Rapid detection device and detection method for pumping performance of concrete

Abstract

The invention provides a concrete pumping performance rapid detection device and method, the concrete pumping performance rapid detection device comprises a tamping rod, a measuring bowl, a support and a timing device, the tamping rod with scales is suspended above the measuring bowl on one side of the support through a magnetic suction device, an output shaft of a first motor coaxially arranged with the measuring bowl is connected with one side of the magnetic suction device, and the tamping rod is driven to rotate around the central axis of the measuring bowl; a lifting mechanism is arranged on the support and drives the magnetic attraction device to vertically ascend and descend along the support, the second motor is connected with one side of the magnetic attraction device and drives the magnetic attraction device to rotate to the other side of the support and comprises a cleaning station of a spraying device and an air drying device, and a timing device for recording the time when the tamping bar penetrates into concrete is fixed to the side of the support. The detection method comprises the steps of sample loading treatment, testing device positioning, penetration testing, parallel experiment and data processing. The problems that concrete pumping performance testing precision has errors, measurable concrete types have limitations, and testing results have no quantitative indexes are solved.

Description

Technical Field

[0001] The present invention relates to the field of building concrete construction, and particularly to a device and method for rapidly detecting the pumping performance of concrete. Background Art

[0002] Before concrete pumping construction, it is necessary to detect the consistency performance of concrete. The most common method is the slump test method. The slump and spread values measured are used to judge the quality of the workability of concrete for pumping, so as to determine whether the concrete can be used for pumping construction.

[0003] However, there are some defects and deficiencies in the current slump test method. For example, in terms of test accuracy, the operation skills of testers, test environment, equipment accuracy, etc. may lead to certain errors in test results; when the concrete slump is at the critical value, the error will be more obvious; the applicable range is limited. The traditional slump test method is mainly applicable to evaluating the consistency performance of ordinary concrete. For some special types of concrete, such as high-performance concrete, self-compacting concrete, etc., the relationship between slump and fluidity may not be fully applicable; additional properties in the traditional slump test method, such as stickiness, cohesiveness, and water retention, are all visually observed and sensory evaluated by the operator, and there are no quantitative indicators.

[0004] To overcome these deficiencies and make an effective supplement to the traditional slump method, it can be considered to add a test method and technology to evaluate the performance index of the softness of concrete paste. For example, a concrete penetration depth device can be used to measure the consistency and paste performance of concrete in real time, use the penetration depth to characterize the consistency, and observe the rolling situation of gravel in the paste to determine whether the concrete has pumpability or self-compactability, etc. Summary of the Invention

[0005] The main purpose of the present invention is to provide a device and method for rapidly detecting the pumping performance of concrete, and solve the problems of errors in the test accuracy of concrete pumping performance, limitations in the types of measurable concrete, and no quantitative indicators for test results.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a device for rapidly detecting the pumping performance of concrete, including a rammer, a measuring bowl, a bracket, and a timing device. The graduated rammer is suspended above the measuring bowl on one side of the bracket through a magnetic attraction device, and the output shaft of a first motor coaxially arranged with the measuring bowl is connected to one side of the magnetic attraction device for driving the rammer to rotate around the central axis of the measuring bowl. A lifting mechanism is provided on the bracket to drive the magnetic attraction device to vertically lift along the bracket. A second motor is connected to one side of the magnetic attraction device to drive the magnetic attraction device to rotate to the cleaning station on the other side of the bracket. The cleaning station includes a spraying device and a drying device. A timing device is fixed on the side of the bracket for recording the time when the rammer penetrates into the concrete.

[0007] In a preferred embodiment, two coaxially spaced electromagnetic rings are connected by an eccentric rotating shaft on one side to form a magnetic attraction device. A vertical connecting rod is provided on one side of the bracket, and its end is located on the central axis of the measuring bowl and is fixed with a first motor. The output shaft of the first motor passes through the connecting rod and is connected to the eccentric rotating shaft to drive the magnetic attraction device to rotate around the central axis of the measuring bowl; The distance from the central axis of the eccentric rotating shaft to the central axis of the electromagnetic ring is less than the radius of the measuring bowl.

[0008] In a preferred embodiment, when the two electromagnetic rings are energized, they generate magnetic fields with the same polarity and the same direction, forming an axially superimposed magnetic field; Two magnetic adsorption points with magnetic polarities opposite to those of the electromagnetic rings are provided in the middle of the rammer. The axial distance between the two magnetic adsorption points is equal to the axial distance between the two electromagnetic rings; The rammer is coaxially arranged in the middle of the magnetic field formed by the two electromagnetic rings and is axially positioned by magnetic repulsion.

[0009] In a preferred embodiment, the structure of the lifting mechanism is as follows: a vertical guide rail and a vertical lead screw are arranged in parallel on one side of the bracket through bearing limit seats at both ends. A vertical slider is threadedly connected to the vertical lead screw through a lead screw nut portion in the middle thereof and is slidably connected to the vertical guide rail on one side, forming a linear guide mechanism with double constraints. The lifting motor passes through the bearing limit seat and is connected to one end of the vertical lead screw to drive the vertical slider to lift vertically.

[0010] In a preferred embodiment, the second motor is fixed on the vertical slider, and its output shaft passes through the vertical slider and is connected to one end of the connecting rod. The other end of the connecting rod is connected to the magnetic attraction device, and the second motor drives the magnetic attraction device to rotate around its output shaft.

[0011] In a preferred embodiment, a U-shaped bending structure is provided in the middle of the connecting rod, and its opening direction is perpendicular to the bracket, so that when the magnetic attraction device rotates to the cleaning station on the other side of the bracket on the horizontal plane, the connecting rod does not interfere with the bracket.

[0012] In a preferred embodiment, the spraying device includes a spraying ring, a water pump and a plurality of spray heads evenly arranged circumferentially. The water pump is connected to the plurality of spray heads through the spraying ring, and the outlet direction of the spray heads is obliquely downward and points to the area below the central axis of the spraying ring; The air drying device includes a distribution ring, an air pump and a plurality of air nozzles evenly arranged circumferentially. The air pump is connected to the plurality of air nozzles through the distribution ring, and the outlet direction of the air nozzles is obliquely upward and points to a distance above the central axis of the distribution ring; The spraying device and the air drying device are coaxially arranged on the other side of the bracket through a first support arm and a second support arm respectively, and the spraying device is located at a certain distance directly above the air drying device.

[0013] In a preferred embodiment, a photoelectric sensor is provided at the height of the upper end surface of the measuring bowl on one side of the bracket, and its emitting end faces the upper end surface of the measuring bowl, and is used to monitor the moment when the rammer falls to trigger the timing device; An acceleration sensor is provided at the upper end of the tamping rod to detect the moment when the tamping rod stops penetrating; The device also includes a control center, a timing device, a photoelectric sensor, and an acceleration sensor are communicatively connected to the control center, and a magnetic suction device, a spray device, an air drying device, a lifting mechanism, a first motor, and a second motor are electrically connected to the control center.

[0014] In a preferred embodiment, a method for detecting a rapid detection device for concrete pumping performance comprises: S1. Sample loading and processing: ordinary fluid concrete mixture is loaded into the measuring bowl in three layers, each layer is evenly rammed and vibrated until there are no bubbles on the surface. Self-compacting concrete is filled in one time without vibration and ramming. Scrape off the excess concrete on the surface, smooth it with a spatula, and let it stand for three minutes after smoothing; S2. Positioning of the test device: Place the tamping rod in the middle of the magnetic device, align the magnetic adsorption points with the electromagnetic rings, and drive the lower end of the tamping rod close to the surface of the concrete sample with a gap left; S3. Penetration test: The magnetic device is powered off, and the tamping rod is allowed to freely fall into the concrete. The penetration depth is recorded with an accuracy of 0.5 cm. The test duration shall not exceed 20 seconds. S4, parallel experiment: after the magnetic device is powered on, it absorbs the tamping rod and lifts it up. The second motor drives the magnetic device to rotate to the cleaning station, cleans it, and repeats the test. The first motor drives the tamping rod to move and change the landing point. The parallel test point is greater than 5 cm away from the previous test point. S5. Data processing: Take the arithmetic mean of the two test results as the penetration value. When the ratio of the two difference values ​​to the mean value exceeds 20%, the data collection result will be invalidated and retested.

[0015] In the preferred embodiment, the specific operation of layered loading in step S1 includes: ordinary fluid concrete is layered into the pot, and the height of each layer is one third of the height of the measuring pot. When tamping, the tamping rod is evenly tamped 25 times in a spiral shape from the edge to the center, and the tamping rod should penetrate the current layer to the surface of the next layer; After each layer is inserted and tamped, use a rubber hammer to knock along the outer wall of the measuring pot 5 to 10 times to compact it.

[0016] The present invention provides a device and method for rapid detection of concrete pumping performance, which have the following beneficial effects: high precision and reliability, the vertical free fall of a tamping rod is achieved through a magnetic suction device, and the friction offset error caused by traditional mechanical clamping is avoided; a timing device is accurately triggered by combining a photoelectric sensor and an acceleration sensor, and the penetration depth and stop time are recorded in real time, and the data is objective and reliable; the magnetic repulsion dynamic positioning technology ensures that the tamping rod is always located at the center axis position of the measuring bowl, eliminating the test error caused by radial offset.

[0017] The process is automated, with the lifting mechanism, the first motor and the second motor linked for control, enabling the lifting, rotation and position switching of the rammer without manual intervention; the cleaning station automatically completes the cleaning and drying of the rammer through the spraying device and the air drying device, avoiding the influence of residues on the results of parallel experiments.

[0018] Wide applicability and quantitative analysis, supporting the testing of ordinary flowing concrete and self-compacting concrete. Through differential treatment of layered sample loading or one-time filling, it meets the detection requirements of different types of concrete; taking the penetration depth as a quantitative index, combined with the data processing algorithm of the control center, it directly outputs the arithmetic mean or the error judgment result, reducing the randomness of subjective visual inspection.

[0019] Test consistency and repeatability. In parallel experiments, through the coordinated rotation of the eccentric rotating shaft and the electromagnetic ring, it ensures that the interval between the two test points is greater than 5 cm, eliminating the influence of uneven concrete performance distribution in the measuring cylinder; the spraying and air drying processes of the cleaning station are standardized to ensure the same surface state of the rammer, avoiding test deviations caused by residues or humidity changes.

[0020] Structural optimization and operational convenience. The lifting mechanism with a lead screw guide rail structure and the U-shaped connecting rod design take into account high-precision positioning and space avoidance, simplifying the operation process; the integrated control center integrates sensors, actuators and data processing modules, significantly reducing the labor intensity of workers.

[0021] In summary, through automated, high-precision and standardized design, the present invention solves the problems of large errors, dependence on manual labor, narrow application range, etc. existing in the traditional slump test method, and provides an efficient and reliable solution for the evaluation of concrete pumping performance. Brief Description of the Drawings

[0022] The present invention will be further described below in conjunction with the drawings and embodiments: Figure 1 It is the overall appearance structure diagram of the present invention; Figure 2 It is the overall appearance side view structure diagram of the present invention when the device is at the cleaning station; Figure 3 It is the overall appearance top view structure diagram of the present invention when the device is at the cleaning station; Figure 4 It is the structure diagram of the lifting mechanism of the present invention; Figure 5 It is the installation structure diagram of the magnetic attraction device of the present invention; Figure 6 It is the installation and disassembly structure diagram of the magnetic attraction device of the present invention; Figure 7 It is the directional detection and monitoring schematic diagram of the photoelectric sensor of the present invention; Figure 8It is the structural diagram of the ram rotating around the central axis of the measuring bowl in the present invention; Figure 9 It is the structural diagram of the spraying device in the present invention; Figure 10 It is the structural diagram of the air-drying device in the present invention; Figure 11 It is the structural connection diagram of the control system in the present invention.

[0023] In the figure: ram 1; magnetic adsorption point 101; measuring bowl 2; bracket 3; first arm 301; second arm 302; magnetic adsorption device 4; electromagnetic ring 401; eccentric rotating shaft 402; first motor 5; lifting mechanism 6; vertical guide rail 601; vertical lead screw 602; bearing limit seat 603; vertical slider 604; lifting motor 605; second motor 7; spraying device 8; spraying ring 801; water pump 802; spray head 803; air-drying device 9; distribution ring 901; air pump 902; air nozzle 903; connecting rod 10; photoelectric sensor 11; acceleration sensor 12; timing device 13; control center 200. Detailed implementation manners

[0024] Embodiment 1 As Figures 1 to 11 shown, a rapid detection device for the pumping performance of concrete includes a ram 1, a measuring bowl 2, a bracket 3 and a timing device 13. The graduated ram 1 is suspended above the measuring bowl 2 on one side of the bracket 3 through a magnetic adsorption device 4, and the output shaft of a first motor 5 coaxial with the measuring bowl 2 is connected to one side of the magnetic adsorption device 4 for driving the ram 1 to rotate around the central axis of the measuring bowl 2. A lifting mechanism 6 is provided on the bracket 3 to drive the magnetic adsorption device 4 to vertically lift along the bracket 3. A second motor 7 is connected to one side of the magnetic adsorption device 4 to drive the magnetic adsorption device 4 to rotate to a cleaning station on the other side of the bracket 3. The cleaning station includes a spraying device 8 and an air-drying device 9. A timing device 13 is fixed on the side of the bracket 3 for recording the time when the ram 1 penetrates into the concrete.

[0025] This application adopts a bracket 3 structure with multiple degrees of freedom to mechanize and automate the release, cleaning and repeated testing processes of the ram 1, eliminating the influence of manual operation on the experiment. The influence generated by friction during the falling of the ram 1 by the traditional bracket is eliminated through the electromagnetic adsorption mechanism, enabling the ram 1 to fall vertically and freely without rotational deviation. Through the rotation of the magnetic adsorption device 4 around the central axis of the measuring bowl 2, the points for multiple repeated tests are evenly arranged circumferentially, eliminating the differences in the concrete performance at different radial distances of the measuring bowl. The cleaning station washes away the residual concrete under the ram 1 through the spraying device 8 and dries the residual water through the air-drying device 9, avoiding parallel measurement errors caused by residues or incomplete drying during manual cleaning.

[0026] The rammer 1 is the same as the rammer used in the concrete slump test, a steel round rod with a diameter of 16 mm, a length of about 600 mm, and a hemispherical end. The mass of the rammer is 940 g ± 5 g. There are scales from the end of the rammer 1 to the handle, with a minimum spacing of 5 mm. The measuring bowl 2 is made of metal, with an inner diameter of 300 mm ± 2 mm and an inner height of 300 mm ± 2 mm.

[0027] In the preferred embodiment, two coaxially spaced electromagnetic rings 401 are connected by an eccentric rotating shaft 402 on one side to form a magnetic attraction device 4. A vertical connecting rod 10 is provided on one side of the bracket 3, and its end is located on the central axis of the measuring bowl 2 and is fixed with a first motor 5. The output shaft of the first motor 5 passes through the connecting rod 10 and is connected to the eccentric rotating shaft 402 to drive the magnetic attraction device 4 to rotate around the central axis of the measuring bowl 2. The distance from the central axis of the eccentric rotating shaft 402 to the central axis of the electromagnetic ring 401 is less than the radius of the measuring bowl 2.

[0028] By the rotation of the electromagnetic ring 401 around the eccentric rotating shaft 402, the points for parallel tests are located on the rotating circle centered on the electromagnetic ring 401. The circumferential extrusion forces and performance errors on the concrete on the same circumference are relatively small, reducing the initial parameter errors during parallel tests.

[0029] For parallel tests, the distance between the two penetration points is required to be greater than 5 cm, and the distance from the measurement point to the edge is not less than 5 cm. The experimental requirements can be met by setting the distance from the central axis of the eccentric rotating shaft 402 to the central axis of the electromagnetic ring 401.

[0030] In the preferred embodiment, when the two electromagnetic rings 401 are energized, they generate magnetic fields with the same polarity and the same direction, forming an axially superimposed magnetic field. Two magnetic adsorption points 101 with magnetic polarities opposite to those of the electromagnetic rings 401 are provided in the middle of the rammer 1. The axial distance between the two magnetic adsorption points 101 is equal to the axial spacing between the two electromagnetic rings 401. The rammer 1 is coaxially arranged in the middle of the magnetic field formed by the two electromagnetic rings 401, and axial positioning is achieved through magnetic repulsion.

[0031] After the two like-polarity electromagnetic rings 401 are energized, the magnetic fields generated axially have the same direction, forming a superimposed symmetric magnetic field distribution. The two magnetic adsorption points 101 in the middle of the rammer 1 have a repulsive effect on the magnetic fields of the electromagnetic rings 401. Since the distance between the electromagnetic rings 401 is equal to the distance between the magnetic adsorption points 101, when the rammer 1 is in the equilibrium position, the magnetic repulsive forces on the upper and lower sides are symmetrically distributed, forming a resultant force in the vertical direction to offset the gravity.

[0032] If the rammer 1 deviates from the equilibrium position, for example, it moves downward, the distance between the lower electromagnetic ring 401 and the magnetic adsorption point 101 decreases, the magnetic repulsive force increases, the distance above increases, and the repulsive force weakens. At this time, the net magnetic repulsive force is upward, forming a restoring force to make the rammer 1 return to the central position, achieving dynamic stability.

[0033] When the ram 1 is radially deviated from the center, the magnetic field gradient between one side electromagnetic ring 401 and the magnetic adsorption point 101 increases, while that on the other side decreases, resulting in the resultant force direction pointing to the center. This restoring force always pulls or pushes the ram 1 back to the center position, achieving dynamic stability.

[0034] This magnetic positioning method requires no mechanical contact, reduces wear, and is applicable to high-precision repeated positioning test occasions.

[0035] In the preferred solution, the structure of the lifting mechanism 6 is as follows: the vertical guide rail 601 and the vertical lead screw 602 are arranged in parallel on one side of the bracket 3 through the bearing limit seats 603 at both ends. The vertical slider 604 is threadedly connected to the vertical lead screw 602 through the lead screw nut part in the middle thereof, and is slidably connected to the vertical guide rail 601 on one side, constituting a linear guiding mechanism with double constraints. The lifting motor 605 passes through the bearing limit seat 603 and is connected to one end of the vertical lead screw 602 to drive the vertical slider 604 to vertically lift and lower.

[0036] The lifting mechanism 6 adopts a lead screw guide rail slider mechanism. The lead screw pair feeds through thread meshing, which can achieve high-precision positioning. The guide rail slider system bears the overturning moment to prevent the overall mechanism from tipping over. The parallel layout of the lead screw and the guide rail saves a large amount of installation space compared with an independent drive and guiding system, and the double constraint mechanism prevents motion instability.

[0037] In the preferred solution, the second motor 7 is fixed on the vertical slider 604. Its output shaft passes through the vertical slider 604 and is connected to one end of the connecting rod 10. The other end of the connecting rod 10 is connected to the magnetic adsorption device 4. The second motor 7 drives the magnetic adsorption device 4 to rotate around its output shaft.

[0038] In the preferred solution, the middle part of the connecting rod 10 is provided with a U-shaped bending structure, and its opening direction is perpendicular to the bracket 3, which is used to prevent the connecting rod 10 from interfering with the bracket 3 when the magnetic adsorption device 4 rotates to the cleaning station on the other side of the bracket 3 on the horizontal plane.

[0039] While serving as the release mechanism of the ram 1, the magnetic adsorption device 4 also serves as a transfer mechanism to transfer it from the experimental station to the cleaning station, reducing the participation of manpower.

[0040] In the preferred solution, the spraying device 8 includes a spraying ring 801, a water pump 802, and a plurality of spray heads 803 evenly arranged in the circumferential direction. The water pump 802 is communicated with the plurality of spray heads 803 through the spraying ring 801. The outlet direction of the spray heads 803 is obliquely downward and points to the area below the central axis of the spraying ring 801; The air drying device 9 includes a distribution ring 901, an air pump 902, and a plurality of air nozzles 903 evenly arranged in the circumferential direction. The air pump 902 is communicated with the plurality of air nozzles 903 through the distribution ring 901. The outlet direction of the air nozzles 903 is obliquely upward and points to a distance above the central axis of the distribution ring 901; The spraying device 8 and the air-drying device 9 are coaxially arranged on the other side of the bracket 3 through the first support arm 301 and the second support arm 302 respectively, and the spraying device 8 is located at a certain distance directly above the air-drying device 9.

[0041] The spraying device 8 is arranged above. The water flows down naturally to cover the surface of the rod-shaped object. By using gravity to enhance the water pressure impact force, for the ramming rod 1 vertically suspended, spraying from above can achieve a high surface wetting rate, avoiding the breakage of the water film due to gravity when spraying water at the bottom, or the sediment being washed back to the cleaned area when spraying water at the bottom.

[0042] The air-drying device 9 is arranged below. Multiple air nozzles 903 cause the air flow to converge on the water accumulation area at the end of the ramming rod 1, eliminating the residual water droplets. The wet surface after spraying is quickly dried by the air flow below, reducing the residual water accumulation, making the ramming rod 1 return to the state before the experiment, and eliminating the repeated parallel experiment errors caused by changes in the humidity, smoothness, quality, etc. of the ramming rod 1.

[0043] In the preferred solution, a photoelectric sensor 11 is provided at the height of the upper end face of the measuring cup 2 on one side of the bracket 3, and its emitting end faces the upper end face of the measuring cup 2, for monitoring the moment when the ramming rod 1 falls to trigger the timing device 13; An acceleration sensor 12 is provided at the upper end of the ramming rod 1, for detecting the moment when the penetration of the ramming rod 1 stops; The device further includes a control center 200. The timing device 13, the photoelectric sensor 11, the acceleration sensor 12 are communicatively connected to the control center 200, and the magnetic attraction device 4, the spraying device 8, the air-drying device 9, the lifting mechanism 6, the first motor 5, the second motor 7 are electrically connected to the control center 200.

[0044] The operating principle of this device is as follows: The initial position of the magnetic attraction device 4 is at the top of the stroke of the lifting mechanism 6. After the worker takes a clean ramming rod 1 and places it at the corresponding height in the middle of the magnetic attraction device 4 and powers it on, the ramming rod 1 is vertically stabilized above the first test point by magnetic repulsion force. Then, the lifting mechanism 6 drives the ramming rod 1 to move downward, making its lower end close to the surface of the concrete sample in the measuring cup 2 with a slight gap left, leaving a blank space for the detection of the photoelectric sensor 11.

[0045] The magnetic attraction device 4 is powered off, and the ramming rod 1 freely falls under the action of gravity and inserts into the concrete. At this time, the lifting mechanism 6 quickly rises to avoid interference caused by the skew of the ramming rod 1. The control center 200 records the moment when the magnetic attraction device 4 is powered off, the timing device 13 starts timing, and corrects the timing error through the signal that the ramming rod 1 starts to fall sensed by the photoelectric sensor 11. When the acceleration sensor 12 at the upper end of the ramming rod 1 monitors that the vertical acceleration returns to zero or is lower than a certain threshold, it sends a signal to the control center 200 to determine that the penetration is completed, or when the time measured by the timing device 13 reaches 20 s, the experiment ends. The user reads the scale on the side of the ramming rod 1 to obtain the penetration depth and records it, and the first test ends.

[0046] The lifting mechanism 6 drives the magnetic attraction device 4 to descend to the height corresponding to the magnetic attraction point 101 on the tamping rod 1. The magnetic attraction device 4 is energized to recapture the tamping rod 1. The lifting mechanism 6 rises to pull the lower end of the tamping rod 1 out of the measuring bowl 2. The second motor 7 rotates to drive the tamping rod 1 to rotate to the cleaning position on the other side of the bracket 3. The lifting mechanism 6 drives the lower end of the tamping rod 1 to extend into the spraying device 8 and the air-drying device 9, and repeatedly moves up and down in coordination with the flushing and air-drying process. After cleaning, the second motor 7 rotates to drive the tamping rod 1 back to the top of the measuring bowl 2.

[0047] The first motor 5 drives the tamping rod 1 to rotate a certain distance so that the tamping rod 1 is more than 5 cm away from the first test point, and a parallel experiment is performed.

[0048] Example 2 Further illustrate with reference to Example 1, Figures 1 to 11 The structure shown in the figure is a detection method of a concrete pumping performance rapid detection device, the method comprising: S1. Sample loading and processing: ordinary fluid concrete mixture is loaded into measuring bowl 2 in three layers, each layer is evenly rammed and vibrated until there are no bubbles on the surface, self-compacting concrete is filled at one time without vibration and ramming, excess concrete on the surface is scraped off, smoothed with a spatula, and left to stand for three minutes after smoothing; S2. Positioning of the test device: Place the tamping rod 1 in the middle of the magnetic device 4, align the magnetic adsorption point 101 with the electromagnetic ring 401, and the lifting mechanism 6 drives the lower end of the tamping rod 1 close to the surface of the concrete sample and leaves a gap; S3, penetration test: the magnetic device 4 is powered off, the tamping rod 1 freely falls into the concrete, and the penetration depth is recorded with an accuracy of 0.5 cm. The test duration does not exceed 20 seconds; S4, parallel experiment: after the magnetic device 4 is powered on, it absorbs the tamping rod 1 and lifts it up. The second motor 7 drives the magnetic device 4 to rotate to the cleaning position, clean it and repeat the test. The first motor 5 drives the tamping rod 1 to move and change the falling point. The parallel test point is greater than 5 cm away from the previous test point. S5. Data processing: Take the arithmetic mean of the two test results as the penetration value. When the ratio of the two difference values ​​to the mean value exceeds 20%, the data collection result will be invalidated and retested.

[0049] In the preferred embodiment, the specific operation of layered loading in step S1 includes: ordinary fluid concrete is layered into the pot, and the height of each layer is one third of the height of the measuring pot 2. When tamping, the tamping rod 1 is evenly tamped 25 times in a spiral shape from the edge to the center, and the tamping rod 1 should penetrate the current layer to the surface of the next layer; After each layer is inserted and rammed, the outer wall of the measuring bowl 2 is knocked 5 to 10 times with a rubber hammer to compact it.

[0050] After obtaining the data, through a large amount of data accumulation and fitting in the early stage, the quality of the concrete pumping performance corresponding to the penetration depth range obtained provides a basis for the experimenters to judge the working performance of the concrete.

[0051] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A device for quickly detecting the pumping performance of concrete, comprising a tamping rod (1), a measuring bowl (2), a bracket (3) and a timing device (13), wherein: A tamping rod (1) with scales is suspended above a measuring bowl (2) on one side of a support (3) via a magnetic device (4); an output shaft of a first motor (5) coaxially arranged with the measuring bowl (2) is connected to one side of the magnetic device (4) and is used to drive the tamping rod (1) to rotate around the central axis of the measuring bowl (2); a lifting mechanism (6) is provided on the support (3) to drive the magnetic device (4) to vertically lift and lower along the support (3); a second motor (7) is connected to one side of the magnetic device (4) and drives the magnetic device (4) to rotate to a cleaning station on the other side of the support (3); the cleaning station includes a spray device (8) and an air drying device (9); a timing device (13) is fixed to the side of the support (3) and is used to record the time when the tamping rod (1) penetrates into concrete.

2. A rapid detection device for concrete pumping performance according to claim 1, characterized in that: Two coaxially spaced electromagnetic rings (401) are connected via an eccentric rotating shaft (402) on one side to form a magnetic attraction device (4); a vertical connecting rod (10) is provided on one side of the bracket (3); the end of the connecting rod (10) is located on the central axis of the measuring bowl (2) and is fixed with a first motor (5); the output shaft of the first motor (5) passes through the connecting rod (10) and is connected to the eccentric rotating shaft (402), so as to drive the magnetic attraction device (4) to rotate around the central axis of the measuring bowl (2); The distance between the central axis of the eccentric rotating shaft (402) and the central axis of the electromagnetic ring (401) is smaller than the radius of the measuring bowl (2).

3. A rapid detection device for concrete pumping performance according to claim 2, characterized in that: When the two electromagnetic rings (401) are energized, magnetic fields with the same polarity and consistent direction are generated, forming a magnetic field superimposed along the axial direction; Two magnetic adsorption points (101) having magnetic polarities opposite to those of the electromagnetic ring (401) are provided in the middle of the tamping rod (1), and the axial spacing between the two magnetic adsorption points (101) is equal to the axial spacing between the two electromagnetic rings (401); The tamping rod (1) is coaxially arranged in the middle of the magnetic field formed by the two electromagnetic rings (401), and axial positioning is achieved through magnetic repulsion.

4. A rapid detection device for concrete pumping performance according to claim 1, characterized in that: The structure of the lifting mechanism (6) is as follows: the vertical guide rail (601) and the vertical lead screw (602) are arranged in parallel on one side of the bracket (3) through bearing limit seats (603) at both ends; the vertical slider (604) is threadedly connected to the vertical lead screw (602) through the middle lead screw nut part, and one side is slidably connected to the vertical guide rail (601), forming a bidirectionally constrained linear guide mechanism; the lifting motor (605) passes through the bearing limit seat (603) and is connected to one end of the vertical lead screw (602), driving the vertical slider (604) to lift vertically.

5. A rapid detection device for concrete pumping performance according to claim 4, characterized in that: The second motor (7) is fixed on the vertical slider (604), and its output shaft passes through the vertical slider (604) and is connected to one end of the connecting rod (10). The other end of the connecting rod (10) is connected to the magnetic attraction device (4). The second motor (7) drives the magnetic attraction device (4) to rotate around its output shaft.

6. A rapid detection device for concrete pumping performance according to claim 5, characterized in that: A U-shaped bent structure is provided in the middle of the connecting rod (10), the opening direction of which is perpendicular to the bracket (3), so that when the magnetic attraction device (4) rotates on a horizontal plane to a cleaning station on the other side of the bracket (3), the connecting rod (10) does not interfere with the bracket (3).

7. A rapid detection device for concrete pumping performance according to claim 1, characterized in that: The spray device (8) comprises a spray ring (801), a water pump (802) and a plurality of spray heads (803) uniformly arranged in a circumferential direction; the water pump (802) is connected to the plurality of spray heads (803) through the spray ring (801); the outlet direction of the spray head (803) is obliquely downward toward the area below the central axis of the spray ring (801); The air drying device (9) comprises a distribution ring (901), an air pump (902) and a plurality of air nozzles (903) uniformly arranged in a circumferential direction, wherein the air pump (902) is connected to the plurality of air nozzles (903) through the distribution ring (901), and the outlet direction of the air nozzles (903) is obliquely upward and directed a distance above the central axis of the distribution ring (901); The spray device (8) and the air drying device (9) are coaxially arranged on the other side of the bracket (3) through the first support arm (301) and the second support arm (302), respectively, and the spray device (8) is located a distance directly above the air drying device (9).

8. A rapid detection device for concrete pumping performance according to claim 1, characterized in that: A photoelectric sensor (11) is provided at the height of the upper end surface of the measuring bowl (2) on one side of the bracket (3), with its emitting end facing the upper end surface of the measuring bowl (2) for monitoring the falling moment of the tamping rod (1) and triggering the timing device (13); An acceleration sensor (12) is provided at the upper end of the tamping rod (1) for detecting the moment when the tamping rod (1) stops penetrating; The device further comprises a control center (200); the timing device (13), the photoelectric sensor (11), and the acceleration sensor (12) are communicatively connected to the control center (200); and the magnetic suction device (4), the spray device (8), the air drying device (9), the lifting mechanism (6), the first motor (5), and the second motor (7) are electrically connected to the control center (200).

9. The detection method of the rapid detection device for concrete pumping performance according to any one of claims 1 to 8, characterized in that: The method includes: S1. Sample loading and processing: ordinary fluid concrete mixture is loaded into the measuring bowl (2) in three layers, each layer is evenly rammed and vibrated until there are no bubbles on the surface; self-compacting concrete is filled in one go without vibration or ramming, excess concrete on the surface is scraped off, smoothed with a spatula, and left to stand for three minutes after smoothing; S2. Positioning the test device: placing the tamping rod (1) in the middle of the magnetic attraction device (4), aligning the magnetic attraction point (101) with the electromagnetic ring (401), and driving the lower end of the tamping rod (1) to approach the surface of the concrete sample with a gap left by the lifting mechanism (6); S3. Penetration test: the magnetic device (4) is powered off, and the tamping rod (1) is allowed to freely fall into the concrete. The penetration depth is recorded with an accuracy of 0.5 cm. The test duration shall not exceed 20 seconds. S4, parallel experiment: after the magnetic suction device (4) is powered on, it absorbs the tamping rod (1) and lifts it up, the second motor (7) drives the magnetic suction device (4) to rotate to the cleaning position to clean it and repeat the test, the first motor (5) drives the tamping rod (1) to move and change the landing point, and the parallel test point is separated from the previous test point by more than 5 cm; S5. Data processing: Take the arithmetic mean of the two test results as the penetration value. When the ratio of the two difference values ​​to the mean value exceeds 20%, the data collection result will be invalidated and retested.

10. The detection method according to claim 9, characterized in that: The specific operation of layered loading in step S1 includes: ordinary fluid concrete is layered into the pot, and the height of each layer is one third of the height of the measuring pot (2). When tamping, the tamping rod (1) is evenly tamped in a spiral shape from the edge to the center for 25 times, and the tamping rod (1) should penetrate the current layer to the surface of the next layer; After each layer is inserted and rammed, the outer wall of the measuring bowl (2) is struck 5 to 10 times with a rubber hammer to compact it.

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