PE pipe flange strength test tool

Abstract

The utility model discloses a PE (Poly Ethylene) pipe flange strength test tool, which relates to the technical field of ship construction and comprises a base, a stretching device and a jacking device, the stretching device comprises a left flange joint fixed on the base, a right flange joint which is arranged opposite to the left flange joint left and right and is arranged on the base in a sliding manner, and a sliding driving device for driving the right flange joint to slide left and right; the left flange joint, the PE pipe and the right flange joint define a sealed space; the left flange joint is provided with a water inlet pipe for communicating the airtight space with the outside, and the water inlet pipe is connected with water tightness test equipment; and the jacking device is arranged at the bottom of the PE pipe. The device effectively simulates the stress caused by temperature / hull deformation of the PE pipe in the ship operation process, detects whether the ship pipe leaks or not, and effectively verifies the influence of the vertical arch on the flange strength in the ship operation process, so that construction is carried out in advance, and ship delivery delay caused by later replacement and maintenance is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to shipbuilding technical field, especially a kind of PE pipe flange strength test tool. BACKGROUND

[0002] In recent years, PE pipe is more and more used in large ship ballast system, and such system arrangement has a feature, which is that there is a long straight pipe section along the length of the ship and the main pipe diameter is large. Since PE pipe has large thermal linear expansion coefficient, expansion joint is generally not set, so the stress caused by temperature / ship deformation is absorbed by PE pipe itself, and the stress is large.

[0003] The current PE pipe flange strength test method generally adopts GB / 15820-1995 method, but this method has the following problems: GB / 15820-1995 uses tension meter to conduct pull-out test, which is only suitable for small size PE pipe; the ship ballast main pipe has large size, and the existing test equipment cannot clamp and provide large tension; in addition, the pull-out test equipment cannot conduct water tightness test on the pipe during the test, so it cannot verify whether the ship pipe leaks under the stress. In addition, the vertical arch during ship operation affects the flange strength; the current verification method can only verify the PE pipe flange strength and whether the bolt pre-tightening force meets the use requirement during trial run, if the PE pipe flange strength is not enough or the bolt pre-tightening force is not enough, PE pipe flange plate needs to be replaced or the bolt pre-tightening force needs to be increased on site, which will cause delay in delivery of the ship and affect the efficiency of the shipyard. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of PE pipe flange strength test tool, effectively simulates the situation that PE pipe is under stress caused by temperature / ship deformation during ship operation, detects whether the ship pipe leaks, effectively verifies the influence of vertical arch during ship operation on flange strength, so as to construct in advance and avoid delay in delivery of the ship caused by replacement and maintenance in later period.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model discloses a PE pipe flange strength test frock, including base, set up on the base's tensile device and jacking device, tensile device includes the left flange joint fixed on the base, with the left flange joint left and right opposite setting and the right flange joint of sliding installation on the base and the sliding drive arrangement of driving right flange joint left and right sliding, the PE pipe of one end of the measurement is fixed on the left flange joint, and the other end is fixed on the right flange joint, the left flange joint, PE pipe and right flange joint enclose the airtight space, be provided with the inlet pipe of the communication airtight space with outside on the left flange joint, and the inlet pipe is connected water tightness test equipment, and jacking device sets up at the bottom of PE pipe, is used to with PE pipe up jacking.

[0007] After adopting above-mentioned structure, through the PE pipe of measurement installation to the left flange joint and right flange joint, through sliding drive arrangement drive right flange joint to the right movement, to realize the PE pipe of measurement to stretch, in order to simulate PE pipe installation to the stress stretch of ship after temperature / ship body deformation, through jacking device from the bottom of PE pipe to PE pipe jacking, to simulate the influence of flange strength because of the middle vertical middle arch of ship after PE pipe installation to the ship, then into the airtight space of left flange joint, PE pipe and right flange joint enclose high pressure water body, detect whether the condition of ship pipe leaks, to the PE pipe flange plate according to test result, replace or increase bolt pretightening force in advance, prevent the secondary rework of PE pipe after installing to the ship, cause the delay of construction period.

[0008] Preferably, the left and right opposite fixed mounting plates are installed on the base; the left flange joint is fixed on the left mounting plate, and the right flange joint is slidably installed on the right mounting plate; one limiting column is arranged on the base at the front and back of the PE pipe, and a sliding rod is fixed between each limiting column and the right mounting plate, the axial direction of the sliding rod is left and right, and the right flange joint is slidably installed on the sliding rod. Through this design, the smooth sliding of the right flange joint can be ensured.

[0009] Preferably, the sliding drive device includes a worm gear elevator and a stepping motor driving the worm gear elevator to operate, and the output shaft of the worm gear elevator is fixed on the right flange joint. Through this design, the sliding distance of the right flange joint can be accurately controlled, so as to control the stretching distance of the PE pipe, so as to make the test data more accurate.

[0010] Preferably, two sliding rods are fixed between each limiting column and the right mounting plate, and the two sliding rods are arranged in parallel. Through this design, the right flange joint can be provided with enough support points, so as to reduce the deformation caused by the stress of a single sliding rod, and the sliding stability of the right flange joint can be ensured.

[0011] Preferably, the jacking device comprises a lifting platform movably mounted on the base and a lifting driving device for driving the lifting platform to move up and down. Through this design, the lifting platform pushes the PE pipe upward from the bottom to bend, thereby simulating the sagging state of the PE pipe.

[0012] Preferably, the lifting platform comprises a V-shaped support frame, and the PE pipe is supported on the front and rear inclined surfaces of the V-shaped support frame. Through this design, the contact area between the PE pipe and the lifting platform can be increased, so that the force acting on the PE pipe is balanced, and deformation of the PE pipe is avoided.

[0013] Preferably, support wheels are rotatably mounted on the front and rear inclined surfaces of the V-shaped support frame, and the support wheels are supported on the bottom of the PE pipe and rotate in the left-right direction. Through this design, the friction between the V-shaped support frame and the PE pipe during the jacking process or the stretching process is avoided, thereby preventing damage to the PE pipe.

[0014] Preferably, two jacking devices are provided, which are respectively located on the left and right sides of the PE pipe. Through this design, the shape of the PE pipe is more stable when simulating the sagging state, the force acting on the PE pipe is more balanced, and damage to the PE pipe caused by uneven force is avoided.

[0015] A method for performing an experiment by using the PE pipe flange strength test tool, S1: calculating the maximum deformation amount AL1 of the PE pipe caused by temperature difference; S2: calculating the maximum deformation amount AL2 of the PE pipe in the length direction of the ship and the sagging amount caused by deformation of the ship body during ship operation; S3: manufacturing a test PE pipe, and clamping the flange of the PE pipe to the stretching device of the PE pipe flange strength test tool; S4: stretching the PE pipe by the stretching device, and the stretching length is AL, wherein AL = AL1 + AL2; S5: jacking the PE pipe by the jacking device, so that the sagging amount of the PE pipe is consistent with the sagging amount calculated in S2; and S6: filling water into the water inlet pipe by the water tightness test equipment to perform a pressure tightness test, and checking whether the PE pipe leaks.

[0016] After the above method is used, the situation that whether the ship pipe leaks can be effectively simulated when the PE pipe bears stress caused by temperature / ship body deformation during ship operation, and the influence of sagging on the flange strength during ship operation is effectively verified, thereby enabling early construction and avoiding delay of delivery caused by later replacement and maintenance.

[0017] Preferably, the calculation formula of the maximum deformation amount AL1 of the PE pipe in S1 is: AL1 = AL * a * L; wherein AL is the maximum temperature difference from the installation of the PE pipe to the use stage according to the temperature in previous years; a is the linear expansion coefficient of the PE pipe; and L is the total length of the PE pipe. Through this design, the deformation amount of the PE pipe caused by temperature can be accurately calculated, thereby making the simulation data more accurate.

[0018] After adopting the above technical solution, the beneficial effects of the utility model are:

[0019] The utility model discloses a PE pipe flange strength test tool that solves the technical problem in the prior art that PE pipes in large ship ballast systems need to be reworked after being assembled on the ship because simulation experiments cannot be carried out in advance, which affects the construction period. The utility model effectively simulates the stress caused by temperature / hull deformation on PE pipes during ship operation to detect whether the ship pipes are leaking. At the same time, it effectively verifies the influence of vertical arch on flange strength during ship operation, thereby enabling construction in advance and avoiding delays in ship delivery caused by later replacement and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural diagram of a PE pipe flange strength test tool of the utility model;

[0021] Figure 2 yes Figure 1 Schematic diagram of the tooling structure without PE pipe assembled;

[0022] Figure 3 yes Figure 1 Side view of;

[0023] Figure 4 It is a structural diagram of the jacking device.

[0024] In the figure, 1. base, 11. limiting column, 2. stretching device, 21. left flange joint, 211. left mounting plate, 22. right flange joint, 221. right mounting plate, 222. slide rod, 23. sliding drive device, 231. worm gear lifter, 232. stepper motor, 3. lifting device, 31. lifting platform, 311. V-shaped support frame, 312. lifting drive device, 313. support wheel, 314, telescopic column, 4. PE pipe, 41. flange plate, 5. water inlet pipe. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings.

[0026] The orientations mentioned in this specification are based on the orientations of the PE pipe flange strength test tool of the present invention during normal operation, and do not limit the orientations during storage and transportation. They only represent relative positional relationships, not absolute positional relationships.

[0027] like Figure 1 、 Figure 2 and Figure 3 As shown together, a PE pipe flange strength test tool includes a base 1, a stretching device 2 and a jacking device 3 arranged on the base 1.

[0028] The stretching device 2 includes a left flange joint 21 fixed to the base 1, a right flange joint 22 arranged opposite to the left flange joint 21 and slidably mounted on the base 1, and a sliding drive device 23 that drives the right flange joint 22 to slide left and right. Flanges 41 are fixed to the left and right ends of the PE pipe 4 to be tested, with one end fixed to the left flange joint 21 and the other end fixed to the right flange joint 22. The flanges 41 are bolted to the left and right flange joints 21 and 22 on the same side. The left flange joint 21, PE pipe, and right flange joint 22 form a closed space.

[0029] The sliding installation method of the right flange joint 22 can be a variety of structures, such as a slide rail is provided on the base 1, and a slider is fixedly installed on the right flange joint 22, and the slider is slidably installed in the slide rail to realize the sliding installation of the right flange joint 22.

[0030] In this embodiment, to facilitate the installation of the left and right flange joints 21 and 22, a left mounting plate 211 and a right mounting plate 221 are fixedly mounted on the base 1 in a relatively fixed manner. To maintain the stability of the device, the four corners of the left and right mounting plates 211 and 221 are connected by connecting rods to form a stable frame structure. The left flange joint 21 is fixed to the left mounting plate 211, and the right flange joint 22 is slidably mounted on the right mounting plate 221. The right mounting plate 221 is slidably mounted as follows: a limit post 11 is provided on the base 1 at the front and rear sides of the PE pipe 4. A slide rod 222 is fixed between each limit post 11 and the right mounting plate 221. The slide rod 222 is axially oriented in the left-right direction. The right flange joint 22 is provided with a sliding hole for the slide rod 222 to pass through. By sleeved on the slide rod 222, the right flange joint 22 is slidably mounted on the slide rod 222.

[0031] In order to make the sliding smoother, a sliding sleeve is installed in the sliding hole; further, in order to achieve better guidance for the sliding of the right flange joint 22, two sliding rods 222 are fixed between each limiting column 11 and the right mounting plate 221 in this embodiment. The two sliding rods 222 are arranged parallel to each other up and down, thereby ensuring that the right flange joint 22 is more stable.

[0032] The sliding driving device 23 can be an electric cylinder or a pneumatic cylinder or an electric push rod. In order to realize accurate control of stretching, the sliding driving device 23 in the embodiment comprises a worm gear elevator 231 and a stepping motor 232 for driving the worm gear elevator 231 to operate. The output shaft of the worm gear elevator 231 is fixed on the right flange joint 22. The worm gear elevator 231 is driven to move by the operation of the stepping motor 232, so as to control the left and right sliding of the right flange joint 22, thereby realizing the stretching of the PE pipe 4. The left flange joint 21 is provided with a water inlet pipe 5 connected with the water-tight test equipment and communicating with the airtight space and the outside.

[0033] The jacking device 3 is arranged at the bottom of the PE pipe 4 and is used for jacking the PE pipe 4 upward. The jacking device 3 comprises a lifting platform 31 movably arranged on the base 1 and located at the bottom of the PE pipe 4 to be tested and a lifting driving device 312 for driving the lifting platform 31 to lift. The lifting driving device 312 can be a hydraulic lifting device. The lifting platform 31 is driven to lift by the lifting driving device 312. The middle part of the PE pipe 4 is driven to rise upward by the lifting of the lifting platform 31, so as to simulate the sagging and camber state of the ship in navigation. In order to make the sagging and camber shape of the PE pipe 4 more stable, the lifting platform 31 is arranged in two in the embodiment, which are respectively located at the left and right sides of the PE pipe 4.

[0034] As shown in Figure 4 The lifting platform 31 comprises a V-shaped support frame 311. The PE pipe 4 is clamped between the front and rear inclined surfaces of the V-shaped support frame 311. The V-shaped support frame 311 is welded by steel pipes.

[0035] In order to avoid the abrasion of the PE pipe 4 caused by the V-shaped support frame 311 during stretching and jacking, support wheels 313 are rotatably arranged on the front and rear inclined surfaces of the V-shaped support frame 311. The support wheels 313 are supported at the bottom of the PE pipe 4 and rotate in the left and right directions.

[0036] In order to make the lifting of the lifting platform 31 more stable, telescopic columns 314 are arranged on the front and rear sides of the V-shaped support frame 311. The fixed ends of the telescopic columns 314 are fixed on the base 1, and the telescopic ends of the telescopic columns 314 are fixed on the V-shaped support frame 311.

[0037] A method for performing experiments by using the PE pipe flange strength test tool, comprising the following steps:

[0038] S1: calculating the maximum deformation amount AL1 of the PE pipe caused by temperature difference;

[0039] Based on the historical temperatures in the shipyard's area, estimate the maximum temperature difference Δt between the PE pipe's installation and its operational stage, and calculate the maximum temperature-induced deformation ΔL1. ΔL1 is calculated as follows: ΔL1 = Δt * α * L, where α is the PE pipe's linear expansion coefficient, which can be found on the PE pipe material certificate. The linear expansion coefficient is the linear expansion of a unit length of PE pipe along its length when the temperature changes by 1°C. The specific value is 1.1 to 1.3 times 10 to the negative fourth power per Kelvin (10^-4 / K). This means that for a 1K (or 1°C) temperature increase, each meter of PE pipe will expand by approximately 0.00011 to 0.00013 meters (or 1.1 to 1.3 microns) due to thermal expansion. L is the total length of the PE pipe.

[0040] S2: Calculate the maximum deformation △L2 and sagging and camber of the PE pipe in the ship's length direction caused by the hull structure during ship operation;

[0041] Through structural finite element analysis (software analysis, analysis software includes PKPM, 3D3S, MTS, MST, Tongji Qimingxing, ETABS, SAP2000, SAFE, PERFORM-3D, MIDAS, STAAD PRO, ROBOT, EASY, FORTEN, ANSYS, ABAQUS, NASTRAN, MARC, LS-DYNA, etc.), the maximum deformation △L2 in the ship length direction caused by the hull structure during the operation of the ship and the maximum structural sagging and camber of the PE pipe are calculated.

[0042] S3: Prepare a PE pipe 4 for testing, and clamp the flange of the PE pipe 4 to the tensile device 2 of the PE pipe flange strength test tool;

[0043] Prepare the PE pipe for the test and assemble the PE pipe 4 with the aforementioned PE pipe flange strength test fixture. Note that the length (L + ΔL1 + ΔL2) should be less than the maximum left-right distance between the left and right flange joints 21 and 22. Bolts are used to secure the flange on one side of the PE pipe 4 to the left flange joint 21, while studs are used to secure the flange on the other side to the right flange joint 22. The PE pipe consists of multiple, butt-jointed pipes. Adjacent pipes are connected by flanges, with sealing rings sandwiched between them.

[0044] S4: The PE tube is stretched by the stretching device 2 to a stretching length of ΔL, where ΔL=ΔL1+ΔL2.

[0045] The right flange joint 22 is driven to slide rightward by the sliding drive device 23 , thereby achieving the stretching of the PE pipe 4 .

[0046] S5: The PE pipe is lifted by the lifting device 3 so that the sagging and cambering amount of the PE pipe is consistent with the sagging and cambering amount calculated in S2.

[0047] Step S6: Fill the water inlet pipe 5 with water through a water tightness test device to perform a pressure tightness test to check whether the PE pipe has any leakage.

[0048] Perform a tightness test on the PE pipe 4 at 1.5 times the design pressure for 1 hour to check whether there is any leakage in the pipeline.

[0049] The utility model discloses a PE pipe flange strength test tool that solves the technical problem in the prior art that PE pipes in large ship ballast systems need to be reworked after being assembled on the ship because simulation experiments cannot be carried out in advance, which affects the construction period. The utility model effectively simulates the stress caused by temperature / hull deformation on PE pipes during ship operation to detect whether the ship pipes are leaking. At the same time, it effectively verifies the influence of vertical arch on flange strength during ship operation, thereby enabling construction in advance and avoiding delays in ship delivery caused by later replacement and maintenance.

[0050] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A PE pipe flange strength test tool, characterized by: It comprises a base, a stretching device and a jacking device arranged on the base; The stretching device includes a left flange joint fixed to the base, a right flange joint arranged opposite to the left flange joint and slidably mounted on the base, and a sliding drive device for driving the right flange joint to slide left and right; one end of the PE pipe to be tested is fixed to the left flange joint, and the other end is fixed to the right flange joint; the left flange joint, the PE pipe, and the right flange joint form a closed space; the left flange joint is provided with a water inlet pipe connecting the closed space with the outside world, and the water inlet pipe is connected to the watertightness test equipment; The lifting device is arranged at the bottom of the PE pipe and is used to lift the PE pipe upward.

2. A PE pipe flange strength test tool according to claim 1, characterized in that: A left mounting plate and a right mounting plate are relatively fixedly installed on the base; the left flange joint is fixed on the left mounting plate, and the right flange joint is slidably installed on the right mounting plate; a limit column is respectively provided on the front and rear sides of the PE pipe on the base, and a sliding rod is fixed between each limit column and the right mounting plate, the axial direction of the sliding rod is left and right, and the right flange joint is slidably installed on the sliding rod.

3. A PE pipe flange strength test tool according to claim 1, characterized in that: The sliding drive device includes a worm gear elevator and a stepping motor for driving the worm gear elevator to operate, and the output shaft of the worm gear elevator is fixed on the right flange joint.

4. A PE pipe flange strength test tool according to claim 2, characterized in that: Two sliding rods are fixed between each of the limiting columns and the right mounting plate, and the two sliding rods are arranged in parallel up and down.

5. The PE pipe flange strength test tool according to claim 1, characterized in that: The lifting device includes a lifting platform installed on the base for moving up and down and a lifting drive device for driving the lifting platform to move up and down.

6. A PE pipe flange strength test tool according to claim 5, characterized in that: The lifting platform includes a V-shaped support frame; the PE pipe is supported on the front and rear inclined surfaces of the V-shaped support frame.

7. A PE pipe flange strength test tool according to claim 6, characterized in that: Support wheels are rotatably mounted on the front and rear inclined surfaces of the V-shaped support frame. The support wheels are supported on the bottom of the PE pipe and rotate in the left and right directions.

8. The PE pipe flange strength test tool according to claim 5, characterized in that: There are two jacking devices, which are respectively located on the left and right sides of the PE pipe.

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