Detection device for accurately measuring concrete slump

Abstract

The invention relates to a detection device for accurately measuring concrete slump, and belongs to the field of concrete slump detection. The device comprises a base, a bottom plate and a slump cylinder; the bottom plate is detachably arranged above the base; a telescopic unit is rotationally arranged on the base; a plurality of pieces of wiping cloth are uniformly arranged on the peripheral side of the telescopic unit; the multiple pieces of wiping cloth abut against the inner wall of the slump cylinder. A water supply unit is arranged on the base; the water supply unit is used for wetting a plurality of dry cloths; a plurality of drying plates are arranged on the top wall of the base; the multiple drying plates are evenly distributed in the circumferential direction of the telescopic unit. After the telescopic unit moves downwards, the multiple pieces of wiping cloth abut against the plate faces of the multiple drying plates; the device has the technical effects that the wiping efficiency of the upper water of the slump cylinder is improved, and the detection precision is improved.

Description

Technical Field

[0001] This application relates to the technical field of concrete slump testing, and in particular to a testing device for accurately measuring concrete slump. Background Technology

[0002] In the field of construction engineering, concrete slump is a key indicator for measuring the workability and fluidity of fresh concrete, and its accuracy directly affects the construction quality and final structural strength. Currently, slump tests are mainly conducted according to standard methods: fresh concrete is filled into a standard-sized conical slump cone in three layers, each layer needs to be compacted, and then the slump cone is lifted vertically. The concrete will slump to a certain extent due to its own weight, and the height difference is the slump value.

[0003] Before filling with concrete, the inner wall of the slump cone must be kept moist but without excess standing water, and any solidified concrete debris left from the previous test must be removed. If the inner wall is too dry, it will absorb moisture from the surface of the fresh concrete, increasing the frictional resistance between the concrete and the cone wall, resulting in a lower slump value after lifting the cone and causing a negative deviation in the measurement results.

[0004] Currently, operators use damp cloths to wipe and moisten the slump test cylinders, which is inefficient due to the following reasons: manual operation is required before each test, which prolongs the overall testing time; the strength and uniformity of manual wiping are difficult to guarantee, and some areas may be too wet while others remain dry or have residue; different operators have different habits, which leads to differences in the pretreatment state of the cylinder wall, introducing measurement errors caused by human factors, and making it difficult to ensure the consistency of test conditions for each test.

[0005] Patent (202510685420.6) discloses a slump testing device for concrete, including... The invention includes a tamping mechanism and a lifting support installed on the outside of the tamping mechanism. The bottom of the tamping mechanism has a tamping fixing mechanism, and the inner sides of the tamping fixing mechanism have longitudinal threaded sleeves. The tamping mechanism includes a first rotating support, with a first rotating motor fixedly installed on the outside of the first rotating support. The output end of the first rotating motor is fixedly connected to a first rotating worm, and one side of the first rotating worm is meshed with a first rotating worm wheel. The patent improves work efficiency by using mechanical methods to replace manual tamping of concrete; however, the removal of standing water on the slump cone still requires manual wiping, affecting the test results.

[0006] Regarding the aforementioned technologies, the inventors believe that there is a defect in the measurement error caused by manually wiping the slump cylinder. Summary of the Invention

[0007] To address the aforementioned technical problems, this application provides a detection device for accurately measuring the slump of concrete, employing the following technical solution: A device for accurately measuring the slump of concrete includes a base, a bottom plate, and a slump cylinder. The bottom plate is detachably mounted on top of the base. A telescopic unit is rotatably mounted on the base. Multiple wiping cloths are evenly distributed around the periphery of the telescopic unit. Each of the multiple wiping cloths abuts against the inner wall of the slump cylinder. A water supply unit is mounted on the base to wet the multiple wiping cloths. Multiple drying plates are mounted on the top wall of the base. The multiple drying plates are evenly distributed along the periphery of the telescopic unit. After the telescopic unit moves downward, the multiple wiping cloths abut against the surfaces of the multiple drying plates.

[0008] By adopting the above technical solution, and by setting up a water supply unit, multiple drying plates, and multiple wiping cloths, the wetting and drying effects of the wiping cloths are achieved. The rotating telescopic unit can remove the standing water on the slump cylinder with the wiping cloths before the concrete slump test, and ensure that the inner wall of the slump cylinder is moistened, avoiding the influence of standing water on the flowability of the concrete, improving the test accuracy, solving the problem of time-consuming and laborious manual wiping of the test cylinder, and improving work efficiency. The rotating telescopic unit can also work with multiple drying plates to wring out multiple wiping cloths. The multiple drying plates have a simple structure and are easy to maintain and replace. After the concrete slump test is completed, the base plate is removed from the base, and the slump cylinder is placed on the base. By setting up the telescopic unit, it retracts into the base during the concrete slump test, avoiding interference with the concrete slump test process.

[0009] Preferably, the telescopic unit includes a rotating cylinder, a first sleeve, and a second sleeve; the rotating cylinder is rotatably mounted on the base; the first sleeve is slidably mounted inside the rotating cylinder; the second sleeve is slidably mounted inside the first sleeve; one end of the wiping cloth is mounted on the top of the second sleeve, and the other end is mounted on the top of the rotating cylinder.

[0010] Preferably, a drying groove is formed on the top wall of the base; multiple drying plates are located in the drying groove; and multiple drainage grooves communicating with the outside are formed on the side wall of the drying groove.

[0011] By adopting the above technical solution, the moisture falling from the drying cloth by twisting the drying plate is collected by setting a drying trough and discharged through multiple drainage troughs, thereby improving the drying effect of the wiping cloth.

[0012] Preferably, an annular wastewater trough is formed on the top wall of the base; multiple drainage holes are formed on the bottom wall of the annular wastewater trough; and the drainage trough is connected to the annular wastewater trough.

[0013] By adopting the above technical solution, the annular wastewater tank can collect the wastewater falling from the slump cylinder during cleaning and discharge it through the drain hole, thus preventing the wastewater from accumulating on the base and contaminating the bottom of the slump cylinder, thereby improving the cleaning effect of the slump cylinder.

[0014] Preferably, a counterweight plate is provided on the top wall of the second sleeve; after the second sleeve slides down, the counterweight plate is used to seal the drying tank.

[0015] By adopting the above technical solution, multiple drying cloths are squeezed into the drying trough by setting a counterweight plate and sealing the drying trough to form an independent drying space, which prevents the water discharged from the drying cloth from splashing onto the inner wall of the monitoring cylinder; the counterweight plate can also protect the drying cloth and the telescopic unit, preventing external sludge from contaminating them when the drying cloth and the telescopic unit are not working.

[0016] Preferably, the base has an interconnected water supply channel and a drive cavity; the water supply unit includes a water pump and multiple force plates; the water pump and the water supply channel are connected; the multiple force plates are evenly arranged on the side wall of the rotating drum along the circumference; the multiple force plates are all located in the drive cavity; after the rotating drum rotates, any one of the force plates is located in the drive cavity.

[0017] By adopting the above technical solution, by opening a water supply channel and a drive chamber on the base, and setting multiple force plates on the rotating drum, the water supply unit can make full use of water energy to drive the rotating drum to rotate. While supplying water to the wiping cloth, it can also drive the wiping cloth to wipe the slump cylinder, which greatly improves the energy utilization rate.

[0018] Preferably, the interiors of the rotating drum, the first sleeve, and the second sleeve are connected in sequence; a buffer cavity is provided on the base; the buffer cavity is connected to the water supply channel and the interior of the rotating drum.

[0019] By adopting the above technical solution, the water flowing through the water supply channel is sequentially introduced into the rotating drum, the first sleeve, and the second sleeve by adding a buffer chamber, thereby extending the telescopic unit and reusing the water after driving the telescopic unit to rotate, further improving the utilization rate of the water supply unit.

[0020] Preferably, the second sleeve has a plurality of drainage holes communicating with the outside on its side wall.

[0021] By adopting the above technical solution, the drain hole can relieve pressure inside the telescopic unit. At the same time, the water discharged from the drain hole, in conjunction with the rotation of the telescopic unit, can clean the wiping cloth and the slump cylinder. This allows the water supply unit to simultaneously drive the extension and rotation of the telescopic unit, as well as to achieve the humidification and cleaning effect on the wiping cloth and the slump cylinder, thus realizing the fully automated flow operation of the equipment.

[0022] Preferably, the base is equipped with an air pump; both the air pump and the water pump are connected to the water supply channel.

[0023] By adopting the above technical solution, after the water supply unit cleans the wiping cloth and slump cylinder, the water pump is turned off and the air pump is turned on to achieve the rotation and extension effect of the telescopic unit. After the air pump drives the telescopic unit to rotate, the buffer chamber will continue to buffer the gas first, so that the telescopic unit can extend after rotating for a period of time. During the rotation of the telescopic unit, the drying plate will wring out the wet wiping cloth. After the telescopic unit extends, the dry wiping cloth will wipe away the water on the inner wall of the slump cylinder, so that the drying of the wiping cloth and the wiping work are smoothly connected. The drain hole on the second sleeve can also discharge the gas in the telescopic unit and blow the wiping cloth towards the inner wall of the test cylinder, improving the wiping efficiency of the wiping cloth.

[0024] Preferably, the regulating seat is provided with an air hole, a water hole, an air hole switch, and a water hole switch; the air hole and the water hole are both connected to the water supply channel; the air hole switch is rotatably disposed in the air hole; the water hole switch is rotatably disposed in the water hole.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting up a water supply unit, multiple drying plates, and multiple wiping cloths, the system achieves both wetting and drying effects on the wiping cloths. The rotating telescopic unit removes standing water from the slump cylinder before concrete slump testing using the wiping cloths, ensuring the inner wall of the cylinder remains moist. This prevents standing water from affecting the flowability of the concrete, improves testing accuracy, and solves the problem of time-consuming and laborious manual wiping of the test cylinder, thus increasing work efficiency. The rotating telescopic unit can also work with multiple drying plates to wring out the wiping cloths. The multiple drying plates have a simple structure and are easy to maintain and replace. After the concrete slump test is completed, the base plate is removed from the base, and the slump cylinder is placed on the base. By setting up the telescopic unit, it retracts into the base during concrete slump testing, avoiding interference with the concrete slump testing process.

[0026] 2. By opening a water supply channel and a drive chamber on the base and setting multiple force plates on the rotating drum, the water supply unit can fully utilize water energy to drive the rotating drum to rotate. While supplying water to the wiping cloth, it can also drive the wiping cloth to wipe the slump cylinder, greatly improving the energy utilization rate. The drain hole can relieve pressure inside the telescopic unit. At the same time, the water discharged from the drain hole, in conjunction with the rotation of the telescopic unit, can clean the wiping cloth and the slump cylinder. After the water supply unit is driven, it can simultaneously satisfy the needs of driving the extension and rotation of the telescopic unit, as well as satisfy the humidification and cleaning effects of the wiping cloth and the slump cylinder, realizing the fully automated flow operation of the equipment.

[0027] 3. After the water supply unit cleans the wiping cloth and slump cylinder, the water pump is turned off and the air pump is turned on to achieve the rotation and extension effect of the telescopic unit. After the air pump drives the telescopic unit to rotate, the buffer chamber will continue to buffer the gas, so that the telescopic unit can extend after rotating for a period of time. During the rotation of the telescopic unit, the drying plate will wring out the wet wiping cloth. After the telescopic unit extends, the dry wiping cloth will wipe away the water on the inner wall of the slump cylinder, so that the drying of the wiping cloth and the wiping work are smoothly connected. The drain hole on the second sleeve can also discharge the gas in the telescopic unit and blow the wiping cloth towards the inner wall of the test cylinder, improving the wiping efficiency of the wiping cloth. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a testing device for accurately measuring the slump of concrete.

[0029] Figure 2 This is a schematic diagram of the internal structure of the base in the embodiment.

[0030] Figure 3 This is a schematic diagram of the external structure of the base in the embodiment.

[0031] Figure 4 This is a schematic diagram of the drying plate in the embodiment.

[0032] Figure 5 This is a schematic diagram of the water supply channel in the embodiment.

[0033] Figure 6 This is a schematic diagram of the telescopic unit in the embodiment.

[0034] Explanation of reference numerals in the attached figures: 1. Base; 11. Drying plate; 12. Drying trough; 121. Drainage trough; 13. Annular wastewater trough; 131. Drainage hole; 14. Water supply channel; 15. Drive chamber; 16. Buffer chamber; 2. Base plate; 3. Slump cone; 4. Telescopic unit; 41. Rotating drum; 411. Force plate; 42. First sleeve; 43. Second sleeve; 431. Counterweight plate; 432. Drain hole; 5. Wiping cloth. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0036] This application discloses a detection device for accurately measuring the slump of concrete. (Refer to...) Figure 1-4The system includes a base 1, a base plate 2, a slump cylinder 3, a telescopic unit 4, and a water supply unit. The base plate 2 is detachably mounted on top of the base 1. The telescopic unit 4 is rotatably mounted on the base 1. Multiple wiping cloths 5 are evenly arranged around the periphery of the telescopic unit 4. The multiple wiping cloths 5 respectively abut against the inner wall of the slump cylinder 3. The water supply unit is mounted on the base 1. The water supply unit wets multiple drying cloths. A drying groove 12 is formed on the top wall of the base 1. Multiple drainage grooves 121 communicating with the outside are formed on the side wall of the drying groove 12. An annular wastewater groove 1 is formed on the top wall of the base 1. 3; The bottom wall of the annular wastewater tank 13 is provided with multiple drain holes 131; The annular wastewater tank 13 surrounds the outside of the drying tank 12, and the drain trough 121 can communicate with the annular wastewater tank 13 so that the water in the drying tank 12 is first discharged into the annular wastewater tank 13 and then discharged to the outside of the base 1; Multiple drying plates 11 are provided in the drying tank 12; The multiple drying plates 11 are evenly distributed along the circumference of the telescopic unit 4; After the telescopic unit 4 moves down, multiple wiping cloths 5 abut against the surface of the multiple drying plates 11, and when the telescopic unit 4 rotates, it can twist the wiping cloths 5, thereby wringing the wiping cloths 5 dry.

[0037] Reference Figure 2 and Figure 6 The telescopic unit 4 includes a rotating cylinder 41, a first sleeve 42, and a second sleeve 43. The rotating cylinder 41 is rotatably mounted on the base 1. The first sleeve 42 is slidably mounted inside the rotating cylinder 41. The second sleeve 43 is slidably mounted inside the first sleeve 42. One end of the wiping cloth 5 is mounted on the top of the second sleeve 43, and the other end is mounted on the top of the rotating cylinder 41. A counterweight plate 431 is provided on the top wall of the second sleeve 43. After the second sleeve 43 slides down, the counterweight plate 431 is used to close the drying chamber 12 and squeeze and completely stack the wiping cloth 5 inside the drying chamber 12, so that the drying plate 11 fully twists the wiping cloth 5 and improves the drying effect of the wiping cloth 5.

[0038] Reference Figure 2 and Figure 5The water supply unit includes a water pump and multiple load-bearing plates 411; a water pump is installed on the base 1, and both the air pump and the water pump are connected to the water supply channel 14; the output ends of the air pump and the water pump are equipped with one-way valves. A water supply channel 14 and a drive chamber 15 are interconnected within the base 1. The water pump's inlet is connected to a water source, and the other end is connected to the water supply channel 14. The water source can be a water tank at the testing site or other stored water. Multiple force plates 411 are evenly arranged circumferentially on the side wall of the rotating drum 41. All force plates 411 are located within the drive chamber 15. After the rotating drum 41 rotates, any force plate 411 is located within the drive chamber 15. Water entering the water supply channel 14 can sequentially push the force plates 411, thereby causing the rotating drum 41 to rotate. The interiors of the rotating drum 41, the first sleeve 42, and the second sleeve 43 are sequentially connected. A buffer chamber 16 is provided within the base 1. The buffer chamber 16 is connected to the water supply channel 14 and the interior of the rotating drum 41, allowing the water in the water supply channel 14 to drive the rotating drum. After rotation, the water first flows into the buffer chamber 16. Once the buffer chamber 16 is full, the water flows upward sequentially into the rotating cylinder 41, the first sleeve 42, and the second sleeve 43. The diameter of the connecting hole between the rotating cylinder 41, the first sleeve 42, and the second sleeve 43 is small, which allows the water in the buffer chamber 16 to generate water pressure in the rotating cylinder 41 and the second sleeve 43, thereby pushing the first sleeve 42 and the second sleeve 43 to move upward. Multiple drain holes 432 communicating with the outside are provided on the side wall of the second sleeve 43, so that the water in the first sleeve 42 and the second sleeve 43 can be discharged outward through the drain holes after they are full, thereby playing a role in pressure relief. The water discharged from the drain holes 432 is sprayed onto the inner wall of the wiping cloth 5 and the slump cylinder 3, which has the effect of wetting the wiping cloth 5 and cleaning the slump cylinder 3.

[0039] The working principle of the detection device for accurately measuring the slump of concrete in this application is as follows: In the initial state, the telescopic unit 4 is retracted into the base 1; the counterweight plate 431 encloses the wiping cloth 5 in the drying tank 12; the base plate 2 is placed on the base 1; and the slump cylinder 3 is placed on the base plate 2.

[0040] When testing the slump of concrete, the concrete to be tested is placed into the slump cone 3 in three layers, with each layer being approximately the same height. After each layer is filled, it is tamped 25 times with a tamping rod. The tamping should be done in a spiral direction from the outside to the inside, penetrating the entire depth while avoiding impacting the bottom layer. The tamping force should be uniform. After the top layer is tamped, more concrete is added until it is higher than the top opening of the slump cone 3. The excess concrete at the top is scraped off with a tamping rod and smoothed with a trowel until the concrete surface is flush with the top opening of the slump cone 3. The spilled concrete around the slump cone 3 is cleaned up. Then, the slump cone 3 is lifted vertically and steadily upwards. The entire process should be completed within 2-5 seconds. There should be no rotation or lateral movement when lifting the slump cone 3, otherwise it will affect the accuracy of the results. The lifted slump cone 3 is placed upside down and set aside. There should be no residual concrete inside the cone. Then, the height of the concrete after slumping is measured immediately. A ruler is placed vertically on the base plate 2, and the vertical distance from the top surface of the base plate 2 to the highest point of the slump is measured.

[0041] It should be noted that the tamping force, trowel, and ruler are all standard measuring tools and therefore are not shown in the attached drawings.

[0042] After the concrete slump test is completed, the base plate 2 is removed from the base 1, the slump cylinder 3 is placed on the base 1, and the annular wastewater tank 13 is covered inside it; then the water hole switch is turned to open the water hole, and the water pump flushes water into the water supply channel 14. The water first enters the drive chamber 15, impacts the force plate 411 on the rotating cylinder 41, generates rotational torque, and drives the rotating cylinder 41 to start rotating. The water flow then passes through the buffer chamber 16 for pressure stabilization, and then enters the internal water passage connecting the rotating cylinder 41, the first sleeve 42, and the second sleeve 43. Because the internal water passage diameter is small, the water flow builds up pressure within it, causing the water pressure to act on the cross-sections of the first sleeve 42 and the second sleeve 43, generating an upward thrust. This pushes the first sleeve 42 and the second sleeve 43 to overcome the gravity of the counterweight plate 431 and extend upwards in sequence. As the telescopic unit 4 rises and rotates, the wiping cloth 5 installed on the top of the second sleeve 43 and the rotating cylinder 41 is unfolded and pressed tightly against the inner wall of the slump cylinder 3. The water pressure inside the telescopic unit 4 continues to rise, and when it reaches a certain value, the water flows out from the drain hole 432 on the side wall of the second sleeve 43. The sprayed water directly wets the rotating wiping cloth 5 and the inner wall of the cylinder, achieving simultaneous cleaning and wetting.

[0043] Then, the water pump is turned off, and the air pump is started to introduce high-pressure gas into the water supply channel 14. The flow pattern of the high-pressure gas is the same as that of the water, which will not be described in detail here. After the high-pressure gas is introduced, the water in the water supply channel 14, drive chamber 15, buffer chamber 16, rotating drum 41, first sleeve 42 and second sleeve 43 is discharged from the outlet. Then, the air pump is turned off, and the telescopic unit 4 moves downward under the pressure of the counterweight plate 431, and completely seals the wiping cloth 5 in the drying chamber. The air pump is turned on again, and the gas flows first... The drive drum 41 rotates, the drying plate 11 twists the wiping cloth 5, squeezing out the water in the wiping cloth 5 and discharging it into the annular wastewater tank 13; then the power of the air pump is increased, thereby increasing the air pressure. After the air pressure in the buffer chamber 16 increases rapidly, it lifts the first sleeve 42 and the second sleeve 43 upwards. The rotating telescopic unit 4 drives the wiping cloth 5 to wipe the inner wall of the slump cylinder 3, wiping away the water on the slump cylinder 3; after wiping is completed, the air pump is turned off, the telescopic unit 4 is reset, and the cleaning and wiping process of the slump cylinder 3 is completed.

[0044] This solution uses hydraulics as the core driving force, achieving three core actions—rotation, extension, and water supply—in one fell swoop. It also uses a counterweight plate 431 to achieve automatic reset and closed drying, and mechanical twisting to enhance the drying effect. Finally, an air pump is introduced to wipe the slump cylinder 3. The entire process is highly automated, minimizing human intervention and ensuring the standardization and accuracy of the preparation work before the concrete slump test, thereby ensuring the accuracy and reliability of the final measurement results.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A detection device for accurately measuring the slump of concrete, characterized in that: The system includes a base (1), a bottom plate (2), and a slump cylinder (3); the bottom plate (2) is detachably mounted above the base (1); a telescopic unit (4) is rotatably mounted on the base (1); a plurality of wiping cloths (5) are evenly arranged around the periphery of the telescopic unit (4); the plurality of wiping cloths (5) respectively abut against the inner wall of the slump cylinder (3); a water supply unit is mounted on the base (1); the water supply unit wets the plurality of drying cloths; a plurality of drying plates (11) are mounted on the top wall of the base (1); the plurality of drying plates (11) are evenly distributed along the periphery of the telescopic unit (4); after the telescopic unit (4) moves down, the plurality of wiping cloths (5) abut against the surfaces of the plurality of drying plates (11).

2. The device for measuring slump of concrete according to claim 1, wherein: The telescopic unit (4) includes a rotating cylinder (41), a first sleeve (42), and a second sleeve (43); the rotating cylinder (41) is rotatably mounted on the base (1); the first sleeve (42) is slidably mounted inside the rotating cylinder (41); the second sleeve (43) is slidably mounted inside the first sleeve (42); one end of the wiping cloth (5) is mounted on the top of the second sleeve (43), and the other end is mounted on the top of the rotating cylinder (41).

3. The device for measuring slump of concrete according to claim 2, wherein: A drying trough (12) is provided on the top wall of the base (1); a plurality of drying plates (11) are located in the drying trough (12); a plurality of drainage troughs (121) communicating with the outside are provided on the side wall of the drying trough (12).

4. The device for measuring slump of concrete according to claim 3, wherein: The base (1) has an annular wastewater trough (13) on its top wall; the annular wastewater trough (13) has multiple drain holes (131) on its bottom wall; the drain trough (121) is connected to the annular wastewater trough (13).

5. The device for measuring slump of concrete according to claim 3, wherein: The top wall of the second sleeve (43) is provided with a counterweight plate (431); after the second sleeve (43) slides down, the counterweight plate (431) is used to seal the drying tank (12).

6. The device for measuring slump of concrete according to claim 3, wherein: The base (1) has a water supply channel (14) and a drive cavity (15) that are interconnected. The water supply unit includes a water pump and multiple force plates (411). The water pump and the water supply channel (14) are connected. Multiple force plates (411) are evenly arranged on the side wall of the rotating drum (41) in the circumferential direction. Multiple force plates (411) are all located in the drive cavity (15). After the rotating drum (41) rotates, any one of the force plates (411) is located in the drive cavity (15).

7. The device for measuring slump of concrete according to claim 6, wherein: The interiors of the rotating drum (41), the first sleeve (42), and the second sleeve (43) are connected in sequence; a buffer cavity (16) is provided on the base (1); the buffer cavity (16) is connected to the interior of the water supply channel (14) and the rotating drum (41).

8. The detection device for accurately measuring the slump of concrete according to claim 6, characterized in that: The second sleeve (43) has multiple drainage holes (432) on its side wall that communicate with the outside.

9. The detection device for accurately measuring the slump of concrete according to claim 8, characterized in that: An air pump is provided on the base (1); both the air pump and the water pump are connected to the water supply channel (14).

10. The detection device for accurately measuring the slump of concrete according to claim 9, characterized in that: Both the air pump and the water pump are equipped with one-way valves at their output ends.

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