Automatic concrete slump measuring device and method

Abstract

The invention discloses an automatic concrete slump measuring device and method, and relates to the technical field of slump measurement, the automatic concrete slump measuring device comprises a slump cylinder, a vibration mechanism, a lifting mechanism and a measuring unit, the vibration mechanism comprises a base bottom plate, a driving unit and a plurality of adjusting supporting legs used for supporting the base bottom plate, the slump cylinder is placed on the base bottom plate, and the driving unit is arranged on the base bottom plate; the driving unit is used for vibrating the base bottom plate and is mounted on the base bottom plate; the lifting mechanism comprises two lifting rods used for lifting the slump cylinder and a movable cross rod used for being connected with the slump cylinder, the lower ends of the lifting rods are in threaded connection with the base bottom plate, the base bottom plate is provided with a transmission assembly, the bottom ends of the lifting rods are in linkage with the driving unit through the transmission assembly, and the upper ends of the lifting rods are connected with the movable cross rod; a lifting handle is arranged on a cylinder body of the slump cylinder and is connected with the movable cross rod; the measuring unit is fixed to the lifting rod, and the detection end of the measuring unit faces the base bottom plate. The concrete slump measuring device has the effect of improving the concrete slump measuring accuracy.

Description

Technical Field

[0001] The present application relates to the technical field of slump measurement, and in particular to a device and method for automatically measuring the slump of concrete. Background Art

[0002] During construction, quality assurance measures require concrete testing, including extensive slump measurement. Traditional concrete slump measurement methods require mixing the concrete until evenly mixed, then placing it into a slump cone and tamping it evenly with a tamping rod to remove air bubbles. Once the concrete is ready, the cone is lifted vertically upward, and the slump is manually measured with a ruler.

[0003] This method relies entirely on manual testing, which is laborious when performing large-scale testing. If the collapse cone is not lifted vertically or the tamping rod is not inserted evenly, the measurement data may have large errors. Therefore, this application proposes a new technical solution. Summary of the Invention

[0004] In order to improve the accuracy of concrete slump measurement, the present application provides a concrete slump automatic measurement device and method.

[0005] The present application provides a concrete slump automatic measuring device, which adopts the following technical solution:

[0006] A concrete slump automatic measuring device includes a slump cone, a vibration mechanism, a lifting mechanism, and a measuring unit. The vibration mechanism includes a base plate, a drive unit, and a plurality of adjustment legs for supporting the base plate. The plurality of adjustment legs are respectively distributed at multiple corners of the base plate and are threadedly connected to the base plate. The slump cone is placed on the base plate. The drive unit is used to vibrate the base plate and is installed on the base plate.

[0007] The lifting mechanism includes two lifting rods for lifting the collapse cone and a movable cross bar for connecting the collapse cone. The lower ends of the lifting rods are threadedly connected to the base bottom plate. The base bottom plate is provided with a transmission assembly. The bottom ends of the lifting rods are linked to the drive unit through the transmission assembly. The upper ends of the lifting rods are connected to the movable cross bar. The body of the collapse cone is provided with a lifting handle, and the lifting handle is connected to the movable cross bar. The measuring unit is fixed to the lifting rod, and the detection end of the measuring unit faces the base bottom plate.

[0008] Optionally, the lifting rod includes a sleeve and a lifting rod, the sleeve is sleeved on the lifting rod and the lifting rod is vertically slidably connected to the sleeve, the lower end of the sleeve is threadedly connected to the bottom plate of the base, the upper end of the lifting rod extends out of the sleeve and is connected to the movable cross bar, and the movable cross bar is provided with a clamping block at one end facing the collapse cylinder, which is clamped in a preset clamping groove of the lifting handle, and the transmission assembly is used to drive the lifting rod to rise and fall.

[0009] Optionally, the drive unit is vertically arranged, and the output shaft of the drive unit is located at the midpoint of the base bottom plate, and the output shaft of the drive unit is fixed with a horizontally arranged eccentric wheel, and the side wall of the eccentric wheel is in contact with the base bottom plate; the output shaft of the drive unit is also fixed with at least two horizontally arranged multi-groove wheels, and the two lifting rods are threadedly connected with nuts, and the outer side of the nut is provided with a rotating wheel, and the grooves of the multi-groove wheels are respectively provided with a belt together with the preset embedding grooves of the two rotating wheels, and the two groove walls of the embedding groove of the rotating wheel and the groove of the multi-groove wheel are bent toward opposite sides to form a limit for the belt.

[0010] Optionally, the base bottom plate includes a base plate and a movable plate, the middle part of the base plate is hollow and is used for the movable plate to slide in and out, the base plate is threadedly connected to the adjustment leg, the movable plate is slidably connected to the base plate, and the two ends of the movable plate are bent upward to form a seal for leaking cement. Several support platforms supporting the movable plate are provided inside the base plate, and the upper surface of the support platform abuts against the movable plate.

[0011] Optionally, the adjustment foot is a two-layer structure of inner and outer layers, and the adjustment foot includes an abutment support and a buffer part movably connected to the abutment support, the abutment support is hollow inside and open at the top, the abutment support is sleeved on the buffer part and a plurality of springs are provided in the abutment support, and the buffer part is fixed to the spring; the side wall of the abutment support is provided with a rubber skin, the rubber skin is provided with a water hole and a corresponding sealing part, and the side wall of the abutment support is provided with a water outlet hole connected to the inside of the rubber skin and a corresponding sealing part.

[0012] Optionally, a clamp is clamped on the outer side of the sleeve and the clamp is rotatably connected to the sleeve, the clamp is integrally formed with a connecting cross bar, the measuring unit is fixed to the end of the connecting cross bar away from the sleeve, and when the connecting cross bar rotates toward the top of the movable plate, the measuring unit is located above the center of the movable plate.

[0013] Optionally, the measuring unit includes a laser ranging sensor, and the laser ranging sensor is electrically connected to a controller and a display, the controller and the display are electrically connected, and the controller is configured as follows:

[0014] Get the data information fed back when the base plate is located below the laser ranging sensor and define it as H;

[0015] Obtain the data information fed back by the laser ranging sensor after the collapse cone is filled with concrete and define it as h3;

[0016] Obtain the data information of the slump body fed back by the laser ranging sensor after the slump cone is lifted, and define it as h4;

[0017] Calculate the height h1 of the slump cone, where h1 = H - h3;

[0018] Calculate the height h2 of the concrete slump after the slump cone is lifted, where h2 = H-h4;

[0019] Calculate the slump S, where S = (h1 - h2) / h1 * 100%.

[0020] Optionally, the clamping groove provided on the lifting handle is a wedge-shaped structure, the clamping block is a wedge-shaped structure that fits in the clamping groove, and the end of the lifting cross bar is embedded in the clamping groove.

[0021] A method for automatically measuring concrete slump comprises the following steps:

[0022] S1. Preparation work, which includes:

[0023] Level the base;

[0024] Install the slump cone and connect the movable crossbar to the lifting handle;

[0025] Initialize measurement data;

[0026] S2. Filling and vibrating concrete, which includes:

[0027] Fill with concrete;

[0028] Turn on the vibration mechanism to vibrate;

[0029] S3. Lift the slump cone and measure data, which includes:

[0030] Turn on the driving mechanism to drive the lifting rod to rise at a constant speed;

[0031] After leaving the slump cone, move the laser ranging sensor to the center of the base plate and measure the data;

[0032] S4. Post-test processing, which includes:

[0033] Calculate the slump test value and determine whether the slump test value exceeds a preset range;

[0034] Clean the device.

[0035] To sum up, the present application includes the following beneficial technical effects: by leveling multiple threaded adjustment feet, the base plate is kept horizontal, and the concrete collapse direction deviation and data error caused by the tilt of the base plate are eliminated as much as possible. The movable cross bar is connected to the lifting handle, and the driving unit is combined to keep the lifting rod at a uniform speed and lift vertically as much as possible, effectively avoiding the deformation of the concrete collapse body caused by manual lifting and shaking, thereby further improving the accuracy of the concrete measurement data. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is an exploded schematic diagram of the overall structure of this application;

[0037] Figure 2 is a cross-sectional view of the clamping block in this application;

[0038] Figure 3 is a cross-sectional view of the transmission mechanism in this application;

[0039] Figure 4 is a cross-sectional view of the multi-groove wheel and the runner in this application;

[0040] Figure 5 is an exploded view of the adjustment foot in this application;

[0041] Figure 6 is a flow chart of the method in this application.

[0042] Explanation of the accompanying drawings: 1. Base bottom plate; 11. Movable plate; 12. Base plate; 13. Support platform; 2. Adjustment foot; 21. Abutment support; 22. Buffer; 23. Spring; 24. Rubber skin; 3. Drive unit; 4. Collapse cylinder; 41. Lifting handle; 5. Lifting mechanism; 51. Lifting rod; 52. Movable cross bar; 511. Sleeve; 512. Lifting rod; 513. Clamp; 514. Connecting cross bar; 6. Transmission assembly; 61. Multi-groove pulley; 62. Rotating wheel; 63. Belt. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-6 This application is described in further detail.

[0044] The embodiments of the present application disclose an automatic measurement device and method for concrete slump.

[0045] Reference Figure 1The automatic concrete slump measuring device and method include a slump cone 4, a vibration mechanism, a lifting mechanism 5, and a measuring unit. The vibration mechanism includes a base plate 1, a drive unit 3, and a plurality of adjustment legs 2 for supporting the base plate 1. The base plate 1 can be rectangular when viewed from above. The adjustment legs 2 include at least three and are evenly distributed. This article uses four adjustment legs 2 as an example for explanation. The four adjustment legs 2 can be located at the four corners of the rectangle, and the adjustment legs 2 are threadedly connected to the base plate 1 and are used to adjust the base plate 1 to a horizontal position. For example, adjustment is performed by rotating the adjustment legs 2. To facilitate rotation, a knob for twisting can be provided on the outside of the adjustment legs. The slump cone 4 is placed on the base plate 1 and is located at the center of the base plate 1. The drive unit 3 is used to vibrate the base plate 1, causing it to shake, thereby evenly vibrating the cement in the slump cone 4. A bracket for installing the drive unit 3 is provided at the bottom of the base plate 1. The drive unit 3 is installed in the bracket by bolts and nuts.

[0046] The lifting mechanism 5 includes two lifting rods 51 for lifting the slump cone 4 and a movable crossbar 52 for connecting the slump cone 4. The lower ends of the lifting rods 51 are threadedly connected to the base bottom plate 1. The base bottom plate 1 is provided with a transmission assembly 6. The base bottom plate 1 may be provided with a mounting groove. The transmission assembly 6 is installed in the mounting groove inside the base bottom plate 1. The bottom ends of the lifting rods 51 are linked to the drive unit 3 through the transmission assembly 6, so that the drive unit 3 can drive the lifting rods 51 to move up and down. The upper ends of the lifting rods 51 are connected to the movable crossbar 52. The barrel of the slump cone 4 is provided with a lifting handle 41 connected to the movable crossbar 52.

[0047] In order to ensure that after the two are connected, when the driving unit 3 vibrates the base bottom plate 1, the collapse cylinder 4 will not change position due to vibration, so the present application includes another embodiment:

[0048] Reference Figure 2 The lifting handle 41 is provided with a wedge-shaped clamping groove, which is short at the top and wide at the bottom, that is, the cross-sectional area of ​​the groove is larger than the bottom of the groove, and the end of the movable cross bar 52 is integrally formed with a clamping block that fits the clamping groove. The clamping block is a wedge-shaped block structure, and the end of the movable cross bar 52 is in contact with the clamping groove. Through the above design, due to the large area of ​​the groove, it is more convenient to insert the clamping block into the clamping groove, and the inclined surfaces of the two will gradually make the side wall of the clamping block abut against the clamping groove, reducing the gap and jitter at the connection between the two.

[0049] Reference Figure 1The measuring unit is fixed to the lifting rod 51, and the detection end of the measuring unit is set toward the bottom plate of the base 1. The measuring unit of the present application can be a laser ranging sensor, which is set downward to measure the distance from the installation position of the laser ranging sensor to the bottom, so that the results can be estimated and analyzed after multiple measurements (such as measuring the distance to the collapse cone 4 once after the installation is completed and the cement is filled and leveled, and measuring the distance to the cement body again after the collapse cone 4 is lifted).

[0050] Through the above-mentioned settings, the data error caused by the inclination of the base bottom plate 1 is avoided as much as possible by leveling the base bottom plate 1, and the deviation of the concrete collapse direction toward the inclination direction is avoided as much as possible, thereby ensuring that the formed concrete collapse body does not deform as much as possible; the collapse cone 4 is lifted by the lifting mechanism 5, and it is ensured that the collapse cone 4 remains in a vertical state as much as possible when lifted, and the impact on the collapse body after the collapse cone 4 is lifted is avoided as much as possible; the base bottom plate 1 is vibrated at a high frequency by the vibration mechanism, so that the concrete in the collapse cone 4 can be easily free of bubbles, thereby further improving the accuracy of the data obtained by the concrete slump measurement.

[0051] Reference Figure 1 The lifting rod 51 includes a sleeve 511 and a lifting rod 512. The sleeve 511 is sleeved on the lifting rod 512 and the lifting rod 512 is vertically slidably connected to the sleeve 511. The interior of the sleeve 511 is hollow and the lower end is threadedly connected to the base bottom plate 1. The upper end of the lifting rod 512 extends out of the sleeve 511 and is connected to the movable cross bar 52. The clamping block extending from one end of the movable cross bar 52 toward the collapse cylinder 4 is clamped in the clamping groove of the lifting handle 41, and the transmission assembly 6 is used to drive the lifting rod 512 to rise and fall.

[0052] Reference Figure 1 The drive unit 3 is vertically arranged. The drive unit 3 can be a servo motor. The output shaft of the servo motor extends vertically toward the base bottom plate 1 and is located at the midpoint of the base bottom plate 1. The output shaft of the servo motor is fixed with a horizontally arranged eccentric wheel. The servo motor drives the eccentric wheel to rotate. At the same time, the upper surface of the eccentric wheel is at the base bottom plate 1. Under the eccentric action, when the servo motor rotates, the center of gravity of the base bottom plate 1 will change, thereby causing vibration.

[0053] Refer to Figures 3 and Figure 4 The output shaft of the servo motor is also fixed with at least two horizontally arranged multi-groove pulleys 61, and the two multi-groove pulleys 61 are symmetrically arranged one on the left and the other on the right. Among them, the bottom of the two lifting rods 512 is threadedly connected with a nut, and the outer side of the nut is sleeved with a rotating wheel 62. The rotating wheel 62 and the multi-groove pulley 61 are both located inside the base bottom plate 1, and the multi-groove pulley 61 and the two different rotating wheels 62 on both sides are all sleeved with the same belt 63, and the belt 63 is embedded in the groove of the multi-groove pulley 61 and the preset embedding groove of the rotating wheel 62.

[0054] Due to the above arrangement, the base plate 1 vibrates, so the groove walls of the multi-groove wheel 61 and the groove walls of the embedded groove of the rotating wheel 62 are bent toward opposite sides and limit the belt 63 to prevent the belt 63 from slipping.

[0055] Reference Figure 1 , because the concrete is in cement state during testing, it is easy to overflow. After solidification, it may cause the gap between the adjustment foot 2 and the base plate 1 to be blocked and solidified, affecting the use of the device. Therefore, the following design is made:

[0056] The base plate 1 comprises a base plate 12 and a movable plate 11. The base plate 12 has a hollow center and is used for sliding the movable plate 11 in and out. The base plate 12 may be provided with a slide groove, and the movable plate 11 may be provided with a slider corresponding to the slide groove. The two slide together to facilitate replacement and cleaning of the movable plate 11. The base plate 12 is threadedly connected to adjustment legs 2, which are mounted at the four corners of the base plate 12, i.e., located on the sides of the base plate 12 cavity and connected only to the base plate 12. The movable plate 11 is slidably connected to the base plate 12. The ends of the movable plate 11 are bent upward to block cement spills. Several support platforms 13 are provided within the base plate 12 to support the movable plate 11. There is at least one support platform 13. If there is only one support platform 13, it must be mounted at the center of the base plate 12. If there are multiple support platforms 13, they should be evenly distributed along the circumference of the base plate 12, with the top surface of the support platform 13 abutting the movable plate 11. The provision of the support platform 13 effectively prevents the movable panel 11 from being deformed due to long-term vibration.

[0057] Reference Figure 1 and Figure 5 Since the device may also vibrate or even move after the driving unit 3 starts to drive the vibration, the following design is made: the adjustment foot 2 is a two-layer structure of inner and outer layers, and the adjustment foot 2 includes a contact support 21 and a buffer member 22 movably connected to the contact support 21, wherein the lower end of the contact support 21 contacts the ground. Since the ground may be uneven or tilted, the bottom end of the adjustment foot 2 can be set to a spherical shape, and the material can be rubber, so that it is more convenient for the adjustment foot 2 to contact the ground.

[0058] The abutment support 21 is hollow inside and open at the top. The abutment support 21 is sleeved on the buffer 22, and a plurality of springs 23 are arranged in the abutment support 21, wherein the buffer 22 can be a plate-like structure with a circular bottom when viewed from above, and is fixed to the spring 23. The upper end of the buffer 22 is columnar and the top is set to a threaded structure and connected to the base plate 12, so that when the driving unit 3 vibrates, it only drives the base plate 12, the movable plate 11 and the buffer 22 to vibrate and swing, and does not affect the abutment support 21 against the ground, thereby effectively alleviating the displacement caused by vibration.

[0059] The inner side wall of the abutment support 21 is provided with a rubber skin 24. The inside of the rubber skin 24 is hollow and is used to fill water to resist and cushion the buffer 22 when it swings to the side wall. Therefore, when the buffer 22 swings to the side wall, it will be compressed to cause the rubber skin 24 to deform, thereby ensuring that the buffer 22 can swing 360 degrees.

[0060] Reference Figure 1 The outside of the sleeve 511 is clamped with a clamp 513 and the clamp 513 is rotatably connected to the sleeve 511. The clamp 513 is integrally formed with a connecting cross bar 514. The connecting cross bar 514 extends toward the top of the movable plate 11, and the measuring unit is fixed to the end of the connecting cross bar 514 away from the sleeve 511. When the connecting cross bar 514 fluctuates toward the movable plate 11, the measuring unit can be located above the center of the movable plate 11, that is, above the collapse cone 4, so as to facilitate the measurement of the height of the collapse cone 4 or even the collapse body after the collapse cone 4 is lifted.

[0061] The measuring unit includes a laser ranging sensor, and the laser ranging sensor is electrically connected to a controller and a display. The controller and the display are electrically connected. Through the cooperation of the display and the controller, it is more convenient to record data, observe data, and compare data. The controller is configured as follows:

[0062] The data information fed back when the base bottom plate 1 is below the laser distance measuring sensor is obtained and defined as H; this step is to obtain the height of the laser distance measuring sensor, which is reset and redefined each time it is clamped in the sleeve 511. Since the clamp 513 is clamped in the sleeve 511, the height of the laser distance measuring sensor does not change when the lifting rod 51 is lifted. Therefore, it is only necessary to pull back the connecting cross bar 514 of the clamp 513 so that the end of the cross bar is located above the collapse cone 4 or the collapse body for measurement. It is worth noting that the clamping position of the clamp 513 is at least higher than the height of the collapse cone 4.

[0063] The controller obtains the data information fed back by the laser ranging sensor after the collapse cone 4 is filled with concrete, and defines it as h3; among them, by obtaining h3, it can be known that the distance between the laser ranging sensor and the top of the collapse cone 4 is measured after the collapse cone 4 is filled with concrete. Because the wall thickness of the collapse cone 4 is too thin, the laser ranging sensor may not be able to detect it. Therefore, the collapse cone 4 is filled with concrete first, and the top is scraped flat before measurement, which can make the measured data more accurate.

[0064] The controller obtains the data information of the slump body fed back by the laser ranging sensor after the slump cone 4 is lifted, and defines it as h4; among them, by obtaining h3, it can be known that the distance between the laser ranging sensor and the top of the slump body, and the slump body here refers to the measurement of the height of the slump body after the slump cone 4 is lifted for a certain period of time (such as 5 to 10 seconds).

[0065] The controller calculates the height h1 of the slump cone 4, where h1 = H - h3; for example, if H is 50 cm and h3 is 20 cm, the height of the slump cone 4 should be 30 cm.

[0066] The controller calculates the height h2 of the concrete slump after the slump cone 4 is lifted, where h2=H-h4; the example is the same as above, H is 50 cm, h4 is 30 cm, and the height of the slump is 20 cm.

[0067] The controller calculates the slump S, where S = (h1-h2) / h1*100%, for example: (30-20) / 30*100%, then the slump is approximately 33.3%.

[0068] Through the above arrangement, even if the specifications of the slump cone 4 are different each time, the height of the slump cone 4 can be reset by calculation, and the slump can be further calculated by the height of the slump cone 4 and the height of the slump body.

[0069] The embodiment of the present application also discloses a method for automatically measuring the slump of concrete.

[0070] Reference Figure 6 , the automatic measurement method of concrete slump includes the following steps:

[0071] S1. Preparation work, which includes:

[0072] (1) Level the base; adjust the base to a horizontal level by rotating the four adjustment feet 2. During this time, you can use a level or other instrument to check whether it is level.

[0073] (2) Install the slump cone 4 and place it vertically at the center of the base bottom plate 1, with no gap between the cone bottom and the base contact surface; connect the movable cross bar 52 to the lifting handle 41, and insert the clamping block of the movable cross bar 52 into the clamping groove to connect the two;

[0074] (3) Initializing the measurement data; manually rotating the fixture 513, moving the laser ranging sensor to the top of the center of the base plate 1, recording and calibrating the sensor height to obtain H;

[0075] S2. Filling and vibrating concrete, which includes:

[0076] (1) Filling with concrete; filling the slump cone 4 in three layers, where the height of each layer can be 1 / 3 of the cone height. After filling, rotate the laser ranging sensor to the top of the slump cone 4 to measure and obtain h3;

[0077] (2) Turn on the vibration mechanism to vibrate; after the vibration is completed, let it stand for 5 seconds until the concrete surface stabilizes.

[0078] S3, lifting the slump cone 4 and measuring data, which includes:

[0079] (1) Turn on the driving unit 3 to drive the lifting rod 512 to rise at a constant speed; the driving unit 3 drives the lifting rod 512 to rise at a constant speed through the multi-groove pulley 61 and the belt 63 to ensure that the collapse cylinder 4 is vertically separated from the concrete (without tilting or shaking). This process is completed within at least 5 to 10 seconds.

[0080] (2) After the slump cone 4 is separated and completely separated, the slump body is left to stand for 5 to 10 seconds until the natural collapse is stable, and the laser ranging sensor is moved to the center of the base bottom plate 1 and the data is measured;

[0081] S4. Post-test processing, which includes:

[0082] (1) Calculate the slump detection value (such as the controller calculation process mentioned above) and determine whether the slump detection value exceeds the preset range;

[0083] (2) Cleaning the equipment; dismantling the collapse cylinder 4, flushing the residual concrete on the inner wall, removing the movable plate 11 and flushing it, resetting the lifting rod 51 to the initial position, and rotating the clamp 513 to reset the laser ranging sensor.

[0084] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A concrete slump automatic measuring device, comprising a slump cone (4), characterized in that: It also includes a vibration mechanism, a lifting mechanism (5) and a measuring unit, wherein the vibration mechanism includes a base bottom plate (1), a driving unit (3) and a plurality of adjustment legs (2) for supporting the base bottom plate (1), wherein the plurality of adjustment legs (2) are respectively distributed at a plurality of corners of the base bottom plate (1) and are threadedly connected to the base bottom plate (1), the collapse cylinder (4) is placed on the base bottom plate (1), and the driving unit (3) is used to vibrate the base bottom plate (1) and is installed on the base bottom plate (1); The lifting mechanism (5) comprises two lifting rods (51) for lifting the slump cone (4) and a movable crossbar (52) for connecting the slump cone (4); the lower ends of the lifting rods (51) are threadedly connected to the base bottom plate (1); the base bottom plate (1) is provided with a transmission assembly (6); the lower ends of the lifting rods (51) are linked to the drive unit (3) through the transmission assembly (6); the upper ends of the lifting rods (51) are connected to the movable crossbar (52); the body of the slump cone (4) is provided with a lifting handle (41), and the lifting handle (41) is connected to the movable crossbar (52); the measuring unit is fixed to the lifting rod (51), and the detection end of the measuring unit faces the base bottom plate (1).

2. The automatic concrete slump measuring device according to claim 1, characterized in that: The lifting rod (51) comprises a sleeve (511) and a lifting rod (512), wherein the sleeve (511) is sleeved on the lifting rod (512) and the lifting rod (512) is vertically slidably connected to the sleeve (511), the lower end of the sleeve (511) is threadedly connected to the base bottom plate (1), the upper end of the lifting rod (512) extends out of the sleeve (511) and is connected to the movable cross bar (52), and the movable cross bar (52) is provided with a clamping block that is clamped in a preset clamping groove of the lifting handle (41) at one end facing the collapse cylinder (4), and the transmission assembly (6) is used to drive the lifting rod (512) to move up and down.

3. The automatic concrete slump measuring device according to claim 2, characterized in that: The drive unit (3) is vertically arranged, and the output shaft of the drive unit (3) is located at the midpoint of the base bottom plate (1), and the output shaft of the drive unit (3) is fixed with an eccentric wheel arranged horizontally, and the side wall of the eccentric wheel is in contact with the base bottom plate (1); the output shaft of the drive unit (3) is also fixed with at least two multi-grooved wheels (61) arranged horizontally, and the two lifting rods (512) are threadedly connected with nuts, and the outer side of the nut is provided with a rotating wheel (62), and the groove of the multi-grooved wheel (61) and the preset embedding grooves of the two rotating wheels (62) are respectively provided with a belt (63), and the two groove walls of the embedding groove of the rotating wheel (62) and the groove of the multi-grooved wheel (61) are bent toward opposite sides to form a limit for the belt (63).

4. The automatic concrete slump measuring device according to claim 3, characterized in that: The base bottom plate (1) includes a base plate (12) and a movable plate (11). The middle part of the base plate (12) is hollow and is used for the movable plate (11) to slide in and out. The base plate (12) is threadedly connected to the adjustment leg (2). The movable plate (11) is slidably connected to the base plate (12). The two ends of the movable plate (11) are bent upward to form a seal for cement leakage. A plurality of support platforms (13) supporting the movable plate (11) are provided inside the base plate (12). The upper surface of the support platform (13) abuts against the movable plate (11).

5. The automatic concrete slump measuring device according to claim 4, characterized in that: The adjusting foot (2) is a two-layer structure, comprising an abutting support (21) and a buffer member (22) movably connected to the abutting support (21); the abutting support (21) is hollow inside and open at the top; the abutting support (21) is sleeved on the buffer member (22); a plurality of springs (23) are provided in the abutting support (21); the buffer member (22) is fixed to the spring (23); a rubber skin (24) is provided on the side wall of the abutting support (21); the rubber skin (24) is provided with a water hole and a corresponding blocking member; the side wall of the abutting support (21) is provided with a water outlet hole connected to the inside of the rubber skin (24) and a corresponding blocking member.

6. The automatic concrete slump measuring device according to claim 5, characterized in that: The outer side of the sleeve (511) is clamped with a clamp (513), and the clamp (513) is rotatably connected to the sleeve (511). The clamp (513) is integrally formed with a connecting cross bar (514). The measuring unit is fixed to the end of the connecting cross bar (514) facing away from the sleeve (511). When the connecting cross bar (514) rotates toward the top of the movable plate (11), the measuring unit is located above the center of the movable plate (11).

7. The automatic concrete slump measuring device according to claim 6, characterized in that: The measuring unit includes a laser ranging sensor, and the laser ranging sensor is electrically connected to a controller and a display. The controller and the display are electrically connected, and the controller is configured as follows: Obtaining data information fed back when the base plate (1) is located below the laser ranging sensor, and defining it as H; Obtain data information fed back by the laser ranging sensor after the collapse cone (4) is filled with concrete, and define it as h3; Obtain data information of the slump body fed back by the laser ranging sensor after the slump cone (4) is lifted, and define it as h4; Calculate the height h1 of the slump cone (4), where h1 = H - h3; Calculate the height h2 of the concrete slump after the slump cone (4) is lifted, where h2 = H - h4; Calculate the slump S, where S = (h1 - h2) / h1 * 100%.

8. The automatic concrete slump measuring device according to claim 7, characterized in that: The clamping groove provided on the lifting handle (41) is a wedge-shaped structure, the clamping block is a wedge-shaped structure that fits in the clamping groove, and the end of the lifting cross bar is embedded in the clamping groove.

9. A method for automatically measuring concrete slump, characterized in that: The automatic measuring device for concrete slump cone according to any one of claims 1 to 8 comprises the following steps: S1. Preparation work, which includes: Level the base; Install the slump cone (4) and connect the movable crossbar (52) to the lifting handle (41); Initialize measurement data; S2. Filling and vibrating concrete, which includes: Fill with concrete; Turn on the vibration mechanism to vibrate; S3, lifting the slump cone (4) and measuring data, which includes: The driving mechanism is turned on to drive the lifting rod (512) to rise at a constant speed; After leaving the slump cone (4), the laser distance measuring sensor is moved to the top of the center of the base bottom plate (1) and the data is measured; S4. Post-test processing, which includes: Calculate the slump test value and determine whether the slump test value exceeds a preset range; Clean the device.

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