A quick installation device for pipe flanges and method of use

Abstract

The application designs a quick installation device and method of pipeline flange, the device realizes installation and uninstallation of flange gasket and flange bolt through extension and contraction of multiple double-acting cylinders, installation of flange nut is realized by motor driving gear engagement, by controlling motor speed, influence of flange plate surface depression generated during bolt pre-tightening is reduced, mutual influence of pre-tightening force between bolts is reduced, bolt pre-tightening force has the advantage of more uniformity; the method of the application is based on resistance strain effect, reduces "false strain" error of resistance strain gauge caused by temperature change during detection, considers influence of bolt pre-tightening times on bolt pre-tightening, establishes relationship between pre-tightening times and motor speed. Meanwhile, relationship between bolt pre-tightening force and bolt fatigue life and motor speed is established, bolt fracture is prevented, and sealing property of the flange is ensured.

Description

Technical Field

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

[0002] Pipe flanges are easily disassembled connectors widely used in industries like petroleum and chemical engineering. Together with gaskets and nuts, they form a forced seal, connecting various pressure-bearing equipment and forming pipe networks. The nut preload in flange connection systems significantly impacts the system's seal, as well as the stiffness and strength of each component.

[0003] Applying precise and uniform bolt preload not only improves connection reliability, tightness, and component rigidity, but also enhances the bolt's ability to prevent loosening and fatigue resistance. However, if the preload is too high or too low, it can lead to flange sealing failure or bolt loosening, potentially causing leakage. Furthermore, fluctuations in parameters such as medium temperature or pressure during production can cause flange and gasket seal failure, leading to leakage in the connection structure, resulting in resource waste and environmental pollution. Therefore, determining the nut preload for flange connection systems is crucial. However, flange installation presents numerous technical challenges that cannot be ignored. The order in which bolts are preloaded during the preload process can significantly impact flange sealing. In bolted flange connections, since all bolts cannot be loaded simultaneously but rather in a sequential order, subsequent bolts loaded during tightening can cause concave deformation in the flange surface. This concave deformation affects the preload of previously loaded bolts, reducing the load on the preceding bolts. This interaction between bolts can lead to uneven preload on each bolt, seriously compromising flange sealing. The "false strain" caused by the load change when the strain gauge is used to detect the flange preload will be ignored, resulting in the nut preload being too large or too small after installation. Currently, no scholars have discussed how to effectively eliminate the detection error caused by this. Summary of the Invention

[0004] To address these issues, this paper has developed a rapid installation device and method for pipe flanges. This device accurately detects the preload force of flange bolts and accurately applies the preload force. The device's modules are assembled, and then the device is installed and secured to the pipe through the expansion and contraction of a large double-acting cylinder. The flange gasket is installed first, followed by the flange nut, which undergoes data testing. Relying on digital testing, this invention aims to achieve precise installation of pipe flanges while improving work efficiency and ensuring operator safety.

[0005] The technical solutions adopted in the present invention are 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 mounting 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 mounting module includes a gasket mounting plate, an action rod, a lifting lug, a fastening double-acting cylinder groove, a double-acting cylinder, a gasket mounting frame, and a gasket plate;

[0011] Furthermore, the bolt plate at the center of the flange bolt pushing module is spliced ​​in half, with the protective shell on the outside. The two cylinders and the two fastening grooves on the outside 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 pushing rods, and the telescopic ends of the two large cylinders installed on the fastening grooves are connected to the two fixing parts.

[0012] Furthermore, the two motors are fixed on 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. The compound external meshing gears are meshed with the sixteen external meshing gears, and the external meshing gears are fixed to the sixteen nut positioning joints. The right side of the nut positioning joint is connected to the thirteen rotating shafts and the three circular drive motors.

[0013] Furthermore, the double-acting cylinder on 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 bracket, the gasket mounting bracket is connected to the mounting plate, and the pad located at the lower end of the gasket mounting bracket is connected to the gasket mounting bracket;

[0014] Furthermore, 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 the 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 bolt preload value, and target bolt preload force;

[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] To ensure parallel alignment of the bolts during flange installation and that the gasket is fixed in 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. The first bolt strain data and the first surface temperature of the bolt are recorded in real time using a resistance strain gauge.

[0019] When the bolt strain data reaches 30% of the target preload requirement, the greater the preload force during preload, the more significant 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. The second bolt strain data and the second surface temperature of the bolt are recorded in real time using a 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] Furthermore, whether the corrected preload force satisfies the installation error range is determined based on the corrected preload force and the target preload force, and the judgment criteria are:

[0023]

[0024] Where F after correction is the corrected preload force, Fa is the target bolt preload force, S is the error value, Ka 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 ɛ is the bolt strain size;

[0025] Furthermore, 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:

[0026] Furthermore, 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;

[0027] Furthermore, 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.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention provides a rapid installation device and method for a pipe flange, enabling precise installation of pipe flange nuts. Simultaneously, because a motor drives all bolts to pre-tighten in an orderly manner, the concave deformation of the flange surface during bolt pre-tightening can be effectively reduced, reducing the elastic interaction of the bolts, ensuring the uniformity of the bolt pre-tightening force applied by each bolt to meet the flange design requirements, and improving the flange's sealing performance. Considering the "false strain" effect present when strain gauges detect flange pre-tightening force, the present invention sets a sensitivity correction coefficient Ka based on the sensitive grid characteristics within the strain gauge, thereby improving the device's accuracy in stress detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the overall structure of the device of the present invention;

[0031] Figure 2 It is a structural schematic diagram of the device of the present invention during installation into a pipeline;

[0032] Figure 3 This is a partial structural diagram of the flange nut mounting module and the flange gasket mounting module of the device of the present invention;

[0033] Figure 4 A schematic structural diagram of a flange nut mounting module of the device of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the device of the present invention when the flange is pre-tightened;

[0035] Figure 6 is a flow chart of the method of the present invention;

[0036] Figure 7 The overall result flow chart of the method of the present invention is as follows;

[0037] 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 gasket plate 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 drive 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

[0038] In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0039] A rapid installation device and method for pipe flanges accurately detects the preload of flange bolts and accurately applies the preload. The device's modules are assembled, and then installed and secured to the pipe by telescoping a large double-acting cylinder. The flange gasket is installed first, followed by the flange nut, which undergoes data detection. Relying on digital detection, this invention aims to achieve precise installation of pipe flanges while improving work efficiency and ensuring operator safety.

[0040] The technical solutions adopted in the present invention are as follows:

[0041] A quick installation device for pipe flanges, such as Figures 1-5It includes a flange gasket installation module, a flange bolt pushing module, a flange nut installation module, and a resistance strain gauge;

[0042] 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:

[0043] 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;

[0044] The flange nut mounting module includes a motor driving gear 3-1, a compound external gear 3-2, a special bearing 3-3, an internal gear 3-4, a circular drive 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;

[0045] 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;

[0046] The bolt plate 2-5 at the center of the flange bolt pushing 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. Their positions are symmetrically installed. The telescopic ends of the two cylinders 2-2 are connected to the two pushing rods 2-1, and the telescopic ends of the two large cylinders 2-7 installed on the fastening grooves 2-3 are connected to the two fixing parts 2-8.

[0047] 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. The two motor driving gears 3-1 are meshed with the compound external meshing gear 3-2, and the compound external meshing gear 3-2 is fitted with the special bearing 3-3. The compound 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 joints 3-9. The right side of the nut positioning joint 3-9 is connected to the thirteen rotating shafts 3-8 and the three circular drive motors 3-5;

[0048] The outermost double-acting cylinder 1-5 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 bracket 1-6, the gasket mounting bracket 1-6 is connected to the mounting plate 1-1, and the pad 1-7 is connected to the gasket mounting bracket 1-6;

[0049] A method for quickly installing a pipe flange, applied to the aforementioned quick installation device for a pipe flange, comprises:

[0050] 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 bolt preload value, and target bolt preload force;

[0051] 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.

[0052] To ensure parallel alignment of the bolts during flange installation and that the gasket is fixed in 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. The first bolt strain data and the first surface temperature of the bolt are recorded in real time using a resistance strain gauge.

[0053] When the bolt strain data reaches 30% of the target preload requirement, the greater the preload force during preload, the more significant 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. The second bolt strain data and the second surface temperature of the bolt are recorded in real time using a resistance strain gauge.

[0054] Obtaining a sensitivity correction coefficient of the resistance strain gauge as it changes with temperature;

[0055] 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.

[0056] Furthermore, whether the corrected preload force satisfies the installation error range is determined based on the corrected preload force and the target preload force, and the judgment criteria are:

[0057]

[0058] Where F after correction is the corrected preload force, Fa is the target bolt preload force, S is the error value, Ka 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 ɛ is the bolt strain size.

[0059] 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:

[0060] 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;

[0061] 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.

[0062] In the implementation mode, Figures 6-7 , a method for quick installation of pipe flanges, the specific steps are as follows:

[0063] S1. Preparation stage

[0064] S11. Based on the specific model of the flange, including the number of bolts, flange type, and predetermined bolt preload value, a matching module model is used to determine a target bolt preload force Fa for the flange;

[0065] 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 protective shells to achieve the fixation of the overall structure of the module; the cylinder is fixed through the fastening groove and fixing plate and connected to the push rod to achieve the installation function of the flange bolt.

[0066] S13. Assemble the flange nut installation module, install the fixing nut positioning joint, and tighten the cylinder through the cylinder groove and protective cover to fix 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, compound external meshing gear, special bearing, and external meshing gear are rotated to realize the installation function of the flange nut.

[0067] 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, and push the action rod, the lifting lug, and the gasket installation frame to achieve the flange gasket installation function;

[0068] S2. Installation phase

[0069] S2. Installation phase

[0070] S21. After the flange bolt pushing module and the flange gasket installing module have completed the installation of the flange bolts and flange gaskets, the flange bolt pushing module starts working, installs the bolts to the corresponding bolt hole positions, and starts recording the bolt strain data ɛ;

[0071] S22. To ensure parallel alignment of the bolts during flange installation and to ensure that the gasket is fixed in 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 ɛ and the bolt surface temperature x in real time. The relationship between the motor speed V1 and the strain ɛ during installation is:

[0072]

[0073] Where E is the elastic modulus of the bolt; A is the axial cross-sectional area of ​​the bolt. When the bolt strain data ɛ determines that it reaches the strain requirement of 30% of the target preload, proceed to the next step;

[0074] 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 mitigate the influence of the elastic interaction. The bolt is installed with 70% of the target preload. The relationship between the motor speed V2 and the strain ɛ is:

[0075]

[0076] The resistance strain gauge records the bolt strain data ɛ and the bolt surface temperature x in real time. When the bolt strain data ɛ is determined to have reached 70% of the target preload requirement, the next step is entered;

[0077] S3, Pre-tightening Force Precision Processing Stage

[0078] S31. The sensitive grid element, the primary detection element in the resistance strain gauge, detects bolt surface strain through changes in the resistance of the sensitive grid material. Temperature increases cause changes in the resistance of the sensitive grid resistor, affecting the detection of bolt preload. To reduce the influence of temperature on the resistance strain gauge and improve the accuracy of bolt preload detection, a predictive correction curve method is used. The temperature data x and strain data ɛ obtained during data acquisition are used to perform data fitting to obtain the sensitivity correction coefficient Ka.

[0079] S32. Based on the sensitivity correction coefficient Ka of the resistance strain gauge, the bolts are installed with 100% target preload force to achieve full preload of the flange nut. The relationship between the motor speed V3 and the strain ɛ is:

[0080]

[0081] S4. Preload force error range analysis stage

[0082] S41. Based on the refined test results, error analysis is performed to determine whether the refined bolt preload can be within the error range to ensure the uniformity of the bolt preload distribution of the flange. The judgment criteria are:

[0083]

[0084] 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:

[0085]

[0086] The ΔV motor is used as the speed change of the motor. If the error meets the requirements, the end signal is transmitted to the motor to end the working state and cut off the power. After the device is installed, it is disassembled and stored.

[0087] Furthermore, in step S42, according to the formula 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 motor speed change ΔVmotor:

[0088]

[0089] Where N is the fatigue life of the bolt under the target preload.

[0090] Furthermore, the Ka in step S32 is a sensitivity correction coefficient. The analysis process is as follows: it is derived based on a large amount of "false strain" data 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:

[0091]

[0092] in —At temperature x, the shear strain in the y direction is obtained by differential principle:

[0093]

[0094] Considering its axial deformation is:

[0095]

[0096] Substituting the axial deformation function △u(x,y) into the equation, we can obtain:

[0097]

[0098] By integrating △udɛ, we can get the sensitivity correction coefficient Ka that changes with temperature:

[0099]

[0100] Where tg is the thickness of the sensitive grid, Wg is the width of the sensitive grid, Eg is the elastic modulus of the sensitive grid, x is the temperature, Wm is the width of the detection part, tm is the thickness of the detection part, and Em is the elastic modulus of the detection part.

[0101] Furthermore, the data transmission process in step S42 is performed according to the formula If K < 0, the motor rotates forward and continues to increase the bolt preload. If K > 0, the motor rotates reverse and reduces the bolt preload. The motor speed change ΔVmotor:

[0102]

[0103] Where N is the fatigue life of the bolt under the target preload.

[0104] Example:

[0105] Under the working environment of 21℃, the elastic modulus of the bolts of the ordinary 16-bolt flange is E=200GPa, the diameter of the bolt is d=38.1mm, and the applied bolt preload is Fa=508650N. After the flange is installed in the device, the average strain value is detected by the ordinary resistance strain gauge. =2.0651mm. Sensitive grid thickness tg = 5μm, sensitive grid width Wg = 24.5μm, sensitive grid elastic modulus Eg = 190GPa, detection part width Wm = 0.06mm, detection part thickness tm = 0.05mm. After pre-tightening the bolt, the bolt surface temperature rises from 21°C to 22.5°C. An analysis is made on this situation.

[0106] Method 1: Use the traditional method to solve the problem. First, calculate the cross-sectional area of ​​the bolt:

[0107]

[0108] Then calculate the preload force F of the bolt:

[0109]

[0110] Finally, find the error:

[0111]

[0112] Method 2: Use the patented correction method to solve the problem. First, calculate the sensitivity correction coefficient Ka:

[0113]

[0114] Substitute the sensitivity correction coefficient Ka into the formula to get the new F

[0115]

[0116] Finally, find the new error:

[0117]

[0118] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the 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 fall within the scope of protection determined by the claims of the present invention.

Claims

1. A method for rapid installation of a pipe flange, characterized in that: A quick installation device for a pipe flange includes: a flange gasket installation module, a flange bolt pushing module, a flange nut installation module, and a resistance strain gauge; wherein the flange bolt pushing module is arranged at the left end of the flange to be installed, the flange nut installation module is arranged at the right end of the flange to be installed, the flange gasket installation module is arranged outside the flange nut installation module, and the resistance strain gauge is arranged on the bolt surface of the flange; The method comprises: 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 bolt preload value, and target bolt preload force; 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. To ensure parallel alignment of the bolts during flange installation and that the gasket is fixed in 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. The first bolt strain data and the first surface temperature of the bolt are recorded in real time using a resistance strain gauge. When the bolt strain data reaches 30% of the target preload requirement, the greater the preload force during preload, the more significant 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. The second bolt strain data and the second surface temperature of the bolt are recorded in real time using a 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, a 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; According to the corrected preload force and the target preload force, it is determined whether the corrected preload force meets the installation error range, and the judgment standard is: Where F after correction is the corrected preload force, Fa is the target bolt preload force, S is the error value, Ka 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 ɛ is the strain size of the bolt.

2. A method for rapid installation of a pipe flange according to claim 1, 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.

3. The method for rapid installation of a pipe flange according to claim 1, 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 bolt plate in the center of the flange bolt pushing module is spliced ​​in half, and its outer side is the protective shell, and the two cylinders and the two fastening grooves on the outer side of the protective shell are fixed by the four arc-shaped fixing plates, and their positions are symmetrically installed, the telescopic ends of the two cylinders are connected to the two pushing rods, and the telescopic ends of the two large cylinders installed on the fastening grooves are connected to the two fixing parts.

4. The method for rapid installation of a pipe flange according to claim 1, characterized in that: The flange nut mounting module includes a motor driving gear, a compound external meshing gear, a special bearing, an internal meshing 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 two motors are fixed on the right ends of the two outermost fixing plates in the flange nut mounting module. 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. The two motor driving gears are meshed with the compound external meshing gears. The compound external meshing gears are fitted with the special bearings. The compound external meshing gears are meshed with the sixteen external meshing gears. The external meshing gears are fixed to the sixteen nut positioning joints. The right side of the nut positioning joint is connected to the thirteen rotating shafts and the three circular drive motors.

5. The method for rapid installation of a pipe flange according to claim 1, characterized in that: The flange gasket mounting module includes a gasket mounting plate, an action rod, a lifting ear, a fastening double-acting cylinder groove, a double-acting cylinder, a gasket mounting frame, and a gasket plate; the outermost double-acting cylinder 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.

6. The method for rapid installation of a pipe 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.

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