CN111716539B - Method, device and system for detecting slump and stirring type engineering machinery - Google Patents
Method, device and system for detecting slump and stirring type engineering machinery Download PDFInfo
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- CN111716539B CN111716539B CN202010549979.3A CN202010549979A CN111716539B CN 111716539 B CN111716539 B CN 111716539B CN 202010549979 A CN202010549979 A CN 202010549979A CN 111716539 B CN111716539 B CN 111716539B
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- 238000003756 stirring Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 132
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- 238000009434 installation Methods 0.000 claims description 13
- 238000010276 construction Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 11
- 238000001125 extrusion Methods 0.000 claims description 9
- 238000013019 agitation Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 25
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/42—Apparatus specially adapted for being mounted on vehicles with provision for mixing during transport
- B28C5/4203—Details; Accessories
- B28C5/4206—Control apparatus; Drive systems, e.g. coupled to the vehicle drive-system
- B28C5/422—Controlling or measuring devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
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Abstract
The invention relates to the field of engineering machinery, and discloses a method, a device and a system for detecting slump and stirring type engineering machinery. The method comprises the following steps: judging whether the volume of concrete in a concrete container mounted on a drum of the stirring type engineering machine is changed from a first preset volume to a second preset volume along with the rotation of the drum; determining a slump detection parameter corresponding to the concrete when the volume is changed from the first preset volume to the second preset volume, wherein the slump detection parameter is the time or angle of rotation of the roller when the volume is changed from the first preset volume to the second preset volume; and determining the slump of the concrete based on the determined slump detection parameters and preset corresponding relations, wherein the preset corresponding relations are the corresponding relations between the slump detection parameters and the slump. Therefore, automatic slump detection without manual participation is realized.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a method, a device and a system for detecting slump and stirring type engineering machinery.
Background
At present, the premixed concrete lacks effective quality monitoring in a transportation link, the quality of the concrete cannot be prevented in advance, unqualified concrete has huge influence on the quality of a main engineering body, and simultaneously, a concrete producer, a logistics company and a constructor can tear skins, so that a responsible body with out-of-control concrete quality cannot be distinguished.
The quality of concrete is mainly examined for the homogeneity of the concrete, and an important technical index for evaluating the homogeneity is the slump of the concrete. In the prior art, there are mainly the following methods for detecting slump: the first is to adopt a manual operation as a main mode according to the GB/T26408 product standard, as shown in figure 1; the second is that the hydraulic system (or a speed reducer) is provided with a pressure (or torque) sensor, and the loss or the change of the concrete slump is monitored through the change of the pressure; thirdly, calculating the slump by using low-speed energy/speed/slump curve data or a pre-stored equation, wherein the slump is obtained as a function of the slope of a line segment; the fourth is to monitor concrete slump by a system that measures the moisture and consistency of the materials to be mixed in a drum mixer. The prior art slump detection method has the following disadvantages: the efficiency is low, the investment is large, the means is backward, the labor intensity is large, the manpower and material resources are greatly wasted, and the time and the labor are wasted; the influence factors are many, and data distortion is easily caused; real-time online detection cannot be achieved; automatic detection cannot be realized; the measurement accuracy is influenced by the characteristics of raw materials and the using working conditions (material pressure stability, engine rotating speed, mixing drum rotating speed and the like), the measurement accuracy is low, the slump cannot be accurately reflected, and the practical value is not high.
Disclosure of Invention
The object of the present invention is to provide a method, a device and a system for slump detection and a stirring type engineering machine which are capable of solving or at least partially solving the above technical problems.
In order to achieve the above object, an aspect of the present invention provides a method for detecting slump of concrete in a stirring type working machine, the method comprising: judging whether the volume of concrete in a concrete container mounted on a drum of the stirring type engineering machine is changed from a first preset volume to a second preset volume along with the rotation of the drum; determining a slump detection parameter corresponding to the concrete when the volume is changed from the first preset volume to the second preset volume, wherein the slump detection parameter is the time or angle of rotation of the roller when the volume is changed from the first preset volume to the second preset volume; and determining the slump of the concrete based on the determined slump detection parameters and preset corresponding relations, wherein the preset corresponding relations are the corresponding relations between the slump detection parameters and the slump.
Optionally, the determining whether the volume of concrete in the concrete container mounted on the drum of the mixer-type construction machine changes from a first preset volume to a second preset volume with the rotation of the drum comprises: acquiring torque generated by pouring out concrete in the concrete container in the rotation process of the roller; and judging whether the torque is changed from a first preset torque to a second preset torque or not, wherein the first preset torque corresponds to the first preset volume, and the second preset torque corresponds to the second preset volume.
Optionally, the torque obtained is determined based on: acquiring the difference of pressures of two wall surfaces of the concrete container at opposite positions due to the extrusion of the concrete in the rotation process of the roller, wherein the two wall surfaces have different heights from the ground except the lowest position and the highest position of the roller in the rotation process of the roller; and determining the torque based on the difference.
Optionally, the installation position of the concrete container along the axis of the drum satisfies the following condition: in the cylindrical part of the roller, in the direction which passes through the installation position and is vertical to the axis in the section of the roller, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7.
Optionally, the angle θ between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees.
Optionally, the preset correspondence is determined based on: determining the slump detection parameter corresponding to each sample in the concrete samples; and determining the preset corresponding relation based on the slump detection parameters and the slump corresponding to each sample in the concrete samples.
Accordingly, another aspect of the present invention provides an apparatus for detecting slump of concrete in a stirring type working machine, the apparatus comprising: the system comprises a judging module, a judging module and a control module, wherein the judging module is used for judging whether the volume of concrete in a concrete container installed on a roller of the stirring type engineering machinery is changed from a first preset volume to a second preset volume along with the rotation of the roller; determining slump detection parameters, wherein the slump detection parameters are used for determining slump detection parameters corresponding to the concrete when the volume is changed from the first preset volume to the second preset volume, and the slump detection parameters are the rotating time or angle of the roller when the volume is changed from the first preset volume to the second preset volume; and the slump determination module is used for determining the slump of the concrete based on the determined slump detection parameters and the preset corresponding relation, wherein the preset corresponding relation is the corresponding relation between the slump detection parameters and the slump.
Optionally, the determining module determining whether the volume of concrete in the concrete container mounted on the drum of the agitator type working machine changes from a first preset volume to a second preset volume with the rotation of the drum includes: acquiring torque generated by pouring out concrete in the concrete container in the rotation process of the roller; and judging whether the torque is changed from a first preset torque to a second preset torque or not, wherein the first preset torque corresponds to the first preset volume, and the second preset torque corresponds to the second preset volume.
Optionally, the torque obtained is determined based on: acquiring the difference of pressures of two wall surfaces of the concrete container at opposite positions due to the extrusion of the concrete in the rotation process of the roller, wherein the two wall surfaces have different heights from the ground except the lowest position and the highest position of the roller in the rotation process of the roller; and determining the torque based on the difference.
Optionally, the installation position of the concrete container along the axis of the drum satisfies the following condition: in the cylindrical part of the roller, in the direction which passes through the installation position and is vertical to the axis in the section of the roller, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7.
Optionally, the angle θ between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees.
Optionally, the preset correspondence is determined based on: determining the slump detection parameter corresponding to each sample in the concrete samples; and determining the preset corresponding relation based on the slump detection parameters and the slump corresponding to each sample in the concrete samples.
Further, another aspect of the present invention provides a system for detecting slump of concrete in a stirring type working machine, the system including: the above-described apparatus; a concrete container installed on a drum of the agitation type construction machine, for containing concrete; the angle detection module is used for detecting the rotating angle of the roller; the force detection module is used for detecting the difference of the pressures of the two wall surfaces of the concrete container in opposite positions caused by the extrusion of the concrete in the rotation process of the roller; and/or a torque detection module for detecting the torque generated by the concrete in the concrete container being poured out during the rotation of the roller.
Optionally, the torque detection module is detachable and is connected with the metering connecting rod and the mounting plate fixedly, the mounting plate is connected with the manhole cover plate fixedly, and the metering connecting rod is connected with a preset distance from the manhole cover plate.
In addition, the invention also provides an agitating type engineering machine, which comprises the system.
In addition, another aspect of the present invention also provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the above-mentioned method.
Through the technical scheme, the automatic slump detection without manual participation is realized. In addition, above-mentioned technical scheme automated inspection slump only needs to confirm the change of the volume of concrete and slump test parameter can confirm the slump, and the input is less, has improved work efficiency, and intensity of labour is little, need not to spend very big manpower and material resources. In addition, the technical scheme has the advantages of simple process, few influence factors, difficulty in causing data distortion, capability of ensuring accuracy, capability of detecting slump on line in real time and automatic detection. According to the technical scheme, when the slump is detected, the slump is not influenced by a plurality of factors such as the characteristics of raw materials and the use working conditions, the measurement precision is improved, the slump can be accurately reflected, and the technical scheme has strong practicability.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic illustration of manually measuring slump;
FIG. 2 is a flowchart of a method for detecting slump of concrete in a stirring type working machine according to another embodiment of the present invention;
FIG. 3 is a schematic view of a concrete container and a detection sensor installed in accordance with another embodiment of the present invention;
FIG. 4 is a schematic view of the change in volume and shape of the material in the measuring hopper when the mixing drum rotates according to another embodiment of the present invention;
FIG. 5 is a schematic diagram of a torque sensor and signal acquisition operation according to another embodiment of the present invention;
FIG. 6 is a schematic view of an assembled measuring hopper mounting structure provided in accordance with another embodiment of the present invention;
FIG. 7 is a schematic view of a hopper installation location provided by another embodiment of the present invention;
FIG. 8 is a schematic view of the angle of the tangent to the drum circumference of the hopper axis provided by another embodiment of the present invention; and
fig. 9 is a block diagram illustrating an apparatus for detecting slump of concrete in a mixer type construction machine according to another embodiment of the present invention.
Description of the reference numerals
1 judging module and 2 slump detection parameter determining module
3 slump confirms module 4 concrete splendid attire container and detection sensor
5 torque sensor 6 measures connecting rod
7 weighing hopper 8 rubber block
9 stirring cylinder wall 10 manhole cover plate
11 screw 12 wall
13 mounting plate
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In view of the technical problems in the prior art, how to quickly, accurately and effectively detect the concrete slump is significant in effectively improving the production efficiency of the concrete, realizing the automatic control of the production process and enhancing the quality management of the concrete, and the market demand is more and more urgent. Therefore, a set of slump on-line detection system is carried on the concrete mixer truck, so that the slump change condition of concrete in a transportation link can be mastered in real time, a foundation is laid for follow-up product improvement and full-link concrete quality intelligent control, and the core competitiveness of products is greatly improved.
An aspect of an embodiment of the present invention provides a method for detecting slump of concrete in a hybrid construction machine, and in particular, the embodiment may be applied to a concrete mixer truck.
Fig. 2 is a flowchart of a method for detecting slump of concrete in a stirring type working machine according to an embodiment of the present invention. As shown in fig. 2, the method includes the following.
In step S20, it is determined whether the volume of concrete in the concrete container mounted on the drum of the mixer-type construction machine changes from the first preset volume to the second preset volume as the drum rotates. If yes, go to step S21; if not, go to step S20. The concrete container is used for containing concrete needing slump detection and is installed on the roller. With the rotation of the drum, the concrete is poured out of the container, and the volume of the concrete in the container becomes smaller. Alternatively, in embodiments of the invention, the concrete containment vessel may be a weighing hopper. Furthermore, in an embodiment of the present invention, the first predetermined volume may be the volume of the container, i.e. the container is filled with concrete. In addition, the second preset volume may be 0, that is, the receiving container is emptied as the drum rotates. It should be noted that the first preset volume and the second preset volume may be set according to actual situations, and this is not intended to limit the present invention.
Alternatively, in embodiments of the present invention, there are many ways to determine whether the volume of concrete in the concrete container changes from the first predetermined volume to the second predetermined volume as the drum rotates. For example, the torque may be determined based on the torque generated by the concrete in the concrete container being poured out. Along with the rotation of cylinder, the concrete in the splendid attire container is poured, produces the moment of torsion because of the concrete in the splendid attire container is poured, and along with the concrete is poured, the volume of concrete reduces gradually, and the moment of torsion that produces changes. The first preset volume of concrete in the concrete container corresponds to a first preset torque, and the second preset volume corresponds to a second preset torque. Therefore, whether the volume of the concrete is changed from the first preset volume to the second preset volume can be judged according to whether the torque is changed from the first preset torque to the second preset torque.
Specifically, the judging whether the volume of concrete in the concrete container installed on the drum of the agitation type construction machine is changed from the first preset volume to the second preset volume with the rotation of the drum includes: acquiring torque generated by pouring out concrete in the concrete container in the rotating process of the roller; and judging whether the torque is changed from a first preset torque to a second preset torque, wherein the first preset torque corresponds to a first preset volume, and the second preset torque corresponds to a second preset volume.
In the practice of the present invention, there are many ways to determine the torque generated by the concrete in the concrete containment vessel being poured out. For example, one way may be to mount a torque sensor on the concrete container that measures the torque generated by the concrete in the concrete container being poured out. Further, it is also possible to determine the torque based on the generated pressure difference by detecting the pressure difference generated on the container due to the concrete being poured out. Specifically, the torque obtained during the rotation of the drum due to the concrete in the concrete container being poured out may be determined based on the following. And acquiring the difference of the pressures of the two walls of the concrete container at opposite positions due to the extrusion of the concrete in the rotation process of the roller, wherein the heights of the two walls from the ground are different except the lowest position and the highest position of the roller in the rotation process of the roller. Based on the difference, a torque is determined. Alternatively, a force sensor may be used to detect the difference in pressure. As shown in fig. 4, when the drum is at the lowest position, the container is filled with concrete, and as the drum rotates, the concrete is poured out, and the volume of the concrete in the container is reduced. The upper and lower walls 12 of the container (the height of the walls 12 from the ground is different with the rotation of the roller) are subject to different pressures of concrete, and the pressure difference between the two walls 12 is detected. And the torque is determined from the pressure difference.
In step S21, in the case that the volume of the concrete is changed from the first preset volume to the second preset volume, determining a slump detection parameter corresponding to the concrete, wherein the slump detection parameter is a time or an angle of rotation of the drum when the volume is changed from the first preset volume to the second preset volume. Wherein, if the detection parameter is the angle that the cylinder rotated, can use angle detection module to detect when the volume of concrete changes from first volume of predetermineeing to the second volume of predetermineeing, the angle that the cylinder rotated, for example, adopts angle sensor to detect. In addition, if the detection parameter is time, a timer can be used for timing to determine the time for rotating the roller when the volume of the concrete is changed from a first preset volume to a second preset volume; it is also possible to determine the angle through which the drum is rotated, and then determine the time during which the drum is rotated in combination with the angular velocity at which the drum is rotated. In addition, in the case that the detection parameter is the rotation angle of the drum, the rotation time of the drum may be determined first, and then the rotation angle of the drum may be determined according to the rotation angular velocity of the drum.
In step S22, the slump of the concrete is determined based on the determined slump detection parameter and a preset corresponding relationship, wherein the preset corresponding relationship is a corresponding relationship between the slump detection parameter and the slump. Presetting and determining the corresponding relation between slump detection parameters and slump, and determining the slump corresponding to the slump detection parameters determined in real time based on the preset and determined corresponding relation under the condition of determining the slump detection parameters in real time. The preset corresponding relation can be a relation curve between slump detection parameters and slump. When the slump is determined based on the preset corresponding relation, if the corresponding slump detection parameters determined in real time exist on the relation curve, the slump can be directly determined based on the relation curve; and if no detection parameter value corresponding to the slump detection parameter determined in real time exists on the relation curve, determining the slump corresponding to the slump detection parameter detected in real time based on the relation curve and a single increase relation between the slump detection parameter and the slump, wherein the single increase relation is that the larger the slump detection parameter is, the smaller the slump is. Specifically, two slump detection parameter values are selected on the relation curve, the slump detection parameter detected in real time is between the two selected detection parameter values, and the slump corresponding to the slump detection parameter detected in real time is estimated based on the slump and the single increment relation respectively corresponding to the two selected detection parameter values on the relation curve.
Alternatively, there are many ways to determine the preset correspondence between the slump-detecting parameter and the slump. For example, the device designed in the embodiment of the present invention may be adopted, and concrete detection samples with known slump are combined to determine slump detection parameters corresponding to each detection sample (the method described in the above embodiment is adopted to determine slump detection parameters of each detection sample), so as to determine the preset corresponding relationship between the concrete slump detection parameters and the slump based on the slump detection parameters and the slump corresponding to each detection sample. Specifically, the preset correspondence is determined based on: determining slump detection parameters corresponding to each sample in the concrete samples; and determining a preset corresponding relation based on the slump detection parameters and slump corresponding to each sample in the concrete samples. The number of detection samples can be selected according to actual conditions, and the higher the number is, the higher the precision is.
Through the technical scheme, the automatic slump detection without manual participation is realized. In addition, above-mentioned technical scheme automated inspection slump only needs to confirm the change of the volume of concrete and slump test parameter can confirm the slump, and the input is less, has improved work efficiency, and intensity of labour is little, need not to spend very big manpower and material resources. In addition, the technical scheme has the advantages of simple process, few influence factors, difficulty in causing data distortion, capability of ensuring accuracy, capability of detecting slump on line in real time and automatic detection. According to the technical scheme, when the slump is detected, the slump is not influenced by a plurality of factors such as the characteristics of raw materials and the use working conditions, the measurement precision is improved, the slump can be accurately reflected, and the technical scheme has strong practicability.
Alternatively, in the embodiment of the present invention, the installation position of the concrete container on the drum may be set according to specific situations, as long as the conversion of the volume of the concrete from the first preset volume to the second preset volume can be realized during the rotation of the drum. Specifically, the position where the concrete container is installed may satisfy the following condition. The installation position of the concrete container along the axis of the roller meets the following conditions: in the cylindrical part of the roller, in the cross section of the roller along the mounting position and in the direction vertical to the axis, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7. As shown in fig. 7, the concrete container is a measuring hopper, which is mounted on the cylindrical portion of the drum. In the section of the roller, in the direction perpendicular to the axis of the roller and at the position of the over-metering point, the ratio m of the distance L1 from the concrete standing liquid level to the wall of the roller contacted with the concrete (the other wall of the roller is not contacted with the concrete) to the diameter L of the roller satisfies 0.3-0.7.
Alternatively, in the embodiment of the present invention, the concrete container may be placed according to specific situations, as long as the conversion of the volume of the concrete from the first preset volume to the second preset volume can be achieved during the rotation of the drum. Specifically, the angle theta between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees. As shown in fig. 8, the concrete container is a measuring hopper, and the included angle a between the axis of the measuring hopper and the tangent of the circumference of the drum is 90 °.
The logic of the method for detecting the slump of the concrete in the stirring type engineering machine provided by the embodiment of the invention is described in an exemplary manner in combination with fig. 3-8. Wherein, the concrete container can be a measuring hopper, and the stirring type engineering machinery can be a mixer truck. In addition, in the technical solution provided by the embodiment of the present invention, a concrete container and a detection sensor are used, wherein the installation positions of the concrete container and the detection sensor 4 can be referred to as fig. 3. In addition, one or several concrete containers are arranged inside the mixing drum (equivalent to the drum described in the embodiments of the present invention), and the detection sensor may comprise a load cell and/or a torque sensor, from which the torque is determined. With the concrete container in the bottom position, the cup is filled with concrete, as shown in fig. 4. The concrete container rotates anticlockwise along with the roller, the materials in the cup are poured out slowly, and as the rotation angle of the roller is increased, the concrete materials in the cup are poured out slowly as shown in figure 4. Eventually emptying between turning to approximately the three o 'clock position to the one o' clock position. For the concrete with the same grade, the emptying time or the emptying angle is different according to different slumps. The collapse degree is large, so that the air can be emptied earlier, and the collapse degree is small, so that the emptying time is delayed.
In the following description, a concrete container is taken as an example of a weighing hopper. The scheme of the measuring hopper rotating together with the mixing drum is adopted, and the time (or the corresponding angle interval) for changing the material in the measuring hopper from large to small is acquired. A torque sensor or a force sensor is arranged at the bottom of the measuring hopper, a torque or force change value caused by the volume change of materials in the hopper is detected, and meanwhile, the real-time rotating speed (which is equal to the angular speed in the embodiment) of the mixing drum is collected to serve as an additional influence factor, for example, when the correlation size and the relation curve between the detected physical quantity and the slump of concrete are established, the influence of the rotating speed is considered, so that the slump detection accuracy is improved. The volume and shape changes of the material in the measuring hopper when the mixing drum rotates are shown in fig. 4.
Weak signals output by a detection sensor (such as a torque sensor or a force sensor) are processed and amplified by a transmitter to form constant current source signals or voltage signals, then the constant current source signals or the voltage signals are converted into digital signals by an analog quantity collector, and the digital signals are sent to a data processing unit on a cab or a frame by a wireless digital transmission transceiver to process the detection signals and finally obtain detection results. The torque sensor and signal acquisition operating principle is shown in fig. 5.
The hopper mounting structure is assembled schematically as shown in fig. 6. The torque sensor 5 is detachably (e.g. screwed) fixedly connected to the measuring link 6 and the mounting plate 13, wherein the mounting plate 13 is fixedly connected to the manhole cover 10 (e.g. welded or bonded), the measuring link 6 is connected to the mounting plate 13 through the torque sensor 5, and the distance between the measuring link 6 and the manhole cover 10 is a predetermined distance, wherein the predetermined distance can be set according to specific conditions, so that when the volume of the material in the measuring hopper 7 changes, the upper and lower screws 11 transmit pressure to the torque sensor 5.
The metering connecting rod 6 is connected with a metering hopper 7 (the cross section of the metering hopper is preferably oval) through an upper screw 11 and a lower screw 11 and a rubber block 8, wherein the rubber block 8 plays a role in sealing. When the mixing drum rotates, the volume and the shape of the materials in the metering hopper 7 are changed, and the load difference is transmitted to the torque sensor 5 (or the load difference is transmitted to the force sensor) through the upper end screw 11 and the lower end screw 11.
The physical quantity detection sensor may be selected, arranged, and installed as shown in fig. 7. The mounting position of the hopper along the drum axis needs to be carefully selected. Selection principle: as shown in FIG. 7, the value of L1/L is between 0.3 and 0.7 (the principle is selected to satisfy the two states of the weighing hopper being full and empty as much as possible in the process of one rotation of the mixing drum, and the number of the weighing hoppers is not limited). As is known to those familiar with mixer trucks, the mixing drum is typically tilted at an angle, and the material in the mixing drum is not completely full, and if it is completely full, our solution is not used because it is necessary to detect the change in drum angle or the change in time during the process from relatively full to relatively empty of material in the hopper. If the weighing hopper is filled fully, the weighing hopper is always filled properly, and the change is difficult to detect. Even if it is not really full, it does not mean that the variation can be measured with certainty, which is very relevant to the position of the weighing hopper in the axial direction. If the hopper is mounted in a very forward position, as shown in fig. 7, there is little room left above the mixing drum when it rotates, so that the hopper is almost always quite full, which is not conducive to our detection. If the mixing drum is arranged very close to the rear, a large space is left above the mixing drum when the mixing drum rotates, and little material is left below the mixing drum, so that the metering hopper is only slightly arranged or even not arranged, and the detection is not facilitated. Therefore, a suitable position is selected so that the material in the weighing hopper has a significant volume and weight change when the mixing drum rotates one revolution. A value of L1/L of between 0.3 and 0.7 (including the ratio of 0.3 to 0.7) is a suitable position. )
The angle a (theta in the above embodiment) between the axis of the hopper and the tangent to the circumference of the drum may be other than a right angle, and may be between 45 deg. and 90 deg., including 45 deg. and 90 deg.. The range of the angle a is explained below. The weighing hopper is enabled to be filled and emptied as clearly as possible under various liquid levels in the process of rotating the roller for one circle. For example, fig. 8 shows a state of 90 °, so that if the liquid level is far below the central line of the mixing drum, there is no problem, the material in the measuring hopper rotates counterclockwise along with the mixing drum, in the process that the measuring hopper moves from the mouth up to the mouth toward the left, the material begins to be poured early, and the measuring hopper empties after the mixing drum rotates for a plurality of angles, so that a complete emptying process is realized, the crossing time or the rotating angle of the mixing drum is large enough, and the difference can be measured smoothly. However, if the level of the liquid in the mixing drum is relatively high, for example, above the center line of the mixing drum, the weighing hopper will not pour the material until a long time, because the weighing hopper is immersed in the whole concrete material, and although the weighing hopper is already crossed, the material in the weighing hopper cannot be poured out under the action of gravity. When the mixing drum continues to rotate to a certain angle, the metering hopper begins to dump, but the dumping process is short, and the metering hopper is emptied at a moment. The time span is too short, which has a strong influence on the accuracy of our measurements. If the weighing hopper is installed at an angle in advance, the weighing hopper is not easy to be soaked in the concrete material, and the dumping time of the weighing hopper is late by the angle. Therefore, if the liquid level is high, the hopper should be mounted at an angle, shown as angle a.
The hopper cross-section is not limited to circular. The ratio of the transverse (along the axial direction of the roller) size of the weighing hopper to the up-down (along the circumferential direction of the cross section of the roller) size is 0.4-0.9.
The torque generated by the material carried by the measuring hopper is transmitted out by the upper screw and the lower screw, and the torque is formed by the stress difference on the screws. The torque can be directly detected by a torque sensor, and the force sensor can also be used for detecting the stress difference value of the two screws, so that the torque can be calculated based on the stress difference value.
And acquiring the correlation magnitude between the detected physical quantity (the time or the angle of the roller rotating) of the concrete and the slump and a relation curve thereof. The method has the advantages that the angle of the cement concrete roller is obtained, the rotating speed parameter of the roller is also obtained, the rotating speed parameter is used as an additional influence factor for constructing the correlation size and the relation curve between the detected physical quantity and the slump, and the slump detection accuracy is improved. Specifically, the rotation speed may cause a time point when the drum is empty to be delayed, that is, the actual time or angle that the drum corresponding to the slump rotates is smaller than the detected time or angle, so that when the relationship curve is established, the detection parameter (the time or angle that the drum rotates) may be corrected, specifically, the detection parameter is reduced, so that the correspondence between the detection parameter and the slump is more accurate, and the slump detection accuracy is improved. In addition, the single increase relation between the slump and the detection parameters is that the detection parameters with large slump are small, and the detection parameters with small slump are large, so that the detection parameters are corrected to make up the time delay caused by the rotating speed, and the slump can be corrected based on the single increase relation, specifically, the slump is reduced, so that the corresponding relation between the detection parameters and the slump is more accurate. When the preset corresponding relation between the slump detection parameter (the time or the angle of the roller rotating) and the slump is determined, the number of the sampling samples is usually 500-5000. For each detection sample, the detection parameter value (the time or angle of the drum rotating) of each circle of the mixing drum is used as a sample value, the arithmetic mean value of the sample values is taken as the final detection parameter value, namely, for each detection sample, the corresponding detection parameter value is determined by rotating the mixing drum for multiple circles, and the arithmetic mean value of the detection parameter value corresponding to each circle is taken as the final detection parameter value of the detection sample.
The technical scheme provided by the embodiment of the invention has the following advantages. 1. The measuring hopper is initiated in industry, advanced in technology and high in practical value, changes of the size of force are sensed through acquiring the fluidity of concrete in the measuring hopper, and therefore slump detection is achieved by researching the relation between the slump and the concrete and is completely consistent with actual working conditions. The FL-MOBIMIC-analyzer popularized in the market at present is a concrete on-line measuring system, mainly comprises a microwave humidity measuring probe and a viscosity measuring rod (with a transmitting unit), and is used for recording a plurality of process parameters in a concrete mixer truck, wherein the process parameters comprise concrete humidity, viscosity, slump, concrete temperature, the rotating speed and the direction of a mixing drum and the like. The FL-MOBIMIC-analyzer detects slump through concrete humidity and viscosity, has weak relevance in principle, is influenced by a plurality of raw material characteristics and use working conditions (material pressure stability and the like) in measurement precision, has low practical value, does not enter an application stage even after being popularized for many years, and has no market application. 2. Performing real-time online detection to obtain slump data in time; manual intervention is not needed, and the whole process is automatically measured; at present, most of the industries adopt manual detection of concrete slump, so that the method is backward, the labor intensity is high, and time and labor are wasted; and the influence factors are many, the sample number is few, and data distortion is easily caused. 3. The cost advantage is obvious, and the method is favorable for batch application.
Accordingly, another aspect of the embodiments of the present invention provides an apparatus for detecting slump of concrete in a stirring type working machine.
Fig. 9 is a block diagram illustrating an apparatus for detecting slump of concrete in a mixer type construction machine according to another embodiment of the present invention. As shown in fig. 9, the apparatus includes a judgment module 1, a slump-detecting parameter determination module 2, and a slump determination module 3. The judging module 1 is used for judging whether the volume of concrete in a concrete container installed on a roller of the stirring type engineering machine is changed from a first preset volume to a second preset volume along with the rotation of the roller; the slump detection parameter determination 2 is used for determining a slump detection parameter corresponding to the concrete under the condition that the volume is changed from a first preset volume to a second preset volume, wherein the slump detection parameter is the rotating time or angle of the roller when the volume is changed from the first preset volume to the second preset volume; the slump determination module 3 is used for determining the slump of the concrete based on the determined slump detection parameters and a preset corresponding relation, wherein the preset corresponding relation is the corresponding relation between the slump detection parameters and the slump.
Optionally, in an embodiment of the present invention, the determining module that determines whether the volume of concrete in the concrete container installed on the drum of the stirring type construction machine changes from the first preset volume to the second preset volume with the rotation of the drum includes: acquiring torque generated by pouring out concrete in the concrete container in the rotating process of the roller; and judging whether the torque is changed from a first preset torque to a second preset torque, wherein the first preset torque corresponds to a first preset volume, and the second preset torque corresponds to a second preset volume.
Optionally, in an embodiment of the invention, the torque obtained is determined based on: in the rotation process of the roller, acquiring the difference of pressures of two wall surfaces of the concrete container at opposite positions, which are subjected to extrusion of concrete, wherein in the rotation process of the roller, except the rotation of the roller to the lowest position and the highest position, the heights of the two wall surfaces from the ground are different; and determining a torque based on the difference.
Optionally, in an embodiment of the invention, the installation position of the concrete container along the axis of the drum satisfies the following condition: in the cylindrical part of the roller, in the cross section of the roller along the mounting position and in the direction vertical to the axis, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7.
Optionally, in an embodiment of the present invention, the angle θ between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees.
Optionally, in the embodiment of the present invention, the preset correspondence is determined based on the following: determining slump detection parameters corresponding to each sample in the concrete samples; and determining a preset corresponding relation based on the slump detection parameters and slump corresponding to each sample in the concrete samples.
The specific working principle and the benefits of the device for detecting the slump of the concrete in the stirring type engineering machinery provided by the embodiment of the invention are similar to those of the method for detecting the slump of the concrete in the stirring type engineering machinery provided by the embodiment of the invention, and the detailed description is omitted here.
In addition, another aspect of the embodiments of the present invention also provides a system for detecting slump of concrete in a stirring type construction machine, the system including: the apparatus described in the above embodiments; a concrete container installed on a drum of the agitation type construction machine for containing concrete; the angle detection module is used for detecting the rotating angle of the roller; the force detection module is used for detecting the difference of the pressures of the two wall surfaces of the concrete container, which are positioned on the opposite surfaces, due to the extrusion of the concrete in the rotating process of the roller; and/or the torque detection module is used for detecting the torque generated by pouring out the concrete in the concrete container in the rotation process of the roller.
Optionally, in the embodiment of the present invention, the torque detection module is detachably and fixedly connected to the metering connecting rod and the mounting plate, the mounting plate is fixedly connected to the manhole cover plate, and a preset distance is provided between the metering connecting rod and the manhole cover plate. Alternatively, the torque detection module may be a torque sensor.
In addition, another aspect of the embodiments of the present invention also provides an agitation type construction machine, which includes the system described in the above embodiments.
In addition, another aspect of the embodiments of the present invention also provides a machine-readable storage medium, which stores instructions for causing a machine to execute the method described in the above embodiments.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (16)
1. A method for detecting slump of concrete in a stirring type working machine, characterized by comprising:
judging whether the volume of concrete in a concrete container mounted on a drum of the stirring type engineering machine is changed from a first preset volume to a second preset volume along with the rotation of the drum;
determining a slump detection parameter corresponding to the concrete when the volume is changed from the first preset volume to the second preset volume, wherein the slump detection parameter is the time or angle of rotation of the roller when the volume is changed from the first preset volume to the second preset volume; and
and determining the slump of the concrete based on the determined slump detection parameters and preset corresponding relations, wherein the preset corresponding relations are the corresponding relations between the slump detection parameters and the slump.
2. The method of claim 1, wherein the determining whether the volume of concrete in a concrete containment vessel mounted on a drum of the stirred work machine changes from a first predetermined volume to a second predetermined volume as the drum rotates comprises:
acquiring torque generated by pouring out concrete in the concrete container in the rotation process of the roller; and
and judging whether the torque is changed from a first preset torque to a second preset torque, wherein the first preset torque corresponds to the first preset volume, and the second preset torque corresponds to the second preset volume.
3. The method of claim 2, wherein the torque obtained is determined based on:
acquiring the difference of pressures of two wall surfaces of the concrete container at opposite positions due to the extrusion of the concrete in the rotation process of the roller, wherein the two wall surfaces have different heights from the ground except the lowest position and the highest position of the roller in the rotation process of the roller; and
based on the difference, the torque is determined.
4. The method according to claim 1, characterized in that the installation position of the concrete container along the axis of the drum satisfies the following condition: in the cylindrical part of the roller, in the direction which passes through the installation position and is vertical to the axis in the section of the roller, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7.
5. The method according to claim 1, wherein the angle θ between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees.
6. The method according to any one of claims 1-5, wherein the preset correspondence is determined based on:
determining the slump detection parameter corresponding to each sample in the concrete samples; and
and determining the preset corresponding relation based on the slump detection parameters and the slump corresponding to each sample in the concrete samples.
7. An apparatus for detecting slump of concrete in a stirring type working machine, characterized by comprising:
the system comprises a judging module, a judging module and a control module, wherein the judging module is used for judging whether the volume of concrete in a concrete container installed on a roller of the stirring type engineering machinery is changed from a first preset volume to a second preset volume along with the rotation of the roller;
determining slump detection parameters, wherein the slump detection parameters are used for determining slump detection parameters corresponding to the concrete when the volume is changed from the first preset volume to the second preset volume, and the slump detection parameters are the rotating time or angle of the roller when the volume is changed from the first preset volume to the second preset volume; and
and the slump determination module is used for determining the slump of the concrete based on the determined slump detection parameters and the preset corresponding relation, wherein the preset corresponding relation is the corresponding relation between the slump detection parameters and the slump.
8. The apparatus of claim 7, wherein the determining module determines whether the volume of concrete in a concrete container mounted on a drum of the hybrid work machine changes from a first predetermined volume to a second predetermined volume as the drum rotates comprises:
acquiring torque generated by pouring out concrete in the concrete container in the rotation process of the roller; and
and judging whether the torque is changed from a first preset torque to a second preset torque, wherein the first preset torque corresponds to the first preset volume, and the second preset torque corresponds to the second preset volume.
9. The apparatus of claim 8, wherein the torque obtained is determined based on:
acquiring the difference of pressures of two wall surfaces of the concrete container at opposite positions due to the extrusion of the concrete in the rotation process of the roller, wherein the two wall surfaces have different heights from the ground except the lowest position and the highest position of the roller in the rotation process of the roller; and
based on the difference, the torque is determined.
10. The apparatus according to claim 7, wherein the installation position of the concrete container along the axis of the drum satisfies the following condition: in the cylindrical part of the roller, in the direction which passes through the installation position and is vertical to the axis in the section of the roller, the value range of the ratio m of the distance from the standing liquid level line of the concrete to the wall of the roller, which is in contact with the concrete, to the diameter of the roller is more than or equal to 0.3 and less than or equal to 0.7.
11. The apparatus according to claim 7, wherein the angle θ between the axis of the concrete container and the tangent of the circumference of the drum satisfies the following condition: theta is more than or equal to 45 degrees and less than or equal to 90 degrees.
12. The apparatus according to any one of claims 7-11, wherein the preset correspondence is determined based on:
determining the slump detection parameter corresponding to each sample in the concrete samples; and
and determining the preset corresponding relation based on the slump detection parameters and the slump corresponding to each sample in the concrete samples.
13. A system for detecting slump of concrete in a stirring type working machine, characterized by comprising:
the device of any one of claims 7-12;
a concrete container installed on a drum of the agitation type construction machine, for containing concrete;
the angle detection module is used for detecting the rotating angle of the roller; and
the force detection module is used for detecting the difference of the pressures of the two wall surfaces of the concrete container in opposite positions due to the extrusion of the concrete in the rotation process of the roller; and/or
And the torque detection module is used for detecting the torque generated by pouring out the concrete in the concrete container in the rotation process of the roller.
14. The system of claim 13, wherein the torque detection module is removably and fixedly connected to a metering link and a mounting plate, the mounting plate is fixedly connected to a manhole cover, and the metering link is spaced from the manhole cover by a predetermined distance.
15. A stirred working machine, characterized in that it comprises a system according to claim 13 or 14.
16. A machine-readable storage medium having stored thereon instructions for causing a machine to perform the method of any one of claims 1-6.
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| CN202010549979.3A CN111716539B (en) | 2020-06-16 | 2020-06-16 | Method, device and system for detecting slump and stirring type engineering machinery |
| PCT/CN2021/081045 WO2021253891A1 (en) | 2020-06-16 | 2021-03-16 | Method, device and system for detecting slump, and stirring-type engineering machine |
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| CN111716539B (en) * | 2020-06-16 | 2021-04-02 | 中联重科股份有限公司 | Method, device and system for detecting slump and stirring type engineering machinery |
| CN113681720B (en) * | 2021-09-01 | 2022-08-26 | 赖柯霓 | Intelligent monitoring method, system and device for concrete mixer truck |
| CN113899887A (en) * | 2021-10-12 | 2022-01-07 | 中建西部建设建材科学研究院有限公司 | Concrete workability time-varying test method and system based on driving torque |
| CN114895008A (en) * | 2022-05-25 | 2022-08-12 | 湖南三一快而居住宅工业有限公司 | Concrete slump determination method and system |
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| JPH01113661A (en) * | 1987-10-27 | 1989-05-02 | Maeda Corp | Estimating method for slump in concrete mixing |
| AUPN296495A0 (en) * | 1995-05-15 | 1995-06-08 | Boral Resources (Vic) Pty Limited | Concrete mixing |
| JP2000121531A (en) * | 1998-10-13 | 2000-04-28 | Asao Ishimaru | Method for automatically measuring slump of ready- mixed concrete during operation of mixer |
| CN2425364Y (en) * | 1999-10-19 | 2001-03-28 | 刘国强 | Concrete integrald tester |
| CA2555628C (en) * | 2004-02-13 | 2014-12-02 | Rs Solutions, Llc | Method and system for calculating and reporting slump in delivery vehicles |
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| WO2010110814A1 (en) * | 2009-03-27 | 2010-09-30 | Gr 2008 Llc | Slump flow monitoring |
| CN102944670B (en) * | 2012-11-28 | 2015-03-04 | 徐州徐工施维英机械有限公司 | Method and device for detecting concrete slump of premixed concrete of mixer truck |
| CN104589510B (en) * | 2014-12-26 | 2017-09-05 | 湖南万物工业软件有限公司 | Mixing plant slump control method and system |
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| CN109975529A (en) * | 2019-03-25 | 2019-07-05 | 上海申昆混凝土集团有限公司 | Slump automatic monitoring method and system in concrete production |
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| CN110426508B (en) * | 2019-08-21 | 2024-02-20 | 珠海春禾新材料研究院有限公司 | Slump adjusting device and slump adjusting method for ready-mixed concrete mixture |
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| CN111257170A (en) * | 2020-03-12 | 2020-06-09 | 王立伍 | Indirect observation method for solving slump change in concrete production process |
| CN111716539B (en) * | 2020-06-16 | 2021-04-02 | 中联重科股份有限公司 | Method, device and system for detecting slump and stirring type engineering machinery |
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Application publication date: 20200929 Assignee: Zoomlion Yuanjiang Branch Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY Co.,Ltd. Contract record no.: X2023980042766 Denomination of invention: Method, device, and system for detecting slump and agitating construction machinery Granted publication date: 20210402 License type: Common License Record date: 20231008 |