A kind of auxiliary positioning device for concrete test block compression detection

Abstract

The application relates to the technical field of auxiliary positioning devices, and discloses a concrete test block compression resistance detection auxiliary positioning device, which comprises a fixed base, a magnetic adsorption platform is arranged above the fixed base, a V-shaped groove is arranged in the upper surface of the magnetic adsorption platform, a pressure sensor is arranged below the V-shaped groove, and the outer surface of the pressure sensor is connected with the magnetic adsorption platform in a plug-in mode. The concrete test block compression resistance detection auxiliary positioning device can provide bidirectional constraint for cylindrical and prismatic workpieces through the symmetrical inclined surface design of the V-shaped groove of the magnetic adsorption platform, can automatically align the workpiece axis, can control the positioning error within 0.5 mm, can improve the detection efficiency, and can form an equilateral triangle resultant force in a horizontal plane through the thrust vectors of the three servo electric cylinders which are uniformly distributed at an angle of 120 DEG, so that an arbitrary direction load can be decomposed into uniform stress of the three cylinders, and the detection error is reduced.

Description

Technical Field

[0001] This application relates to the field of auxiliary positioning device technology, specifically an auxiliary positioning device for testing the compressive strength of concrete test blocks. Background Technology

[0002] Concrete compressive strength testing is a core indicator for evaluating building quality, and hydraulic pressure testing machines are currently widely used both domestically and internationally. With increasing demands for building engineering quality, the required testing accuracy has risen from ±5% to ±2%, but misalignment issues caused by manual specimen placement have long constrained accuracy improvements. In recent years, the ASTM C39 standard has added mandatory requirements for specimen alignment, prompting the industry to seek more reliable positioning technologies.

[0003] An existing patent (publication number: CN219608602U) discloses a concrete strength testing device, including a support frame. A hydraulic cylinder is fixedly mounted on the top of the support frame, and a fixing plate is fixedly mounted on the bottom of the support frame. A pressure sensor is fixedly mounted on the top of the fixing plate. A support positioning rod is hinged to the main positioning rod, and an arc-shaped telescopic component is provided between the main positioning rod and the support positioning rod. In the initial state, the support positioning rod and the main positioning rod are perpendicular to each other. The concrete test block can be limited by multiple main positioning rods. When the height of the concrete test block is higher than the main positioning rod, the operator only needs to rotate the support positioning rod upward by 90°. The multiple support positioning rods can assist in positioning the side wall of the concrete test block, thereby ensuring the stability of the strength test. The pressure sensor can input the pressure signal to the PLC device in real time, so that the operator can observe and analyze the pressure value of the concrete test block.

[0004] However, this device requires manual rotation of the positioning rod to assist in positioning the test block. During repetitive operations, fatigue effects will cause errors to accumulate gradually, increasing the probability of positioning errors. Furthermore, improper operation during manual operation can easily lead to danger. Utility Model Content

[0005] To address the shortcomings of existing technologies, this application provides an auxiliary positioning device for concrete test block compressive strength testing, which has advantages such as reducing positioning errors, improving work efficiency, and reducing operational difficulty, thus solving the problem of testing errors caused by manual placement of test blocks being easily misaligned.

[0006] To achieve the above objectives, this application provides the following technical solution: an auxiliary positioning device for testing the compressive strength of concrete test blocks, comprising a fixed base, a magnetic adsorption platform above the fixed base, a V-shaped groove on the upper surface of the magnetic adsorption platform, a pressure sensor below the V-shaped groove, the outer surface of the pressure sensor being inserted into the magnetic adsorption platform, three mounting slots on the bottom surface of the magnetic adsorption platform, a connecting block rotatably connected to the inner wall of each mounting slot, and three servo electric cylinders fixedly mounted on the upper surface of the fixed base, the output end of each servo electric cylinder being rotatably connected to the corresponding connecting block.

[0007] The magnetic adsorption platform, constructed from a low-carbon steel substrate and a neodymium iron boron permanent magnet array, eliminates the need for bolts, pressure plates, or other auxiliary tools. Workpieces are simply placed on the platform and secured by power or direct adsorption. A 120° V-groove, 15mm deep, is created on the surface. This V-groove automatically centers cylindrical or circular workpieces. The large contact area between the V-groove and the workpiece reduces tilting caused by uneven workpiece surfaces. Furthermore, the pressure sensor utilizes a thin-film strain gauge, embedded on both sides of the groove bottom at a spacing of [missing information - likely a percentage of the groove width]. Connecting blocks are installed in the corresponding mounting grooves. During the process, the servo electric cylinder will push the corresponding connecting block and adjust the angle of the magnetic adsorption platform. At this time, the connecting block will rotate relative to the output end of the corresponding servo electric cylinder. The three servo electric cylinders are installed at 120° on the lower part of the platform to form an automatic leveling mechanism. The three-point support at 120° forms an equilateral triangle, which is the most stable planar support structure in geometry. It can effectively resist external disturbances and prevent the platform from shaking. After the test block is placed in the V-groove, the pressure sensor detects the contact pressure distribution, and then the control system will drive the servo electric cylinder to adjust the tilt angle of the platform.

[0008] Furthermore, a limiting baffle is provided on the side of the magnetic adsorption platform away from the pressure sensor, and the bottom surface of the limiting baffle is fixedly connected to the magnetic adsorption platform.

[0009] The above method allows for precise positioning of the test block by pushing it axially along the V-groove until it contacts the limiting baffle.

[0010] Furthermore, a fixing frame is fixedly connected to the upper surface of the fixing base, and a motor is fixedly installed on the outer surface of the fixing frame.

[0011] With the above scheme, the fixed frame and motor serve as the power source and support structure of the entire automatic leveling mechanism, and their design directly affects the stability, accuracy and reliability of the system.

[0012] Furthermore, a bidirectional screw is fixedly connected to the output end of the motor, and the outer surface of the bidirectional screw is rotatably connected to the fixing frame.

[0013] With the above scheme, starting the motor will drive the bidirectional screw to rotate. During this process, the bidirectional screw will rotate around the central axis at its connection with the fixed frame.

[0014] Furthermore, the inner wall of the fixing frame is slidably connected to two connecting members, and the inner wall of each connecting member is threadedly connected to a bidirectional screw.

[0015] The above scheme combines the bidirectional screw and the connector to form a common opposing synchronous drive system in precision machinery. When the bidirectional screw rotates, the threads at both ends drive the connector to move synchronously in opposite directions, achieving opposing clamping or expansion.

[0016] Furthermore, each of the connectors has a fixing groove on its outer surface, and a connecting plate is inserted into the inner wall of each fixing groove.

[0017] The above solution allows for quick installation of the connecting plate by inserting it into the corresponding fixing slot. By rationally designing the parameters and structure of the fixing slot and the connecting plate, high-precision positioning, high-rigidity connection, and rapid assembly and disassembly can be achieved.

[0018] Furthermore, clamping plates are fixedly connected to the sides of the two connecting plates that are close to each other, and each clamping plate has a polyurethane anti-slip layer on its inner side lining.

[0019] The above scheme allows the moving of the connecting plate to drive the corresponding clamping plate to move, and the clamping plate can quickly clamp the test block. The surface of the polyurethane anti-slip layer is usually designed with micro-nano structures, which increase the friction coefficient by increasing the contact area and disrupting the water film.

[0020] Furthermore, a pressure detector is fixedly installed on the upper surface of the fixing frame, and a compression plate is fixedly connected to the output end of the pressure detector.

[0021] Through the above scheme, the pressure detector acts as the "tactile nerve" of the precision positioning system. By sensing changes in contact force in real time, it provides closed-loop feedback control for the equipment. By activating the pressure detector, the extrusion plate can be pushed to apply pressure to the test block, thereby enabling the test block to be tested for compressive strength.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects: This auxiliary positioning device for testing the compressive strength of concrete test blocks uses a magnetic adsorption platform with V-grooves. The symmetrical inclined surface design of the V-grooves provides bidirectional constraint on cylindrical, prismatic, and other workpieces, automatically aligning the workpiece axis. This allows the positioning error to be controlled within ±0.5mm while improving testing efficiency. Furthermore, the servo electric cylinders, evenly distributed at 120°, form an equilateral triangle resultant force in the horizontal plane, decomposing any load into a uniform force across the three cylinders, thus reducing testing errors. Attached Figure Description

[0023] Figure 1 This is a diagram illustrating the overall structure of this application; Figure 2 This is a structural diagram of the magnetic adsorption platform of this application; Figure 3 This is a structural diagram of the fixing frame in this application; Figure 4 This is a diagram of the bidirectional screw structure of this application; Figure 5 This is a structural diagram of the connector in this application.

[0024] In the picture: 1. Fixed base; 2. Fixed frame; 3. Servo electric cylinder; 4. Connecting block; 5. Magnetic adsorption platform; 6. Mounting slot; 7. Pressure sensor; 8. V-groove; 9. Limiting baffle; 10. Pressure detector; 11. Extrusion plate; 12. Motor; 13. Bidirectional screw; 14. Connector; 15. Connecting plate; 16. Clamping plate; 17. Fixed slot. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0026] Please see Figure 1 , Figure 2 This embodiment of a concrete test block compressive strength testing auxiliary positioning device includes a fixed base 1, a magnetic adsorption platform 5 above the fixed base 1, a V-shaped groove 8 on the upper surface of the magnetic adsorption platform 5, a pressure sensor 7 below the V-shaped groove 8, the outer surface of the pressure sensor 7 being inserted into the magnetic adsorption platform 5, three mounting grooves 6 on the bottom surface of the magnetic adsorption platform 5, a connecting block 4 rotatably connected to the inner wall of each mounting groove 6, and three servo electric cylinders 3 fixedly mounted on the upper surface of the fixed base 1, the output end of each servo electric cylinder 3 being rotatably connected to the corresponding connecting block 4.

[0027] Please see Figure 1 A limiting baffle 9 is provided on the side of the magnetic adsorption platform 5 away from the pressure sensor 7. The bottom surface of the limiting baffle 9 is fixedly connected to the magnetic adsorption platform 5. By pushing the test block axially along the V-groove 8 until it contacts the limiting baffle 9, the test block can be precisely positioned.

[0028] Please see Figure 1 , Figure 3 and Figure 4 A fixed frame 2 is fixedly connected to the upper surface of the fixed base 1, and a motor 12 is fixedly installed on the outer surface of the fixed frame 2. The fixed frame 2 and the motor 12 serve as the power source and support structure of the entire automatic leveling mechanism, and their design directly affects the stability, accuracy and reliability of the system.

[0029] Please see Figure 3 and Figure 4 The output end of the motor 12 is fixedly connected to a bidirectional screw 13. The outer surface of the bidirectional screw 13 is rotatably connected to the fixed frame 2. When the motor 12 is started, it will drive the bidirectional screw 13 to rotate. During this process, the bidirectional screw 13 will rotate around the central axis at the connection between it and the fixed frame 2.

[0030] Please see Figure 4 The inner wall of the fixed frame 2 is slidably connected to two connectors 14. The inner wall of each connector 14 is threadedly connected to the bidirectional screw 13. The combination of the bidirectional screw 13 and the connectors 14 constitutes a bidirectional synchronous drive system commonly used in precision machinery. When the bidirectional screw 13 rotates, the threads at both ends drive the connectors 14 to move synchronously in opposite directions, thereby achieving opposite clamping or expansion.

[0031] Please see Figure 4 and Figure 5 Each connector 14 has a fixing groove 17 on its outer surface, and a connecting plate 15 is inserted into the inner wall of each fixing groove 17. By inserting the connecting plate 15 along the corresponding fixing groove 17, the connecting plate 15 can be quickly installed. By reasonably designing the parameters and structure of the fixing groove 17 and the connecting plate 15, high-precision positioning, high-rigidity connection, and quick assembly and disassembly can be achieved.

[0032] Please see Figure 5 Two connecting plates 15 are fixedly connected to clamping plates 16 on their adjacent sides. Each clamping plate 16 has a polyurethane anti-slip layer on its inner side. The movement of the connecting plates 15 can drive the corresponding clamping plates 16 to move. The clamping plates 16 can be used to quickly clamp the test block. The surface of the polyurethane anti-slip layer is usually designed with micro-nano structures. These structures increase the friction coefficient by increasing the contact area and breaking the water film.

[0033] Please see Figure 1 , Figure 3 A pressure detector 10 is fixedly installed on the upper surface of the fixed frame 2. The output end of the pressure detector 10 is fixedly connected to the extrusion plate 11. As the "tactile nerve" of the precision positioning system, the pressure detector 10 provides closed-loop feedback control for the equipment by sensing the changes in contact force in real time. By activating the pressure detector 10, the extrusion plate 11 can be pushed to apply pressure to the test block, thereby enabling the test block to be tested for compressive strength.

[0034] This embodiment of a concrete test block compressive strength testing auxiliary positioning device, by setting up a magnetic adsorption platform 5 with a V-groove 8, can provide bidirectional constraints on cylindrical, prismatic and other workpieces through the symmetrical inclined surface design of the V-groove 8, automatically aligning the workpiece axis, so that the positioning error can be controlled within ±0.5mm while improving the testing efficiency. Furthermore, by using servo electric cylinders 3 evenly distributed at 120°, the thrust vectors of the three servo electric cylinders 3 can form an equilateral triangle resultant force in the horizontal plane, and the load in any direction can be decomposed into a uniform force on the three cylinders, thereby reducing the testing error.

[0035] It should be noted that the magnetic platform generates an adsorption force of ≥800N to prevent displacement during testing. By observing the LED indicator, the press is started after the green signal lights up to prevent danger. After the test is completed, press the pneumatic release button to release the magnetic attraction. This device is compatible with any standard test block size within the range of 100-300mm.

[0036] The working principle of the above embodiment is as follows: First, clean the platform surface to ensure there are no debris. Then, place the concrete test block in the V-groove 8 and push it axially along the V-groove 8 until it contacts the limiting baffle 9. At this time, the symmetrical inclined surface design of the V-groove 8 can provide bidirectional constraint for cylindrical, prismatic and other workpieces, automatically align the workpiece axis, and control the positioning error within ±0.5mm. At this time, the servo electric cylinder 3 is activated according to the actual situation, and the magnetic adsorption platform 5 is quickly leveled by the mutual cooperation between the servo electric cylinder 3 and the corresponding connecting block 4. Then, the motor 12 is activated, and the motor 12 will drive the bidirectional screw 13 to rotate. At this time, the rotation of the bidirectional screw 13 will drive the two corresponding connecting parts 14 to move in opposite directions or in reverse. In this way, the test blocks of different sizes can be quickly and stably clamped by the movement of the connecting parts 14. Then, the pressure detector 10 is activated, and the pressure detector 10 pushes the extrusion plate 11 to apply pressure to the test block, so as to perform pressure detection on the test block.

[0037] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0038] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An auxiliary positioning device for testing the compressive strength of concrete test blocks, comprising a fixed base (1), characterized in that: A magnetic adsorption platform (5) is provided above the fixed base (1). A V-shaped groove (8) is provided on the upper surface of the magnetic adsorption platform (5). A pressure sensor (7) is provided below the V-shaped groove (8). The outer surface of the pressure sensor (7) is inserted into the magnetic adsorption platform (5). Three mounting grooves (6) are provided on the bottom surface of the magnetic adsorption platform (5). A connecting block (4) is rotatably connected to the inner wall of each mounting groove (6). Three servo electric cylinders (3) are fixedly installed on the upper surface of the fixed base (1). The output end of each servo electric cylinder (3) is rotatably connected to the corresponding connecting block (4).

2. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 1, characterized in that: The magnetic adsorption platform (5) is provided with a limiting baffle (9) on the side away from the pressure sensor (7), and the bottom surface of the limiting baffle (9) is fixedly connected to the magnetic adsorption platform (5).

3. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 1, characterized in that: A fixing frame (2) is fixedly connected to the upper surface of the fixing base (1), and a motor (12) is fixedly installed on the outer surface of the fixing frame (2).

4. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 3, characterized in that: The output end of the motor (12) is fixedly connected to a bidirectional screw (13), and the outer surface of the bidirectional screw (13) is rotatably connected to the fixing frame (2).

5. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 4, characterized in that: The inner wall of the fixing frame (2) is slidably connected to two connectors (14), and the inner wall of each connector (14) is threadedly connected to a bidirectional screw (13).

6. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 5, characterized in that: Each of the connectors (14) has a fixing groove (17) on its outer surface, and a connecting plate (15) is inserted into the inner wall of each fixing groove (17).

7. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 6, characterized in that: Each of the two connecting plates (15) is fixedly connected to a clamping plate (16) on one side that is close to each other, and the inner side lining of each clamping plate (16) is provided with a polyurethane anti-slip layer.

8. The auxiliary positioning device for testing the compressive strength of concrete test blocks according to claim 5, characterized in that: A pressure detector (10) is fixedly installed on the upper surface of the fixed frame (2), and a pressure plate (11) is fixedly connected to the output end of the pressure detector (10).

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