Testing device for durability of concrete

Abstract

The utility model relates to a testing device for concrete durability, which belongs to the technical field of concrete testing, and comprises a testing stand and a driving mechanism, the bottom of the driving mechanism is connected with a millstone through a measuring mechanism, and balls are mounted on the millstone. According to the utility model, through the arrangement of the measuring mechanism, the ball can be always contacted with the concrete test block under the action of the measuring mechanism in the process of testing the concrete test block after the ball and the concrete test block are descended in place by the driving mechanism, so that the ball does not need to be controlled to slowly move downwards through the driving mechanism in the testing process; according to the concrete test block wear test device, the wear test can be performed on the concrete test block, the depth of the groove generated by the wear of the concrete test block can be directly obtained when the wear test is completed, the measurement is accurate, the test is convenient, and the accuracy of test data is ensured, so that the accuracy of concrete durability measurement is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to concrete test technical field, concretely relates to a kind of test device for concrete durability. BACKGROUND

[0002] Abrasion resistance refers to the ability of cement concrete to resist surface film damage. Cement wear mainly occurs on the surface of pavement, pavement, concrete structure, etc., which is manifested as the wear and polishing of the surface by the tire of the wheel and the scouring of the dam surface and pier by high-speed water flow, etc. The damage to cement-based materials from the outside. Abrasion usually needs a certain period of accumulation to cause the final damage, so abrasion resistance belongs to durability. According to the working state of the surface abrasion of cement-based materials, it is generally divided into abrasion of over-flow surface and abrasion of non-over-flow surface. The over-flow surface mainly refers to the surface of concrete structure applied to hydraulic engineering. Because the surface of hydraulic concrete is subjected to long-term scouring by water flow, and hard particles are accompanied in the water flow, the abrasion resistance is represented by the ability to resist the scouring and abrasion of high-speed sand-containing water flow. The abrasion of the surface of non-over-flow cement-based materials mainly refers to the wear caused by mechanical abrasion of the material surface, which is usually represented by the abrasion amount.

[0003] At present, when the durability test of concrete is carried out by using ball bearing method, the ball bearing method will leave a ring-shaped groove on the surface of the concrete test block. When measuring the depth of the groove, the groove needs to be cleaned first to measure the depth of the groove. However, due to the arc shape of the groove, deviation may occur during measurement, resulting in deviation of the data measured for the durability of concrete. Based on this, a test device for concrete durability is proposed. UTILITY MODEL CONTENTS

[0004] The utility model aims to solve the above problems and provide a test device for concrete durability with simple structure and reasonable design.

[0005] The utility model realizes the above-mentioned purposes by the following technical solutions:

[0006] A test device for concrete durability, comprising a test bench and a driving mechanism, the bottom of the driving mechanism is connected with a grinding disc through a measuring mechanism, the grinding disc is provided with a ball, the top of the test bench is fixedly connected with a filter screen, the filter screen is fixedly connected with a limiting plate, the position of the concrete test block is limited by the limiting plate, the test bench is slidingly connected with a lifting mechanism, and the concrete test block moves up and down in the limiting plate under the action of the lifting mechanism.

[0007] As a further optimization of this utility model, the measuring mechanism includes a sleeve fixedly connected to the bottom of the output end of the drive mechanism, a slide rod slidably connected inside the sleeve, a measuring spring fixedly connected to the top of the slide rod, a measuring rod fixedly connected to the top of the slide rod, the measuring spring fixedly connected to the bottom of the output end of the drive mechanism and located inside the sleeve, and the slide rod fixedly connected to the top of the grinding disc.

[0008] As a further optimization of this utility model, the driving mechanism includes a cylinder installed on the top of the test bench, a lifting plate fixedly connected to the output end of the cylinder, a motor installed on the top of the lifting plate, a hollow rotating shaft fixedly connected to the output end of the motor, a fixed plate fixedly connected to the bottom of the hollow rotating shaft, a sleeve fixedly connected to the bottom of the fixed plate, a measuring spring fixedly connected to the bottom of the fixed plate, and a measuring rod passing through the fixed plate and slidably connected to the fixed plate.

[0009] As a further optimization of this utility model, a collar is rotatably connected to the outer surface of the hollow rotating shaft, and a water inlet pipe is fixedly connected to the collar. The water inlet of the hollow rotating shaft is located within the collar.

[0010] As a further optimization of this utility model, a collection box is fixedly connected to the bottom of the test bench, a drain pipe is fixedly connected to the bottom of the collection box, and a filter screen is set on the top of the collection box.

[0011] As a further optimization of this utility model, the lifting mechanism includes a lifting frame that passes through the test bench and is slidably connected to the test bench. The lifting frame is fixedly connected to the bottom of the lifting plate. A lifting rod is provided at the top of the lifting frame. A connecting frame is fixedly connected to the top of the lifting rod. A lifting rod is fixedly connected to the top of the connecting frame. The lifting rod passes through the filter screen and is slidably connected to the filter screen. The lifting rod passes through the collection box and is slidably connected to the collection box.

[0012] The beneficial effects of this utility model are as follows: By setting up a measuring mechanism, this utility model ensures that after the driving mechanism lowers the ball bearing and the concrete specimen into position, the ball bearing remains in contact with the concrete specimen under the action of the measuring mechanism during the test. This eliminates the need for the driving mechanism to control the ball bearing to move slowly downwards during the test, thus enabling wear testing of the concrete specimen. Furthermore, upon completion of the wear test, the depth of the grooves created by the wear on the concrete specimen can be directly determined, ensuring accurate measurement, facilitating testing, and guaranteeing the accuracy of the test data, thereby ensuring the accuracy of concrete durability measurement. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the frontal cross-section of this utility model;

[0015] Figure 3 This is the utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0016] Figure 4 This is a three-dimensional partial cross-sectional structural diagram of this utility model;

[0017] Figure 5 This is a schematic diagram of a three-dimensional partial cross-sectional structure of the bottom of the grinding disc and the fixed disc of this utility model.

[0018] In the diagram: 1. Test bench; 2. Cylinder; 3. Lifting plate; 4. Motor; 5. Hollow rotating shaft; 6. Fixed plate; 7. Measuring mechanism; 701. Sleeve; 702. Slide rod; 703. Measuring spring; 704. Measuring rod; 8. Grinding disc; 9. Ball bearing; 10. Collar; 11. Water inlet pipe; 12. Filter screen; 13. Collection box; 14. Drain pipe; 15. Limiting plate; 1601. Lifting frame; 1602. Lifting rod; 1603. Connecting frame; 1604. Lifting rod. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example

[0021] like Figures 1-5 As shown, a test device for concrete durability includes a test bench 1 and a drive mechanism. The bottom of the drive mechanism is connected to a grinding disc 8 via a measuring mechanism 7. Ball bearings 9 are installed on the grinding disc 8 and arranged in a circular array along the central axis of the grinding disc 8. A filter screen 12 is fixedly connected to the top of the test bench 1. Limiting plates 15 are fixedly connected to the filter screen 12. Four limiting plates 15 are provided, and the position of the concrete test block is restricted by the limiting plates 15. A lifting mechanism is slidably connected to the test bench 1. The concrete test block moves up and down within the limiting plates 15 under the action of the lifting mechanism. A collection box 13 is fixedly connected to the bottom of the test bench 1. A drain pipe 14 is fixedly connected to the bottom of the collection box 13. The filter screen 12 is located on the top of the collection box 13. A solenoid valve is installed in the drain pipe 14.

[0022] In use, first place the concrete test block on top of the lifting mechanism, ensuring it is within the limiting plate 15. Then, activate the drive mechanism to move it downwards, causing the ball bearing 9 to move downwards and the lifting mechanism to move the concrete test block downwards until it contacts the top of the filter screen 12. The measuring mechanism 7 is then under compression. At this point, read the initial reading of the measuring mechanism 7. Then, activate the drive mechanism again, causing the ball bearing 9 to rotate along the upper surface of the concrete test block via the measuring mechanism 7, thus conducting an abrasion durability test. During the test, the concrete test block will experience wear, and the measuring mechanism 7, being under compression, will keep the ball bearing 9 in constant contact with the concrete test block. Once the ball bearing 9 has rotated a specified number of times (1000 to 5000 times), the drive mechanism can be turned off, and the final reading on the measuring mechanism 7 can be read. The abrasion resistance of the concrete test block can then be calculated using the following formula: Among them, I a R represents the abrasion resistance, P represents the number of grinding head revolutions, and P represents the depth of the grinding groove (initial reading - final reading). Then, the abrasion resistance of the concrete test block is compared with the specified abrasion resistance to determine whether the durability of the concrete test block meets the requirements.

[0023] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the measuring mechanism 7 includes a sleeve 701 fixedly connected to the bottom of the output end of the drive mechanism. A slide rod 702 is slidably connected inside the sleeve 701. A measuring spring 703 is fixedly connected to the top of the slide rod 702. A measuring rod 704 is fixedly connected to the top of the slide rod 702. The outer surface of the measuring rod 704 is provided with a scale. The measuring spring 703 is fixedly connected to the bottom of the output end of the drive mechanism and is located inside the sleeve 701. The slide rod 702 is fixedly connected to the top of the grinding disc 8. The measuring mechanism 7 is arranged in a circular array along the central axis of the grinding disc 8.

[0024] During use, when the drive mechanism moves downwards and the concrete specimen is in contact with the top of the filter screen 12, the drive mechanism continues to move downwards. When the ball bearing 9 contacts the concrete specimen, the continued downward movement of the drive mechanism causes the slide rod 702 to slide upwards relative to the sleeve 701, compressing the measuring spring 703 until the drive mechanism can no longer move downwards. At this point, the measuring rod 704 extends out of the output end of the drive mechanism, allowing the initial reading to be read from the position of the measuring rod 704 above the output end of the drive mechanism. During the rotation of the drive mechanism, the sleeve 701 and slide rod 702 will drive the grinding disc 8 to rotate, which in turn drives the ball bearing 9 to rotate along the surface of the concrete specimen. During the rotation, the surface of the concrete specimen will wear down, and it will be in a compressed state. The measuring spring 703 pushes the slide bar 702 downwards, which in turn pushes the ball bearing 9 through the grinding disc 8 to maintain constant contact with the concrete specimen. Simultaneously, the measuring rod 704 slides downwards until it rotates a specified number of times. At this point, the final reading of the measuring rod 704 above the output end of the drive mechanism is read, thus determining the abrasion resistance of the concrete specimen. Furthermore, under the action of the measuring mechanism 7, the ball bearing 9 can always maintain contact with the concrete specimen, eliminating the need for the drive mechanism to slowly move the ball bearing 9 downwards during the test. This allows for the abrasion test of the concrete specimen without the need for the drive mechanism to control the ball bearing 9 to move downwards slowly. Moreover, upon completion of the abrasion test, the depth of the grooves created by the wear on the concrete specimen can be directly determined. The measurement is accurate, convenient for testing, and ensures the accuracy of the test data, thereby guaranteeing the accuracy of the concrete durability measurement.

[0025] like Figures 1-4 As shown, the driving mechanism includes a cylinder 2 mounted on the top of the test bench 1. A lifting plate 3 is fixedly connected to the output end of the cylinder 2. A motor 4 is mounted on the top of the lifting plate 3. A hollow rotating shaft 5 is fixedly connected to the output end of the motor 4. The bottom of the hollow rotating shaft 5 has an opening that communicates with the hollow part. A fixed plate 6 is fixedly connected to the bottom of the hollow rotating shaft 5. A through hole is opened in the middle of the fixed plate 6, and the through hole corresponds to the bottom opening of the hollow rotating shaft 5. A sleeve 701 is fixedly connected to the bottom of the fixed plate 6. A measuring spring 703 is fixedly connected to the bottom of the fixed plate 6. A measuring rod 704 passes through the fixed plate 6 and is slidably connected to the fixed plate 6. A collar 10 is rotatably connected to the outer surface of the hollow rotating shaft 5. A water inlet pipe 11 is fixedly connected to the collar 10. The water inlet pipe 11 is connected to an external water pump. The water inlet of the hollow rotating shaft 5 is located within the collar 10.

[0026] In use, firstly, cylinder 2 is activated, causing the lifting plate 3 to move downwards via the hollow rotating shaft 5 and measuring mechanism 7, driving the grinding disc 8 and ball bearings 9. During this process, the lifting mechanism operates, causing the concrete specimen to move downwards within the limiting plate 15 until the ball bearings 9 contact the top of the concrete specimen, compressing the measuring mechanism 7. Then, cylinder 2 is turned off, driving motor 4 to rotate the hollow rotating shaft 5. Simultaneously, the water pump is activated, allowing external water to enter the inlet pipe 11 and be injected onto the surface of the concrete specimen through the hollow rotating shaft 5, facilitating the water abrasion durability test of the concrete specimen. Waste liquid generated during the test is filtered through filter screen 12 and enters the collection box 13. Once the collection box 13 is full, the solenoid valve is opened to discharge the liquid through the drain pipe 14. After the hollow rotating shaft 5 rotates a specified number of times, motor 4 and the water pump are turned off, and cylinder 2 is activated, causing the lifting plate 3 to move upwards, moving the ball bearings 9 away from the concrete specimen. The lifting mechanism then pushes the concrete specimen upwards, facilitating personnel to retrieve it.

[0027] like Figure 1 , Figure 2 and Figure 4 As shown, the lifting mechanism includes a lifting frame 1601 that passes through and is slidably connected to the test bench 1. The lifting frame 1601 is fixedly connected to the bottom of the lifting plate 3. A lifting rod 1602 is provided on the top of the lifting frame 1601. A connecting frame 1603 is fixedly connected to the top of the lifting rod 1602. A lifting rod 1604 is fixedly connected to the top of the connecting frame 1603. The lifting rod 1604 passes through the filter screen 12 and is slidably connected to the filter screen 12. The lifting rod 1602 passes through the collection box 13 and is slidably connected to the collection box 13. When the durability of the concrete test block is tested by the ball bearing method, when the connecting frame 1603 slides to fit against the inner bottom of the collection box 13, the top of the lifting rod 1604 is flush with the top of the filter screen 12, and the filter screen 12 and the lifting rod 1604 support the concrete test block.

[0028] During use, when the lifting plate 3 moves downward, it will cause the lifting frame 1601 to move downward. At this time, the lifting rod 1602, connecting frame 1603, and lifting rod 1604 will slide downward under their own weight and the weight of the concrete test block until the top of the lifting rod 1604 is flush with the top of the filter screen 12. At this time, the lifting plate 3 is still in a downward state. When the measuring mechanism 7 is in the maximum compression state, the lifting plate 3 stops moving downward. After the test is completed, when the lifting plate 3 moves upward, it will cause the lifting frame 1601 to move upward. At this time, the lifting frame 1601 does not contact the lifting rod 1602. When cylinder 2 reaches half its elongation, the lifting frame 1601 will contact the lifting rod 1602. As cylinder 2 continues to elongate, the lifting plate 3 will drive the lifting frame 1601 to push the lifting rod 1602 upward, which in turn pushes the concrete block upward through the connecting frame 1603 and the lifting rod 1604 until cylinder 2 reaches its maximum elongation. Then, cylinder 2 can be closed, and the concrete block can be removed. This prevents personnel from getting their fingers pinched by the concrete block when placing it, and also prevents the need for tools to remove the concrete block after the test. This provides good protection for personnel and improves the efficiency of the test.

[0029] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A testing apparatus for concrete durability, comprising a test bench (1) and a drive mechanism, characterized in that: The bottom of the drive mechanism is connected to a grinding disc (8) via a measuring mechanism (7). The measuring mechanism (7) includes a sleeve (701) fixedly connected to the bottom of the output end of the drive mechanism. A slide rod (702) is slidably connected inside the sleeve (701). A measuring spring (703) is fixedly connected to the top of the slide rod (702). A measuring rod (704) is fixedly connected to the top of the slide rod (702). The measuring spring (703) is fixedly connected to the bottom of the output end of the drive mechanism and located inside the sleeve (701). The slide rod (702) is fixedly connected to the top of the grinding disc (8). A ball bearing (9) is installed on the grinding disc (8). A filter screen (12) is fixedly connected to the top of the test bench (1). A limiting plate (15) is fixedly connected to the filter screen (12). The position of the concrete test block is limited by the limiting plate (15). A lifting mechanism is slidably connected to the test bench (1). The concrete test block moves up and down inside the limiting plate (15) under the action of the lifting mechanism.

2. The testing apparatus for concrete durability according to claim 1, characterized in that: The driving mechanism includes a cylinder (2) installed on the top of the test bench (1), a lifting plate (3) fixedly connected to the output end of the cylinder (2), a motor (4) installed on the top of the lifting plate (3), a hollow rotating shaft (5) fixedly connected to the output end of the motor (4), a fixed plate (6) fixedly connected to the bottom of the hollow rotating shaft (5), a sleeve (701) fixedly connected to the bottom of the fixed plate (6), a measuring spring (703) fixedly connected to the bottom of the fixed plate (6), and a measuring rod (704) passing through the fixed plate (6) and slidingly connected to the fixed plate (6).

3. The testing apparatus for concrete durability according to claim 2, characterized in that: The outer surface of the hollow shaft (5) is rotatably connected to a collar (10), and a water inlet pipe (11) is fixedly connected to the collar (10). The water inlet of the hollow shaft (5) is located within the collar (10).

4. The testing apparatus for concrete durability according to claim 2, characterized in that: A collection box (13) is fixedly connected to the bottom of the test bench (1), and a drain pipe (14) is fixedly connected to the bottom of the collection box (13). The filter screen (12) is set on the top of the collection box (13).

5. The testing apparatus for concrete durability according to claim 4, characterized in that: The lifting mechanism includes a lifting frame (1601) that passes through the test bench (1) and is slidably connected to the test bench (1). The lifting frame (1601) is fixedly connected to the bottom of the lifting plate (3). A lifting rod (1602) is provided on the top of the lifting frame (1601). A connecting frame (1603) is fixedly connected to the top of the lifting rod (1602). A lifting rod (1604) is fixedly connected to the top of the connecting frame (1603). The lifting rod (1604) passes through the filter screen (12) and is slidably connected to the filter screen (12). The lifting rod (1602) passes through the collection box (13) and is slidably connected to the collection box (13).

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