Double-valve friction force testing method

Abstract

The invention relates to the technical field of double-valve friction force testing, and discloses a double-valve friction force testing method, which comprises a testing device, the testing device comprises a push-pull force mechanism, the push-pull force mechanism comprises a testing push-pull force rod, and the length direction of the testing push-pull force rod is used as the X direction; the test method comprises the following steps: oppositely placing the push-pull force mechanism and the valve along the X direction; the pitch angle and the yaw angle of the push-pull force rod are measured and tested; according to the pitch angle and the yaw angle, the pitch position and the yaw position of the valve are adjusted, so that a valve rod on the valve is parallel to the test push-pull force rod; translating the space position of the test push-pull force rod to enable the test push-pull force rod to be coaxial with the valve rod; the valve rod and the test push-pull force rod are connected through the force sensor, the test push-pull force rod is driven to move in the X direction, the force sensor displays the pull force, and the pull force is the friction force between the valve rod and the sealing filler in the valve body. The friction force testing precision is high, and the application range is wide.

Description

Technical Field

[0001] The present invention relates to the technical field of double-valve friction force testing, and in particular to a double-valve friction force testing method. Background Art

[0002] A double valve is a valve structure that consists of two independent valves. The double valve structure is generally composed of an inlet valve and an outlet valve, which are synchronized by a synchronization device to achieve the control and regulation of pipeline flow. Among them, the valve stem is an important part of the valve, which is used for transmission. It is connected to the actuator or handle on the upper side and directly drives the valve core to move or rotate on the lower side to achieve the valve switch or regulation. The valve stem is not only a moving part and a force-bearing part in the process of opening and closing the valve, but also a sealing part. At the same time, it is impacted and corroded by the medium, and it also produces friction with the packing to prevent the leakage of the medium. To achieve a good valve stem sealing effect, it is necessary to select appropriate packing materials according to different working conditions, reasonably design the stuffing box depth and valve stem diameter, and adopt a reasonable packing sealing structure. Therefore, it is of great significance to measure the friction force of the axial reciprocating linear motion of the valve stem and the valve body sealing packing of the valve. In the prior art, the measurement of the friction force of the axial reciprocating linear motion of the valve stem and the valve body sealing packing is usually directly connected to the valve stem and then applied. The coaxiality of the valve stem and the driving end of the driving source cannot be guaranteed during the test, which affects the 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 the present invention is to provide a dual-valve friction force testing method, which has high friction force testing accuracy and a wide range of applications.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A double valve friction test method includes a test device, the test device includes a push-pull mechanism, the push-pull mechanism includes a test push-pull rod, and the length direction of the test push-pull rod is X direction. The test method includes the following steps:

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

[0008] Measuring the pitch angle and yaw angle of the test push-pull rod;

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

[0010] Translating the spatial position of the test push-pull rod 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, and the test push-pull rod is driven to move along the X direction. The force sensor displays the pulling force, which is the friction force between the valve stem and the sealing packing in the valve body.

[0012] As a preferred solution of a dual-valve friction force testing method, connecting the valve stem and the testing push-pull force rod comprises:

[0013] A valve stem sleeve is coaxially sleeved on one end of the valve stem, and a first screw is protruding from the end of the valve stem sleeve away from 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, and a second screw is protruded from the end of the push-pull rod sleeve away from the test push-pull rod, and the thread on the second screw is opposite to the thread on the first screw;

[0015] A connecting sleeve is used to threadably connect the first screw rod and the second screw rod.

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

[0017] Prepare a carrier sleeve;

[0018] Installing a tilt sensor outside the carrier sleeve parallel to the axis of the carrier sleeve;

[0019] After the push-pull rod sleeve is connected to the test push-pull rod, the carrier sleeve is coaxially sleeved outside the push-pull rod sleeve, and then the inclination sensor is reset to zero.

[0020] As a preferred solution of a dual-valve friction force testing method, after the tilt sensor is reset to zero, the method further includes:

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

[0022] After the valve stem sleeve is coaxially sleeved on the valve stem, the carrier sleeve is coaxially sleeved outside the valve stem sleeve, and the pitch position and yaw position of the valve are adjusted so that the inclination sensor returns to zero again.

[0023] As a preferred solution of a dual-valve friction test method, the test device mechanism further includes a fixed seat, a pitch drive source, a pitch frame 52, a yaw drive source and a yaw rotating table. The pitch drive source is arranged on the fixed seat and is driven to be connected to the pitch frame 52, and can drive the pitch frame 52 to rotate around the Y direction. The yaw rotating table is rotated around its axis and is arranged on the pitch frame 52. The axis of the yaw rotating table is perpendicular to the Y direction. The yaw drive source is driven to be connected to the yaw rotating table. Before the test, the flange of the valve is fixed to the yaw rotating table by bolts. Adjusting the pitch position and yaw position of the valve includes:

[0024] Starting the pitch driving source so that the pitch driving source drives the pitch frame 52 to rotate around the Y direction until the pitch angle value of the inclination sensor returns to zero;

[0025] The yaw driving source is started to make the yaw rotating platform rotate around its axis until the yaw angle value of the inclination sensor returns to zero.

[0026] As a preferred solution of the dual-valve friction force test method, the test device further includes a lock, and after the pitch angle value of the inclination sensor is reset to zero, the test device further includes:

[0027] The locking member is connected to the pitch frame 52 and the fixing seat in a limiting manner, so that the pitch frame 52 and the fixing seat are relatively fixed.

[0028] As a preferred solution of a dual-valve friction test method, the test device further includes a centering mechanism, the centering mechanism includes a centering sleeve and a zeroing fixture, the centering sleeve is provided with two dial indicators, the measuring rods of the two dial indicators are vertically arranged, the zeroing fixture includes a coaxial first section and a second section, the first section has the same shape and size as the valve stem sleeve, the second section has the same shape and size as the push-pull rod sleeve, and adjusting the spatial position of the test push-pull rod includes:

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

[0030] The centering sleeve is sleeved outside the zeroing jig, and the measuring rods of the two dial indicators are respectively in contact with the outer periphery of the first section, and the two dial indicators are zeroed;

[0031] Remove the centering sleeve from the zeroing jig, sleeve one end of the centering sleeve outside the valve stem sleeve, the two dial indicators display values, move the test push-pull rod so that the push-pull rod sleeve is sleeved into the other end of the centering sleeve;

[0032] The positions of the test push-pull rod in the Y-axis direction and the Z-axis direction are adjusted so that the values ​​of the two dial indicators are reset to zero and the test push-pull rod and the valve stem are coaxial.

[0033] As a preferred solution of a dual-valve friction force testing method, the push-pull force mechanism further includes a positioning component and an X-axis driving source, the positioning component includes a support frame, a mobile frame, a Z-axis driving source, a Y-axis moving plate and a Y-axis driving source, the Z-axis driving source is arranged on the support frame and is driven to connect to the mobile frame, the Y-axis driving source is arranged on the mobile frame and is driven to connect to the Y-axis moving plate, the X-axis driving source is arranged on the Y-axis moving plate and is driven to connect to the test push-pull force rod, and adjusting the spatial spacing between the test push-pull force rod and the valve stem within a preset range includes:

[0034] Starting the Z-direction driving source, the Z-direction driving source drives the moving frame to move in the Z direction, and drives the X-direction driving source and the test push-pull rod to move in the Z direction;

[0035] The Y-direction driving source is started, and the Y-direction driving source drives the X-direction driving source to move in the Y direction, thereby driving the test push-pull rod to move in the Y direction;

[0036] The X-direction driving source is started, and the X-direction driving source drives the test push-pull rod to move closer to or away from the valve stem.

[0037] As a preferred solution of a dual valve friction test method, after adjusting the test push-pull rod and the valve stem to be coaxial, the method further includes:

[0038] Moving the test push-pull rod along the X direction so that the push-pull rod sleeve is separated from the centering sleeve;

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

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

[0041] The present invention provides a double valve friction test method, by adjusting the angle of the valve according to the pitch angle and yaw angle of the test push-pull rod, so that the valve stem is parallel to the test push-pull rod, the coaxiality of the subsequent test push-pull rod and the valve stem after connection can be effectively improved, and then the test push-pull rod and the valve stem are coaxial by translating the spatial position of the test push-pull rod, and the test push-pull rod and the valve stem remain parallel during the translation process, so that the test push-pull rod and the valve stem after the final docking have a high coaxiality, that is, 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, so that the detected push-pull force result is more accurate, so that the friction between the valve stem and the sealing packing obtained by the test has a high accuracy, and can provide a test result with reference significance for the study of the friction of the valve sealing packing. At the same time, since the coaxiality adjustment is achieved by adjusting the spatial angle of the valve and the spatial position of the test push-pull rod, the double valve friction test method can be applied to different valves and has a wide range of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0043] Figure 1 is a flow chart of a dual-valve friction force testing method provided by an embodiment of the present invention;

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

[0045] Figure 3 is a side view of the test device provided by the embodiment of the present invention Figure 1 ;

[0046] Figure 4 is a side view of the test device provided by the embodiment of the present invention Figure 2 ;

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

[0048] Figure 6 is a schematic structural diagram of a fixing base provided by an embodiment of the present invention;

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

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

[0051] Fig. 9 is a schematic structural diagram of a push-pull rod sleeve provided by an embodiment of the present invention;

[0052] Fig.10 is a schematic structural diagram of a centering sleeve provided in an embodiment of the present invention;

[0053] Fig.11 is a side view of a centering sleeve and a dial indicator provided by an embodiment of the present invention;

[0054] Fig.12 is a schematic structural diagram of a zeroing fixture provided by an embodiment of the present invention;

[0055] Fig.13 is a schematic structural diagram of a carrier sleeve provided by an embodiment of the present invention;

[0056] Fig.14 is a side view of a carrier sleeve and an inclination sensor provided by an embodiment of the present invention;

[0057] Fig.15 is a cross-sectional view of a sensor sleeve provided by an embodiment of the present invention being sleeved on a push-pull sleeve;

[0058] Fig.16 is a cross-sectional view of a sensor sleeve provided by an embodiment of the present invention being sleeved on a valve stem sleeve;

[0059] Fig.17 is a cross-sectional view of a coaxial adjustment sleeve provided by an embodiment of the present invention being sleeved on a zeroing jig;

[0060] Fig.18 It is a cross-sectional view of a coaxial adjustment sleeve provided by an embodiment of the present invention being sleeved on a valve stem sleeve and a push-pull sleeve.

[0061] In the figure:

[0062] 1. Push-pull mechanism; 11. Positioning assembly; 111. Support frame; 112. Moving frame; 113. Z-axis driving source; 114. Y-axis driving source; 115. Y-axis moving plate; 12. X-axis driving source; 13. Test push-pull rod; 2. Force sensor; 3. Valve stem sleeve; 31. First screw; 4. Push-pull rod sleeve; 41. Second screw; 42. Positioning column; 5. Valve fixing assembly; 51. Fixing seat; 52. Pitch frame; 53. Pitch drive Source; 54, locking piece; 541, locking pin; 542, limit 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, inclination sensor; 100, valve; 1001, valve stem; 1002, flange. DETAILED DESCRIPTION

[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0064] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0065] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0066] In the description of the present embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0067] like Figures 1 to 18 As shown, this embodiment provides a double valve friction test method, which is used to measure the friction of the axial reciprocating linear motion between the valve stem 1001 of the valve 100 and the valve body sealing packing, by applying a push-pull force to the valve 100, and using a force sensor 2 to detect the magnitude of the applied push-pull force, that is, to achieve the measurement of the friction. Specifically, a test device is used for testing, and the test device includes a push-pull force mechanism 1, and the push-pull force mechanism 1 includes a test push-pull force rod 13, with the length direction of the test push-pull force rod 13 as the X direction. The double valve friction test method specifically includes the following steps:

[0068] S100: Place the push-pull mechanism 1 and the valve 100 relatively to each other along the X direction; by relatively arranging the push-pull mechanism 1 and the valve 100, the valve stem 1001 and the test push-pull rod 13 are roughly in relative positions, so that the valve stem 1001 and the test push-pull rod 13 can be smoothly connected after adjusting the angle and position of the valve stem 1001 and the test push-pull rod 13.

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

[0070] 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 of the test push-pull rod 13 relative to the vertical plane where the X direction is located.

[0071] S300: adjusting the pitch position and yaw position of the valve 100 according to the pitch angle and the yaw angle, so that the valve stem 1001 is parallel to the test push-pull rod 13;

[0072] That is, the angles of the valve 100 with the Y direction and the Z direction as the rotation axis are adjusted, thereby adjusting the pitch angle and the yaw angle of the valve stem 1001 until the valve stem 1001 is parallel to the test push-pull rod 13 .

[0073] S400: translating 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 direction and the Z direction respectively, so that the test push-pull rod 13 and the valve stem 1001 are located in a straight line, and the test push-pull rod 13 and the valve stem 1001 remain parallel during the translation process to ensure the coaxiality of subsequent docking.

[0075] S500: Connect the valve stem 1001 and the test push-pull rod 13 through the force sensor 2, drive the test push-pull rod 13 to move along the X direction, and the force sensor 2 displays the pulling force, which is the friction force between the valve stem 1001 and the sealing packing in the valve body of the valve 100.

[0076] By adjusting the angle of the valve 100 according to the pitch angle and yaw angle of the test push-pull rod 13, the valve stem 1001 is made parallel to the test push-pull rod 13, which can effectively improve the coaxiality of the subsequent test push-pull rod 13 and the valve stem 1001 after connection, and then the test push-pull rod 13 is translated into a spatial position so that the test push-pull rod 13 and the valve stem 1001 are coaxial. During the translation process, the test push-pull rod 13 and the valve stem 1001 remain parallel, so that the test push-pull rod 13 and the valve stem 1001 after final docking have a 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, so that the detected push-pull force result is more accurate, so that the friction force between the valve stem 1001 and the sealing packing obtained by the test is more accurate, which can provide a reference test result for the study of the friction force of the sealing packing of the valve 100. At the same time, since the coaxiality adjustment is achieved 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 device fixed on a table for testing as in the prior art, the dual-valve friction force testing method can be applied to different valves 100 and has a wider range of applications.

[0077] Specifically, connecting 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 is protruded from the end of the valve stem sleeve 3 away from the valve stem 1001;

[0079] Exemplarily, 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, and the valve stem 1001 is detachably connected to the valve stem sleeve 3 through 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 multiple models, and different models of valve stem sleeves 3 have first internal threads with different inner diameters, so as 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 through the force sensor 2, and a second screw 41 is protruded from the end of the push-pull rod sleeve 4 away from the test push-pull rod 13, and the thread on the second screw 41 is opposite to the thread on the first screw 31;

[0081] S503: Use a connecting sleeve 7 to threadably connect the first screw rod 31 and the second screw rod 41 .

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

[0083] Furthermore, if Figure 1 , Figures 7 to 16 As shown, measuring the pitch angle and yaw angle of the push-pull rod 13 includes:

[0084] S201: Prepare a carrier sleeve 8;

[0085] S202 : Install an inclination sensor 81 outside the carrier sleeve 8 parallel to the axis of the carrier sleeve 8 ; wherein the inclination sensor 81 is preferably a three-axis inclination sensor 81 .

[0086] S203: After the push-pull rod sleeve 4 is connected to the test push-pull rod 13, the carrier sleeve 8 is coaxially sleeved outside the push-pull rod sleeve 4, and then the inclination sensor 81 is reset to zero.

[0087] After the inclination sensor 81 is reset to zero, the overall angle of the inclination sensor 81 is the same as the direction of the test push-pull rod 13 .

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

[0089] S205: After the valve stem sleeve 3 is coaxially sleeved on the valve stem 1001, the carrier sleeve 8 is coaxially sleeved outside the valve stem sleeve 3, and the pitch position and yaw position of the valve 100 are adjusted so that the tilt sensor 81 returns to zero again.

[0090] Take out the carrier sleeve 8, and coaxially sleeve the carrier sleeve 8 on the valve stem sleeve 3. At this time, the inclination sensor 81 detects the inclination of the valve stem 1001. By adjusting the angle of the valve stem 1001 to zero with the Y direction as the rotation axis, and adjusting the angle of the valve stem 1001 to zero with the Z direction as the rotation axis, the valve stem 1001 is parallel to the test push-pull rod 13 in the length direction. That is, when it is necessary to perform a friction test on any test valve 100, it is only necessary to sleeve the carrier sleeve 8 on the push-pull rod sleeve 4 and the valve stem sleeve 3 in turn, and the parallel adjustment of the valve stem 1001 and the test push-pull rod 13 can be accurately achieved.

[0091] In this embodiment, if Figures 2 to 6 As shown, the test device mechanism also includes a valve fixing assembly 5, which includes a fixing seat 51, a pitch drive source 53, a pitch frame 52, a yaw drive source 55 and a yaw rotating table 56. The pitch drive source 53 is arranged on the fixing seat 51, and drives the pitch frame 52 to drive the pitch frame 52 to rotate around the Y direction. The yaw rotating table 56 is arranged on the pitch frame 52 to rotate around its axis. The axis of the yaw rotating table 56 is perpendicular to the Y direction. The yaw drive source 55 drives the yaw rotating table 56 to drive the yaw rotating table 56 to rotate around its axis. The test valve 100 can be detachably installed on the yaw rotating table 56, for example, the flange 1002 of the valve 100 is fixed on the yaw rotating table 56 by a plurality of fastening bolts, wherein the fastening bolts are exemplarily 6 or 7, etc., which are specifically set according to actual needs. More preferably, when installing the flange 1002 , one or more spacers may be added or removed between the flange 1002 and the yaw rotating platform 56 to meet different installation height requirements.

[0092] Exemplarily, the pitch drive source 53 includes a driving stepper motor and a worm gear reducer, the fixed seat 51 includes a fixed base plate and two opposite support plates vertically arranged on the fixed base plate, the pitch frame 52 is rotatably connected between the two support plates through a rotating shaft, the rotating shaft is rotatably connected to the two support plates through two rolling bearings, the pitch frame 52 is connected to the rotating shaft through a spline, the driving end of the driving 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 rotating shaft. The driving motor drives the rotating shaft to rotate through the reverse self-locking worm gear reducer to achieve a pitch angle adjustment of the pitch frame 52 of plus or minus 3°, and the reverse self-locking worm gear reducer can achieve reverse self-locking at any position.

[0093] Exemplarily, a yaw rotating table 56 is provided on the pitch frame 52 through a rotating shaft, the rotating shaft is connected to the pitch frame 52 through a rotating rolling bearing, and the valve 100 to be tested can be fixed on the yaw rotating table 56; the yaw driving source 55 includes a stepper motor and a right-angle planetary reducer, the stepper motor drives the right-angle planetary reducer, and the rotating shaft is connected to the right-angle planetary reducer through a coupling. The stepper motor provides power to drive the right-angle planetary reducer during the movement process, and the right-angle planetary reducer drives the yaw rotating table 56 to move back and forth. During the operation, the speed of the yaw rotating table 56 moving back and forth is controlled by the stepper motor. Preferably, the right-angle planetary reducer is also connected to an electromagnetic power-off brake, which can ensure timely braking in the event of an accidental power outage, thereby ensuring the safety of the dual-valve friction test device.

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

[0095] S301: Start the pitch driving source 53, so that the pitch driving 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 to make the yaw rotary table 56 rotate around its axis until the yaw angle value of the tilt sensor 81 returns to zero.

[0097] The pitch frame 52 is driven to rotate by the pitch drive source 53, so that the valve 100 rotates around the Y direction, that is, the valve stem 1001 pitches relative to the horizontal plane; then the yaw rotating platform 56 rotates around its axis to achieve parallelism between the straight line where the valve stem 1001 is located and the straight line where the push-pull rod sleeve 4 is located, so as to improve the coaxiality of the subsequent docking between the valve stem 1001 and the test push-pull force rod 13, thereby improving the accuracy of the friction test. The yaw rotating platform 56 is driven to rotate by the yaw drive source 55, thereby driving the tested valve 100 to rotate, so as to achieve the swing of the valve stem 1001 relative to the X direction, that is, the valve stem 1001 can be driven to be adjusted to be parallel to the straight line where the test push-pull force rod 13 is located. Since the valve stem 1001 has a pitch angle and a yaw angle deviation relative to the valve 100 (for example, the deviation is within plus or minus 3°), the pitch angle and yaw angle adjustment mechanism can adapt to the pitch and yaw angle deviation of the valve stem 1001 relative to the valve 100, thereby improving the measurement accuracy.

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

[0099] S303: The locking member 54 is used to limit the connection between the pitch frame 52 and the fixing seat 51, so that the pitch frame 52 and the fixing seat 51 are relatively fixed.

[0100] The test device includes a lock 54, which is disposed on the fixed seat 51 and can be connected to the pitch frame 52 or release the pitch frame 52 to limit the rotation of the pitch frame 52 relative to the fixed seat 51, or release the pitch frame 52 so that the pitch frame 52 can rotate relative to the fixed seat 51. When the pitch frame 52 is rotated to the right position, the pitch frame 52 and the fixed seat 51 are further fixed by the lock 54 to increase the rigidity of the pitch frame 52 during the test. More preferably, a plurality of locks 54 are provided, and the plurality of locks 54 can be connected to one or two support plates at intervals.

[0101] Exemplarily, the lock 54 includes a lock pin 541 and an offset fork 543, the offset fork 543 is rotatably connected to one end of the lock pin 541, and a limit head 542 is provided at the other end of the lock pin 541, a first limit hole is provided on the support plate, and a second limit hole is provided on the pitch frame 52, the lock pin 541 is movably inserted through the first limit hole and the second limit hole, and by rotating the offset fork 543, the lock pin 541 can be driven to move to the side of the lock head abutting against or away from the pitch frame 52 away from the support plate. Preferably, the second limit hole is a stepped hole, the small hole section of the stepped hole faces the first limit hole, and the large hole section faces away from the first limit 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 by a rotating pin shaft, and the locking handle is subjected to force to drive the U-shaped plate to rotate around the rotating pin shaft, and the end of the U-shaped plate can be rotated to abut against the side of the support plate away from the pitch frame 52. At this time, the locking pin 541 moves in the direction away from the pitch frame 52 until the limit 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 to drive the U-shaped plate to continue to rotate or rotate in the opposite direction around the rotating pin shaft, the end of the U-shaped plate moves away from the side of the support plate away from the pitch frame 52, and at this time, the locking pin 541 moves in the direction away from the support plate until the limit head 542 moves away from the side of the pitch frame 52 away from the support plate, thereby achieving the release of the pitch frame 52 and the fixed seat 51. Of course, in other embodiments, the locking member 54 may also be other structures. For example, the locking member 54 is a top screw threadedly connected to the support plate. By rotating the top screw, the top screw moves along the Y direction, so that the top screw abuts against or moves away from the pitch frame 52, thereby achieving the fixation or release of the pitch frame 52 and the fixing seat 51.

[0103] Furthermore, the push-pull force mechanism also includes a positioning component 11 and an X-axis driving source 12. The positioning component 11 includes a supporting frame 111, a moving frame 112, a Z-axis driving source 113, a Y-axis moving plate 115 and a Y-axis driving source 114. The Z-axis driving source 113 is arranged on the supporting frame 111 and drives the connected moving frame 112. The Y-axis driving source 114 is arranged on the moving frame 112 and drives the connected Y-axis moving plate 115. The X-axis driving source 12 is arranged on the Y-axis moving plate 115 and drives the connected test push-pull force rod 13.

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

[0105] S401: Start the Z-direction driving source 113, the Z-direction driving source 113 drives the movable frame 112 to move in the Z direction, driving the X-direction driving source 12 and the test push-pull rod 13 to move in the Z-axis direction; that is, the test push-pull rod 13 is translated in the Z direction to approach the valve stem 1001.

[0106] S402: Start the Y-direction driving source 114, which drives the X-direction driving source 12 to move in the Y direction, and drives the test push-pull rod 13 to move in the Y direction; that is, the test push-pull rod 13 is translated in the Y direction to approach the valve stem 1001.

[0107] S403: Start the X-direction driving source 12, and the X-direction driving source 12 drives the test push-pull rod 13 to approach or move away from the valve stem 1001, that is, the test push-pull rod 13 is translated in the X direction to approach the valve stem 1001.

[0108] Preferably, the support frame 111 adopts a bilaterally symmetrical structure, including two side webs arranged opposite to each other, and the Z-direction drive source 113 is located between the two side webs, so that the structure is more compact and has a higher structural strength. More preferably, the support frame 111 is provided with weight-reducing holes to reduce its weight without affecting the structural strength, which is conducive to cost saving and convenient transportation.

[0109] Exemplarily, the Z-direction driving source 113 includes a driving motor and a worm gear elevator, the driving motor is connected to the worm gear elevator, the worm gear elevator is connected to the moving frame 112, and the driving motor drives the worm gear elevator to move, thereby driving the moving frame 112 to move along the Z direction. Of course, in other embodiments, the Z-direction driving source 113 can also be other, such as a driving cylinder.

[0110] Exemplarily, the Y-direction driving source 114 includes a driving motor and a lead screw, the driving motor drives one end of the lead screw to drive the lead screw to rotate, a lead screw nut is provided on the Y-direction moving plate 115, the lead screw is threadedly connected to the lead screw nut, the driving motor drives the lead screw to rotate, and drives the Y-direction moving plate 115 to slide on the moving frame 112 along the Y direction, so as to achieve the position adjustment of the X-direction driving source 12 in the Y direction. Of course, in other embodiments, the Y-direction driving source 114 can also be other, such as a driving cylinder, etc.

[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 arranged on the centering sleeve 61. The measuring rods of the two dial indicators 63 are arranged vertically. 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 direction and the Z direction so that the spatial distance between the test push-pull rod 13 and the valve stem 1001 is within a preset range, the following further includes:

[0113] S404: The centering sleeve 61 is placed outside the zeroing jig 62, and the measuring rods of the two dial indicators 63 are respectively in contact with the outer periphery of the first section 621, and the two dial indicators 63 are zeroed;

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

[0115] S406: The position of the test push-pull rod 13 in the Y direction and the Z direction is adjusted by translation, so that the values ​​of the two dial indicators 63 are reset to zero, and the test push-pull rod 13 and the valve stem 1001 are coaxial.

[0116] Preferably, the zeroing jig 62 also includes a third section 623 coaxially arranged with the first section 621 and the second section 622. When the two dial indicators 63 are in a normal state (when no object is being measured), the measuring rods will directly extend to the farthest point, that is, the maximum measuring range. After the centering sleeve 61 is put on the zeroing jig 62, the third section 623 abuts against one end of the centering sleeve 61, and the two dial indicators 63 are zeroed. After the centering sleeve 61 is removed, the measuring rods of the two dial indicators 63 are automatically reset. At this time, the data displayed on the two dial indicators 63 are negative values. ; Then put the centering sleeve 61 on the valve stem sleeve 3, at this time, the ends of the measuring rods of the two dial gauges 63 touch the outer wall of the valve stem sleeve 3, the measuring rods of the two dial gauges 63 are forced to shrink, and the data displayed on the two dial gauges 63 are the deviation values ​​of the first section 621 and the valve stem sleeve 3; then drive the X-direction drive source 12 to make the push-pull rod sleeve 4 insert into the middle sleeve sleeve, adjust the Y-direction drive source and the Z-direction drive source 113, until the data displayed on the two dial gauges 63 are all zeroed, which means that the valve stem sleeve 3 and the push-pull rod sleeve 4 are coaxial. Among them, the graduation value of the two dial gauges 63 is 0.01mm. When the two dial gauges 63 are zeroed, it can be judged that the coaxiality of the valve stem 1001 and the test push-pull rod 13 is less than 0.1mm.

[0117] Preferably, two 90-degree-divided positioning posts 42 are vertically arranged on the push-pull rod sleeve 4, and two positioning grooves 60 are provided at one end of the centering sleeve 61, and the two positioning grooves 60 can be respectively engaged with the two positioning posts 42. When the centering sleeve 61 is sleeved outside the push-pull rod sleeve 4, the two positioning grooves 60 are respectively matched with the two positioning posts 42 to realize the positioning of the centering sleeve 61. At this time, the extended lines of the measuring rods of the two dial indicators 63 pass through the center of the diameter surface of the valve stem 1001 and are perpendicular to each other.

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

[0119] In this embodiment, automatic precise adjustment is achieved through the control module, that is, the Z-direction drive source 113, the Y-direction drive source 114, the X-direction drive source 12, the pitch drive source 53 and the yaw drive source 55 are all connected to the control module, and the start and stop and speed of the Z-direction drive source 113, the Y-direction drive source 114, the X-direction drive source 12, the pitch drive source 53 and the yaw drive source 55 are controlled by the control module to achieve precise automatic control. Among them, the control module includes a controller, and the controller can be a centralized or distributed controller, for example, the controller can be a single microcontroller, or can be composed of multiple distributed microcontrollers, and the control program can be run in the microcontroller.

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

[0121] After the carrier sleeve 8 is sleeved on the push-pull rod sleeve 4, the inclination sensor 81 is adjusted to zero;

[0122] Then, after the carrier sleeve 8 is removed and sleeved on the valve stem sleeve 3, the inclination sensor 81 displays the inclination data, and the control module receives the inclination data, controls the start-up of the pitch drive source 53 and the yaw drive source 55 according to the inclination data, and controls the driving speed and driving angle of the pitch drive source 53 and the yaw drive source 55, so that the inclination 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] According to visual inspection, the control module controls the start of the Z-direction drive source 113 and the Y-direction drive source 114 through the operation panel, so that the spatial distance between the test push-pull rod 13 and the valve stem 1001 is within a preset range, for example, within 7 mm, 8 mm or 9 mm;

[0124] Use the zeroing jig 62 to return the two dial indicators 63 to zero;

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

[0126] Continue to operate the operation panel to make the control module control the Z-direction drive source 113 and the Y-direction drive source 114 to start, and the Z-direction drive source 113 and the Y-direction drive source 114 are started to drive respectively to make the X-direction drive source 12 translate in the Z direction and the Y direction until the data displayed by the two dial indicators 63 return to zero;

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

[0128] The control module controls the X-direction driving source 12 to start through the operation panel, and the X-direction driving source 12 drives the test push-pull force rod 13 to approach the valve stem sleeve 3, and at the same time, the connecting sleeve 7 is used to connect between the valve stem sleeve 3 and the push-pull force sleeve 4;

[0129] The control module controls the X-direction drive source 12 to start through the operation panel, and inputs the moving speed and stroke of the test push-pull rod 13. The X-direction drive source 12 drives the test push-pull rod 13 to move along the axial direction of the valve stem 1001 and the test push-pull rod 13; wherein, for example, the test stroke is: 0mm~200mm; the constant speed adjustment range is: 0mm / s~6mm / s, each 1mm / s is a gear, the deviation is not more than 0.2mm / s, and the speed reaches the constant speed time within 0.05s;

[0130] The force sensor 2 detects the thrust or pull value, and the display screen displays the measured thrust or pull value, which is the friction force between the valve stem 1001 and the sealing packing in the valve body.

[0131] The dual-valve friction force testing method provided in this embodiment is simple to operate, can be applied to different valves 100, and can simultaneously adjust the installation height, pitch angle and yaw angle of the valve 100 to meet the adaptive deviation of the installation surface of the valve 100 relative to the horizontal plane by 3°; and the coaxiality of the rear valve stem 1001 and the test push-pull rod 13 is higher through adjustment, so that the test result has higher accuracy, which can provide a test result with reference significance for the study of the friction force of the sealing packing of the valve 100.

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

Claims

1. A dual valve friction force testing method, characterized in that: The test device comprises a push-pull mechanism, the push-pull mechanism comprises a test push-pull rod, and the length direction of the test push-pull rod is taken as the X direction. The test method comprises the following steps: The push-pull force mechanism and the valve are placed opposite to each other along the X direction; Measuring the pitch angle and yaw angle of the test push-pull rod; According to the pitch angle and the yaw angle, adjusting the pitch position and the yaw position of the valve 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 is coaxial with the valve stem; The valve stem and the test push-pull rod are connected by a force sensor, and the test push-pull rod is driven to move along the X direction. The force sensor displays the pulling force, which is the friction force between the valve stem and the sealing packing in the valve body.

2. The double valve friction force testing method according to claim 1, characterized in that: Connecting the valve stem and the test push-pull rod comprises: A valve stem sleeve is coaxially sleeved on one end of the valve stem, and a first screw is protruding from the end of the valve stem sleeve away from the valve stem; A push-pull rod sleeve is coaxially connected to one end of the test push-pull rod through the force sensor, and a second screw is protruded from the end of the push-pull rod sleeve away from the test push-pull rod, and the thread on the second screw is opposite to the thread on the first screw; A connecting sleeve is used to threadably connect the first screw rod and the second screw rod.

3. The double valve friction force testing method according to claim 2, characterized in that: Measuring the pitch angle and yaw angle of the test push-pull rod includes: Prepare a carrier sleeve; Installing a tilt sensor outside the carrier sleeve parallel to the axis of the carrier sleeve; After the push-pull rod sleeve is connected to the test push-pull rod, the carrier sleeve is coaxially sleeved outside the push-pull rod sleeve, and then the inclination sensor is reset to zero.

4. The double valve friction force testing method according to claim 3, characterized in that: After the tilt sensor is reset to zero, the following steps are also included: Remove the carrier sleeve from the push-pull rod sleeve; After the valve stem sleeve is coaxially sleeved on the valve stem, the carrier sleeve is coaxially sleeved outside the valve stem sleeve, and the pitch position and yaw position of the valve are adjusted so that the inclination sensor returns to zero again.

5. The double valve friction force testing method according to claim 4, characterized in that: The testing device mechanism also includes a fixed seat, a pitch drive source, a pitch frame 52, a yaw drive source and a yaw rotating table. The pitch drive source is arranged on the fixed seat and is driven to connect to the pitch frame 52, and can drive the pitch frame 52 to rotate around the Y direction. The yaw rotating table is arranged on the pitch frame 52 to rotate around its axis. The axis of the yaw rotating table is perpendicular to the Y direction. The yaw drive source is driven to connect to the yaw rotating table. Before the test, the flange of the valve is fixed to the yaw rotating table by bolts. Adjusting the pitch position and yaw position of the valve includes: Starting the pitch driving source so that the pitch driving source drives the pitch frame 52 to rotate around the Y direction until the pitch angle value of the inclination sensor returns to zero; The yaw driving source is started to make the yaw rotating platform rotate around its axis until the yaw angle value of the inclination sensor returns to zero.

6. The double valve friction force testing method according to claim 5, characterized in that: The testing device further includes a locking device, and after the pitch angle value of the inclination sensor is reset to zero, the testing device further includes: The locking member is connected to the pitch frame 52 and the fixing seat in a limiting manner, so that the pitch frame 52 and the fixing seat are relatively fixed.

7. The double valve friction force testing method according to claim 2, characterized in that: The test device also includes a centering mechanism, which includes a centering sleeve and a zeroing fixture. The centering sleeve is provided with two dial indicators, and the measuring rods of the two dial indicators are vertically arranged. The zeroing fixture includes a coaxial first section and a second section. The first section has the same shape and size as the valve stem sleeve, and the second section has the same shape and size 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 direction and the Z direction so that the spatial distance between the test push-pull rod and the valve stem is within a preset range; The centering sleeve is sleeved outside the zeroing jig, and the measuring rods of the two dial indicators are respectively in contact with the outer periphery of the first section, and the two dial indicators are zeroed; Remove the centering sleeve from the zeroing jig, sleeve one end of the centering sleeve outside the valve stem sleeve, the two dial indicators display values, move the test push-pull rod so that the push-pull rod sleeve is sleeved into the other end of the centering sleeve; The positions of the test push-pull rod in the Y-axis direction and the Z-axis direction are adjusted so that the values ​​of the two dial indicators are reset to zero and the test push-pull rod and the valve stem are coaxial.

8. The double valve friction force testing method according to claim 7, characterized in that: The push-pull mechanism also includes a positioning component and an X-axis driving source, the positioning component includes a support frame, a mobile frame, a Z-axis driving source, a Y-axis moving plate and a Y-axis driving source, the Z-axis driving source is arranged on the support frame and is driven to connect the moving frame, the Y-axis driving source is arranged on the mobile frame and is driven to connect the Y-axis moving plate, the X-axis driving source is arranged on the Y-axis moving plate and is driven to connect the test push-pull rod, and adjusting the spatial distance between the test push-pull rod and the valve stem within a preset range includes: Starting the Z-direction driving source, the Z-direction driving source drives the moving frame to move in the Z direction, and drives the X-direction driving source and the test push-pull rod to move in the Z direction; The Y-direction driving source is started, and the Y-direction driving source drives the X-direction driving source to move in the Y direction, thereby driving the test push-pull rod to move in the Y direction; The X-direction driving source is started, and the X-direction driving source 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 stem, the method further comprises: Moving the test push-pull rod along the X direction so that the push-pull rod sleeve is separated from the centering sleeve; Remove the centering sleeve from the valve stem sleeve.

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