A loading device for a universal testing machine

Abstract

This utility model discloses a loading device for a universal testing machine, relating to the field of building material performance testing equipment. It includes a concrete fixing frame and a steel bar fixing assembly located at the top of the concrete fixing frame. The concrete fixing frame includes a base plate with openings, a first side frame, a second side frame, and a height limiting frame. The first and second side frames are respectively located on both sides of the base plate, and the height limiting frame is connected to the first and second side frames and the base plate. The steel bar fixing assembly includes at least two adjusting plates for clamping steel bars, at least two adjusting rods for adjusting the position of the adjusting plates, and several adjusting holes located inside the height limiting frame for inserting the adjusting rods. The adjusting rods pass through the adjusting plates and are fixedly connected to them. Using this utility model, operation is convenient, the fixing effect is good, and eccentric force is less likely to occur.

Description

Technical Field

[0001] This utility model relates to the field of building material performance testing equipment, and in particular to a loading device for a universal testing machine. Background Technology

[0002] Reinforced concrete structures are widely used in modern construction, and the bond performance between steel reinforcement and concrete is a key factor affecting structural safety and durability. Accurately determining the bond strength and slip properties between steel reinforcement and concrete is of great significance for assessing structural reliability and guiding engineering design.

[0003] However, existing reinforced concrete pull-out devices have some shortcomings. For example, the loading device of the universal testing machine is complex to operate when placing the reinforcing steel and concrete. The reinforcing steel and the loading device usually need to be fixed with screws and bolts, which is time-consuming and labor-intensive, and prone to poor fixing results. Furthermore, because the reinforcing steel and the formed concrete are not perpendicular, eccentric forces can easily occur during the test, affecting the test results.

[0004] Therefore, there is an urgent need to design a loading device for universal testing machines that can stably fix reinforcing bars and is easy to use. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a loading device for a universal testing machine that is easy to operate, has a good fixing effect, and is not prone to eccentric force.

[0006] To address the aforementioned technical problems, this utility model provides a loading device for a universal testing machine, comprising a concrete fixing frame and a rebar fixing assembly disposed on top of the concrete fixing frame; the concrete fixing frame includes a base plate with openings, a first side frame, a second side frame, and a height limiting frame; the first side frame and the second side frame are respectively disposed on both sides of the base plate, and the height limiting frame is connected to the first side frame, the second side frame, and the base plate. The rebar fixing assembly includes at least two adjusting plates for clamping rebars, at least two adjusting rods for adjusting the position of the adjusting plates, and a plurality of adjusting holes disposed inside the height limiting frame for inserting the adjusting rods; the adjusting rods pass through the adjusting plates and are fixedly connected to them.

[0007] As an improvement to the above solution, a material replacement port for replacing steel bars of different thicknesses is provided at the top center of the first side frame.

[0008] As an improvement to the above solution, the height restriction frame includes a top plate and four columns located at the four corners of the top plate and connected to the bottom plate. The top plate has an opening, and the opening direction of the opening is towards the material exchange port.

[0009] As an improvement to the above solution, at least one of the adjustment plates is provided in the top plates on the two non-adjacent sides of the opening.

[0010] As an improvement to the above solution, one end of the adjusting piece is arc-shaped, and the adjusting pieces located on different sides of the opening have arc-shaped ends facing each other and are axially symmetrical.

[0011] As an improvement to the above solution, an anti-pull-out ring is provided in the middle of the adjusting rod. The anti-pull-out ring is located between the adjusting plate and the adjusting hole, and the radius of the anti-pull-out ring is greater than the radius of the opening and the radius of the adjusting hole.

[0012] As an improvement to the above solution, the adjustment holes are evenly arranged along the extension and retraction direction of the adjustment plate, and the cross-sectional size of the adjustment holes is the same as that of the adjustment rod.

[0013] As an improvement to the above solution, a handle is provided at the top of the adjusting rod.

[0014] As an improvement to the above solution, a pull-up member is also provided below the base plate, which is used to connect to the universal testing machine.

[0015] The beneficial effects of implementing this utility model are as follows:

[0016] In this invention, a concrete fixing frame is provided to fix the concrete specimen onto the loading device. An opening is provided in the base plate of the concrete fixing frame, allowing the reinforcing bar to pass through and be cast together with the concrete before being placed within the frame. By providing a reinforcing bar fixing device and adjusting the bar according to its thickness by inserting an adjusting rod into an adjusting hole, the adjusting plate clamps the reinforcing bar. This makes it easier for the user to install the reinforcing bar during pull-out tests on a universal testing machine, ensuring the bar is inserted vertically into the uncured concrete and preventing the test results from being affected by eccentric stress on the reinforcing bar. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the loading device of this utility model for a universal testing machine;

[0018] Figure 2 This is a schematic diagram of the loading device of this utility model for a universal testing machine from another perspective.

[0019] Figure 3 This is a schematic diagram of the installation of the steel bar fixing component of the loading device for a universal testing machine according to this utility model;

[0020] Figure 4 This is a schematic diagram of the installation of the auxiliary tensioning component of the loading device for a universal testing machine according to this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0022] See Figure 1 , Figure 2 and Figure 3 , Figure 1 , Figure 2 and Figure 3 The present invention illustrates the specific structure of the loading device for a universal testing machine, including a concrete fixing frame 1 and a steel bar fixing assembly 2 disposed on the top of the concrete fixing frame 1. The concrete fixing frame 1 includes a base plate 11 with openings 111, a first side frame 12, a second side frame 13, and a height limiting frame 14. The first side frame 12 and the second side frame 13 are respectively disposed on both sides of the base plate 11, and the height limiting frame 14 is connected to the first side frame 12, the second side frame 13, and the base plate 11. The steel bar fixing assembly 2 includes at least two adjusting plates 21 for clamping steel bars, at least two adjusting rods 22 for adjusting the position of the adjusting plates 21, and several adjusting holes 23 disposed inside the height limiting frame 14 for inserting the adjusting rods 22. The adjusting rods 22 pass through the adjusting plates 21 and are fixedly connected to them.

[0023] It should be noted that by setting the concrete fixing frame 1 as a base plate 11, a first side frame 12, a second side frame 13, and a height limiting frame 14, the size of the concrete specimen to be cast can be effectively limited. An opening 111 is provided in the base plate 11 so that the reinforcing bar can pass through the base plate 11 and be cast together with the concrete specimen. The movement of the adjusting rod 22 moves the adjusting plate 21. After the adjusting plate 21 finds a position to clamp the reinforcing bar, the adjusting rod 22 is inserted into the adjusting hole 23. This makes it easier for the user to install the reinforcing bar during the universal testing machine pull-out test, allowing the reinforcing bar to be inserted vertically into the uncured concrete, ensuring that the test results are not affected by the eccentric force on the reinforcing bar.

[0024] Specifically, the top center of the first side frame 12 is provided with a material exchange port 121 for replacing steel bars of different thicknesses, so that the tester can take out the steel bars that have completed the test after the test.

[0025] Specifically, the height restriction frame 14 includes a top plate 141 and four uprights 142 located at the four corners of the top plate 141 and connected to the bottom plate 11. The top plate 141 has an opening 143, with the opening of the opening 143 facing the material exchange port 121. By setting up the height restriction frame 14, it is ensured that the user will not place an excessively large mold, thus avoiding poor testing results of the universal testing machine due to the excessive volume of the concrete after molding. After the reinforcing bar passes through the opening 111 on the bottom plate 11, it passes through the opening 143 on the top plate 141. Therefore, facing the opening 143 towards the material exchange port 121 makes it easier to remove the tested reinforcing bar.

[0026] Preferably, at least one adjusting piece 21 is provided in the top plate 141 on each of the non-adjacent sides of the opening 143 to clamp the reinforcing bar from two opposite radial directions.

[0027] In this embodiment, two adjusting plates 21 are provided in the top plate 141 on one side, and one adjusting plate 21 is provided on the other side. However, the horizontal heights of the three adjusting plates 21 are not the same, so as to achieve a better clamping effect.

[0028] It should be noted that if only one adjusting plate 21 is provided on each of the non-adjacent sides of the opening 143, the horizontal height of the two adjusting plates 21 must be the same to ensure that the reinforcing bars are not subjected to eccentric stress.

[0029] Preferably, the middle part of one end of the adjusting piece 21 is arc-shaped, and the adjusting pieces 21 located on different sides of the opening 143 have arc-shaped ends facing each other and are axially symmetrical, so that they are similar to the curvature of the reinforcing bar, so as to ensure the quality of clamping the reinforcing bar.

[0030] It should be noted that one adjusting rod 22 can also control multiple adjusting plates 21 in the same vertical direction at the same time.

[0031] Preferably, the adjusting rod 22 is provided with an anti-pull-out ring 221 in the middle. The anti-pull-out ring 221 is located between the adjusting plate 21 and the adjusting hole 23, and the radius of the anti-pull-out ring 221 is larger than the radius of the opening 111 and the radius of the adjusting hole 23. By providing the anti-pull-out ring 221, the user is prevented from using excessive force to pull the adjusting rod 22 out of the adjusting plate 21 when adjusting it from one adjusting hole 23 to another.

[0032] It should be noted that when the same adjusting rod 22 needs to control multiple adjusting plates 21, it is only necessary to set an anti-pull-out ring 221 between the lowest adjusting plate 21 and the adjusting hole 23.

[0033] See Figure 3 The adjusting holes 23 are evenly arranged along the extension and retraction direction of the adjusting plate 21 so that the position of the adjusting plate 21 can be adjusted according to the thickness of the reinforcing bar in its extension and retraction direction.

[0034] Preferably, the top of the adjusting rod 22 is provided with a handle 222, so that the user can easily control the adjusting rod 22.

[0035] See Figure 4 Below the base plate 11, there is also a tensioning component 112, which is used to connect with the universal testing machine so that the tension of the universal testing machine can be evenly distributed on the base plate 11.

[0036] As can be seen from the above, the loading device of this utility model for a universal testing machine, by setting a base plate 11, a first side frame 12, a second side frame 13, and a height limiting frame 14, allows the concrete to be stably fixed on the concrete fixing frame 1. By setting an adjusting plate 21, an adjusting rod 22, and an adjusting hole 23, the adjusting rod 22 is inserted into the adjusting hole 23, and the adjusting plate 21 clamps the reinforcing bar, so that the reinforcing bar can be vertically inserted into the uncured concrete, ensuring that the test results are not affected by the eccentric force on the reinforcing bar. In addition, by setting a material replacement port 121 and an opening 143, it is easier to replace the reinforcing bar after the test. By setting one end of the adjusting plate 21 to be arc-shaped and axially symmetrical, it is easier to clamp the reinforcing bar and less likely to slip. Furthermore, by setting a handle 222, the adjusting rod 22 is easier for the user to control.

[0037] In actual use, the mold is placed between the base plate 11 and the height restriction frame 14. The reinforcing bar is inserted through the opening 111 in the base plate 11 and fixed using the reinforcing bar fixing component 2. Then, concrete is poured into the mold to bond with the reinforcing bar. After the concrete has solidified into a block, a pull-out test is performed using a universal testing machine. After the concrete and reinforcing bar have solidified into a block, the position of the adjusting rod 22 needs to be adjusted so that the adjusting plate 21 no longer clamps the reinforcing bar, thus preventing damage to the reinforcing bar fixing device 2 during the pull-out test.

[0038] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this invention, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A loading device for a universal testing machine, characterized in that, Includes a concrete fixed frame and a steel reinforcement fixing assembly located on top of the concrete fixed frame; The concrete fixing frame includes a base plate with openings, a first side frame, a second side frame, and a height limiting frame; the first side frame and the second side frame are respectively located on both sides of the base plate, and the height limiting frame is connected to the first side frame, the second side frame, and the base plate. The rebar fixing assembly includes at least two adjusting plates for clamping the rebar, at least two adjusting rods for adjusting the position of the adjusting plates, and several adjusting holes provided inside the height restriction frame for inserting the adjusting rods. The adjusting rods pass through the adjusting plates and are fixedly connected to them.

2. The loading device for a universal testing machine as described in claim 1, characterized in that, The top center of the first side frame has a material replacement port for replacing steel bars of different thicknesses.

3. The loading device for a universal testing machine as described in claim 2, characterized in that, The height restriction frame includes a top plate and four columns located at the four corners of the top plate and connected to the bottom plate. The top plate has an opening, and the opening direction of the opening is towards the material exchange port.

4. The loading device for a universal testing machine as described in claim 3, characterized in that, At least one adjustment piece is provided in the top plate on each of the two non-adjacent sides of the opening.

5. The loading device for a universal testing machine as described in claim 4, characterized in that, The middle part of one end of the adjustment piece is arc-shaped, and the adjustment pieces located on different sides of the opening have arc-shaped ends facing each other and are axially symmetrical.

6. The loading device for a universal testing machine as described in claim 1, characterized in that, The adjusting rod is provided with an anti-pull-out ring in the middle. The anti-pull-out ring is located between the adjusting plate and the adjusting hole. The radius of the anti-pull-out ring is greater than the radius of the opening and the radius of the adjusting hole.

7. The loading device for a universal testing machine as described in claim 1, characterized in that, The adjustment holes are evenly arranged along the extension and retraction direction of the adjustment plate, and the cross-sectional size of the adjustment holes is the same as that of the adjustment rod.

8. The loading device for a universal testing machine as described in claim 1, characterized in that, The adjusting rod has a handle at the top.

9. The loading device for a universal testing machine as described in claim 1, characterized in that, A tensioning component is also provided below the base plate, which is used to connect to the universal testing machine.

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