Double-valve friction force testing device

Abstract

The utility model relates to the technical field of double-valve friction force testing equipment, and discloses a double-valve friction force testing device, which comprises a valve fixing mechanism and a push-pull force mechanism, the valve fixing mechanism comprises a fixing seat, a tested valve is movably arranged on the fixing seat, the tested valve is provided with a valve rod, and the push-pull force mechanism is arranged on the valve rod. The angle of the valve rod relative to the fixing base is adjustable with the Y direction and the Z direction as the axis. The push-pull force mechanism and the valve fixing mechanism are oppositely arranged in the X direction, the push-pull force mechanism comprises a position adjusting assembly and a push-pull force driving part, the push-pull force driving part is arranged on the position adjusting assembly in the Y direction and the Z direction in a position adjustable mode, and the driving end of the push-pull force driving part can move in the X direction; the driving end of the push-pull force driving piece is detachably and coaxially connected with one end of the valve rod through the force sensor.

Description

Technical Field

[0001] This utility model relates to the technical field of dual-valve friction force testing equipment, and in particular to a dual-valve friction force testing device. 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 at the top and directly driving the valve core to move or rotate, thus achieving valve opening and closing or regulation. 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 frictional force of the axial reciprocating linear motion of the valve stem and valve body sealing packing is measured by connecting the valve stem to a drive source fixed on the worktable and applying a pulling force to the valve stem. The drive source and the valve under test are in relatively fixed positions, making it difficult for the test equipment to be applied to different valves under test, resulting in poor flexibility in use. Furthermore, it is impossible to guarantee the coaxiality of the valve stem and the drive end of the drive source during the test, which affects the test accuracy.

[0003] Therefore, there is an urgent need for a dual-valve friction force testing device to solve the above problems. Utility Model Content

[0004] Based on the above, the purpose of this utility model is to provide a dual-valve friction force testing device that is suitable for different tested valves and has high testing accuracy.

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

[0006] A dual-valve friction force testing device, comprising:

[0007] A valve fixing mechanism includes a fixing seat, on which the valve under test is movably mounted. The valve under test has a valve stem, and the valve stem is adjustable relative to the fixing seat with respect to the Y and Z directions as axes, respectively.

[0008] A push-pull force mechanism is arranged opposite to the valve fixing mechanism along the X direction. The push-pull force mechanism includes an adjustment component and a push-pull force drive component. The push-pull force drive component is adjustablely arranged on the adjustment component in the Y and Z directions. The drive end of the push-pull force drive component can move along the X direction. The drive end of the push-pull force drive component is detachably coaxially connected to one end of the valve stem through a force sensor.

[0009] As a preferred embodiment of a dual-valve friction force testing device, the valve fixing mechanism further includes:

[0010] The pitch frame is rotatably mounted on the fixed base about the Y direction, and the valve under test is rotatably mounted on the pitch frame about its axis.

[0011] A pitch drive source is mounted on the fixed base and drives the pitch frame. The pitch drive source can drive the pitch frame to rotate around the Y direction.

[0012] As a preferred embodiment of a dual-valve friction force testing device, the valve fixing mechanism further includes:

[0013] A locking element is provided on the fixed base and can be connected to or released from the pitch frame to limit the rotation of the pitch frame relative to the fixed base, or to release the pitch frame to allow the pitch frame to rotate relative to the fixed base.

[0014] As a preferred embodiment of a dual-valve friction force testing device, the valve fixing mechanism further includes a yaw drive source and a yaw rotary table. The yaw rotary table is rotatably mounted on the pitch frame. The valve under test is detachably mounted on the yaw rotary table. The yaw drive source drives and connects to the yaw rotary table, enabling the yaw rotary table to rotate around its own axis. The axis of the yaw rotary table is perpendicular to the Y direction.

[0015] As a preferred embodiment of a dual-valve friction force testing device, it also includes:

[0016] The centering mechanism includes a sensor sleeve and an angle sensor mounted on the sensor sleeve. The two ends of the sensor sleeve are detachably coaxially sleeved on the drive end of the push-pull force drive and one end of the valve stem.

[0017] As a preferred embodiment of a dual-valve friction force testing device, it further includes a connecting sleeve, the two ends of which can be detachably connected to the driving end of the push-pull force driving component and one end of the valve stem, respectively.

[0018] As a preferred embodiment of a dual-valve friction force testing device, it further includes a valve stem sleeve and a push-pull force sleeve. One end of the valve stem sleeve is threaded to one end of the valve stem, and the other end is provided with a first external thread rod. One end of the push-pull force sleeve is connected to the driving end of the push-pull force driving component through the force sensor, and the other end is provided with a second external thread rod. Both ends of the connecting sleeve can be threadedly connected to the first external thread rod and the second external thread rod at the same time.

[0019] As a preferred embodiment of a dual-valve friction force testing device, it also includes:

[0020] A coaxial adjusting sleeve is detachably fitted at both ends to the valve stem sleeve and the push-pull sleeve, respectively. A first dial indicator and a second dial indicator are provided on the coaxial adjusting sleeve. The measuring rods of the first dial indicator and the second dial indicator are vertically arranged and can respectively abut against the outer periphery of the valve stem sleeve located inside the coaxial adjusting sleeve.

[0021] As a preferred embodiment of a dual-valve friction force testing device, the adjustment assembly further includes:

[0022] The Z-axis lifting structure includes a support frame, a movable frame, and a Z-axis drive source. The movable frame is slidably connected to the support frame along the Z-direction, and the Z-axis drive source is connected to the movable frame and can drive the movable frame to slide along the Z-direction.

[0023] The Y-axis moving structure includes a Y-axis drive source and a Y-axis moving plate. The Y-axis moving plate is slidably mounted on the moving frame. The push-pull force driving component is mounted on the Y-axis moving plate. The Y-axis drive source is mounted on the moving frame and drives the Y-axis moving plate, enabling the Y-axis moving plate to slide along the Y direction.

[0024] As a preferred embodiment of a dual-valve friction force testing device, it further includes a test platform covered with a protective cover. The valve fixing mechanism and the push-pull force mechanism are both located on the test platform and inside the protective cover.

[0025] The beneficial effects of this utility model are as follows:

[0026] This invention provides a dual-valve friction force testing device, which includes a valve fixing mechanism and a push-pull force mechanism. When a tensile test is required, the valve under test is mounted on a fixed base. By adjusting the position of the push-pull force drive source in the Y and Z directions, the drive source can be moved closer to or further away from the valve under test, facilitating the connection between the drive end of the push-pull force drive and the valve stem. Simultaneously, by adjusting the angle of the valve stem with respect to the Y and Z directions, the valve stem can be aligned with the drive direction of the push-pull force drive, improving the connection accuracy and the accuracy of the friction force test. By driving the push-pull force rod to move along the X direction, a tensile force is applied to the valve stem. Friction is generated between the valve stem and the valve body sealing packing of the valve under test. The push or pull force detected by the force sensor at this time is the friction force between the valve stem and the sealing packing. This dual-valve friction force testing device, by setting the adjustable angle of the valve stem relative to the fixed base and the adjustable position of the push-pull force drive, is applicable to different valves under test, facilitating the connection between different valves and the push-pull force drive, offering good flexibility and high testing accuracy. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0028] Figure 1 This is a side view of the dual-valve friction force testing device provided in this embodiment of the utility model;

[0029] Figure 2 This is a side view of the structure after the valve stem and the push-pull force driving component are connected according to an embodiment of this utility model;

[0030] Figure 3 This is a partial structural schematic diagram of the dual-valve friction force testing device provided in one view according to an embodiment of the present invention;

[0031] Figure 4 This is a partial structural schematic diagram of the dual-valve friction force testing device provided in another embodiment of the present invention;

[0032] Figure 5 This is a partial top view of the dual-valve friction force testing device provided in this embodiment of the utility model;

[0033] Figure 6 This is a partial structural side view of the dual-valve friction force testing device provided in this embodiment of the utility model;

[0034] Figure 7This is a partial structural schematic diagram of the valve fixing mechanism provided in this embodiment of the utility model;

[0035] Figure 8 This is a partial structural schematic diagram of the fixing base provided in an embodiment of the present utility model;

[0036] Figure 9 This is a schematic diagram of the structure of the connecting sleeve provided in an embodiment of the present utility model;

[0037] Figure 10 This is a schematic diagram of the structure of the coaxial adjusting sleeve provided in this embodiment of the utility model. Figure 1 ;

[0038] Figure 11 This is a schematic diagram of the structure of the coaxial adjusting sleeve provided in this embodiment of the utility model. Figure 2 ;

[0039] Figure 12 This is a side view of the coaxial adjusting sleeve provided in an embodiment of the present utility model;

[0040] Figure 13 This is a schematic diagram of the zeroing fixture provided in this embodiment of the utility model;

[0041] Figure 14 This is a schematic diagram of the push-pull sleeve provided in an embodiment of the present invention;

[0042] Figure 15 This is a side view of the push-pull sleeve provided in this embodiment of the utility model;

[0043] Figure 16 This is a schematic diagram of the structure of the valve stem sleeve provided in this embodiment of the utility model. Figure 1 ;

[0044] Figure 17 This is a schematic diagram of the structure of the valve stem sleeve provided in this embodiment of the utility model. Figure 2 ;

[0045] Figure 18 This is a side view of the valve stem sleeve provided in an embodiment of this utility model;

[0046] Figure 19 This is a schematic diagram of the structure of the sensor sleeve provided in this embodiment of the utility model. Figure 1 ;

[0047] Figure 20 This is a schematic diagram of the structure of the sensor sleeve provided in this embodiment of the utility model. Figure 2 ;

[0048] Figure 21 This is a side view of the sensor sleeve provided in an embodiment of the present invention;

[0049] Figure 22 This is a cross-sectional view of the sensor sleeve fitted onto the push-pull force sleeve according to an embodiment of the present invention;

[0050] Figure 23 This is a cross-sectional view of the sensor sleeve fitted onto the valve stem sleeve according to an embodiment of the present invention;

[0051] Figure 24 This is a cross-sectional view of the coaxial adjusting sleeve fitted on the valve stem sleeve and the push-pull force sleeve provided in this embodiment of the utility model;

[0052] Figure 25 This is a cross-sectional view of the coaxial adjusting sleeve provided in this embodiment of the utility model being fitted onto the zeroing fixture.

[0053] In the picture:

[0054] 1. Valve fixing mechanism; 11. Fixing seat; 12. Pitch frame; 13. Pitch drive source; 14. Locking element; 141. Locking pin; 142. Limiting head; 143. Offset fork; 15. Yaw drive source; 16. Yaw rotary table; 2. Push-pull force mechanism; 21. Adjustment assembly; 211. Z-axis lifting structure; 2111. Support frame; 2112. Moving frame; 212. Y-axis moving structure; 2121. Y-axis drive source; 2122. Y-axis moving plate; 22. Push-pull force drive component; 23. Force sensor; 3. Centering mechanism; 31. Sensor sleeve 32. Tilt sensor; 4. Connecting sleeve; 5. Valve stem sleeve; 51. First external threaded rod; 6. Push-pull sleeve; 61. Second external threaded rod; 62. Positioning pin; 7. Coaxial adjusting sleeve; 70. Positioning groove; 71. First dial indicator; 72. Second dial indicator; 8. Zeroing fixture; 81. First section; 82. Second section; 83. Third section; 10. Cabinet; 101. Universal caster; 102. Support leg; 20. Test cabinet; 201. Test bench; 202. Protective cover; 100. Valve; 1001. Valve stem; 1002. Flange. Detailed Implementation

[0055] 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 present 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, not the entire structure.

[0056] In the description of this utility model, 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 utility model based on the specific circumstances.

[0057] 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.

[0058] 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 this utility model. In the description of this utility model, 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.

[0059] like Figures 1 to 25As shown, this embodiment provides a dual-valve friction force testing device. This device is used to measure the friction force between the valve stem 1001 of the valve 100 and the valve body sealing packing during axial reciprocating linear motion. By applying a push-pull force to the valve 100, and using a force sensor 23 to detect the magnitude of the applied push-pull force, the friction force is measured. Specifically, the dual-valve friction force testing device includes a cabinet 10 and a test cabinet 20. The cabinet 10 houses a power supply and a control module. The test cabinet 20 is located on the cabinet 10 and contains a testing mechanism connected to the control module. The testing mechanism is used to test the friction force between the valve stem 1001 and the sealing packing on the valve 100. The control module controls the start / stop of the testing mechanism and the test parameters. The integrated dual-valve friction force testing device is easy to move and use. Preferably, the bottom of the cabinet 10 is equipped with multiple universal casters 101, which facilitate the movement of the dual-valve friction force testing device, saving manpower. More preferably, the bottom of the cabinet 10 is provided with multiple support legs 102, and the universal casters 101 are telescopic. By telescopically extending the universal casters 101, either the universal casters 101 or the support legs 102 can support the ground to meet the requirements of stable parking and movement. The universal casters 101 can optionally, but are not limited to, be connected to the bottom of the cabinet 10 via telescopic rods.

[0060] In this embodiment, as Figure 1 As shown, the test cabinet 20 includes a test platform 201 and a protective cover 202. The protective cover 202 is placed over the test platform 201, forming a test space between the protective cover 202 and the test platform 201. The test mechanism is located within the test space, and the test is conducted within the test space. The protective cover 202 ensures the safety of the test and reduces the impact of test noise on the external environment.

[0061] Specifically, the test bench 201 is equipped with a valve fixing mechanism 1 and a push-pull force mechanism 2 arranged opposite each other along the X direction. Both the valve fixing mechanism 1 and the push-pull force mechanism 2 are located in the test space. The valve fixing mechanism 1 includes a fixing seat 11, on which the valve under test 100 is movably mounted. The valve under test 100 has a valve stem 1001, and the valve stem 1001 is adjustable relative to the fixing seat 11 with the Y and Z directions as axes, respectively. The push-pull force mechanism 2 is arranged opposite to the valve fixing mechanism 1 along the X direction. The push-pull force mechanism 2 includes an adjustment component and a push-pull force drive component 22. The push-pull force drive component 22 is adjustable in position on the adjustment component 21 in the Y and Z directions. The push-pull force drive component 22 is connected to a control module, which can control the start / stop, driving direction, and driving force of the push-pull force drive component 22. The driving end of the push-pull force drive component 22 is detachably coaxially connected to one end of the valve stem 1001 through a force sensor 23. Here, the X direction is the length direction of the push-pull force rod. When a push-pull force test is required, the valve under test 100 is mounted on the fixed base 11. By adjusting the position of the push-pull force drive 22 in the Y and Z directions, the push-pull force drive 22 can be brought closer to or further away from the valve under test 100, facilitating the connection between the drive end of the push-pull force drive 22 and the valve stem 1001. At the same time, by adjusting the angle of the valve stem 1001 on the valve 100 with the Y and Z directions as axes, the valve stem 1001 can be adjusted to be coaxial with the drive direction of the push-pull force drive 22, improving the connection accuracy and the accuracy of the friction force test. By driving the drive end of the push-pull force drive to move along the X direction, a pull or push force is applied to the valve stem 1001. The valve stem 1001 generates friction with the valve body sealing packing of the valve under test 100. At this time, the pull or push force detected by the force sensor 23 is the friction force between the valve stem 1001 and the sealing packing. This dual-valve friction force testing device has a flexible adjustment function, allowing the valve mounting surface to have an adaptive deviation of, for example, 3° relative to the horizontal plane. By setting the angle of the valve stem 1001 relative to the fixed seat 11 to be adjustable and the position of the push-pull force driving component 22 to be adjustable, it can be used for different test valves 100, making it convenient for different test valves 100 to be connected with the push-pull force driving component 22. It has good flexibility of use and high testing accuracy.

[0062] In this embodiment, as Figure 2 and Figure 9 As shown, the valve stem 1001 and the drive end of the push-pull force drive 22 are connected by a connecting sleeve 4. The two ends of the connecting sleeve 4 are detachably connected to the drive ends of the valve stem 1001 and the push-pull force drive 22, respectively. After adjusting the position of the valve stem 1001 and the drive end of the push-pull force drive 22, the connection between the valve stem 1001 and the drive end of the push-pull force drive 22 is achieved by connecting the connecting sleeve 4 while the drive end of the push-pull force drive 22 moves. Then, the drive end of the push-pull force drive 22 moves to start the test.

[0063] Specifically, the push-pull force drive component 22 is a servo electric cylinder, which can achieve precise speed control, precise position control, and precise push-pull force control. The free end of the drive rod of the servo electric cylinder is coaxially connected to a push-pull force sleeve 6 via a force sensor 23. The end of the push-pull force sleeve 6 opposite to the servo electric cylinder is detachably coaxially connected to one end of the valve stem 1001; alternatively, the servo electric cylinder contains a force sensor 23, and the free end of the drive rod of the servo electric cylinder is coaxially connected to the push-pull force sleeve 6. The end of the push-pull force sleeve 6 opposite to the servo electric cylinder is detachably coaxially connected to one end of the valve stem 1001. Preferably, a displacement sensor is also provided on the push-pull force rod. The displacement sensor is used to detect the displacement of the drive end of the push-pull force drive component 22 relative to the valve stem 1001 in the X direction. During testing, the measured displacement is the displacement of the valve stem 1001 relative to the sealing packing. The displacement is proportional to the measured force, facilitating further analysis of the friction force in subsequent tests. The displacement sensor may be, but is not limited to, a magnetostrictive displacement sensor.

[0064] More specifically, if Figure 2 ,like Figures 14 to 18 As shown, the dual-valve friction force testing device also includes a valve stem sleeve 5. One end of the valve stem 1001 is provided with a first external thread, and one end of the valve stem sleeve 5 is provided with a first internal thread. The valve stem 1001 and the valve stem sleeve 5 are detachably connected by the first internal thread and the first external thread. The other end of the valve stem sleeve 5 is provided with a first external thread rod 51. The end of the push-pull sleeve 6 away from the servo electric cylinder is provided with a second external thread rod 61. The two ends of the connecting sleeve 4 are respectively provided with second internal threads. The two second internal threads are respectively threaded to the first external thread rod 51 and the second external thread rod 61 to realize the connection between the connecting sleeve 4 and the valve stem sleeve 5 and the push-pull sleeve 6. While the push-pull force drive component 22 drives the push-pull force sleeve 6 to approach the valve stem sleeve 5, the connecting sleeve 4 is rotated. One end of the connecting sleeve 4 is connected to the first external thread rod 51 through the second internal thread, and the other end of the connecting sleeve 4 is connected to the second external thread rod 61 through the second internal thread. The connection has good stability and structural strength, and is easy to assemble and disassemble.

[0065] Furthermore, such as Figures 2 to 8As shown, the valve fixing mechanism 1 also includes a pitch frame 12 and a pitch drive source 13. The pitch frame 12 is rotatably mounted on the fixed base 11 around the Y direction. The valve under test 100 is rotatably mounted on the pitch frame 12 around its axis. The pitch drive source 13 is mounted on the fixed base 11 and connected to the control module. The control module can control the start and stop of the pitch drive source 13. The pitch drive source 13 drives the pitch frame 12 and can drive the pitch frame 12 to rotate around the Y direction. After the valve under test 100 is mounted on the pitch frame 12, the straight line of the valve stem 1001 may not be parallel to the straight line of the push-pull sleeve 6. That is, it is necessary to first adjust the valve stem 1001 so that its straight line is parallel to the straight line of the push-pull sleeve 6. Then, by adjusting the position of the push-pull drive component 22, the push-pull sleeve 6 can be coaxial with the valve stem 1001 to achieve subsequent precise docking. The pitch drive source 13 drives the pitch frame 12 to rotate, causing the valve under test 100 to rotate around the Y direction, thus making the valve stem 1001 pitch relative to the test platform 201. Then, by rotating the valve under test 100 around its axis, the straight line of the valve stem 1001 is made parallel to the straight line of the push-pull sleeve 6, so as to improve the coaxiality of the subsequent valve stem 1001 and the push-pull drive component 22, thereby improving the accuracy of friction force testing.

[0066] For example, the pitch drive source 13 includes a drive stepper motor and a worm gear reducer. The fixed base 11 includes a fixed base plate and two opposing support plates vertically mounted on the fixed base plate. The pitch frame 12 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 12 and the rotary shaft are connected via splines. The drive end of the drive 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 through the reverse-locking worm gear reducer, thereby adjusting the pitch angle of the pitch frame 12 by ±3°. The reverse-locking worm gear reducer can achieve reverse self-locking at any position.

[0067] Preferably, the valve fixing mechanism 1 further includes a locking member 14, which is disposed on the fixed base 11 and can be connected to or released from the pitch frame 12 to limit its rotation relative to the fixed base 11, or to release the pitch frame 12 to allow it to rotate relative to the fixed base 11. When the pitch frame 12 has rotated to its position, the locking member 14 further secures the pitch frame 12 and the fixed base 11, increasing the rigidity of the pitch frame 12 during testing. More preferably, multiple locking members 14 are provided, and these multiple locking members 14 can be connected to one or two support plates at intervals.

[0068] For example, the lock 14 includes a locking pin 141 and an offset fork 143. The offset fork 143 is rotatably connected to one end of the locking pin 141, and the other end of the locking pin 141 is provided with a limiting head 142. A first limiting hole is provided on the support plate, and a second limiting hole is provided on the pitch frame 12. The locking pin 141 is movably inserted through the first limiting hole and the second limiting hole. By rotating the offset fork 143, the locking pin 141 can be moved to a position where the lock head abuts against or moves away from the side of the pitch frame 12 that is 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.

[0069] Specifically, the offset fork 143 includes a U-shaped plate and a locking handle. One end of the locking pin 141 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 12. At this time, the locking pin 141 moves away from the pitch frame 12 until the limiting head 142 abuts against the step surface in the step hole, thereby achieving relative fixation of the pitch frame 12 and the fixed seat 11. 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 12. At this time, the locking pin 141 moves away from the support plate until the limiting head 142 moves away from the pitch frame 12 away from the support plate, thereby releasing the pitch frame 12 and the fixed seat 11. Of course, in other embodiments, the locking member 14 can also be other structures. For example, the locking member 14 is a set screw that is 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 12, thereby fixing or releasing the pitch frame 12 and the fixed seat 11.

[0070] Specifically, the valve fixing mechanism 1 also includes a yaw drive source 15 and a yaw rotary table 16. The yaw rotary table 16 is rotatably mounted on the pitch frame 12. The yaw drive source 15 is connected to the control module, which can control the start and stop of the yaw drive source 15. The yaw drive source 15 drives the yaw rotary table 16, which rotates around its own axis. The axis of the yaw rotary table 16 is perpendicular to the Y direction. The valve under test 100 can be detachably mounted on the yaw rotary table 16, for example, by fixing the mounting flange 1002 of the valve 100 to the yaw rotary table 16 with several fastening bolts. The fastening bolts are exemplarily 6 or 7, etc., depending on the actual needs. By driving the yaw rotary table 16 to rotate through the yaw drive source 15, the valve under test 100 is driven to rotate, realizing the swing 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 where the push-pull sleeve 6 is located. 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 these deviations, improving measurement accuracy. Preferably, when the valve 100 is mounted on the yaw rotary table 16, the height of the valve 100 mounting base can be adjusted by adding or removing shims between the valve 100 mounting flange 1002 and the yaw rotary table 16.

[0071] For example, a yaw rotary table 16 is rotatably mounted on the pitch frame 12 via a rotary shaft. The rotary shaft is connected to the pitch frame 12 via a rotating rolling bearing, and the valve under test 100 can be fixed on the yaw rotary table 16. The yaw drive source 15 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 16 to move back and forth. The speed of the yaw rotary table 16 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.

[0072] In another embodiment, the valve fixing mechanism 1 further includes a rotating frame, which is rotatably mounted on the fixed base 11. A pitch seat is flipped on the rotating frame, and the valve 100 is detachably mounted on the pitch seat. Rotation of the rotating frame allows the valve 100 to rotate about the Z-axis, and flipping of the pitch seat allows the valve 100 to rotate about the Y-axis, thus adjusting the yaw and pitch angles of the valve stem 1001. It should be noted that the valve fixing mechanism 1 only needs to allow the valve 100 to rotate in two directions perpendicular to the X-axis.

[0073] Furthermore, such as Figures 19 to 25 As shown, the dual-valve friction force testing device also includes a centering mechanism 3. The centering mechanism 3 includes a sensor sleeve 31 and an angle sensor 32 disposed on the sensor sleeve 31. Both ends of the sensor sleeve 31 are detachably sleeved on the driving end of the push-pull force driving component 22 and one end of the valve stem 1001. Specifically, one end of the sensor sleeve 31 is coaxially adapted to the outside of the push-pull force sleeve 6, and the other end is coaxially adapted to the outside of the valve stem sleeve 5. Preferably, the angle sensor 32 is a triaxial angle sensor. Before connecting the valve stem 1001 and the drive end of the push-pull force drive 22, the sensor sleeve 31 is coaxially fitted onto the push-pull force sleeve 6, and then the tilt sensor 32 is zeroed. At this time, the overall angle of the tilt sensor 32 is the same as the driving direction of the push-pull force drive 22. The sensor sleeve 31 is then removed and coaxially fitted onto the valve stem sleeve 5. The tilt sensor 32 detects the tilt angle of the valve stem 1001. By adjusting the angle at which the valve stem 1001 rotates around the Y-axis and the Z-axis, the driving directions of the valve stem 1001 and the push-pull force drive 22 are made spatially parallel. That is, when performing friction force testing on any tested valve 100, simply fitting the sensor sleeve 31 onto the push-pull force sleeve 6 and the valve stem sleeve 5 sequentially will accurately achieve parallel adjustment of the driving directions of the valve stem 1001 and the push-pull force drive 22. The tilt sensor 32 is connected to the control module. Based on the initial angle of the valve stem 1001 detected by the tilt sensor 32, the control module controls the pitch drive source 13 and the yaw drive source 15 to achieve automatic adjustment of the valve stem 1001 angle. The adjustment accuracy is high, and it saves time and effort.

[0074] After adjusting the spatial parallelism of the driving direction of the valve stem 1001 push-pull force drive component 22, adjust the spatial position of the push-pull force sleeve 6 so that the push-pull force sleeve 6 is close to the valve stem sleeve 5. Specifically, as follows: Figures 1 to 6 As shown, the adjustment component 21 includes a Y-axis moving structure 212 and a Z-axis lifting structure 211. The Z-axis lifting structure 211 includes a support frame 2111, a moving frame 2112, and a Z-axis drive source. The moving frame 2112 is slidably connected to the support frame 2111 along the Z-direction, preferably connected to the support frame 2111 via a slide rail and a slider to improve sliding smoothness. The Z-axis drive source is connected to a control module, which can control the start and stop of the Z-axis drive source. The Z-axis drive source drives the moving frame 2112 to slide along the Z-direction. The Y-axis moving structure 212 is disposed on the moving frame 2112, and the push-pull force drive component 22 is disposed on the Y-axis moving structure 212. By driving the moving frame 2112 to slide on the support frame 2111 through the Z-axis drive source, the position of the Y-axis moving structure 212 in the Z-direction is adjusted, thereby realizing the position adjustment of the push-pull force drive component 22 in the Z-direction.

[0075] Preferably, the support frame 2111 adopts a symmetrical structure, including two opposing side webs, with the Z-axis drive source located between the two side webs, resulting in better structural compactness and higher structural strength. More preferably, the support frame 2111 is provided with weight-reduction holes, which reduces its weight without affecting structural strength, thus saving costs and facilitating transportation.

[0076] For example, the Z-axis drive source includes a drive motor and a worm gear jack. The drive motor drives the worm gear jack, which in turn drives the movable frame 2112. The drive motor drives the worm gear jack to move, thereby causing the movable frame 2112 to move along the Z-direction. Of course, in other embodiments, the Z-axis drive source can be other types, such as a drive cylinder.

[0077] More specifically, the Y-direction moving structure 212 includes a Y-direction drive source 2121 and a Y-direction moving plate 2122. The Y-direction drive source 2121 is mounted on the moving frame 2112 and is connected to a control module. The control module can control the start and stop of the Y-direction drive source 2121. The Y-direction drive source 2121 drives the Y-direction moving plate 2122 to move along the Y direction. The Y-direction moving plate 2122 is preferably slidably mounted on the moving frame 2112 via a slide rail and a slider to improve the smoothness and stability of the movement. The push-pull force driving component 22 is mounted on the Y-direction moving plate 2122. For example, the Y-axis drive source 2121 includes a drive motor and a lead screw. The drive motor drives one end of the lead screw to rotate. A lead screw nut is provided on the Y-axis moving plate 2122, 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 2122 is driven to slide along the Y direction on the moving frame 2112, thereby realizing the position adjustment of the push-pull force drive component 22 in the Y direction. Of course, in other embodiments, the Y-axis drive source 2121 can also be other types, such as a drive cylinder.

[0078] After the push-pull sleeve 6 is driven close to the valve stem sleeve 5 by the Y-axis moving structure 212, the Z-axis lifting structure 211, and the push-pull force driving component 22, the valve stem sleeve 5 and the push-pull sleeve 6 are coaxially adjusted. Specifically, as shown... Figures 10 to 25As shown, the dual-valve friction force testing device also includes a coaxial adjusting sleeve 7. The two ends of the coaxial adjusting sleeve 7 are detachably sleeved on the driving end of the push-pull force driving component 22 and one end of the valve stem 1001, respectively. Specifically, it is sleeved outside the push-pull force sleeve 6 and the valve stem sleeve 5. A first dial indicator 71 and a second dial indicator 72 are provided on the coaxial adjusting sleeve 7. The measuring rods of the first dial indicator 71 and the second dial indicator 72 are vertically arranged and can respectively abut against the outer periphery of the valve stem sleeve 5 located inside the coaxial adjusting sleeve 7. During coaxial adjustment, the alignment error between the push-pull sleeve 6 and the valve stem sleeve 5 is kept within a preset range by the Y-axis moving structure 212, the Z-axis lifting structure 211 and the push-pull force drive component 22, for example, within 7mm, 8mm or 9mm. Then, the coaxial adjusting sleeve 7 is fitted onto the valve stem sleeve 5 and the push-pull sleeve 6. The push-pull sleeve 6 is adjusted slightly by the Y-axis moving structure 212 and the Z-axis lifting structure 211 so that the coaxiality between the push-pull sleeve 6 and the valve stem sleeve 5 is less than a preset value, for example, less than 0.1mm.

[0079] In this embodiment, before adjusting the coaxiality of the push-pull sleeve 6 and the valve stem sleeve 5, the first dial indicator 71 and the second dial indicator 72 are zeroed. Specifically, the dual-valve friction force testing device also includes a zeroing fixture 8, which includes a coaxial first section 81, a second section 82 and a third section 83. The outer diameter of the first section 81 is adapted to the outer diameter of the push-pull sleeve 6, and the shape and size of the second section 82 are the same as those of the valve stem sleeve 5. In normal operation (when no object is being measured), the measuring rods of dial indicators 71 and 72 will extend directly to their maximum range. After the coaxial adjusting sleeve 7 is placed on the zeroing fixture 8, the third section 83 abuts against one end of the coaxial adjusting sleeve 7, and dial indicators 71 and 72 are zeroed. After removing the coaxial adjusting sleeve 7, the measuring rods of dial indicators 71 and 72 automatically reset, and the data displayed on dial indicators 71 and 72 are negative. Then, the coaxial adjusting sleeve 7 is placed on the valve stem sleeve 5, at which point the end of the measuring rod of dial indicator 71 abuts against... When the outer peripheral wall of the valve stem sleeve 5 and / or the measuring rod end of the second dial indicator 72 abuts against the outer peripheral wall of the valve stem sleeve 5, the measuring rods of the first dial indicator 71 and / or the second dial indicator 72 are compressed under force, and the data displayed on the first dial indicator 71 and / or the second dial indicator 72 is the deviation value between the first segment 81 and the valve stem sleeve 5. Then, the push-pull force drive 22 is driven to make the push-pull force sleeve 6 fit into the coaxial adjusting sleeve 7. The Y-axis moving structure 212 and the Z-axis lifting structure 211 are adjusted until the data displayed on the first dial indicator 71 and the second dial indicator 72 are both zero, which means that the valve stem sleeve 5 and the push-pull force sleeve 6 are coaxial. The graduation value of the first dial indicator 71 and the second dial indicator 72 is 0.01mm. When the first dial indicator 71 and the second dial indicator 72 are zero, it can be determined that the coaxiality between the valve stem 1001 and the push-pull force sleeve 6 is less than 0.1mm.

[0080] Preferably, the push-pull sleeve 6 has two 90-degree graduated positioning pins 62 vertically spaced at intervals, and one end of the coaxial adjusting sleeve 7 has two positioning grooves 70, which can respectively engage with the two positioning pins 62. When the coaxial adjusting sleeve 7 is fitted over the push-pull sleeve 6, the two positioning grooves 70 cooperate with the two positioning pins 62 to achieve the positioning of the coaxial adjusting sleeve 7. At this time, the extension lines of the measuring rods of the first dial indicator 71 and the second dial indicator 72 both pass through the center of the radial plane of the valve stem 1001 and are perpendicular to each other.

[0081] After alignment, the push-pull sleeve 6 is moved by the push-pull force drive 22, the coaxial adjusting sleeve 7 is removed, and the valve stem sleeve 5 and the push-pull sleeve 6 are connected by the connecting sleeve 4. After the connection is completed, the push-pull force drive 22 is started by the control module. The push-pull force drive 22 drives the push-pull sleeve 6 to move, applying a push or pull force to the valve stem 1001. At this time, the force detected by the force sensor 23 is the frictional force between the valve stem 1001 and the sealing packing.

[0082] In this embodiment, the test cabinet 20 is also equipped with a display screen and an operating console. The display screen and operating console are electrically connected to the control module. The operating console is used by the operator to input test parameters, such as push-pull driving force, etc., and the display screen is used to display test results and test parameters, etc. The control module includes a controller, which can be a centralized or distributed controller. For example, the controller can be a single microcontroller or a combination of multiple distributed microcontrollers. The microcontroller can run a control program to control the push-pull driving component 22, the Y-axis driving source 2121, the Z-axis driving source, the yaw driving source 15, the pitch driving source 13, etc., to achieve their functions.

[0083] The dual-valve friction force testing device provided in this embodiment is applicable to different test valves 100. It can simultaneously adjust the installation height, pitch angle, and yaw angle of the valve 100 to accommodate a 3° deviation of the mounting base relative to the horizontal plane. Furthermore, the coaxiality of the driving direction of the valve stem 1001 and the push-pull force drive component 22 is high after adjustment, resulting in high accuracy of the test results. At the same time, it has good structural integrity and compactness, adopting a modular structure design of control module, valve fixing mechanism 1, push-pull force mechanism 2, and centering mechanism 3. It is simple to operate, easy to maintain, and easy to replace parts, ensuring the reliability of the dual-valve friction force testing device.

[0084] 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 the present invention is determined by the scope of the appended claims.

Claims

1. A dual-valve friction force testing device, characterized in that, include: A valve fixing mechanism includes a fixing seat, on which the valve under test is movably mounted. The valve under test has a valve stem, and the valve stem is adjustable relative to the fixing seat with respect to the Y and Z directions as axes, respectively. A push-pull force mechanism is arranged opposite to the valve fixing mechanism along the X direction. The push-pull force mechanism includes an adjustment component and a push-pull force drive component. The push-pull force drive component is adjustablely arranged on the adjustment component in the Y and Z directions. The drive end of the push-pull force drive component can move along the X direction. The drive end of the push-pull force drive component is detachably coaxially connected to one end of the valve stem through a force sensor.

2. The dual-valve friction force testing device according to claim 1, characterized in that, The valve fixing mechanism also includes: The pitch frame is rotatably mounted on the fixed base about the Y direction, and the valve under test is rotatably mounted on the pitch frame about its axis. A pitch drive source is mounted on the fixed base and drives the pitch frame. The pitch drive source can drive the pitch frame to rotate around the Y direction.

3. The dual-valve friction force testing device according to claim 2, characterized in that, The valve fixing mechanism also includes: A locking element is provided on the fixed base and can be connected to or released from the pitch frame to limit the rotation of the pitch frame relative to the fixed base, or to release the pitch frame to allow the pitch frame to rotate relative to the fixed base.

4. The dual-valve friction force testing device according to claim 2, characterized in that, The valve fixing mechanism further includes a yaw drive source and a yaw rotary table. The yaw rotary table is rotatably mounted on the pitch frame. The valve under test is detachably mounted on the yaw rotary table. The yaw drive source drives and connects to the yaw rotary table, and can drive the yaw rotary table to rotate around its own axis. The axis of the yaw rotary table is perpendicular to the Y direction.

5. The dual-valve friction force testing device according to any one of claims 1-4, characterized in that, Also includes: The centering mechanism includes a sensor sleeve and an angle sensor mounted on the sensor sleeve. The two ends of the sensor sleeve are detachably coaxially sleeved on the drive end of the push-pull force drive and one end of the valve stem.

6. The dual-valve friction force testing device according to any one of claims 1-4, characterized in that, It also includes a connecting sleeve, the two ends of which can be detachably connected to the driving end of the push-pull force driving component and one end of the valve stem, respectively.

7. The dual-valve friction force testing device according to claim 6, characterized in that, It also includes a valve stem sleeve and a push-pull sleeve. One end of the valve stem sleeve is threaded to one end of the valve stem, and the other end is provided with a first external thread rod. One end of the push-pull sleeve is connected to the drive end of the push-pull force drive through the force sensor, and the other end is provided with a second external thread rod. Both ends of the connecting sleeve can be threaded to the first external thread rod and the second external thread rod at the same time.

8. The dual-valve friction force testing device according to claim 7, characterized in that, Also includes: A coaxial adjusting sleeve is detachably fitted at both ends to the valve stem sleeve and the push-pull sleeve, respectively. A first dial indicator and a second dial indicator are provided on the coaxial adjusting sleeve. The measuring rods of the first dial indicator and the second dial indicator are vertically arranged and can respectively abut against the outer periphery of the valve stem sleeve located inside the coaxial adjusting sleeve.

9. The dual-valve friction force testing device according to any one of claims 1-4, characterized in that, The positioning component further includes: The Z-axis lifting structure includes a support frame, a movable frame, and a Z-axis drive source. The movable frame is slidably connected to the support frame along the Z-direction, and the Z-axis drive source is connected to the movable frame and can drive the movable frame to slide along the Z-direction. The Y-axis moving structure includes a Y-axis drive source and a Y-axis moving plate. The Y-axis moving plate is slidably mounted on the moving frame. The push-pull force driving component is mounted on the Y-axis moving plate. The Y-axis drive source is mounted on the moving frame and drives the Y-axis moving plate, enabling the Y-axis moving plate to slide along the Y direction.

10. The dual-valve friction force testing device according to any one of claims 1-4, characterized in that, It also includes a test bench, which is covered with a protective cover. The valve fixing mechanism and the push-pull mechanism are both set on the test bench and located inside the protective cover.

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