An on-line calibration tool for a safety valve

Abstract

The present application relates to the technical field of inspection tools, in particular to an online calibration tool for a safety valve, comprising a force sensor, a support and a traction device, and further comprising a connector connected with a valve disc of the safety valve; the connector comprises a connecting rod and a hook, and the connecting rod is a folding rod; through the setting of the connector, the connecting rod and the hook can be conveniently and quickly extended into the safety valve when the safety valve is calibrated online, and the connector is suitable for the connection needs of a square valve disc structure; the folding structure of the connecting rod can cope with the situation that the opening of the adjusting cover does not correspond or does not completely correspond to the valve disc, and only needs to be rotated and gradually screwed into the connector to meet the calibration needs of the safety valve under different situations.

Description

Technical Field

[0001] This invention relates to the field of testing tools, and more particularly to an online testing tool for safety valves. Background Technology

[0002] In cryogenic pipelines, stemless safety valves serve as core safety protection components. Their core function is to maintain the pipeline system pressure within a preset safe range. When the pressure of the medium in the pipeline exceeds the allowable threshold, they promptly release the overpressure medium, preventing damage to the pipeline and downstream equipment due to overpressure, thereby ensuring the stable and safe operation of the entire pipeline system. To ensure the safety valve functions properly and provides protection, it needs to be calibrated periodically. Currently, the core principle of online calibration for this type of stemless safety valve is as follows: an upward pulling force is applied to the valve disc, combined with the pushing force exerted by the pipeline medium pressure on the valve disc sealing surface. Under the synergistic effect of these two forces, the valve disc and valve seat achieve a seal separation. Subsequently, based on three core parameters—the sealing area of ​​the safety valve (the contact area between the valve seat and the valve disc sealing surface), the applied pulling force on the valve disc, and the actual operating pressure of the equipment (which must be lower than 90% of the safety valve's set pressure)—a preset professional algorithm is used to calculate the actual set pressure of the safety valve, thus completing the online calibration.

[0003] A safety valve is available, comprising: a valve body, a valve disc, a valve seat, a sealing head, a spring, and an adjusting cover. The valve disc adopts a square structure design and slides with the valve body through a guide groove pre-set on the inner wall of the valve body, allowing it to slide up and down along the guide groove. A pre-set gap is reserved between the lower end of the valve disc and the valve body. The adjusting cover adopts a cross-shaped structure with an opening on its side. When depressurizing, this type of safety valve mainly releases pressure from the gap between the valve seat, valve disc, and valve body. Unlike the depressurization structure of some older safety valves, it does not require a separate depressurization hole on the valve disc, and has a larger depressurization area and better structural rigidity.

[0004] However, the square-structured valve disc currently presents problems such as inconvenience in traction and lifting, and inconvenience in connecting calibration tools during online testing and verification. Summary of the Invention

[0005] The purpose of this invention is to provide an online calibration tool for safety valves, solving the problem of inconvenient installation and operation of existing calibration tools.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] An online calibration tool for a safety valve includes: a force sensor, a bracket, and a traction device, and also includes a connector for connecting to the valve disc of the safety valve;

[0008] The connector includes a connecting rod and a hook. The hook is connected to one end of the connecting rod and is used to connect to the valve disc. There are several connectors. The connectors are evenly distributed circumferentially inside the safety valve with the axis of the safety valve as the reference. The length direction of the connector is parallel to the axis of the safety valve. The free ends of the connecting rods are connected to a connector head, which is connected to a force sensor.

[0009] The connecting rod is a folding rod;

[0010] The traction device is located at the upper end of the support, the force sensor is located in the middle of the support and connected to the output shaft of the traction device, and the support is connected to the valve body or the pipeline where the safety valve is installed.

[0011] This structural design allows for easy connection of the connector to the valve disc during safety valve calibration, enabling calibration testing and meeting the calibration connection requirements for valve discs with square structures.

[0012] Furthermore, the number of connectors is two or four.

[0013] This structural design improves connection convenience when using two connectors and enhances connection stability when using four connectors.

[0014] Furthermore, the hook has an arc-shaped strip structure.

[0015] This structural design allows for easier connection to the valve disc, improving operational convenience.

[0016] Furthermore, the connecting rod is connected to the end of the hook.

[0017] This structural design improves the ease of connection, maximizes the connectable area of ​​the hook, and enhances the stability of the connection.

[0018] Furthermore, the connecting rod is a Z-shaped folded rod, and the extension direction of the hook is in the same direction as the bending direction of the connecting rod.

[0019] This structural design makes it easier to adjust and connect.

[0020] Further specifying, the connector includes a disc base and a pin head, the disc base is connected to several connecting rods, the pin head is located at the middle of the other end of the disc base, and the force sensor is provided with a pin tail connected to the pin head.

[0021] This structural design allows for easier and faster connection of the connector to the force sensor after the connector is connected to the safety valve disc, thus meeting calibration requirements.

[0022] Furthermore, the disc base is also equipped with a pipe diameter adjustment component, which is used to simultaneously adjust the distance between several connecting rods and the center of the disc base to adapt to the calibration of safety valves with different pipe diameters.

[0023] This structural design, through the adjustment of the connecting rod by the pipe diameter adjustment component, allows the calibration tool to be used to calibrate safety valves with different pipe diameters, improving its adaptability and making it highly practical.

[0024] Further defining the pipe diameter adjustment assembly, the assembly includes a cam, an elastic element, and an adjusting fixing element. The cam is rotatably located at the center of the disc base and on the side of the disc base connected to the connecting rod. The number of protrusions on the cam is the same as the number of connecting rods, and the protrusions slide against the side wall of the connecting rod. The disc base is provided with a guide rail, and the connecting rod is slidably connected to the guide rail. The elastic element is located between the connecting rod and the disc base and pushes the connecting rod towards the center of the disc base in a static state. The adjusting fixing element is located on the disc base and is connected to the cam drive.

[0025] This structural design, through the cooperation of cams, elastic elements, adjusting and fixing parts and guide rails, completes the adjustment of the connecting rod. It has a simple structure, is easy to use and has strong practicality.

[0026] Furthermore, the disc base is also provided with a tube depth adjustment component, which is used to adjust the spacing between the disc base and the safety valve after several connecting rods are inserted into the safety valve, so as to adapt to the calibration of safety valves with different tube depths.

[0027] This structural design, through the adjustment of the connecting rod by the pipe depth adjustment component, allows the spacing between the disc seat and the safety valve to be adjusted when the calibration tool is used to calibrate safety valves of different pipe depths, so as to adapt to the calibration of safety valves of different pipe depths.

[0028] Further defining the tube depth adjustment assembly, the assembly includes an outer adjustment cylinder and a reinforcing disc. The reinforcing disc is rotatably connected to the outer adjustment cylinder and forms a cylindrical structure with an open upper end. The upper part of the connecting rod is slidably connected to the reinforcing disc. The outer adjustment cylinder is threadedly connected to the disc seat, and the disc seat is entirely located inside the outer adjustment cylinder.

[0029] This structural design, through the cooperation of the outer adjusting cylinder and the reinforcing plate, can increase the distance between the reinforcing plate and the plate seat when dealing with safety valves with shallow depths, thereby avoiding excessive suspension of the connecting rod end and causing the free end to flare out or retract excessively, making it highly practical.

[0030] The beneficial effects of this invention are:

[0031] 1. With the connector, the connecting rod and hook can be easily and quickly inserted into the safety valve during online calibration, adapting to the connection requirements of the square valve disc structure.

[0032] 2. The bending structure of the connecting rod can handle situations where the opening of the adjusting cover does not correspond to or does not fully correspond to the valve disc. Simply rotate the adjusting connector and screw it in gradually to meet the calibration requirements of the safety valve under different conditions.

[0033] 3. The pipe diameter adjustment component allows the connecting rod to accommodate different models of safety valves, meaning it can be used for calibration of safety valves with different pipe diameters, making adjustment convenient and quick.

[0034] 4. The pipe depth adjustment component allows for adjustment of the position of the reinforcing plate on the connecting rod when the connecting rod extends into the safety valve and is connected to the valve disc via the hook. This adapts to safety valve calibration operations with different pipe depths, enabling the reinforcing plate to restrain the connecting rod and improve its resistance to torsion and bending. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the overall structure of an online calibration tool for a safety valve according to this application;

[0036] Figure 2 This is a structural schematic diagram from another perspective of the online calibration tool for a safety valve according to this application;

[0037] Figure 3 This is a structural cross-sectional view of an online calibration tool for a safety valve according to this application;

[0038] Figure 4 This is a schematic diagram of the structure of an online calibration tool connector for a safety valve according to this application;

[0039] Figure 5 This is a schematic diagram of the pipe diameter adjustment component in Embodiment 2 of the online calibration tool for a safety valve according to this application;

[0040] Figure 6 This is a structural diagram of some parts of the pipe diameter adjustment assembly in Embodiment 2 of the online calibration tool for a safety valve of this application;

[0041] Figure 7 This is a schematic diagram of the pipe depth adjustment component in Embodiment 3 of the online calibration tool for a safety valve according to this application;

[0042] Figure 8 This is a cross-sectional view of the pipe depth adjustment component in Embodiment 3 of an online calibration tool for a safety valve according to this application.

[0043] in,

[0044] Force sensor 1;

[0045] Bracket 2, clamp 21;

[0046] Traction device 3;

[0047] Link 4, hook 41, plate seat 42, pin head 43, pin tail 44;

[0048] Valve body 5, valve disc 51, valve seat 52, sealing head 53, spring 54, adjusting cover 55;

[0049] Cam 6, protrusion 60, hexagonal hole 601, elastic element 61;

[0050] Turbine 621, worm gear 622, connecting rod 6221, mounting base 6222, rotor 6223

[0051] Rotating column 623, fixing bolt 624

[0052] Guide rail 63

[0053] External adjusting cylinder 7, reinforcing plate 71. Detailed Implementation

[0054] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and represent schematic diagrams, not actual pictures, and should not be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some components in the figures may be omitted, enlarged, or reduced, and do not represent the actual product size; it is understandable for those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0055] In the figures of this invention, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the figure, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the figures are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0056] Example 1:

[0057] like Figure 1-4 As shown, an online calibration tool for a safety valve according to the present invention includes: a force sensor 1, a bracket 2 and a traction device 3, and also includes a connector connected to the valve disc 51 of the safety valve, wherein the adjusting cover 55 of the safety valve is generally cross-shaped, and there is an opening between the adjusting cover 55 and the inner wall of the safety valve.

[0058] The connector includes a connecting rod 4 and a hook 41. The hook 41 is connected to one end of the connecting rod 4 and is used to connect to the valve disc 51. There are several connectors. The connectors are evenly distributed around the safety valve in the circumference with reference to the axis of the safety valve. The length direction of the connector is parallel to the axis of the safety valve. The free ends of the several connecting rods 4 are connected to a connector head, which is connected to the force sensor 1.

[0059] Link 4 is a folding link;

[0060] The traction device 3 is installed on the upper end of the bracket 2, the force sensor 1 is installed in the middle of the bracket 2 and connected to the output shaft of the traction device 3, and the bracket 2 is connected to the valve body 5 or the pipeline where the safety valve is installed.

[0061] Before calibrating the safety valve, first connect the connector to the valve disc 51 inside the safety valve. When connecting, hold the connector head, and then insert the connecting rod 4 and hook 41 connected to the connector head into the safety valve through the opening between the adjusting cover 55 and the valve body 5 until the hook 41 abuts against the upper end of the valve disc 51. At this time, make a fine adjustment rotation so that the hook 41 corresponds to or directly falls from the space between the side of the valve disc 51 and the valve body 5 into the lower side of the valve disc 51 until it corresponds to the gap position between the lower side of the valve disc 51 and the valve body 5. Finally, rotate the connecting rod 4 again to make the hook 41 rotate until it is locked into the gap between the lower side of the valve disc 51 and the valve body 5.

[0062] After the connector is installed, the bracket 2 is installed in a suitable fixed position or directly connected to the valve body 5. In this application, a clamp connection method is used. A clamp 21 is provided on the lower side of the bracket 2. The clamp is semi-circular and made of elastic material. There are two clamps, which cooperate with each other to form a ring. The two clamps are connected by bolts. Both clamps are connected to the bracket 2. In this way, when installing the bracket 2 for calibration preparation, the clamps only need to be clamped onto the valve body 5. In other embodiments, a threaded connection method can also be used to connect it to the valve port of the valve body 5. After the bracket 2 is installed, the connector head is connected to the force sensor 1. Finally, the test parameters are set through a control device, such as a control panel, mobile phone or remote control device. For those skilled in the art, any control device with equipment control capability and sensor data reading capability required for calibration, such as calibrating tensile force and reading data from the force sensor 1. In this application, the force sensor 1 is a ring-type force sensor 1. In other embodiments, an S-type force sensor 1 can also be used for detection.

[0063] During testing, the traction device 3 is activated to apply a pulling force to the force sensor 1. The connector is connected to the detection end of the force sensor 1. Therefore, by pulling the connector through the force sensor 1, the pulling resistance between the connector and the valve disc 51 of the safety valve will be detected. The test is completed when the pipeline medium is released from the safety valve. The traction device 3 is an electric hydraulic cylinder, but an electric pneumatic cylinder or other devices with linear pulling capability can also be used.

[0064] Specifically, since the opening of the regulating cover 55 does not correspond or does not completely correspond to the area between the side of the valve disc 51 and the safety valve when the opening of the regulating cover 55 is in a silent state, the connecting rod 4 is designed as a folding rod. When the opening of the regulating cover 55 does not correspond, the position of the adjusting connecting rod 4 can be adjusted by rotating it, so that the hook 41 can be more flexibly aligned and connected after being inserted into the safety valve.

[0065] The number of connectors is two or four.

[0066] In this embodiment, when the number of connectors is two and they are centrally symmetrically distributed, the installation can be completed more quickly during connection. When the number of connectors is four and they are centrally symmetrically distributed, the connection stability between the connectors and the valve disc 51 can be improved, thus improving the stability of detection. In other embodiments, other numbers of connectors, such as three, can also be selected.

[0067] Hook 41 has an arc-shaped strip structure.

[0068] In this embodiment, the arc-shaped hook 41 structure is more compatible with the spatial structure inside the safety valve. By rotating the connecting rod 4, the hook 41 can be connected to the valve disc 51 with a larger contact area, which can improve the efficiency of connection and installation, improve the convenience of operation, and improve the stability of verification. In other embodiments, the hook 41 can also adopt a straight rod structure.

[0069] The connecting rod 4 is connected to the end of the hook 41.

[0070] In this embodiment, the connecting rod 4 is connected to the end of the hook 41, which maximizes the connectable area between the hook 41 and the valve disc 51, improves the convenience of connecting the operating room, and reduces the time and difficulty of alignment adjustment. In other embodiments, the connecting rod 4 can also be connected to other positions of the hook 41, such as the middle.

[0071] Link 4 is a Z-shaped folding rod, and the extension direction of hook 41 is in the same direction as the bending direction of link 4.

[0072] In this embodiment, the Z-shaped folding rod has a more regular structure and is easier to adjust. The extension direction of the hook 41 is the same as the bending direction of the connecting rod 4, which is more conducive to adjustment. In other embodiments, the connecting rod 4 can also be a folding rod with other structures, such as an S-shaped folding rod.

[0073] The connector includes a disc base 42 and a pin head 43. The disc base 42 is connected to several connecting rods 4. The pin head 43 is located at the middle of the other end of the disc base 42. The force sensor 1 is provided with a pin tail 44 connected to the pin head 43.

[0074] In this embodiment, the plate base 42 is used to connect several connecting rods 4 to achieve the effect of synchronous pulling. The pin head 43 is used to cooperate with the pin tail 44 on the force sensor 1. The pins are combined and connected by using pins such as pins or bolts to meet the connection requirements for testing and verification. In other embodiments, other connection methods, such as threaded connections, can also be used.

[0075] The working principle of this embodiment is as follows:

[0076] Before conducting the verification test, first connect the connector to the valve disc 51 inside the safety valve, then fix the bracket 2 in place to keep its relative position fixed, then connect the force sensor 1 to the connector, and finally start the traction device 3 through the control panel to apply a verification pull force to the force sensor 1 until the safety valve actively releases the medium, and then read the data from the force sensor 1 for calculation.

[0077] Example 2:

[0078] like Figure 5-6 As shown, the only structural difference between this embodiment and Embodiment 1 is that the disc base 42 is also provided with a pipe diameter adjustment component. The pipe diameter adjustment component is used to synchronously adjust the distance between several connecting rods 4 and the center of the disc base 42 to adapt to the calibration of safety valves with different pipe diameters.

[0079] The pipe diameter adjustment assembly includes a cam 6, an elastic element 61, and an adjustment fixing element. The cam 6 is rotatably located at the center of the disc base 42 and on the side of the disc base 42 connected to the connecting rod 4. The number of protrusions 60 on the cam 6 is the same as the number of connecting rods 4, and the protrusions 60 slide against the connecting rods 4. The disc base 42 is provided with a guide rail 63, and the connecting rod 4 is slidably connected to the side wall of the guide rail 63. The elastic element 61 is located between the connecting rod 4 and the disc base 42, and pushes the connecting rod 4 to move towards the center of the disc base 42 in a static state. The adjustment fixing element is located on the disc base 42 and is connected to the cam 6 for transmission. Apart from this, the rest of the structure is the same as in Embodiment 1.

[0080] In this embodiment, since the inner diameter of different models of safety valves may vary, in order to adapt to the calibration of different safety valves, the connecting rod 4 is pre-adjusted by the pipe diameter adjustment component before being inserted into the safety valve, or the connecting rod 4 is inserted into the valve body and then adjusted by the pipe diameter adjustment component. During adjustment, the cam 6 is rotated so that the protrusion 60 of the cam 6 approaches the connecting rod 4.

[0081] When the protrusion 60 of the cam 6 abuts against the connecting rod 4, the connecting rod 4 is slidably connected to the guide rail 63, and is therefore pushed away from the center of the disc seat 42 along the guide rail 63. All four connecting rods 4 expand outward at the same time, that is, they are adjusted to fit the valve body with a larger inner diameter. Conversely, when the protrusion 60 of the cam 6 moves away from the connecting rod 4, the connecting rod 4 is pushed by the elastic element 61, and the connecting rod 4 moves along the guide rail 63 towards the center of the disc seat 42, that is, it is adapted to the valve body with a smaller inner diameter. Finally, after the adjustment is appropriate, the cam 6 is locked by the adjusting fixing element.

[0082] In this embodiment, the elastic element 61 is a spring, but in other embodiments it can be a sheet. To improve the ease of adjustment, the frictional force of the cam in its static state is greater than the tension force of several elastic elements at their maximum compression. This prevents changes in the cam's position due to the self-resetting push of the elastic elements.

[0083] In practice, depending on the actual situation, a rack that is fixedly connected to the connecting rod 4 is circumferentially set on the disc base 42, and a gear that meshes with each rack is rotatably installed on the disc base 42 so that the rotation of the gear drives several connecting rods 4 to move synchronously.

[0084] The adjusting and fixing components include a turbine 621 and a worm gear 622;

[0085] The turbine 621 is fixedly connected to the cam 6;

[0086] The worm gear 622 is rotatably mounted on the disc base 42 and meshes with the turbine 621.

[0087] In practice, depending on the actual situation, a vertically mounted locking bolt on the disc base 42 can be used as an adjusting and fixing component. In use, the cam 6 is rotated directly, and after it is rotated to the correct position, the locking bolt is tightened so that it rests against the end face of the cam 6, thereby fixing the cam 6. In this embodiment, the turbine 621 and worm gear 622 are used as adjusting and fixing components. By utilizing the self-locking properties of the turbine 621 and worm gear 622, the rotation of the cam 6 can be completed while the cam 6 is fixed, making it more convenient to use.

[0088] Both the cam 6 and the turbine 621 have hexagonal holes 601.

[0089] A through hole is provided axially on the disk base 42;

[0090] A rotating column 623 is inserted through the through hole. The upper end of the rotating column 623 is integrally formed with a limiting platform. The outer diameter of the limiting platform is larger than the outer diameter of the through hole.

[0091] The lower end of the rotating column 623 is integrally formed with a hexagonal column that passes through two hexagonal holes 601;

[0092] A fixing bolt 624 is screwed to the end of the hexagonal column away from the limiting platform. The outer diameter of the bolt head of the fixing bolt 624 away from the rotating column 623 is larger than the outer diameter of the hexagonal hole 601.

[0093] In practice, depending on the actual situation, a rotating pin can be installed between the cam 6 and the disc base 42 to achieve a rotating connection between the cam 6 and the disc base 42. Then, the turbine 621 can be directly welded to the cam 6. In this embodiment, the rotating installation between the cam 6 and the disc base 42 is completed through the mutual cooperation of the hexagonal hole 601, through hole, rotating column 623, limiting platform, hexagonal column and fixing bolt 624, and the purpose of fixing the turbine 621 to the cam 6 is achieved. The structure is simple, the installation is convenient, and the practicality is strong.

[0094] The end of the worm gear 622 is coaxially provided with a connecting rod 6221, and a mounting seat 6222 is installed on the disc base 42. The connecting rod 6221 is rotatably mounted on the mounting seat 6222, and a rotating wheel 6223 is installed at the end of the connecting rod 6221 away from the worm gear 622.

[0095] In practice, depending on the actual situation, a sleeve can be welded onto the disc base 42, and a rod can be rotatably installed inside the sleeve on the worm 622. The rotational installation between the worm 622 and the disc base 42 is completed by the mutual cooperation between the rod and the sleeve. In this embodiment, the rotational installation between the worm 622 and the disc base 42 is completed by the mutual cooperation between the connecting rod 6221 and the mounting base 6222. The structure is simple, the installation is convenient, and the practicality is strong.

[0096] Example 3:

[0097] like Figure 7-8 As shown, the only structural difference between this embodiment and Embodiment 1 is that the disc base 42 is also provided with a tube depth adjustment component. The tube depth adjustment component is used to adjust the spacing between the disc base 42 and the safety valve after several connecting rods 4 are inserted into the safety valve, so as to adapt to the calibration of safety valves with different tube depths.

[0098] The tube depth adjustment assembly includes an outer adjustment cylinder 7 and a reinforcing plate 71. The reinforcing plate 71 is rotatably connected to the outer adjustment cylinder 7 and forms a cylindrical structure with an open upper end. Taking the bend of the connecting rod 4 as a reference, the part above the bend of the connecting rod 4 is slidably connected to the reinforcing plate 71. The outer adjustment cylinder 7 is threadedly connected to the plate seat 42, and the plate seat 42 is entirely located inside the outer adjustment cylinder 7. Apart from this, the rest of the structure is the same as in Embodiment 1.

[0099] In this embodiment, since different models of safety valves have different pipe depths, the connecting rod 4 needs to be set to a longer length to adapt to the calibration of different safety valves. However, when used for safety valves with shallower depths, this results in a problem with the connecting rod 4 being too long. The exposed part of the connecting rod 4 is prone to twisting and deformation, which can lead to damage. To improve the protection and anti-twist ability of the connecting rod 4, before calibration, the distance between the reinforcing plate 71 and the plate seat 42 is initially adjusted by the pipe depth adjustment component according to the depth of the valve body. That is, the position of the reinforcing plate 71 on the connecting rod 4 is adjusted to adapt to safety valves with different pipe depths and to improve the overall strength of the connecting rod during calibration.

[0100] During adjustment, pinch the pin 43 and rotate the outer adjusting cylinder 7. Since the reinforcing plate 71 is slidably connected to several connecting rods 4 and the plate seat 42 is relatively fixed, rotating the outer adjusting cylinder 7 will cause the reinforcing plate 71 to move along the connecting rod 4. After ensuring that the hook 41 on the connecting rod 4 is hooked and connected to the valve disc, continue to rotate the outer adjusting cylinder 7 until the reinforcing plate 71 abuts against the upper end face of the valve body. At this time, the position of the reinforcing plate 71 on the connecting rod 4 moves downward. In this way, the reinforcing plate 71 can provide binding support for the middle and lower part of the connecting rod 4, thereby playing an anti-torsion role for the connecting rod 4. This avoids the torsional deformation of the connecting rod 4 when it is pulled upward when facing a safety valve with a shallow pipe depth, thereby improving the overall stability of the calibration tool. In some other embodiments, a telescopic connecting rod 4 structure can also be used, such as dividing the connecting rod 4 into at least two equal parts. The two ends of the connecting rod 4 are connected by a pin, thread or other connection structure to achieve the adjustable effect of the hook 41 on the lower side of the connecting rod 4.

[0101] In fact, the bent part of the connecting rod can be as close as possible to the position of the hook. This allows the bent part of the connecting rod to be inserted into the safety valve as early as possible when installing the tool, and then the position of the reinforcing plate on the connecting rod can be adjusted by the pipe depth adjustment component.

[0102] In some embodiments, to prevent deformation or bending of the connecting rod 4 and hook 41 under high stress, which could lead to errors in calibration or damage to the tools, the bent parts of the connecting rod 4 and hook 41 can be chamfered to improve the stress resistance of the bent parts of the connecting rod 4. At the same time, in order to make the hook 41 adaptable to the inner wall width of safety valves with different pipe diameters, the connecting rod 4 can also be set as a round rod structure to improve the fit.

[0103] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. An online calibration tool for safety valves, comprising: The force sensor (1), bracket (2) and traction device (3) are characterized in that: they also include a connector for connecting to the valve disc (51) of the safety valve; The connector includes a connecting rod (4) and a hook (41). The hook (41) is connected to one end of the connecting rod (4). The hook (41) is used to connect to the valve disc (51). There are several connectors. The connectors are evenly distributed around the safety valve along the axis of the safety valve. The length direction of the connector is parallel to the axis of the safety valve. The free ends of the connecting rods (4) are connected to a connector head. The connector head is connected to the force sensor (1). The connecting rod (4) is a folding rod; The traction device (3) is set on the upper end of the bracket (2), the force sensor (1) is set in the middle of the bracket (2) and connected to the output shaft of the traction device (3), and the bracket (2) is connected to the valve body (5) or the pipe on which the safety valve is installed; The connector includes a disc base (42) and a pin head (43). The disc base (42) is connected to several connecting rods (4). The pin head (43) is located at the middle of the other end of the disc base (42). The force sensor (1) is provided with a pin tail (44) connected to the pin head (43). The disc base (42) is also provided with a pipe diameter adjustment component, which is used to synchronously adjust the distance between several connecting rods (4) and the center of the disc base (42) to adapt to the calibration of safety valves with different pipe diameters; The pipe diameter adjustment assembly includes a cam (6), an elastic element (61), and an adjustment fixing element. The cam (6) is rotatably located at the center of the disc base (42) and on the side of the disc base (42) connected to the connecting rod (4). The number of protrusions (60) of the cam (6) is the same as the number of connecting rods (4), and the protrusions (60) slide against the side wall of the connecting rod (4). The disc base (42) is provided with a guide rail (63), and the connecting rod (4) is slidably connected to the guide rail (63). The elastic element (61) is located between the connecting rod (4) and the disc base (42) and pushes the connecting rod (4) to move towards the center of the disc base (42) in a static state. The adjustment fixing element is located on the disc base (42) and is connected to the cam (6) in a transmission connection.

2. An online calibration tool for safety valves, comprising: The force sensor (1), bracket (2) and traction device (3) are characterized in that: they also include a connector for connecting to the valve disc (51) of the safety valve; The connector includes a connecting rod (4) and a hook (41). The hook (41) is connected to one end of the connecting rod (4). The hook (41) is used to connect to the valve disc (51). There are several connectors. The connectors are evenly distributed around the safety valve along the axis of the safety valve. The length direction of the connector is parallel to the axis of the safety valve. The free ends of the connecting rods (4) are connected to a connector head. The connector head is connected to the force sensor (1). The connecting rod (4) is a folding rod; The traction device (3) is set on the upper end of the bracket (2), the force sensor (1) is set in the middle of the bracket (2) and connected to the output shaft of the traction device (3), and the bracket (2) is connected to the valve body (5) or the pipe on which the safety valve is installed; The connector includes a disc base (42) and a pin head (43). The disc base (42) is connected to several connecting rods (4). The pin head (43) is located at the middle of the other end of the disc base (42). The force sensor (1) is provided with a pin tail (44) connected to the pin head (43). The disc base (42) is also provided with a tube depth adjustment component. The tube depth adjustment component is used to adjust the spacing between the disc base (42) and the safety valve after several connecting rods (4) are inserted into the safety valve, so as to adapt to the calibration of safety valves with different tube depths. The tube depth adjustment assembly includes an outer adjustment cylinder (7) and a reinforcing plate (71). The reinforcing plate (71) is rotatably connected to the outer adjustment cylinder (7) and forms a cylindrical structure with an open top. The upper part of the connecting rod (4) is slidably connected to the reinforcing plate (71). The outer adjustment cylinder (7) is threadedly connected to the plate seat (42), and the plate seat (42) is located entirely inside the outer adjustment cylinder (7).

3. An online calibration tool for a safety valve according to claim 1 or 2, characterized in that: The number of connectors is two or four.

4. An online calibration tool for a safety valve according to claim 1 or 2, characterized in that: The hook (41) has an arc-shaped strip structure.

5. The online calibration tool for a safety valve according to claim 4, characterized in that: The connecting rod (4) is connected to the end of the hook (41).

6. The online calibration tool for a safety valve according to claim 4, characterized in that: The connecting rod (4) is a Z-shaped folded rod, and the extension direction of the hook (41) is in the same direction as the bending direction of the connecting rod (4).

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