Pipeline crack diffusion testing device
By designing a test device for simulating the diffusion of pipeline cracks, the safety hazards and high cost problems in the prior art are solved, and safe and low-cost pipeline crack detection is achieved, which is suitable for research rooms and product quality management.
Patent Information
- Application Number
- CN202323002598.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2033-11-07
AI Technical Summary
The existing pipeline crack detection technology has safety risks and high testing costs, making it difficult to use in research rooms or product quality management.
A pipeline crack diffusion test device is designed, using impact blades to simulate crack diffusion, detect the impact speed through a speed measuring sensor, combine the elastic tube and the pressure holding device to maintain the internal pressure, and the temperature control device adjusts the temperature to achieve safe and low-cost testing.
The device ensures the safety and low cost of the test by simulating crack diffusion. It is suitable for research rooms and product quality management testing, and can accurately detect the crack diffusion speed of the pipeline and the safe areas under different conditions.
Smart Images
Figure CN222212520U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a pipeline testing device, in particular to a pipeline crack diffusion testing device. Background Art
[0002] Polyethylene pipes are usually used for gas or liquid transportation. When polyethylene pipes are subjected to external impact under high pressure and low temperature, cracks will grow rapidly (RCP: Rapid Crack Propagation), and the crack length can reach hundreds of meters. Therefore, it is necessary to detect the failure of the pipeline, and only those that pass the test and meet the requirements can be sold.
[0003] In the prior art, gas explosion is mainly used for detection, such as a measurement and testing system for dynamic strain and crack extension of a pipeline under gas detonation disclosed in CN115575265A, which includes three parts: a data acquisition component, a detonation pipeline and its supporting component, and an ignition and gas supply component; the data acquisition component includes a high-speed camera and a processor, and the high-speed camera is used to record the process of explosion crack extension of the pipeline; the processor is electrically connected to the high-speed camera, the ignition and gas supply component, and is used to control the occurrence of ignition and the shooting of the high-speed camera, and to process the data shot by the high-speed camera to obtain the full-field strain of the test pipeline surface and the evolution law of the crack tip strain field during the high-speed crack extension process; the detonation pipeline and its supporting component include a detonation pipeline, a base, and a Shchelkin spiral, the detonation pipeline is fixedly installed on the base, and the Shchelkin spiral is placed at one end of the detonation pipeline close to the ignition; the ignition and gas supply component is used to provide a fire source to the detonation pipeline and pass the combustible gas into the detonation pipeline.
[0004] The above system performs detection through explosion, but this system has potential safety hazards, requires a large investment in each test, and is expensive, making it difficult to use as a quality management test for a laboratory or a product. Utility Model Content
[0005] In order to solve the above problems of potential safety hazards, high testing costs, and difficulty in using as a quality management test for research laboratories or products, the utility model provides a pipeline crack propagation test device, and the specific technical solution is as follows:
[0006] A pipeline crack diffusion test device, comprising: a frame; a holding plate, arranged below the top of the frame; at least two guide rods, arranged on the frame; a lifting plate, slidably arranged on the guide rod and located below the holding plate; an impact blade, arranged on the lifting plate, with an impact blade head at one end and a holding rod at the other end; a locking device, arranged on the holding plate, used to lock the holding rod; a releasing device, arranged on the top of the frame and arranged opposite to the locking device, used to open the locking device and release the impact blade; a speed sensor, arranged on the frame, used to detect the speed of the impact blade when it hits the test pipe; and a lifting device, arranged on the frame, arranged opposite to the lifting plate, used to lift the lifting plate so that the holding rod is inserted into the locking device;
[0007] Wherein, the test pipe is arranged at the bottom of the frame and is arranged opposite to the impact blade.
[0008] Preferably, the locking device includes: a locking plate, which is rotatably arranged on the retaining plate and is symmetrically provided with two of them, and the locking plates are also respectively provided with a release groove arranged opposite to the release device and a locking groove arranged opposite to the retaining rod; and a locking tension spring, whose two ends are respectively fixed on the two locking plates, so as to clamp the retaining rod in the locking groove.
[0009] Preferably, the release device comprises: a release cylinder, which is arranged on the frame; and a release cone head, which is arranged on the release cylinder and is arranged opposite to the release groove, and is used to open the locking plate to release the retaining rod.
[0010] Preferably, it further comprises: an impact baffle, which is arranged above the bottom of the frame and is provided with an impact hole opposite to the impact blade.
[0011] Furthermore, it also includes: a plurality of buffer columns, which are arranged on the top of the impact partition and are arranged opposite to the lifting plate.
[0012] Preferably, it also includes: a counterweight plate, which is arranged on the lifting plate.
[0013] Preferably, it further comprises: a speed increasing device, which is arranged on the frame and opposite to the lifting plate, and is used to increase the initial speed of the impact blade.
[0014] Furthermore, the speed increasing device includes: a speed regulating sleeve, which is threadedly arranged on the top of the frame; an speed increasing rod, which is movably arranged on the speed regulating sleeve and is arranged opposite to the top of the lifting plate; and an speed increasing spring, which is movably inserted on the speed increasing rod and is respectively connected to the speed regulating sleeve and the speed increasing rod, and the speed regulating sleeve is used to adjust the elastic force of the speed increasing spring.
[0015] Preferably, it also includes: an elastic tube, which is arranged inside the test pipe and is used to keep the inside of the test pipe at a required pressure; and a pressure-maintaining device, which is connected to the elastic tube and is used to keep the pressure of the elastic tube.
[0016] Preferably, it also includes: a temperature control device, which is used to keep the interior of the rack at a set temperature.
[0017] Compared with the prior art, the utility model has the following beneficial effects:
[0018] The utility model provides a pipeline crack diffusion test device which simulates crack diffusion of the pipeline by impacting the test pipeline with an impact blade, thereby ensuring safety and having low test cost, and can be used as a quality management test for a laboratory or a product. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the structure of this application;
[0020] Figure 2 is a schematic diagram of the structure of the locking device;
[0021] Figure 3 It is the schematic diagram of crack propagation test;
[0022] Figure 4 It is a schematic diagram of a velocity measuring pipeline provided with an impact groove and a conductive paint strip;
[0023] Figure 5 It is a cross-sectional view of the test pipe during testing;
[0024] Figure 6 is a plot of crack propagation versus time;
[0025] Figure 7 It is to test the critical internal pressure of the pipeline at different temperatures or the critical temperature at different internal pressures;
[0026] Figure 8 It is to test the safe area and dangerous area of the pipeline in the internal pressure and temperature gauge. DETAILED DESCRIPTION
[0027] The utility model is now further described with reference to the accompanying drawings.
[0028] like Figure 1 and Figure 2As shown, a pipeline crack diffusion test device includes: a frame 10, a retaining plate 12, a guide rod 14, a lifting plate 31, an impact blade 2, a locking device, a releasing device, a speed sensor 6, a lifting device and an impact partition 11. The top of the frame 10 is provided with a top plate, and the bottom is provided with a bottom plate. The retaining plate 12 is fixed to the top of the frame 10 and is located below the top plate. The impact partition 11 is fixed to the bottom of the frame 10 and is located above the bottom plate. The space between the impact partition 11 and the bottom plate is used to place the test pipe 7. Two guide rods 14 are symmetrically provided, and the two ends are respectively connected to the impact partition 11 and the top plate. The lifting plate 31 is slidably inserted on the guide rod 14 through a linear bearing, and is located between the retaining plate 12 and the impact partition 11. An impact blade 2 is mounted on the lifting plate 31, one end of the impact blade 2 is provided with an impact cutter head 21, the impact cutter head 21 is a conical cutter head, the other end of the impact blade 2 is provided with a retaining rod 22, the retaining rod 22 is provided with a retaining groove 23, and the top plate of the retaining rod 22 is conical; a locking device is mounted on the top of the retaining plate 12, and is used to lock on the retaining groove 23 of the retaining rod 22, so that the impact blade 2 is located directly above the test pipe 7; a releasing device is mounted on the top plate of the frame 10, and is arranged opposite to the locking device, and is used to open the locking device to release the impact blade 2; a speed sensor 6 is mounted on the frame 10, and is located above the impact partition 11, and is used to detect the speed of the impact blade 2 when it hits the test pipe 7; a lifting device is mounted on the frame 10, and is arranged opposite to the lifting plate 31, and is used to lift the lifting plate 31 so that the retaining rod 22 is inserted into the locking device; wherein, the test pipe 7 is arranged at the bottom of the frame 10, and is arranged opposite to the impact blade 2.
[0029] The speed sensor 6 detects the speed of the impact blade and calculates the impact force.
[0030] The impact baffle 11 is provided with an impact hole opposite to the impact blade 2, so that the impact blade 2 can pass through the impact baffle 11 and impact the test pipe 7. A plurality of buffer columns 18 are also installed on the top of the impact baffle 11. The buffer columns 18 are made of rubber or polyurethane and have good elasticity. The buffer columns 18 are arranged opposite to the lifting plate 31 to achieve impact buffering.
[0031] The lifting device is not shown in the figure, and the lifting device includes a motor, a chain, a driven sprocket, a driving sprocket and a lifting seat. The motor is fixed on the top plate of the frame 10 and is equipped with a driving chain. The driven sprocket is installed on the top of the impact partition 11 through a bearing seat. The chains are respectively sleeved on the driving sprocket and the driven sprocket. The lifting seat is fixed on the chain and is located below the lifting plate 31. When the motor rotates forward, the lifting seat abuts against the bottom of the lifting plate 31, driving the lifting plate 31 to rise until the retaining rod 22 is inserted into the locking device, and then the motor reverses to make the lifting seat drop to the top of the impact partition 11 and be located below the buffer column 18, which is convenient for the free fall of the lifting plate 31.
[0032] The locking device includes a locking plate 42 and a locking spring. One end of the locking plate 42 is rotatably mounted on the retaining plate 12, and two locking plates 42 are symmetrically provided. The locking plates 42 are also provided with a release groove 422 and a locking groove 421, respectively. The release groove 422 is located at the other end of the locking plate 42, and the locking groove 421 is located at the center position of the locking plate 42. The two ends of the locking tension spring 44 are respectively fixed to the two locking plates 42 through connecting columns. The locking tension spring 44 is used to lock the retaining rod 22 in the locking groove 421.
[0033] The releasing device includes a releasing cylinder 41 and a releasing cone head 411. The releasing cylinder 41 is fixed on the top plate of the frame 10. The releasing cone head 411 is installed at the end of the piston rod of the releasing cylinder 41 and is arranged opposite to the releasing groove 422. The releasing cylinder 41 pushes the releasing cone head 411 to be inserted into the releasing groove 422. The releasing cone head 411 opens the locking plate 42, and the locking groove 421 leaves the retaining groove 23, releasing the impact blade 2, and the impact blade 2 and the lifting plate 31 perform free fall motion.
[0034] In order to ensure the impact force, a counterweight plate 32 is also included. The counterweight plate 32 is an annular plate. The counterweight plate 32 is installed on the top of the lifting plate 31 so that the impact blade 2 reaches a set weight, which facilitates the processing of the impact blade 2.
[0035] In order to increase the initial velocity of the impact blade 2, an increasing device is also included. The increasing device is installed on the frame 10 and is arranged opposite to the lifting plate 31, which is used to increase the initial velocity of the impact blade 2. The increasing device includes a speed regulating sleeve 52, an increasing rod 51 and an increasing spring. The speed regulating sleeve 52 is installed on the top plate at the top of the frame 10 through threads, and the height can be adjusted up and down. The increasing rod 51 is movably arranged on the speed regulating sleeve 52 and is arranged opposite to the top of the lifting plate 31; the increasing spring is movably inserted on the increasing rod 51 and is respectively connected to the speed regulating sleeve 52 and the increasing rod 51. The speed regulating sleeve 52 is used to adjust the elastic force of the increasing spring, thereby realizing the adjustment of the initial velocity of the impact blade 2.
[0036] It also includes an elastic tube 8 and a pressure-maintaining device. The elastic tube 8 is installed inside the test pipe 7 to keep the required pressure inside the test pipe 7; the pressure-maintaining device is connected to the elastic tube 8 to keep the pressure in the elastic tube 8. The elastic tube 8 can be a rubber tube. The rubber tube is pressurized, and even if cracks occur in the pipeline, the resistance to rapid crack growth can be measured without losing the internal pressure of the pipeline. The pressure-maintaining device is a high-pressure gas source, which inflates the rubber tube until the set pressure is reached inside the rubber tube.
[0037] In order to further verify the measurement results at different temperatures, a temperature control device is also included, which is installed on the rack 10 and is used to keep the inside of the rack 10 at a set temperature. An insulation layer may be installed on the rack 10. The temperature control device includes a heating pipe, a refrigeration system, and a fan to achieve high and low temperature regulation.
[0038] The test pipe 7 is clamped by a clamp, and the clamp is installed on the bottom plate of the frame 10. The test pipe 7 is provided with an impact groove 71 matching the impact cutter head 21. The clamp adopts a V-shaped block, and two V-shaped blocks are combined to clamp the test pipe 7, which can provide reliable clamping and ensure that the impact groove 71 is coaxial with the impact cutter head 21.
[0039] like Figures 3 to 8 As shown, a plurality of conductive paint strips 9 are provided on the test pipe 7. The conductive paint strips 9 are perpendicular to the axial direction of the test pipe 7, and a plurality of conductive paint strips 9 are provided along the axial direction. Both ends of the conductive paint strips 9 are connected to the detection equipment through joints. The detection equipment is used to pass voltage and realize the fracture detection of the conductive paint strips 9 through current, and then calculate the crack propagation speed according to the distance between the conductive paint strips 9 and the impact groove 71. When the test pipe 7 cracks, the conductive paint strips 9 are also disconnected, resulting in a short circuit in the conductive paint strips 9. As the crack develops, the pre-set plurality of conductive paint strips are interrupted in turn, the interruption time of each conductive paint strip is measured, and the crack propagation speed is calculated using the distance between each conductive paint strip.
[0040] During the test, the motor first drives the lifting seat to rise through the chain, and the lifting seat first abuts against the bottom of the lifting plate 31, and then drives the lifting plate 31 to rise until the retaining rod 22 is inserted into the locking groove 421, and the locking groove 421 is stuck on the retaining groove 23, locking the position of the impact blade 2, and then the motor is reversed to make the lifting seat drop to the top of the impact partition 11 and be located below the buffer column 18. Install the test pipe 7, and make the impact groove of the test pipe 7 face the impact blade 2, and then install the elastic tube 8 into the test pipe 7, and be located on one side of the impact groove, avoiding the impact hammer to prevent damage to the elastic tube 8, connect the elastic tube 8 to the pressure holding device, and inflate the elastic tube 8 to make the elastic tube 8 reach the set pressure. Then start the release cylinder 41, which pushes the release cone head 411 to insert into the release groove 422. The release cone head 411 opens the locking plate 42, and the locking groove 421 leaves the retaining groove 23, releasing the impact blade 2. The impact blade 2 and the lifting plate 31 perform free fall motion until they are inserted into the impact groove of the test pipe 7, and the test pipe 7 starts to spread cracks from the impact groove.
[0041] As the crack develops, several pre-set conductive paints are interrupted in turn, the interruption time of each conductive paint is measured, and the crack growth rate is calculated using the distance between each conductive paint.
[0042] By utilizing the free fall of the impact blade 2, the impact is applied to the outside of the test pipe 7. The speed of the impact blade 2 during the impact can be measured by the speed sensor 6, thereby accurately calculating the impact energy.
[0043] By changing the impact energy, the experiment was conducted to observe the change of the impact energy on the resistance to rapid crack progression. Not only the impact height of the impact blade 2 can be adjusted, but also the initial speed of the free fall of the impact blade 2 can be changed by using the spring installed on the top, thereby changing the impact energy.
[0044] The overall structure is simple, the control is convenient, the test safety is high, and the initial speed can be controlled by the speed increasing spring.
[0045] like Figure 6 As shown, the crack propagation velocity of the test pipe can be obtained through experiments.
[0046] like Figure 7 As shown, the critical internal pressure at different temperatures, or the critical temperature at different internal pressures, can be obtained through experiments.
[0047] like Figure 8 As shown, the safe area and dangerous area in the internal pressure and temperature table can be calculated through experiments.
[0048] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the claims of the present invention.
Claims
1. A pipeline crack propagation test device, It is characterized in that include: Frame (10); A retaining plate (12) is arranged below the top of the frame (10); No less than two guide rods (14) are arranged on the frame (10); A lifting plate (31) is slidably disposed on the guide rod (14) and is located below the retaining plate (12); An impact blade (2) is arranged on the lifting plate (31), one end of which is provided with an impact blade head (21) and the other end of which is provided with a retaining rod (22); A locking device, provided on the retaining plate (12) and used for locking the retaining rod (22); A release device, arranged on the top of the frame (10) and arranged opposite to the locking device, and used for opening the locking device to release the impact blade (2); a speed sensor (6), arranged on the frame (10), for detecting the speed of the impact blade (2) when it impacts the test pipe (7); and a lifting device, disposed on the frame (10) and arranged opposite to the lifting plate (31), and used for lifting the lifting plate (31) so that the retaining rod (22) is inserted into the locking device; Wherein, the test pipe (7) is arranged at the bottom of the frame (10) and is arranged opposite to the impact blade (2).
2. A pipeline crack propagation testing device according to claim 1, It is characterized in that The locking device comprises: a locking plate (42) rotatably disposed on the retaining plate (12), and two locking plates (42) are symmetrically disposed, and a release groove (422) disposed opposite to the release device and a locking groove (421) disposed opposite to the retaining rod (22) are respectively disposed on the locking plate (42); and A locking tension spring (44) has two ends respectively fixed on the two locking plates (42) and is used for the locking groove (421) to clamp the retaining rod (22).
3. A pipeline crack propagation testing device according to claim 2, It is characterized in that The release device comprises: A release cylinder (41) is disposed on the frame (10); and A release cone head (411) is provided on the release cylinder (41) and is arranged opposite to the release groove (422) and is used to open the locking plate (42) and release the retaining rod (22).
4. A pipeline crack propagation testing device according to claim 1, It is characterized in that It also comprises: an impact baffle (11), which is arranged above the bottom of the frame (10) and is provided with an impact hole opposite to the impact blade (2).
5. A pipeline crack propagation testing device according to claim 4, It is characterized in that Also includes: A plurality of buffer columns (18) are arranged on the top of the impact partition plate (11) and are arranged opposite to the lifting plate (31).
6. A pipeline crack propagation testing device according to claim 1, It is characterized in that Also includes: The counterweight plate (32) is arranged on the lifting plate (31).
7. A pipeline crack propagation testing device according to claim 1, It is characterized in that Also includes: A speed increasing device is arranged on the frame (10) and is arranged opposite to the lifting plate (31), and is used to increase the initial speed of the impact blade (2).
8. A pipeline crack propagation testing device according to claim 7, It is characterized in that The speed increasing device comprises: A speed regulating sleeve (52) is arranged on the top of the frame (10) through threads; a speed increasing rod (51) movably disposed on the speed regulating sleeve (52) and arranged opposite to the top of the lifting plate (31); and An increasing speed spring is movably inserted on the increasing speed rod (51) and is respectively connected to the speed regulating sleeve (52) and the increasing speed rod (51); the speed regulating sleeve (52) is used to adjust the elastic force of the increasing speed spring.
9. A pipeline crack propagation testing device according to any one of claims 1 to 8, It is characterized in that Also includes: An elastic tube (8) is arranged inside the test pipe (7) and is used to maintain a required pressure inside the test pipe (7); as well as A pressure-maintaining device is connected to the elastic tube (8) and is used to maintain the pressure of the elastic tube (8).
10. A pipeline crack propagation testing device according to any one of claims 1 to 8, It is characterized in that Also includes: A temperature control device is used to maintain a set temperature inside the rack (10).