measured and tested, including:

[0084] S201: Prepare a carrier sleeve 8;

[0085] S202: An inclination sensor 81 is mounted parallel to the axis of the carrier sleeve 8 outside the carrier sleeve 8; wherein, the inclination sensor 81 is preferably a triaxial inclination sensor 81.

[0086] S203: After connecting the push-pull rod sleeve 4 to the test push-pull rod 13, coaxially fit the carrier sleeve 8 outside the push-pull rod sleeve 4, and then return the tilt sensor 81 to zero.

[0087] After the tilt sensor 81 is zeroed, the overall angle of the tilt sensor 81 is the same as the direction of the test push-pull rod 13.

[0088] S204: Remove body sleeve 8 from push-pull rod sleeve 4;

[0089] S205: After coaxially fitting the valve stem sleeve 3 onto the valve stem 1001, coaxially fitting the carrier sleeve 8 onto the outside of the valve stem sleeve 3, and adjusting the pitch and yaw positions of the valve 100 so that the tilt sensor 81 returns to zero.

[0090] Remove the carrier sleeve 8 and coaxially place it onto the valve stem sleeve 3. At this time, the tilt sensor 81 detects the tilt angle of the valve stem 1001. By adjusting the angle of the valve stem 1001 rotating around the Y-axis to zero, and by adjusting the angle of the valve stem 1001 rotating around the Z-axis to zero, the valve stem 1001 is made spatially parallel to the test push-pull rod 13 along its length. That is, when it is necessary to perform friction force testing on any valve 100 under test, simply place the carrier sleeve 8 successively onto the push-pull rod sleeve 4 and the valve stem sleeve 3 to accurately achieve parallel adjustment of the valve stem 1001 and the test push-pull rod 13.

[0091] In this embodiment, as Figures 2 to 6 As shown, the test device also includes a valve fixing assembly 5, which includes a fixing base 51, a pitch drive source 53, a pitch frame 52, a yaw drive source 55, and a yaw rotary table 56. The pitch drive source 53 is mounted on the fixing base 51 and drives the pitch frame 52, enabling the pitch frame 52 to rotate around the Y direction. The yaw rotary table 56 is rotatably mounted on the pitch frame 52 around its axis, and the axis of the yaw rotary table 56 is perpendicular to the Y direction. The yaw drive source 55 drives the yaw rotary table 56, enabling the yaw rotary table 56 to rotate around its axis. The valve under test 100 can be detachably mounted on the yaw rotary table 56, for example, by fixing the flange 1002 of the valve 100 to the yaw rotary table 56 with several fastening bolts. The fastening bolts are exemplarily 6 or 7, etc., depending on the actual needs. More preferably, when installing flange 1002, one or more pads can be added or removed between flange 1002 and yaw rotary table 56 to meet different installation height requirements.

[0092] For example, the pitch drive source 53 includes a stepper motor and a worm gear reducer. The fixed base 51 includes a fixed base plate and two opposing support plates vertically mounted on the fixed base plate. The pitch frame 52 is rotatably connected between the two support plates via a rotary shaft. The rotary shaft is rotatably connected to the two support plates via two rolling bearings. The pitch frame 52 and the rotary shaft are connected via splines. The drive end of the stepper motor is connected to the input end of the worm gear reducer, and the output end of the worm gear reducer is connected to the rotary shaft. The drive motor drives the rotary shaft to rotate via a reverse-locking worm gear reducer, thereby adjusting the pitch angle of the pitch frame 52 by ±3°. The reverse-locking worm gear reducer can achieve reverse self-locking at any position.

[0093] For example, a yaw rotary table 56 is rotatably mounted on the pitch frame 52 via a rotary shaft. The rotary shaft is connected to the pitch frame 52 via a rotating rolling bearing, and the valve under test 100 can be fixed on the yaw rotary table 56. The yaw drive source 55 includes a stepper motor and a right-angle planetary reducer. The stepper motor drives the right-angle planetary reducer, and the rotary shaft is connected to the right-angle planetary reducer via a coupling. During the movement, the stepper motor provides power to drive the right-angle planetary reducer, which in turn drives the yaw rotary table 56 to move back and forth. The speed of the yaw rotary table 56 moving back and forth during operation is controlled by the stepper motor. Preferably, the right-angle planetary reducer is also connected to an electromagnetic power-off brake, which ensures timely braking in the event of an accidental power failure, thereby ensuring the safety of the dual-valve friction force testing device.

[0094] Adjusting the pitch and yaw positions of valve 100 specifically includes the following steps:

[0095] S301: Start the pitch drive source 53, so that the pitch drive source 53 drives the pitch frame 52 to rotate around the Y direction until the pitch angle value of the tilt sensor 81 returns to zero.

[0096] S302: Start the yaw drive source 55, so that the yaw rotary table 56 rotates around its axis until the yaw angle value of the tilt sensor 81 returns to zero.

[0097] The pitch drive source 53 drives the pitch frame 52 to rotate, causing the valve 100 to rotate around the Y direction, thus making the valve stem 1001 pitch relative to the horizontal plane. Then, the yaw rotary table 56 rotates around its axis to make the line of the valve stem 1001 parallel to the line of the push-pull rod sleeve 4, thereby improving the coaxiality of the subsequent connection between the valve stem 1001 and the test push-pull rod 13, and thus improving the accuracy of the friction force test. The yaw drive source 55 drives the yaw rotary table 56 to rotate, thereby driving the valve under test 100 to rotate, realizing the oscillation of the valve stem 1001 relative to the X direction, that is, driving the valve stem 1001 to adjust to be parallel to the line of the test push-pull rod 13. Since the valve stem 1001 has pitch and yaw angle deviations relative to the valve 100 (for example, deviations within ±3°), the pitch and yaw angle adjustment mechanism can adapt to the pitch and yaw angle deviations of the valve stem 1001 relative to the valve 100, improving the measurement accuracy.

[0098] Preferably, after the pitch angle value of the tilt sensor 81 is returned to zero, the following steps are also included:

[0099] S303: A locking element 54 is used to limit the connection between the pitch frame 52 and the fixed base 51, so that the pitch frame 52 and the fixed base 51 are relatively fixed.

[0100] The testing device includes a locking element 54, which is mounted on a fixed base 51 and can be connected to or released from a pitch frame 52 to limit its rotation relative to the fixed base 51, or to allow it to rotate relative to the fixed base 51. Once the pitch frame 52 is in position, the locking element 54 further secures the pitch frame 52 and the fixed base 51, increasing the rigidity of the pitch frame 52 during testing. More preferably, multiple locking elements 54 are provided, and these multiple locking elements 54 can be connected to one or two support plates at intervals.

[0101] For example, the lock 54 includes a locking pin 541 and an offset fork 543. The offset fork 543 is rotatably connected to one end of the locking pin 541, and the other end of the locking pin 541 is provided with a limiting head 542. A first limiting hole is provided on the support plate, and a second limiting hole is provided on the pitch frame 52. The locking pin 541 is movably inserted through the first limiting hole and the second limiting hole. By rotating the offset fork 543, the locking pin 541 can be moved to a position where the lock head abuts against or moves away from the side of the pitch frame 52 away from the support plate. Preferably, the second limiting hole is a stepped hole, with the smaller section of the stepped hole facing the first limiting hole and the larger section facing away from the first limiting hole.

[0102] Specifically, the offset fork 543 includes a U-shaped plate and a locking handle. One end of the locking pin 541 is rotatably connected between the U-shaped plates via a rotating pin. When the locking handle is subjected to force, it causes the U-shaped plate to rotate around the rotating pin. The end of the U-shaped plate can rotate to abut against the side of the support plate away from the pitch frame 52. At this time, the locking pin 541 moves away from the pitch frame 52 until the limiting head 542 abuts against the step surface in the step hole, thereby achieving relative fixation of the pitch frame 52 and the fixed seat 51. When the locking handle is subjected to force, it causes the U-shaped plate to continue rotating around the rotating pin or rotate in the opposite direction. The end of the U-shaped plate moves away from the support plate away from the pitch frame 52. At this time, the locking pin 541 moves away from the support plate until the limiting head 542 moves away from the pitch frame 52 away from the support plate, thereby releasing the pitch frame 52 and the fixed seat 51. Of course, in other embodiments, the locking member 54 can also be other structures. For example, the locking member 54 is a set screw threaded to the support plate. By rotating the set screw, the set screw moves along the Y direction, thereby causing the set screw to abut against or move away from the pitch frame 52, thus fixing or releasing the pitch frame 52 and the fixed seat 51.

[0103] Furthermore, the push-pull mechanism also includes an adjustment component 11 and an X-axis drive source 12. The adjustment component 11 includes a support frame 111, a movable frame 112, a Z-axis drive source 113, a Y-axis movable plate 115, and a Y-axis drive source 114. The Z-axis drive source 113 is mounted on the support frame 111 and drives the movable frame 112. The Y-axis drive source 114 is mounted on the movable frame 112 and drives the Y-axis movable plate 115. The X-axis drive source 12 is mounted on the Y-axis movable plate 115 and drives the test push-pull rod 13.

[0104] In step S400, the spatial position of the test push-pull rod 13 is adjusted through the following steps:

[0105] S401: Start the Z-axis drive source 113. The Z-axis drive source 113 drives the moving frame 112 to move in the Z direction, which in turn drives the X-axis drive source 12 and the test push-pull rod 13 to move in the Z-axis direction; that is, the test push-pull rod 13 moves in the Z direction closer to the valve stem 1001.

[0106] S402: Start the Y-direction drive source 114, which drives the X-direction drive source 12 to move in the Y direction, thereby causing the test push-pull rod 13 to move in the Y direction; that is, the test push-pull rod 13 moves closer to the valve stem 1001 in the Y direction.

[0107] S403: Start the X-direction drive source 12. The X-direction drive source 12 drives the test push-pull rod 13 to move closer to or away from the valve stem 1001. That is, the test push-pull rod 13 is moved closer to the valve stem 1001 in the X direction.

[0108] Preferably, the support frame 111 adopts a symmetrical structure, including two opposing side webs, with the Z-axis drive source 113 located between the two side webs, resulting in better structural compactness and higher structural strength. More preferably, the support frame 111 is provided with weight-reduction holes, which reduces its weight without affecting structural strength, thus saving costs and facilitating transportation.

[0109] For example, the Z-axis drive source 113 includes a drive motor and a worm gear jack. The drive motor drives the worm gear jack, which in turn drives the movable frame 112. The drive motor drives the worm gear jack to move, thereby causing the movable frame 112 to move along the Z-direction. Of course, in other embodiments, the Z-axis drive source 113 can be other types, such as a drive cylinder.

[0110] For example, the Y-axis drive source 114 includes a drive motor and a lead screw. The drive motor drives one end of the lead screw, enabling the lead screw to rotate. A lead screw nut is provided on the Y-axis moving plate 115, and the lead screw is threadedly connected to the lead screw nut. By driving the lead screw to rotate through the drive motor, the Y-axis moving plate 115 slides along the Y direction on the moving frame 112, thereby realizing the position adjustment of the X-axis drive source 12 in the Y direction. Of course, in other embodiments, the Y-axis drive source 114 can also be other types, such as a drive cylinder.

[0111] Furthermore, the testing device also includes a centering mechanism 6, which includes a centering sleeve 61 and a zeroing fixture 62. Two dial indicators 63 are provided on the centering sleeve 61, and the measuring rods of the two dial indicators 63 are vertically arranged. The zeroing fixture 62 includes a coaxial first section 621 and a second section 622. The first section 621 has the same shape and size as the valve stem sleeve 3, and the second section 622 has the same shape and size as the push-pull rod sleeve 4.

[0112] like Figure 1 , Figures 10 to 18 As shown, in step S400, after adjusting the position of the test push-pull rod 13 in the Y and Z directions so that the spatial distance between the test push-pull rod 13 and the valve rod 1001 is within a preset range, the following steps are also included:

[0113] S404: Place the centering sleeve 61 over the zeroing fixture 62, and have the measuring rods of the two dial indicators 63 contact the outer periphery of the first section 621 respectively, and zero the two dial indicators 63.

[0114] S405: Remove the centering sleeve 61 from the zeroing fixture 62, put one end of the centering sleeve 61 over the valve stem sleeve 3, and the two dial indicators 63 display the values. Move the test push-pull rod 13 so that the push-pull rod sleeve 4 is put into the other end of the centering sleeve 61.

[0115] S406: Adjust the position of the push-pull rod 13 in the Y and Z directions to make the values ​​of the two dial gauges 63 return to zero, and test the push-pull rod 13 and valve stem 1001 to achieve coaxiality.

[0116] Preferably, the zeroing fixture 62 further includes a third section 623 coaxially arranged with the first section 621 and the second section 622. When the dial indicators 63 are in normal operation (without measuring an object), their measuring rods extend directly to their maximum range. After the centering sleeve 61 is placed on the zeroing fixture 62, the third section 623 abuts against one end of the centering sleeve 61, zeroing the two dial indicators 63. After removing the centering sleeve 61, the measuring rods of the two dial indicators 63 automatically reset, and the data displayed on the two dial indicators 63 are negative. Then, the centering sleeve 61 is fitted onto the valve stem sleeve 3. At this time, the measuring rods of the two dial indicators 63 abut against the outer peripheral wall of the valve stem sleeve 3, and the measuring rods of the two dial indicators 63 contract under force. The data displayed on the two dial indicators 63 is the deviation value between the first segment 621 and the valve stem sleeve 3. Then, the X-direction drive source 12 is driven to make the push-pull rod sleeve 4 fit into the center sleeve. The Y-direction drive source and the Z-direction drive source 113 are adjusted until the data displayed on the two dial indicators 63 are both zero, which means that the valve stem sleeve 3 and the push-pull rod sleeve 4 are coaxial. The graduation value of the two dial indicators 63 is 0.01mm. When the two dial indicators 63 are zero, it can be determined that the coaxiality between the valve stem 1001 and the test push-pull rod 13 is less than 0.1mm.

[0117] Preferably, the push-pull rod sleeve 4 is provided with two 90-degree graduated positioning posts 42 at a distance from each other, and the centering sleeve 61 has two positioning grooves 60 at one end, which can respectively engage with the two positioning posts 42. When the centering sleeve 61 is fitted onto the push-pull rod sleeve 4, the two positioning grooves 60 cooperate with the two positioning posts 42 to position the centering sleeve 61. At this time, the extension lines of the measuring rods of the two dial indicators 63 both pass through the center of the radial plane of the valve stem 1001 and are perpendicular to each other.

[0118] After alignment, the push-pull rod sleeve 4 and valve stem sleeve 3 are connected by the connecting sleeve 7. The test push-pull rod 13 is moved by the X-axis moving source to apply a pulling or pushing force to the valve stem 1001. At this time, the force detected by the force sensor 2 is the frictional force between the valve stem 1001 and the sealing packing.

[0119] In this embodiment, automated and precise adjustment is achieved through a control module. Specifically, the Z-axis drive source 113, Y-axis drive source 114, X-axis drive source 12, pitch drive source 53, and yaw drive source 55 are all connected to the control module. The control module controls the start, stop, and speed of these drive sources, achieving precise automatic control. The control module includes a controller, which can be centralized or distributed. For example, the controller can be a single microcontroller or composed of multiple distributed microcontrollers, and the microcontroller can run a control program.

[0120] Preferably, the testing device also includes an operation panel and a display screen, both connected to the control module, during testing:

[0121] After placing the carrier sleeve 8 onto the push-pull rod sleeve 4, adjust the tilt sensor 81 to zero.

[0122] Then, after the carrier sleeve 8 is removed and fitted onto the valve stem sleeve 3, the tilt sensor 81 displays the tilt data. The control module receives the tilt data and controls the pitch drive source 53 and yaw drive source 55 to start according to the tilt data. It also controls the drive speed and drive angle of the pitch drive source 53 and yaw drive source 55 so that the tilt sensor 81 displays a value of zero, indicating that the valve stem 1001 is adjusted to be parallel to the test push-pull rod 13.

[0123] Based on visual inspection, the operation panel is used to control the start of the Z-axis drive source 113 and the Y-axis drive source 114, so that the spatial distance between the test push-pull rod 13 and the valve rod 1001 is within a preset range, such as within 7mm, 8mm or 9mm.

[0124] The two dial indicators 63 are zeroed using the zeroing fixture 62;

[0125] The centering sleeve 61 is placed on the valve stem sleeve 3, the dial indicator 63 displays the data, and the control module controls the X-direction drive source 113 to drive the test push-pull rod 13 to move toward the valve stem 1001 through the operation panel until the push-pull rod sleeve 4 is put into the centering sleeve 61.

[0126] Continue to operate through the operation panel to enable the control module to start the Z-axis drive source 113 and the Y-axis drive source 114. The start of the Z-axis drive source 113 and the Y-axis drive source 114 respectively drive the X-axis drive source 12 to translate in the Z and Y directions until the data displayed by the two dial gauges 63 returns to zero.

[0127] Control the X-direction drive source 12 to drive the push-pull rod sleeve 4 to disengage from the centering sleeve 61 and remove the centering sleeve 61 from the valve stem sleeve 3;

[0128] The control module controls the X-axis drive source 12 to start by operating the control panel. The X-axis drive source 12 drives the test push-pull rod 13 to approach the valve stem sleeve 3. At the same time, the connecting sleeve 7 is used to connect the valve stem sleeve 3 and the push-pull sleeve 4.

[0129] The control module starts the X-axis drive source 12 via the operation panel and inputs the moving speed and stroke of the test push-pull rod 13. The X-axis drive source 12 drives the test push-pull rod 13 to move along the valve stem 1001 and the axis of the test push-pull rod 13. For example, the test stroke is 0mm to 200mm; the constant speed adjustment range is 0mm / s to 6mm / s, with each 1mm / s increment being a step, the deviation not exceeding 0.2mm / s, and the time to reach the constant speed is within 0.05s.

[0130] Force sensor 2 detects the thrust or tension value, and the display shows the measured thrust or tension value, which is the friction force between valve stem 1001 and the sealing packing inside the valve body.

[0131] The dual-valve friction force testing method provided in this embodiment is simple to operate and applicable to different valves 100. It can simultaneously adjust the installation height, pitch angle, and yaw angle of the valve 100 to meet the adaptive deviation of the valve 100 installation surface relative to the horizontal plane by 3°. Furthermore, the coaxiality of the valve stem 1001 and the test push-pull rod 13 is high after adjustment, resulting in high accuracy of the test results. This method can provide meaningful test results for the study of the friction force of the valve 100 sealing packing.

[0132] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A dual-valve friction force testing method, characterized in that, The test device includes a push-pull force mechanism, which includes a test push-pull force rod. The length direction of the test push-pull force rod is taken as the X direction. The test method includes the following steps: The push-pull mechanism and the valve are positioned opposite each other along the X direction; Measure the pitch and yaw angles of the test push-pull rod; Based on the pitch angle and the yaw angle, adjust the pitch and yaw positions of the valve so that the valve stem is parallel to the test push-pull rod; The spatial position of the test push-pull rod is translated so that the test push-pull rod is coaxial with the valve stem; The valve stem and the test push-pull rod are connected by a force sensor. The test push-pull rod is driven to move along the X direction. The force sensor displays the tension, which is the frictional force between the valve stem and the sealing packing inside the valve body.

2. The dual-valve friction force testing method according to claim 1, characterized in that, The connection between the valve stem and the test push-pull rod includes: A valve stem sleeve is coaxially fitted onto one end of the valve stem, and a first screw protrudes from the end of the valve stem sleeve opposite to the valve stem. A push-pull rod sleeve is coaxially connected to one end of the test push-pull rod through the force sensor. A second screw protrudes from the end of the push-pull rod sleeve away from the test push-pull rod. The threads on the second screw and the threads on the first screw have opposite directions. The first screw and the second screw are connected by a connecting sleeve thread.

3. The dual-valve friction force testing method according to claim 2, characterized in that, Measuring the pitch and yaw angles of the test push-pull rod includes: Prepare a carrier sleeve; An inclination sensor is mounted parallel to the axis of the carrier sleeve on the outside of the carrier sleeve; After connecting the push-pull rod sleeve to the test push-pull rod, the carrier sleeve is coaxially fitted outside the push-pull rod sleeve, and then the tilt sensor is zeroed.

4. The dual-valve friction force testing method according to claim 3, characterized in that, After the tilt sensor is zeroed, it also includes: Remove the carrier sleeve from the push-pull rod sleeve; After coaxially fitting the valve stem sleeve onto the valve stem, coaxially fitting the carrier sleeve onto the outside of the valve stem sleeve, and adjusting the pitch and yaw positions of the valve, so that the tilt sensor returns to zero.

5. The dual-valve friction force testing method according to claim 4, characterized in that, The testing device further includes a fixed base, a pitch drive source, a pitch frame, a yaw drive source, and a yaw rotary table. The pitch drive source is mounted on the fixed base and drives the pitch frame to rotate around the Y direction. The yaw rotary table is rotatably mounted on the pitch frame around its axis, which is perpendicular to the Y direction. The yaw drive source drives and connects to the yaw rotary table. Before testing, the valve flange is fixed to the yaw rotary table with bolts. Adjusting the pitch and yaw positions of the valve includes: Start the pitch drive source, causing the pitch drive source to rotate the pitch frame around the Y direction until the pitch angle value of the tilt sensor returns to zero; The yaw drive source is activated, causing the yaw rotary table to rotate around its axis until the yaw angle value of the tilt sensor returns to zero.

6. The dual-valve friction force testing method according to claim 5, characterized in that, The testing device also includes a locking mechanism, and after the pitch angle value of the tilt sensor is returned to zero, it also includes: The locking element is connected to the pitch frame and the fixed base to limit their relative fixation.

7. The dual-valve friction force testing method according to claim 2, characterized in that, The testing device further includes a centering mechanism, which comprises a centering sleeve and a zeroing fixture. Two dial indicators are mounted on the centering sleeve, with their measuring rods vertically aligned. The zeroing fixture comprises a coaxial first section and a second section. The first section has the same shape and dimensions as the valve stem sleeve, and the second section has the same shape and dimensions as the push-pull rod sleeve. Adjusting the spatial position of the test push-pull rod includes: Adjust the position of the test push-pull rod in the Y and Z directions so that the spatial distance between the test push-pull rod and the valve rod is within a preset range; The centering sleeve is placed over the zeroing fixture, and the measuring rods of the two dial indicators respectively abut against the outer periphery of the first section to zero the two dial indicators; Remove the centering sleeve from the zeroing fixture, put one end of the centering sleeve over the valve stem sleeve, the two dial indicators display the values, and move the test push-pull rod so that the push-pull rod sleeve is put into the other end of the centering sleeve. Adjust the position of the test push-pull rod in the Y-axis and Z-axis directions so that the values ​​of the two dial indicators are returned to zero, and the test push-pull rod and the valve rod are coaxial.

8. The dual-valve friction force testing method according to claim 7, characterized in that, The push-pull force mechanism further includes an adjustment component and an X-axis drive source. The adjustment component includes a support frame, a movable frame, a Z-axis drive source, a Y-axis movable plate, and a Y-axis drive source. The Z-axis drive source is mounted on the support frame and drives the movable frame. The Y-axis drive source is mounted on the movable frame and drives the Y-axis movable plate. The X-axis drive source is mounted on the Y-axis movable plate and drives the test push-pull force rod. Adjusting the spatial distance between the test push-pull force rod and the valve stem within a preset range includes: The Z-axis drive source is activated, which drives the moving frame to move in the Z direction, thereby causing the X-axis drive source and the test push-pull rod to move in the Z direction. The Y-axis drive source is activated, which drives the X-axis drive source to move in the Y direction, thereby causing the test push-pull rod to move in the Y direction. The X-axis drive source is activated, which drives the test push-pull rod to move closer to or away from the valve stem.

9. The dual-valve friction force testing method according to claim 7, characterized in that, After adjusting the test push-pull rod to be coaxial with the valve rod, the following is also included: Move the test push-pull rod along the X direction to disengage the push-pull rod sleeve from the centering sleeve; Remove the centering sleeve from the valve stem sleeve.

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