A concrete strength testing device

Abstract

The present invention relates to the technical field of concrete testing, and specifically to a concrete strength testing device, comprising a pressure-bearing unit and a pressing unit, the pressure-bearing unit comprising a base and a supporting platform arranged at the upper end of the base, the supporting platform comprising a circular frame fixed on the top of the base, the upper surface of the circular frame being provided with a center positioning mechanism, the center positioning mechanism comprising four calibration components arranged at the corners of the upper surface of the circular frame, a driving mechanism driving the primary sliding plates in the four calibration components to move along the diagonal of the supporting platform, thereby driving the four corner clamping plates to move toward a concrete test block placed on the supporting platform, and after the corner clamping plates are clamped on the concrete corners, the concrete test block is pushed to move until it is aligned with the center of the pressing plate, thereby reducing errors that cannot be observed by the naked eye due to the manual placement of the concrete test blocks, and improving the accuracy of the compressive strength test results.

Description

Technical Field

[0001] The invention relates to the technical field of concrete detection, in particular to a concrete strength detection device. Background Art

[0002] Concrete compressive strength refers to the ability of concrete to resist pressure under pressure. It is an important performance parameter to measure the concrete material's ability to resist pressure, usually expressed as pressure per unit area, in megapascals (MPa).

[0003] According to the national standard "Standard for Test Methods for Mechanical Properties of Ordinary Concrete" (GB / T50081-2002), a standard cubic specimen with a side length of 150 mm is used. Under standard conditions (temperature 20℃±3℃, relative humidity greater than 95%), the average pressure value measured after 28 days of curing is the compressive strength of concrete; the compressive strength is divided into 12 grades: C7.5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, and C60. The larger the number, the higher the compressive strength of the concrete.

[0004] The following points should be noted when testing the compressive strength of standard concrete test blocks: 1. The pressure platform should be clean, flat and free of debris to avoid errors in the bottom force-bearing area of ​​the test block; 2. The center of the test block should be aligned with the center of the pressing plate to minimize the error caused by deviation in the pressing position.

[0005] At present, when conducting compressive strength tests on standard concrete test blocks, testers usually place the test blocks based on their experience so that they are located as close to the center of the pressure platform as possible. However, this method is basically judged by the naked eye and is overly dependent on the testers' operating experience. In addition, each test is basically conducted on multiple test blocks to take an average value, that is, after each test block is crushed, the gravel and the pressure platform need to be cleaned to avoid affecting the test results of the next test block. This process also relies on testers, resulting in a long test process and efficiency that needs to be improved. Summary of the invention

[0006] The present invention provides a concrete strength testing device to solve the problems in the related art that a pressing position of a concrete test block is deviated during testing and that the concrete test block cannot be automatically cleaned after being crushed.

[0007] The present invention provides a concrete strength testing device, including a pressure unit and a pressing unit, the pressure unit including a base and a supporting platform arranged at the upper end of the base, the pressing unit including a top plate arranged above the supporting platform, a lifting mechanism vertically installed on the top plate and a pressing plate fixed at the bottom end of the lifting mechanism, the lower surface of the top plate is fixedly connected to the upper surface of the base by four matrix-distributed columns, the supporting platform includes a circular frame fixed to the top of the base, the upper surface of the circular frame is provided with a center positioning mechanism, and the center positioning mechanism includes four calibration components arranged at the corners of the upper surface of the circular frame.

[0008] The left and right side walls of the circular frame are provided with L-shaped through grooves, the vertical sections of the two L-shaped through grooves are located on the left and right inner walls of the circular frame, and the horizontal sections of the two L-shaped through grooves pass through the left and right outer walls of the circular frame. L-shaped supporting plates are horizontally slidably arranged in the two L-shaped through grooves, and the four inner walls of the circular frame are hinged with flip plates at the top position. When the top of the L-shaped supporting plate contacts the lower surface of the flip plate, the upper surfaces of the four flip plates are in a horizontal state and are flush with the upper surface of the circular frame.

[0009] The upper surface of the flip plate is also slidably provided with a cleaning component for cleaning concrete gravel on the upper surface of the flip plate. When the L-shaped support plates move away from each other, they can drive the cleaning component to move and thus clean the upper surface of the flip plate. The support of the four flip plates can also be released twice so that the crushed concrete can automatically slide off the upper surface of the flip plate.

[0010] In a possible implementation, the calibration component includes a primary sliding plate that slides along the diagonal of the circular frame, the upper surface of the circular frame is located on both sides of the primary sliding plate with limit plates vertically fixed, an inverted T-shaped slot is provided on the upper surface of the primary sliding plate, a secondary sliding plate is slidably arranged in the inverted T-shaped slot, and the sliding direction of the secondary sliding plate is consistent with the sliding direction of the primary sliding plate, an end of the secondary sliding plate close to the center of the circular frame is fixedly connected to a corner clamping plate, and the corner clamping plate and the primary sliding plate are connected by a spring connection. The spring is connected: a ball is rolledly embedded on the lower surface of the corner clamping plate, and the ball contacts the upper surface of the flip plate in a horizontal state; a rectangular receiving groove is opened in the vertical section of the first-level sliding plate, and the rectangular receiving groove is connected to the inverted T-shaped sliding groove; a wedge-shaped locking block is provided in the rectangular receiving groove for sliding up and down; the bottom of the wedge-shaped locking block is fixedly connected to the bottom of the rectangular receiving groove by a lifting spring; a step is arranged on the inclined surface of the wedge-shaped locking block, and one end of the secondary sliding plate away from the corner clamping plate abuts against the step on the inclined surface of the wedge-shaped locking block.

[0011] In one possible implementation, fan-shaped receiving grooves are provided on the four edges of the circular frame and below the calibration component, and a strip guide groove extending along the diagonal of the circular frame is provided on the upper surface of the circular frame corresponding to the position of the primary sliding plate, the strip guide groove is connected to the fan-shaped receiving groove, and a driving mechanism for driving the four calibration components to synchronously move is installed in the fan-shaped receiving groove, and the driving mechanism includes a rotating shaft rotatably installed at the bottom of the fan-shaped receiving groove, a fixed sleeve on the rotating shaft is provided with a pulley, the pulleys in the four fan-shaped receiving grooves are connected by a belt drive, and a rotating rod is provided on the top fixed sleeve of the rotating shaft, and the end of the rotating rod is rotatably connected to a push rod via a pin shaft, and the top end of the push rod is fixedly connected to a connecting rod vertically passing through the strip guide groove, and the top end of the connecting rod is fixedly connected to the bottom end of the primary sliding plate.

[0012] In one possible implementation, the detection device also includes four unlocking mechanisms distributed in a circle, the unlocking mechanism including a wedge-shaped push block fixed on the upper surface of the secondary sliding plate, the inclined surface of the wedge-shaped push block facing the center of the circular frame, a short pressure rod is fixedly connected to the position of the wedge-shaped push block on the lower surface of the pressing plate, and a long pressure rod is fixedly connected at the corner of the side wall of the pressing plate, the lower end of the long pressure rod is lower than the lower end of the short pressure rod, and the lower end of the long pressure rod corresponds to the top of the wedge-shaped locking block.

[0013] In a possible implementation, a rectangular notch is provided on the front side wall of the circular frame, a drawer is slidably arranged in the rectangular notch, and a rear end of the drawer abuts against the rear inner wall of the circular frame.

[0014] In one possible implementation, the top ends of the adjacent sides of the two L-shaped support plates are rounded or chamfered, and the lower surfaces of the front and rear flip plates are provided with tilting rods that limit the flipping angles of the flip plates. When the L-shaped support plate no longer supports the front and rear flip plates, the front and rear tilting rods respectively contact the front and rear inner walls of the circular frame.

[0015] In one possible implementation, the cleaning component includes a strip groove, a through hole, a pull rope, a semicircular upright pole and a rubber cross plate. The upper surface of the flip plate is provided with a strip groove pointing to the center of the circular frame, and the strip groove is located in the middle of the upper surface of the flip plate. The bottom of the strip groove and one end close to the center of the circular frame are provided with a through hole. A semicircular upright pole is slidably arranged in the strip groove, and the top of the semicircular upright pole is higher than the upper surface of the flip plate and is fixedly connected to the rubber cross plate. A brush is arranged on the lower surface of the rubber cross plate. The side wall of the semicircular upright pole is connected with a pull rope. After the left and right pull ropes pass through the through hole, they are respectively fixedly connected to the left and right L-shaped supporting plates. After the front and rear pull ropes pass through the corresponding through holes, they are respectively fixedly connected to the left and right L-shaped supporting plates. In the initial state, the pull rope is in a relaxed state.

[0016] In one possible implementation, the bottom and side surfaces of the semicircular pole are both set as magnetic materials, the upper surface and inner wall of the strip groove are set as magnetic materials with different magnetic properties from the semicircular pole, and the semicircular pole and the inner wall of the pull rope are fixed by magnetism.

[0017] In a possible implementation, the semicircular upright rod is connected to the inner wall of the strip groove via a spring, and the spring is not deformed in an initial state.

[0018] The above one or more technical solutions in the embodiments of the present invention have at least one of the following technical effects: 1. The driving mechanism drives the primary sliding plate in the four calibration components to move along the diagonal of the support platform, thereby driving the four corner clamping plates to move toward the concrete test block placed on the support platform. After the corner clamping plates are clamped on the concrete corners, they push the concrete test block to move until it is aligned with the center of the pressing plate, thereby reducing the errors that cannot be observed by the naked eye due to the manual placement of the concrete test blocks and improving the accuracy of the compressive strength test results.

[0019] 2. The L-shaped supporting plates that move away from each other release the support for the flip plate, allowing the concrete gravel to slide down along the upper surface of the flip plate after flipping. In addition, when the L-shaped supporting plates move away from each other, they can also drive the upper surface of the cleaning component to be cleaned, ensuring that the upper surface of the supporting platform is clean and free of debris when the next block is placed, saving manual cleaning time and improving detection efficiency.

[0020] 3. The long and short pressure rods in the unlocking mechanism are driven downward by the pressing plate, so that the unlocking mechanism releases the lock of the wedge-shaped locking block on the secondary sliding plate and the limit of the corner clamping plate on the concrete test block in turn, ensuring that the corner clamping plate is separated from the concrete test block before the pressing plate is pressed onto the concrete test block, so as to avoid inaccurate compressive strength results due to the concrete test block being clamped by external force. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the present invention.

[0022] Figure 2 It is a three-dimensional structural schematic diagram of the support platform, calibration assembly and driving mechanism of the present invention.

[0023] Figure 3 It is a three-dimensional structural schematic diagram of the lifting mechanism and the pressing plate of the present invention.

[0024] Figure 4 It is a partial cutaway view of the calibration assembly of the present invention.

[0025] Figure 5 yes Figure 2 A magnified schematic diagram of area A in the middle.

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure of the circular frame.

[0027] Figure 7 It is a three-dimensional structural schematic diagram of the circular frame and the flip plate.

[0028] Figure 8 This is a partial cutaway view of the support platform.

[0029] Fig. 9 yes Figure 8 A magnified schematic diagram of area B.

[0030] Fig.10 It is a cross-sectional schematic diagram of the flip plate and the circular frame.

[0031] In the figure: 1, base; 2, column; 3, top plate; 4, lifting mechanism; 5, pressing plate; 6, supporting platform; 60, circular frame; 61, flip plate; 62, fan-shaped receiving groove; 63, strip guide groove; 64, L-shaped through groove; 65, L-shaped supporting plate; 66, rectangular notch; 67, cleaning component; 671, strip groove; 672, through hole; 673, pull rope; 674, semicircular pole; 675, rubber horizontal plate; 68, drawer Drawer; 7. Calibration assembly; 71. Limit plate; 72. Primary sliding plate; 73. Secondary sliding plate; 74. Corner clamping plate; 75. Connecting spring; 76. Wedge-shaped locking block; 77. Lifting spring; 8. Driving mechanism; 80. Rotating shaft; 81. Pulley; 82. Rotating rod; 83. Push rod; 84. Connecting rod; 85. Belt; 9. Unlocking mechanism; 91. Long pressure rod; 92. Short pressure rod; 93. Wedge-shaped push block. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] See also Figure 1 , Figure 2 and Figure 3 A concrete strength testing device includes a pressure unit and a pressing unit. The pressure unit includes a base 1 and a supporting platform 6 arranged at the upper end of the base 1. The pressing unit includes a top plate 3 arranged above the supporting platform 6, a lifting mechanism 4 vertically installed on the top plate 3, and a pressing plate 5 fixed at the bottom end of the lifting mechanism 4. The lower surface of the top plate 3 is fixedly connected to the upper surface of the base 1 through four matrix-distributed columns 2.

[0034] See also Figure 1 , Figure 4, Figure 7 and Figure 8 The supporting platform 6 includes a circular frame 60 fixed on the top of the base 1, and a center positioning mechanism is provided on the upper surface of the circular frame 60. The center positioning mechanism includes four calibration components 7 arranged at the corners of the upper surface of the circular frame 60. The calibration component 7 includes a primary sliding plate 72 that slides along the diagonal of the circular frame 60. The primary sliding plate 72 is an inverted L-shaped structure. The upper surface of the circular frame 60 is located on both sides of the primary sliding plate 72. The limiting plates 71 limit the moving direction of the primary sliding plate 72. An inverted T-shaped slide groove is provided on the upper surface of the primary sliding plate 72. A secondary sliding plate 73 is slidably provided in the inverted T-shaped slide groove, and the sliding direction of the secondary sliding plate 73 is consistent with the sliding direction of the primary sliding plate 72. The locking plate 77 is pressed against the top of the plate 74 to lock the locking plate 71, so that the locking plate 71 is in a state of being pushed and the locking plate 72 is locked.

[0035] See also Figure 2 , Figure 5 and Figure 6The four edges of the circular frame 60 are provided with fan-shaped receiving grooves 62 below the calibration component 7. The upper surface of the circular frame 60 is provided with a strip guide groove 63 extending along the diagonal of the circular frame 60 at a position corresponding to the first-level sliding plate 72. The strip guide groove 63 is connected to the fan-shaped receiving groove 62. A driving mechanism 8 for driving the four calibration components 7 to synchronously move is installed in the fan-shaped receiving groove 62. The driving mechanism 8 includes a rotating shaft 80 rotatably installed at the bottom of the fan-shaped receiving groove 62. A pulley 81 is fixedly sleeved on the rotating shaft 80. The pulleys 81 in the four fan-shaped receiving grooves 62 are connected by a belt 85. The top of the rotating shaft 80 is fixedly mounted on the rotating shaft 80. The fixed sleeve is provided with a rotating rod 82, the end of which is rotatably connected to a pushing rod 83 via a pin shaft, the top of which is fixedly connected to a connecting rod 84 that vertically penetrates the strip guide groove 63, and the top of the connecting rod 84 is fixedly connected to the bottom end of the primary sliding plate 72; by driving any one of the rotating shafts 80 to rotate, the transmission between the pulley 81 and the belt 85 can be used to drive the remaining rotating shafts 80 to rotate synchronously, and the rotating shaft 80 synchronously drives the rotating rod 82 to rotate, and the pushing rod 83 is driven by the rotating rod 82 to push the connecting rod 84 to move along the strip guide groove 63, thereby realizing the synchronous approach or synchronous separation of the four primary sliding plates 72.

[0036] It should be noted that the rotation of the rotating shaft 80 can be driven directly by a motor, or can be rotated manually with the aid of a tool.

[0037] See also Figure 6 , Figure 7 and Figure 8 The left and right side walls of the circular frame 60 are provided with L-shaped through grooves 64, the vertical sections of the two L-shaped through grooves 64 are located on the left and right inner walls of the circular frame 60, and the horizontal sections of the two L-shaped through grooves 64 penetrate the left and right outer walls of the circular frame 60. L-shaped supporting plates 65 are horizontally slidably arranged in the two L-shaped through grooves 64. The four inner walls of the circular frame 60 are hinged with flip plates 61 at the top positions. When the top of the L-shaped supporting plate 65 contacts the lower surface of the flip plate 61, the upper surfaces of the four flip plates 61 are in a horizontal state and are flush with the upper surface of the circular frame 60. Fig. 9 As shown, a ball is rolled and embedded in the lower surface of the corner clamping plate 74, and the ball is in contact with the upper surface of the horizontal flip plate 61. When the two L-shaped supporting plates 65 gradually move away from each other, the top of the L-shaped supporting plate 65 will still contact the lower surfaces of the left and right flip plates 61, while the lower surfaces of the front and rear flip plates 61 will no longer contact the L-shaped supporting plate 65. At this time, the front and rear flip plates 61 flip downward.

[0038] See also Figure 2 , Figure 8 and Fig. 9The upper surface of the flip plate 61 is also slidably provided with a cleaning assembly 67, and the cleaning assembly 67 includes a strip groove 671, a through hole 672, a pull rope 673, a semicircular upright rod 674 and a rubber cross plate 675. The upper surface of the flip plate 61 is provided with a strip groove 671 pointing to the center of the circular frame 60, and the strip groove 671 is located in the middle of the upper surface of the flip plate 61. The bottom of the strip groove 671 and one end close to the center of the circular frame 60 are provided with a through hole 672. A semicircular upright rod 674 is slidably provided in the strip groove 671, and the top of the semicircular upright rod 674 is higher than the upper surface of the flip plate 61 and fixedly connected There is a rubber horizontal plate 675, and a brush is arranged on the lower surface of the rubber horizontal plate 675. The bottom of the brush can extend into the strip groove 671, and the brushes located on both sides of the strip groove 671 are deformed and contact with the upper surface of the flip plate 61. The side wall of the semicircular vertical rod 674 is connected with a pull rope 673. After the left and right pull ropes 673 pass through the through hole 672, they are fixedly connected to the left and right L-shaped supporting plates 65 respectively. After the front and rear pull ropes 673 pass through the corresponding through holes 672, they are fixedly connected to the left and right L-shaped supporting plates 65 respectively. It should be noted that the end of the pull rope 673 is connected to the non-top position of the L-shaped supporting plate 65.

[0039] It should be noted that the bottom and circumferential surface of the semicircular upright 674 are both set as magnetic materials, and the upper surface and inner wall of the strip groove 671 are set as magnetic materials with different magnetism from the semicircular upright 674. In the initial state, the L-shaped supporting plate 65 is in contact with the bottom of the flip plate 61, and the pull rope 673 is in a relaxed state, and the semicircular upright 674 is magnetically fixed to the inner wall of the strip groove 671. As the L-shaped supporting plate 65 gradually moves away from each other, the bottoms of the front and rear flip plates 61 will flip downward after losing support, and all the pull ropes 673 will be gradually pulled until they are taut, and then the semicircular upright 674 moves along the strip groove 671 under the pulling force of the pull rope 673 and gradually moves closer, and because the front and rear flip plates 61 are flipped downward, the crushed concrete on their upper surfaces can be moved along the front under the action of gravity. The upper surfaces of the last two flip plates 61 slide downward, and the four brushes that gradually move closer together can push the concrete that has not fallen and clean the upper surface of the flip plate 61. The concrete gravel that falls into the strip groove 671 can be discharged from the through hole 672. When the L-shaped supporting plate 65 moves into the L-shaped through groove 64, the bottoms of the left and right flip plates 61 also lose their supporting force and flip downward. The concrete on the upper surface of the flip plate 61 that has completed the strength test falls into the circular frame 60. The magnetic attraction of the semicircular upright 674 and the strip groove 671 can ensure that the semicircular upright 674 will not tilt during the process of being pulled and moved. In addition, the semicircular upright 674 and the inner wall of the strip groove 671 can also be connected by a spring, which is the same as the purpose of the magnetic attraction method, ensuring that the semicircular upright 674 will not tilt and can be reset.

[0040] See also Figure 2 and Figure 7 A rectangular notch 66 is provided on the front side wall of the circular frame 60, and a drawer 68 is slidably provided in the rectangular notch 66. The rear end of the drawer 68 abuts against the rear inner wall of the circular frame 60, and the concrete falling from the crack between the flip plates 61 eventually falls into the drawer 68 and is collected, thereby avoiding the problem of inconvenient cleaning of the crushed concrete.

[0041] It should be noted that the movement of the L-shaped supporting plate 65 can be moved by a driving member or can be pushed manually, and in order to enable the L-shaped supporting plates 65 to lift up the front and rear flip plates 61 when they are close to each other, the top ends of the two L-shaped supporting plates 65 on the adjacent sides are rounded or chamfered (not shown in the drawings), and in order to prevent the front and rear flip plates 61 that rotate first from flipping downward at too large an angle, tilting rods are provided on the lower surfaces of the front and rear flip plates 61, such as Fig.10 As shown, the tilting rods on the front and rear sides will contact the front and rear inner walls of the circular frame 60 after the corresponding flip plates 61 flip downward.

[0042] See also Figure 1 and Figure 4 The detection device also includes four unlocking mechanisms 9 distributed in a circle, and the unlocking mechanism 9 includes a wedge-shaped push block 93 fixed on the upper surface of the secondary sliding plate 73, and the inclined surface of the wedge-shaped push block 93 faces the center of the circular frame 60. A short pressure rod 92 is fixedly connected to the position of the wedge-shaped push block 93 on the lower surface of the pressing plate 5, and a long pressure rod 91 is fixedly connected to the corner of the side wall of the pressing plate 5. The lower end of the long pressure rod 91 is lower than the lower end of the short pressure rod 92, and the lower end of the long pressure rod 91 corresponds to the top of the wedge-shaped locking block 76. In the process of driving the pressing plate 5 to move downward, the long pressing rod 91 will first contact the upper end of the wedge-shaped locking block 76 and press the wedge-shaped locking block 76 downward. At this time, the step on the wedge-shaped locking block 76 no longer restricts the end of the secondary sliding plate 73. Then the short pressing rod 92 begins to contact the inclined surface of the wedge-shaped push block 93 and pushes the wedge-shaped push block 93 to move. The wedge push block 93 then drives the corner clamping plate 74 to move through the secondary sliding plate 73. At this point, the four corner clamping plates 74 gradually move away from the concrete test block to avoid affecting the subsequent compressive strength test.

[0043] Working process: First, wipe off the moisture on the surface of the concrete test block that has been cured under standard conditions for 28 days, measure the size of the concrete test block with an accuracy of 1mm, and calculate the bearing area of ​​the test block accordingly. Usually, the standard size of the cube test block is 150mm*150mm*150mm. Then, check the appearance of the concrete test block to ensure that there are no obvious defects on the surface of the test block, the unevenness of the bearing surface is required to not exceed 0.05%, and the non-vertical deviation between the bearing surface and the adjacent surface is not more than 1 degree.

[0044] The concrete test block is placed on the lower pressure plate of the pressure testing machine, that is, on the supporting platform 6 in the present invention, and then any one of the rotating shafts 80 is driven to rotate, and the transmission between the pulley 81 and the belt 85 drives the remaining rotating shafts 80 to rotate synchronously, and the rotating shaft 80 synchronously drives the rotating rod 82 to rotate, and the pushing rod 83 is driven by the rotating rod 82 to push the connecting rod 84 to move along the strip guide groove 63, and the four primary sliding plates 72 are synchronously approached to the concrete test block until the four corner clamping plates 74 collide with the four corners of the concrete test block. This process can fine-tune the position of the concrete test block so that the center of the concrete test block is completely aligned with the center of the supporting platform 6.

[0045] Then start the testing machine. When the lifting mechanism 4 drives the pressing plate 5 to move downward and gradually approach the upper surface of the concrete test block, the unlocking mechanism 9 is used to release the restriction of the corner clamping plate 74 on the corner of the concrete test block. When pressurizing, the load should be applied continuously and evenly. When the concrete strength grade is less than C30, the loading speed is 0.3-0.5MPa / s; when the concrete strength grade is equal to or greater than C30, the loading speed is 0.5-0.8MPa / s. When the concrete test block is close to failure and begins to deform rapidly, the throttle of the testing machine should be stopped (that is, the downward pressing speed of the lifting mechanism 4 should be adjusted) until the concrete test block is destroyed. The failure load is recorded, and the arithmetic mean of the measured values ​​of the three test blocks is taken as the compressive strength value of the group of test blocks.

[0046] When the lifting mechanism 4 starts to rise and reset, first the short pressure rod 92 separates from the inclined surface of the wedge-shaped push block 93, at this time the connecting spring 75 resets, the corner clamping plate 74 moves closer to the concrete test block with the secondary sliding plate 73, then the long pressure rod 91 separates from the wedge-shaped locking block 76, the jacking spring 77 drives the wedge-shaped locking block 76 to move up to limit and lock the secondary sliding plate 73 again, and then the two L-shaped supporting plates 65 gradually move away from each other, the top end of the L-shaped supporting plate 65 will still contact the lower surfaces of the left and right flip plates 61, and the lower surfaces of the front and rear flip plates 61 The surface is no longer in contact with the L-shaped supporting plate 65. At this time, the front and rear flip plates 61 flip downward, and the crushed concrete on their upper surfaces can slide down along the upper surfaces of the front and rear flip plates 61 under the action of gravity. At the same time, the brushes in the four cleaning components 67 clean the upper surfaces of the flip plates 61; when the L-shaped supporting plate 65 moves into the L-shaped through groove 64, the bottoms of the left and right flip plates 61 also lose their supporting force and flip downward, and the concrete on the upper surfaces of the flip plates 61 that has completed strength testing falls into the drawer 68 and is collected.

[0047] It should be noted that the compressive strength testing process of concrete test blocks is an existing technology.

[0048] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A concrete strength testing device, comprising a pressure unit and a pressing unit, wherein the pressure unit comprises a base and a supporting platform arranged at the upper end of the base, the pressing unit comprises a top plate arranged above the supporting platform, a lifting mechanism vertically mounted on the top plate, and a pressing plate fixed at the bottom end of the lifting mechanism, wherein the lower surface of the top plate is fixedly connected to the upper surface of the base through four columns distributed in a matrix, and characterized in that: The supporting platform includes a circular frame fixed on the top of the base, and a center positioning mechanism is arranged on the upper surface of the circular frame. The center positioning mechanism includes four calibration components arranged at the corners of the upper surface of the circular frame; The left and right side walls of the circular frame are provided with L-shaped through grooves, the vertical sections of the two L-shaped through grooves are located on the left and right inner walls of the circular frame, and the horizontal sections of the two L-shaped through grooves penetrate the left and right outer walls of the circular frame. L-shaped supporting plates are horizontally slidably arranged in the two L-shaped through grooves, and the four inner walls of the circular frame are hinged with flip plates at the top positions. When the top of the L-shaped supporting plate contacts the lower surface of the flip plate, the upper surfaces of the four flip plates are in a horizontal state and are flush with the upper surface of the circular frame. A cleaning assembly for cleaning concrete and gravel on the upper surface of the flip plate is also slidably provided on the upper surface of the flip plate. When the L-shaped supporting plates move away from each other, the cleaning assembly can be driven to move to clean the upper surface of the flip plate. The support of the four flip plates can also be released twice to allow the crushed concrete to automatically slide off the upper surface of the flip plate. The calibration component includes a primary sliding plate that slides along the diagonal of the circular frame, and the upper surface of the circular frame is located on both sides of the primary sliding plate with vertically fixed limit plates, and the upper surface of the primary sliding plate is provided with an inverted T-shaped sliding groove, and a secondary sliding plate is slidably arranged in the inverted T-shaped sliding groove, and the sliding direction of the secondary sliding plate is consistent with the sliding direction of the primary sliding plate, and the end of the secondary sliding plate close to the center of the circular frame is fixedly connected with a corner clamping plate, and the corner clamping plate is connected to the primary sliding plate through a connecting spring; A rectangular receiving groove is provided in the vertical section of the primary sliding plate, and the rectangular receiving groove is connected with the inverted T-shaped sliding groove. A wedge-shaped locking block is provided in the rectangular receiving groove to slide up and down through a lifting spring. A step-shaped shape is provided on the inclined surface of the wedge-shaped locking block. One end of the secondary sliding plate away from the corner clamping plate abuts against the step on the inclined surface of the wedge-shaped locking block. Fan-shaped receiving grooves are provided on the four edges of the circular frame and below the calibration component. A strip guide groove extending along the diagonal of the circular frame is provided on the upper surface of the circular frame corresponding to the position of the first-level sliding plate. The strip guide groove is connected to the fan-shaped receiving groove. A driving mechanism for driving the four calibration components to move synchronously is installed in the fan-shaped receiving groove.

2. A concrete strength testing device according to claim 1, characterized in that: The driving mechanism includes a rotating shaft rotatably installed at the bottom of the fan-shaped accommodating groove, a fixed sleeve on the rotating shaft is provided with a pulley, the pulleys in the four fan-shaped accommodating grooves are connected by belt transmission, and a rotating rod is provided on the top fixed sleeve of the rotating shaft. The end of the rotating rod is rotatably connected to a pushing rod through a pin shaft, and the top end of the pushing rod is fixedly connected to a connecting rod that vertically penetrates the strip guide groove, and the top end of the connecting rod is fixedly connected to the bottom end of the primary sliding plate.

3. A concrete strength testing device according to claim 1, characterized in that: The detection device also includes four unlocking mechanisms distributed in a circle, the unlocking mechanism includes a wedge-shaped push block fixed on the upper surface of the secondary sliding plate, the inclined surface of the wedge-shaped push block faces the center of the circular frame, a short pressure rod is fixedly connected to the position of the wedge-shaped push block on the lower surface of the pressing plate, and a long pressure rod is fixedly connected to the corner of the side wall of the pressing plate, the lower end of the long pressure rod is lower than the lower end of the short pressure rod, and the lower end of the long pressure rod corresponds to the top of the wedge-shaped locking block.

4. A concrete strength testing device according to claim 1, characterized in that: A rectangular notch is provided on the front side wall of the circular frame, a drawer is slidably arranged in the rectangular notch, and the rear end of the drawer abuts against the rear inner wall of the circular frame.

5. A concrete strength testing device according to claim 4, characterized in that: The top ends of the adjacent sides of the two L-shaped supporting plates are rounded or chamfered, and the lower surfaces of the front and rear flip plates are provided with tilting rods for limiting the flipping angles of the flip plates. When the L-shaped supporting plate no longer supports the front and rear flip plates, the front and rear tilting rods respectively contact the inner side walls of the circular frame.

6. A concrete strength testing device according to claim 1, characterized in that: The cleaning assembly includes a strip groove, a through hole, a pull rope, a semicircular upright pole and a rubber cross plate. The upper surface of the flip plate is provided with a strip groove pointing to the center of the circular frame, and the strip groove is located in the middle of the upper surface of the flip plate. The bottom of the strip groove and one end close to the center of the circular frame are provided with a through hole. A semicircular upright pole is slidably arranged in the strip groove, and the top of the semicircular upright pole is higher than the upper surface of the flip plate and is fixedly connected to the rubber cross plate. A brush is arranged on the lower surface of the rubber cross plate. The side wall of the semicircular upright pole is connected with a pull rope. After the left and right pull ropes pass through the through hole, they are respectively fixedly connected to the left and right L-shaped supporting plates. After the front and rear pull ropes pass through the corresponding through holes, they are respectively fixedly connected to the left and right L-shaped supporting plates. In the initial state, the pull rope is in a relaxed state.

7. A concrete strength testing device according to claim 6, characterized in that: The bottom and side surfaces of the semicircular pole are both provided with magnetic materials, the upper surface and inner side wall of the strip groove are provided with magnetic materials having different magnetic properties from the semicircular pole, and the semicircular pole and the inner wall of the pull rope are fixed by magnetic attraction.

8. A concrete strength testing device according to claim 6, characterized in that: The semicircular upright rod is connected to the inner wall of the strip groove via a spring, and the spring is not deformed in an initial state.

9. A concrete strength testing device according to claim 1, characterized in that: A ball is rotatably embedded on the lower surface of the corner clamping plate, and the ball contacts the upper surface of the flip plate in a horizontal state.

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