Test piece fixing device used in cohesiveness test of base material and structural sealant

Abstract

The utility model discloses a test piece fixing device used in a cohesiveness test of a base material and a structural sealant, which comprises a base, a test piece frame, a connecting piece used for being connected with a tension tester, at least one pressing plate and a threaded rod, the connecting piece is rotatably connected to the middle of the lower surface of the base, and the test piece frame is horizontally and slidably connected to the upper surface of the base. A front end opening and a rear back plate are arranged on the front face and the rear face of the test piece frame respectively, a base material penetrating-out hole transversely penetrating through the test piece frame is formed in the side face, close to the rear back plate, of the test piece frame, a strip-shaped adhesive piece penetrating-out hole is formed in the upper face of the test piece frame, the pressing plate can be installed at the front end opening of the test piece frame in a sliding mode, and a plurality of threaded holes are formed in the pressing plate and the rear back plate respectively. The threaded rod is used for being connected into the threaded hole. According to the utility model, test pieces with various sizes and styles can be fixed.

Description

Technical Field

[0001] This utility model relates to the field of building material performance testing, specifically a specimen fixing device used in the adhesion test between a substrate and a structural sealant. Background Technology

[0002] Structural sealants are characterized by high strength, peel resistance, impact resistance, and simple construction process. They can withstand large loads and are resistant to aging, fatigue, and corrosion. They maintain stable performance within their expected lifespan and are suitable for strong structural bonding. They can be used for bonding the same or different materials such as metals, ceramics, plastics, and wood. In practical engineering, they are mainly used for the reinforcement, anchoring, bonding, and repair of components.

[0003] One aspect of assessing the performance of structural sealants is testing the adhesion between the substrate and the sealant. The standard "Silicone Sealants for Building Use" (GB16776-2005) mentions a test method for the adhesion between actual engineering substrates (such as glass, aluminum, aluminum composite panels, and stone) and the sealant. The test principle involves bonding a strip of adhesive to the actual engineering substrate using structural sealant to create a specimen. The substrate is then connected to the lower connecting seat of a tensile testing machine via a fixing device, and the strip of adhesive is connected to the upper clamp of the tensile testing machine. Tensile testing is then performed using the tensile testing machine, and the peel adhesion of the specimen after immersion in water is measured.

[0004] However, the substrates used in actual engineering come in various sizes and styles, resulting in a variety of sizes and styles of the prepared specimens. During testing, it is often necessary to select appropriate fixing devices based on the specimen's size and style before using a tensile testing machine. Therefore, the following problems arise during testing: when testing a large number of specimens with different substrate sizes and styles, different specimen fixing devices need to be used depending on the specimen type, leading to low testing efficiency and the need to prepare multiple specimen fixing devices in advance. Utility Model Content

[0005] The purpose of this invention is to provide a specimen fixing device for use in the adhesion test between substrate and structural sealant, which can fix specimens of various sizes and styles.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A specimen fixing device for use in a substrate-structural sealant adhesion test, characterized in that it includes a base, a specimen frame, a connector for connection to a tensile testing machine, at least one pressure plate and a threaded rod. The connector is rotatably connected to the lower middle part of the base, the specimen frame is horizontally slidably connected to the upper part of the base, the front and rear of the specimen frame are respectively provided with a front port and a rear plate, the side of the specimen frame near the rear plate is provided with a substrate through hole that runs horizontally through the specimen frame, the upper part of the specimen frame is provided with a strip-shaped adhesive through hole, the pressure plate is slidably installed at the front port of the specimen frame, and the pressure plate and the rear plate are respectively provided with multiple threaded holes, the threaded rod being connected in the threaded holes.

[0008] A further technical solution of this utility model is as follows: a vertical groove is provided on the side of the specimen frame near the front port, the upper end of the groove extends through the top of the specimen frame, and sliders are provided at both ends of the pressure plate, the sliders being slidably connected in the groove.

[0009] A further technical solution of this utility model is: the two ends of the pressure plate are respectively provided with connecting parts that bend to one side, and the slider is provided on the connecting parts.

[0010] A further technical solution of this utility model is as follows: the connecting member includes a connecting rod, which is rotatably connected to the lower center of the base through a bearing, and the connecting rod is provided with a connecting hole.

[0011] A further technical solution of this utility model is as follows: a horizontal guide rail is provided on the top of the base, and a guide groove is provided on the bottom of the specimen frame, with the guide groove and the guide rail slidably connected together.

[0012] A further technical solution of this utility model is: the through hole in the substrate is a rectangular hole.

[0013] A further technical solution of this utility model is: the strip adhesive patch through hole is a strip-shaped hole extending front and back, and the rear end of the strip adhesive patch through hole passes through the rear of the specimen frame.

[0014] A further technical solution of this utility model is: the base is a metal plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) This utility model can place specimens of different sizes and styles in a specimen frame. The number and position of the pressure plates can be adjusted according to the size of the specimen. The pressure plates are clamped in the specimen frame by a threaded rod connected in a threaded hole against the substrate. For specimens with excessively long substrates, the substrate can be passed through a through-hole and clamped by a threaded rod connected in a threaded hole. Therefore, the specimen fixing device of this utility model can clamp and fix specimens of various sizes and styles, thereby improving the efficiency of adhesion testing, reducing the number of specimen fixing devices required, and saving testing costs.

[0017] (2) When fixed, the position of the specimen frame can be adjusted by horizontal sliding so that the connection position of the connector and the lower connecting seat of the tensile testing machine and the connection position of the strip adhesive on the specimen and the upper clamp of the tensile testing machine are on the same plumb line, ensuring that the specimen is axially tensioned during the test, avoiding eccentric tension, and improving the accuracy of the test results.

[0018] This invention, when fixed, can also adjust the base by rotating it so that the strip adhesive on the specimen inside the specimen frame is in the same vertical plane as the clamp at the top of the tensile testing machine. This ensures that the substrate and the strip adhesive peel off in the same vertical plane during the test, avoiding the situation where the strip adhesive on the specimen is not in the same vertical plane as the clamp at the top of the tensile testing machine, which would cause the specimen to be twisted during the test and affect the accuracy of the test results. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the specimen fixing device according to an embodiment of the present utility model;

[0020] Figure 2 This is a schematic diagram of the base structure according to an embodiment of the present utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the specimen frame according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the pressure plate in an embodiment of the present utility model;

[0023] Figure 5 This is a schematic diagram of the specimen's structure.

[0024] Meaning of the labels in the attached diagram:

[0025] 1-Base; 101-Connector; 102-Guide rail; 103-Bearing; 104-Connecting hole; 2-Specimen frame; 201-Guide groove; 202-Slide groove; 203-Substrate through hole; 204-Threaded hole on back plate; 205-Strip adhesive through hole; 206-Back plate; 207-Front end; 3-Pressure plate; 301-Threaded hole on pressure plate; 302-Slider; 303-Connecting part; 4-Specimen; 401-Substrate; 402-Structural sealant; 403-Strip adhesive. Detailed Implementation

[0026] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments, so that those skilled in the art can better understand and implement the technical solution of this utility model.

[0027] like Figure 1As shown, a specimen fixing device used in the adhesion test between substrate and structural sealant in this embodiment includes a base 1, a specimen frame 2, a connector 101 for connection with a tensile testing machine, at least one pressure plate 3 and a threaded rod (the threaded rod is not shown in the figure, only one pressure plate 3 is shown in the figure). The number of pressure plates 3 installed on the specimen frame 2 can be selected according to the size of the substrate 401 of the specimen 4 to be fixed. During the test, the specimen 4 to be tested will be fixed in the specimen frame 2.

[0028] like Figure 2 As shown, the base 1 is a metal plate, and the connecting member 101 is a connecting rod. The connecting rod is rotatably connected to the lower center of the base 1 via a bearing 103. The connecting rod has a connecting hole 104, which allows it to be fixedly connected to the lower connecting seat of the tensile testing machine. After the base 1 is fixed to the tensile testing machine via the connecting member 101, the base 1 can rotate in the horizontal plane. A set of horizontal guide rails 102 are provided on the top of the base 1, and the two guide rails 102 are parallel.

[0029] like Figure 3 As shown, the specimen frame 2 has a front port 207 at the front and a back plate 206 at the rear, with an interior space for accommodating the specimen 4. The bottom of the specimen frame 2 has two parallel guide grooves 201, which are slidably connected to the guide rail 102, allowing the specimen frame 2 to slide horizontally on the base 1. Vertical sliding grooves 202 are provided on both sides of the specimen frame 2 near the front port 207, with the upper end of the sliding grooves 202 extending through the top of the specimen frame 2. The sliding grooves 202 are used for the sliding installation of the pressure plate 3, allowing the pressure plate 3 mounted on the specimen frame 2 to slide up and down for adjustment.

[0030] Meanwhile, a substrate through-hole 203 is provided on the side of the specimen frame 2 near the back plate 206, extending horizontally through the specimen frame 2. In this embodiment, the substrate through-hole 203 is a rectangular hole, and substrate through-holes 203 are provided on both sides of the specimen frame 2. For specimens 4 with excessively long substrates 401, i.e., the length of substrate 401 is greater than the width of the specimen frame 2, the substrate 401 of specimen 4 can be passed through the substrate through-hole 203 during fixing, so as to fix the excessively long specimens 4.

[0031] A strip adhesive strip exit hole 205 is provided on the top of the specimen frame 2. The strip adhesive strip exit hole 205 is a strip-shaped hole extending from front to back, and the rear end of the strip adhesive strip exit hole 205 passes through the rear of the specimen frame 2. During the test, the strip adhesive strip 403 fixed on the specimen 4 inside the specimen frame 2 can pass upward through the strip adhesive strip exit hole 205 to the top of the specimen frame 2, and the clamp at the upper end of the tensile testing machine can clamp the strip adhesive strip 403 that has passed through to the top of the specimen frame 2.

[0032] like Figure 4As shown, the pressure plate 3 has connecting portions 303 that are bent vertically to one side at both ends. Each connecting portion 303 has a slider 302 that protrudes inward. The slider 302 can slide in the groove 202. When the pressure plate 3 is installed, the slider 302 enters the groove 202 from the upper port of the groove 202 to achieve a sliding connection.

[0033] Multiple threaded holes are provided on the pressure plate 3 and the back plate 206 respectively. The specific number of threaded holes 301 on the pressure plate and 204 on the back plate can be designed according to actual needs. In this embodiment, the threaded holes are arranged neatly in a matrix. The threaded rod can be connected in the threaded hole. The specimen 4 can be fixedly clamped in the specimen frame 2 by the inner end of the threaded rod abutting against the substrate 401 of the specimen 4.

[0034] like Figure 5 As shown, the specimen 4 used for the adhesion test mainly includes a substrate 401 used in actual engineering, a structural sealant 402, and a strip adhesive sheet 403. The substrate 401 may have various sizes, styles, and materials. The structural sealant 402 is coated on the substrate 401, and one end of the strip adhesive sheet 403 is adhered to the substrate 401 by the structural sealant 402. The strip adhesive sheet 403 is made of a soft material, such as metal mesh or metal sheet.

[0035] The usage process of the specimen fixing device in this embodiment is as follows:

[0036] When the size of the substrate 401 of the specimen 4 is smaller than the size of the specimen frame 2, the specimen 4 is placed into the specimen frame 2 from the front port 207, and the bonding position of the strip adhesive 403 to the substrate 401 corresponds to the position of the strip adhesive through hole 205. Then, the pressure plate 3 is installed on the specimen frame 2, and a threaded rod is connected in the threaded hole 301 on the pressure plate. The inner end of the threaded rod abuts against the substrate 401 of the specimen 4, and the back of the substrate 401 will be tightly abutted against the back plate 206, thereby clamping the substrate 401 in the specimen frame 2. The strip adhesive 403 bonded to the substrate 401 then passes upward through the strip adhesive through hole 205 above. Depending on the size and style of the substrate 401 of the specimen, threaded rods can be connected to the threaded holes 204 on the back plate to clamp and fix the substrate 401 of the specimen. For example, the substrate 401 can be clamped between the threaded rod in the threaded hole of the pressure plate 3 and the threaded rod in the threaded hole of the back plate. Depending on the size and style of the substrate 401 of the specimen, different numbers of pressure plates 3 can also be selected. The more pressure plates 3 there are, the larger the coverage area will be, and the larger and more complex specimens 4 can be clamped and fixed.

[0037] When the size of the substrate 401 of the specimen 4 is too large, usually when the length of the substrate 401 is too long, the substrate 401 can be passed through the substrate through hole 203, and the bonding position of the strip adhesive sheet 403 to the substrate 401 corresponds to the position of the strip adhesive sheet through hole 205. Then, a pressure plate 3 is installed on the specimen frame 2, and a threaded rod is connected in the threaded hole 301 on the pressure plate. The inner end of the threaded rod abuts against the substrate 401 of the specimen 4, and the back of the substrate 401 will be tightly pressed against the back plate 206, thereby clamping the substrate 401 in the specimen frame 2. The strip adhesive sheet 403 bonded to the substrate 401 then passes upward through the strip adhesive sheet through hole 205 above.

[0038] After fixing specimen 4 onto specimen frame 2, it can then be mounted on the tensile testing machine for testing. First, connect connector 101 to the lower connecting seat of the tensile testing machine. Rotate the adjusting base 1 so that the strip adhesive 403 is on the same vertical plane as the upper clamp of the tensile testing machine. Clamp the strip adhesive 403, which extends onto specimen frame 2, through the upper clamp of the tensile testing machine. During the clamping process, horizontally slide and adjust specimen frame 2 so that the connection position of connector 101 to the lower connecting seat of the tensile testing machine and the connection position of the strip adhesive 403 on specimen 4 to the upper clamp of the tensile testing machine are on the same plumb line. Finally, the adhesion test of specimen 4 can be performed by tensile testing of the tensile testing machine.

[0039] The above embodiments of this utility model are not intended to limit the scope of protection of this utility model. The implementation of this utility model is not limited thereto. All other modifications, substitutions or alterations made to the above structure of this utility model based on the above content of this utility model and in accordance with the common technical knowledge and conventional means in the field, without departing from the basic technical idea of ​​this utility model, shall fall within the scope of protection of this utility model.

Claims

1. A specimen fixing device used in a test of the adhesion between a substrate and a structural sealant, characterized in that: The device includes a base, a specimen frame, a connector for connection to a tensile testing machine, at least one pressure plate, and a threaded rod. The connector is rotatably connected to the lower center of the base. The specimen frame is horizontally slidably connected to the upper part of the base. The specimen frame has a front port and a rear plate at its front and rear, respectively. The specimen frame has a substrate through-hole that extends laterally through the specimen frame on its side near the rear plate. The specimen frame has a strip-shaped adhesive through-hole on its top. The pressure plate is slidably mounted at the front port of the specimen frame. The pressure plate and the rear plate each have multiple threaded holes, and the threaded rod is used to connect to the threaded holes.

2. The specimen fixing device for use in the adhesion test between substrate and structural sealant according to claim 1, characterized in that: The specimen frame has a vertical groove on its side near the front port, the upper end of the groove extends through the top of the specimen frame, and the pressure plate has sliders at both ends, which are slidably connected in the groove.

3. The specimen fixing device for use in the adhesion test between substrate and structural sealant according to claim 2, characterized in that: The pressure plate has connecting parts that are bent to one side at both ends, and the slider is disposed on the connecting parts.

4. The specimen fixing device according to claim 1 for use in the adhesion test between substrate and structural sealant, characterized in that: The connector includes a connecting rod, which is rotatably connected to the lower center of the base via a bearing, and the connecting rod has a connecting hole.

5. The specimen fixing device according to claim 1 for use in the adhesion test between substrate and structural sealant, characterized in that: The base is provided with a horizontal guide rail on its upper part, and the specimen frame is provided with a guide groove on its lower part. The guide groove is slidably connected to the guide rail.

6. The specimen fixing device according to claim 1 for use in the adhesion test between substrate and structural sealant, characterized in that: The through-hole in the substrate is a rectangular hole.

7. The specimen fixing device according to claim 1 for use in the adhesion test between substrate and structural sealant, characterized in that: The strip adhesive patch through-hole is a strip-shaped hole that extends from front to back, and the rear end of the strip adhesive patch through-hole passes through the rear of the specimen frame.

8. The specimen fixing device according to claim 1 for use in the adhesion test between substrate and structural sealant, characterized in that: The base is a metal plate.

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