A device for determining the adhesion of polyurethane grouting materials

Abstract

This utility model relates to the technical field of adhesion testing devices, specifically a device for measuring the adhesion of polyurethane grouting materials. It includes: a bottom sample stage, a universal testing machine body, and a programmable computer. The bottom sample stage is mounted on the base of the universal testing machine body, and a clamping assembly is mounted on the displacement beam. The device fixes the substrate to be tested in the center of the bottom sample stage, applies polyurethane grouting material to the center of the substrate surface, and places a pre-made Marshall cylindrical mixture specimen on top to allow the grouting material to cure naturally. Four adjusting rods are manually tightened to clamp the Marshall specimen, and the displacement beam is controlled to move upwards at a uniform speed. This device can efficiently and stably test the interfacial adhesion performance between polyurethane grouting materials and different road substrates under controlled temperature and humidity conditions, improving the engineering guidance value and application extrapolation of the experimental results. Furthermore, worn clamping plates can be easily removed and replaced.

Description

Technical Field

[0001] This utility model relates to the technical field of adhesion force testing devices, specifically a device for measuring the adhesion force of polyurethane grouting materials. Background Technology

[0002] Two-component polyurethane grouting materials possess excellent waterproofing properties and good adhesion, making them widely used in road engineering, especially in trenchless grouting repair of deep structural road defects. Therefore, when polyurethane grouting materials are applied to treat deep road defects, in addition to strict requirements on their mechanical properties, their bonding performance with different road layers directly determines the quality and durability of the repair project.

[0003] However, in the existing technology, the testing of polyurethane grouting materials mostly relies on simple visual inspection or indirect evaluation on site, which cannot objectively and accurately reflect the true bonding state of the materials in actual engineering. There is a lack of dedicated equipment that can accurately measure the interfacial adhesion performance, and general testing equipment is difficult to directly measure the interfacial adhesion strength of different materials. Therefore, there is an urgent need for a dedicated testing device for polyurethane grouting materials.

[0004] Therefore, this utility model proposes a device for measuring the adhesion force of polyurethane grouting materials to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a device for measuring the adhesion of polyurethane grouting materials, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for measuring the adhesion force of polyurethane grouting materials, comprising: a bottom sample stage, a universal testing machine body, and a programmable computer; the universal testing machine body is symmetrically equipped with vertical transmission screws, and the two ends of the displacement beam are threadedly connected to the vertical transmission screws; the universal testing machine body is equipped with a programmable computer; the bottom sample stage is provided on the base of the universal testing machine body, a tightening clamp is movably provided on the bottom sample stage, and a clamping assembly is provided on the displacement beam.

[0007] Preferably, the clamping assembly includes a fixed frame, a force sensor, a support rod, an adjusting rod, and a clamping plate. The force sensor is symmetrically connected and disposed at the bottom end of the displacement beam, and the other end of the force sensor is connected to the fixed frame via the support rod.

[0008] Preferably, adjusting rods are threadedly connected at equal intervals on the four side walls of the fixed frame, guide holes are equally spaced on the four side walls of the fixed frame, and guide posts are connected to the side walls of the clamping plate, with the guide posts and guide holes being positioned and inserted into each other.

[0009] Preferably, the end wall of the clamping plate is covered with a non-slip hard rubber layer, the side wall of the clamping plate is provided with an installation groove, the two side walls of the installation groove are symmetrically provided with slots, and the end of the adjusting rod is rotatably connected with an installation block, which is inserted into the installation groove.

[0010] Preferably, an L-shaped groove is provided on the side wall of the mounting block, and two L-shaped plates are symmetrically connected in the L-shaped groove. The two ends of the spring are fixedly connected to the two L-shaped plates respectively. A locking block that penetrates the mounting block is provided on the side wall of the L-shaped plate, and the locking block engages with the locking groove.

[0011] Preferably, an emergency brake button is provided on the base of the universal testing machine body, a temperature and humidity control module is provided on the universal testing machine body, and a transparent sealing cover is provided on the outside of the universal testing machine body.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] By fixing the substrate to be tested in the center of the bottom sample stage, applying polyurethane grouting material to the center of the substrate surface, and placing a pre-made Marshall cylindrical mixture specimen on top of it to allow the grouting material to cure naturally, the four adjusting rods are manually tightened to clamp the Marshall specimen, and the displacement beam is controlled to move upward at a uniform speed. This device can efficiently and stably complete the interfacial adhesion performance test between polyurethane grouting material and different road substrates in a controlled temperature and humidity environment, improving the engineering guidance value and application extrapolation of the experimental results; at the same time, the worn clamping plate can be easily removed and replaced. Attached Figure Description

[0014] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the connection of the fixed frame structure of this utility model;

[0016] Figure 3 This is an exploded view of the fixed frame structure connection of this utility model;

[0017] Figure 4 This utility model Figure 3 A magnified view of a portion of the image;

[0018] Figure 5 This is a half-sectional view of the mounting block structure of this utility model.

[0019] In the figure: 1. Bottom sample stage; 2. Fixing frame; 201. Guide hole; 3. Universal testing machine body; 4. Force sensor; 5. Programmable computer; 6. Tightening fixture; 7. Displacement beam; 8. Support rod; 9. Adjusting rod; 901. Mounting block; 902. L-shaped groove; 903. L-shaped plate; 904. Spring; 905. Clamping block; 10. Clamping plate; 10. Guide column; 1001. Mounting groove; 1002. Clamping slot; 1003. Vertical transmission screw; 11. Emergency brake button; 12. Temperature and humidity control module; 13. Transparent sealing cover; 14. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] Please see Figures 1-5 This utility model provides a technical solution: a device for measuring the adhesion force of polyurethane grouting materials, comprising: a bottom sample stage 1, a universal testing machine body 3, and a programmable computer 5; the universal testing machine body 3 is symmetrically driven by vertical transmission screws 11, and the two ends of the displacement beam 7 are connected to the vertical transmission screws 11 by transmission threads; the universal testing machine body 3 is equipped with a programmable computer 5; the bottom sample stage 1 is provided on the base of the universal testing machine body 3, the bottom sample stage 1 is movably equipped with a tightening clamp 6, and the displacement beam 7 is equipped with a clamping assembly.

[0022] The programmable computer 5 controls the internal gear system of the motor inside the main body of the testing machine, which drives the vertical transmission screw 11, so that the displacement beam 7 can move up and down, realizing the pull-out motion between the specimen and the substrate.

[0023] The force sensor 4 in the clamping assembly is symmetrically connected to the bottom end of the displacement beam 7, and the other end of the force sensor 4 is connected to the fixed frame 2 via a support rod 8. Adjusting rods 9 are threadedly connected at equal intervals on the four side walls of the fixed frame 2, and guide holes 201 are equally spaced on the four side walls of the fixed frame 2. Guide posts 1001 are connected to the side wall of the clamping plate 10, and the guide posts 1001 are positioned and inserted into the guide holes 201.

[0024] By rotating the four sets of adjusting rods 9, the clamping plate 10 installed on the adjusting rods 9 is driven by the threaded structure to clamp the specimen around its perimeter, ensuring the stability of the specimen during the test. The guide post 1001 and the guide hole 201 are positioned and inserted to provide guidance.

[0025] The clamping plate 10 has an anti-slip hard rubber layer covering its end wall. The clamping plate 10 has an installation groove 1002 on its side wall. The two sides of the installation groove 1002 have symmetrical slots 1003. The end of the adjusting rod 9 is rotatably connected to an installation block 901, which is inserted into the installation groove 1002.

[0026] The inner contact surface of the clamping plate 10 is covered with a non-slip hard rubber layer to enhance clamping stability and prevent the specimen from slipping. The mounting block 901 is inserted into the mounting groove 1002 for positioning the clamping plate 10 on the adjusting rod 9, which facilitates the replacement of the non-slip hard rubber layer of the clamping plate 10 when it wears out.

[0027] An L-shaped groove 902 is provided on the side wall of the mounting block 901. Two L-shaped plates 903 are symmetrically connected in the L-shaped groove 902. The two ends of the spring 904 are fixedly connected to the two L-shaped plates 903 respectively. A locking block 905 is provided on the side wall of the L-shaped plate 903, which penetrates the mounting block 901. The locking block 905 is engaged with the locking groove 1003.

[0028] The compressed spring 904 pushes the L-shaped plate 903 to the end of the L-shaped groove 902, ensuring that the locking block 905 is stably engaged in the locking groove 1003, thereby realizing the connection and setting of the clamping plate 10 on the adjusting rod 9.

[0029] An emergency brake button 12 is provided on the base of the universal testing machine body 3, a temperature and humidity control module 13 is provided on the universal testing machine body 3, and a transparent sealing cover 14 is provided on the outside of the universal testing machine body 3.

[0030] The programmable computer 5 is connected to the force sensor 4, the universal testing machine body 3, and the temperature and humidity control module 13 to achieve synchronous control and data recording of mechanical response and environmental parameters. The testing machine body is also equipped with a displacement sensor to monitor the displacement changes of the crossbeam in real time, ensuring the accuracy and stability during the test. The testing machine base is equipped with an emergency brake button 12, which can be used to quickly stop the testing machine in case of abnormality, ensuring the safety of the experiment. The temperature and humidity control module 13 includes a heating unit, a humidification unit, and a temperature and humidity sensor located at the bottom of the test space, which is used to achieve real-time adjustment and closed-loop control of the temperature and humidity inside the transparent enclosure 14 to ensure that the test environment operates stably within the set parameter range. The transparent enclosure 14 is located outside the area where the universal testing machine body is located, forming a relatively sealed test space. Its side walls are equipped with an openable structure for placing and removing the specimen.

[0031] Working Principle: Before operation, first connect the temperature and humidity control module 13, the universal testing machine 3, and the programmable computer 5 to the external power supply to complete the system initialization settings. According to the test requirements, set the target temperature and humidity parameters in the programmable computer 5. After the system starts, the temperature and humidity control module 13 begins to pre-adjust the space inside the transparent enclosure 14. After the environmental parameters stabilize within the set range, proceed to the next stage. Place the substrate to be tested in the center of the bottom sample stage and fix it with the movable clamps 6 on both sides to ensure that the specimen is horizontal and centered. Then, apply a quantitative and proportionally pre-mixed polyurethane grouting material to the center of the surface of the substrate and place the pre-made Marshall cylindrical mixture specimen on top of it. After the grouting material has cured naturally for two hours, proceed to the next step. Control the displacement beam 7 and the fixing frame 2 to move down through the programmable computer 5, so that the Marshall specimen enters the center position of the clamp. Manually tighten the four adjusting rods 9 to clamp the Marshall specimen, ensuring its fixation and coaxiality during loading. Close the sampling door at the front of the transparent enclosure, and the system enters the test preparation state. After the temperature and humidity of the test space stabilize within the preset parameter range, start the formal loading test program. During the test, the programmable computer 5 controls the displacement beam 7 to move upward at a uniform speed, applying a vertical pull-out force to the specimen. During loading, the force sensor 4 and displacement sensor collect loading force and displacement data in real time, while the temperature and humidity control module 13 records environmental parameters. The programmable computer 5 simultaneously generates a three-dimensional response curve of "loading force – displacement – ​​environmental conditions". If the bonding interface fails, the system can automatically identify the stress mutation point and mark the maximum adhesion strength. After the test, the programmable computer automatically stops loading and saves complete test data. The operator can open the sampling door to remove the remaining specimen and substrate for further cross-sectional observation and bonding failure mode analysis. This device enables efficient and stable testing of the interfacial adhesion performance between polyurethane grouting materials and different road substrates under controlled temperature and humidity conditions, enhancing the engineering guidance value and application extrapolation of the experimental results. Simultaneously, by moving the L-shaped plates 903 on both sides to compress the springs 904, the locking block 905 can be separated from the slot 1003, allowing the worn clamping plate 10 to be removed for quick replacement.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An apparatus for measuring the adhesion force of polyurethane grouting materials, comprising: Bottom sample stage (1), universal testing machine body (3), programmable computer (5); the universal testing machine body (3) is symmetrically driven by vertical transmission screws (11), the two ends of the displacement beam (7) are connected to the transmission threads of the vertical transmission screws (11), and the universal testing machine body (3) is equipped with a programmable computer (5). The feature is that: a bottom sample stage (1) is provided on the base of the universal testing machine body (3), a tightening clamp (6) is movably provided on the bottom sample stage (1), and a clamping assembly is provided on the displacement beam (7).

2. The apparatus for determining the adhesion force of polyurethane grouting materials according to claim 1, characterized in that: The clamping assembly includes a fixed frame (2), a force sensor (4), a support rod (8), an adjusting rod (9), and a clamping plate (10). The force sensor (4) is symmetrically connected and arranged at the bottom end of the displacement beam (7), and the other end of the force sensor (4) is connected to the fixed frame (2) through the support rod (8).

3. The device for determining the adhesion force of polyurethane grouting material according to claim 2, characterized in that: Adjusting rods (9) are threadedly connected at equal intervals on the four side walls of the fixed frame (2). Guide holes (201) are opened at equal intervals on the four side walls of the fixed frame (2). Guide posts (1001) are connected to the side wall of the clamping plate (10). The guide posts (1001) are positioned and inserted into the guide holes (201).

4. The apparatus for determining the adhesion force of polyurethane grouting materials according to claim 3, characterized in that: The end wall of the clamping plate (10) is covered with a non-slip hard rubber layer. The side wall of the clamping plate (10) is provided with an installation groove (1002). The two side walls of the installation groove (1002) are symmetrically provided with slots (1003). The end of the adjusting rod (9) is rotatably connected with an installation block (901). The installation block (901) is inserted into the installation groove (1002).

5. The apparatus for determining the adhesion force of polyurethane grouting materials according to claim 4, characterized in that: The mounting block (901) has an L-shaped groove (902) on its side wall. Two L-shaped plates (903) are symmetrically connected in the L-shaped groove (902). The two ends of the spring (904) are fixedly connected to the two L-shaped plates (903) respectively. The side wall of the L-shaped plate (903) is connected to a locking block (905) that penetrates the mounting block (901). The locking block (905) engages with the locking groove (1003).

6. The apparatus for determining the adhesion force of polyurethane grouting materials according to claim 1, characterized in that: An emergency brake button (12) is provided on the base of the universal testing machine body (3), a temperature and humidity control module (13) is provided on the universal testing machine body (3), and a transparent sealing cover (14) is provided on the outside of the universal testing machine body (3).

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