A wide-width series connection type concrete compressive strength testing device

Abstract

The utility model belongs to the field of material mechanics performance test, concretely relates to a wide tandem formula concrete compressive strength testing device, it includes loading platform, 3 wide pressure testing machine, discharge platform, the mechanical conveying device for conveying the concrete test block on loading platform to the pressing plate directly below in proper order, mechanical conveying device includes two guide rails, three open -and -shut type push plate, a closed push plate, limiting mechanism, drive mechanism. The utility model patent is concentrated on the compressive strength test of concrete test block in civil engineering raw material test, according to the setting of the utility model, can conveniently realize concrete test block according to test group and test, compared with prior art, test efficiency is improved by 3 times or more, especially suitable for large quantities of concrete compressive strength test requirement. Through the device, semi-automatic and full-automatic test can be conveniently realized in the whole test process.

Description

Technical Field

[0001] This utility model relates to the field of material mechanical property testing technology, specifically to a wide-range series concrete compressive strength testing device. Background Technology

[0002] Concrete compressive strength testing machines are widely used in various testing units and scientific research and production units. The pressure testing machine that provides pressure through oil pumps and cylinders is also known as a hydraulic pressure testing machine. It mainly relies on the reaction frame system and hydraulic pressure to conduct pressure tests according to the test requirements.

[0003] Traditional pressure testing machines consist of a main unit, a hydraulic system, a force measuring unit, and a control system. The reaction system is available in two types: gantry type or 4-column type.

[0004] The main unit consists of an upper beam, columns, pressure plates, hydraulic cylinders, and pistons. The upper pressure plate is equipped with a spherical leveling device. During operation, when the bottom surface of the upper pressure plate contacts the top surface of the specimen, it can automatically adapt to the slight tilt in the height direction of the specimen, ensuring full contact between the two surfaces and thus uniform stress on the specimen.

[0005] The hydraulic system consists of a hydraulic pump, delivery valve, return valve, oil tank, oil filter, and oil pipes. The hydraulic pump is an axial five-plunger ultra-high pressure pump, directly driven by an electric motor. The delivery valve is equipped with a safety valve that overflows in case of overload, providing safety. Operating the delivery valve handwheel adjusts the oil supply to the cylinder to achieve the desired loading rate. Opening the return valve allows all oil in the cylinder and from the pump to flow back to the oil tank.

[0006] The force measurement unit mainly includes the measurement and control system, pressure sensor, etc.

[0007] The electrical system consists of a motor, start button, stop button, AC contactor, fuse, etc.

[0008] Currently, most concrete strength testing in civil engineering still uses traditional pressure testing machines for concrete compressive strength testing. Many testing institutions have to work overtime to complete the testing tasks due to the large number of test blocks required each day. This indicates that traditional pressure testing machines have drawbacks such as low testing efficiency, time-consuming, and labor-intensive operation. This is because traditional pressure testing machines can only perform one test on a single block at a time, requiring three repeated tests for a set of blocks. Since concrete compressive strength testing requires strict control over the loading rate according to testing specifications, completing a set of concrete compressive strength tests takes a long time, resulting in low work efficiency.

[0009] Currently, most mechanical testing laboratories in various testing institutions find it difficult to use traditional pressure testing machines to complete the compressive strength tests of concrete specimens that need to be cured within the same day. Some large testing institutions try to solve this problem by adding more testing machines and increasing the area of ​​the mechanical testing laboratory. However, this requires more testing personnel and a larger mechanical laboratory to complete the workload of the day. To address this issue, some equipment manufacturers are now using six-degree-of-freedom robots to assist traditional pressure testing machines in conducting tests. The testing machine still tests one specimen at a time, which only reduces the labor intensity of the staff. However, the testing efficiency has not been improved. The robot installed in front of the testing machine occupies a large amount of laboratory space, and the system is expensive to purchase.

[0010] Based on this, the present utility model is proposed. Utility Model Content

[0011] The purpose of this invention is to provide a wide-range series concrete compressive strength testing device, which can be achieved through the following technical solution: A wide-span series concrete compressive strength testing device includes a feeding platform, three wide-span pressure testing machines for simultaneously testing the compressive strength of concrete specimens, and a discharging platform. The wide-span pressure testing machine includes a column-type support frame, a hydraulic cylinder, an upper pressure plate installed at the end of the piston rod of the hydraulic cylinder, and a pressure plate on the lower crossbeam. The wide-width series concrete compressive strength testing device also includes a mechanical conveying device for sequentially conveying a group (3 pieces) of concrete test blocks on the loading platform to the area directly below the upper pressure plate of the corresponding wide-width testing machine. The mechanical conveying device includes a guide rail, 3 openable push plates, and 1 closed push plate. The openable push plate and the closed push plate are slidably connected to the guide rail. Limiting mechanisms are provided between the openable push plate closest to the closed push plate and the closed push plate, as well as between two adjacent openable push plates. A driving mechanism is also provided to drive the openable push plate and the closed push plate to move back and forth along the axis of the guide rail.

[0012] Furthermore, the enclosed push plate is slidably connected to the guide rail via a first slider, and the openable push plate is slidably connected to the guide rail via a second slider.

[0013] Furthermore, there are two second sliders. The opening and closing push plate includes a stop plate fixedly connected to the two second sliders respectively, and a movable baffle hinged to the second slider. A gap is provided between the two movable baffles.

[0014] Furthermore, the length direction of the anti-reverse plate is perpendicular to the length direction of the guide rail.

[0015] Furthermore, the wide-width pressure testing machine is provided in three parts, and the opening and closing push plate is provided in three parts.

[0016] Furthermore, the limiting mechanism includes a limiting strip, on which an elongated limiting hole is provided.

[0017] Furthermore, the drive mechanism includes a drive shaft, a main and driven transmission gear, a first transmission chain, an L-shaped connector fixedly connected to one link of the first transmission chain, a servo motor for driving the first transmission chain, and a second slider of the openable push plate adjacent to the wide-width pressure testing machine is fixedly connected to the L-shaped connector.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model patent focuses on the compressive strength testing of concrete test blocks in civil engineering concrete raw material testing. According to the design of this utility model, concrete test blocks can be conveniently fed and tested in test groups, increasing testing efficiency by 3 times, while also being energy-saving and environmentally friendly. It is particularly suitable for large-scale concrete compressive strength testing requirements. This device can easily achieve semi-automatic and fully automatic testing throughout the entire testing process. Attached Figure Description

[0019] Figure 1 This is a top view of the wide-span series concrete compressive strength testing device described in this utility model; Figure 2 This is a schematic diagram showing the distribution of the chain conveyor, wide-width pressure testing machine, and discharge platform described in this utility model. Figure 3 This is a schematic diagram of the chain conveyor device described in this utility model. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0021] The following detailed description of embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Example

[0022] like Figures 1-3As shown, a wide-span tandem concrete compressive strength testing device includes a feeding platform 10, three wide-span pressure testing machines 20 for simultaneously testing the compressive strength of concrete specimens 40, and a discharging platform 30. Each wide-span pressure testing machine 20 includes a column-type support frame 21, a hydraulic cylinder, an upper pressure plate 22 installed at the piston rod end of the hydraulic cylinder, and a bearing plate. These are all conventional structures of existing concrete compressive strength testing devices, and their structures and principles will not be described in detail. The key improvement of this invention is the ability to complete the feeding (discharging) and testing of three concrete specimens 40 in one operation. The specific implementation process is as follows: The wide-span series concrete compressive strength testing device also includes a chain conveyor 50 for sequentially conveying a group (3 pieces) of concrete test blocks 40 on the loading platform 10 to the area directly below the pressure plate 22. The chain conveyor 50 includes two guide rails 51, three openable push plates, and one closed push plate 52. The openable push plates and the closed push plate 52 are slidably connected to the guide rails 51. Limiting mechanisms are provided between the openable push plate closest to the closed push plate 52 and the closed push plate 52, as well as between two adjacent openable push plates. A driving mechanism is also provided to drive the openable push plates and the closed push plates 52 to move back and forth along the direction defined by the guide rails 51.

[0023] The two adjacent opening and closing push plates and the last opening and closing push plate and the closed push plate 52 form a receiving area for placing the concrete test block 40. The closed push plate 52 is slidably connected to the guide rail 51 by a first slider 541, and the openable push plate is slidably connected to the guide rail 51 by a second slider 542.

[0024] There are two second sliders 542. The opening and closing push plate includes a stop plate 531 fixedly connected to the two second sliders 542 respectively, and a movable baffle 53 hinged to the second sliders 542. A gap is provided between the two movable baffles 53.

[0025] The wide-width pressure testing machine 20 is provided in three units, which are disconnected from each other and connected in series on a rigid base.

[0026] The limiting mechanism includes a limiting strip 55, on which an elongated limiting hole 551 is provided.

[0027] The drive mechanism includes a transmission chain 56, an L-shaped connector 57 fixedly connected to one link of the transmission chain 56, a servo motor 58 for driving the transmission chain 56, and a second slider 542 of the openable push plate adjacent to the wide-width pressure testing machine 20, which is fixedly connected to the L-shaped connector 57.

[0028] Based on the principle of traditional pressure testing machines, this utility model has the same structure for a single pressure testing machine as a traditional pressure testing machine, and is named a wide-range pressure testing machine. Three pressure testing machines are connected in series through a rigid base to form this device.

[0029] Unlike existing one-to-three concrete pressure testing machines, this device adopts side-mounted feeding and discharging, and the feeding method uses mechanical transmission.

[0030] Among them, the opening and closing push plate adjacent to the wide-width pressure testing machine 20 is referred to as the first opening and closing push plate. In the direction closer to the closed push plate 52, the other two opening and closing push plates are referred to as the second opening and closing push plate and the third opening and closing push plate, respectively. The third opening and closing push plate is adjacent to the closed push plate 52. For the limiting strips 55, there are three groups in total, with two in each group. The first group of limiting strips 55 is close to the wide-width pressure testing machine 20, and the third group of limiting strips 55 is close to the closed push plate 52. The tail end of the first group of limiting strips 55 is fixedly connected to the second slider 542 of the second openable push plate. A top post 552 is installed on the second slider 542 of the first openable push plate, and the top post 552 can match the limiting hole 551. The tail end of the second group of limiting strips 55 is fixedly connected to the second slider 542 of the third openable push plate. A top post 552 is installed on the second slider 542 of the second openable push plate. The tail end of the third group of limiting strips 55 is fixedly connected to the first slider 541, and a top post 552 is installed on the second slider 542 of the third openable push plate.

[0031] In addition, the two ends of the first transmission chain 56 are driven by sprockets, and then the servo motor 58 drives the sprockets of the first transmission chain 56 through another second transmission chain, thus completing the chain drive.

[0032] The servo motor 58 can rotate in both directions. When the transmission chain 56 moves forward, it first drives the first opening and closing push plate forward through the L-shaped connector 57. Due to the buffering effect of the limiting hole 551 on the first set of limiting strips 55, only the first opening and closing push plate moves forward until it reaches the bottom of the third wide-width pressure testing machine 20. If there is a completed concrete test block 40 under the third machine, it will be pushed forward by the opening and closing push plate. When the top column 552 of the first opening and closing push plate moves to the end of the limiting hole 551, it will drive the second opening and closing push plate to start moving forward under the drive of the first set of limiting strips 55. This continues until the third opening and closing push plate starts moving forward and the closed push plate 52 starts moving forward, thereby driving the three concrete test blocks 40 to move forward sequentially and gradually. If there is a concrete test block 40 under the original wide-width pressure testing machine 20, it will also be pushed to the discharge platform 30 by the three opening and closing push plates in sequence. When the three new concrete test blocks 40 are positioned below the three wide-width pressure testing machines 20, the drive chain 56 reverses, causing the three opening and closing push plates to return sequentially. During the return process, when the movable baffle 53 encounters the concrete test block 40, because it is hinged and there is no stop plate 531 to block it, the movable baffle 53 will pass through both sides of the concrete test block 40. Finally, all three opening and closing push plates return to their initial positions. The wide-width pressure testing machine 20 can then be started for testing until the test is completed.

[0033] When the device is running, a set of three concrete test blocks 40 are pushed into their respective workstations at the same time through the chain conveyor device 50. The compressive strength test of the concrete test blocks at the three workstations can be carried out at the same time. In this way, the compressive strength test of a set of three concrete blocks is completed at one time, reducing the test time by 2 / 3, increasing the work efficiency by 3 times, and also greatly reducing the labor intensity of the test personnel.

[0034] The working efficiency of this utility model is three times that of traditional testing machines, and the equipment procurement cost is reduced by 50% compared with the existing one-to-three robot feeding solution. Example

[0035] The length direction of the anti-reverse plate 531 is perpendicular to the length direction of the guide rail 51.

[0036] Because the concrete test block 40 is a cube with a side length of 150cm (or 70cm), the movable baffle 53 is designed to fit better when it moves. Example

[0037] For better use and easier reset, an automatic reset device is connected between the movable baffle 53 of the openable push plate adjacent to the wide-width pressure testing machine 20 and the anti-reverse plate 531.

[0038] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0039] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, then this utility model also includes these modifications and variations.

Claims

1. A wide-span series concrete compressive strength testing device, comprising a loading platform (10), three wide-span pressure testing machines (20) for simultaneously conducting concrete compressive strength tests on concrete specimens (40), and a discharge platform (30), wherein the wide-span pressure testing machine (20) comprises a column-type support frame (21), a hydraulic cylinder, an upper pressure plate (22) installed at the end of the piston rod of the hydraulic cylinder, and a bearing plate; characterized in that: It also includes a mechanical conveying device (50) for sequentially conveying concrete test blocks (40) on the loading platform (10) to the area directly below the upper pressure plate (22). The mechanical conveying device (50) includes two guide rails (51), three openable push plates, and one closed push plate (52). The openable push plates and the closed push plates (52) are slidably connected to the guide rails (51). A limit mechanism is provided between the openable push plate (52) and the closed push plate (52) and between two adjacent openable push plates. A drive mechanism is also provided to drive the openable push plates and the closed push plates (52) to move back and forth along the direction defined by the guide rails (51).

2. The wide-width series concrete compressive strength testing device according to claim 1, characterized in that: The closed push plate (52) and the guide rail (51) are slidably connected by a first slider (541), and the openable push plate and the guide rail (51) are slidably connected by a second slider (542).

3. The wide-span series concrete compressive strength testing device according to claim 2, characterized in that: There are two second sliders (542). The opening and closing push plate includes a stop plate (531) fixedly connected to the two second sliders (542) respectively, and a movable baffle (53) hinged to the second sliders (542). There is a gap between the two movable baffles (53).

4. The wide-span series concrete compressive strength testing device according to claim 3, characterized in that: The length direction of the anti-reverse plate (531) is perpendicular to the length direction of the guide rail (51).

5. The wide-span series concrete compressive strength testing device according to claim 3, characterized in that: The limiting mechanism includes a limiting strip (55), on which a long strip-shaped limiting hole (551) is provided.

6. The wide-width series concrete compressive strength testing device according to claim 5, characterized in that: The drive mechanism includes a transmission chain (56), an L-shaped connector (57) fixedly connected to one link of the transmission chain (56), and a servo motor (58) for driving the transmission chain (56); the second slider (542) of the openable push plate adjacent to the wide-width pressure testing machine (20) is fixedly connected to the L-shaped connector (57).

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