Multi-working-condition simulation device for pressure resistance test of polyethylene pipe

Abstract

The invention relates to a multi-working-condition simulation device for a pressure resistance test of a polyethylene pipe, and relates to the technical field of pipe detection, the multi-working-condition simulation device comprises a constant-temperature box with an adjustable internal temperature, a fixing mechanism for fixing the pipe and a test mechanism for performing the pressure resistance test on the pipe, and the side surface of the constant-temperature box is provided with a box door. The testing mechanism can conduct instantaneous high-pressure pressing and slow pressurization pressing on the pipe, various working condition tests on the pipe are achieved, the testing range of the device is enlarged, the yield is improved, the pipe is clamped and fixed through the fixing mechanism, meanwhile, the gas injection assembly is matched to inject gas into the pipe and the gas cylinder before testing, and the testing efficiency is improved. If a through crack appears on the surface of the pipe, gas in the pipe can be exhausted from the through crack, the pressure sensor is in contact with the inner wall of the inflator, and the buzzer gives an alarm, so that a worker does not need to check in person, meanwhile, whether the through crack appears or not can be judged in the testing process, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of pipe testing technology, and in particular to a multi-condition simulation device for testing the pressure resistance of polyethylene pipes. Background Technology

[0002] After the polyethylene pipes are produced, it is necessary to sample and test the pressure resistance of the polyethylene pipe fittings produced in the same batch to ensure the production quality of the plastic pipes. This operation requires the use of professional pipe pressure testing equipment.

[0003] Patent CN219935504U discloses a pipe pressure resistance testing device. This prior art can quickly clamp and position the pipe by using an upper pressure plate, a lower pressure plate and a return spring, which increases the stability of the pipe pressure resistance testing process. At the same time, the strip-shaped through hole opened at the top of the upper pressure plate allows the pressure applying mechanism and the pressure applying rod to move in parallel and adjust the pressure position on the pipe surface, thereby improving the convenience of the device.

[0004] However, the aforementioned existing technologies have the following technical defects: First, the existing technology uses a pressure bar to apply pressure to the surface of the pipe, which is increased slowly by the pressure bar. However, this simulates a pressure condition during the use of the pipe. The pipe will not only be subjected to slowly increasing pressure, but also to sudden instantaneous high pressure. Moreover, the damage to the pipe caused by the two is completely different. Therefore, the existing technology has a small testing range for pipes.

[0005] Second, during the pressing process, through cracks may appear on the surface of the pipe. These through cracks are difficult for staff to observe with the naked eye during the inspection process. They can only be found by staff to carefully inspect after the inspection is completed. This consumes manpower, increases the workload, and reduces the inspection efficiency. In addition, some small through cracks are difficult to detect and are prone to false detection.

[0006] Therefore, there is still room for improvement on the existing foundation in order to overcome the aforementioned technical shortcomings. Summary of the Invention

[0007] To address the aforementioned problems, this application provides a multi-condition simulation device for pressure resistance testing of polyethylene pipes, employing the following technical solution: This includes a temperature-controlled incubator with an adjustable internal temperature and a door on the side.

[0008] This includes a fixing mechanism for securing the pipes and a testing mechanism for conducting pressure tests on the pipes.

[0009] The testing mechanism includes a mouth-shaped frame vertically set inside a constant temperature chamber. An upper plate and a lower plate are arranged sequentially on the inner side of the mouth-shaped frame. A ring electromagnet is embedded in the center of the upper side of the lower plate. A test head extending to the outside of the mouth-shaped frame and pointing vertically downward is installed in the center of the lower side of the lower plate. The testing mechanism also includes a moving component for moving the mouth-shaped frame.

[0010] The fixing mechanism includes a set of mounting bases symmetrically arranged inside the constant temperature chamber and below the testing mechanism. Rotating tubes are rotatably mounted on the mounting bases, and fixed plates are installed at opposite ends of the rotating tubes. An air cylinder is installed at the end of one of the rotating tubes away from the fixed plate, and a piston adapted to it is installed inside the air cylinder.

[0011] It also includes an air injection component and a regulating component.

[0012] Preferably, a set of telescopic arms is symmetrically installed on the lower side of the orifice frame, extending to the inside of the orifice frame and passing through the lower plate and connecting the upper plate with an electric cylinder. A spring is connected between the lower plate and the bottom surface of the orifice frame, and a pressure sensor is also embedded in the center of the upper side of the lower plate.

[0013] Preferably, the moving component includes a one-way screw rotatably mounted between the inner walls of the constant temperature chamber and above the orifice frame; a motor is mounted on the side of the constant temperature chamber with its drive end connected to one end of the one-way screw; and a threaded seat is provided on the one-way screw that is slidably connected to the inner wall of the constant temperature chamber.

[0014] Preferably, U-shaped plates are installed on both sides of the threaded seat three, and an electric cylinder two, whose telescopic arm end is connected to the U-shaped frame, is installed on the lower side of the U-shaped plates.

[0015] Preferably, a pressure sensor is embedded in the side edge of the piston near the rotating tube, and a spring connects the other side of the piston to the inner wall of the cylinder.

[0016] Preferably, a limiting ring with the same center as the fixed plate is installed on the opposite side of the rotating tube, and a motor connected to the corresponding rotating tube gear is installed on the side of the mounting base away from the air cylinder.

[0017] Preferably, the gas injection assembly includes an air pump installed on the outside of the thermostatic chamber, with a connecting hose installed at the output end of the air pump. The end of the connecting hose extends into the thermostatic chamber, and a rotary joint is installed between the end of the connecting hose and the end of a nearby rotating tube.

[0018] Preferably, the adjustment assembly includes a bidirectional screw 2 rotatably mounted between the inner walls of the constant temperature chamber and located below the mounting base, a motor 3 with its drive end connected to one end of the bidirectional screw 2 mounted on the side of the constant temperature chamber, and a threaded seat 2 connected to the mounting base on the same side on each thread of the bidirectional screw 2.

[0019] Preferably, an observation window is provided on the front side of the constant temperature chamber on the side of the testing mechanism, and a controller is installed on the front side of the constant temperature chamber on the side of the observation window.

[0020] In summary, this application includes at least one of the following beneficial technical effects of a multi-condition simulation device for testing the pressure resistance of polyethylene pipes: I. The testing mechanism set up in this application can use the rising upper plate to stretch the spring one. When the spring one rebounds, its stretching elasticity is used in conjunction with the test head to apply instantaneous high pressure to the pipe. At the same time, the descending lower plate can be used to slowly press the test head to apply pressure to the pipe. This allows for testing of the pipe under various working conditions, and the test results are closer to actual applications. This increases the testing range of the device and improves the yield.

[0021] Second, this application uses a fixing mechanism to clamp and fix the pipe while simultaneously using an air injection component to inject air into the pipe and air cylinder before testing. If a through crack appears on the surface of the pipe during the test, the gas inside the pipe will be discharged through the through crack, causing the pressure sensor to contact the inner wall of the air cylinder and triggering an alarm to alert the staff that the pipe is damaged. This eliminates the need for staff to personally inspect the pipe, reducing their workload. Furthermore, the presence of through cracks can be determined during the test, eliminating the need for post-test inspection, thus optimizing the workflow and increasing work efficiency.

[0022] Third, this testing mechanism can ensure the lateral movement of the test head through a unidirectional screw, while the fixing mechanism can drive the pipe to rotate, changing the upward-facing area of ​​the pipe side. This, combined with the laterally movable test head, enables testing of any position on the pipe, thus improving the testing range. Attached Figure Description

[0023] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a structural diagram of this application.

[0025] Figure 2 This is a schematic diagram of the working state structure of this application.

[0026] Figure 3 This is a schematic diagram of the adjustment component structure of this application.

[0027] Figure 4 This is a schematic diagram of the working state structure of the testing organization in this application.

[0028] Figure 5 This is a schematic diagram of the testing facility structure in this application.

[0029] Figure 6 This is a schematic diagram of the main structure of the testing facility in this application.

[0030] Figure 7 This is a schematic diagram of the fixed mechanism structure of this application.

[0031] Figure 8 This is a cross-sectional view of the fixed mechanism in this application.

[0032] Figure 9 This is a schematic diagram of the working state structure of the supporting mechanism of this application.

[0033] Figure 10 This is a schematic diagram of the supporting structure of this application.

[0034] In the diagram: 1. Constant temperature chamber; 2. Testing mechanism; 201. O-shaped frame; 202. Lower plate; 203. Electric cylinder one; 204. Upper plate; 205. Test head; 206. Spring one; 207. Pressure sensor one; 208. Ring electromagnet; 209. One-way screw; 210. Motor one; 211. Threaded seat three; 212. U-shaped plate; 213. Electric cylinder two; 214. Strip groove; 3. Fixing mechanism; 301. Mounting base; 302. Rotating tube; 303. Fixing plate; 304. Air cylinder; 305. Piston; 306. 307. Spring; 308. Pressure sensor II; 309. Limiting component; 310. Limiting ring; 311. Motor II; 312. Gear; 313. Limiting block; 4. Support mechanism; 401. U-shaped frame; 402. Bidirectional screw I; 403. Threaded seat I; 404. Support base; 405. Motor IV; 5. Slide rod; 6. Slider; 7. Air pump; 8. Connecting hose; 9. Rotary joint; 10. Bidirectional screw II; 11. Motor III; 12. Limiting rod; 13. Threaded seat II; 14. Box door; 15. Observation window; 16. Controller. Detailed Implementation

[0035] The following combination Figure 1 - Figure 10 The embodiments of this application will be described in detail.

[0036] This application discloses a multi-condition simulation device for pressure resistance testing of polyethylene pipes. The testing mechanism can use the rising upper plate to stretch the spring, and when the spring rebounds, its stretching force is used in conjunction with the test head to apply instantaneous high pressure to the pipe. At the same time, the descending lower plate can slowly press the test head to apply pressure to the pipe, thereby realizing multi-condition testing of the pipe, increasing the testing range of the device and improving the yield.

[0037] Example 1: like Figure 1 As shown, the thermostat 1 includes an internal temperature adjustable chamber. The thermostat 1 has a door 14 on its side. The internal temperature of the thermostat 1 is adjustable, so that the pipe can be tested at various temperatures. At the same time, the pipe can be put into and taken out of the thermostat 1 by opening and closing the door 14.

[0038] like Figure 2 and Figure 7As shown, the device includes a fixing mechanism 3 for fixing the pipe and a testing mechanism 2 for testing the pressure resistance of the pipe. The fixing mechanism 3 includes mounting bases 301 symmetrically arranged inside the constant temperature chamber 1. A rotating tube 302 is rotatably mounted on the mounting base 301. Each of the opposite ends of the rotating tube 302 is equipped with a fixing plate 303. The pipe is placed between the two fixing plates 303, and the two fixing plates 303 move closer together by the mounting bases 301 until the pipe is clamped and fixed.

[0039] like Figure 7 and Figure 8 As shown, a limiting ring 309 with the same center as the fixed plate 303 is installed on the opposite side of the rotating tube 302. The limiting ring 309 and the fixed plate 303 are bolted together and the inner diameter is the same as the outer diameter of the tube. As the two mounting seats 301 slowly approach each other, the operator can slightly adjust the two ends of the tube to insert them into the limiting ring 309 on the same side, so that the tube can be aligned with the fixed plate 303. At the same time, the rotating tube 302 on each fixed plate 303 can be slightly inserted into the end of the tube.

[0040] Furthermore, a rubber pad (not shown) is provided on the side of the fixed plate 303 facing each other inside the limiting ring 309, so as to seal the gap between the fixed plate 303 and the end of the pipe when clamping, and the rubber pad can also protect both ends of the pipe.

[0041] like Figure 2 and Figure 7 As shown, it also includes an air injection assembly for injecting air into the pipe and an adjustment assembly for adjusting the spacing of the mounting base 301. The air injection assembly includes an air pump 7 installed on the outside of the constant temperature chamber 1. A connecting hose 8 is installed at the output end of the air pump 7. The end of the connecting hose 8 extends into the constant temperature chamber 1 and a rotary joint 9 is installed between the end of the connecting hose 8 and the end of the adjacent rotating pipe 302. The running air pump 7 injects air into the connecting hose 8, and then enters the clamped pipe through the connected rotating pipe 302. The rotary joint 9 allows the rotating pipe 302 to rotate freely after it is connected to the connecting hose 8, and the connecting hose 8 has sufficient length to ensure that the air pump 7 is always connected to the rotary joint 9 when the mounting base 301 moves.

[0042] like Figure 2 and Figure 3As shown, the adjustment assembly includes a bidirectional screw 10 rotatably mounted between the inner walls of the constant temperature chamber 1 and below the mounting base 301. A motor 3 11 with its drive end connected to one end of the bidirectional screw 10 is mounted on the side of the constant temperature chamber 1. Each thread of the bidirectional screw 10 is provided with a threaded seat 13 connected to the mounting base 301 on the same side. A set of limiting rods 12 symmetrically mounted on the inner wall of the constant temperature chamber 1, passing through the two threaded seats 13 and slidingly connected to them, is installed. The motor 3 11 drives the bidirectional screw 10 to rotate, which in turn drives the two threaded seats 13 to move closer to each other, and vice versa. At the same time, the two threaded seats 13 moving closer to each other can also drive the two fixed plates 303 to move closer to each other to clamp the pipe.

[0043] like Figure 7 and Figure 8 As shown, a transparent air cylinder 304 is installed at the end of one of the rotating tubes 302 away from the fixed plate 303. A piston 305 adapted to it is provided inside the air cylinder 304. When air is continuously injected into the tube, the gas will enter the air cylinder 304 through the other end of the tube and the rotating tube 302 on the same side. After reaching a certain level, the gas will push the piston 305 to move in the opposite direction to the opening of the air cylinder 304.

[0044] like Figure 8 As shown, a pressure sensor 307 is embedded in the side edge of the piston 305 near the rotating tube 302. A spring 306 is connected between the other side of the piston 305 and the inner wall of the air cylinder 304. A set of limiting blocks 312 are symmetrically arranged on the inner wall of the air cylinder 304 on the other side of the piston 305. A vent pipe is installed at the end of the air cylinder 304 away from the cylinder opening. The vent pipe connects the area inside the air cylinder 304 to the outside world in the area to the left of the piston 305. At the same time, the piston 305, which moves in the opposite direction to the cylinder opening of the air cylinder 304, will compress the spring 306 until the piston 305 contacts the limiting block 312 and stops injecting air. During the pressure test, if a through crack appears on the pipe (meaning that a through crack will appear when the pipe is subjected to the corresponding pressure during actual use, causing the conveyed medium inside to flow out; the test is based on whether a through crack appears on the surface of the pipe as the qualified standard), the gas will be discharged from the through crack. The spring 306 rebounds and pushes the piston 305 back to its original position, allowing the pressure sensor 307 to squeeze the inner wall of the air cylinder 304, thereby putting pressure on the pressure sensor 307.

[0045] like Figure 8 As shown, a round rod is installed on the other side of the piston 305. The end of the round rod extends to the outside of the air cylinder 304 and is equipped with a limiting member 308. The limiting member 308 limits the piston 305 when it rebounds and recovers. When the limiting member 308 contacts the air cylinder 304, the pressure sensor 307 is gently pressed on the inner wall of the air cylinder 304, ensuring that the pressure sensor 307 is not subjected to excessive pressure and extending its service life.

[0046] like Figure 7 and Figure 8 As shown, a second motor 310 is installed on the side of the mounting base 301 away from the air cylinder 304. The end of the second motor 310 and the rotating tube 302 on the same side are equipped with meshing gears 311. When the second motor 310 runs, it drives the corresponding rotating tube 302 to rotate through the gears 311, which in turn drives the clamped tube to rotate through the fixed plate 303.

[0047] In summary, open the chamber door 14, place the pipe horizontally between the two fixed plates 303, and drive the bidirectional screw 10 to rotate so that the two threaded seats 13 slowly move closer to each other. During this process, the operator can slightly adjust both ends of the pipe to insert them into the limit rings 309 on the same side, thereby aligning the pipe with the fixed plates 303. At the same time, slightly insert the rotating tube 302 on each fixed plate 303 into the end of the pipe until the two fixed plates 303 clamp the pipe. After that, the operator closes the chamber door 14 and adjusts the temperature inside the constant temperature chamber 1 to the predetermined temperature.

[0048] The operating air pump 7 injects air into the connecting hose 8, and then enters the clamping tube through the connected rotating tube 302. The gas will enter the air cylinder 304 through the other end of the tube and the rotating tube 302 on the same side. After reaching a certain level, it pushes the piston 305 to move in the opposite direction to the opening of the air cylinder 304. The piston 305 moving in the opposite direction to the opening of the air cylinder 304 will compress the spring 306. If a through crack appears on the tube during the pressure test, the gas will be discharged from the through crack. The spring 306 rebounds and pushes the piston 305 back to its original position, so that the pressure sensor 307 squeezes the inner wall of the air cylinder 304, thereby putting pressure on the pressure sensor 307. After the test is completed, the box door 14 is opened and the tube is taken out.

[0049] like Figure 2 and Figure 5 As shown, the testing mechanism 2 includes an orifice frame 201 vertically arranged inside the constant temperature chamber 1. An upper plate 204 and a lower plate 202 are arranged sequentially on the inner side of the orifice frame 201. A strip groove 214 is provided on both sides of the orifice frame 201. A set of vertical rods that penetrate the lower plate 202 and are slidably connected to it are symmetrically arranged in the strip groove 214. The vertical rods ensure that the lower plate 202 can only slide up and down inside the orifice frame 201.

[0050] like Figure 5 As shown, a set of telescopic arms is symmetrically installed on the lower side of the mouth-shaped frame 201, extending to the inside of the mouth-shaped frame 201, passing through the lower plate 202 and connecting to the upper plate 204 via an electric cylinder 203. The upper plate 204 can be moved by extending and retracting the electric cylinder 203. When the electric cylinder 203 extends, it causes the upper plate 204 to rise, and when it retracts, it causes the upper plate 204 to fall.

[0051] like Figure 5 and Figure 6As shown, the upper plate 204 is made of iron, and a ring electromagnet 208 is embedded in the center of the upper side of the lower plate 202. A test head 205 extending to the outside of the orifice frame 201 and pointing vertically downward is installed in the center of the lower side of the lower plate 202. A spring 206 connects the lower plate 202 and the inner bottom surface of the orifice frame 201.

[0052] When instantaneous pressing is required, the annular electromagnet 208 is energized to generate magnetic force, which connects and fixes the upper plate 204 and the lower plate 202. The upward movement of the upper plate 204 will then drive the lower plate 202 and the test head 205 to rise, while simultaneously stretching the spring 206 until the spring force of the spring 206 reaches a predetermined value. After that, the electromagnetic force of the annular electromagnet 208 disappears, and the spring 206 rebounds, causing the lower plate 202 and the test head 205 to descend and instantly impact the pipe.

[0053] When a long-term pressing is required, the electric cylinder 203 shortens, causing the upper plate 204 to press down the lower plate 202 and the test head 205 until the test head 205 presses on the pipe, thus achieving long-term pressing. At the same time, the spring 206 is compressed. When the electric cylinder 203 extends, causing the upper plate 204 to rise, the compressed spring 206 will also cause the lower plate 202 and the test head 205 to return to their original positions.

[0054] Meanwhile, the lower surface of the test head 205 is provided with multiple evenly distributed protrusions, so that during the actual pressing process, there is a gap at the contact point between the test head 205 and the pipe, ensuring that the test head 205 will not completely block the through crack.

[0055] like Figure 6 As shown, a pressure sensor 207 is also embedded in the center of the upper side of the lower plate 202. The pressure sensor 207 can monitor the downward pressure of the upper plate 204 on the lower plate 202 when the electric cylinder 203 is shortened, thereby obtaining the downward pressure on the pipe.

[0056] like Figure 5 As shown, a distance sensor (not shown) is installed on the upper side of the upper plate 204 facing the inner top surface of the orifice frame 201. When the spring 206 is at its normal length, the distance between the upper plate 204 and the inner top surface of the orifice frame 201 is the base distance. In the subsequent rising and falling process of the upper plate 204, the distance sensor can be used to know its moving distance, and the electric cylinder 203 can be used to precisely control the movement of the upper plate 204.

[0057] like Figure 2 and Figure 4As shown, the testing mechanism 2 also includes a moving component for moving the orifice frame 201. The moving component includes a one-way screw 209 rotatably mounted between the inner walls of the constant temperature chamber 1 and above the orifice frame 201. A motor 210 with its drive end connected to one end of the one-way screw 209 is mounted on the side of the constant temperature chamber 1. A threaded seat 211 that is slidably connected to the inner wall of the constant temperature chamber 1 is provided on the one-way screw 209. The one-way screw 209 is driven to rotate by the motor 210, and the rotating one-way screw 209 drives the threaded seat 211 to move on the motor 210.

[0058] like Figure 4 and Figure 5 As shown, U-shaped plates 212 are installed on both sides of the threaded seat 211. Electric cylinder 213, which is connected to the end of the telescopic arm and the orifice frame 201, is installed on the lower side of the U-shaped plate 212. The moving threaded seat 211 drives the orifice frame 201 and the components installed on it to move through the U-shaped plate 212 and the electric cylinder 213. At the same time, the electric cylinder 213 can extend and retract to drive the orifice frame 201 to rise and fall, thereby adjusting the initial height of the orifice frame 201 and the test head 205.

[0059] When replacing the limit ring 309 to handle pipes of different diameters, the initial height of the test head 205 can be adjusted by extending and retracting the electric cylinder 213 to make it contact the pipe.

[0060] like Figure 1 As shown, an observation window 15 is provided on the front side of the constant temperature chamber 1 on one side of the testing mechanism 2. A controller 16 with a display screen is installed on the front side of the constant temperature chamber 1 on one side of the observation window 15. The staff can observe the specific lifting and lowering of the test head 205 through the observation window 15. At the same time, the controller 16 is electrically connected to the electrical components in the device and controls their start and stop. The pressure sensor 207 can send the received pressure to the controller 16 and display it on its display screen.

[0061] A buzzer (not shown) is also installed on the upper side of the constant temperature chamber 1. After the pressure sensor 307 receives pressure, it sends a signal to the controller 16, and the controller 16 controls the buzzer to sound an alarm.

[0062] Furthermore, staff can calculate the elastic force of spring-206 and its subsequent elongation length, thereby controlling the subsequent instantaneous impact pressure.

[0063] In summary, the motor 210 first drives the unidirectional screw 209 to rotate, which in turn causes the threaded seat 211 to move the orifice frame 201 until it reaches the predetermined position. Then, the electric cylinder 213 shortens, causing the orifice frame 201 to descend so that the test head 205 contacts the pipe.

[0064] When a momentary press is made, the annular electromagnet 208 is energized to generate magnetic force, which connects and fixes the upper plate 204 and the lower plate 202. The upward movement of the upper plate 204 can then drive the lower plate 202 and the test head 205 to rise, while simultaneously stretching the spring 206 until the upper plate 204 rises to the predetermined height. After that, the electromagnetic force of the annular electromagnet 208 is deactivated, and the spring 206 rebounds, causing the lower plate 202 and the test head 205 to descend and impact the pipe momentarily.

[0065] During prolonged pressing, the electric cylinder 203 shortens, causing the upper plate 204 to press down the lower plate 202 and the test head 205 until the test head 205 presses onto the pipe, thus achieving prolonged pressing. The pressure sensor 207 can monitor the downward pressure of the upper plate 204 on the lower plate 202 when the electric cylinder 203 shortens, thereby obtaining the downward pressure on the pipe. When the pressure reaches the predetermined value, the electric cylinder 203 stops pressurizing. After the pressing reaches the predetermined time, the electric cylinder 203 extends, causing the upper plate 204 to return to its original position, releasing the pressure of the test head 205 on the pipe, and the test is completed.

[0066] Example 2: Based on Example 1, such as Figure 2 and Figure 9 As shown, a support mechanism 4 is also provided. The support mechanism 4 includes a U-shaped frame 401 located between the test mechanism 2 and the bidirectional screw 10 and connected to the U-shaped plate 212 on one side. A bidirectional screw 402 is rotatably mounted between the inner sides of the U-shaped frame 401. A motor 405 with its drive end connected to one end of the bidirectional screw 402 is mounted on the side of the U-shaped frame 401. The moving U-shaped plate 212 can also drive the U-shaped frame 401 and its components to move. The running motor 405 drives the bidirectional screw 402 to rotate.

[0067] like Figure 9 and Figure 10 As shown, each thread of the bidirectional screw 402 is provided with a threaded seat 403 that is slidably connected to the U-shaped bracket 401. A support seat 404 is installed on the upper side of the threaded seat 403. The upper side of the support seat 404 is an arc shape that matches the outer surface of the pipe. The rotating bidirectional screw 402 drives the two threaded seats 403 to move closer to each other, and vice versa. When they move closer to each other, they drive the two support seats 404 to move closer to each other to support the bottom of the pipe at the pressing position, simulating the pressure resistance of the pipe when it has a support. When the two threaded seats 403 move away from each other, they drive the two support seats 404 to move away from each other to release the support of the pipe, simulating the pressure resistance of the pipe when it has no support.

[0068] like Figure 2 and Figure 9As shown, a set of sliding rods 5 are symmetrically installed on the inner wall of the constant temperature chamber 1 below the U-shaped frame 401. A slider 6 connected to the U-shaped frame 401 is slidably mounted on the sliding rods 5. The moving U-shaped frame 401 can drive the slider 6 to slide on the sliding rods 5. At the same time, the sliding rods 5 and the slider 6 can support the U-shaped frame 401.

[0069] Furthermore, a miniature pressure sensor electrically connected to the controller 16 is installed on the inner wall of the air cylinder 304. It is turned on during the test to monitor the pressure change inside the air cylinder 304 in real time. If the pressure drops within a preset time, a signal is sent to the controller 16, and the controller 16 controls the buzzer to sound an alarm.

[0070] This application also discloses a method for using a multi-condition simulation device for pressure resistance testing of polyethylene pipes, the steps of which are as follows: S1. Place the pipe inside the constant temperature chamber 1 and fix it using the fixing mechanism 3. Specifically, open the chamber door 14 and place the polyethylene pipe horizontally between the two fixing plates 303. The motor 3 11 drives the bidirectional screw 2 10 to rotate, causing the two threaded seats 2 13 to slowly approach each other. During this process, the staff can slightly adjust both ends of the pipe to insert them into the limit rings 309 on the same side, so that the pipe is aligned with the fixing plates 303 until the two fixing plates 303 clamp the pipe. After that, the staff closes the chamber door 14 and adjusts the temperature inside the constant temperature chamber 1 to the predetermined temperature.

[0071] S2. Position adjustment: The pressure resistance position of the pipe is adjusted by rotating the pipe through the fixing mechanism 3 and adjusting the lateral position of the test head 205 in the testing mechanism 2. The operator controls the motor 2 310 through the controller 16 to drive the clamped pipe to rotate, thereby changing the upward area of ​​the pipe. At the same time, the motor 1 210 drives the one-way screw 209 to rotate, which in turn causes the thread seat 3 211 to move the orifice frame 201, thereby changing the lateral position of the test head 205 until the predetermined position is reached. Then, the electric cylinder 213 shortens, causing the orifice frame 201 to descend until the test head 205 contacts the pipe. Pressure resistance testing can be performed on any area of ​​the pipe surface.

[0072] S3. Injecting air into the pipe: Air pump 7 is used to inject air into the pipe while moving the position of piston 305. Specifically, the running air pump 7 injects air into the connecting hose 8, and then enters the clamping pipe through the connected rotating pipe 302. The gas will enter the air cylinder 304 through the other end of the pipe and the rotating pipe 302 on the same side. After reaching a certain level, it pushes piston 305 to move in the opposite direction to the opening of air cylinder 304. The piston 305 moving in the opposite direction to the opening of air cylinder 304 will compress spring 306 until piston 305 is released to limit block 312, and the air injection stops.

[0073] S4. Instantaneous Pressing: The pipe is subjected to instantaneous pressing test using the testing mechanism 2. Specifically, the annular electromagnet 208 is energized to generate magnetic force. The upper plate 204 and the lower plate 202 are connected and fixed through the annular electromagnet 208. The upward movement of the upper plate 204 can drive the lower plate 202 and the test head 205 to rise, while stretching the spring 206 until the upper plate 204 rises to the predetermined height. Then, the annular electromagnet 208 loses its electromagnetic force, and the spring 206 rebounds, causing the lower plate 202 and the test head 205 to fall and subject the pipe to instantaneous high-pressure impact.

[0074] S5. Long-term pressing: The test mechanism 2 applies long-term pressure to the pipe. Specifically, the electric cylinder 203 shortens, causing the upper plate 204 to press down the lower plate 202 and the test head 205 until the test head 205 presses onto the pipe, thus achieving long-term pressing. The pressure sensor 207 can monitor the downward pressure of the upper plate 204 on the lower plate 202 when the electric cylinder 203 shortens, thereby obtaining the downward pressure on the pipe. When the pressure reaches the predetermined value, the electric cylinder 203 stops pressurizing. After the pressing reaches the predetermined time, the electric cylinder 203 extends, causing the upper plate 204 to return to its original position, releasing the pressure of the test head 205 on the pipe, and the test is completed.

[0075] S6. Crack Detection: When a through crack appears in the pipe during the test, the gas inside the pipe will be discharged from the through crack and the spring 306 will rebound to its original position. Specifically, if a through crack appears in the pipe during the pressure test, the gas will be discharged from the through crack, the spring 306 will rebound and push the piston 305 back to its original position, causing the pressure sensor 307 to squeeze the inner wall of the air cylinder 304, thereby causing the pressure sensor 307 to be under pressure and sending a signal to the controller. The controller will control the buzzer to sound an alarm, indicating that the pipe is leaking and is unqualified.

[0076] S7. Remove the pipe. Remove the pipe after the pressure test is completed. Specifically, open the box door 14, hold the pipe with your hand, and drive the bidirectional screw 2 10 in reverse to move the two fixed plates 303 away from each other to release the clamp. Use your hands to take the pipe and take it out of the constant temperature box 1.

[0077] It will be apparent to those skilled in the art that this application is not limited to the details of the exemplary embodiments described above, and that this application can be implemented in other specific forms without departing from the spirit or essential characteristics of this application. Therefore, the embodiments should be considered in all respects as exemplary and not restrictive.

[0078] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A multi-condition simulation device for pressure resistance testing of polyethylene pipes, comprising a constant temperature chamber (1) with adjustable internal temperature, wherein a door (14) is provided on the side of the constant temperature chamber (1), characterized in that: It includes a fixing mechanism (3) for fixing the pipe and a testing mechanism (2) for testing the pressure resistance of the pipe; The testing mechanism (2) includes a mouth-shaped frame (201) vertically arranged inside the constant temperature chamber (1). An upper plate (204) and a lower plate (202) are arranged on the inner side of the mouth-shaped frame (201) in sequence. A ring electromagnet (208) is embedded in the upper center of the lower plate (202). A test head (205) extending to the outside of the mouth-shaped frame (201) and pointing vertically downward is installed in the lower center of the lower plate (202). The testing mechanism (2) also includes a moving component for moving the mouth-shaped frame (201). The fixing mechanism (3) includes a set of mounting bases (301) symmetrically arranged inside the constant temperature chamber (1) and below the testing mechanism (2). A rotating tube (302) is rotatably mounted on the mounting base (301). A fixed plate (303) is installed at each of the opposite ends of the rotating tube (302). An air cylinder (304) is installed at the end of one of the rotating tubes (302) away from the fixed plate (303). A piston (305) adapted to it is provided inside the air cylinder (304). It also includes an air injection component and a regulating component.

2. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: A set of telescopic arms is symmetrically installed on the lower side of the mouth-shaped frame (201), extending to the inside of the mouth-shaped frame (201), passing through the lower plate (202) and connecting to the upper plate (204) with an electric cylinder (203). A spring (206) is connected between the lower plate (202) and the inner bottom surface of the mouth-shaped frame (201). A pressure sensor (207) is also embedded in the center of the upper side of the lower plate (202).

3. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 2, characterized in that: The moving component includes a one-way screw (209) that is rotatably mounted between the inner walls of the constant temperature chamber (1) and above the orifice frame (201). A motor (210) with its drive end connected to one end of the one-way screw (209) is mounted on the side of the constant temperature chamber (1). A threaded seat (211) that is slidably connected to the inner wall of the constant temperature chamber (1) is provided on the one-way screw (209).

4. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 3, characterized in that: Both sides of the threaded seat three (211) are equipped with U-shaped plates (212), and the lower side of the U-shaped plates (212) is equipped with electric cylinder two (213) that connects the end of the telescopic arm to the orifice frame (201).

5. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: A pressure sensor (307) is embedded in the side edge of the piston (305) near the rotating tube (302), and a spring (306) is connected between the other side of the piston (305) and the inner wall of the air cylinder (304).

6. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: A limiting ring (309) with the same center as the fixed plate (303) is installed on the opposite side of the rotating tube (302), and a motor (310) connected to the gear of the corresponding rotating tube (302) is installed on the side of the mounting base (301) away from the air cylinder (304).

7. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: The gas injection assembly includes an air pump (7) installed on the outside of the thermostat (1). The output end of the air pump (7) is equipped with a connecting hose (8). The end of the connecting hose (8) extends into the thermostat (1) and a rotary joint (9) is installed between the end of the hose and the end of the adjacent rotating tube (302).

8. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: The adjustment assembly includes a bidirectional screw two (10) that is rotatably installed between the inner walls of the constant temperature chamber (1) and below the mounting seat (301). A motor three (11) with its drive end connected to one end of the bidirectional screw two (10) is installed on the side of the constant temperature chamber (1). Each thread of the bidirectional screw two (10) is provided with a threaded seat two (13) that is connected to the mounting seat (301) on the same side.

9. The multi-condition simulation device for pressure resistance testing of polyethylene pipes according to claim 1, characterized in that: An observation window (15) is provided on the front side of the constant temperature chamber (1) on the side of the test mechanism (2), and a controller (16) is installed on the front side of the constant temperature chamber (1) on the side of the observation window (15).

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