A tensile clamp for a plastering mortar testing machine

Abstract

The application relates to the technical field of building material detection equipment, in particular to a tensile clamp for a plastering gypsum mortar testing machine, a test block comprises a base layer test piece and a test piece, the test block is in a stepped shape, and the test piece is fixedly bonded on the base layer test piece; the tensile clamp comprises oppositely arranged upper and lower clamps; the lower clamp is used for fixing the base layer test piece, the upper clamp comprises a connecting rod, a fixed plate and a limiting piece, the connecting rod is threadedly connected with the fixed plate, and the fixed plate is fixedly bonded with the test piece through strong glue; the limiting piece is arranged on the bonding surface of the fixed plate, and the limiting piece is oppositely arranged on the two sides of the fixed plate; when the fixed plate abuts against the base layer test piece, the fixed plate extrudes the strong glue with the test piece. In the application, the limiting piece is arranged on the outside of the fixed plate to constrain the distance between the bonding surface in the fixed plate and the test piece, so that the balance of the bonding force of the fixed plate and the test piece is improved.

Description

Technical Field

[0001] This application relates to the field of building material testing equipment technology, and in particular to a tensile clamp for a plaster mortar testing machine. Background Technology

[0002] Before using plaster mortar, it is necessary to conduct a tensile bond strength test to verify the reliability of the bond between the plaster mortar and the substrate (such as concrete, bricks, cement mortar, etc.). This is directly related to the construction quality, structural safety and long-term durability of the plastering project, and is a key prerequisite to avoid problems such as hollow walls, cracks and peeling in the later stages.

[0003] The tensile testing machine (also known as the tensile testing module of the universal testing machine) is a core piece of equipment used to test the tensile, peel, tear and other mechanical properties of materials. It can be used to test the tensile bond strength of plaster mortar.

[0004] In existing technology, the plaster mortar to be tested is applied to a substrate specimen (such as concrete, brick, cement mortar, etc.) to form a test specimen. The tensile testing machine's tensile clamps include a lower clamp and an upper clamp. The lower clamp is used to fix the substrate specimen, and the upper clamp is bonded to the test specimen. Subsequently, the tensile testing machine applies a uniform tensile force, causing the lower clamp and upper clamp to separate. After the interface between the test specimen and the substrate specimen fails, the maximum load value at this point is recorded. Finally, based on the recorded maximum load and the bond area of ​​the specimen, the tensile bond strength is calculated and compared with national standards to determine whether it is qualified.

[0005] In the existing technology, a strong adhesive is first applied to the upper clamp, and then the upper clamp is inverted onto the test piece. By squeezing the upper clamp, the upper clamp and the test piece are bonded and fixed together by the strong adhesive. However, in the above operation, there are problems such as uneven application of the strong adhesive and uneven squeezing by the operator, which results in a large difference in the adhesion between different test pieces and the upper clamp. This leads to a large difference in different test data and affects the accuracy of the test results. Utility Model Content

[0006] To improve the accuracy of tensile bond test data for plaster mortar, this application provides a tensile fixture for a plaster mortar testing machine.

[0007] This application provides a tensile clamp for a plaster mortar testing machine, which adopts the following technical solution: A tensile clamp for a plaster mortar testing machine includes a test block comprising a base specimen and a test specimen. The test block is stepped, and the test specimen is bonded and fixed to the base specimen. It includes an upper clamp and a lower clamp arranged opposite to each other. The lower clamp is used to fix the base specimen. The upper clamp includes a connecting rod, a fixing plate, and a limiting member. The connecting rod is threadedly connected to the fixing plate, and the fixing plate is bonded and fixed to the test specimen with strong adhesive. The limiting member protrudes from the bonding surface of the fixing plate and is arranged opposite to each other on both sides of the fixing plate. When the fixing plate abuts against the base specimen, the fixing plate and the test specimen compress the strong adhesive.

[0008] By adopting the above technical solution, limiting components are set on the outside of the fixing plate to constrain the distance between the bonding surface in the fixing plate and the test piece; thereby improving the uniformity of the bonding force between the fixing plate and the test piece, reducing the gap between the measurement data of different batches of test pieces, and improving the accuracy of the test data of the test piece.

[0009] Optionally, the base specimen is provided with a limiting groove, and the limiting member is inserted into the limiting groove.

[0010] By adopting the above technical solution, the limiting groove is used to constrain the limiting component, thereby reducing the horizontal sliding of the fixing plate when the worker presses it down, which makes it easier for the worker to operate.

[0011] Optionally, a clearance distance is provided between the limiting member and the test piece.

[0012] By adopting the above technical solution, a clearance distance is provided between the limiting component and the test piece to facilitate the application of strong adhesive by the staff on the fixing plate.

[0013] Optionally, the limiting member is a limiting post, and the limiting member is disposed around the perimeter of the fixing plate.

[0014] By adopting the above technical solution, the limiting component is a limiting post, thereby reducing its volume. This minimizes the impact on workers when applying strong adhesive to the fixing plate. Furthermore, the limiting component's placement around the perimeter of the fixing plate improves its installation stability.

[0015] Optionally, the limiting member is threadedly connected to the fixing plate.

[0016] By adopting the above technical solution, the limiting component is threadedly connected to the fixing plate, so that the operator can first apply strong adhesive to the fixing plate, then thread the limiting component to the fixing plate, and finally invert the fixing plate onto the test piece, so as to facilitate the operator's operation.

[0017] Optionally, the adhesive surface of the fixing plate is provided with a positioning coil, the vertical projection of the positioning coil covers the test piece, and the adhesive is strongly applied to the positioning coil.

[0018] By adopting the above technical solution, positioning coils are set on the bonding surface of the fixing plate to facilitate the worker to fully apply strong adhesive to the bonding area of ​​the fixing plate; thereby improving the bonding strength between the fixing plate and the test piece, as well as the uniformity of the bonding force between the fixing plate and the test piece.

[0019] Optionally, the lower clamp includes a fixed base with a horizontally penetrating fixed groove for accommodating the base layer specimen. The side wall of the fixed groove is provided with a limiting ear plate, which is located at the opening of the fixed groove. When the upper and lower clamps are relatively far apart from the lower clamp, the limiting ear plate abuts against the base layer specimen to fix the position of the base layer specimen.

[0020] By adopting the above technical solution, limiting ear plates are set on the side wall of the fixed groove, which makes it easier for workers to install test blocks.

[0021] Optionally, the lower clamp further includes a limiting ring, which is disposed between the limiting ear plate and the base specimen, and the limiting ring is sleeved on the outer periphery of the test specimen; when the upper and lower clamps are relatively far apart from the lower clamp, one side of the limiting ring abuts against the limiting ear plate, and the other side of the limiting ring abuts against the base specimen.

[0022] By adopting the above technical solution, and by setting a limiting ring between the fixed seat and the base specimen, the contact area between the lower fixture and the base specimen is increased, the uniformity of the force on the base specimen is improved, and the accuracy of the test data is improved.

[0023] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting limiting components on the outside of the fixing plate, the distance between the bonding surface in the fixing plate and the test piece is constrained; thereby improving the uniformity of the bonding force between the fixing plate and the test piece, reducing the gap between the measurement data of different batches of test pieces, and improving the accuracy of the test data of the test piece; 2. By using the limiting groove to constrain the limiting component, the horizontal sliding of the fixing plate can be reduced when the operator presses it down, thus facilitating the operator's operation; 3. The limiting component is threadedly connected to the fixing plate, so that the operator can first apply strong adhesive to the fixing plate, then thread the limiting component to the fixing plate, and finally invert the fixing plate onto the test piece for easy operation. Attached Figure Description

[0024] Figure 1This is a schematic diagram of the specimen structure in this embodiment.

[0025] Figure 2 This is a schematic diagram of the specimen preparation structure in this embodiment.

[0026] Figure 3 This is a schematic diagram of the tension clamp in this embodiment.

[0027] Figure 4 yes Figure 3 Enlarged view of point A in the middle.

[0028] Figure 5 This is a schematic diagram of the upper clamp in this embodiment.

[0029] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0030] Figure 7 This is a cross-sectional view of the tension clamp in this embodiment.

[0031] Figure 8 This is a schematic diagram of the lower clamp in this embodiment.

[0032] Explanation of reference numerals in the attached drawings: 1. Test block; 11. Base layer test piece; 111. Limiting groove; 12. Test piece; 2. Upper clamp; 21. Connecting rod; 22. Fixing plate; 221. Positioning coil; 23. Limiting component; 3. Lower clamp; 31. Fixing seat; 311. Fixing groove; 312. Limiting ear plate; 32. Limiting ring; 4. Strong adhesive; 5. Molding frame. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 -8 provides further details regarding this application.

[0034] This application discloses a tensile clamp for a plaster mortar testing machine. (Refer to...) Figure 1 The test block 1 includes a base specimen 11 and a test specimen 12. The test block 1 is stepped, and the test specimen 12 is bonded and fixed to the base specimen 11. Both the base specimen 11 and the test specimen 12 are cuboid structures. In this embodiment, the cross-section of both the base specimen 11 and the test specimen 12 is square.

[0035] Reference Figure 2In this embodiment, the base specimen 11 is cast from cement mortar; in other embodiments, the base specimen 11 may also be a brick or the like. After the base specimen 11 has solidified and hardened, a molding frame 5 is placed on the base specimen 11. The molding frame 5 may be made of silicone material. Subsequently, the prepared plaster mortar is poured into the molding frame 5, and the plaster mortar solidifies and hardens to form the test specimen 12. Finally, the surface mortar of the test specimen 12 is sanded off with sandpaper to complete the preparation of the specimen.

[0036] Reference Figure 3 and Figure 4 The tensile fixture used in the plaster mortar testing machine includes an upper fixture 2 and a lower fixture 3 arranged opposite to each other; the lower fixture 3 is used to fix the base specimen 11, and the upper fixture 2 is used to fix the test specimen 12. It is worth noting that the bonding strength between the fixing plate 22 and the test specimen 12 is much greater than the bonding strength between the test specimen 12 and the base specimen 11, to ensure that after the specimen is subjected to tensile force, the interface between the test specimen 12 and the base specimen 11 will break.

[0037] In existing technology, the drive system of the testing machine pulls the upper clamp 2 and the lower clamp 3 to apply tensile force to the cross-section of the test specimen 12 and the base specimen 11. After the interface between the test specimen 12 and the base specimen 11 fails, the maximum load value at this time is recorded. Finally, based on the recorded maximum load and the bonding area of ​​the specimen, the tensile bond strength is calculated and compared with the national standard to determine whether it is qualified. In existing technology, testing machines for testing tensile bond strength are widely used, and this application will not elaborate on other specific structures of the testing machine.

[0038] Reference Figure 5 and Figure 6 The upper clamp 2 includes a connecting rod 21, a fixing plate 22, and a limiting member 23. The connecting rod 21 is threadedly connected to the fixing plate 22, and the fixing plate 22 is bonded and fixed to the test piece 12 by strong adhesive 4. The limiting member 23 is set to protrude from the bonding surface of the fixing plate 22, and the limiting member 23 is set opposite to the two sides of the fixing plate 22. When the fixing plate 22 abuts against the base specimen 11, the fixing plate 22 and the test piece 12 squeeze the strong adhesive 4.

[0039] Reference Figure 6 The bonding surface of the fixing plate 22 is provided with a positioning coil 221, the vertical projection of which covers the test piece 12. By setting the positioning coil 221 on the bonding surface of the fixing plate 22, it is easier for the operator to fully apply the strong adhesive 4 to the bonding area of ​​the fixing plate 22, thereby improving the bonding strength between the fixing plate 22 and the test piece 12, as well as the uniformity of the bonding force between the fixing plate 22 and the test piece 12. In this embodiment, the positioning coil 221 can be drawn with a scribing pen; in other embodiments, the positioning coil 221 can also be in the form of a positioning groove.

[0040] Reference Figure 5 and Figure 6 In this embodiment, the limiting member 23 is a limiting post, and the limiting member 23 is disposed around the perimeter of the fixing plate 22 to reduce the volume of the limiting member 23. This reduces the impact of the limiting member 23 on the worker when applying the strong adhesive 4 to the fixing plate 22. Furthermore, the placement of the limiting member 23 around the fixing plate 22 improves the stability of the fixing plate 22 during installation. In addition, a clearance distance is provided between the limiting member 23 and the test piece 12 to facilitate the worker applying the strong adhesive 4 to the fixing plate 22.

[0041] In this embodiment, the limiting member 23 is threadedly connected to the fixing plate 22; thus, the operator can first apply the strong adhesive 4 to the fixing plate 22, then thread the limiting member 23 to the fixing plate 22, and finally invert the fixing plate 22 onto the test piece 12 for easy operation. After the fixing plate 22 and the test piece 12 are bonded and fixed, one end of the connecting rod 21 is threadedly connected and fixed to the fixing plate 22; finally, the other end of the connecting rod 21 is fixed to the drive system of the testing machine.

[0042] Reference Figure 1 , Figure 4 and Figure 7 The base specimen 11 is provided with a limiting groove 111, and the limiting member 23 is inserted into the limiting groove 111. The limiting groove 111 constrains the limiting member 23, thereby reducing the horizontal sliding of the fixing plate 22 when the operator presses it down, which facilitates the operator's operation. It is worth noting that the limiting member 23 being inserted into the limiting groove 111 should be understood as a limitation on the length of the limiting member 23, that is, the length of the limiting member 23 must be greater than the height of the test specimen 12.

[0043] Reference Figure 7 and Figure 8 The lower clamp 3 includes a fixed base 31 and a limiting ring 32. The fixed base 31 has a horizontally penetrating fixed groove 311 for accommodating the base specimen 11. The side wall of the fixed groove 311 is provided with a limiting ear plate 312, which is located at the opening of the fixed groove 311. The limiting ring 32 is located between the limiting ear plate 312 and the base specimen 11, and is sleeved on the outer periphery of the specimen 12. When the upper and lower clamps 3 are relatively far apart from the lower clamp 3, one side of the limiting ring 32 abuts against the limiting ear plate 312, and the other side of the limiting ring 32 abuts against the base specimen 11.

[0044] Reference Figure 7 and Figure 8By setting a limiting ear plate 312 on the side wall of the fixed groove 311, it is easier for the staff to install the test block 1. By setting a limiting ring 32 between the fixed seat 31 and the base specimen 11, the contact area between the lower clamp 3 and the base specimen 11 is increased, the uniformity of the force on the base specimen 11 is improved, and the accuracy of the test data is improved.

[0045] The implementation principle of the tensile clamp for a plaster mortar testing machine in this application embodiment is as follows: Reference Figure 5 and Figure 7 By setting a limiting member 23 on the outside of the fixing plate 22 to constrain the distance between the adhesive surface in the fixing plate 22 and the test piece 12, the uniformity of the adhesive force between the fixing plate 22 and the test piece 12 can be improved when the fixing plate 22 and the test piece 12 are bonded and fixed, so as to reduce the gap between the measurement data of different batches of test pieces 12 and improve the accuracy of the test data of the test piece 12.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A tensile clamp for a plaster mortar testing machine, wherein the test block (1) comprises a base specimen (11) and a test specimen (12), the test block (1) being stepped, and the test specimen (12) being bonded and fixed to the base specimen (11); characterized in that: The device includes an upper clamp (2) and a lower clamp (3) arranged opposite to each other; the lower clamp (3) is used to fix the base specimen (11); the upper clamp (2) includes a connecting rod (21), a fixing plate (22) and a limiting member (23); the connecting rod (21) is threadedly connected to the fixing plate (22); the fixing plate (22) is bonded to the test specimen (12) by strong adhesive (4); the limiting member (23) is set to protrude from the bonding surface of the fixing plate (22); the limiting member (23) is arranged opposite to both sides of the fixing plate (22); when the fixing plate (22) abuts against the base specimen (11), the fixing plate (22) and the test specimen (12) squeeze the strong adhesive (4).

2. The tensile clamp for the plaster mortar testing machine according to claim 1, characterized in that: The base specimen (11) is provided with a limiting groove (111), and the limiting member (23) is inserted into the limiting groove (111).

3. The tensile clamp for the plaster mortar testing machine according to claim 2, characterized in that: A clearance distance is provided between the limiting component (23) and the test component (12).

4. The tensile clamp for the plaster mortar testing machine according to claim 3, characterized in that: The limiting member (23) is a limiting post, and the limiting member (23) is disposed around the fixing plate (22).

5. The tensile fixture for the plaster mortar testing machine according to claim 4, characterized in that: The limiting member (23) is threadedly connected to the fixing plate (22).

6. The tensile clamp for the plaster mortar testing machine according to claim 1, characterized in that: The adhesive surface of the fixing plate (22) is provided with a positioning coil (221), and the vertical projection of the positioning coil (221) covers the test piece (12), and is strongly adhesively applied to the positioning coil (221).

7. The tensile clamp for the plaster mortar testing machine according to claim 1, characterized in that: The lower clamp (3) includes a fixed seat (31), which has a horizontally penetrating fixed groove (311) for accommodating the base specimen (11). The side wall of the fixed groove (311) is provided with a limiting ear plate (312), which is located at the opening of the fixed groove (311). When the upper and lower clamps (3) are relatively far apart from the lower clamp (3), the limiting ear plate (312) is used to abut against the base specimen (11) to fix the position of the base specimen (11).

8. The tensile fixture for the plaster mortar testing machine according to claim 7, characterized in that: The lower clamp (3) also includes a limiting ring (32), which is disposed between the limiting ear plate (312) and the base specimen (11). The limiting ring (32) is sleeved on the outer periphery of the test specimen (12). When the upper and lower clamps (3) are relatively far away from the lower clamp (3), one side of the limiting ring (32) abuts against the limiting ear plate (312), and the other side of the limiting ring (32) abuts against the base specimen (11).

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