A strength testing device for durable concrete

Abstract

The present invention discloses a strength testing device for durable concrete, comprising a base, a pendulum and a measuring nail seat mounted on the base, a plurality of first channels opened on the base, a first movable rod disposed in each first channel, one end of the first movable rod being connected to the inner wall of the first channel through an elastic member, the other end of the first movable rod extending out of the first channel and being provided with a patch; a locking member is mounted on the base at the pendulum, a driving member is further mounted on the pendulum, the driving member is configured to drive the switching state of the locking member, a triggering member is disposed in the first channel, and when testing is performed, the device can automatically and dynamically fit with the surface to be tested based on the specific conditions of the concrete specimen surface, thereby compensating for the unevenness error of the concrete specimen surface, and utilizing the functions of the triggering member and the driving member, when all patches trigger the triggering member, the locking member is automatically controlled to switch to the unlocked state, thereby realizing the unlocking of the pendulum and the swing striking detection work, thereby improving work efficiency.

Description

Technical Field

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

[0002] High-durability concrete is produced through quality control of raw materials and optimized production processes, using high-quality mineral fine powders and high-efficiency water reducers as essential components. The result is excellent workability, structural mechanical properties, and durability. Concrete is a common and important building material. Concrete strength is a key indicator of its quality and performance. To ensure project safety and reliability, concrete strength testing is necessary. Common methods for concrete strength testing include: Compression test: Place the concrete sample on a press and measure the compressive strength of the concrete by applying gradually increasing pressure to the sample; Tensile test: Load the concrete sample onto a tensile testing machine and measure the tensile strength of the concrete by applying tension; Shear test: Load the concrete sample onto a shear testing machine and measure the shear strength of the concrete by applying shear stress to the sample; Pendulum test: Use a pendulum to strike the measuring nail and calculate the concrete strength by the depth of the measuring nail. Among them, pendulum test is a good in-situ detection method. In the existing pendulum test experiment, the vertical plate of the pendulum hammer instrument needs to be close to the component so that the vertical plate is in a vertical position. When the component itself is not completely vertical, the adjusting screw on the pendulum hammer instrument can be adjusted to center the spirit level for manual adjustment. After confirming that the spirit level is centered and ensuring that the swing of the hammer head will not hurt the safety of the tester himself, press the trigger rod with your thumb to make the hammer head swing freely and knock the measuring nail into the concrete. After the hammer stops swinging, the penetration depth of the measuring nail is measured. If the pendulum hammer instrument slips during the test, the test is invalid and the measuring point should be re-selected for re-testing. The operation process is time-consuming and labor-intensive, and the measuring nail needs to be pulled out of the concrete after the test is completed. If foreign objects fall into the measuring hole, a hair dryer should be used to blow away the dust in the measuring hole before the depth measurement is carried out. When testing a large specimen, many test points often need to be tested, which greatly affects the test efficiency. Therefore, a strength testing device for durable concrete is urgently needed to solve the above problems. Summary of the Invention

[0003] The purpose of the present invention is to provide a strength detection device for durable concrete, which can effectively solve the problems existing in the above-mentioned prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: a durable concrete strength testing device, comprising a base for bonding with a concrete specimen, a pendulum movably mounted on the base, and a stud holder for assembling studs, the pendulum freely swinging to its lowest point to strike a stud in the stud holder; a side of the base facing the concrete specimen is provided with a plurality of first channels perpendicular to the specimen direction, each of the first channels being provided with a first movable rod, one end of the first movable rod being connected to the inner wall of the first channel via an elastic member, the other end of the first movable rod extending out of the first channel and provided with a patch; a locking member is mounted on the base at the pendulum, the locking member being configured to secure the pendulum in a locked state and to release the pendulum for downward swinging in an unlocked state;

[0005] The pendulum is also provided with a driving member, which is configured to drive the locking member to switch between an unlocked state and a locked state, and

[0006] A trigger member is provided in the first channel. When the first movable rod compresses the elastic member and moves to a certain distance, it contacts and activates the corresponding trigger member. The trigger member is connected to the driving member. When the trigger members in all the first channels are activated, the driving member drives the locking member to switch to the unlocking state.

[0007] Preferably, the triggering member includes:

[0008] a first triggering piece, arranged on the first movable rod;

[0009] a second triggering piece, disposed in the first channel and activated when the first triggering piece contacts the second triggering piece; and

[0010] A sliding groove is provided in the first channel in the moving direction of the first movable rod, and the second triggering piece is slidably installed in the second triggering piece.

[0011] Preferably, the locking member comprises:

[0012] A locking rod is provided with a limiting protrusion at one end thereof facing the movable connection of the pendulum, and a locking spring is installed at the other end of the locking rod, wherein the locking spring is configured to tend to drive the locking rod to move toward the movable connection of the pendulum and cause the limiting protrusion to restrict the swing of the pendulum to form a locked state;

[0013] The driving member can at least drive the locking rod to compress the locking spring and move the limiting protrusion away from the pendulum to switch to the unlocked state.

[0014] Preferably, the locking rod is a screw rod structure, and the driving member includes:

[0015] A first rotating wheel, wherein the first rotating wheel is engaged with the screw rod through a nut, and the first rotating wheel rotates to drive the locking rod to move through the nut;

[0016] The driving motor is configured to control the rotation of the first rotating wheel.

[0017] Preferably, the driving member further includes:

[0018] a driven gear coaxially arranged with the driving wheel;

[0019] A second rotating wheel driven by the driving motor is provided with a sector gear, and the sector gear is configured to delay the rotation time of the first rotating wheel and the second rotating wheel.

[0020] Preferably, a positioning plate is provided in each of the first channels, a connecting rod is installed on the positioning plate, one end of the connecting rod is connected to the driving member through a linkage member, and the driving member drives the linkage member to move the connecting rod, thereby controlling the positioning plate to be close to the first movable rod and fix the state of the first movable rod, or to be away from the first movable rod.

[0021] Preferably, the linkage comprises:

[0022] a rack connected to the connecting rod;

[0023] The driving gear is engaged with the gear, and the driving gear rotates to drive the rack and the connecting rod to move synchronously; the driving gear is connected to the driving member.

[0024] Preferably, the stud holder comprises:

[0025] sleeve;

[0026] The receiving ring is slidably mounted on the sleeve. A through hole is provided at the center of the receiving ring. The measuring pin passes through the through hole and enters the sleeve. As the measuring pin is forced into the test piece, the receiving ring moves synchronously in the same direction.

[0027] Preferably, the sleeve is provided with a plurality of second channels along the moving direction of the stud, a second movable rod is installed in the second channel, and one end of the second movable rod extends out of the second channel and is connected to the receiving ring;

[0028] The diameter of the force-bearing end of the measuring pin is larger than the diameter of the through hole, and the force-bearing end of the measuring pin is in magnetic contact with the receiving ring.

[0029] Preferably, a marking plate is provided in the second channel, and a marking pen is installed at one end of the second movable rod inserted into the channel. As the second movable rod moves, the marking pen moves synchronously and marks on the marking plate.

[0030] Beneficial effects: In the present invention, based on the specific conditions of the concrete specimen surface, the patch, the first movable rod and the elastic member can be used to automatically and dynamically fit the concrete specimen surface to compensate for the unevenness error of the concrete specimen surface. In addition, the trigger member and the driving member can be used to automatically control the locking member to switch to the unlocked state when all the patches trigger the trigger member, thereby unlocking the pendulum and performing the downward swing detection. There is no need to manually adjust the level by observing the bubble and then manually trigger the pendulum to swing downward, thereby improving work efficiency.

[0031] In addition, the present invention can move synchronously with the measuring nail through the functions of the sleeve, the receiving ring, the second movable rod, the marking plate and the marking pen, and the marking pen can synchronously move on the marking plate to intuitively obtain the depth of the measuring nail, thereby further improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0033] In the attached figure:

[0034] Figure 1 It is a structural schematic diagram of the concrete strength detection device of the present invention;

[0035] Figure 2 is a side view of a concrete strength testing device according to the present invention;

[0036] Figure 3 It is a front view of the concrete strength detection device of the present invention;

[0037] Figure 4 It is a structural schematic diagram of the locking rod structure of the present invention;

[0038] Figure 5 This invention Figure 3 Schematic diagram of the structure of area A;

[0039] Figure 6 It is a schematic structural diagram of the measuring nail holder of the present invention;

[0040] Figure 7 It is a side view of the stud holder of the present invention;

[0041] Numbers in the figure: 1. base; 2. pendulum; 3. measuring pin seat; 31. sleeve; 32. receiving ring; 33. through hole; 34. second channel; 35. second movable rod; 36. marking plate; 37. marking pen; 4. measuring pin; 5. first channel; 6. first movable rod; 7. elastic member; 8. patch; 9. first trigger plate; 10. second trigger plate; 11. slide groove; 12. locking rod; 13. limit protrusion; 14. locking spring; 15. rotating shaft; 16. side plate; 17. protrusion; 18. nut; 19. first rotating wheel; 20. driving motor; 21. positioning plate; 22. connecting rod; 23. driven gear; 24. second rotating wheel; 25. sector gear; 26. rack; 27. driving gear; 28. pulley assembly. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention in conjunction with the accompanying drawings. The terms used in the embodiments of the present invention are only used to explain the specific embodiments of the present invention and are not intended to limit the present invention. The following describes the embodiments of the present application in conjunction with the accompanying drawings.

[0043] Example: Figure 1 As shown, a durable concrete strength testing device includes a base 1 for bonding to a concrete specimen, a pendulum 2 movably mounted on the base 1, and a stud holder 3 for assembling a stud 4. When the pendulum 2 freely swings to its lowest point, it strikes the stud 4 in the stud holder 3. The base 1 has a plurality of first channels 5 perpendicular to the specimen on a side facing the concrete specimen. Each first channel 5 is provided with a first movable rod 6. One end of the first movable rod 6 is connected to the inner wall of the first channel 5 via an elastic member 7. The other end of the first movable rod 6 extends out of the first channel 5 and is provided with a patch 8. A locking member is mounted on the base 1 at the position of the pendulum 2. The locking member is configured to secure the pendulum 2 in a locked state and release the pendulum 2 in an unlocked state for downward swing.

[0044] A driving member is also installed on the pendulum 2, and the driving member is configured to drive the switching of the locking member to an unlocked state or a locked state, and a trigger member is provided in the first channel 5. When the first movable rod 6 compresses the elastic member 7 and moves to a certain distance, it contacts and activates the corresponding trigger member. The trigger member is connected to the driving member. When all the trigger members in the first channel 5 are activated, the driving member drives the locking member to switch to the unlocked state.

[0045] Based on the above structure, during the inspection, the substrate is placed against the surface to be tested of the concrete specimen, and the substrate is pressed to fit the surface to be tested. At this time, since the surface to be tested may be uneven, the contact time of each patch 8 is different. The patch 8 that contacts first is subjected to force to push the first movable rod 6 to compress the elastic member 7 to move. The elastic member 7 is a component with elastic effect, such as a spring. As the substrate continues to approach the side surface to be tested, each patch 8 contacts the surface to be tested and compresses the spring member, so that the trigger member is activated. At this time, based on the activation of the trigger member as a signal, the driving member starts to work and switches the state of the locking member to the unlocked state. At this time, the pendulum 2 is unlocked and starts to swing down. Generally, the angle of the pendulum 2 will be less than 90°, for example 72°. When unlocked, it will swing downward under its own gravity, and then the hammer head will hit the measuring pin 4 in the measuring pin seat 3 below to knock the measuring pin 4 into the concrete; after the hammer head stops swinging, the penetration depth of the measuring pin 4 is measured.

[0046] In a specific embodiment, for the trigger, refer to Figure 2 As shown, the trigger member includes a first trigger piece 9 and a second trigger piece 10. The first trigger piece 9 is arranged on the first movable rod 6; the second trigger piece 10 is arranged in the first channel 5, and is activated when the first trigger piece 9 contacts the second trigger piece 10; in the initial state, due to the action of the elastic member 7, the first trigger piece 9 and the second trigger piece 10 are separated. When the patch 8 on the first movable rod 6 contacts the surface to be measured, the pressure causes the first movable rod 6 to move toward the compressed elastic member 7 in the first channel 5, and the first trigger piece 9 contacts the second trigger piece 10, completing the triggering of this position. Start, and due to the different flatness of different surfaces to be tested, at this time, a slide groove 11 is provided in the first channel 5 in the moving direction of the first movable rod 6, and the second trigger piece 10 is slidably installed in the slide groove 11. After the first trigger piece 9 and the second trigger piece 10 contact, if the first movable rod 6 needs to continue to move to make way, the second trigger piece 10 will be pushed to move along the slide groove 11. When the second trigger piece 10 is required to realize the automatic reset function, a reset mechanism, such as a reset spring, can be provided on the second trigger piece 10 to control the second trigger piece 10 to reset when it is not under force.

[0047] In a specific embodiment, the locking member includes a locking rod 12, referring to Figure 3-Figure 4 , a limiting protrusion 13 is provided at one end of the locking rod 12 facing the movable connection of the pendulum 2, and a locking spring 14 is installed at the other end of the locking rod 12. The locking spring 14 is configured to tend to drive the locking rod 12 to move toward the movable connection of the pendulum 2, and to make the limiting protrusion 13 limit the swing of the pendulum 2 to form a locked state; refer to Figure 4As shown, one end of the pendulum 2 is mounted on a base 1 provided on the substrate via a rotating shaft 15. A side plate 16 is mounted at the end of the rotating shaft 15 at the position of the limiting protrusion 13. A protrusion 17 is also mounted on the side plate 16. When the pendulum 2 swings upward, the protrusion 17 squeezes the limiting protrusion 13 so that the locking rod 12 presses the locking spring 14 back, the limiting protrusion 13 contracts and gives way, and the protrusion 17 passes through the limiting protrusion 13 to the position to be lowered. The locking spring 14 recovers, and the limiting protrusion 13 extends and is locked with the protrusion 17. At this time, the pendulum 2 is in a locked state.

[0048] In one embodiment, reference Figure 4 As shown, a plurality of limiting protrusions 13 can be arranged at intervals along the downward swing path of the pendulum 2 at one end of the locking rod 12 , and the initial angle of the pendulum 2 can be adjusted by locating the protrusions 17 at different limiting protrusions 13 .

[0049] For unlocking, the locking rod 12 is driven by the driving member to compress the locking spring 14 and move the limiting protrusion 13 away from the pendulum 2 to switch to the unlocking state.

[0050] Regarding the driving mode of the driving member, in a specific embodiment, refer to Figure 4 As shown, the locking rod 12 is a screw structure, and the driving part includes a first rotating wheel 19 and a driving motor 20. The first rotating wheel 19 is engaged with the screw through the nut 18, and the first rotating wheel 19 rotates to drive the locking rod 12 to move through the nut 18; the driving motor 20 is configured to control the rotation of the first rotating wheel 19, and the rotation of the first rotating wheel 19 is controlled by the driving motor 20, so that the gear-adjusting nut 18 rotates, and the nut 18 drives the locking rod 12 to move, wherein the locking rod 12 is movably connected to the limiting protrusion 13.

[0051] In a specific embodiment, based on the above structure, a positioning piece 21 is provided in each first channel 5, and a connecting rod 22 is installed on the positioning piece 21. One end of the connecting rod 22 is connected to the driving member through a linkage member, and the driving member drives the connecting rod 22 to move, thereby controlling the positioning piece 21 to be close to the first movable rod 6 and fix the first movable rod 6 state, or to move away from the first movable rod 6. When each trigger member is activated, the driving member has two functions. The first function is to drive the above-mentioned first rotating wheel 19 to control the locking member and switch to the unlocked state, and the second function is to control the movement of the connecting rod 22 so that the positioning piece 21 is attached to the first movable rod 6, thereby fixing the position of the first movable rod 6 and avoiding the substrate from shifting during the detection process. Among them, the contact surface between the positioning piece 21 and the first movable rod 6 can be made of a material with high friction such as rubber, or it can be set as a notch, and a notch is also set on the first movable rod 6. When the two are attached, they can bite each other to improve the stability of the fixation of the first movable rod 6.

[0052] In a specific embodiment, on the basis of the above structure, the driving member also includes a driven gear 23 coaxially arranged with the driving wheel; and a second rotating wheel 24 driven by the driving motor 20, and a fan gear 25 is provided on the second rotating wheel 24, and the fan gear 25 is configured to delay the rotation time of the first rotating wheel 19 and the second rotating wheel 24; that is, utilizing the action of the fan gear 25, when the driving motor 20 is working, the connecting rod 22 is first driven to drive the positioning piece 21 to move and lock the first movable rod 6. At this time, the entire base 1 is in a stable state, and then as the driving motor 20 continues to rotate, the positioning piece 21 is a component with a certain elasticity, and the positioning piece 21 continues to increase the contact force with the first movable rod 6. At this time, the fan gear 25 rotates to engage with the driven gear 23, driving the driven gear 23 to rotate, thereby driving the locking rod 12 to move to unlock the pendulum 2, and the pendulum 2 swings down for knocking detection.

[0053] In one embodiment, reference Figure 1-Figure 2 As shown, the linkage member includes a rack 26 and a drive gear 27. The rack 26 is connected to the connecting rod 22. The drive gear 27 is engaged with the gear. The drive gear 27 rotates to drive the rack 26 and the connecting rod 22 to move synchronously. The drive gear 27 is connected to the driving member.

[0054] refer to Figure 1 As shown, the drive motor 20 is installed at the center of the base plate, and the output shaft of the drive motor 20 is connected to the drive gear 27, thereby controlling the rotation of the drive gear 27. The output shaft of the drive motor 20 is linked to the second rotation through the pulley assembly 28. One drive motor 20 realizes the above functions. Figure 1 As shown, a dual-axis driving motor 20 can be used to synchronously drive both sides, and racks 26 are provided on both sides of the driving gear 27 to achieve synchronous driving of the positioning pieces 21 at multiple positions for positioning and fixing operations.

[0055] In a specific embodiment, for the stud holder 3, refer to Figure 1 and Figure 5-Figure 6 As shown, the stylus holder 3 includes a sleeve 31 and a receiving ring 32. The sleeve 31 corresponds to the point to be measured, and the receiving ring 32 is slidably mounted on the sleeve 31. A through hole 33 is formed in the center of the receiving ring 32, and the stylus 4 passes through the through hole 33 and enters the sleeve 31. As the stylus 4 is forced into the test piece, the receiving ring 32 moves synchronously and in the same direction, thereby guiding the stylus 4 to move stably toward the surface to be measured.

[0056] Among them, a plurality of second channels 34 are opened on the sleeve 31 along the moving direction of the stylus 4, and a second movable rod 35 is installed in the second channel 34. One end of the second movable rod 35 extends out of the second channel 34 and is connected to the receiving ring 32; the diameter of the force-bearing end of the stylus 4 is larger than the diameter of the through hole 33, and the force-bearing end of the stylus 4 is in magnetic contact with the receiving ring 32. During testing, the stylus 4 can be inserted into the sleeve 31 through the through hole 33, and the force-bearing end of the stylus 4 is magnetically connected to the receiving ring 32, which can drive the receiving ring 32 to move synchronously with the movement of the stylus 4.

[0057] In order to visually observe the distance the measuring pin 4 has entered, in a specific embodiment, based on the above structure, a marking plate 36 is provided in the second channel 34. A marking pen 37 is mounted on one end of the second movable rod 35 inserted into the channel. As the second movable rod 35 moves, the marking pen 37 synchronously moves a mark on the marking plate 36. By moving the mark to the farthest distance, the distance the measuring pin 4 has entered can be visually observed. For example, a combination of a paintbrush and a drawing board can be used.

[0058] Alternatively, in a specific embodiment, the marking board 36 is a magnetic drawing board, and the brush is a magnetic pen, so that contactless marking is achieved through magnetic attraction, thereby improving the accuracy of measurement.

[0059] The above describes the embodiments of the present invention in detail with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. After knowing the contents described in the present invention, ordinary technicians in this technical field can make several equivalent changes and substitutions without departing from the principles of the present invention. These equivalent changes and substitutions should also be regarded as falling within the scope of protection of the present invention.

Claims

1. A durable concrete strength testing device comprising a base for contacting a concrete specimen, a pendulum movably mounted on the base, and a stylus holder mounted on the base for receiving a stylus, wherein the pendulum strikes a stylus in the stylus holder when it swings freely to its lowest point. The device is characterized by: The base has a plurality of first channels formed on a side facing the concrete specimen and perpendicular to the specimen direction, each of the first channels being provided with a first movable rod, one end of the first movable rod being connected to the inner wall of the first channel via an elastic member, and the other end of the first movable rod extending out of the first channel and provided with a patch; a locking member is installed on the base at the pendulum position, the locking member being configured to fix the pendulum in a locked state and to release the pendulum in an unlocked state for downward swinging; The pendulum is also provided with a driving member, which is configured to drive the locking member to switch between an unlocked state and a locked state, and A trigger member is provided in the first channel. When the first movable rod compresses the elastic member and moves to a certain distance, the trigger member contacts and activates the corresponding trigger member. The trigger member is connected to the driving member. When all the trigger members in the first channel are activated, the driving member drives the locking member to switch to the unlocking state. A locking rod is provided with a limiting protrusion at one end thereof facing the movable connection of the pendulum, and a locking spring is installed at the other end of the locking rod, wherein the locking spring is configured to tend to drive the locking rod to move toward the movable connection of the pendulum and cause the limiting protrusion to restrict the swing of the pendulum to form a locked state; The driving member can at least drive the locking rod to compress the locking spring and move the limiting protrusion away from the pendulum to switch to the unlocked state; The locking rod is a screw rod structure, and the driving member includes: A first rotating wheel, wherein the first rotating wheel is engaged with the screw rod through a nut, and the first rotating wheel rotates to drive the locking rod to move through the nut; The driving motor is configured to control the rotation of the first rotating wheel.

2. The durable concrete strength testing device according to claim 1, characterized in that: The triggering member includes: a first triggering piece, arranged on the first movable rod; a second triggering piece, disposed in the first channel and activated when the first triggering piece contacts the second triggering piece; and A sliding groove is provided in the first channel in the moving direction of the first movable rod, and the second triggering piece is slidably installed in the second triggering piece.

3. The durable concrete strength testing device according to claim 1, characterized in that: The driving member further comprises: a driven gear coaxially arranged with the first rotating wheel; A second rotating wheel driven by the driving motor is provided with a sector gear, and the sector gear is configured to delay the rotation time of the first rotating wheel and the second rotating wheel.

4. A durable concrete strength testing device according to claim 1 or 3, characterized in that: A positioning piece is provided in each of the first channels, and a connecting rod is installed on the positioning piece. One end of the connecting rod is connected to the driving member through a linkage member. The driving member drives the linkage member to move the connecting rod, and controls the positioning piece to be close to the first movable rod and fix the state of the first movable rod, or to be away from the first movable rod.

5. The durable concrete strength testing device according to claim 4, characterized in that: The linkage comprises: a rack connected to the connecting rod; A driving gear is engaged with the gear, and the driving gear rotates to drive the rack and the connecting rod to move synchronously; the driving gear is connected to the driving member.

6. The durable concrete strength testing device according to claim 1, characterized in that: The stud holder comprises: sleeve; The receiving ring is slidably mounted on the sleeve. A through hole is provided at the center of the receiving ring. The measuring pin passes through the through hole and enters the sleeve. As the measuring pin is forced into the test piece, the receiving ring moves synchronously in the same direction.

7. The durable concrete strength testing device according to claim 6, characterized in that: The sleeve is provided with a plurality of second channels along the moving direction of the stud, and a second movable rod is installed in the second channel, and one end of the second movable rod extends out of the second channel and is connected to the receiving ring; The diameter of the force-bearing end of the measuring pin is larger than the diameter of the through hole, and the force-bearing end of the measuring pin is in magnetic contact with the receiving ring.

8. The durable concrete strength testing device according to claim 7, characterized in that: A marking plate is provided in the second channel, and a marking pen is installed at one end of the second movable rod inserted into the channel. As the second movable rod moves, the marking pen moves synchronously and marks on the marking plate.

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