Double-valve friction force testing device

Abstract

The invention 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] The invention relates to the technical field of double-valve friction force testing equipment, and in particular to a double-valve friction force testing device. Background Art

[0002] Double valve is a valve structure, which is composed 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 part, and directly drives the valve core to move or rotate on the lower part 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 between the valve stem and the valve body sealing packing of the valve. In the prior art, the friction force of the axial reciprocating linear motion of the valve stem and the valve body sealing packing is measured by connecting the valve stem with a driving source fixed on a workbench and applying a pulling force to the valve stem. The positions of the driving source and the test valve are relatively fixed, which makes it difficult for the test equipment to be applied to different test valves. The flexibility of use is poor, and 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 device is urgently needed to solve the above problems. Summary of the invention

[0004] Based on the above, the object of the present invention is to provide a dual-valve friction force testing device, which is suitable for different test valves and has high test accuracy.

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

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

[0007] The valve fixing mechanism comprises a fixing seat, on which the tested valve is movably arranged, and the tested valve has a valve stem, and the valve stem is adjustable relative to the fixing seat with the Y direction and the Z direction as axis angles;

[0008] A push-pull force mechanism is arranged opposite to the valve fixing mechanism along the X direction, and the push-pull force mechanism includes a position adjustment component and a push-pull force driving member. The push-pull force driving member is arranged on the position adjustment component so that its position can be adjusted in the Y direction and the Z direction. The driving end of the push-pull force driving member can move along the X direction, and the driving end of the push-pull force driving member is detachably coaxially connected to one end of the valve stem through a force sensor.

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

[0010] A pitch frame is rotatably mounted on the fixing seat around the Y direction, and the test valve is rotatably mounted on the pitch frame around its axis;

[0011] The pitch driving source is arranged on the fixing seat and is drivingly connected to the pitch frame. The pitch driving source can drive the pitch frame to rotate around the Y direction.

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

[0013] A locking member is arranged on the fixing seat and can be connected with the pitch frame in a limiting manner or release the pitch frame to limit the pitch frame from rotating relative to the fixing seat, or release the pitch frame to allow the pitch frame to rotate relative to the fixing seat.

[0014] As a preferred solution for a dual-valve friction force testing device, the valve fixing mechanism also includes a yaw drive source and a yaw rotation table. The yaw rotation table is rotatably mounted on the pitch frame, and the test valve is detachably mounted on the yaw rotation table. The yaw drive source is driven and connected to the yaw rotation table, and can drive the yaw rotation table to rotate around its own axis, and the axis of the yaw rotation table is perpendicular to the Y direction.

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

[0016] The centering mechanism comprises a sensor sleeve and an inclination sensor arranged on the sensor sleeve. The two ends of the sensor sleeve are detachably coaxially sleeved on the driving end of the push-pull force driving member and one end of the valve stem.

[0017] As a preferred solution of a dual-valve friction force testing device, it also includes a connecting sleeve, and both ends of the connecting sleeve can be detachably connected to the driving end of the push-pull force driving component and one end of the valve stem respectively at the same time.

[0018] As a preferred solution of a dual-valve friction force testing device, it also includes a valve stem sleeve and a push-pull force sleeve, one end of the valve stem sleeve is threadedly connected to one end of the valve stem, and the other end is provided with a first externally threaded 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 externally threaded rod, and the two ends of the connecting sleeve can be threadedly connected to the first externally threaded rod and the second externally threaded rod respectively at the same time.

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

[0020] The coaxial adjustment sleeve has two ends which are detachably mounted on the valve stem sleeve and the push-pull force sleeve respectively. The coaxial adjustment sleeve is provided with a first dial indicator and a second dial indicator. The measuring rod of the first dial indicator and the measuring rod of the second dial indicator are vertically arranged and can respectively contact the outer periphery of the valve stem sleeve located in the coaxial adjustment sleeve.

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

[0022] The Z-direction lifting structure comprises a support frame, a mobile frame and a Z-direction driving source, wherein the mobile frame is connected to the support frame in a sliding manner along the Z direction, and the Z-direction driving source is connected to the mobile frame in a driving manner and can drive the mobile frame to slide along the Z direction;

[0023] The Y-direction moving structure includes a Y-direction driving source and a Y-direction moving plate. The Y-direction moving plate is slidably arranged on the moving frame, the push-pull driving member is arranged on the Y-direction moving plate, the Y-direction driving source is arranged on the moving frame and is drivingly connected to the Y-direction moving plate, and can drive the Y-direction moving plate to slide along the Y direction.

[0024] As a preferred solution of a dual-valve friction force testing device, it also includes a test bench, the test bench is covered with a protective outer cover, the valve fixing mechanism and the push-pull force mechanism are both arranged on the test bench and located inside the protective outer cover.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides a double valve friction test device, which includes a valve fixing mechanism and a push-pull mechanism. When a pull test is required, the tested valve is installed on a fixed seat, and the push-pull driving source is adjusted in the Y direction and the Z direction so that the push-pull driving source can be close to or away from the tested valve, which is convenient for docking the driving end of the push-pull driving member and the valve stem, and at the same time, the valve stem on the valve is adjusted with the Y direction and the Z direction as the axis. The valve stem can be adjusted to be coaxial with the driving direction of the push-pull driving member, thereby improving the docking accuracy and the friction test accuracy; by driving the push-pull rod to move along the X direction, a pulling force is applied to the valve stem, and the valve stem and the valve body sealing packing of the tested valve generate friction, and the thrust or pulling force detected by the force sensor at this time is the friction between the valve stem and the sealing packing. The double valve friction test device can be applied to different tested valves by setting the valve stem to have an adjustable angle relative to the fixed seat and an adjustable position of the push-pull driving member, which is convenient for docking different tested valves with the push-pull driving member, has better flexibility in use, and has higher test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 is a side view of a dual-valve friction force testing device provided by an embodiment of the present invention;

[0029] Figure 2 It is a structural side view of a valve stem provided by an embodiment of the present invention after docking with a push-pull force driving member;

[0030] Figure 3 is a partial structural schematic diagram of a dual-valve friction force testing device at a viewing angle provided by an embodiment of the present invention;

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

[0032] Figure 5 is a partial structural top view of a dual-valve friction force testing device provided by an embodiment of the present invention;

[0033] Figure 6 is a partial structural side view of a dual-valve friction force testing device provided by an embodiment of the present invention;

[0034] Figure 7is a partial structural schematic diagram of a valve fixing mechanism provided by an embodiment of the present invention;

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

[0036] Fig. 9 is a schematic structural diagram of a connecting sleeve provided by an embodiment of the present invention;

[0037] Fig.10 The structure of the coaxial adjustment sleeve provided by the embodiment of the present invention is shown in FIG. Figure 1 ;

[0038] Fig.11 The structure of the coaxial adjustment sleeve provided by the embodiment of the present invention is shown in FIG. Figure 2 ;

[0039] Fig.12 is a side view of a coaxial adjustment sleeve provided by an embodiment of the present invention;

[0040] Fig.13 is a schematic structural diagram of a zeroing fixture provided by an embodiment of the present invention;

[0041] Fig.14 is a schematic structural diagram of a push-pull sleeve provided by an embodiment of the present invention;

[0042] Fig.15 is a side view of a push-pull sleeve provided by an embodiment of the present invention;

[0043] Fig.16 The structure of the valve stem sleeve provided by the embodiment of the present invention is shown in FIG. Figure 1 ;

[0044] Fig.17 The structure of the valve stem sleeve provided by the embodiment of the present invention is shown in FIG. Figure 2 ;

[0045] Fig.18 is a side view of a valve stem sleeve provided by an embodiment of the present invention;

[0046] Fig.19 The structure of the sensor sleeve provided by the embodiment of the present invention is schematically shown in FIG. Figure 1 ;

[0047] Fig. 20 The structure of the sensor sleeve provided by the embodiment of the present invention is schematically shown in FIG. Figure 2 ;

[0048] Fig.21 is a side view of a sensor sleeve provided by an embodiment of the present invention;

[0049] Fig. 22is a cross-sectional view of a sensor sleeve provided by an embodiment of the present invention being sleeved on a push-pull sleeve;

[0050] Fig.23 is a cross-sectional view of a sensor sleeve provided by an embodiment of the present invention being sleeved on a valve stem sleeve;

[0051] Fig.24 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;

[0052] Fig.25 It is a cross-sectional view of a coaxial adjustment sleeve provided by an embodiment of the present invention being sleeved on a zeroing jig.

[0053] In the figure:

[0054] 1. Valve fixing mechanism; 11. Fixed seat; 12. Pitch frame; 13. Pitch drive source; 14. Locking piece; 141. Locking pin; 142. Limiting head; 143. Offset fork; 15. Yaw drive source; 16. Yaw rotating table; 2. Push-pull force mechanism; 21. Position adjustment component; 211. Z-direction lifting structure; 2111. Support frame; 2112. Moving frame; 212. Y-direction moving structure; 2121. Y-direction drive source; 2122. Y-direction moving plate; 22. Push-pull force driving piece; 23. Force sensor; 3. Centering mechanism; 31. Sensor sleeve ; 32. Inclination sensor; 4. Connecting sleeve; 5. Valve stem sleeve; 51. First external threaded rod; 6. Push-pull sleeve; 61. Second external threaded rod; 62. Positioning column; 7. Coaxial adjustment 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 roller; 102. Support foot; 20. Test cabinet; 201. Test bench; 202. Protective cover; 100. Valve; 1001. Valve stem; 1002. Flange. DETAILED DESCRIPTION

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] like Figures 1 to 25As shown, this embodiment provides a double valve friction test device, which is used to measure the friction of the axial reciprocating linear motion of the valve stem 1001 of the valve 100 and the valve body sealing packing. By applying a push-pull force to the valve 100, the force sensor 23 is used to detect the magnitude of the applied push-pull force, that is, the measurement of the friction is achieved. Specifically, the double valve friction test device includes a cabinet 10 and a test cabinet 20. The cabinet 10 is provided with a power supply and a control module. The test cabinet 20 is located on the cabinet 10. A test mechanism is provided in the test cabinet 20. The test mechanism is connected to the control module. The test mechanism is used to test the friction of the valve stem 1001 and the sealing packing on the valve 100. The start and stop of the test mechanism and the test parameters are controlled by the control module. The overall double valve friction test device is easy to move and use. Preferably, a plurality of universal rollers 101 are provided at the bottom of the cabinet 10. The universal rollers 101 are used to facilitate the movement of the double valve friction test device, saving manpower. More preferably, a plurality of legs 102 are provided at the bottom of the cabinet 10, and the universal roller 101 is telescopically arranged. By telescoping the universal roller 101, the universal roller 101 can support the ground or the legs 102 can support the ground to meet the requirements of stable parking and movement. The universal roller 101 can be connected to the bottom of the cabinet 10 optionally but not limited to via a telescopic rod.

[0060] In this embodiment, if Figure 1 As shown, the test cabinet 20 includes a test table 201 and a protective cover 202. The protective cover 202 is disposed on the test table 201. A test space is formed between the protective cover 202 and the test table 201. The test mechanism is located in the test space, and the test is performed in the test space. The protective cover 202 can ensure the safety of the test and reduce the impact of the test noise on the external environment.

[0061] Specifically, the test bench 201 is provided with a valve fixing mechanism 1 and a push-pull mechanism 2 which are arranged relatively along the X direction. Both the valve fixing mechanism 1 and the push-pull mechanism 2 are located in the test space. The valve fixing mechanism 1 includes a fixing seat 11. The test valve 100 is movably arranged on the fixing seat 11. The test valve 100 has a valve stem 1001. The valve stem 1001 is adjustable relative to the fixing seat 11 in the Y direction and the Z direction. The push-pull mechanism 2 is arranged relatively to the valve fixing mechanism 1 along the X direction. The push-pull mechanism 2 includes a position adjustment component and a push-pull force driving member 22. The push-pull force driving member 22 is adjustable in position in the Y direction and the Z direction on the position adjustment component 21. The push-pull force driving member 22 is connected to a control module, and the control module can control the start and stop, driving direction and driving force of the push-pull force driving member 22. The driving end of the push-pull force driving member 22 is detachably coaxially connected to one end of the valve stem 1001 through a force sensor 23. The X direction is the length direction of the push-pull force rod. When a push-pull force test is required, the tested valve 100 is installed on the fixed seat 11. By adjusting the position of the push-pull force driving member 22 in the Y direction and the Z direction, the push-pull force driving member 22 can be close to or away from the tested valve 100, which is convenient for docking the driving end of the push-pull force driving member 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 direction and the Z direction as the axis, the valve stem 1001 can be adjusted to be coaxial with the driving direction of the push-pull force driving member 22, thereby improving the docking accuracy and the friction force test accuracy. By driving the driving end of the push-pull force member to move along the X direction, a pulling force or a pushing force is applied to the valve stem 1001, and the valve stem 1001 and the valve body sealing packing of the tested valve 100 generate friction. At this time, the pulling force or the pushing force detected by the force sensor 23 is the friction between the valve stem 1001 and the sealing packing. The dual-valve friction force testing device has a flexible adjustment function, which allows the installation surface of the valve to have an adaptive deviation of, for example, 3° relative to the horizontal plane. By setting the valve stem 1001 to have an adjustable angle relative to the fixed seat 11 and the position of the push-pull force driving component 22 to be adjustable, it can be suitable for different test valves 100, and facilitates the docking of different test valves 100 with the push-pull force driving component 22. It has better flexibility in use and higher test accuracy.

[0062] In this embodiment, if Figure 2 and Fig. 9 As shown, the valve stem 1001 and the driving end of the push-pull force driving member 22 are connected via a connecting sleeve 4, and the two ends of the connecting sleeve 4 are detachably connected to the valve stem 1001 and the driving end of the push-pull force driving member 22, respectively. After adjusting the positions of the valve stem 1001 and the driving end of the push-pull force driving member 22, the connection between the valve stem 1001 and the driving end of the push-pull force driving member 22 is achieved by moving the driving end of the push-pull force driving member 22 while connecting the connecting sleeve 4, and then the driving end of the push-pull force driving member 22 moves to start testing.

[0063] Specifically, the push-pull force driving member 22 is a servo electric cylinder, which can realize precise speed control, precise position control and precise push-pull force control. The free end of the driving rod of the servo electric cylinder is coaxially connected to the push-pull force sleeve 6 through the force sensor 23, and the end of the push-pull force sleeve 6 facing away from the servo electric cylinder is detachably coaxially connected to one end of the valve stem 1001; or the servo electric cylinder is provided with a force sensor 23, and the free end of the driving rod of the servo electric cylinder is coaxially connected to the push-pull force sleeve 6, and the end of the push-pull force sleeve 6 facing away from 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, and the displacement sensor is used to detect the displacement of the driving end of the push-pull force driving member 22 relative to the valve stem 1001 in the X direction. During the test, the measured displacement is the displacement of the valve stem 1001 relative to the sealing packing, and the displacement is proportional to the measured force, which is convenient for further analysis of the subsequent friction test. 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 double-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, and the first internal thread and the first external thread cooperate to realize the detachable connection between the valve stem 1001 and the valve stem sleeve 5; the other end of the valve stem sleeve 5 is convexly provided with a first external threaded rod 51, and the end of the push-pull force sleeve 6 facing away from the servo electric cylinder is convexly provided with a second external threaded rod 61, and the two ends of the connecting sleeve 4 are respectively provided with second internal threads, and the connection between the connecting sleeve 4 and the valve stem sleeve 5 and the push-pull force sleeve 6 is realized by threaded connection of the two second internal threads with the first external threaded rod 51 and the second external threaded rod 61 respectively. While the push-pull force driving member 22 drives the push-pull force sleeve 6 to approach the valve stem sleeve 5, the connecting sleeve 4 is rotated, and one end of the connecting sleeve 4 is connected to the first external threaded rod 51 through the second internal thread. At the same time, the other end of the connecting sleeve 4 is connected to the second external threaded rod 61 through the second internal thread. The connection stability and structural strength are better, and it is easy to assemble and disassemble.

[0065] Furthermore, if 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 installed on the fixing seat 11 to rotate around the Y direction. The test valve 100 is installed on the pitch frame 12 to rotate around its axis. The pitch drive source 13 is installed on the fixing seat 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 test valve 100 is installed on the pitch frame 12, the straight line where the valve stem 1001 is located may not be parallel to the straight line where the push-pull sleeve 6 is located, that is, the valve stem 1001 needs to be adjusted to the straight line where it is located parallel to the straight line where the push-pull sleeve 6 is located, and then the position of the push-pull drive member 22 is adjusted so that the push-pull sleeve 6 can be coaxial with the valve stem 1001 to achieve subsequent precise docking. The pitch frame 12 is driven to rotate by the pitch drive source 13, so that the tested valve 100 rotates around the Y direction, that is, the valve stem 1001 is pitched relative to the table surface of the test bench 201; then the tested valve 100 is rotated 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 force sleeve 6 is located, so as to improve the coaxiality of the subsequent docking between the valve stem 1001 and the push-pull force driving component 22, thereby improving the accuracy of the friction test.

[0066] Exemplarily, the pitch drive source 13 includes a driving stepper motor and a worm gear reducer, the fixed seat 11 includes a fixed base plate and two opposite support plates vertically arranged on the fixed base plate, the pitch frame 12 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 12 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 12 of plus or minus 3°, and the reverse self-locking worm gear reducer can achieve reverse self-locking at any position.

[0067] Preferably, the valve fixing mechanism 1 further comprises a lock 14, which is arranged on the fixing seat 11 and can be connected with the pitch frame 12 in a limited position or release the pitch frame 12, so as to limit the rotation of the pitch frame 12 relative to the fixing seat 11, or release the pitch frame 12 so that the pitch frame 12 can rotate relative to the fixing seat 11. When the pitch frame 12 is rotated into place, the pitch frame 12 and the fixing seat 11 are further fixed by the lock 14, so as to increase the rigidity of the pitch frame 12 during the test. More preferably, a plurality of locks 14 are provided, and the plurality of locks 14 can be connected to one or two support plates at intervals.

[0068] Exemplarily, the lock 14 includes a lock pin 141 and an offset fork 143, the offset fork 143 is rotatably connected to one end of the lock pin 141, and a limit head 142 is provided at the other end of the lock pin 141, a first limit hole is provided on the support plate, and a second limit hole is provided on the pitch frame 12, the lock pin 141 is movably inserted through the first limit hole and the second limit hole, and by rotating the offset fork 143, the lock pin 141 can be driven to move to the side of the lock head abutting against or away from the pitch frame 12 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.

[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 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 12. At this time, the locking pin 141 moves in the direction away from the pitch frame 12 until the limit 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 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 12, and at this time, the locking pin 141 moves in the direction away from the support plate until the limit head 142 moves away from the side of the pitch frame 12 away from the support plate, thereby achieving the release of the pitch frame 12 and the fixed seat 11. Of course, in other embodiments, the locking member 14 may also be other structures. For example, the locking member 14 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 12, thereby achieving the fixation or release of the pitch frame 12 and the fixing seat 11.

[0070] Specifically, the valve fixing mechanism 1 also includes a yaw drive source 15 and a yaw rotating platform 16, the yaw rotating platform 16 is rotatably mounted on the pitch frame 12, the yaw drive source 15 is connected to the control module, the control module can control the start and stop of the yaw drive source 15, the yaw drive source 15 drives the yaw rotating platform 16, and can drive the yaw rotating platform 16 to rotate around its own axis, and the axis of the yaw rotating platform 16 is perpendicular to the Y direction; the test valve 100 can be detachably mounted on the yaw rotating platform 16, for example, the mounting flange 1002 of the valve 100 is fixed on the yaw rotating platform 16 by a plurality of fastening bolts, wherein the fastening bolts are exemplarily 6 or 7, etc., which are specifically set according to actual needs. The yaw rotating platform 16 is driven to rotate by the yaw drive source 15, thereby driving the test valve 100 to rotate, realizing 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 push-pull sleeve 6 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 degrees), the pitch angle and yaw angle adjustment mechanism can adapt to the pitch angle and yaw angle deviation of the valve stem 1001 relative to the valve 100, thereby improving the measurement accuracy. Preferably, when the valve 100 is installed on the yaw rotating platform 16, the height adjustment of the mounting base of the valve 100 can be achieved by adding or removing the spacers between the mounting flange 1002 of the valve 100 and the yaw rotating platform 16.

[0071] Exemplarily, a yaw rotating table 16 is provided on the pitch frame 12 through a rotating shaft, the rotating shaft is connected to the pitch frame 12 through a rotating rolling bearing, and the valve 100 to be tested can be fixed on the yaw rotating table 16; the yaw driving source 15 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 16 to move back and forth. During the operation, the speed of the yaw rotating table 16 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.

[0072] In another embodiment, the valve fixing mechanism 1 further comprises a rotating frame, which is rotatably arranged on the fixing seat 11, and a pitch seat is flipped on the rotating frame, and the valve 100 is detachably mounted on the pitch seat, and the rotation of the rotating frame can drive the valve 100 to rotate with the Z direction as the rotation axis, and the flipping of the pitch seat can drive the valve 100 to rotate with the Y direction as the rotation axis, so as to adjust the yaw angle and pitch angle of the valve stem 1001. It should be noted that the valve fixing mechanism 1 only needs to satisfy the rotation of the valve 100 in two directions perpendicular to the X direction.

[0073] Furthermore, if Figures 19 to 25 As shown, the dual valve friction force testing device also includes a centering mechanism 3, which includes a sensor sleeve 31 and an inclination sensor 32 arranged 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 member 22 and one end of the valve stem 1001. Specifically, one end of the sensor sleeve 31 is coaxially adapted to be arranged outside the push-pull force sleeve 6, and the other end is coaxially adapted to be arranged outside the valve stem sleeve 5. The inclination sensor 32 is preferably a three-axis inclination sensor. Before docking the valve stem 1001 and the driving end of the push-pull force driving member 22, the sensor sleeve 31 is coaxially sleeved on the push-pull force sleeve 6, and then the inclination sensor 32 is reset to zero. At this time, the overall angle of the inclination sensor 32 is the same as the driving direction of the push-pull force driving member 22; the sensor sleeve 31 is removed, and the sensor sleeve 31 is coaxially sleeved on the valve stem sleeve 5. At this time, the inclination sensor 32 detects the inclination of the valve stem 1001, and the angle of the valve stem 1001 is adjusted to zero with the Y direction as the rotation axis, and the angle of the valve stem 1001 is adjusted to zero with the Z direction as the rotation axis, so as to achieve spatial parallelism between the valve stem 1001 and the driving direction of the push-pull force driving member 22. That is, when it is necessary to perform a friction test on any test valve 100, it is only necessary to sleeve the sensor sleeve 31 on the push-pull force sleeve 6 and the valve stem sleeve 5 in turn, so as to accurately achieve parallel adjustment of the driving directions of the valve stem 1001 and the push-pull force driving member 22. Among them, the inclination sensor 32 is connected to the control module, and the control module controls the pitch drive source 13 and the yaw drive source 15 according to the initial angle of the valve stem 1001 detected by the inclination sensor 32, so as to realize automatic adjustment of the angle of the valve stem 1001, with high adjustment accuracy and time-saving and labor-saving.

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

[0075] Preferably, the support frame 2111 adopts a bilaterally symmetrical structure, including two side webs arranged opposite to each other, and the Z-direction drive source is located between the two side webs, so that the structure is more compact and has higher structural strength. More preferably, the support frame 2111 is provided with weight-reducing holes to reduce its weight without affecting the structural strength, which is conducive to cost saving and convenient transportation.

[0076] Exemplarily, the Z-direction driving source includes a driving motor and a worm gear elevator, the driving motor drives the worm gear elevator, the worm gear elevator drives the moving frame 2112, and the driving motor drives the worm gear elevator to move, thereby driving the moving frame 2112 to move along the Z direction. Of course, in other embodiments, the Z-direction driving source can also be other, such as a driving cylinder.

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

[0078] After the push-pull sleeve 6 is driven to approach the valve stem sleeve 5 by the Y-direction moving structure 212, the Z-direction lifting structure 211 and the push-pull force driving member 22, the valve stem sleeve 5 and the push-pull force sleeve 6 are coaxially adjusted. Figures 10 to 25As shown, the double-valve friction force testing device also includes a coaxial adjustment sleeve 7, the two ends of the coaxial adjustment sleeve 7 are respectively detachably mounted on the driving end of the push-pull force driving member 22 and one end of the valve stem 1001, and are specifically sleeved on the outside of the push-pull force sleeve 6 and the outside of the valve stem sleeve 5. A first dial indicator 71 and a second dial indicator 72 are arranged on the coaxial adjustment sleeve 7. The measuring rod of the first dial indicator 71 and the measuring rod of the second dial indicator 72 are vertically arranged and can respectively contact the outer periphery of the valve stem sleeve 5 located in the coaxial adjustment sleeve 7. During coaxial adjustment, the Y-axis moving structure 212, the Z-axis lifting structure 211 and the push-pull force driving member 22 are used to ensure that the alignment error between the push-pull force sleeve 6 and the valve stem sleeve 5 is within a preset range, for example, the alignment error is within 7mm, 8mm or 9mm. Then, the coaxial adjustment sleeve 7 is sleeved on the valve stem sleeve 5 and the push-pull force sleeve 6. The push-pull force sleeve 6 is slightly adjusted through the Y-axis moving structure 212 and the Z-axis lifting structure 211, so that the coaxiality of the push-pull force sleeve 6 and the valve stem sleeve 5 is less than a preset value, for example, the coaxiality is less than 0.1mm.

[0079] In this embodiment, before adjusting the coaxiality of the push-pull force sleeve 6 and the valve stem sleeve 5, the first dial indicator 71 and the second dial indicator 72 are reset to zero. Specifically, the dual-valve friction testing device also includes a zeroing jig 8, and the zeroing jig 8 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 force sleeve 6, and the shape and size of the second section 82 are the same as the shape and size of the valve stem sleeve 5. When the first and second dial gauges 71 and 72 are in a normal state (when there is no object to be measured), the measuring rods will directly extend to the farthest point, that is, the maximum measuring range. After the coaxial adjustment sleeve 7 is put on the zeroing fixture 8, the third section 83 abuts against one end of the coaxial adjustment sleeve 7, and the first and second dial gauges 71 and 72 are reset to zero. After the coaxial adjustment sleeve 7 is removed, the measuring rods of the first and second dial gauges 71 and 72 are automatically reset. At this time, the data displayed on the first and second dial gauges 71 and 72 are negative values. Then the coaxial adjustment sleeve 7 is put on the valve stem sleeve 5. At this time, the end of the measuring rod of the first dial gauge 71 abuts against The outer peripheral wall of the valve stem sleeve 5 and / or the end of the measuring rod of the second dial gauge 72 touch the outer peripheral wall of the valve stem sleeve 5, and the measuring rod of the first dial gauge 71 and / or the measuring rod of the second dial gauge 72 are contracted by force, and the data displayed on the first dial gauge 71 and / or the second dial gauge 72 is the deviation value between the first section 81 and the valve stem sleeve 5; then the push-pull force driving member 22 is driven to make the push-pull force sleeve 6 insert into the coaxial adjustment sleeve 7, and adjust the Y-direction moving structure 212 and the Z-direction lifting structure 211 until the data displayed on the first dial gauge 71 and the second dial gauge 72 are all zeroed, indicating that the valve stem sleeve 5 and the push-pull force sleeve 6 are coaxial. Among them, the graduation value of the first dial gauge 71 and the second dial gauge 72 is 0.01mm. When the first dial gauge 71 and the second dial gauge 72 are zeroed, it can be judged that the coaxiality of the valve stem 1001 and the push-pull force sleeve 6 is less than 0.1mm.

[0080] Preferably, two 90-degree graduated positioning posts 62 are vertically arranged on the push-pull sleeve 6, and two positioning grooves 70 are provided at one end of the coaxial adjustment sleeve 7, and the two positioning grooves 70 can be respectively engaged with the two positioning posts 62. When the coaxial adjustment sleeve 7 is sleeved outside the push-pull sleeve 6, the two positioning grooves 70 are respectively matched with the two positioning posts 62 to realize the positioning of the coaxial adjustment sleeve 7. At this time, the extended lines of the measuring rods of the first dial gauge 71 and the second dial gauge 72 pass through the center of the diameter surface of the valve stem 1001 and are perpendicular to each other.

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

[0082] In this embodiment, the test cabinet 20 is also provided with a display screen and an operation table, which are electrically connected to the control module, the operation table is used for the operator to input test parameters, such as push-pull force driving force, etc., and the display screen is used to display test results and test parameters, etc. 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 chip microcomputer, or it can be composed of multiple distributed single chip microcomputers, and the control program can be run in the single chip microcomputer to control the push-pull force driving member 22, the Y-direction driving source 2121, the Z-direction driving source, the yaw driving source 15, the pitch driving source 13, etc. to realize their functions.

[0083] The double-valve friction test device provided in this embodiment can be applied to different test valves 100, and can simultaneously adjust the installation height, pitch angle and yaw angle of the valve 100 to meet the adaptive deviation of 3° of the installation base relative to the horizontal plane; and the driving direction coaxiality of the rear valve stem 1001 and the push-pull force driving member 22 is higher through adjustment, so that the test result has higher accuracy; at the same time, it has better structural integrity and compactness, and adopts a modular structural design of a control module, a valve fixing mechanism 1, a push-pull force mechanism 2 and a centering mechanism 3, which is simple to operate, easy to maintain, and easy to replace parts, thereby ensuring the reliability of the double-valve friction test device.

[0084] 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 device, characterized in that: include: The valve fixing mechanism comprises a fixing seat, on which the tested valve is movably arranged, and the tested valve has a valve stem, and the valve stem is adjustable relative to the fixing seat with the Y direction and the Z direction as axis angles; A push-pull force mechanism is arranged opposite to the valve fixing mechanism along the X direction, and the push-pull force mechanism includes a position adjustment component and a push-pull force driving member. The push-pull force driving member is arranged on the position adjustment component so that its position can be adjusted in the Y direction and the Z direction. The driving end of the push-pull force driving member can move along the X direction, and the driving end of the push-pull force driving member 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: A pitch frame is rotatably mounted on the fixing seat around the Y direction, and the test valve is rotatably mounted on the pitch frame around its axis; The pitch driving source is arranged on the fixing seat and is drivingly connected to the pitch frame. The pitch driving 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 member is arranged on the fixing seat and can be connected with the pitch frame in a limiting manner or release the pitch frame to limit the pitch frame from rotating relative to the fixing seat, or release the pitch frame to allow the pitch frame to rotate relative to the fixing seat.

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

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

6. The double valve friction force testing device according to any one of claims 1 to 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 at the same time.

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 force sleeve, one end of the valve stem sleeve is threadedly connected to one end of the valve stem, and the other end is provided with a first externally threaded 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 externally threaded rod, and the two ends of the connecting sleeve can be threadedly connected to the first externally threaded rod and the second externally threaded rod respectively at the same time.

8. The dual-valve friction force testing device according to claim 7, characterized in that: Also includes: The coaxial adjustment sleeve has two ends which are detachably mounted on the valve stem sleeve and the push-pull force sleeve respectively. The coaxial adjustment sleeve is provided with a first dial indicator and a second dial indicator. The measuring rod of the first dial indicator and the measuring rod of the second dial indicator are vertically arranged and can respectively contact the outer periphery of the valve stem sleeve located in the coaxial adjustment sleeve.

9. The double valve friction force testing device according to any one of claims 1 to 4, characterized in that: The positioning component also includes: The Z-direction lifting structure comprises a support frame, a mobile frame and a Z-direction driving source, wherein the mobile frame is connected to the support frame in a sliding manner along the Z direction, and the Z-direction driving source is connected to the mobile frame in a driving manner and can drive the mobile frame to slide along the Z direction; The Y-direction moving structure includes a Y-direction driving source and a Y-direction moving plate. The Y-direction moving plate is slidably arranged on the moving frame, the push-pull driving member is arranged on the Y-direction moving plate, the Y-direction driving source is arranged on the moving frame and is drivingly connected to the Y-direction moving plate, and can drive the Y-direction moving plate to slide along the Y direction.

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

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