Connection device and testing apparatus

Abstract

This application discloses a connection device and calibration equipment, relating to the field of flowmeter calibration technology, aiming to solve the technical problem that the current connection method between the flowmeter and the calibration device pipeline affects the flowmeter replacement efficiency. The connection device includes a connecting seat, a clamping component, and a driving component. The connecting seat has a supporting surface and is used to be mounted on the test pipeline. The clamping component is located on one side of the supporting surface. The fixed end of the driving component is connected to the connecting seat, and the driving end of the driving component is connected to the clamping component. The driving component drives the clamping component to move, causing the clamping component to press the element under test onto the test pipeline. The connection device provided in this application includes a clamping component and a driving component. During installation, the driving component drives the clamping component to move, pressing the element under test onto the test pipeline. When replacing the element under test, the driving component drives the clamping component to move in the opposite direction, causing the clamping component to detach from the element under test, increasing the convenience of disassembling and assembling the element under test.

Description

Technical Field

[0001] This application relates to the field of flow meter calibration technology, and in particular to a connection device and calibration equipment. Background Technology

[0002] The core of natural gas flow meter calibration is to verify the consistency between the flow meter reading and the actual flow rate, eliminate measurement errors, and ensure the accuracy and reliability of the measurement data. During calibration, the gas flow meter must be connected to the pipeline of the calibration device. This requires not only stable fixing of the mechanical structure but also meeting the sealing performance requirements under high-pressure conditions. In related technologies, natural gas flow meters and calibration devices often use flange bolt connections. Multiple circumferentially distributed bolts are manually tightened to ensure a tight fit between the flow meter flange and the device pipeline flange. While this connection method ensures reliability, it necessitates frequent disassembly and reassembly of multiple sets of bolts when calibrating different flow meters, severely impacting the flow meter replacement efficiency. Summary of the Invention

[0003] The purpose of this application is to provide a connection device and a calibration equipment, which aims to solve the technical problem that the current connection method between the flow meter and the calibration equipment pipeline affects the flow meter replacement efficiency.

[0004] A first aspect of this application provides a connecting device for connecting a test pipe and a test element, comprising a connecting seat, a clamping member, and a driving member. The connecting seat has a supporting surface and is disposed on the test pipe; the clamping member is disposed on one side of the supporting surface; the fixed end of the driving member is connected to the connecting seat, and the driving end of the driving member is connected to the clamping member, the driving member driving the clamping member to move, thereby pressing the clamping member against the test pipe.

[0005] In the above solution, the connection device provided in this application includes a clamping component and a driving component. During installation, the driving component drives the clamping component to move so that the component under test is pressed onto the test pipe. When replacing the component under test, the driving component drives the clamping component to move in the opposite direction so that the clamping component is detached from the component under test, thereby increasing the convenience of disassembling and assembling the component under test.

[0006] Optionally, the clamping member includes a lever, which is hinged to the connecting seat via a first hinge axis. The driving member includes a telescopic device, the driving end of which is hinged to one end of the lever via a second hinge axis. The other end of the lever is used to press the element under test.

[0007] Optionally, along the length of the lever, the distance between the first hinge axis and the second hinge axis is greater than the distance between the other end of the lever and the first hinge axis.

[0008] Optionally, the telescopic device includes a hydraulic cylinder, the cylinder body of which is connected to the connecting seat, and the cylinder rod of which is hinged to one end of the lever via a second hinge shaft, the cylinder rod of which is perpendicular to the support surface.

[0009] Optionally, the connecting seat includes a support plate, the support plate being hinged to the connecting seat via a third hinge axis, and the lever being hinged to the support plate via a first hinge axis.

[0010] Optionally, the lever has an arc-shaped surface at the end away from the drive member and on the side opposite to the support surface.

[0011] Optionally, the end of the test pipe is provided with a first flange, and the end of the element under test is provided with a second flange; There are multiple clamping elements and multiple driving elements. The multiple clamping elements are distributed around the center line of the first flange at equal central angles. Each clamping element is connected to the connecting seat through a driving element. The multiple clamping elements are used to press the second flange onto the first flange.

[0012] Optionally, the connecting seat includes a top plate, a back plate, and a plurality of connecting posts, the top plate and the back plate being connected by the plurality of connecting posts; the side of the top plate facing away from the back plate forms the support surface, and a connecting hole is provided through the top plate, the fixed end of the driving member being connected to the connecting hole.

[0013] A second aspect of this application provides a testing device, including a base, a test pipe, and the aforementioned connecting device, wherein the test pipe is disposed on the base; the connecting device is connected to the base and is used to press the element under test onto the test pipe.

[0014] It should be noted that the technical effects brought about by the second aspect of this application can be referred to the technical effects brought about by the corresponding implementation of the first aspect, and will not be repeated here.

[0015] Optionally, the flow meter calibration device further includes a driving device, and the connecting device is connected to the base through the driving device. The driving device is used to drive the connecting device to move along a direction perpendicular to the support surface. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a connecting device provided in an embodiment of this application; Figure 2 for Figure 1 A partial structural schematic diagram of the connecting device shown; Figure 3 A flowchart illustrating a method for calculating clamping force in a connecting device, as provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 10. Connecting device; 1. Connecting seat; 1A. Support surface; 11. Top plate; 111. Connecting hole; 12. Back plate; 13. Connecting column; 14. Third flange; 141. Through hole; 142. Third assembly hole; 2. Clamping component; 21. Lever; 3. Driving component; 31. Fixed end; 32. Driving end; 33. Telescopic device; 331. Hydraulic cylinder; 3311. Cylinder body; 3312. Cylinder rod; 4. First hinge shaft; 5. Second hinge shaft; 6. Fixing component; 7. Support plate; 8. Third hinge shaft. Detailed Implementation

[0019] In the embodiments of this application, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," "third," "fourth," "fifth," and "sixth" may explicitly or implicitly include one or more of that feature.

[0020] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0021] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0022] In the embodiments of this application, "parallel," "perpendicular," and "equal" include the described situation and situations similar to the described situation, where the range of similarity is within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, a deviation within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, a deviation within 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0023] This application provides a calibration device, which may include a base and a test pipe, the test pipe being mounted on the base. Along the axial direction of the test pipe, one end is connected to an external gas source, and the other end is connected to the component under test. For example, the external gas source may be natural gas, and the corresponding component under test may be a natural gas flow meter. This calibration device is used to calibrate a natural gas flow meter. Specifically, the calibration device assesses whether the measurement error is within the allowable range by verifying the consistency between the natural gas flow meter reading and the actual flow rate of the natural gas flowing into the test pipe, thereby ensuring the accuracy and reliability of the natural gas flow meter reading data.

[0024] In some examples, along the axial direction of the test pipe, a first flange is provided at the end of the test pipe facing the element under test, and a second flange is provided at the end of the element under test facing the test pipe. The first flange and the second flange are connected to form a seal to ensure the airtightness between the test pipe and the element under test, thereby facilitating the calibration of the natural gas flow meter.

[0025] In some examples, the verification equipment can automatically connect the first flange to the second flange and form a seal. For example, the first flange to the second flange can be connected and a seal formed by hydraulic pressure.

[0026] Alternatively, the first flange and the second flange can be connected manually to form a seal. For example, the first flange and the second flange can be connected and sealed using fasteners such as bolts.

[0027] In some examples, the calibration equipment may also include a first sealing structure disposed between the first flange and the second flange to seal the gap between the first flange and the second flange, so as to ensure the reliability of the seal between the first flange and the second flange.

[0028] In some examples, the first sealing structure can be a gasket. For instance, the gasket can be a spiral wound gasket. Spiral wound gaskets offer advantages such as good compression resilience and a wide range of temperature and pressure resistance, allowing for better sealing of the gap between the first and second flanges, thus ensuring reliable sealing between them. In other examples, the first sealing structure can also be a sealing ring, such as a rubber sealing ring.

[0029] In related technologies, the second flange of the component under test (DUT) and the first flange of the test pipe are typically connected by bolts or other fasteners. By manually tightening multiple circumferentially distributed bolts or other fasteners, a tight fit can be achieved between the second flange and the first flange. While this connection method ensures the reliability of the connection between the second flange and the first flange, it requires frequent disassembly and reassembly of multiple sets of bolts or other fasteners when rotating and inspecting different DUTs, which seriously affects the replacement efficiency of the DUTs.

[0030] Based on this, this application provides a connecting device 10 for connecting the second flange of the component under test to the first flange of the test pipe. Please refer to... Figure 1 , Figure 1 This is a schematic diagram of a connecting device provided in an embodiment of this application. The connecting device 10 is connected to the base and is used to press the component under test onto the test pipeline. In this way, the connecting device 10 can press the component under test onto the test pipeline, connecting the first flange and the second flange to form a seal, thereby ensuring the airtightness between the test pipeline and the component under test, facilitating the calibration of the natural gas flow meter. Compared to the method of connecting the second flange and the first flange using bolts or other fasteners, this pressing connection method can also ensure the reliability of the connection between the second flange and the first flange. Furthermore, it can improve the replacement efficiency of the component under test when rotating and calibrating different components under test.

[0031] In some embodiments, the calibration equipment may also include a drive device, and the connecting device 10 is connected to the base via the drive device. The drive device is used to drive the connecting device 10 to move along the length direction of the base.

[0032] The length of the base is aligned with the axial direction of the test pipe.

[0033] In this way, by setting up the driving device, the driving device can drive the connecting device 10 to move along the length of the base toward the element under test, so that the second flange of the element under test comes into contact with the first flange of the test pipeline. After the second flange comes into contact with the first flange, the connecting device 10 itself provides a clamping force to connect the first flange and the second flange and form a seal, thereby ensuring the airtightness between the test pipeline and the element under test, and facilitating the calibration of the natural gas flow meter by the calibration equipment.

[0034] In some examples, the drive unit can be an electric cylinder, a two-way cylinder, a pneumatic slide, an electric actuator, etc.

[0035] In some examples, the base is provided with a slide rail extending along the length of the base, and the connecting device 10 is provided with a slider that is slidably connected to the slide rail and connected to the connecting device 10. For example, when the driving device is an electric cylinder, the electric cylinder can push the connecting device 10 to move towards the element under test along the length of the base. Simultaneously, the slider on the connecting device 10 slides in the same direction on the slide rail, so that the second flange of the element under test contacts the first flange of the test pipeline. After the second flange contacts the first flange, the connecting device 10 itself provides a clamping force to press the second flange against the first flange, so that the element under test and the test pipeline fit tightly together, facilitating the calibration of the natural gas flow meter. This improves the stability of the connecting device 10's movement on the base.

[0036] like Figure 1 and Figure 2 As shown, Figure 2 for Figure 1 The diagram shows a partial structural schematic of the connecting device. The connecting device 10 may include a connecting seat 1, a clamping member 2, and a driving member 3. The connecting seat 1 has a supporting surface 1A and is used to be mounted on the test pipe. The clamping member 2 is disposed on one side of the supporting surface 1A. For example, the clamping member 2 may be disposed on the side facing the supporting surface 1A, that is, the side opposite to the driving member 3.

[0037] The driving component 3 may include a fixed end 31 and a driving end 32. The fixed end 31 of the driving component 3 is connected to the connecting seat 1, and the driving end 32 of the driving component 3 is connected to the clamping component 2. The driving component 3 drives the clamping component 2 to move, so that the clamping component 2 can move closer to or further away from the support surface 1A, thereby pressing the tested element onto the test pipe. The driving component 3 can also drive the clamping component 2 to move in the opposite direction, so that the clamping component 2 is detached from the tested element.

[0038] When the first and second flanges are clamped, the clamping member 2 is driven by the drive member 3 to press the component under test onto the test pipe. When the component under test is replaced, the clamping member 2 is driven by the drive member 3 to move in the opposite direction, causing the clamping member 2 to disengage from the component under test, thereby allowing the component under test to be removed and replaced, increasing the convenience of disassembly and assembly of the component under test.

[0039] In some examples, the clamping element 2 can be a cylindrical structure, a plate structure, a rod structure, a block structure, a strip structure, etc.

[0040] In some examples, the drive element 3 can be a hydraulic cylinder, pneumatic cylinder, electric cylinder, or electric actuator, etc.

[0041] In some examples, the connection between the fixed end 31 of the drive component 3 and the connecting seat 1 can be the same as the connection between the drive end 32 of the drive component 3 and the clamping component 2. For example, the fixed end 31 of the drive component 3 and the connecting seat 1, and the drive end 32 of the drive component 3 and the clamping component 2 can be fixedly connected by fasteners such as welding, snap-fitting, gluing, and bolts.

[0042] Alternatively, the connection method between the fixed end 31 of the driving component 3 and the connecting seat 1 can differ from the connection method between the driving end 32 of the driving component 3 and the clamping component 2. For example, the fixed end 31 of the driving component 3 and the connecting seat 1 can be fixedly connected by welding, snap-fitting, gluing, bolts, or other fasteners. The driving end 32 of the driving component 3 and the clamping component 2 can be rotatably connected by hinges, ball joints, pins, or other similar means.

[0043] This application is illustrated by way of example, with the fixed end 31 of the driving member 3 being fixedly connected to the connecting seat 1, and the driving end 32 of the driving member 3 being rotatably connected to the clamping member 2.

[0044] In some embodiments, there can be multiple clamping elements 2 and driving elements 3. Multiple clamping elements 2 are distributed around the center line of the first flange at the same central angle. Each clamping element 2 is connected to the connecting seat 1 through a driving element 3. One driving element 3 is used to drive one clamping element 2 to move. Multiple clamping elements 2 are used to press the second flange onto the first flange.

[0045] In this design, multiple clamping elements 2 are distributed around the centerline of the first flange at equal central angles, ensuring that the second flange is clamped at multiple points evenly distributed around its circumference. This results in uniform force distribution between the first and second flanges, effectively improving the sealing performance of the flange surfaces and preventing leakage due to insufficient local clamping force. Multi-point synchronous clamping ensures coaxiality and stability of the connection, making it suitable for high-pressure and high-precision testing scenarios.

[0046] Among them, under the premise of meeting the total clamping force requirement of the flange face, the number of driving components 3 is inversely proportional to the load of a single driving component 3. That is, when the total clamping force is fixed, the more driving components 3 there are, the smaller the thrust that a single driving component 3 needs to output.

[0047] For example, the total clamping force required for the calibration of natural gas flow meters is usually quite large. For instance, both clamping components 2 and driving components 3 can be configured with 10 units. These 10 driving components 3 can form a multi-point uniform force application structure, providing sufficient clamping force to achieve a reliable seal on the flange face while avoiding equipment damage caused by uneven localized force. This effectively improves the operational efficiency, sealing stability, and operational safety during the calibration process of natural gas flow meters.

[0048] It should be noted that the clamping force output by the driving component 3 to the clamping component 2 should first be based on the calculation result of the traditional bolt preload as the design benchmark to ensure that the clamping force output by the clamping component 2 meets the compaction and sealing pressure requirements of the metal spiral wound gasket.

[0049] For details, please refer to Figure 3 , Figure 3 A flowchart illustrating a method for calculating clamping force in a connecting device according to an embodiment of this application is provided. The calculation process of the clamping force output by the driving component 3 to the clamping component 2 is as follows: The first step is to determine the basic parameters of the component being tested.

[0050] For example, the measured component is a natural gas flow meter, model number DN300, pressure rating PN100 (i.e., calculated pressure P). c =10MPa).

[0051] In DN300, DN stands for Diameter Nominal, and the following numbers represent the nominal size of the connection interface. DN300 indicates that the nominal diameter of the second flange of the natural gas flow meter is 300mm.

[0052] In PN100, PN is an abbreviation for Pressure Nominal, and the numbers following it represent the pressure rating. PN100 This indicates that the nominal pressure of the first flange of the natural gas flow meter and the test pipeline it is used with is 100 bar, or 10 MPa.

[0053] The second step is to determine the basic parameters of the metal spiral wound gasket based on the basic parameters of the component being tested.

[0054] For example, when the natural gas flow meter is model DN300 and the pressure rating is PN100, according to standard GB / T150.3-2024, combined with the dimensions of the metal spiral wound gasket, the outer diameter of the metal spiral wound gasket is 458mm, the inner diameter is 318mm, and the thickness is 3mm.

[0055] Based on the aforementioned dimensional parameters of the metal spiral wound gasket, other relevant parameters of the metal spiral wound gasket are further determined. These include, for example, the gasket coefficient, specific pressure, effective sealing width, and the diameter of the center circle of the gasket clamping force.

[0056] In addition, the influence of the medium's operating conditions should also be considered, such as design pressure and temperature.

[0057] The third step is to calculate the minimum bolt preload required for the preload condition and the bolt preload required for the pressurization condition based on the basic parameters of the tested component and the metal spiral wound gasket. The larger of the two values ​​is taken as the design benchmark for the hydraulic clamping force.

[0058] The pressurization condition refers to the condition in which natural gas at a preset pressure is introduced into the test pipeline.

[0059] Specifically, the minimum bolt preload required for preload operation. .

[0060] Bolt preload required under pressurization conditions

[0061] Where m is the gasket coefficient, y is the specific pressure in MPa; b is the effective sealing width in mm; D G F is the diameter of the center circle where the gasket clamping force is applied, in mm. p The additional clamping load required to maintain a metal spiral wound gasket seal, measured in N.

[0062] Since the minimum bolt preload F1 required for the pre-tightening condition is less than the bolt preload F2 required for the pressurizing condition, the hydraulic clamping force should be designed based on the bolt preload F2 required for the pressurizing condition to ensure that the clamping force output by the clamping component 2 meets the gasket compaction and sealing pressure requirements. Based on this hydraulic clamping force, the arrangement and quantity of the driving component 3 and the clamping component 2 are adjusted accordingly.

[0063] Then, a mathematical model of leakage rate and bolt preload was established, and the sealing performance was quantitatively verified.

[0064] Referring to ASME and EN 1591 sealing standards, a leakage rate was established. m A mathematical model of bolt preload F2 is used to calculate the theoretical mass leakage rate by substituting the bolt preload F2 required under the above pressurization conditions into the mathematical model, and the sealing performance of the hydraulic clamping flange connection is evaluated based on the theoretical mass leakage rate.

[0065] Specifically, the sealing performance is quantified into monitorable indicators, including allowable stress of sealing components, gasket compressive stress, and flange rotation angle. The sealing performance of the flange connection under pre-tightening, pressurization, and water hammer impact conditions is analyzed using the finite element method, while considering the influence of different hydraulic clamping areas and hydraulic clamping forces on the sealing performance, until the sealing performance meets the standards.

[0066] Among them, water hammer impact refers to the process in which the fluid in the pipeline system experiences drastic pressure fluctuations due to rapid changes in flow velocity.

[0067] When considering the clamping area factor, the clamping area is set to 90%, 80%, and 70% of the original clamping area for calculation and analysis. When considering the clamping force factor, the clamping force is set to 120%, 110%, 90%, and 80% of the ideal clamping force for analysis.

[0068] The derived models for bolt preload and flange connection leakage rate at room temperature using natural gas as the medium are as follows:

[0069] in, Mass leakage rate, unit: Pa*m 3 / s; These are the regression coefficients; Clamping force; unit is N; The diameter of the center circle where the bolt preload is applied is in mm. The working pressure of the medium is expressed in MPa. Stress index; This refers to the outer diameter of the gasket; the unit is mm. This refers to the inner diameter of the gasket; the unit is mm. Temperature is measured in °C. Temperature index; The pressure of the medium is expressed in MPa. Next, deformation compatibility equations were established, and strength checks were performed.

[0070] By combining the deformation analysis of flanges, clamping components, and gaskets, the deformation coordination equation of flange connection (combining the axial deformation caused by external torque, medium pressure, and temperature) is derived. The strength of the clamping components is checked to ensure that the clamping components can maintain a stable clamping state under pre-tightening and pressurization conditions, and finally achieve efficient sealing and reliable operation of flange connection during flowmeter calibration.

[0071] If a stable clamping state cannot be maintained under pre-tightening and pressurization conditions, feedback should be provided to adjust the arrangement and quantity of the drive component 3 and the clamping component 2 until a stable clamping state can be maintained under both pre-tightening and pressurization conditions.

[0072] The sum of the axial deformations of the flange and clamping components caused by external torque, medium pressure, and temperature is equal to the compression of the gasket. Therefore, the deformation compatibility equation for the flange connection is derived as follows:

[0073] in, This refers to the gasket compression under pressure conditions, expressed in mm. This refers to the compression of the gasket under preload conditions, expressed in mm. This represents the creep variation of the gasket, in mm. This refers to the thrust of the hydraulic cylinder, measured in N. This is the distance from the lever fulcrum to the hydraulic cylinder, in mm. This represents the elastic modulus of the material, expressed in MPa. The moment of inertia of the cross section is expressed in N·mm. The length of the lever is in mm. The flange elastic coefficient at the pre-tightening operating temperature; The flange elastic modulus under pressurized operating temperature; This refers to the flange stiffness coefficient under internal pressure conditions. The clamping torque under preload conditions is expressed in N·mm. The clamping torque under pressure conditions is expressed in N·mm. The coefficient of linear expansion of the flange material under pressurized operating conditions; The coefficient of linear expansion of the flange material under pre-tightening operating temperature; This refers to the thickness of the flange, in mm. The temperature under pre-tightening conditions is expressed in °C. The temperature during clamping is expressed in °C.

[0074] Please continue reading. Figure 1 In some embodiments, the connecting seat 1 may include a top plate 11, a back plate 12, and a plurality of connecting posts 13, wherein the top plate 11 and the back plate 12 are connected by the plurality of connecting posts 13. For example, the top plate 11 is provided with a first mounting hole, and one end of the connecting post 13 facing the top plate 11 is provided with a first threaded section, the first threaded section of the connecting post 13 passing through the first mounting hole to connect the connecting post 13 and the top plate 11.

[0075] The back plate 12 is provided with a second mounting hole, and the end of the connecting post 13 facing the back plate 12 is provided with a second threaded section. The second threaded section of the connecting post 13 passes through the second mounting hole to connect the connecting post 13 and the back plate 12.

[0076] The top plate 11 forms a support surface 1A on the side opposite to the back plate 12. A connecting hole 111 is provided through the top plate 11. The fixed end 31 of the driving member 3 is disposed in the connecting hole 111 and connected to the top plate 11. For example, the fixed end 31 of the driving member 3 is provided with a first mounting hole, and the side of the top plate opposite to the support surface 1A is provided with a second mounting hole. Fasteners are inserted through the first mounting hole and the second mounting hole to connect the fixed end 31 of the driving member 3 to the top plate 11 of the connecting seat 1. The driving end 32 of the driving member 3 is disposed in the connecting hole 111 and connected to the clamping member 2.

[0077] In addition, the fixed end 31 of the drive unit 3 is also connected to the back plate 12.

[0078] In this design, the top plate 11, back plate 12, and connecting column 13 form a frame-type connecting seat 1, which has high structural rigidity, light weight, and is not easily deformed under stress. The connecting holes facilitate the rapid assembly and positioning of the driving component 3, improving assembly efficiency and installation accuracy, while reducing external space occupation and making the overall structure more compact.

[0079] In some examples, the first mounting hole can be a countersunk hole, and the fastener can be a bolt. In this way, after the bolt passes through the countersunk hole, its head does not protrude from the mounting surface, thereby avoiding interference with other components and ensuring structural compactness.

[0080] In some examples, a bushing 14 is provided on one side of the top plate 11 along the axial direction of the test pipe, and the bushing 14 is connected to the top plate 11. The test pipe passes through a through hole coaxially arranged on the bushing 14, the top plate 11, and the back plate 12. This through hole is used to guide the test pipe to facilitate its assembly. For example, the bushing 14 is provided with a plurality of third mounting holes 142 spaced apart circumferentially along the test pipe, and the top plate 11 is provided with a plurality of fourth mounting holes spaced apart circumferentially along the test pipe. The third mounting holes 142 are adapted to be connected to the fourth mounting holes by fasteners such as bolts.

[0081] Please continue reading. Figure 1 and Figure 2 In some embodiments, the clamping member 2 may include a lever 21, which is hinged to the connecting seat 1 via a first hinge axis 4. For example, the lever 21 may be hinged to the bushing 14 of the connecting seat 1 via the first hinge axis 4.

[0082] The driving component 3 may include a telescopic device 33, the driving end 32 of which is hinged to one end of the lever 21 via a second hinge shaft 5, and the other end of the lever 21 serves as a pressing end for pressing the component under test. In some examples, the telescopic direction of the telescopic device 33 is perpendicular to the support surface 1A.

[0083] In this design, the clamping member 2 adopts a lever 21 hinge structure, which amplifies the clamping force by utilizing the lever 21 principle. Even when the output force of the driving member 3 is relatively small, a large clamping force can still be obtained at the clamping end of the lever 21, thereby improving the clamping reliability and sealing effect of the connection. At the same time, the cooperation between the telescopic device 33 and the clamping member 2 can change the direction of the force applied by the driving member 3, making the structure of the connecting device 10 more compact.

[0084] In some embodiments, the telescopic device 33 may include a hydraulic cylinder 331, the cylinder body 3311 of which is connected to the connecting seat 1, and the cylinder rod 3312 of which is hinged to one end of the lever 21 via a second hinge shaft 5. The cylinder rod 3312 of the hydraulic cylinder 331 is perpendicular to the support surface 1A. For example, the cylinder body 3311 is connected to the top plate 11 of the connecting seat 1.

[0085] Wherein, cylinder body 3311 is the fixed end 31 of the aforementioned driving member 3, and cylinder rod 3312 is the driving end 32 of the aforementioned driving member 3.

[0086] With this design, the hydraulic cylinder 331 has a large output force, smooth movement, and controllable clamping force, which can provide a continuous and stable clamping force to ensure the sealing reliability between the tested component and the test pipeline; the cylinder rod 3312 is set with a vertical support surface 1A to match the driving force direction with the clamping direction, reduce component force loss, and improve force transmission efficiency.

[0087] Understandably, in other examples, the telescopic device 33 may also be a cylinder or an electric push rod, provided that the applied force meets the clamping requirements.

[0088] In some embodiments, along the length of the lever 21, the distance between the first hinge axis 4 and the second hinge axis 5 is greater than the distance between the other end of the lever 21 (i.e. the end of the lever 21 away from the second hinge axis 5) and the first hinge axis 4.

[0089] In some examples, the ratio of the distance between the first hinge axis 4 and the second hinge axis 5 to the distance between the other end of the lever 21 and the first hinge axis 4 is 1.2:1.

[0090] This design allows lever 21 to form a force-saving lever structure, where a small displacement of the driving end 32 can drive the pressing end to generate a large pressing torque, further reducing the output force requirements of the driving component 3, reducing the volume and energy consumption of the driving component 3, and improving the pressing stability of the pressing end.

[0091] In some examples, the connecting seat 1 may also include a fixing member 6, which is located on the side of the bushing 14 facing away from the top plate 11 and is connected to the bushing 14. Exemplarily, the fixing member 6 and the bushing 14 may be connected by a pin connection or by screwing, welding, or other means.

[0092] In some embodiments, the connecting seat 1 may further include a support plate 7, which is hinged to the fixing member 6 of the connecting seat 1 via a third hinge axis 8, and the lever 21 is hinged to the support plate 7 via a first hinge axis 4. In some examples, the line connecting the first hinge axis 4 and the third hinge axis 8 is parallel to the length direction of the support plate 7. Thus, the fixing member 6, the support plate 7, and the lever 21 together form a lever force-applying structure.

[0093] When clamping component 2 needs to be clamped, first control the hydraulic system to supply pressurized oil to the rodless chamber of the ten sets of hydraulic cylinders 331, so that the cylinder rod 3312 of the hydraulic cylinder 331 extends towards the component being tested. At the same time, it is necessary to ensure that the pressure and flow rate of the pressurized oil supplied to each hydraulic cylinder 331 are consistent to avoid inconsistent movement stroke of the cylinder rod 3312 of the hydraulic cylinder 331.

[0094] During the extension of the cylinder rod 3312 of the hydraulic cylinder 331, since the front end of the cylinder rod 3312 of the hydraulic cylinder 331 is hinged to the lever 21 through the second hinge shaft 5, the driving force of the hydraulic cylinder 331 can be transmitted to one end of the lever 21 connected to the second hinge shaft 5. The other end of the lever 21 (the end away from the second hinge shaft 5) is hinged to the support plate 7 through the first hinge shaft 4, and the support plate 7 is hinged to the fixing member 6 through the third hinge shaft 8. Lever 21 rotates around the axis of the first hinge shaft 4. The hydraulic pressure of the hydraulic cylinder 331 pushes lever 21 down toward the inner side of the second flange (i.e., the side of the second flange facing away from the first flange), converting the axial thrust of the cylinder rod 3312 into a clamping force of lever 21 perpendicular to the flange surface. That is, under the constraint of the support plate 7, the end of lever 21 away from the second hinge shaft 5 will gradually move to the side of the second flange facing away from the first flange and press against the second flange, so that the direction of the clamping force is consistent with the pressure direction required for the flange surface sealing, avoiding uneven force on the sealing gasket due to deviation of the force direction.

[0095] Meanwhile, the rigid support characteristics of the fastener 6 ensure that the fulcrum position does not shift when the lever 21 rotates, and there is no additional loss during torque transmission, further guaranteeing the accuracy of the force amplification factor.

[0096] During the downward pressing of lever 21, support plate 7 rotates forward through third hinge shaft 8 under the drive of lever 21 until the end of lever 21 away from second hinge shaft 5 contacts the inner side of second flange. At this time, cylinder rod 3312 stops extending and remains in this position. At this time, support plate 7 and lever 21 are in a perpendicular state, and support plate 7 contacts the outer peripheral surfaces of first flange and second flange. Thus, support plate 7, lever 21 and fixing member 6 form a claw-like structure. The pressing ends of ten sets of levers 21 together form a "ring" structure, so that second flange is tightly fitted to first flange through sealing gasket, completing the clamping process.

[0097] When it is necessary to loosen the clamping part 2, first control the hydraulic system to retract the cylinder rod 3312 of the hydraulic cylinder 331 away from the element being measured, so as to separate the clamping part 2 from the outer side of the second flange.

[0098] The principle of the loosening process of the clamping component 2 is the same as that of the clamping process of the clamping component 2, and will not be repeated here.

[0099] In some embodiments, the end of lever 21 furthest from the drive member 3 and away from the support surface 1A has an arc-shaped surface. That is, during the process of pressing the clamping member 2, the side of the lever without the arc-shaped surface contacts the inner side of the second flange on the tested element.

[0100] This design avoids interference between the side of the lever with the curved surface and other parts on the measured element, preventing the end of the lever away from the second hinge shaft 5 from not being pressed down properly, thus ensuring that the side of the lever without the curved surface fits tightly against the inner surface of the second flange.

[0101] In the description of the embodiments of this application, specific features, structures, materials or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0102] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A connection device for connecting a test line and a component under test, characterized in that include: A connecting seat (1) is provided with a support surface (1A), and the connecting seat (1) is used to be installed on the test pipe; A clamping member (2) and a driving member (3) are provided. The clamping member (2) is disposed on one side of the support surface (1A). The fixed end (31) of the driving member (3) is connected to the connecting seat (1), and the driving end (32) of the driving member (3) is connected to the clamping member (2). The driving member (3) drives the clamping member (2) to move, so that the clamping member (2) presses the element under test onto the test pipe.

2. The connecting device according to claim 1, characterized in that, The clamping member (2) includes a lever (21), which is hinged to the connecting seat (1) via a first hinge shaft (4). The driving member (3) includes a telescopic device (33), the driving end (32) of which is hinged to one end of the lever (21) via a second hinge shaft (5). The other end of the lever (21) is used to press the component under test.

3. The connecting device according to claim 2, characterized in that, Along the length of the lever (21), the distance between the first hinge axis (4) and the second hinge axis (5) is greater than the distance between the other end of the lever (21) and the first hinge axis (4).

4. The connecting device according to claim 2, characterized in that, The telescopic device (33) includes a hydraulic cylinder (331), the cylinder body (3311) of the hydraulic cylinder (331) is connected to the connecting seat (1), the cylinder rod (3312) of the hydraulic cylinder (331) is hinged to one end of the lever (21) through a second hinge shaft (5), and the cylinder rod (3312) of the hydraulic cylinder (331) is perpendicular to the support surface (1A).

5. The connecting device according to claim 2, characterized in that, The connecting seat (1) includes a support plate (7), the support plate (7) and the connecting seat (1) are hinged together by a third hinge axis, and the lever (21) and the support plate (7) are hinged together by a first hinge axis (4).

6. The connecting device according to claim 2, characterized in that, The lever (21) has an arc-shaped surface at one end away from the drive member (3) and on the side opposite to the support surface (1A).

7. The connecting device according to any one of claims 1-6, characterized in that, The test pipe is provided with a first flange at one end, and the tested element is provided with a second flange at one end. There are multiple clamping elements (2) and multiple driving elements (3). The multiple clamping elements (2) are distributed around the center line of the first flange at equal central angles. Each clamping element (2) is connected to the connecting seat (1) through a driving element (3). The multiple clamping elements (2) are used to press the second flange onto the first flange.

8. The connecting device according to any one of claims 1-6, characterized in that, The connecting seat (1) includes a top plate (11), a back plate (12) and a plurality of connecting posts (13). The top plate (11) and the back plate (12) are connected by the plurality of connecting posts (13). The side of the top plate (11) facing away from the back plate (12) forms the support surface (1A). A connecting hole (111) is provided through the top plate (11). The fixed end (31) of the driving member (3) is connected to the connecting hole (111).

9. A calibration device, characterized in that, include: Base; The test pipeline is installed on the base; The connecting device according to any one of claims 1-8, wherein the connecting device is connected to the base, and the connecting device is used to press the element under test onto the test pipe.

10. The calibration equipment according to claim 9, characterized in that, The calibration equipment also includes a drive device, and the connecting device is connected to the base through the drive device. The drive device is used to drive the connecting device to move along a direction perpendicular to the support surface (1A).

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