A dry-mixed aggregate storage device for concrete experiments

Abstract

This invention relates to the field of concrete testing equipment technology, and discloses a dry-mixed material storage device for concrete experiments. The device includes a first cylinder with an opening at the top for inputting the dry-mixed material. The top of the first cylinder has a cover capable of closing the opening. The first cylinder and the cover are fixed together by a locking mechanism. The locking mechanism includes at least one turntable rotatably mounted on the top of the cover. A connecting post is inserted into the bottom of the cover. A post slot is provided on the first cylinder. A transmission component is provided between the turntable and the connecting post. Driven by the rotation of the cover, the transmission component can drive the connecting post to be inserted into the post slot. The locking mechanism also includes a locking component and an unlocking component. By setting up the locking mechanism, the cover can be easily installed and removed from the cylinder, while ensuring a stable installation of the cover, providing a stable environment for the storage of the dry-mixed material and avoiding affecting the accuracy of subsequent concrete test results.

Description

Technical Field

[0001] This invention relates to the field of concrete experimental equipment technology, and in particular to a dry-mixed material storage device for concrete experiments. Background Technology

[0002] In concrete experiments, the dry mix used generally refers to the dry mix required in the mix proportion of the concrete test block. A dry mix is ​​prepared by mixing various raw materials such as cement, sand, and aggregates in a certain proportion before concrete preparation, and then packaging and storing the mixed dry mix for on-site mixing with water when needed. The types and proportions of dry mixes used in concrete experiments depend on the experimental requirements and the intended use of the concrete, and typically include: ordinary concrete dry mixes, high-strength concrete dry mixes, lightweight concrete dry mixes, and super-fluid concrete dry mixes.

[0003] However, in the relevant technologies, when storing ordinary dry concrete mixtures, the material is usually injected into a cylinder and then the opening of the cylinder is sealed with a cylinder cover. However, the cylinder and the cylinder cover are usually connected by a fastener such as a cylinder cover screw, which has the defects of inconvenience in disassembly and assembly and insecure installation. This cannot provide a stable environment for the storage of dry concrete mixtures, which in turn affects the accuracy of subsequent concrete test results. Summary of the Invention

[0004] To address the technical problems mentioned in the background section, the present invention provides a dry-mixed aggregate storage device for concrete experiments.

[0005] The present invention is achieved by the following technical solution: a dry-mixed material storage device for concrete experiments, comprising a first cylinder, the top of the first cylinder having an opening for input of dry-mixed material, the top of the first cylinder having a cylinder cover capable of closing the opening, and the first cylinder and the cylinder cover being fixed by a locking mechanism.

[0006] The locking mechanism includes at least one turntable, which is rotatably disposed on the top of the cylinder cover. A docking post is inserted into the bottom of the cylinder cover. A post slot is provided on the first cylinder body. A transmission component is provided between the turntable and the docking post. The transmission component is driven by the rotation of the cylinder cover and can drive the docking post to be inserted into the post slot.

[0007] The locking mechanism further includes a locking component and an unlocking component. The locking component is disposed on the docking post and can lock and fix the docking post in the post slot. The unlocking component is disposed inside the cylinder cover and is driven by the transmission component, and can release the docking post from the post slot.

[0008] As a further improvement to the above solution, the bottom of the cylinder cover is provided with a receiving groove, which can accommodate the docking post and is slidably engaged with the outer wall of the docking post.

[0009] As a further improvement to the above solution, the transmission assembly includes a second cylinder, which is concentrically fixed to the bottom of the turntable. A screw is threaded into the bottom of the second cylinder, and the bottom of the screw is fixed to the top of the docking column.

[0010] As a further improvement to the above solution, the locking assembly includes two oppositely distributed swing arms, which are rotatably and elastically inserted into the cavity at the bottom of the docking post. Each of the two swing arms has a hook extending outward from the bottom of the docking post. A hook slot is provided at the bottom of the post slot, and two guide slopes are oppositely arranged in the hook slot with a gap between them. By pressing the top slope of the guide slope with the hook, the hook is forced to deflect through the gap and then engage and fix itself to the bottom plane of the guide slope.

[0011] As a further improvement to the above solution, the top of the hook has a plane that matches the bottom plane of the guide slope; the bottom of the hook has a slope that matches the top slope of the guide slope.

[0012] As a further improvement to the above solution, a fixed axis perpendicular to the swing arm is rotatably inserted in the middle of the swing arm. The fixed axis is fixed to the inner wall of the cavity. A first spring is provided between the end of the swing arm away from the hook and the adjacent cavity wall of the cavity. When the hook deflects to the gap, the first spring is in a compressed deformation state.

[0013] As a further improvement to the above solution, the unlocking component includes a crossbar that is elastically disposed in the cavity and located above the middle of the two swing arms. Rollers are installed at both ends of the swing arms. The end of the swing arm away from the hook is centrifugally tilted to form a guide portion. By moving the crossbar downward, the rollers are driven to squeeze the guide portion, which can force the hook portion to deflect centripetally.

[0014] As a further improvement to the above solution, a sliding groove is fixed in the cavity, a slider is slidably connected in the sliding groove, a connecting rod is fixedly inserted on the slider, the bottom of the connecting rod is fixed to the top of the crossbar, and a second spring is sleeved on the outside of the connecting rod. The two ends of the second spring are respectively fixed to the top of the slider and the corresponding groove wall of the sliding groove; when the roller moves down and does not touch the guide part, the second spring is in a compressed deformation state.

[0015] As a further improvement to the above solution, a fixed plate is provided inside the cylinder cover, the second cylinder passes through the center of the fixed plate and can rotate relative to the fixed plate, a first gear is sleeved and fixed on the outside of the second cylinder, a limit groove is fixed at the bottom of the fixed plate at an inclination, a limit shaft that can move along the groove is elastically inserted in the limit groove, a second gear that always meshes with the first gear is rotatably sleeved on the limit shaft, a coil spring is inserted into the bottom of the fixed plate, a third gear that can cooperate with the second gear is sleeved and fixed on the outside of the coil, a spool is sleeved and fixed on the bottom of the third gear, a pull rope is wound on the spool, and the free end of the pull rope is bolted and fixed to the top of the connecting rod;

[0016] When the docking post disengages from the post slot, the second gear rotates in contact with the first gear and can move along the limiting groove via the limiting shaft to engage with the third gear, forcing the reel to perform rope release.

[0017] As a further improvement to the above solution:

[0018] When the docking post does not enter the post slot, under the action of the second spring force, the crossbar squeezes the guide part through the roller, forcing the hook part to deflect inward, and the pull rope is in a slack state;

[0019] When the docking post is inserted into the post slot, the pull rope begins to gradually tighten and pulls the connecting rod to move the crossbar upward to disengage from the guide part, and the compression deformation of the second spring gradually increases.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] 1. The dry-mixed material storage device for concrete experiments of the present invention, by setting a locking mechanism, can easily realize the installation and removal of the cylinder cover on the cylinder body, and at the same time can make the cylinder cover installed firmly, providing a stable environment for the storage of dry-mixed materials and avoiding affecting the accuracy of subsequent concrete test results.

[0022] 2. The dry-mixed material storage device for concrete experiments of the present invention, through the transmission component, locking component and unlocking component set in the locking mechanism, can quickly realize the installation and removal of the cylinder cover on the cylinder body by simply rotating the turntable in different directions, which is convenient and reliable. Attached Figure Description

[0023] Figure 1 This is a cross-sectional structural diagram of the dry-mixed material storage device provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Top view of the middle cylinder cover;

[0025] Figure 3 for Figure 1 A partial cross-sectional view of the structure after the middle cylinder cover and the first cylinder are locked and fixed by a locking mechanism;

[0026] Figure 4 for Figure 3 A partial cross-sectional structural diagram of the middle cylinder cover before it is locked and fixed to the first cylinder body;

[0027] Figure 5 for Figure 4 A partial cross-sectional structural diagram of the locking and fixing between the middle cylinder cover and the first cylinder;

[0028] Figure 6 for Figure 3 A partial cross-sectional structural diagram of the middle cylinder cover and the first cylinder body when the lock is engaged and then unlocked;

[0029] Figure 7 for Figure 6 A bottom view of the structure, including the central fixed plate;

[0030] Figure 8 for Figure 7 A structural diagram of the second gear and other components;

[0031] Figure 9 for Figure 3-5 A bottom view of the structure, including the central fixed plate;

[0032] Figure 10 for Figure 1 Enlarged structural diagram at point A;

[0033] Figure 11 for Figure 1 Enlarged structural diagram at point B.

[0034] Explanation of key symbols:

[0035] 1. First cylinder; 2. Cylinder cover; 3. Lower convex plate; 4. Connecting post; 5. Receiving groove; 6. Turntable; 7. Second cylinder; 8. Screw; 9. Post slot; 10. Swing arm; 11. Fixed shaft; 12. Hook; 13. Hook slot; 14. Guide slope; 15. Guide part; 16. Slide groove; 17. Slider; 18. Connecting rod; 19. Fixed plate; 20. First gear; 21. Limiting groove; 22. Limiting shaft; 23. Second gear; 24. Reel; 25. Third gear; 26. Thread pulley; 27. Crossbar; 28. Pressure rod; 29. ​​First plug groove; 30. First piston; 31. Second piston; 32. Top rod; 33. Second plug groove; 34. Third piston; 35. Annular groove; 36. Bag body; 37. Annular slot. Detailed Implementation

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] Example 1

[0038] Please combine Figures 1 to 11 A dry-mixed material storage device for concrete experiments includes a first cylinder 1, the top of the first cylinder 1 having an opening for inputting dry-mixed material, the top of the first cylinder 1 having a cylinder cover 2 capable of closing the opening, and the first cylinder 1 and the cylinder cover 2 being fixed together by a locking mechanism to facilitate the opening and closing of the cylinder cover 2 on the first cylinder 1.

[0039] The locking mechanism includes at least one turntable 6, which is rotatably disposed on the top of the cylinder cover 2. In this embodiment, a movable groove (not shown) communicating with the receiving groove 5 is opened on the top of the cylinder cover 2. A bearing seat (not shown) is provided in the movable groove, and a bearing (not shown) is installed in the bearing seat. The turntable 6 is snapped and fixed to the inner side of the bearing, and the top of the turntable 6 protrudes out of the outer side of the top of the cylinder cover 2.

[0040] In this embodiment, four turntables 6 are used as an example. The four turntables 6 are evenly arranged around the top of the cylinder cover 2. The four turntables 6 are connected by a transmission belt. By using the handle on one of the turntables 6, the other three turntables 6 can be rotated at the same time, which can improve the efficiency of disassembling and assembling the cylinder cover 2 on the first cylinder 1.

[0041] A docking post 4 is inserted into the bottom of the cylinder cover 2, and a post slot 9 is opened on the first cylinder 1. A transmission component is provided between the turntable 6 and the docking post 4. The transmission component is driven by the rotation of the cylinder cover 2, which can drive the docking post 4 to be inserted into the post slot 9, thereby completing the initial fixation of the cylinder cover 2 at the opening of the first cylinder 1.

[0042] The locking mechanism also includes a locking component and an unlocking component. The locking component is disposed on the docking post 4 and can lock and fix the docking post 4 in the post slot 9, so that the cap 2 is more firmly fixed at the opening of the first cylinder 1.

[0043] The unlocking component is located inside the cylinder cover 2 and is driven by the transmission component. It can release the locking of the docking post 4 in the post slot 9 so that the docking post 4 can be pulled out of the post slot 9, thereby opening the cylinder cover 2 from the first cylinder 1.

[0044] The bottom of the cylinder cover 2 is provided with a receiving groove 5, which can accommodate the docking post 4 and slides and engages with the outer wall of the docking post 4. In this embodiment, the cross-sections of the receiving groove 5 and the docking post 4 are both rectangular, so that the screw 8 does not rotate when driven by the rotation of the second cylinder 7, but only moves in its axial direction.

[0045] The transmission assembly includes a second cylinder 7, which is concentrically fixed to the bottom of the turntable 6. A screw 8 is threaded into the bottom of the second cylinder 7, and the bottom of the screw 8 is fixed to the top of the docking column 4.

[0046] The locking assembly includes two opposing swing arms 10, which are rotatably and elastically inserted into a cavity (not shown) at the bottom of the docking post 4. Each swing arm 10 has a hook 12 extending outwards from the bottom of the docking post 4. A hook slot 13 is provided at the bottom of the post slot 9, into which the hook 12 can enter. Two guide slopes 14 are arranged opposite each other within the hook slot 13, with a gap (not shown) between them. By pressing the top surface of the guide slope 14 with the hook 12, the hook 12 is forced to deflect through the gap and engage with the bottom plane of the guide slope 14.

[0047] The bottom of the hook 12 has a slope that matches the top slope of the guide slope 14, so that when the hook 12 is pressed against the top slope of the guide slope 14 by its slope, the hook 12 deflects inward until the hook 12 moves to the gap to pass into the hook slot 13.

[0048] The top of the hook 12 has a plane that matches the bottom plane of the guide slope 14. When the hook 12 enters the hook slot 13, the plane at the top of the hook 12 can engage and press against the bottom plane of the guide slope 14 to complete the locking and fixing of the docking post 4 in the post slot 9, further strengthening the stability of the cylinder cover 2 installed on the first cylinder 1.

[0049] A fixed shaft 11 perpendicular to the swing arm 10 is inserted in the middle of the swing arm 10. The fixed shaft 11 is fixed on the inner wall of the cavity. A first spring (not shown) is provided between the end of the swing arm 10 away from the hook 12 and the adjacent cavity wall of the cavity. When the hook 12 deflects to the gap, the first spring is in a compressed deformation state. When the hook 12 does not deflect, the first spring is in a non-deformed state.

[0050] The unlocking assembly includes a crossbar 27, which is elastically disposed in the cavity and located above the middle of the two swing arms 10. Rollers (not shown) are installed at both ends of the swing arms 10. The end of the swing arm 10 away from the hook 12 is centrifugally inclined to form a guide part 15. By moving the crossbar 27 downward, the rollers are driven to roll and squeeze the guide part 15, which can force the swing arm 10 to drive the hook 12 to deflect centripetally, so that the two hooks 12 are brought closer to each other, so that the length of the two hooks 12 together in the horizontal direction is less than the horizontal length of the gap, so that the two hooks 12 can pass through the gap.

[0051] A slide groove 16 is fixed in the cavity, and a slider 17 is slidably connected in the slide groove 16. A connecting rod 18 is fixedly inserted into the slider 17. The bottom of the connecting rod 18 is fixed to the top of the crossbar 27. A second spring (not shown) is sleeved on the outside of the connecting rod 18. The elastic force of the second spring is greater than that of the first spring. The two ends of the second spring are respectively fixed to the top of the slider 17 and the corresponding groove wall of the slide groove 16.

[0052] When the roller moves down and does not touch the guide part 15, the second spring is in a compressed deformation state. When the roller moves down and touches the guide part 15, it will squeeze the guide part 15, forcing the guide part 15 to drive the hook part 12 to deflect inward through the swing arm 10.

[0053] The cylinder cover 2 is provided with a fixed plate 19. The second cylinder 7 passes through the center of the fixed plate 19 and can rotate relative to the fixed plate 19. The fixed plate 19 has a rotating hole (not shown) at its center. The second cylinder 7 passes through the rotating hole and the outer diameter of the second cylinder 7 is smaller than the inner diameter of the rotating hole.

[0054] The first gear 20 is sleeved and fixed on the outer side of the second cylinder 7. The bottom of the fixed plate 19 is inclined and fixed with a limiting groove 21. A limiting shaft 22 that can move along the groove is elastically inserted in the limiting groove 21.

[0055] In this embodiment, the limiting shaft 22 and the limiting groove 21 are connected by a third spring (not shown). When the limiting shaft 22 is not moving, the third spring is in a non-deformed state. When the limiting shaft 22 moves in the limiting groove 21 toward the third gear 25, the third spring gradually stretches and deforms.

[0056] A second gear 23, which is always meshed with the first gear 20, is rotatably sleeved on the limiting shaft 22. A coil spring (not shown) is inserted into the bottom of the fixed disk 19 and a coil shaft 24 is inserted. A third gear 25, which can cooperate with the second gear 23, is sleeved and fixed on the outside of the coil shaft. A spool 26 is sleeved and fixed at the bottom of the third gear 25. A pull rope is wound on the spool 26 and the free end of the pull rope is bolted and fixed to the top of the connecting rod 18.

[0057] In this embodiment, the spring force on the roll 24 is greater than the spring force of the second spring, and the spring force of the second spring is greater than the spring force of the first spring.

[0058] In this embodiment, the cylinder cover 2 is installed on the first cylinder 1 in the following manner:

[0059] When it is necessary to initially fix the cap 2 onto the first cylinder 1, first place the cap 2 at the opening of the first cylinder 1, and drive the second cylinder 7 to rotate by rotating the turntable 6 counterclockwise (since the second cylinder 7 drives the first gear 20 to rotate clockwise at this time, the second gear 23 will only rotate under the limiting action of the limiting groove 21 and will not move along the groove direction of the limiting groove 21), so that it interacts with the screw 8, so that the screw 8 drives the docking post 4 to insert into the post slot 9, completing the initial fixation of the cap 2 onto the first cylinder 1. As the docking post 4 gradually enters the post slot 9, the hook 12 will touch the guide slope 14 and deflect centripetally (compressed by the first spring) and cross the gap between the guide slopes 14. Then, the top plane of the hook 12 is clamped and pressed against the bottom of the guide slope 14, thereby locking the docking post 4 in the post slot 9, and further fixing the cap 2 onto the first cylinder 1.

[0060] During this period, when the docking post 4 is not moving into the post slot 9 in the receiving groove 5, the coil spring is in a non-deformed state and the pull rope is in a slack state. The second spring in the slide groove 16 pushes the slider 17 and the connecting rod 18 to cause the roller on the crossbar 27 to squeeze the guide part 15, thus compressing the first spring and causing the hooks 12 to be in a gathered state. As the docking post 4 moves towards the post slot 9 and before the hooks 12 touch the guide slope 14, the pull rope begins to gradually tighten and pulls the connecting rod 18 to move the crossbar 27 upward to disengage from the guide part 15. Then the swing arm 10 rotates (the first spring returns to a non-deformed state) and the hooks 12 are in a separated state. At this time, the compression deformation of the second spring gradually increases.

[0061] When it is necessary to release the fixed state of the cylinder cover 2 on the first cylinder 1, the clockwise rotation of the turntable 6 drives the second cylinder 7 to rotate in the opposite direction, so that it interacts with the screw 8 through the thread, causing the screw 8 to pull the docking post 4 upward to disengage from the post slot 9. At the same time, the rotation of the second cylinder 7 drives the first gear 20 to rotate clockwise. The second gear 23 rotates under the meshing action of the first gear 20 and moves along the extension direction of the limiting groove 21 through the limiting shaft 22 to mesh with the third gear 25 and drive it to rotate (the third spring is stretched and deformed). The third gear 25 drives the pulley 26 to release the rope. At this time, due to the release of the rope, the tension of the connecting rod 18 from the rope gradually decreases. The second spring release pushes the slider 17 to move downward in the slide groove 16, so that the connecting rod 18 drives the roller on the crossbar 27 to squeeze the guide part 15, forcing the swing arm 10 to bring the hook parts 12 together to pass through the gap, thereby avoiding interference with the docking post 4 disengaging from the post slot 9.

[0062] When the hook 12 moves upward past the gap and disengages from the hook slot 13, until the docking post 4 disengages from the post slot 9 and returns to the receiving groove 5, the turntable 6 stops rotating. At this point, the second cylinder 7 will no longer drive the first gear 20 to rotate, and the first gear 20 will no longer drive the second gear 23 to rotate. At this time, the limiting shaft 22 will be pulled back to the initial position in the limiting groove 21 under the elastic force of the third spring, causing the second gear 23 to disengage from the third gear 25 and move back to the initial position. Since the third gear 25 is no longer driven by the second gear 23, the spring force on the reel 24 will be released to drive the third gear 25 to rotate, so that the reel 26 can retract the released pull rope and stretch it to the initial slack state for the next use.

[0063] Example 2

[0064] Please combine Figures 1 to 11 This embodiment is an improvement on embodiment 1. In order to improve the sealing performance of the first cylinder 1 after the cylinder cover 2 is closed, this embodiment has a pressure rod 28 inserted on the bottom wall of the column slot 9, which is parallel to the moving direction of the docking column 4. A first plug groove 29 is opened inside the cylinder wall of the first cylinder 1. A first piston 30 is provided at one end of the first plug groove 29. The bottom of the pressure rod 28 extends into the first plug groove 29 and is fixed to the top of the first piston 30. Hydraulic oil is contained in the first plug groove 29. The other end of the first plug groove 29 is bent and is in a horizontal state and a second piston 31 is provided inside. A top rod 32 is horizontally fixed on one side of the second piston 31.

[0065] The bottom of the cylinder cover 2 is fixed with a lower convex plate 3 that can extend into the first cylinder 1. The outer periphery of the lower convex plate 3 has an annular groove 35. A bladder 36 is provided at the opening of the annular groove 35 to completely close the opening. A pressurization area is formed between the inner side of the bladder 36 and the groove wall of the annular groove 35. An annular slot 37 is provided on the inner side wall of the first cylinder 1. The lower convex plate 3 has a second plug groove 33. Hydraulic oil is contained in both the second plug groove 33 and the pressurization area. One end of the second plug groove 33 is connected to the pressurization area, and the other end is bent horizontally and a third piston 34 is installed inside. The position of the third piston 34 corresponds to the position of the push rod 32.

[0066] In this embodiment, when the docking column 4 is inserted into the column slot 9, it will press the bearing rod 28 and squeeze the first piston 30, causing the first piston 30 to be hydraulically transmitted to the second piston 31 to press the push rod 32 into the horizontal inlet of the second plug groove 33 on the lower convex plate 3, thereby achieving further fixation between the cylinder cover 2 and the first cylinder 1. At the same time, the push rod 32 entering the second plug groove 33 will squeeze the third piston 34 to squeeze the hydraulic oil in the second plug groove 33 into the pressurization area, causing the bladder 36 to expand and deform and then be inserted into the annular groove 37. This not only achieves further fixation between the cylinder cover 2 and the first cylinder 1, but also, the expanded bladder pressing against the annular groove 37 can completely seal the inside of the first cylinder 1, which is beneficial for the storage of dry-mixed concrete in the concrete experiment.

[0067] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A dry mix storage apparatus for concrete experiments, characterized by, The first cylinder includes a first cylinder body, the top of which has an opening for inputting dry-mixed materials, and the top of which has a cylinder cover capable of closing the opening. The first cylinder body and the cylinder cover are fixed together by a locking mechanism. The locking mechanism includes at least one turntable, which is rotatably disposed on the top of the cylinder cover. A docking post is inserted into the bottom of the cylinder cover. A post slot is provided on the first cylinder body. A transmission component is provided between the turntable and the docking post. The transmission component is driven by the rotation of the cylinder cover and can drive the docking post to be inserted into the post slot. The locking mechanism further includes a locking component and an unlocking component. The locking component is disposed on the docking post and can lock and fix the docking post in the post slot. The unlocking component is disposed inside the cylinder cover and is driven by the transmission component, and can release the docking post from the post slot. The transmission assembly includes a second cylinder, which is concentrically fixed to the bottom of the turntable. A screw is threaded into the bottom of the second cylinder, and the bottom of the screw is fixed to the top of the docking column. The locking assembly includes two opposing swing arms, which are rotatably and elastically inserted into the cavity at the bottom of the docking post. Each swing arm has a hook extending outward from the bottom of the docking post. A hook slot is provided at the bottom of the post slot, and two guide slopes are arranged opposite each other in the hook slot, with a gap between the two guide slopes. By pressing the top surface of the guide slope with the hook, the hook is forced to deflect through the gap and then engage and fix itself to the bottom plane of the guide slope. The unlocking component includes a crossbar that is elastically disposed in the cavity and located above the middle of the two swing arms. Rollers are installed at both ends of the swing arms. The end of the swing arm away from the hook is centrifugally inclined to form a guide portion. By moving the crossbar downward, the rollers are driven to squeeze the guide portion, which can force the hook portion to deflect centripetally. A sliding groove is fixed in the cavity, and a slider is slidably connected in the sliding groove. A connecting rod is fixedly inserted on the slider, and the bottom of the connecting rod is fixed to the top of the crossbar. A second spring is sleeved on the outside of the connecting rod, and the two ends of the second spring are respectively fixed to the top of the slider and the corresponding groove wall of the sliding groove. When the roller moves down and does not touch the guide part, the second spring is in a compressed deformation state. A fixed plate is provided inside the cylinder cover. The second cylinder passes through the center of the fixed plate and can rotate relative to the fixed plate. A first gear is sleeved and fixed on the outside of the second cylinder. A limit groove is fixed at the bottom of the fixed plate at an incline. A limit shaft that can move along the groove is elastically inserted in the limit groove. A second gear that always meshes with the first gear is rotatably sleeved on the limit shaft. A coil spring is inserted into the bottom of the fixed plate. A third gear that can cooperate with the second gear is sleeved and fixed on the outside of the coil. A spool is sleeved and fixed on the bottom of the third gear. A pull rope is wound on the spool. The free end of the pull rope is bolted and fixed to the top of the connecting rod. When the docking post disengages from the post slot, the second gear rotates in contact with the first gear and can move along the limiting groove via the limiting shaft to engage with the third gear, forcing the reel to perform rope release.

2. The dry-mixed aggregate storage device for concrete experiments as described in claim 1, characterized in that, The bottom of the cylinder cover is provided with a receiving groove, which can accommodate the docking post and is slidably engaged with the outer wall of the docking post.

3. The dry-mixed asphalt storage device for concrete experiments as described in claim 1, characterized in that, The top of the hook has a plane that matches the bottom plane of the guide slope; the bottom of the hook has a slope that matches the top slope of the guide slope.

4. The dry-mixed asphalt storage device for concrete experiments as described in claim 1, characterized in that, The swing arm is rotatably inserted with a fixed shaft perpendicular to it, and the fixed shaft is fixed to the inner wall of the cavity. A first spring is provided between the end of the swing arm away from the hook and the adjacent cavity wall of the cavity. When the hook deflects to the gap, the first spring is in a compressed deformation state.

5. The dry-mixed asphalt storage device for concrete experiments as described in claim 4, characterized in that: When the docking post does not enter the post slot, under the action of the second spring force, the crossbar squeezes the guide part through the roller, forcing the hook part to deflect inward, and the pull rope is in a slack state; When the docking post is inserted into the post slot, the pull rope begins to gradually tighten and pulls the connecting rod to move the crossbar upward to disengage from the guide part, and the compression deformation of the second spring gradually increases.

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