Online calibration and maintenance auxiliary mechanism for boiler safety valve

Abstract

The application provides an online checking and maintenance auxiliary mechanism for a boiler safety valve, which comprises a base, a frame covered on the base, a valve body provided in the frame and located at the top of the base, and a valve rod provided at the top of the valve body; an auxiliary checking assembly is arranged in the inner cavity of the frame and located at the end of the valve rod away from the valve body; the auxiliary checking assembly comprises a lifting plate arranged at the end of the valve rod away from the valve seat, the lifting plate is in sliding connection with the inner wall of the frame, a connecting assembly for detachable fixed connection with the valve rod is arranged below the lifting plate; a tension sensor is fixed on the side of the lifting plate away from the valve seat through a connecting shaft, a pull rod is connected to the top of the tension sensor, and the top of the pull rod penetrates through the top wall of the frame; a fixing disc is sleeved on the end of the pull rod away from the tension sensor, and a moving clamping frame for pressing the fixing disc is arranged on the lifting plate. Through the clutching cooperation of the moving clamping frame and the fixing disc, the switching of two working modes of checking pulling and maintenance forced return is realized, and the online checking and maintenance operation of the safety valve is completed under the non-stop state of the boiler.

Description

Technical Field

[0001] This invention relates to the field of boiler safety valve calibration technology, and in particular to an auxiliary mechanism for online calibration and maintenance of boiler safety valves. Background Technology

[0002] Safety valves are crucial safety protection devices in boiler and pressure vessel systems. Their function is to automatically open when the internal pressure exceeds a set value, discharging some of the medium to reduce pressure and prevent overpressure explosions. To ensure the reliability of safety valves, their opening pressure and reseating performance must be calibrated periodically.

[0003] Traditional boiler safety valve calibration mostly employs an offline calibration method. This requires shutting down the boiler, removing the safety valve from its connection point, transporting it to a dedicated calibration site, and then reinstalling it after successful calibration. The biggest drawback of this method is that it leads to prolonged boiler downtime, severely disrupting production continuity. For continuously operating power plant boilers and industrial boilers, shutdown calibration not only causes significant production losses but also increases the energy and time costs of restarting the boiler. Furthermore, the disassembly, transportation, and reinstallation processes may damage the safety valve's sealing surface, affecting its subsequent operational stability.

[0004] With the development of online calibration technology, more and more enterprises are adopting online calibration to avoid losses caused by boiler shutdowns. However, current online calibration processes for boiler safety valves lack dedicated auxiliary mechanisms, especially in the fixing and positioning of safety valves, which have significant deficiencies. Existing fixing methods often use temporary bracket splicing and bolt tightening, which are complex, require multiple operators to work together, are time-consuming, and have poor stability. During calibration, problems such as loosening and displacement of the mechanism can easily occur, affecting the accuracy of the calibration data and potentially causing unexpected displacement of the safety valve due to insecure fixing, leading to safety hazards such as high-pressure media leakage. Therefore, there is an urgent need for an auxiliary mechanism that can stably fix and reliably calibrate safety valves without shutting down the boiler. Summary of the Invention

[0005] The present invention aims to at least partially solve one of the technical problems in the related art.

[0006] To achieve the above objectives, the present invention proposes an online calibration and maintenance auxiliary mechanism for boiler safety valves, comprising a base, a frame covering the base, a valve body disposed within the frame at the top of the base, a valve seat disposed at the top of the valve body, and a valve stem disposed within the inner cavity of the valve seat; and a calibration auxiliary component disposed within the inner cavity of the frame at the end of the valve stem furthest from the valve body.

[0007] The verification auxiliary component includes a lifting plate disposed at the end of the valve stem away from the valve seat. The lifting plate is slidably connected to the inner wall of the frame, and a connecting component for detachably and fixedly connecting to the valve stem is disposed below the lifting plate. A tension sensor is fixed to the side of the lifting plate away from the valve seat via a connecting shaft. A pull rod is connected to the top of the tension sensor. The top of the pull rod passes through the top wall of the frame and is used to connect to and verify an external driving component. A fixed plate is fitted onto the end of the pull rod facing the tension sensor. A movable bracket for pressing the fixed plate is provided on the lifting plate. The movable bracket is slidably connected to the lifting plate, and the top of the movable bracket is slidably connected to the top wall of the fixed plate. A positioning screw for adjusting the position of the movable bracket is provided on the lifting plate.

[0008] This invention achieves detachable double-sided clamping and positioning of the valve stem top through a connecting component, enabling stable transmission of calibration force along the valve stem axis. Through the clutch engagement of the movable clamp and the fixed plate, two working modes—calibration lifting and maintenance forced return—are achieved within the same mechanism. During lifting, the force sensor is independently stressed to ensure measurement accuracy; during pressing, the force sensor is bypassed to prevent damage from reverse pressure. The entire mechanism can be directly installed on the boiler body without disassembling the safety valve, enabling online calibration and jamming maintenance without shutting down the boiler.

[0009] Optionally, side plates are fixedly connected to both sides of the inner cavity of the frame, and limiting grooves that slide and connect with the side plates are provided on both sides of the lifting plate.

[0010] Furthermore, a hollow pressure plate is fixedly connected to the bottom of the frame, the bottom edge of the hollow pressure plate contacts the top of the base, and a mounting plate is fixedly connected to the side of the surface of the hollow pressure plate, with mounting holes provided on the surface of the mounting plate.

[0011] Furthermore, a placement frame is provided on the right side of the frame, and a clamping screw is threadedly connected to the right side of the placement frame. A clamping plate is movably connected to one end of the clamping screw. Protective pads are fixedly connected to both the clamping plate and the inner wall surface of the frame, and the surface of the protective pads is provided with anti-slip texture.

[0012] Furthermore, a tripod is provided on the outer side of the frame below the placement frame, and the tripod is detachably and fixedly connected to the placement frame.

[0013] Furthermore, the clamping plate is vertically provided with a limiting rod facing away from the frame, and the limiting rod passes through the side wall of the placement frame and is slidably connected to the placement frame.

[0014] Furthermore, the connecting assembly includes a fixed plate and a movable plate disposed on the side of the lifting plate facing the valve stem, and the valve stem is disposed between the fixed plate and the movable plate; The lifting plate has a sliding groove on one side facing the valve stem, corresponding to the position of the moving plate. The sliding direction of the sliding groove is perpendicular to the side of the fixed plate facing the moving plate. A slider is provided in the sliding groove, and the slider is fixedly connected to the top wall of the moving plate. The bottom of the movable plate facing the fixed plate is provided with a plug rod, and the bottom of the fixed plate facing the movable plate is provided with a slot. The plug rod and the slot can be inserted into each other, and the valve stem is provided with a plug hole to cooperate with the plug rod.

[0015] Furthermore, a sliding plate is provided on the side of the movable plate opposite to the fixed plate and near the slider. The sliding plate is parallel to the lifting plate. A fastening knob is threaded through the bottom of the sliding plate. A threaded hole is provided on the side of the lifting plate facing the sliding plate to cooperate with the fastening knob. When the fastening knob is threaded into the threaded hole, the insert rod is in the insertion state with the slot.

[0016] Furthermore, a drive component mounting base for installing and verifying external drive components is fixedly connected to the top of the frame, and the surface of the drive component mounting base is provided with mounting holes.

[0017] Furthermore, the movable card holder includes two symmetrically arranged F-shaped frames. Each F-shaped frame includes a main body rod perpendicular to the lifting plate. The main body rod is provided with two clamping plates on the side facing away from the lifting plate and towards the fixed plate. The two clamping plates are arranged in parallel, and the two clamping plates are respectively abutted against the top and bottom of the fixed plate. The lifting plate is provided with an adjustment seat parallel to the main body rod, the positioning screw passes through the main body rod and is rotatably connected to the adjustment seat, and the main body rod is threadedly connected to the positioning screw; The mobile card holder has a verification working status and a maintenance working status: During the verification process, the movable card holder is completely detached from the fixed plate, allowing the external lifting force to be transmitted to the valve stem via the tension sensor. In the maintenance state, the movable bracket supports the upper and lower surfaces of the fixed plate, so that the external downward pressure is transmitted to the lifting plate through the positioning screw, and the tension sensor does not bear the reverse pressure.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a perspective view of the overall structure of an embodiment of the present invention; Figure 2 This is a bottom view diagram of an embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of point A in the middle; Figure 4 This is a schematic diagram of the internal structure of the frame in an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of a portion of point B in the middle; Figure 6 This is a cross-sectional view of the bottom of the lifting plate in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the placement frame, clamping screw, and clamping plate in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Base; 2. Valve body; 3. Valve stem; 4. Frame; 5. Calibration auxiliary components; 501. Lifting plate; 502. Fixing plate; 503. Slot; 504. Slide groove; 505. Slider; 506. Moving plate; 507. Insert rod; 508. Tension sensor; 509. Pull rod; 6. Positioning screw; 7. Moving bracket; 8. Fixing plate; 9. Hollow pressure plate; 10. Placement frame; 11. Clamping screw; 12. Clamping plate; 13. Slide plate; 14. Fastening knob. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] This invention proposes an auxiliary mechanism for online calibration and maintenance of boiler safety valves, as described below. Figures 1 to 7 Please provide a detailed explanation.

[0023] An online calibration and maintenance auxiliary mechanism for boiler safety valves includes a base 1, a frame 4 covering the base 1, a valve body 2 located at the top of the base 1 inside the frame 4, a valve seat located at the top of the valve body 2, and a valve stem 3 located inside the valve seat; a calibration auxiliary component 5 is located at the end of the valve stem 3 away from the valve body 2 inside the frame 4. The verification auxiliary component 5 includes a lifting plate 501 disposed at the end of the valve stem 3 away from the valve seat. The lifting plate 501 is slidably connected to the inner wall of the frame 4, and a connecting component for detachably and fixedly connected to the valve stem 3 is disposed below the lifting plate 501. A tension sensor 508 is fixed to the side of the lifting plate 501 away from the valve seat via a connecting shaft. A pull rod 509 is connected to the top of the tension sensor 508. The top of the pull rod 509 passes through the top wall of the frame 4 and is used to connect and verify the external driving component. A fixed plate 8 is fitted onto one end of the pull rod 509 facing the tension sensor 508. A movable bracket 7 for pressing the fixed plate 8 is provided on the lifting plate 501. The movable bracket 7 is slidably connected to the lifting plate 501, and the top of the movable bracket 7 is slidably connected to the top wall of the fixed plate 8. A positioning screw 6 for adjusting the position of the movable bracket 7 is provided on the lifting plate 501.

[0024] This invention achieves detachable double-sided clamping and positioning of the top of the valve stem 3 through a connecting component, enabling stable transmission of the calibration force along the axial direction of the valve stem 3. Through the engagement and disengagement of the movable clamp 7 and the fixed plate 8, two working modes—calibration lifting and maintenance forced return—are achieved within the same mechanism. During lifting, the force sensor 508 is independently stressed to ensure measurement accuracy; during pressing, the force sensor 508 is bypassed to prevent damage from reverse pressure. The entire mechanism can be directly installed on the boiler body without disassembling the safety valve, enabling online calibration and jamming maintenance without shutting down the boiler.

[0025] In some embodiments, side plates are fixedly connected to both sides of the inner cavity of the frame 4, and limiting grooves that slide and connect with the side plates are provided on both sides of the lifting plate 501. The side plates and the limiting grooves form a sliding guide pair in the vertical direction. The outer surface of the side plate and the inner surface of the limiting groove are fitted with a clearance, so that the lifting plate 501 can only slide smoothly up and down in the vertical direction defined by the side plate, while its forward and backward translation, left and right translation and rotation around the vertical axis in the horizontal plane are all effectively constrained. The setting of this guide structure ensures that the connecting components connected to the lifting plate 501 always maintain precise alignment with the valve stem 3 during the calibration process, and the valve stem 3 will not be subjected to eccentric torque due to lateral swaying of the lifting plate 501. This avoids problems such as bending deformation of the valve stem 3, one-sided wear of the sealing surface or deviation of the calibration force direction, and ensures that the value read by the tension sensor 508 truly reflects the axial force on the valve stem 3, thereby improving the accuracy and repeatability of the calibration data.

[0026] In some embodiments, a hollow pressure plate 9 is fixedly connected to the bottom of the frame 4. The edge of the bottom of the hollow pressure plate 9 contacts the top of the base 1. A mounting plate is fixedly connected to the side of the surface of the hollow pressure plate 9, and mounting holes are provided on the surface of the mounting plate. The hollow pressure plate 9 adopts a hollow design in the middle, which effectively reduces the overall weight of the frame 4 and makes it easier for operators to move and install it in the narrow space on top of the boiler. After the mounting plate is fastened to the reserved holes in the boiler body through the mounting holes with bolts, a stable surface contact bearing relationship is formed between the bottom surface of the hollow pressure plate 9 and the upper surface of the base 1. With the pre-tightening force of the fasteners, the overall displacement freedom of the frame 4 in the horizontal and vertical directions is effectively constrained, ensuring that the entire mechanism will not shift or overturn due to reaction force during the verification lifting or maintenance pressing process, and providing a stable reference support platform for the verification auxiliary component 5.

[0027] In some embodiments, a placement frame 10 is provided on the right side of the frame 4. A clamping screw 11 is threadedly connected to the right side of the placement frame 10. A clamping plate 12 is movably connected to one end of the clamping screw 11. Protective pads are fixedly connected to both the clamping plate 12 and the inner wall surface of the frame 4. The surface of the protective pads is provided with anti-slip textures. The placement frame 10 provides dedicated storage space for various tools and maintenance instruments used during the calibration process, preventing items from slipping or being lost when operators frequently take tools from the top of the boiler. Rotating the clamping screw 11 can push the clamping plate 12 to move towards the side wall of the frame 4, clamping and fixing the tools placed in the frame. The protective pads are made of elastic materials such as rubber, which increases the coefficient of friction with the tool surface. Combined with the anti-slip texture design, this effectively prevents tools from slipping and falling in the vibration environment of boiler operation. On the other hand, its elastic characteristics can adapt to tool shells of different shapes, avoiding scratches or deformation of precision instrument shells caused by rigid clamping, thus improving the reliability and safety of tool storage.

[0028] In some embodiments, a tripod is provided on the outer side of the frame 4 below the placement frame 10, and the tripod is detachably and fixedly connected to the placement frame 10. The tripod forms a triangular reinforcement support for the placement frame 10 from the bottom. The triangular structure has excellent mechanical stability and can effectively transfer the gravity load of the placement frame 10 and the tools inside to the side wall of the frame 4. This structure significantly improves the cantilever load-bearing stiffness and vibration resistance of the placement frame 10. Even when heavy calibration tools are placed or the boiler is operating and generating continuous vibration, the placement frame 10 will not sink, deform, or loosen, ensuring the long-term reliability of the tool storage function. At the same time, the detachable fixing method facilitates individual maintenance or replacement of the placement frame 10.

[0029] In some embodiments, a limiting rod is vertically disposed on the clamping plate 12 facing away from the frame 4. The limiting rod passes through the side wall of the placement frame 10 and is slidably connected to the placement frame 10. The limiting rod passes through the side wall of the placement frame 10 and maintains a sliding engagement with it. During the rotational advancement of the clamping screw 11, the limiting rod restricts the rotational freedom of the clamping plate 12, ensuring that the clamping plate 12 can only move and advance in a direction perpendicular to the side wall of the frame 4, always maintaining a parallel posture to the side wall of the frame 4. This design avoids the clamping plate 12 from deflecting under the threaded pushing force, preventing uneven force on the tool or clamping failure due to the tilting of the clamping plate 12, and ensuring the stability and reliability of the clamping action.

[0030] In some embodiments, the connecting assembly includes a fixed plate 502 and a movable plate 506 disposed on one side of the lifting plate 501 facing the valve stem 3, and the valve stem 3 is disposed between the fixed plate and the movable plate 506; A sliding groove 504 is provided on the side of the lifting plate 501 facing the valve stem 3, corresponding to the position of the moving plate 506. The sliding direction of the sliding groove 504 is perpendicular to the side of the fixed plate 502 facing the moving plate 506. A slider 505 is provided in the sliding groove 504, and the slider 505 is fixedly connected to the top wall of the moving plate 506. A rod 507 is provided on the bottom of the movable plate 506 facing the fixed plate 502, and a slot 503 is provided on the bottom of the fixed plate 502 facing the movable plate 506. The rod 507 and the slot 503 can be inserted into each other, and the valve stem 3 is provided with a hole to cooperate with the rod 507.

[0031] It should be noted that the operator can adjust the position of the moving plate 506 by sliding the slider 505 horizontally within the slide groove 504 according to the actual position of the insertion hole at the top of the valve stem 3, so that the insertion rod 507 is accurately aligned with the insertion hole at the top of the valve stem 3. After the insertion rod 507 passes through the insertion hole of the valve stem 3, it continues to advance forward and inserts into the slot 503 on the fixed plate 502, forming a double-sided simply supported beam clamping and positioning structure in which the insertion rod 507 passes through the valve stem 3 and is supported at both ends by the moving plate 506 and the fixed plate 502 respectively. This structure firmly fixes the top of the valve stem 3 between the two support points of the lifting plate 501, so that the valve stem 3 can remain stably centered when subjected to upward pulling force or downward pressure, preventing the valve stem 3 from tilting or falling out. Compared to traditional fixing methods such as single-sided hooks or single-point push, the double-sided clamping and positioning structure allows the insert rod 507 to bear double shear surfaces when under force, which greatly improves the load-bearing capacity. At the same time, the force point of the valve stem 3 is located in the middle of the insert rod 507, and the force transmission path is symmetrical and uniform, which effectively avoids the risk of single-sided wear of the sealing surface, distortion of calibration data, and potential media leakage caused by the misalignment of the valve stem 3.

[0032] In some embodiments, a sliding plate 13 is provided on the side of the movable plate 506 away from the fixed plate 502 and near the end of the slider 505. The sliding plate 13 is parallel to the lifting plate 501. A fastening knob 14 is threaded through the bottom of the sliding plate 13. A threaded hole is provided on the side of the lifting plate 501 facing the sliding plate 13 to cooperate with the fastening knob 14. The threaded hole is located at the end of the slide groove 504 away from the fixed plate 502. When the fastening knob 14 is threadedly connected to the threaded hole, the insertion rod 507 and the slot 503 are in a stable insertion state. That is, at this time, the distance between the fixed plate 502 and the moving plate 506 is the minimum distance.

[0033] It should be noted that after the insertion rod 507 has passed through the valve stem 3 insertion hole and is inserted into the slot 503, tighten the fastening knob 14 on the slide plate 13 so that its tip is screwed into the corresponding threaded hole at the bottom of the lifting plate 501. Through the self-locking effect of the thread and the cooperation between the knob tip and the threaded hole, the horizontal position of the moving plate 506 and the slide plate 13 relative to the lifting plate 501 is reliably locked. This locking mechanism effectively prevents the insertion rod 507 from accidentally coming out of the valve stem 3 insertion hole due to equipment vibration, the reciprocating motion of the pull rod 509, or accidental external impact during calibration or maintenance. At the same time, the cooperation state of the fastening knob 14 and the threaded hole directly corresponds to the insertion state of the insertion rod 507 and the slot 503. The operator can intuitively judge whether the insertion rod 507 has been accurately positioned by whether the fastening knob 14 can be smoothly screwed into the threaded hole, which plays a dual role of indication and confirmation, avoiding the safety hazard of the insertion rod 507 coming out under force due to incomplete insertion.

[0034] In some embodiments, a drive component mounting base for mounting and calibrating external drive components is fixedly connected to the top of the frame 4. The surface of the drive component mounting base has mounting holes. The drive component mounting base provides a standardized mounting interface for external drive devices (such as electric cylinders, hydraulic cylinders, or manual pulling devices). The mounting holes allow for quick disassembly and replacement of drive devices of different specifications, adapting to application scenarios with different calibration force requirements and improving the versatility and adaptability of the mechanism.

[0035] In some embodiments, a limiting ring is fixedly connected to the top of the frame 4, and the surface of the pull rod 509 is movably connected to the inner cavity of the limiting ring. The limiting ring provides radial constraint and axial guidance for the up-and-down movement of the pull rod 509, ensuring that the pull rod 509 always maintains a vertical movement state under the action of an external driving device. The fit clearance between the limiting ring and the pull rod 509 is designed to ensure smooth sliding of the pull rod 509 while effectively preventing the pull rod 509 from deflecting.

[0036] In some embodiments, the movable card holder 7 includes two symmetrically arranged F-shaped frames. Each F-shaped frame includes a main body rod perpendicular to the lifting plate 501. Two clamping plates are arranged on the side of the main body rod facing away from the lifting plate 501 and towards the fixed plate 8. The two clamping plates are arranged in parallel and abut against the top and bottom of the fixed plate 8, respectively. The lifting plate 501 has an adjustment seat on its parallel main rod. The positioning screw 6 passes through the main rod and is rotatably connected to the adjustment seat. The main rod is threadedly connected to the positioning screw 6. The mobile card holder 7 has both calibration and maintenance modes: During the calibration process, the movable card holder 7 is completely detached from the fixed plate 8, so that the external lifting force is transmitted to the valve stem 3 through the tension sensor 508. In the maintenance state, the movable card holder 7 supports the upper and lower surfaces of the fixed plate 8, so that the external downward pressure is transmitted to the lifting plate 501 through the positioning screw 6, and the tension sensor 508 does not bear the reverse pressure.

[0037] It should be noted that during online verification, the operator rotates the positioning screw 6 to disengage both the upper and lower clamping plates of the F-frame from contact with the fixed plate 8, and the moving bracket 7 completely detaches from the fixed plate 8. At this time, the verification force generated by the external drive device pulling the pull rod 509 upward is transmitted sequentially along the path of pull rod 509, force sensor 508, connecting shaft, lifting plate 501, connecting assembly, and valve stem 3, without any bypass contact. The force sensor 508 is the only force measuring element on the force transmission path, and the force value measured is the actual pulling force directly acting on the valve stem 3, without any force diversion error, ensuring high accuracy and repeatability of the opening pressure verification data; the two F-frames are symmetrically arranged and simultaneously detach from the fixed plate 8, making both sides of the fixed plate 8 completely suspended, preventing accidental friction or collision interference with any parts during the verification lifting process, further improving measurement stability; When the safety valve fails to return to its original position automatically due to jamming or malfunction, and the valve stem 3 needs to be forcibly pressed down to close it, the operator rotates the positioning screw 6, causing the clamping plate above the F-frame to move down to contact the top surface of the fixed plate 8, and the clamping plate below to move up to contact the bottom surface of the fixed plate 8. The two clamping plates simultaneously clamp and limit the upper and lower surfaces of the fixed plate 8. At this time, the external drive device is activated to push the pull rod 509 downward. The transmission path of the downward force is changed to the external drive device, pull rod 509, fixed plate 8, upper and lower clamping plates, main rod, positioning screw 6, adjusting seat, lifting plate 501, connecting assembly, and valve stem 3. The force sensor 508 is completely bypassed from this force transmission path and only bears the force of the connecting shaft and lifting plate 501. The design is heavy and does not bear any reverse pressure during downward pressing. This design fundamentally avoids irreversible damage such as internal strain gauge delamination, elastomer overload deformation, or zero-point drift caused by the reverse pressure applied to the tension sensor 508 during downward pressing in traditional calibration mechanisms. It effectively protects the long-term stability and service life of the precision sensor. The F-shaped frame arranged symmetrically on both sides and the fixed plate 8 form two evenly distributed pressure points, ensuring that the lifting plate 501 is subjected to balanced force during pressing and does not tilt due to uneven load. This ensures that the forced return force on the valve stem 3 is applied evenly along the axial direction, avoiding damage to the sealing surface or bending deformation of the valve stem 3 caused by excessive force on one side of the sealing surface, and improving the safety and reliability of maintenance operations.

[0038] In practical use, the boiler safety valve online calibration and maintenance auxiliary mechanism of the present invention first covers the boiler safety valve base 1 with the frame 4 as a whole, so that the valve body 2, valve seat and valve stem 3 are located in the internal space of the frame 4. The hollow pressure plate 9 at the bottom of the frame 4 contacts the upper surface of the base 1 and is bolted to the boiler body through the mounting holes on the mounting plate, ensuring the stability of the entire mechanism during operation.

[0039] The operator adjusts the position of the moving plate 506 by sliding the slider 505 horizontally in the slide groove 504, so that the insertion rod 507 is aligned with the insertion hole at the top of the valve stem 3, passes through the insertion hole and continues to be inserted into the slot 503 on the fixed plate 502, completing the double-sided clamping and positioning of the top of the valve stem 3, and then tightens the fastening knob 14 to lock the horizontal position of the moving plate 506.

[0040] Select the working mode according to the operation requirements: When performing online verification, completely detach the movable clamp 7 from the fixed plate 8, and the external drive device pulls the pull rod 509 upward. The pulling force is transmitted to the valve stem 3 along an independent path, and the tension sensor 508 measures the tension value in real time to complete the verification; When performing forced return maintenance, engage the upper and lower clamping plates of the movable clamp 7 with the fixed plate 8, and the external drive device pushes the pull rod 509 downward. The downward pressure is transmitted to the valve stem 3 through a mechanical path to achieve forced closure, and the tension sensor 508 does not bear the reverse pressure.

[0041] This structure solves the safety hazards of valve stem misalignment, inaccurate calibration data, and high-pressure medium leakage caused by insecure fixing in existing online calibration auxiliary devices. The entire assembly operation can be completed by a single person without the need for multiple operators to cooperate, which significantly shortens the operation preparation time and reduces labor costs. At the same time, it avoids the problems of unstable fixing and misalignment that may occur with traditional temporary support splicing methods, effectively improving the safety, accuracy, and efficiency of online calibration and maintenance operations of boiler safety valves.

[0042] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to 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 invention.

[0043] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An auxiliary mechanism for online calibration and maintenance of boiler safety valves, characterized in that, The device includes a base, on which a frame is mounted. A valve body is located at the top of the base within the frame. A valve seat is located at the top of the valve body. A valve stem is located inside the valve seat. A calibration auxiliary component is located at the end of the valve stem away from the valve body within the frame. The verification auxiliary component includes a lifting plate disposed at the end of the valve stem away from the valve seat. The lifting plate is slidably connected to the inner wall of the frame, and a connecting component for detachably and fixedly connecting to the valve stem is disposed below the lifting plate. A tension sensor is fixed to the side of the lifting plate away from the valve seat via a connecting shaft. A pull rod is connected to the top of the tension sensor. The top of the pull rod passes through the top wall of the frame and is used to connect to and verify an external driving component. A fixed plate is fitted onto the end of the pull rod facing the tension sensor. A movable bracket for pressing the fixed plate is provided on the lifting plate. The movable bracket is slidably connected to the lifting plate, and the top of the movable bracket is slidably connected to the top wall of the fixed plate. A positioning screw for adjusting the position of the movable bracket is provided on the lifting plate.

2. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, Side plates are fixedly connected to both sides of the inner cavity of the frame, and limiting grooves that slide and connect with the side plates are opened on both sides of the lifting plate.

3. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, A hollow pressure plate is fixedly connected to the bottom of the frame. The bottom edge of the hollow pressure plate contacts the top of the base. A mounting plate is fixedly connected to the side of the surface of the hollow pressure plate. The surface of the mounting plate has mounting holes.

4. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, A placement frame is provided on the right side of the frame, and a clamping screw is threadedly connected to the right side of the placement frame. A clamping plate is movably connected to one end of the clamping screw. Protective pads are fixedly connected to both the clamping plate and the inner wall surface of the frame. The surface of the protective pads is provided with anti-slip texture.

5. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 4, characterized in that, A tripod is provided on the outside of the frame below the placement frame, and the tripod is detachably and fixedly connected to the placement frame.

6. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 4, characterized in that, The clamping plate is vertically provided with a limiting rod facing away from the frame. The limiting rod passes through the side wall of the placement frame and is slidably connected to the placement frame.

7. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, The connecting assembly includes a fixed plate and a movable plate disposed on the side of the lifting plate facing the valve stem, and the valve stem is disposed between the fixed plate and the movable plate; The lifting plate has a sliding groove on one side facing the valve stem, corresponding to the position of the moving plate. The sliding direction of the sliding groove is perpendicular to the side of the fixed plate facing the moving plate. A slider is provided in the sliding groove, and the slider is fixedly connected to the top wall of the moving plate. The bottom of the movable plate facing the fixed plate is provided with a plug rod, and the bottom of the fixed plate facing the movable plate is provided with a slot. The plug rod and the slot can be inserted into each other, and the valve stem is provided with a plug hole to cooperate with the plug rod.

8. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 7, characterized in that, The movable plate is provided with a sliding plate on the side opposite to the fixed plate and near the slider. The sliding plate is parallel to the lifting plate. A fastening knob is threaded through the bottom of the sliding plate. The lifting plate is provided with a threaded hole on the side facing the sliding plate to cooperate with the fastening knob. When the fastening knob is threaded into the threaded hole, the insert rod is in the insertion state with the slot.

9. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, The top of the frame is fixedly connected to a drive component mounting base for installing and verifying external drive components, and the surface of the drive component mounting base is provided with mounting holes.

10. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, A limiting ring is fixedly connected to the top of the frame, and the surface of the pull rod is movably connected to the inner cavity of the limiting ring.

11. The auxiliary mechanism for online calibration and maintenance of boiler safety valves as described in claim 1, characterized in that, The movable card holder includes two symmetrically arranged F-shaped frames. Each F-shaped frame includes a main body rod perpendicular to the lifting plate. The main body rod is provided with two clamping plates on the side facing away from the lifting plate and towards the fixed plate. The two clamping plates are arranged in parallel, and the two clamping plates are respectively abutted against the top and bottom of the fixed plate. The lifting plate is provided with an adjustment seat parallel to the main body rod, the positioning screw passes through the main body rod and is rotatably connected to the adjustment seat, and the main body rod is threadedly connected to the positioning screw; The mobile card holder has a verification working status and a maintenance working status: During the verification process, the movable card holder is completely detached from the fixed plate, allowing the external lifting force to be transmitted to the valve stem via the tension sensor. In the maintenance state, the movable bracket supports the upper and lower surfaces of the fixed plate, so that the external downward pressure is transmitted to the lifting plate through the positioning screw, and the tension sensor does not bear the reverse pressure.

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