Quick mounting device for pipeline flange and using method

Abstract

According to the rapid installation device and method for the pipeline flange, flange gaskets and flange bolts are installed and uninstalled through stretching and retracting of a plurality of double-acting air cylinders, a motor drives a gear to be meshed to achieve installation of flange nuts, the influence of flange disc face sinking generated when the bolts are pre-tightened is reduced by controlling the rotating speed of the motor, and therefore the pipeline flange can be rapidly installed. The mutual influence of the pre-tightening force between the bolts is reduced, so that the pre-tightening force of the bolts is more uniform; according to the method, on the basis of the resistance strain effect, the false strain error of the resistance strain gauge caused by temperature change during detection is reduced, the influence of the bolt pre-tightening times on bolt pre-tightening is considered, and the relationship between the pre-tightening times and the motor rotating speed is established. Meanwhile, the relationship between the bolt pre-tightening force and the fatigue life of the bolt and the rotating speed of the motor is established, the bolt is prevented from being broken, and the sealing performance of the flange is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of pipeline flange installation, and in particular to a pipeline flange quick installation device and a use method. Background Art

[0002] Pipe flange is a kind of connector that is easy to disassemble and is widely used in the petroleum and chemical industries. It forms a forced sealing structure with gaskets and nuts, and plays the role of connecting various pressure-bearing equipment and making them form a pipe network system. The nut preload in the flange connection system has a great influence on the system seal and the stiffness and strength of each component.

[0003] Applying precise and uniform bolt preload can not only improve the reliability, tightness and rigidity of the connection, but also improve the anti-loosening ability and fatigue resistance of the bolts; however, if the preload value is too high or too low, it may cause the flange sealing structure to fail or the bolts to loosen, thus causing leakage. At the same time, when the parameters such as the medium temperature or pressure in production change, it may cause the sealing of the flange and gasket to fail, causing leakage of the connection structure, resulting in waste of resources and environmental pollution. It can be seen that it is very important to determine the nut preload of the flange connection system. However, there are many technical problems that cannot be ignored during flange installation: the order of preload bolts in the preload process of the pipeline flange is different, which has a great impact on the sealing of the flange. In the bolt flange connection, since all bolts cannot be loaded at the same time, but there is a certain sequence, the bolts loaded later will cause concave deformation on the flange surface when clamping, and the concave part will affect the preload force of the bolts loaded in front, causing the load of the front bolts to decrease, resulting in the interaction between the bolts, and the uneven actual preload force of each bolt, which seriously affects the sealing of the flange. The "false strain" caused by ignoring the strain gauge when detecting the flange preload due to load changes results in the nut preload after installation being too large or too small. Currently, no scholar has discussed how to effectively eliminate the detection error caused by this. Summary of the invention

[0004] In response to the above problems, this paper invents a quick installation device and method for pipe flanges, which accurately detects the preload force of flange bolts and can correctly apply the preload force. First, the various modules of the device are assembled, and then the device is installed and fixed on the pipeline through the expansion and contraction of a large double-acting cylinder. The flange gasket is installed first, followed by the installation of the flange nut and data detection. The present invention relies on digital detection, aiming to achieve accurate installation of pipe flanges while improving work efficiency and ensuring the safety of operators.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A quick installation device for a pipeline flange comprises a flange gasket installation module, a flange bolt pushing module, a flange nut installation module, and a resistance strain gauge.

[0007] The flange bolt pushing module is arranged at the left end of the flange to be installed, the flange nut mounting module is arranged at the right end of the flange to be installed, the flange gasket mounting module is arranged on the outside of the flange nut mounting module, and the resistance strain gauge is arranged on the bolt surface of the flange, characterized in that:

[0008] The flange bolt pushing module includes a pushing rod, a cylinder, a fastening groove, a fixing plate, a bolt plate, an arc-shaped fixing plate, a large cylinder, a fixing part, and a protective shell;

[0009] The flange nut installation module includes a motor driving gear, a composite external gear, a special bearing, an internal gear, a circular drive motor, a motor, a rotating shaft, a motor fixing plate, a nut positioning joint, a cylinder groove, a fastening cylinder, a protective cover, and a fixing ear;

[0010] The flange gasket installation module includes a gasket installation plate, an action rod, a lifting lug, a fastening double-acting cylinder groove, a double-acting cylinder, a gasket installation frame, and a gasket plate;

[0011] Furthermore, the bolt plate at the center of the flange bolt push module is spliced ​​in half, and the outer side of the bolt plate is the protective shell. The two cylinders and the two fastening grooves on the outer side of the protective shell are fixed by four arc-shaped fixing plates, and their positions are symmetrically installed. The telescopic ends of the two cylinders are connected to the two push rods, and the telescopic ends of the two fastening cylinders installed on the fastening grooves are connected to the two fixing members.

[0012] Furthermore, two motors are fixed at the right ends of the two outermost fixing plates in the flange nut mounting module, and their positions are symmetrical and both are fixed on the protective cover, two fastening cylinders are fixed on the two cylinder grooves, and the cylinder grooves are fixed on the protective cover, and the two motor driving gears at the center of the fixing plate are connected to the motor, and the two motor driving gears are meshed with the compound external meshing gears, and the compound external meshing gears are fitted with the special bearings, and the compound external meshing gears are meshed with the sixteen external meshing gears, and the external meshing gears are fixed to the sixteen nut locating heads, and the right side of the nut locating head is connected to the thirteen rotating shafts and the three circular drive motors;

[0013] Further, the double-acting cylinder at the outermost side of the flange gasket mounting module is fixed by the fastening double-acting cylinder groove, the fastening double-acting cylinder groove is fixed to the mounting plate, the telescopic end of the double-acting cylinder is connected to the lifting ear, the upper end of the action rod is connected to the lifting ear, the lower end of the action rod is connected to the gasket mounting frame, the gasket mounting frame is connected to the mounting plate, and the gasket plate located at the lower end of the gasket mounting frame is connected to the gasket mounting frame;

[0014] Further, the installed flange is arranged on the left side of the quick installation device of the pipeline flange, and is the flange after installation, and the resistance strain gauge is arranged on the surface of each bolt;

[0015] On the other hand, the present application provides a method for quickly installing a pipe flange, which is applied to a quick installation device for a pipe flange as described above, comprising:

[0016] Acquire attribute information of the flange to be installed, and fix the flange to be installed on the quick installation device of the pipeline flange, wherein the attribute information includes the number of bolts, flange type, predetermined value of bolt preload and target bolt preload;

[0017] Assemble the flange bolt pushing module, flange nut installation module and flange gasket installation module, control the flange gasket installation module to push the flange gasket to be stably installed in the flange plate, and after the cylinder returns to its position, control the flange bolt pushing module to install the bolts to the corresponding bolt hole positions. After the bolts are installed, pre-tighten the flange bolts by controlling the speed of the driving motor of the flange nut installation module;

[0018] In order to ensure that the bolts are aligned parallel to each other during flange installation and that the gasket is fixed at the corresponding position of the flange, the motor in the flange nut installation module is driven to install the bolts with a 30% target preload force, and the first bolt strain data and the first surface temperature of the bolt are recorded in real time through the resistance strain gauge;

[0019] When the bolt strain data reaches 30% of the target preload requirement, the greater the preload when preloading the bolt, the more obvious the elastic interaction between the bolt and the flange connection. Therefore, by slowing down the motor speed and increasing the torque, the bolt is installed with 70% of the target preload, and the second bolt strain data and the second surface temperature of the bolt are recorded in real time through the resistance strain gauge.

[0020] Obtaining a sensitivity correction coefficient of the resistance strain gauge as it changes with temperature;

[0021] Since the bolt will have obvious elastic interaction after reaching 70% of the target preload, the corrected preload is calculated based on the measurement data of the resistance strain gauge, and the bolt is installed with 100% of the target preload based on the corrected preload.

[0022] Further, it is determined whether the corrected preload force meets the installation error range according to the corrected preload force and the target preload force, and the judgment standard is:

[0023]

[0024] F 修正后 =K a EεA

[0025] Among them, F 修正后 is the corrected preload force, F a is the target bolt preload, S is the error value, K a is the sensitivity correction coefficient of the resistance strain gauge, E is the elastic modulus of the bolt; A is the axial cross-sectional area of ​​the bolt, and ε is the bolt strain size;

[0026] Further, if the corrected preload force satisfies the installation error range, the bolt is installed according to the corrected preload force and the target preload force, specifically:

[0027] Further, when the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is greater than zero, the preload after the bolt is installed with 100% of the target preload is increased;

[0028] Further, when the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is less than zero, the preload after the bolt is installed with 100% of the target preload is reduced.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a quick installation device and method for a pipe flange, which realizes the precise installation of the pipe flange nut. At the same time, because the motor drives all bolts to be pre-tightened in an orderly manner, the concave deformation of the flange surface during the bolt pre-tightening can be effectively reduced, the elastic interaction of the bolts can be reduced, and the uniformity of the bolt pre-tightening force applied by each bolt can be ensured to meet the design requirements of the flange, thereby improving the sealing of the flange. Considering the "false strain" effect when the strain gauge detects the flange pre-tightening force, the present invention sets the sensitive correction coefficient K according to the sensitive grid characteristics inside the strain gauge. a , which improves the accuracy of the device in stress detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0032] Figure 2It is a structural schematic diagram of the device of the present invention during installation in a pipeline;

[0033] Figure 3 It is a partial structural schematic diagram of a flange nut mounting module and a flange gasket mounting module of the device of the present invention;

[0034] Figure 4 It is a structural schematic diagram of a flange nut installation module of the device of the present invention;

[0035] Figure 5 This is a schematic diagram of the structure of the device of the present invention when pre-tightening the flange;

[0036] Figure 6 is a flow chart of the method of the present invention;

[0037] Figure 7 The overall result flow chart of the method of the present invention is as follows;

[0038] Among them, the gasket mounting plate 1-1, the push rod 1-2, the lifting ear 1-3, the fastening double-acting cylinder groove 1-4, the double-acting cylinder 1-5, the gasket mounting frame 1-6, the pad 1-7, the acting rod 2-1, the cylinder 2-2, the fastening groove 1-3, the fixing plate 2-4, the bolt plate 2-5, the arc-shaped fixing plate 2-6, the large cylinder 2-7, the fixing part 2-8, the protective shell 2-9, the motor driving gear 3-1, the compound external meshing gear 3-2, the special bearing 3-3, the external meshing gear 3-4, the circular driving motor 3-5, the motor 3-6, the motor fixing plate 3-7, the rotating shaft 3-8, the nut positioning joint 3-9, the protective cover 3-10, the cylinder groove 3-11, the fastening cylinder 3-12, the fixing ear 3-13, the installed flange 4, the flange bolt 4-1, the flange nut 4-2, and the resistance strain gauge 5. DETAILED DESCRIPTION

[0039] In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation examples of the present invention, and the directional words such as up, down, left, and right mentioned in the text are limited to the positional relationship of the devices in the drawings. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0040] A quick installation device and method for using a pipe flange, which can accurately detect the preload force of the flange bolt and correctly apply the preload force. First, the modules of the device are assembled, and then the device is installed and fixed on the pipeline through the expansion and contraction of a large double-acting cylinder. The flange gasket is installed first, followed by the installation of the flange nut and data detection. The present invention relies on digital detection, aiming to achieve accurate installation of the pipe flange, improve work efficiency, and ensure the safety of operators.

[0041] The technical solution adopted by the present invention is as follows:

[0042] A quick installation device for pipe flanges, such as Figure 1-Figure 5 It includes a flange gasket installation module, a flange bolt pushing module, a flange nut installation module, and a resistance strain gauge;

[0043] The flange bolt pushing module is arranged at the left end of the flange to be installed, the flange nut mounting module is arranged at the right end of the flange to be installed, the flange gasket mounting module is arranged on the outside of the flange nut mounting module, and the resistance strain gauge 5 is arranged on the bolt surface of the flange, characterized in that:

[0044] The flange bolt pushing module includes a pushing rod 2-1, a cylinder 2-2, a fastening groove 2-3, a fixing plate 2-4, a bolt plate 2-5, an arc-shaped fixing plate 2-6, a large cylinder 2-7, a fixing part 2-8, and a protective shell 2-9;

[0045] The flange nut mounting module includes a motor driving gear 3-1, a composite external meshing gear 3-2, a special bearing 3-3, an internal meshing gear 3-4, a circular driving motor 3-5, a motor 3-6, a motor fixing plate 3-7, a rotating shaft 3-8, a nut positioning joint 3-9, a cylinder groove 3-11, a fastening cylinder 3-12, a protective cover 3-10, and a fixing ear 3-13;

[0046] The flange gasket installation module includes a gasket installation plate 1-1, an action rod 1-2, a lifting ear 1-3, a fastening double-acting cylinder groove 1-4, a double-acting cylinder 1-5, a gasket installation frame 1-6, and a gasket plate 1-7;

[0047] The bolt plate 2-5 at the center of the flange bolt push module is spliced ​​in half, and the outer side of the bolt plate is the protective shell 2-9. The two cylinders 2-2 and the two fastening grooves 2-3 on the outer side of the protective shell are fixed by the four arc-shaped fixing plates 2-6 and the fixing plate 2-4, and their positions are symmetrically installed. The telescopic ends of the two cylinders 2-2 are connected to the two push rods 2-1, and the telescopic ends of the two fastening cylinders installed on the fastening grooves 2-3 are connected to the two fixing members 2-8.

[0048] The two motors 3-6 are fixed on the right ends of the two outermost motor fixing plates 3-7 in the flange nut mounting module, and their positions are symmetrical and both are fixed on the protective cover 3-10. The two fastening cylinders 3-12 whose ends are connected to the fixing ears 3-13 are fixed on the two cylinder grooves 3-11, and the cylinder grooves 3-11 are fixed on the protective cover 3-10. The two motor driving gears 3-1 at the center of the motor fixing plate 3-7 are connected to the motor 3-6, and the two motor driving gears 3-1 are meshed with the composite external meshing gear 3-2, and the composite external meshing gear 3-2 is fitted with the special bearing 3-3, and the composite external meshing gear 3-2 is meshed with the sixteen internal meshing gears 3-4, and the internal meshing gears 3-4 are fixed with the sixteen nut positioning heads 3-9, and the right side of the nut positioning head 3-9 is connected with the thirteen rotating shafts 3-8 and the three circular driving motors 3-5;

[0049] The double-acting cylinder 1-5 on the outermost side of the flange gasket mounting module is fixed by the fastening double-acting cylinder groove 1-4, the fastening double-acting cylinder groove 1-4 is fixed on the mounting plate 1-1, the telescopic end of the double-acting cylinder is connected to the lifting ear 1-3, the upper end of the action rod 1-2 is connected to the lifting ear 1-3, the lower end of the action rod 1-2 is connected to the gasket mounting frame 1-6, the gasket mounting frame 1-6 is connected to the mounting plate 1-1, and the pad 1-7 is connected to the gasket mounting frame 1-6;

[0050] A method for quickly installing a pipe flange, applied to a quick installation device for a pipe flange as described above, comprising:

[0051] Acquire attribute information of the flange to be installed, and fix the flange to be installed on the quick installation device of the pipeline flange, wherein the attribute information includes the number of bolts, flange type, predetermined value of bolt preload and target bolt preload;

[0052] Assemble the flange bolt pushing module, flange nut installation module and flange gasket installation module, control the flange gasket installation module to push the flange gasket to be stably installed in the flange plate, and after the cylinder returns to its position, control the flange bolt pushing module to install the bolts to the corresponding bolt hole positions. After the bolts are installed, pre-tighten the flange bolts by controlling the speed of the driving motor of the flange nut installation module;

[0053] In order to ensure that the bolts are aligned parallel to each other during flange installation and that the gasket is fixed at the corresponding position of the flange, the motor in the flange nut installation module is driven to install the bolts with a 30% target preload force, and the first bolt strain data and the first surface temperature of the bolt are recorded in real time through the resistance strain gauge;

[0054] When the bolt strain data reaches 30% of the target preload requirement, the greater the preload when preloading the bolt, the more obvious the elastic interaction between the bolt and the flange connection. Therefore, by slowing down the motor speed and increasing the torque, the bolt is installed with 70% of the target preload, and the second bolt strain data and the second surface temperature of the bolt are recorded in real time through the resistance strain gauge.

[0055] Obtaining a sensitivity correction coefficient of the resistance strain gauge as it changes with temperature;

[0056] Since the bolt will have obvious elastic interaction after reaching 70% of the target preload, the corrected preload is calculated based on the measurement data of the resistance strain gauge, and the bolt is installed with 100% of the target preload based on the corrected preload.

[0057] Further, it is determined whether the corrected preload force meets the installation error range according to the corrected preload force and the target preload force, and the judgment standard is:

[0058]

[0059] F 修正后 =K a EεA

[0060] Among them, F 修正后 is the corrected preload force, F a is the target bolt preload, S is the error value, K a is the sensitivity correction coefficient of the resistance strain gauge, E is the elastic modulus of the bolt; A is the axial cross-sectional area of ​​the bolt, and ε is the bolt strain size.

[0061] If the corrected preload force satisfies the installation error range, the bolt is installed according to the corrected preload force and the target preload force. Specifically:

[0062] When the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is greater than zero, the preload after the bolt is installed with 100% of the target preload is increased;

[0063] When the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is less than zero, the preload after the bolt is installed with 100% of the target preload is reduced.

[0064] In the implementation mode, Figure 6-Figure 7 , a method for quickly installing a pipe flange, the specific steps are as follows:

[0065] S1. Preparation stage

[0066] S11. According to the specific model of the flange, including the number of bolts, flange type, and the predetermined value of the bolt preload, the matching module model is used to determine the target bolt preload of the flange as F. a ;

[0067] S12. Assemble the flange bolt push module, install the bolt plate, and fix the large cylinder through four arc-shaped fixing plates, fixing parts and a protective shell to achieve the fixation of the overall structure of the module; the cylinder is fixed through a fastening groove and a fixing plate, and connected to the push rod to achieve the installation function of the flange bolt.

[0068] S13. Assemble the flange nut installation module, install the fixing nut positioning joint, and fix the cylinder through the cylinder groove and the protective cover to achieve the fixation of the overall structure of the module; the motor and the circular drive motor are fixed through the motor fixing plate, and the motor driving gear, the compound external meshing gear, the special bearing, and the external meshing gear are rotated to achieve the installation function of the flange nut.

[0069] S14, assemble the flange gasket installation module, install and fix the gasket installation plate, fix the double-acting cylinder by tightening the double-acting cylinder groove and the gasket, push the action rod, the lifting ear and the gasket mounting frame to realize the installation function of the flange gasket;

[0070] S2. Installation phase

[0071] S2. Installation phase

[0072] S21, after the flange bolt pushing module and the flange gasket installation module have completed the installation of the flange bolts and the flange gaskets, the flange bolt pushing module starts to work, and after the bolts are installed to the corresponding bolt hole positions, the bolt strain data ε is started to be recorded;

[0073] S22. To ensure that the bolts are aligned parallel to each other during flange installation and that the gasket is fixed at the corresponding position of the flange, the bolts are installed with a 30% target preload force through the flange nut installation module. The resistance strain gauge records the bolt strain data ε and the surface temperature x of the bolt in real time. The motor speed V during installation 1 The relationship with strain ε is:

[0074]

[0075] Where E is the elastic modulus of the bolt; A is the axial cross-sectional area of ​​the bolt. When the bolt strain data ε determines that it reaches the strain requirement of 30% of the target preload, proceed to the next step;

[0076] S23. Since the bolt will have obvious elastic interaction after reaching 70% of the target preload, the resistance strain gauge is used to transmit a signal to the motor for slow driving to reduce the influence of the elastic interaction. The bolt is installed with 70% of the target preload, so the motor speed V 2 The relationship with strain ε is:

[0077]

[0078] The resistance strain gauge records the bolt strain data ε and the surface temperature x of the bolt in real time. When the bolt strain data ε is determined to reach 70% of the target preload requirement, the next step is entered;

[0079] S3: Precision processing of preload force

[0080] S31, the sensitive grid element is the main detection element in the resistance strain gauge. The resistance value of the sensitive grid material changes to detect the bolt surface strain. The resistance value of the sensitive grid changes due to the temperature increase, which affects the detection of the bolt preload. In order to reduce the influence of temperature in the resistance strain gauge and improve the detection accuracy of the bolt preload, the prediction correction curve method is used to fit the temperature data x and strain data ε obtained during data collection to obtain the sensitive correction coefficient K a .

[0081] S32, based on the sensitivity correction coefficient K of the resistance strain gauge a , install the bolts with 100% target preload force to achieve full preload of the flange nuts, where the motor speed V 3 The relationship with strain ε is:

[0082]

[0083] S4: Preload force error range analysis stage

[0084] S41. According to the precise test results, error analysis is performed to determine whether the precise bolt preload can reach the error range to ensure the uniformity of the bolt preload distribution of the flange. The judgment criteria are:

[0085]

[0086] S42: If the error does not meet the requirement, it indicates that the motor pre-tightening process in step S32 has a deviation due to excessive pre-tightening force, and the motor speed V3 is corrected:

[0087]

[0088] Where ΔV 电机As the speed change of the motor, if its error meets the requirement, an end signal is transmitted to the motor to end its working state and cut off the power. After the device is installed, it is disassembled and stored;

[0089] Furthermore, in step S42, according to the formula K=FF a If K<0, the motor rotates forward and continues to increase the bolt preload. If K>0, the motor rotates reversely to reduce the bolt preload. The preload is large during preload, and the fatigue life of the bolt needs to be considered. The speed change of the motor ΔV 电机 :

[0090]

[0091] Where N is the fatigue life of the bolt under the target preload.

[0092] Furthermore, K in step S32 a The analysis process of the sensitivity correction coefficient is as follows: According to a large amount of data on the "false strain" of the resistance strain gauge, it is related to the size of the sensitive grid inside the strain gauge and the size of the measured part. The reasoning process is as follows. The displacement of one end of the sensitive grid is dy, and the formula is obtained:

[0093]

[0094] Where τ(x,y) is the shear strain in the y direction at temperature x. The formula is obtained by differential principle:

[0095]

[0096] Consider the axial deformation as:

[0097]

[0098] Substituting the axial deformation function △u(x,y) into the equation, we can get:

[0099]

[0100] By integrating △udε, we can get the sensitivity correction coefficient K which changes with temperature. a :

[0101]

[0102] where t g —Sensitive grid thickness, W g —Sensitive gate width, E g — Elastic modulus of sensitive grid, x— Temperature, W m — Width of the detection part, t m —Thickness of the testing part, E m—Elastic modulus of the test part;

[0103] Furthermore, the data transmission process in step S42 is performed according to the formula K=FF. a If K<0, the motor rotates forward and continues to increase the bolt preload. If K>0, the motor rotates reversely and reduces the bolt preload. The motor speed change ΔV 电机 :

[0104]

[0105] Where N is the fatigue life of the bolt under the target preload.

[0106] Example:

[0107] Under the working environment of 21℃, the elastic modulus of the bolts of the ordinary sixteen-bolt flange is E=200GPa, the diameter of the bolt is d=38.1mm, and the applied bolt preload is F a =508650N, after the flange is installed, the average strain value ε is detected by ordinary resistance strain gauge = 2.0651mm. Sensitive grid thickness t g =5μm, sensitive gate width W g =24.5μm, elastic modulus of sensitive grid E g =190GPa, detection area width W m =0.06mm, thickness of the testing part t m =0.05mm, after pre-tightening the bolt, the surface temperature of the bolt rises from 21℃ to 22.5℃, and an analysis is made on this situation.

[0108] Method 1: Use the traditional method to solve the problem. First, find the cross-sectional area of ​​the bolt:

[0109]

[0110] Then calculate the bolt preload F:

[0111] F=EεS=470842N

[0112] Finally, find the error:

[0113]

[0114] Method 2: Use the patented correction method to solve the problem. First, calculate the sensitivity correction coefficient K. a :

[0115]

[0116] The sensitivity correction factor K a Substitute into the formula to get the new F

[0117] F=K a ΕεS≈508193N

[0118] Finally, find the new error:

[0119]

[0120] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A quick installation device for a pipe flange, characterized in that: include: Flange gasket installation module, flange bolt push module, flange nut installation module, resistance strain gauge; The flange bolt pushing module is arranged at the left end of the flange to be installed, the flange nut mounting module is arranged at the right end of the flange to be installed, the flange gasket mounting module is arranged on the outside of the flange nut mounting module, and the resistance strain gauge is arranged on the bolt surface of the flange, characterized in that: The flange bolt pushing module includes a pushing rod, a cylinder, a fastening groove, a fixing plate, a bolt plate, an arc-shaped fixing plate, a large cylinder, a fixing part, and a protective shell; The flange nut installation module includes a motor driving gear, a composite external gear, a special bearing, an internal gear, a circular drive motor, a motor, a rotating shaft, a motor fixing plate, a nut positioning joint, a cylinder groove, a fastening cylinder, a protective cover, and a fixing ear; The flange gasket installation module comprises a gasket installation plate, an action rod, a lifting ear, a fastening double-acting cylinder groove, a double-acting cylinder, a gasket installation frame, and a gasket plate.

2. A quick installation device for a pipe flange according to claim 1, characterized in that: The bolt plate at the center of the flange bolt push module is spliced ​​in half, and its outer side is the protective shell. The two cylinders and the two fastening grooves on the outer side of the protective shell are fixed by four arc-shaped fixing plates, and their positions are symmetrically installed. The telescopic ends of the two cylinders are connected to the two push rods, and the telescopic ends of the two fastening cylinders installed on the fastening grooves are connected to the two fixing parts.

3. A quick installation device for a pipe flange according to claim 1, characterized in that: The two motors are fixed at the right ends of the two outermost fixing plates in the flange nut mounting module, and their positions are symmetrical and both are fixed on the protective cover. The two fastening cylinders are fixed on the two cylinder grooves, and the cylinder grooves are fixed on the protective cover. The two motor driving gears at the center of the fixing plate are connected to the motor, and the two motor driving gears are meshed with the compound external meshing gears, and the compound external meshing gears are fitted with the special bearings, and the compound external meshing gears are meshed with the sixteen external meshing gears, and the external meshing gears are fixed to the sixteen nut locating heads, and the right side of the nut locating head is connected to the thirteen rotating shafts and the three circular drive motors.

4. A quick installation device for a pipe flange according to claim 1, characterized in that: The double-acting cylinder at the outermost side of the flange gasket mounting module is fixed by the fastening double-acting cylinder groove, and the fastening double-acting cylinder groove is fixed on the mounting plate. The telescopic end of the double-acting cylinder is connected to the lifting ear, the upper end of the acting rod is connected to the lifting ear, the lower end of the acting rod is connected to the gasket mounting frame, the gasket mounting frame is connected to the mounting plate, and the gasket plate located at the lower end of the gasket mounting frame is connected to the gasket mounting frame.

5. The quick installation device for pipeline flange according to claim 1, characterized in that: The installed flange is arranged on the left side of the quick installation device of the pipeline flange, and is the flange after installation. The resistance strain gauge is arranged on the surface of each bolt.

6. A method for rapid installation of a pipe flange, applied to a rapid installation device for a pipe flange as claimed in claims 1 to 4, characterized in that: include: Acquire attribute information of the flange to be installed, and fix the flange to be installed on the quick installation device of the pipeline flange, wherein the attribute information includes the number of bolts, flange type, predetermined value of bolt preload and target bolt preload; Assemble the flange bolt pushing module, flange nut installation module and flange gasket installation module, control the flange gasket installation module to push the flange gasket to be stably installed in the flange plate, and after the cylinder returns to its position, control the flange bolt pushing module to install the bolts to the corresponding bolt hole positions. After the bolts are installed, pre-tighten the flange bolts by controlling the speed of the driving motor of the flange nut installation module; In order to ensure that the bolts are aligned parallel to each other during flange installation and that the gasket is fixed at the corresponding position of the flange, the motor in the flange nut installation module is driven to install the bolts with a 30% target preload force, and the first bolt strain data and the first surface temperature of the bolt are recorded in real time through the resistance strain gauge; When the bolt strain data reaches 30% of the target preload requirement, the greater the preload when preloading the bolt, the more obvious the elastic interaction between the bolt and the flange connection. Therefore, by slowing down the motor speed and increasing the torque, the bolt is installed with 70% of the target preload, and the second bolt strain data and the second surface temperature of the bolt are recorded in real time through the resistance strain gauge. Obtaining a sensitivity correction coefficient of the resistance strain gauge as it changes with temperature; Since the bolt will have obvious elastic interaction after reaching 70% of the target preload, the corrected preload is calculated based on the measurement data of the resistance strain gauge, and the bolt is installed with 100% of the target preload based on the corrected preload.

7. A quick installation method for a pipe flange according to claim 6, characterized in that: The method further comprises: According to the corrected preload force and the target preload force, it is judged whether the corrected preload force meets the installation error range, and the judgment standard is: F 修正后 =K a EεA where F 修正后 is the corrected preload force, F a is the target bolt preload, S is the error value, K a is the sensitivity correction coefficient of the resistance strain gauge, E is the elastic modulus of the bolt; A is the axial cross-sectional area of ​​the bolt, and ε is the strain size of the bolt.

8. A method for rapid installation of a pipe flange according to claim 7, characterized in that: The method further comprises: If the corrected preload force satisfies the installation error range, the bolt is installed according to the corrected preload force and the target preload force. Specifically: When the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is greater than zero, the preload after the bolt is installed with 100% of the target preload is increased; When the corrected preload is used as the minuend and the target preload is used as the subtrahend, and the difference between the corrected preload and the target preload is less than zero, the preload after the bolt is installed with 100% of the target preload is reduced.

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