A high polymer expansion characteristic testing device

Abstract

The application discloses a high polymer expansion characteristic testing device, and belongs to the high polymer expansion characteristic testing field.The high polymer expansion characteristic testing device comprises a testing cylinder, a grouting valve fixedly connected to the bottom end of the testing cylinder and communicating with the inside of the testing cylinder, and an elastic silica gel sleeve sleeved in the testing cylinder and having an open end downwardly aligned with the grouting valve and used for simulating the inner wall of a grouting soil layer.The elastic silica gel sleeve is provided with a first air nozzle extending to the outside of the testing cylinder and used for air supplement and air release of the elastic silica gel sleeve.The high polymer expansion characteristic testing device can simulate the non-uniform constraint of the grouting soil layer on the expansion of the high polymer material through cooperation of the elastic silica gel sleeve and components such as the air cylinder and the piston.Meanwhile, cooperation of the infrared distance measuring sensor and the pressure sensor can realize real-time measurement of the displacement distance of the piston and the pressure in the air cylinder, and thus accurate and real-time data support is provided for analysis of the expansion characteristics of the high polymer material.

Description

Technical Field

[0001] This application relates to the field of polymer expansion characteristic testing technology, specifically a polymer expansion characteristic testing device. Background Technology

[0002] The polymer expansion characteristic test device is mainly used to study the volume expansion behavior of polymer materials (such as polyurethane, epoxy resin, etc.) under chemical reactions or physical stimuli, record the pressure changes of the material from the initial state to the complete expansion process, analyze the dynamic changes of the material density with the expansion process, and study the expansion characteristics of the material under different constraints such as fixed volume or fixed confining pressure.

[0003] Traditional fixed-volume containers cannot simulate the dynamic expansion process of materials constrained by the surrounding medium, such as the non-uniform resistance of the soil layer during crack grouting. They cannot accurately simulate the non-uniform constraint of the sample, resulting in large deviations in expansion characteristics during practical applications.

[0004] Therefore, this application provides a polymer expansion characteristic testing device to solve the above problems. Utility Model Content

[0005] This application provides a polymer expansion property testing device, which aims to solve the existing problems mentioned in the background art.

[0006] To achieve the above objectives, this application provides the following technical solution: a polymer expansion characteristic testing device, comprising a test cylinder, a grouting valve fixedly connected to the bottom end of the test cylinder and communicating with its interior, and an elastic silicone sleeve fitted inside the test cylinder with its open end facing downwards and aligned with the grouting valve to simulate the inner wall of the grouting soil layer. The elastic silicone sleeve has a first air nozzle extending outside the test cylinder for air supply and release. A connecting pipe is fixedly installed on the first air nozzle, and the other end of the connecting pipe is connected to an air cylinder. A piston moves longitudinally inside the air cylinder, and a piston rod is fixedly connected to the top of the piston. An electric push rod with its movable end connected to the piston rod is fixedly installed at the top of the air cylinder. An infrared ranging sensor for measuring the displacement distance of the piston is fixedly installed at the bottom end of the air cylinder. A pressure sensor is fixedly installed inside the air cylinder near the bottom end. The input end of the electric push rod, the output end of the infrared ranging sensor, and the output end of the pressure sensor are all connected to an external control system. In this way, by combining the elastic silicone sleeve with components such as the air cylinder and piston, the non-uniform constraint of the grouting soil layer on the expansion of polymer materials can be simulated. Compared with traditional fixed-volume containers, it is closer to the actual application scenario and reduces the deviation of expansion characteristics in actual applications. At the same time, with the help of infrared ranging sensors and pressure sensors, the displacement distance of the piston and the pressure inside the air cylinder can be measured in real time, providing accurate and real-time data support for analyzing the expansion characteristics of polymer materials.

[0007] Preferably, the side of the air cylinder near the bottom has a second air nozzle communicating with its interior, and the end of the connecting pipe away from the first air nozzle is fixedly installed on the second air nozzle.

[0008] Preferably, the grouting valve is a one-way valve.

[0009] Preferably, the elastic silicone sleeve is an airbag customized according to the shape of the grouting soil layer.

[0010] Preferably, the top of the test cylinder has an opening for replacing the elastic silicone sleeve, and an end cap is screwed onto the opening at the top of the test cylinder.

[0011] Preferably, the test cylinder is provided with a longitudinally movable pressure head for pressing against the top of the elastic silicone sleeve, and the pressure head is rotatably connected to a screw that is screwed to the end cap, and the top of the screw has a handle.

[0012] This polymer expansion characteristic testing device, through the cooperation of elastic silicone sleeves and components such as air cylinders and pistons, can simulate the non-uniform constraint of grouting soil layers on the expansion of polymer materials. Compared with traditional fixed-volume containers, it is closer to the actual application scenario and reduces the deviation of expansion characteristics in actual applications. At the same time, with the cooperation of infrared distance measuring sensors and pressure sensors, it can measure the displacement distance of the piston and the pressure inside the air cylinder in real time, providing accurate and real-time data support for analyzing the expansion characteristics of polymer materials in terms of pressure and volume changes.

[0013] This polymer expansion characteristic testing device can be adjusted by the pressure head to fit customized silicone sleeves of different heights. Different shapes of grouting soil layers have different resistance distributions to polymer expansion, and the customized elastic silicone sleeve can accurately reflect this non-uniform resistance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a polymer expansion characteristic testing device. Figure 2 This is a schematic diagram of the internal structure of a polymer expansion characteristic testing device.

[0015] In the picture: 1. Test cylinder; 11. Grouting valve; 12. End cap; 13. Pressure head; 14. Screw; 141. Handle; 2. Elastic silicone sleeve; 21. First air nozzle; 3. Connecting pipe; 4. Air pump; 41. Piston; 42. Piston rod; 43. Electric push rod; 44. Second air nozzle; 5. Infrared ranging sensor; 6. Pressure sensor. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] This embodiment provides a polymer expansion characteristic testing device, such as... Figures 1-2 As shown, the polymer expansion characteristic testing device includes a test cylinder 1, a grouting valve 11 fixedly connected to the bottom end of the test cylinder 1 and communicating with its interior, and an elastic silicone sleeve 2 fitted inside the test cylinder 1 with its open end facing downwards and aligned with the grouting valve 11 to simulate the inner wall of the grouting soil layer. The elastic silicone sleeve 2 has a first air nozzle 21 extending to the outside of the test cylinder 1 for replenishing and releasing air from the elastic silicone sleeve 2. A connecting pipe 3 is fixedly installed on the first air nozzle 21, and the other end of the connecting pipe 3 is connected to an air cylinder 4. A piston 41 moves longitudinally inside the air cylinder 4, and a piston rod 42 is fixedly connected to the top end of the piston 41. An electric push rod 43 with its movable end connected to the piston rod 42 is fixedly installed at the top end of the air cylinder 4. An infrared ranging sensor 5 for measuring the displacement distance of the piston 41 is fixedly installed at the bottom end of the air cylinder 4. A pressure sensor 6 is fixedly installed inside the air cylinder 4 near the bottom end. The input end of the electric push rod 43, the output end of the infrared ranging sensor 5, and the output end of the pressure sensor 6 are all connected to an external control system.

[0018] In use, polymer material is injected into the test cylinder 1 through the grouting valve 11, filling the space surrounded by the elastic silicone sleeve 2 inside the test cylinder 1. The external control system controls the electric push rod 43 to start working, preset the constant pressure of the elastic silicone sleeve 2 to simulate the soil layer. According to the preset pressure value, the program drives the piston 41 to move, inflating the elastic silicone sleeve 2. Since the air cylinder 4 is connected to the elastic silicone sleeve 2 through the connecting pipe 3, the internal pressure of the two is consistent. At this time, the pressure sensor 6 monitors the air pressure inside the silicone sleeve. Once the air pressure increases, it means that the grouting is completely filled and expansion begins. At this time, the elastic silicone sleeve 2 is squeezed, which increases the air pressure. The external control system sends a command to the electric push rod 43 to perform constant pressure regulation, thereby driving the piston 41 to move upward. At this time, the infrared distance sensor 5 monitors the distance moved by the piston 41. The volume of the grouting material expansion is obtained by multiplying the displacement distance by the cross-sectional area of ​​the air cylinder 4. These data are processed and analyzed to obtain characteristic data such as pressure change and volume change of the polymer material during the expansion process.

[0019] Specifically, the side of the air cylinder 4 near the bottom has a second air nozzle 44 that communicates with its interior, and the end of the connecting pipe 3 away from the first air nozzle 21 is fixedly installed on the second air nozzle 44. By setting the second air nozzle 44 and the reasonable installation method of the connecting pipe 3, stable and effective gas flow between the air cylinder 4 and the elastic silicone sleeve 2 is achieved, ensuring that the air pressure inside the elastic silicone sleeve 2 can be accurately controlled, thereby more accurately simulating the non-uniform constraint of the grouting soil layer on the expansion of the polymer, and improving the accuracy and reliability of the test data.

[0020] It should be noted that the grouting valve 11 is a one-way valve; the characteristic of the one-way valve ensures that the polymer material can only be injected into the test cylinder 1 through the grouting valve 11, and there will be no reverse flow. This ensures the stability and one-time operation of the grouting process, avoids the waste caused by the backflow of polymer material and the inaccuracy of test data. At the same time, the one-way valve has a simple and reliable structure, which reduces the probability of test device failure and improves the efficiency and success rate of the test.

[0021] Furthermore, the elastic silicone sleeve 2 is an airbag customized according to the shape of the grouting soil layer; different shapes of grouting soil layers have different resistance distributions to polymer expansion, and the customized elastic silicone sleeve 2 can accurately reflect this non-uniform resistance, improving the accuracy of the test.

[0022] Furthermore, the top of the test cylinder 1 has an opening for replacing the elastic silicone sleeve 2, and an end cap 12 is screwed onto the opening at the top of the test cylinder 1. When it is necessary to replace the elastic silicone sleeve 2, the end cap 12 is rotated to remove it from the opening at the top of the test cylinder 1. Then the old elastic silicone sleeve 2 can be easily removed and the new elastic silicone sleeve 2 can be installed. After installation, the end cap 12 is rotated and screwed back onto the opening at the top of the test cylinder 1 to complete the replacement operation.

[0023] Furthermore, the test cylinder 1 is equipped with a longitudinally movable pressure head 13 for pressing against the top of the elastic silicone sleeve 2. A screw 14, which is screwed to the end cap 12, is rotatably connected to the pressure head 13. The top of the screw 14 has a handle 141. When it is necessary to press against the top of the elastic silicone sleeve 2, the handle 141 is rotated clockwise, the screw 14 moves downward, and pushes the pressure head 13 downward to press against the top of the elastic silicone sleeve 2. When it is necessary to loosen the top of the elastic silicone sleeve 2, the handle 141 is rotated counterclockwise, the screw 14 moves upward, and drives the pressure head 13 upward to loosen. The pressure head 13 can be adjusted to accommodate customized silicone sleeves of different heights.

[0024] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and concept of this application, should be included within the scope of protection of this application.

Claims

1. A polymer expansion characteristic testing device, characterized in that: The test tube includes a test tube (1), a grouting valve (11) fixedly connected to the bottom of the test tube (1) and communicating with its interior, and an elastic silicone sleeve (2) fitted inside the test tube (1) with its open end facing downwards and aligned with the grouting valve (11) to simulate the inner wall of the grouting soil layer. The elastic silicone sleeve (2) has a first air nozzle (21) extending to the outside of the test tube (1) for replenishing and releasing air from the elastic silicone sleeve (2). A connecting pipe (3) is fixedly installed on the first air nozzle (21), and the other end of the connecting pipe (3) is connected to an air cylinder (4). The air cylinder (4) moves longitudinally inside. There is a piston (41), and a piston rod (42) is fixedly connected to the top of the piston (41). An electric push rod (43) with its movable end connected to the piston rod (42) is fixedly installed at the top of the air cylinder (4). An infrared ranging sensor (5) for measuring the displacement distance of the piston (41) is fixedly installed at the bottom of the air cylinder (4). A pressure sensor (6) is fixedly installed inside the air cylinder (4) near the bottom. The input end of the electric push rod (43), the output end of the infrared ranging sensor (5) and the output end of the pressure sensor (6) are all connected to an external control system.

2. The polymer expansion characteristic testing device according to claim 1, characterized in that: The air cylinder (4) has a second air nozzle (44) on its side near the bottom end, which communicates with the interior of the cylinder. The end of the connecting pipe (3) away from the first air nozzle (21) is fixedly installed on the second air nozzle (44).

3. The polymer expansion characteristic testing device according to claim 2, characterized in that: The grouting valve (11) is a one-way valve.

4. The polymer expansion characteristic testing device according to claim 3, characterized in that: The elastic silicone sleeve (2) is an airbag customized according to the shape of the grouting soil layer.

5. The polymer expansion characteristic testing device according to claim 4, characterized in that: The test tube (1) has an opening at the top for replacing the elastic silicone sleeve (2), and an end cap (12) is screwed onto the opening at the top of the test tube (1).

6. The polymer expansion characteristic testing apparatus according to claim 5, characterized in that: The test cylinder (1) is provided with a longitudinally movable pressure head (13) for pressing against the top of the elastic silicone sleeve (2). The pressure head (13) is rotatably connected to a screw (14) that is screwed to the end cap (12). The top of the screw (14) has a handle (141).

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