Device for detecting creep property of thermoplastic plastic pipe

Abstract

The utility model discloses a device for detecting the creep property of a thermoplastic plastic pipe, which comprises an experiment table, a plurality of detection tools are arranged on the experiment table, and each detection tool comprises a bottom plate, a cover plate, a guide rod, a pressure sensor, a displacement meter, a water tank and a lifting platform, the cover plate is connected with the water tank through a steel wire rope capable of penetrating through the experiment table top; a plurality of vertical guide rods are arranged on the table top of the experiment table, the bottom plate and the cover plate are slidably installed on the guide rods, the cover plate is located above the bottom plate, a pipe to be detected is clamped between the bottom plate and the cover plate, the pressure sensor is arranged between the table top of the experiment table and the bottom plate, and the pressure sensor is arranged on the bottom plate. The displacement meter is arranged on the cover plate and used for detecting the relative displacement of the cover plate and the bottom plate, and the lifting table is located below the water tank. According to the device, the detection efficiency of the creep property of the pipe can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building material performance detection, and particularly relates to a device for detecting the creep performance of thermoplastic pipes. Background Art

[0002] With the urbanization construction in China, thermoplastic pipes such as polyethylene pipes, polypropylene pipes, and polystyrene pipes have good heat resistance, aging resistance, impact resistance, and chemical corrosion resistance, and can be used for urban gas and water supply pipes, transporting hot water, sewage, waste liquid, etc. These pipes are usually buried in the ground soil. In order to evaluate the deformation ability of thermoplastic pipes in the soil, the creep performance of the pipes is usually used to characterize. According to the method in the "Test Method for Creep Ratio of Thermoplastic Pipes", the test principle of the creep performance of the pipes is to place the pipes between two parallel horizontal plates, apply an external load to act on them for 1000 hours, about 42 days, record the deformation amount of the pipes within the specified time, establish the relationship curve between the deformation amount of the pipes and time, and then calculate the creep ratio of the pipes. The test results generally take the arithmetic mean of the test results of three pipes. Although the creep testing machine currently used for detecting the creep performance of pipes has complete functions and is convenient for testing, there are still deficiencies. The testing machine can only test one pipe at a time and occupies a large area. To test a group of pipes, 3 testing machines are required and continuous testing for 42 days is needed, or one testing machine is used to test 3 times respectively, which requires 126 days to complete the detection of a group of pipes. When the number of pipe groups is large, a longer testing time is required, which affects the detection efficiency, or more testing machines need to be purchased, but at the same time, a larger test site is required. Content of the Utility Model

[0003] The purpose of the utility model is to provide a device for detecting the creep performance of thermoplastic pipes, so as to improve the detection efficiency of the creep performance of the pipes.

[0004] A device for detecting the creep performance of thermoplastic pipes of the utility model includes an experimental table, and a plurality of detection toolings are arranged on the experimental table. Each detection tooling includes a bottom plate, a cover plate, a guide rod, a pressure sensor, a displacement meter located above the tabletop of the experimental table, and a water tank and a lifting table located below the tabletop of the experimental table. The cover plate is connected to the water tank through a steel wire rope that can pass through the bottom plate and the tabletop of the experimental table;

[0005] A plurality of vertical guide rods are provided on the tabletop of the test bench. The bottom plate and the cover plate are slidably mounted on the guide rods. The cover plate is located above the bottom plate. A pipe to be detected is clamped between the bottom plate and the cover plate. The pressure sensor is arranged between the tabletop of the test bench and the bottom plate. The displacement gauge is arranged on the cover plate for detecting the relative displacement between the cover plate and the bottom plate. The lifting table is located below the water tank.

[0006] The detection process of the present utility model is as follows: The lifting table lifts the water tank, and the gravity of the water tank is no longer applied to the cover plate through the steel wire rope. The pipe is placed between the bottom plate and the cover plate. Then the lifting table descends, and the water tank is suspended and connected to the cover plate. The required load for the experiment can be applied to the cover plate through the water tank. At the same time, the pressure sensor is used to weigh the weight applied to the pipe, that is, the external load received by the pipe. The displacement gauge obtains the relative displacement between the cover plate and the bottom plate during the experiment, and the obtained experimental data is used to detect the creep performance of the pipe. Each detection tooling of the test bench can be used to detect a pipe, so that a test bench can detect multiple pipes. The device of the present utility model can meet the test of the creep performance of pipes of various sizes. The bottom plate and the cover plate are slidably mounted on the guide rods and can both be replaced. For large-diameter pipes, a larger-sized metal bottom plate and a metal cover plate can be replaced for experimental detection.

[0007] The present utility model also has the following preferred designs:

[0008] The water tank of the present utility model is a sealed water tank connected with a water inlet pipe and a water outlet pipe. The load applied to the pipe can be adjusted by adding water through the water inlet pipe and draining water through the water outlet pipe.

[0009] The water tank of the present utility model is connected to the test bench through an anti-falling rope. It can prevent the water tank from suddenly falling. The anti-falling rope is in a slack state when the steel wire rope is in a normal state, and is stressed to suspend the water tank after the steel wire rope fails and breaks.

[0010] The bottom plate and the cover plate of the present utility model are parallel to each other. Arc-shaped grooves for positioning the pipe are provided on both the bottom plate and the cover plate, which is convenient for positioning and clamping the pipe.

[0011] A plurality of displacement gauges are provided in the present utility model, and the average value of the displacement gauges can be obtained to improve the accuracy of the detection data.

[0012] The displacement gauge of the present utility model is arranged above the cover plate. A hole is provided on the cover plate for the displacement gauge to measure the relative displacement between the cover plate and the bottom plate. The displacement gauge is connected with a control panel, and the measured value of the displacement gauge is displayed on the control panel. Arranging the displacement gauge above the cover plate can facilitate the wiring of the displacement gauge data line.

[0013] The lifting table of the present utility model is a hydraulic lifting table connected to an oil tank, and the control keys of the lifting table are arranged on the tabletop of the test bench, which facilitates the operation of controlling the lifting of the lifting table with the control keys.

[0014] Three detection tooling are arranged on the test bench of the present utility model, and a set of sample creep performance tests of pipes can be completed on one test bench.

[0015] The beneficial effects of the present utility model are as follows:

[0016] 1. The present utility model can meet the creep performance tests of pipes of various sizes. For large-diameter pipes, it is necessary to replace the metal bottom plate and metal cover plate with larger sizes, and the pipes can be fixed on the test bench, which expands the use range of the detection device.

[0017] 2. The present utility model can simultaneously test the creep performance of multiple pipes, and the creep performance of a set of pipe samples can be tested at one time, which greatly improves the detection efficiency.

[0018] 3. The present utility model uses the method of injecting water into the water tank as the long-term external load of the pipes, which is simple to operate and can accurately control the loading weight of the pipes.

[0019] 4. The present utility model can prevent the water tank applying the load from suddenly falling. Description of the Drawings

[0020] Figure 1 is a perspective view of the device for detecting the creep performance of thermoplastic pipes of the present utility model;

[0021] Figure 2 is a structural sectional view of the device for detecting the creep performance of thermoplastic pipes of the present utility model.

[0022] Description of the Reference Numerals:

[0023] 1 - Test bench, 2 - Control keys, 3 - Control panel, 4 - Bottom plate, 5 - Pipe, 6 - Steel wire rope, 7 - Guide rod, 8 - Cover plate, 9 - Displacement gauge, 10 - Lifting table, 11 - Oil tank, 12 - Water tank, 13 - Anti-falling rope, 14 - Pressure sensor. Detailed Embodiments

[0024] The following combines the drawings and embodiments to detail the technical solutions of the present utility model, so that those of ordinary skill in the art can better understand and implement the technical solutions of the present utility model.

[0025] As Figure 1 and Figure 2As shown in the figure, a device for detecting the creep performance of thermoplastic pipes according to the present utility model includes an experimental bench 1, on which a plurality of detection tooling are arranged. Each detection tooling includes a bottom plate 4, a cover plate 8, a guide rod 7, a pressure sensor 14, a displacement gauge 9 located above the tabletop of the experimental bench 1, and a water tank 12 and a lifting platform 10 located below the tabletop of the experimental bench 1. The cover plate 8 is connected to the water tank 12 through a steel wire rope 6 that can pass through the bottom plate 4 and the tabletop of the experimental bench 1;

[0026] On the tabletop of the experimental bench 1, a plurality of vertical guide rods 7 are arranged. The bottom plate 4 and the cover plate 8 are slidably installed on the guide rods 7. The cover plate 8 is located above the bottom plate 4. The pipe 5 to be detected is clamped between the bottom plate 4 and the cover plate 8. The pressure sensor 14 is arranged between the tabletop of the experimental bench 1 and the bottom plate 4. The displacement gauge 9 is arranged on the cover plate 8 to detect the relative displacement between the cover plate 8 and the bottom plate 4. The lifting platform 10 is located below the water tank 12.

[0027] As a preferred embodiment:

[0028] The water tank 12 is a closed water tank connected with a water inlet pipe and a water outlet pipe. The load applied to the pipe 5 can be adjusted by adding water through the water inlet pipe and draining water through the water outlet pipe. The water tank 12 is connected to the experimental bench 1 through an anti-falling rope 13, which can prevent the water tank 12 from suddenly falling. The anti-falling rope 13 is in a relaxed state when the steel wire rope is in a normal state.

[0029] In this embodiment, the bottom plate 4 and the cover plate 8 are parallel to each other. Arc-shaped grooves for positioning the pipe 5 are arranged on both the bottom plate 4 and the cover plate 8, which is convenient for positioning and clamping the pipe 5. In this embodiment, a circular ring is arranged below the cover plate 8 to facilitate the detachable connection with the steel wire rope 6.

[0030] In this embodiment, a plurality of displacement gauges 9 are arranged, Figure 1 As shown in the figure, the number of displacement gauges is 4. The average value of the displacement gauges 9 can be obtained to improve the accuracy of the detection data. The displacement gauges 9 are arranged above the cover plate 8. Holes are arranged on the cover plate 8 for the displacement gauges 9 to measure the relative displacement between the cover plate 8 and the bottom plate 4. The displacement gauges 9 are connected to a control panel 3. Arranging the displacement gauges 9 above the cover plate 8 can facilitate the wiring of the data lines of the displacement gauges 9.

[0031] In this embodiment, the lifting platform 10 is a hydraulic lifting platform connected with an oil tank 11. The control keys 2 of the lifting platform 10 are arranged on the tabletop of the experimental bench 1. It is convenient to control the lifting of the lifting platform 10 with the control keys 2.

[0032] As a preferred embodiment, three such detection tooling are arranged on the experimental bench 1, and one experimental bench 1 can complete the creep performance test of a group of pipe samples.

[0033] The detection process of the present utility model is as follows: Operate the control key 2 to control the lifting platform 10 to lift the water tank 12, so that the gravity of the water tank 12 is no longer applied to the cover plate 8 through the steel wire rope 6. Place the pipe 5 to be tested on the arc-shaped groove on the bottom plate 4, place the cover plate 8 on the upper part of the pipe 5, pass the steel wire rope 6 through the bottom plate 4 and connect it to the ring on the lower surface of the cover plate 8. Install 4 displacement gauges 9 on the upper surface of the cover plate 8 and adjust the readings to zero. Operate the control key 2 to lower the lifting platform 10, so that the water tank 12 is suspended on the metal cover plate 8. The pump controller of the water inlet pipe of the water tank 12 can be set or connected to the control panel 3. By operating the control panel 3 to control the water filling of the water tank 12 and observing the readings of the displacement gauges 9 on the control panel 3, when the readings reach (1.5±0.2)% of the inner diameter of the pipe 5 to be tested, that is, (0.015±0.002)di (di is the inner diameter of the pipe, unit: m), stop filling water into the water tank 12. Finally, check the displacement value 6 minutes after the water tank 12 stops filling water on the control panel 3, and start timing from this time point. Check the displacement values at 1h, 4h, 24h, 168h, 336h, 504h, 600h, 696h, 840h, 1008h respectively on the control panel 3. That is, one pipe 5 to be tested needs to record the displacement values at 11 time points, and calculate the creep ratio of the pipe 5 according to the relevant formula. The present utility model applies the load required for the experiment to the cover plate 8 through the water tank 12, and at the same time, the pressure sensor 14 is used to weigh the weight applied to the pipe 5, that is, the external load received by the pipe 5. The present utility model can meet the creep performance tests of pipes of various sizes. For large-diameter pipes, larger-sized metal bottom plates and metal cover plates need to be replaced.

[0034] The above-mentioned embodiments are only relatively preferred embodiments of the present utility model, but cannot be used as a limitation to the utility model. Any variations and improvements made based on the concept of the present utility model should fall within the protection scope of the present utility model. The specific protection scope shall be subject to the content recorded in the claims.

Claims

1. A device for detecting the creep performance of thermoplastic pipes, comprising an experimental table, characterized in that: A plurality of detection tooling is arranged on the experimental table. Each detection tooling includes a bottom plate, a cover plate, a guide rod, a pressure sensor, a displacement meter located above the tabletop of the experimental table, and a water tank and a lifting table located below the tabletop of the experimental table. The cover plate is connected to the water tank through a steel wire rope capable of passing through the bottom plate and the tabletop of the experimental table; A plurality of vertical guide rods are arranged on the tabletop of the experimental table. The bottom plate and the cover plate are slidably installed on the guide rods. The cover plate is located above the bottom plate. The pipe to be detected is clamped between the bottom plate and the cover plate. The pressure sensor is arranged between the tabletop of the experimental table and the bottom plate. The displacement meter is arranged on the cover plate for detecting the relative displacement between the cover plate and the bottom plate. The lifting table is located below the water tank.

2. The device for detecting the creep performance of thermoplastic pipes according to claim 1, characterized in that: The water tank is a closed water tank connected with a water inlet pipe and a water outlet pipe.

3. The device for detecting the creep performance of thermoplastic pipes according to claim 2, wherein: The water tank is connected to the experimental table through an anti-falling rope.

4. The device for detecting the creep performance of thermoplastic pipes according to claim 3, characterized in that: The bottom plate and the cover plate are parallel to each other. Arc-shaped grooves for positioning the pipe are arranged on both the bottom plate and the cover plate.

5. The device for detecting the creep performance of thermoplastic pipes according to any one of claims 1 to 4, characterized in that: A plurality of displacement meters are arranged.

6. The device for detecting the creep performance of thermoplastic pipes according to claim 5, characterized in that: The displacement meters are arranged above the cover plate. Holes are arranged on the cover plate for the displacement meters to measure the relative displacement between the cover plate and the bottom plate.

7. The device for detecting the creep performance of thermoplastic pipes according to claim 6, characterized in that: The displacement meters are connected to a control panel.

8. The device for detecting the creep performance of thermoplastic pipes according to claim 5, characterized in that: The lifting table is a hydraulic lifting table connected with an oil tank. The control keys of the lifting table are arranged on the tabletop of the experimental table.

9. The device for detecting the creep performance of thermoplastic pipes according to claim 5, characterized in that: Three sets of the detection tooling are arranged on the experimental table.

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