A device for detecting the strength of a concrete precast

Abstract

The application provides a concrete prefabricated part strength detection device, which comprises a testing machine main body, the testing machine main body is placed on the ground, a recess is arranged on the upper part of the testing machine main body along the length direction of the testing machine main body, a moving seat is arranged at the lower end of the recess, channels are arranged at the two side ends of the moving seat, the moving seat is connected with the testing machine main body, a strength detection mechanism is arranged above the testing machine main body, the strength detection mechanism is slidably connected with the testing machine main body, two slide rails are arranged on the ground, the testing machine main body is slidably connected with the two slide rails, a plurality of jacking oil cylinders are arranged between the two slide rails, a tray is arranged at the output end of the jacking oil cylinder, a supporting wheel is rotatably connected to the top of the tray, and the supporting wheel is used for placing a concrete prefabricated part to be detected. The application can improve the detection accuracy.

Description

Technical Field

[0001] This invention relates to the field of concrete strength testing technology, specifically a device for testing the strength of precast concrete components. Background Technology

[0002] Currently, the strength testing of precast concrete components typically employs the following methods: 1. Compressive strength test: The precast component is placed on a testing machine, and gradually increasing pressure is applied. The relationship curve between pressure and deformation is recorded, and the compressive strength of the precast component is calculated according to relevant national standards. 2. Flexural strength test: The precast component is supported at both ends, and a gradually increasing bending force is applied in the middle. The relationship curve between its central deflection and load is recorded, and the flexural strength of the precast component is calculated according to relevant national standards. 3. Impact strength test: The precast component is impacted using an impact testing machine, and the relationship curve between impact force and impact energy is recorded. The impact strength of the precast component is calculated according to relevant national standards. 4. Ultrasonic testing: The precast component is ultrasonically tested using an ultrasonic testing instrument, and the test results are analyzed to estimate the strength of the precast component. These methods can effectively test the strength of precast concrete components, and the appropriate testing method can be selected according to different application scenarios and requirements. The structure of the testing machine is shown in the figure below.

[0003] However, existing concrete testing machines require cranes or lifting equipment to hoist precast hollow concrete components before testing can begin. This process is cumbersome, time-consuming, labor-intensive, and costly. The main reason for this problem is the large size of some precast concrete components, making it impossible to lift them manually onto the testing machine, let alone conduct subsequent strength tests. This is a major reason for the high cost of strength testing for precast concrete components. Furthermore, using cranes to lift precast concrete components carries safety risks. Improving the concrete testing machine itself to eliminate the need for lifting equipment during testing would not only reduce costs but also ensure safety. This is a viable research direction. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention proposes a strength testing device for precast concrete components.

[0005] The present invention provides a strength testing device for precast concrete components, comprising:

[0006] The main body of the testing machine is placed on the ground. A groove is provided on the upper part of the main body along its length. A movable seat is provided at the lower end of the groove. Channels are provided on both sides of the movable seat. The movable seat is connected to the main body of the testing machine.

[0007] A strength testing mechanism is located above the main body of the testing machine; the strength testing mechanism is slidably connected to the main body of the testing machine.

[0008] Two slide rails are located underground; the main body of the testing machine is slidably connected to the two slide rails.

[0009] Several lifting cylinders are placed between the two slide rails; the lifting cylinders are arranged in two rows, parallel to the slide rails, and respectively corresponding to the two channels, which are used for the lifting cylinders to pass through; after the output end of the lifting cylinder is fully extended, the height of the lifting cylinder is greater than the height of the channel; the output end of the lifting cylinder is provided with a tray, and the top of the tray is rotatably connected to a support roller, which is used to place the precast concrete component to be inspected.

[0010] Preferably, the upper ends of both sides of the main body of the testing machine are provided with electric slide rails, the two sides of the inverted U-shaped moving part are respectively slidably connected to the two electric slide rails, and the strength detection mechanism is provided at the lower end of the middle part of the inverted U-shaped moving part.

[0011] Preferably, the strength testing mechanism includes a hydraulic press, which is electrically connected to a pressure sensor.

[0012] Preferably, the movable seat is configured as a hollow structure, and a buffer seat is provided on the movable seat. The buffer seat extends from the top of the movable seat into the interior of the movable seat. A first sliding plate is provided at the lower end of the buffer seat. The first sliding plate divides the interior of the movable seat into a first upper cavity and a first lower cavity. The first sliding plate can move up and down inside the movable seat. The interior of the first lower cavity is filled with hydraulic oil and is provided with an oil outlet, which is connected to an external oil pump.

[0013] Preferably, the buffer seat is configured as a cavity structure, and a test platform is provided on the buffer seat. The test platform is used to place the precast concrete component to be tested. A support column is provided at the lower end of the test platform. The support column extends from the top of the buffer seat into the interior of the buffer seat. A second sliding plate is provided at the lower end of the support column. The second sliding plate divides the interior of the buffer seat into a second upper cavity and a second lower cavity. The second sliding plate can move up and down inside the buffer seat. The upper end of the second sliding plate is connected to the inner top wall of the second upper cavity through several elastic elements. The interior of the second lower cavity is filled with hydraulic oil. Under pressure, the upper end face of the test platform, the upper end face of the channel, and the lower end face of the groove are at the same horizontal plane.

[0014] Preferably, the top of the channel is provided with a retractable hollow layer, which is connected to the second lower cavity through a conveying pipe; in the fully extended state, the upper end face of the retractable hollow layer, the upper end face of the channel, and the lower end face of the groove are on the same horizontal plane.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention eliminates the need for cranes or other lifting equipment and can be integrated with precast concrete production lines. By utilizing the power equipment of the precast concrete production line to move the precast concrete components onto the support rollers, the overall inspection cost is reduced. Simultaneously, it reduces the risks to personnel associated with using lifting equipment, as lifting equipment requires hoisting the precast concrete components, and the swaying during hoisting can lead to rope breakage. This invention directly avoids this problem.

[0017] 2. This invention utilizes the gravity of the precast concrete component to move the test platform downwards, allowing hydraulic oil to enter the expandable hollow layer through a delivery pipe. This causes the expandable hollow layer to extend until it is level with the upper surface of the channel and the lower surface of the groove, thus forming a complete end face at the bottom of the precast concrete component. During actual testing, because the bottom surface of the precast concrete component is in contact with a complete end face, the actual strength data can be measured more accurately, and the actual usage environment of the precast concrete component can be better simulated, thereby improving the testing efficiency. Compared with existing technologies, such as the invention entitled "Instrument for Testing the Strength of Precast Concrete Components" (application number 2022105021263), the accuracy of this method is not accurate. In the latter, the bottom of the precast concrete component is in contact with the sliding component during testing, and there is a gap between adjacent sliding components. This makes the strength data obtained inaccurate because the gap between adjacent sliding components makes the cross-section of the precast concrete component more prone to fracture, and it is impossible to test accurate strength data. However, this method solves this problem by using the gravity of the precast concrete component itself to move the test platform downward, thereby improving the accuracy of the test.

[0018] 3. After the test is completed, the present invention can use the lifting cylinder to lift the broken precast concrete component, and then the main body of the testing machine can be reset. There is no need for manual handling of the broken precast concrete component on the main body of the testing machine, which reduces the amount of manual labor. Compared with the invention entitled "Precast Concrete Component Strength Testing Equipment" (application number 2022105021263), the present invention is more convenient in the subsequent testing and finishing work, while the above-mentioned prior art cannot achieve this technical effect. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of an embodiment of the present invention.

[0020] Figure 2 This is a top view of an embodiment of the present invention.

[0021] Figure 3 , 4 This is a front view of an embodiment of the present invention.

[0022] Figure 5 This is a cross-sectional view of the movable seat in an embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of the buffer seat in an embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the lifting cylinder in an embodiment of the present invention.

[0025] In the diagram: 1. Main body of the testing machine; 11. Slider; 2. Slide rail; 3. Electric slide rail; 31. Inverted U-shaped moving part; 32. Hydraulic press; 4. Groove; 41. Lifting cylinder; 42. Tray; 43. Support roller; 44. Channel; 5. Moving seat; 51. Buffer seat; 52. First sliding plate; 53. First lower cavity; 54. Oil outlet; 55. Second lower cavity; 56. Testing platform; 57. Spring; 6. Telescopic hollow layer; 61. Conveying pipe. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below with reference to specific illustrations.

[0027] Example: A device for testing the strength of precast concrete components, such as... Figure 1-7 As shown, the test machine includes a main body 1, which is placed on the ground. A groove 4 is provided in the upper middle part of the test machine main body 1 along its length direction. A movable seat 5 is provided at the lower end of the groove 4. Channels 44 are provided on both sides of the movable seat 5. The length of the channel 44 is less than the length of the groove 4. The movable seat 5 is connected to the end of the test machine main body 1.

[0028] Furthermore, the movable seat 5 is configured as a hollow structure, and a buffer seat 51 is provided on the movable seat 5. The buffer seat 51 extends from the top of the movable seat 5 into the interior of the movable seat 5. A first sliding plate 52 is provided at the lower end of the buffer seat 51. The first sliding plate 52 divides the interior of the movable seat 5 into a first upper cavity and a first lower cavity 53. The first sliding plate 52 can move up and down inside the movable seat 5. The interior of the first lower cavity 53 is filled with hydraulic oil. The first lower cavity 53 is provided with an oil outlet 54, which is connected to an external oil pump.

[0029] Furthermore, the buffer seat 51 is configured as a cavity structure, and a test platform 56 is provided on the buffer seat 51. The test platform 56 is used to place the precast concrete component to be tested. A support column is provided at the lower end of the test platform 56. The support column extends from the top of the buffer seat 51 into the interior of the buffer seat 51. A second sliding plate is provided at the lower end of the support column. The second sliding plate divides the interior of the buffer seat 51 into a second upper cavity and a second lower cavity 55. The second sliding plate can move up and down inside the buffer seat 51. The upper end of the second sliding plate is connected to the inner top wall of the second upper cavity by several springs 57. The interior of the second lower cavity 55 is filled with hydraulic oil. Under pressure, the upper end face of the test platform 56 is at the same level as the upper end face of the channel 44 and the lower end face of the groove 4.

[0030] Furthermore, a retractable hollow layer 6 is provided at the top of the channel 44, and the retractable hollow layer 6 is connected to the second lower cavity 55 through a conveying pipe 61; in the fully extended state, the upper end face of the retractable hollow layer 6, the upper end face of the channel 44, and the lower end face of the groove 4 are on the same horizontal plane.

[0031] Furthermore, electric slide rails 3 are provided on the upper ends of both sides of the main body 1 of the testing machine. The two sides of the inverted U-shaped moving part 31 are slidably connected to the two electric slide rails 3 respectively. A strength testing mechanism is provided at the lower middle end of the inverted U-shaped moving part 31. The strength testing mechanism includes a hydraulic press 32, which is electrically connected to a pressure sensor. When testing the strength of the precast concrete component, the thrust applied by the hydraulic press 32 at the moment the precast concrete component collapses is the maximum pressure that the precast concrete component can withstand. The pressure sensor transmits this pressure signal to the controller via an electrical signal, and the value obtained by the controller is the strength that the precast concrete component can withstand.

[0032] Furthermore, the main body 1 of the testing machine is slidably connected to two slide rails 2 via a slider 11. The bottom of the main body 1 of the testing machine is in contact with the ground, which can improve the pressure bearing capacity of the entire main body 1 of the testing machine. Therefore, the slide rails 2 are designed to be lower than the ground when actually placed, so as to ensure that the bottom of the main body 1 of the testing machine is in contact with the ground.

[0033] Furthermore, several lifting cylinders 41 are arranged between the two slide rails 2. The lifting cylinders 41 are arranged in two rows, parallel to the slide rails 2, and corresponding to the two channels 44 respectively. The channels 44 are used for the passage of the lifting cylinders 41. After the output end of the lifting cylinder 41 is fully extended, the height of the lifting cylinder 41 is greater than the height of the channel 44. The output end of the lifting cylinder 41 is provided with a tray 42. The top of the tray 42 is rotatably connected to a support roller 43, which is used to place the precast concrete component to be inspected.

[0034] The working process and principle of this embodiment are as follows:

[0035] Initial stage: The completed precast concrete components are moved onto the support roller 43 using the power of the production line. Therefore, the detection device can cooperate with the precast concrete component production line. The detection device is set at the end of the production line. When the precast concrete component is moved onto the support roller 43, the lifting cylinder 41 works, thereby driving the precast concrete component to move upward, so that the height of the precast concrete component is higher than the height of the channel 44.

[0036] Phase 1 of testing: Start the main body 1 of the testing machine, allowing it to move on the slide rail 2 and gradually approach the lifting cylinder 41. When the main body 1 of the testing machine approaches the lifting cylinder 41, because the lifting cylinder 41 corresponds to the channel 44, the lifting cylinder 41 gradually enters the channel 44. Since the height of the precast concrete component is higher than the height of the channel 44, the precast concrete component does not contact the groove 4 and gradually enters the groove 4. When the lifting cylinder 41 is completely inside the channel 44, close the slide rail 2, and the main body 1 of the testing machine stops moving.

[0037] Phase Two of the Test: The output end of the lifting cylinder 41 retracts, causing the height of the precast concrete component to decrease and gradually contact the inner bottoms of the test platform 56 and the groove 4 on both sides. When the lifting cylinder 41 is fully retracted into the channel 44 and below the height of the channel 44, the precast concrete component is in complete contact with the inner bottoms of the test platform 56 and the groove 4 on both sides. This is because the two sides below the test platform 56 are connected to the inner top wall of the second lower cavity 55 by springs 57, and hydraulic oil is filled between the bottom of the second sliding plate and the second lower cavity 55. After the precast component fully contacts the test platform 56, the second sliding plate descends, and the spring 57 stretches. At this time, hydraulic oil can buffer the precast concrete component, preventing it from making hard contact with the main body 1 of the testing machine and reducing the probability of damage. Simultaneously, hydraulic oil enters the expandable hollow layer 6 through the delivery pipe 61, causing the expandable hollow layer 6 to extend, so that the upper end face of the expandable hollow layer 6 is at the same level as the upper end face of the channel 44 and the lower end face of the groove 4, thereby forming a complete end face at the bottom of the precast concrete component. Figure 4 As shown.

[0038] The testing process consists of three stages: 1. Activating the electric slide rail 3, causing the inverted U-shaped moving part 31 to move on the electric slide rail 3. 2. Selecting a suitable testing position, activating the hydraulic press 32. The output end of the hydraulic press 32 contacts the top of the precast concrete component and applies pressure. The thrust applied by the hydraulic press 32 at the instant the precast concrete component collapses is the maximum pressure that the precast concrete component can withstand. Then, the pressure sensor transmits this pressure signal to the controller via an electrical signal. The value obtained by the controller is the strength that the precast concrete component can withstand, which is the strength data of the precast concrete component.

[0039] In the finishing stage: After the strength data of the precast concrete component is measured, the hydraulic press 32 is turned off and reset. At the same time, the hydraulic oil in the first lower cavity 53 is drawn out by the external oil pump, causing the first sliding plate 52 to move downward in the first lower cavity 53, which in turn drives the buffer seat 51 and the test platform 56 to move downward. When the test platform 56 moves downward, under the action of the reset force of the spring 57, the hydraulic oil in the expandable hollow layer 6 flows back to the second lower cavity 55, and the expandable hollow layer 6 gradually shrinks back to its original shape. At this time, the lifting cylinder 41 is restarted to support the fractured precast concrete component. Finally, the main body of the testing machine 1 is controlled to move in the opposite direction on the slide rail 2 to its original position, completing the strength test of the precast concrete component.

[0040] The above are merely embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent substitutions made using the present invention's specification and drawings, whether directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of the present invention.

Claims

1. A strength testing device for precast concrete components, characterized in that, include: The main body of the testing machine is placed on the ground. A groove is provided on the upper part of the main body along its length. A movable seat is provided at the lower end of the groove. Channels are provided on both sides of the movable seat. The movable seat is connected to the main body of the testing machine. A strength testing mechanism is located above the main body of the testing machine; the strength testing mechanism is slidably connected to the main body of the testing machine. Two slide rails are located underground; the main body of the testing machine is slidably connected to the two slide rails. Several lifting cylinders are placed between the two slide rails; the lifting cylinders are arranged in two rows, parallel to the slide rails, and respectively corresponding to the two channels, which are used for the lifting cylinders to pass through; after the output end of the lifting cylinder is fully extended, the height of the lifting cylinder is greater than the height of the channel; the output end of the lifting cylinder is provided with a tray, and the top of the tray is rotatably connected to a support roller, which is used to place the precast concrete component to be inspected; The movable seat is configured as a hollow structure, and a buffer seat is provided on the movable seat. The buffer seat extends from the top of the movable seat into the interior of the movable seat. A first sliding plate is provided at the lower end of the buffer seat. The first sliding plate divides the interior of the movable seat into a first upper cavity and a first lower cavity. The first sliding plate can move up and down inside the movable seat. The interior of the first lower cavity is filled with hydraulic oil and is provided with an oil outlet. The oil outlet is connected to an external oil pump. The buffer seat is configured as a cavity structure, and a test platform is provided on the buffer seat. The test platform is used to place the precast concrete component to be tested. A support column is provided at the lower end of the test platform, and the support column extends from the top of the buffer seat into the interior of the buffer seat. A second sliding plate is provided at the lower end of the support column, which divides the interior of the buffer seat into a second upper cavity and a second lower cavity. The second sliding plate can move up and down inside the buffer seat. The upper end of the second sliding plate is connected to the inner top wall of the second upper cavity through several elastic elements. The interior of the second lower cavity is filled with hydraulic oil. Under pressure, the upper end face of the test platform, the upper end face of the channel, and the lower end face of the groove are at the same horizontal plane.

2. The concrete precast component strength testing device as described in claim 1, characterized in that, Electric slide rails are provided on the upper ends of both sides of the main body of the testing machine. The two sides of the inverted U-shaped moving part are slidably connected to the two electric slide rails respectively. The strength detection mechanism is provided at the lower end of the middle part of the inverted U-shaped moving part.

3. The concrete precast component strength testing device as described in claim 1 or 2, characterized in that, The strength testing mechanism includes a hydraulic press, which is electrically connected to a pressure sensor.

4. The concrete precast component strength testing device as described in claim 1, characterized in that, The top of the channel is provided with a retractable hollow layer, which is connected to the second lower cavity through a conveying pipe; in the fully extended state, the upper end face of the retractable hollow layer, the upper end face of the channel, and the lower end face of the groove are on the same horizontal plane.

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