A concrete prism asr constant humidity curing and fixed-point crack tracking device

Abstract

The utility model relates to a kind of concrete prism ASR constant-humidity maintenance and fixed-point crack tracking device, it is related to the technical field of laboratory equipment, it includes constant-humidity box, several sliding installation in constant-humidity box and are used to carry concrete prism pullout tray assembly, set in one end of pullout tray assembly and are used to the end limiting of pullout tray assembly end limiting mechanism, set in pullout tray assembly and are used to the limiting of concrete prism side limiting mechanism, for sealing constant-humidity box lid and be set on transparent observation window of lid;Pullout tray assembly includes fixed frame and the tray of sliding installation on fixed frame;Positioning groove for concrete prism is placed on tray, and side limiting mechanism is slidingly installed in positioning groove.The utility model has the effect of improving the accuracy of test results.

Description

Technical Field

[0001] This utility model relates to the field of laboratory equipment, and in particular to a device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms. Background Technology

[0002] The long-term alkali-silica reaction test of concrete prisms is an important experimental method for assessing the risk of expansion and cracking of concrete due to alkali-silica reaction under long-term high humidity conditions. This test involves curing concrete prism specimens under specified temperature and humidity conditions for an extended period, periodically measuring the length changes of the specimens, and observing the development of surface cracks to determine the durability of concrete materials under alkali-silica reaction. This provides a basis for concrete mix design and aggregate alkali-reactivity assessment.

[0003] During the experiment, concrete prism specimens are typically placed in a constant temperature and humidity chamber or curing chamber for long-term curing under specific temperature and humidity conditions. At regular intervals, the specimens are removed to measure changes in length and to observe and record the formation and propagation of cracks on the specimen surface. After observation and recording, the specimens are returned to the chamber for continued curing. This process is repeated until the end of the experimental period.

[0004] Regarding the aforementioned technologies, when measuring length and observing cracks at different ages, the placement, observation surface, and observation direction of the specimens should be kept as consistent as possible. However, existing ordinary constant temperature and humidity chambers are difficult to return to their original position and orientation when the specimens are taken out and put back in, and still need improvement. Utility Model Content

[0005] To improve the accuracy of test results, this utility model provides a device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms.

[0006] This utility model provides a constant humidity curing and fixed-point crack tracking device for concrete prisms using ASR (Automatic Sequencing) technology, which adopts the following technical solution:

[0007] A device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms includes a constant humidity chamber, several pull-out tray assemblies that are slidably installed in the constant humidity chamber and used to support the concrete prisms, an end limiting mechanism set at one end of the pull-out tray assembly for end limiting of the pull-out tray assembly, a side limiting mechanism set in the pull-out tray assembly for limiting the concrete prisms, a chamber cover for sealing the constant humidity chamber, and a transparent observation window set on the chamber cover.

[0008] The pull-out tray assembly includes a fixed frame and a tray that is slidably mounted on the fixed frame;

[0009] The tray has a positioning groove for holding the concrete prism, and the side limiting mechanism is slidably installed in the positioning groove.

[0010] The side limiting mechanism includes a baffle assembly for limiting the concrete prism, a limiting spring for driving the baffle assembly closer to the concrete prism, and a guide strip for guiding the baffle assembly to slide.

[0011] The baffle assembly includes an end baffle for limiting the end of the concrete prism and a side baffle integrally formed with the end baffle for limiting the side of the concrete prism.

[0012] Both the end baffle and the side baffle are provided with guide grooves to accommodate the guide strips.

[0013] By adopting the above technical solution, a baffle assembly consisting of an integrated end baffle and a side baffle is set up, and guide grooves for matching guide strips are opened on the end baffle and the side baffle. This allows the side limiting mechanism to slide stably along the guide strips. Under the push of the limiting spring, the concrete prism is simultaneously limited from the end and the side, achieving synchronous limiting of the prism in two directions. The structure is compact and the limiting is reliable. By setting up a constant humidity chamber, a pull-out tray assembly that slides inside the constant humidity chamber, an end limiting mechanism that limits the end of the pull-out tray assembly, and a side limiting mechanism that limits the concrete prism, the concrete prism can maintain a stable curing position inside the constant humidity chamber. The pull-out tray assembly can be slidably removed for easy specimen placement and observation. The side limiting mechanism, in conjunction with the positioning groove, limits the concrete prism, improving the positional stability and operational convenience of the specimen during curing and tracking.

[0014] Optionally, the end limiting mechanism includes a limiting seat disposed at one end of the fixed frame away from the tray pulling direction, an abutment plate slidably mounted on the limiting seat and abutting against the tray, and a buffer spring disposed between the limiting seat and the abutment plate and driving the abutment plate closer to the tray.

[0015] The limiting seat has a slot for inserting and engaging the tray, and the abutment plate is slidably installed in the slot.

[0016] By adopting the above technical solution, a limiting seat is set at the end of the fixed frame away from the tray, and an abutment plate and a buffer spring are set in the slot of the limiting seat to abut the tray. After the tray is pushed into the fixed frame, it is elastically pressed by the buffer spring, and the end of the tray is limited in the slot. This prevents the tray from sliding freely due to accidental contact or vibration during the maintenance process. At the same time, the buffer spring provides elastic cushioning to avoid rigid collision between the tray and the limiting seat.

[0017] Optionally, a condensation circulation structure may also be included within the humidity chamber;

[0018] The condensation circulation structure includes a water tank, a humidifying nozzle connected to the water tank for humidification, a guide plate inclinedly set on the top of the constant humidity chamber, a diversion groove connected to the guide plate and opened on the side wall of the constant humidity chamber, and a return water groove connected to the diversion groove for recycling condensate back to the water tank.

[0019] The guide plate has a first guiding surface that guides condensate to the diversion channel, the diversion channel has a second guiding surface that guides condensate to the return water channel, and the return water channel is inclined toward the side closer to the water tank.

[0020] By adopting the above technical solution, and by setting up a condensation circulation structure consisting of a water tank, humidifying nozzles, guide plates, diversion channels, and return water channels, the water vapor sprayed from the humidifying nozzles condenses at the top of the constant humidity chamber, then flows along the inclined guide plates through the first guide surface into the diversion channel, and then through the second guide surface of the diversion channel into the return water channel, finally flowing back to the water tank to form a circulation. This avoids the accumulation of condensate in the chamber and dripping onto the surface of the specimen, affecting observation, while realizing the recycling of water and maintaining a constant humidity environment inside the chamber.

[0021] Optionally, the lid is provided with an external camera and a movable bracket for adjusting the position of the external camera, and the movable bracket is provided with a fill light for cooperating with the external camera.

[0022] By adopting the above technical solution, by setting an external camera and a mobile bracket on the box cover, and setting a supplementary light on the mobile bracket, the external camera can acquire images of the concrete prism inside the box through a transparent observation window. The supplementary light provides supplementary illumination when there is insufficient light inside the box, ensuring the quality of the acquired images and facilitating the subsequent identification and tracking of cracks.

[0023] Optionally, the humidity chamber is provided with a reference grid assembly for providing an image reference for cracks in the concrete prism;

[0024] The reference grid assembly includes a horizontal reference grid for referencing the concrete prism in the horizontal direction and a vertical reference grid for referencing the concrete prism in the vertical direction.

[0025] By adopting the above technical solution, and by setting a reference grid assembly consisting of a horizontal reference grid and a vertical reference grid in the constant humidity chamber, the concrete prism can be referenced against the background when the image is acquired. The horizontal reference grid provides a horizontal dimension reference, and the vertical reference grid provides a vertical dimension reference. In the acquired image, the development direction and extension length of cracks can be more intuitively identified and measured, which improves the accuracy and operability of crack tracking.

[0026] Optionally, the movable support includes a fixed slide bar disposed on the case cover, a sliding slide bar that slides on the case cover, a horizontal slide bar, and a rotating base located between the horizontal slide bar and the external camera;

[0027] One end of the horizontal slide rod is fitted and slides on the fixed slide rod, and the other end of the horizontal slide rod is fitted and slides on the sliding slide rod. A locking component is provided on the horizontal slide rod.

[0028] By adopting the above technical solution, and by setting up a movable support consisting of a fixed slide rod, a sliding slide rod, a horizontal slide rod, and a rotating seat, the horizontal slide rod can slide bidirectionally along the fixed slide rod and the sliding slide rod. The external camera can adjust the shooting angle through the rotating seat, realizing multi-directional position adjustment of the external camera above the box cover. It can perform fixed-point image acquisition at different positions on the concrete prism, meeting the needs of fixed-point crack tracking.

[0029] Optionally, the locking assembly includes a rotating rod, a gripper rotatably mounted on the rotating rod, and a frustum for driving the gripper to rotate about the rotating rod;

[0030] The cone has a guide surface that drives the gripper to rotate;

[0031] The end of the gripper near the receiving surface has a beveled surface, and the end of the gripper away from the receiving surface has a gripping head for gripping the sliding slide rod;

[0032] The sliding rod has a long groove for the clamping head to clamp and fix it.

[0033] By adopting the above technical solution, and by setting a locking assembly consisting of a rotating rod, a gripper, and a truncated cone, the gripper is rotated around the rotating rod by the contact surface of the truncated cone, so that the gripping head of the gripper clamps the long groove on the sliding rod. This achieves rapid locking of the moving bracket at the selected position, preventing the external camera from shifting due to the bracket loosening during image acquisition, and ensuring the shooting accuracy of fixed-point tracking.

[0034] Optionally, a button protrudes from the end of the cone away from the gripper, and a button hole is provided on the horizontal slide bar for the button to extend and retract;

[0035] The horizontal slide bar has a sliding cavity for the cone to move up and down. The end of the cone away from the button is provided with a fixing head and a sliding head that moves up and down on the cone. The sliding cavity is provided with a return spring that drives the cone away from the gripper.

[0036] The sliding cavity is provided with a telescopic block for limiting the fixed head and a return spring for driving the telescopic block closer to the fixed head. The sliding cavity is provided with a return cavity for the telescopic block to retract.

[0037] By adopting the above technical solution, a button is set at one end of the cone, and a fixed head and a sliding head are set sequentially at the other end of the cone. A telescopic block and a return spring are set in the sliding cavity, so that the operator can control the raising and lowering of the cone by pressing the button. The telescopic block restricts or releases the fixed head under the action of the return spring, realizing the rapid locking and unlocking of the locking component. The operation is convenient and improves the work efficiency of fixed-point crack tracking.

[0038] Optionally, the transparent viewing window has an anti-fog layer.

[0039] By adopting the above technical solution, and by setting a transparent observation window on the box cover and setting an anti-fog layer on the transparent observation window, the operator can observe the cracks of the concrete prism through the observation window without opening the box cover. The anti-fog layer avoids fogging on the inner surface of the observation window caused by the temperature difference between the inside and outside of the constant humidity box, thus ensuring a clear field of view.

[0040] In summary, this utility model has at least one of the following beneficial technical effects:

[0041] 1. By setting up a constant humidity chamber, a pull-out tray assembly that slides inside the constant humidity chamber, an end-limiting mechanism that limits the pull-out tray assembly, and a side-limiting mechanism that limits the concrete prism, the concrete prism can maintain a stable curing position inside the constant humidity chamber. The pull-out tray assembly can be slid out for easy placement and observation of the specimen. The side-limiting mechanism, in conjunction with the positioning groove, limits the concrete prism, improving the positional stability and ease of operation of the specimen during curing and tracking.

[0042] 2. By setting up a condensation circulation structure consisting of a water tank, humidifying nozzles, guide plates, diversion channels, and return water tanks, the water vapor sprayed from the humidifying nozzles condenses at the top of the constant humidity chamber, then flows along the inclined guide plates through the first guide surface into the diversion channel, and then through the second guide surface of the diversion channel into the return water tank, finally flowing back to the water tank to form a circulation. This avoids the accumulation of condensate in the chamber and dripping onto the surface of the specimen, which would affect observation. At the same time, it realizes the recycling of water and maintains the constant humidity environment inside the chamber.

[0043] 3. By setting up a movable support consisting of a fixed slide bar, a sliding slide bar, a horizontal slide bar, and a rotating seat, the horizontal slide bar can slide bidirectionally along the fixed slide bar and the sliding slide bar. The external camera adjusts the shooting angle through the rotating seat, realizing multi-directional position adjustment of the external camera above the box cover. It can perform fixed-point image acquisition at different positions on the concrete prism, meeting the needs of crack fixed-point tracking. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of a concrete prism ASR constant humidity curing and fixed-point crack tracking device;

[0045] Figure 2 This is a schematic diagram of the pull-out tray assembly;

[0046] Figure 3 This is a schematic diagram of the end limit mechanism;

[0047] Figure 4 This is a schematic diagram of the side limiting mechanism;

[0048] Figure 5 This is a schematic diagram of the condensation cycle structure;

[0049] Figure 6 This is a schematic diagram of a humidity chamber;

[0050] Figure 7 This is a schematic diagram of the box lid;

[0051] Figure 8 This is a schematic diagram of the locking component;

[0052] Figure 9 This is a schematic diagram of a frustum.

[0053] The parts referred to by the numbers in the attached diagrams are as follows: 1. Humidity chamber; 2. Pull-out tray assembly; 21. Fixing frame; 22. Tray; 221. Positioning groove; 3. End limiting mechanism; 31. Limiting seat; 311. Slot; 32. Abutment plate; 33. Buffer spring; 4. Side limiting mechanism; 41. Baffle assembly; 411. End baffle; 412. Side baffle; 413. Guide groove; 42. Limiting spring; 43. Guide strip; 5. Condensation circulation structure; 51. Water tank; 52. Humidifying nozzle; 53. Flow deflector; 531. First guide surface; 54. Flow channel; 541. Second guide surface; 55. Return water channel; 6. Chamber lid; 61. Transparent viewing area. 7. Observation window; 8. External camera; 9. Movable bracket; 10. Fixed slide bar; 11. Sliding slide bar; 12. Long slot; 13. Horizontal slide bar; 14. Press hole; 15. Sliding cavity; 16. Telescopic block; 17. Return spring; 18. Retracting cavity; 19. Rotating seat; 20. Fill light; 21. Reference grid assembly; 22. Horizontal reference grid; 23. Vertical reference grid; 24. Locking assembly; 25. Rotating rod; 36. Gripper; 47. Magnifying glass; 58. Observation window; 69. External camera; 70. Movable bracket; 81. Fixed slide bar; 82. Sliding slide bar; 10. Return spring. Detailed Implementation

[0054] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0055] This utility model discloses a device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms.

[0056] Reference Figure 1 and Figure 2 A constant humidity curing and fixed-point crack tracking device for concrete prisms includes a constant humidity chamber 1 and several pull-out tray assemblies 2. The constant humidity chamber 1 provides a constant humidity environment for the test, and the pull-out tray assemblies 2 are slidably installed inside the constant humidity chamber 1 to support the concrete prism specimens.

[0057] Reference Figure 3 and Figure 4 A device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms further includes an end limiting mechanism 3 and a side limiting mechanism 4. The end limiting mechanism 3 is disposed at one end of the pull-out tray assembly 2 to limit the end of the pull-out tray assembly 2. The side limiting mechanism 4 is disposed inside the pull-out tray assembly 2 to limit the concrete prism laterally.

[0058] Reference Figure 2 The pull-out tray assembly 2 includes a fixing frame 21 and a tray 22. The fixing frame 21 is fixedly installed inside the humidity chamber 1, and the tray 22 is slidably installed on the fixing frame 21, and can be pulled out or pushed in horizontally for easy placement or removal of the concrete prism. A positioning groove 221 is provided on the tray 22, and the concrete prism is placed in the positioning groove 221. A side limiting mechanism 4 is slidably installed in the positioning groove 221, and its position can be adjusted according to the actual size of the concrete prism.

[0059] Reference Figure 2 and Figure 3 The end-limiting mechanism 3 includes a limiting seat 31, an abutment plate 32, and a buffer spring 33. The limiting seat 31 is fixedly disposed at the end of the fixing frame 21 away from the end where the tray 22 is pulled out. The abutment plate 32 is slidably mounted on the limiting seat 31 and abuts against the end of the tray 22. The buffer spring 33 is disposed between the limiting seat 31 and the abutment plate 32, and always applies an elastic force close to the tray 22 to the abutment plate 32. A slot 311 is provided on the limiting seat 31, and the end of the tray 22 is inserted into the slot 311, and the abutment plate 32 is slidably mounted in the slot 311. When the tray 22 is pushed into the fixing frame 21, the end of the tray 22 abuts against the abutment plate 32, the buffer spring 33 is compressed, and elastic buffering and end-limiting are formed on the tray 22 to prevent the tray 22 from sliding freely during the maintenance process.

[0060] Reference Figure 2 and Figure 4The side limiting mechanism 4 includes a baffle assembly 41, a limiting spring 42, and a guide strip 43. The baffle assembly 41 is used to limit the concrete prism, the limiting spring 42 is used to drive the baffle assembly 41 closer to the concrete prism, and the guide strip 43 is disposed in the tray 22 to guide the sliding of the baffle assembly 41. The baffle assembly 41 includes an end baffle 411 and a side baffle 412. The end baffle 411 is used to limit the end of the concrete prism, and the side baffle 412 is integrally formed with the end baffle 411 to limit the side of the concrete prism. Both the end baffle 411 and the side baffle 412 are provided with guide grooves 413, and the guide strip 43 is embedded in the guide grooves 413, so that the baffle assembly 41 can slide stably along the guide strip 43. Under the elastic push of the limiting spring 42, the end baffle 411 and the side baffle 412 limit the concrete prism from the end and the side respectively, ensuring that the specimen is stable in the positioning groove 221.

[0061] Reference Figure 5 and Figure 6 The humidity chamber 1 also includes a condensation circulation structure 5. The condensation circulation structure 5 comprises a water tank 51, a humidifying nozzle 52, a guide plate 53, a drainage channel 54, and a return water tank 55. The water tank 51 is located at the bottom of the humidity chamber 1 and contains a built-in water pump. The humidifying nozzle 52 is connected to the water pump in the water tank 51 to spray water mist into the humidity chamber 1 to maintain humidity. The guide plate 53 is inclined at the top of the humidity chamber 1 to collect condensate from the top of the chamber. The drainage channel 54 is located on the side wall of the humidity chamber 1 and connected to the guide plate 53. The return water tank 55 is connected to the drainage channel 54 to return the condensate to the water tank 51. The guide plate 53 has a first guiding surface 531 to guide the condensate to the drainage channel 54. The drainage channel 54 has a second guiding surface 541 to guide the condensate to the return water tank 55. The return water tank 55 is tilted towards the side closer to the water tank 51, allowing the condensate to flow back into the water tank 51 naturally by gravity. Through the condensate circulation structure 5, the condensate will not drip onto the concrete prism specimen and affect observation, while also realizing the recycling of water.

[0062] A reference grid assembly 10 is installed inside the humidity chamber 1. The reference grid assembly 10 is directly snapped or plugged into the inner wall of the humidity chamber 1. The reference grid assembly 10 includes a horizontal reference grid 101 and a vertical reference grid 102. The horizontal reference grid 101 provides a dimensional reference for the concrete prism in the horizontal direction, and the vertical reference grid 102 provides a dimensional reference for the concrete prism in the vertical direction. When the external camera 7 acquires images through the transparent viewing window 61, the concrete prism is framed by the reference grid assembly 10, with grid references in both the horizontal and vertical directions. This allows for intuitive identification and measurement of the crack development direction and extension length in the image, improving the accuracy and operability of crack tracking.

[0063] Reference Figure 1 and Figure 7 The humidity chamber 1 is equipped with a cover 6, which is used to seal the humidity chamber 1. The cover 6 has a transparent observation window 61, which allows the operator to observe the specimens inside the chamber from the outside without opening the cover 6. The surface of the transparent observation window 61 is equipped with an anti-fog layer to prevent fogging on the inner surface of the observation window caused by the temperature difference between the inside and outside of the humidity chamber 1.

[0064] Reference Figure 7 and Figure 8 An external camera 7 and a movable support 8 are installed on the lid 6 of the test chamber. The external camera 7 is used to acquire images of cracks in the concrete prism through the transparent observation window 61. The movable support 8 is used to adjust the position of the external camera 7 above the lid 6, so that the camera can be aimed at the specimen at different locations. A supplementary light 9 is also installed on the movable support 8. The supplementary light 9 works in conjunction with the external camera 7 to provide supplementary lighting when the light inside the chamber is insufficient, ensuring the quality of the acquired images.

[0065] Reference Figure 7 and Figure 8 The movable support 8 includes a fixed slide bar 81, a sliding slide bar 82, a horizontal slide bar 83, and a rotating base 84. The fixed slide bar 81 is fixedly mounted on the cover 6. The sliding slide bar 82 is slidably mounted on the cover 6. One end of the horizontal slide bar 83 is fitted onto and slides on the fixed slide bar 81, and the other end of the horizontal slide bar 83 is fitted onto and slides on the sliding slide bar 82. The rotating base 84 is located between the horizontal slide bar 83 and the external camera 7, allowing the external camera 7 to rotate around the rotating base 84 to adjust the shooting angle. A locking component 11 is provided on the horizontal slide bar 83 to lock the position after the horizontal slide bar 83 moves to the selected position.

[0066] The locking assembly 11 includes a rotating rod 111, a gripper 112, and a truncated cone 113. The rotating rod 111 passes through a horizontal slide bar 83. The gripper 112 is rotatably mounted on the rotating rod 111. The truncated cone 113 is located at one end of the gripper 112 and is used to drive the gripper 112 to rotate around the rotating rod 111. The truncated cone 113 has a receiving surface 1131, the end of the gripper 112 near the receiving surface 1131 has a beveled surface 1121, and the end of the gripper 112 away from the receiving surface 1131 has a clamping head 1122. A long slot 821 is formed on the sliding slide bar 82, and the clamping head 1122 is used to clamp and fix it in the long slot 821. When the truncated cone 113 moves axially, the receiving surface 1131 of the truncated cone 113 pushes the inclined contact surface 1121 of the gripper 112, causing the gripper 112 to rotate around the rotating rod 111, and the clamping head 1122 clamps the sliding slide rod 82, thereby locking the position of the horizontal slide rod 83.

[0067] Reference Figure 8 and Figure 9A button 1132 protrudes from the end of the truncated cone 113 away from the gripper 112. A button hole 831 for extending and retracting the button 1132 is provided on the horizontal slide rod 83. A sliding cavity 832 is provided on the horizontal slide rod 83, and the truncated cone 113 slides up and down within the sliding cavity 832. A fixing head 1133 and a sliding head 1134 are sequentially provided at the end of the truncated cone 113 away from the button 1132. The sliding head 1134 slides on the truncated cone 113 and is located above the fixing head 1133. A return spring 1135 is provided in the sliding cavity 832 to drive the truncated cone 113 to slide out of the sliding cavity 832. The return spring 1135 drives the truncated cone 113 away from the gripper 112.

[0068] The sliding cavity 832 is equipped with a telescopic block 833 and a return spring 834. The return spring 834 is located between the telescopic block 833 and the inner wall of the sliding cavity 832, constantly driving the telescopic block 833 closer to the fixed head 1133. The sliding cavity 832 also has a return cavity 835 for the telescopic block 833 to retract. When the button 1132 is pressed, the cone 113 moves along the sliding cavity 832 towards the gripper 112, and the fixed head 1133 pushes the telescopic block 833 back into the return cavity 835. When the cone 113 is in position, the telescopic block 833 extends under the action of the return spring 834 and locks the upper end face of the fixed head 1133. The fixed head 1133 is restricted by the telescopic block 833 and cannot retract, thus achieving locking. When unlocking is required, press button 1132 again. The cone 113 continues to move closer to the gripper 112, driving the sliding head 1134 to push the telescopic block 833 back into the return cavity 835, thus freeing the telescopic block 833 from restricting the fixed head 1133. Releasing button 1132 at this point causes the return spring 1135 to return the cone 113 to its original position away from the gripper 112, releasing the lock. The sliding head 1134 and the fixed head 1133 are both restricted from retraction by the telescopic block 833, but the inclined surface of the sliding head 1134 abuts against the telescopic block 833, and together with the fixed head 1133, it is freed from the restriction of the telescopic block 833, thereby resetting the cone 113 and releasing the lock.

[0069] The working principle of this embodiment is as follows: During use, the tray 22 is first pulled out from the fixing frame 21, and the concrete prism specimen is placed into the positioning groove 221. The side limiting mechanism 4, pushed by the limiting spring 42, limits the specimen from the end and side. Then, the tray 22 is pushed into the fixing frame 21, and the end of the tray 22 abuts against the abutment plate 32 of the end limiting mechanism 3. Under the elastic action of the buffer spring 33, the end of the tray 22 is limited. The box cover 6 is closed, the condensation circulation structure 5 is activated, and the humidifying nozzle 52 sprays water mist into the box to maintain a constant humidity environment. During curing, the condensate condensed at the top of the box flows back to the water tank 51 along the guide plate 53, the drainage channel 54, and the return water channel 55 for recycling.

[0070] When crack tracking is required, the position of the external camera 7 is adjusted by moving the support 8. The horizontal slide bar 83 slides along the fixed slide bar 81 and the sliding slide bar 82, and the rotating base 84 adjusts the shooting angle of the external camera 7 so that the camera is aimed at the area to be observed on the concrete prism. The supplementary light 9 provides additional illumination when light is insufficient. The external camera 7 acquires images through the transparent viewing window 61. The concrete prism is framed against the reference grid assembly 10, and the cracks are referenced by the grid in both the horizontal and vertical directions, facilitating subsequent measurement and tracking.

[0071] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A device for ASR constant humidity curing and fixed-point crack tracking of concrete prisms, characterized in that, It includes a constant humidity chamber (1), several pull-out tray assemblies (2) that are slidably installed in the constant humidity chamber (1) and used to support concrete prisms, an end limiting mechanism (3) set at one end of the pull-out tray assembly (2) and used to limit the end of the pull-out tray assembly (2), a side limiting mechanism (4) set in the pull-out tray assembly (2) and used to limit the concrete prisms, a box cover (6) for sealing the constant humidity chamber (1), and a transparent observation window (61) set on the box cover (6); The pull-out tray assembly (2) includes a frame (21) and a tray (22) slidably mounted on the frame (21). The tray (22) is provided with a positioning groove (221) for holding the concrete prism, and the side limiting mechanism (4) is slidably installed in the positioning groove (221); The side limiting mechanism (4) includes a baffle assembly (41) for limiting the concrete prism, a limiting spring (42) for driving the baffle assembly (41) closer to the concrete prism, and a guide strip (43) for guiding the baffle assembly (41) to slide. The baffle assembly (41) includes an end baffle (411) for limiting the end of the concrete prism and a side baffle (412) integrally formed with the end baffle (411) and for limiting the side of the concrete prism. Both the end baffle (411) and the side baffle (412) are provided with guide grooves (413) that cooperate with the guide strip (43).

2. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 1, characterized in that, The end limiting mechanism (3) includes a limiting seat (31) disposed at one end of the fixed frame (21) away from the tray (22) in the pulling direction, an abutment plate (32) slidably mounted on the limiting seat (31) and abutting against the tray (22), and a buffer spring (33) disposed between the limiting seat (31) and the abutment plate (32) and driving the abutment plate (32) to approach the tray (22). The limiting seat (31) is provided with a slot (311) for the tray (22) to be inserted and fitted, and the abutment plate (32) is slidably installed in the slot (311).

3. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 1, characterized in that, It also includes a condensation circulation structure (5) installed inside the humidity chamber (1); The condensation circulation structure (5) includes a water tank (51), a humidifying nozzle (52) connected to the water tank (51) and used for humidification, a guide plate (53) inclinedly arranged on the top of the constant humidity chamber (1), a diversion channel (54) connected to the guide plate (53) and opened on the side wall of the constant humidity chamber (1), and a return water channel (55) connected to the diversion channel (54) and used to recover condensate to the water tank (51). The guide plate (53) has a first guide surface (531) that guides condensate to the diversion channel (54), the diversion channel (54) has a second guide surface (541) that guides condensate to the return water channel (55), and the return water channel (55) is inclined toward the side closer to the water tank (51).

4. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 1, characterized in that, An external camera (7) and a movable bracket (8) for adjusting the position of the external camera (7) are provided on the lid (6). A fill light (9) for the external camera (7) is provided on the movable bracket (8).

5. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 4, characterized in that, The constant humidity chamber (1) is provided with a reference grid assembly (10) for providing image reference for cracks in concrete prisms. The reference grid assembly (10) includes a horizontal reference grid (101) for referencing the concrete prism in the horizontal direction and a vertical reference grid (102) for referencing the concrete prism in the vertical direction.

6. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 5, characterized in that, The movable support (8) includes a fixed slide bar (81) disposed on the box cover (6), a sliding slide bar (82) slidably mounted on the box cover (6), a horizontal slide bar (83), and a rotating seat (84) located between the horizontal slide bar (83) and the external camera (7). One end of the horizontal slide rod (83) is fitted and slides on the fixed slide rod (81), and the other end of the horizontal slide rod (83) is fitted and slides on the sliding slide rod (82). A locking component (11) is provided on the horizontal slide rod (83).

7. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 6, characterized in that, The locking assembly (11) includes a rotating rod (111), a gripper (112) rotatably mounted on the rotating rod (111), and a truncated cone (113) for driving the gripper (112) to rotate about the rotating rod (111). The truncated cone (113) has a receiving surface (1131) that drives the gripper (112) to rotate. The jaw (112) has a beveled surface (1121) at one end near the receiving surface (1131), and a clamping head (1122) for clamping the sliding slide bar (82) at the other end of the jaw (112) away from the receiving surface (1131). The sliding rod (82) has a long groove (821) for clamping and fixing the clamping head (1122).

8. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 7, characterized in that, The cone (113) has a button (1132) protruding from one end away from the gripper (112), and the horizontal slide bar (83) has a button hole (831) for the button (1132) to extend and retract. The horizontal slide bar (83) is provided with a sliding cavity (832) for the cone (113) to slide up and down. The end of the cone (113) away from the button (1132) is provided with a fixing head (1133) and a sliding head (1134) that slides up and down on the cone (113). The sliding cavity (832) is provided with a return spring (1135) that drives the cone (113) away from the gripper (112). The sliding cavity (832) is provided with a telescopic block (833) for limiting the fixed head (1133) and a return spring (834) for driving the telescopic block (833) to approach the fixed head (1133). The sliding cavity (832) is provided with a retraction cavity (835) for the telescopic block (833) to retract.

9. The ASR constant humidity curing and fixed-point crack tracking device for concrete prisms according to claim 1, characterized in that, The transparent viewing window (61) has an anti-fog layer.

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