JP3682318B2 - Measuring method of raw concrete capacity in concrete hopper. - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for measuring the capacity of ready-mixed concrete in a concrete hopper of a ready-mixed concrete manufacturing plant that manufactures ready-mixed concrete.
[0002]
[Prior art]
In ready-mixed concrete manufacturing plants, batches are measured in batches according to the mix of ready-mixed concrete that produces various materials such as gravel, sand and other aggregates, cement, and water stored in the upper part of the plant body, and then sequentially into the mixer. The kneaded mixture is kneaded for a predetermined time, and once the kneading is completed, it is once dropped into a concrete hopper disposed at a lower level and stored, and then loaded into a mixer truck placed under the concrete hopper for shipment.
[0003]
At this time, when the ready-mixed concrete mixed by the mixer is discharged to the concrete hopper, the capacity of the ready-mixed ready concrete is confirmed. As described in Japanese Utility Model Laid-Open No. 2-64009, the capacity of the ready-mixed concrete is confirmed. There has been proposed a hopper that is supported by a load cell that is a weight detector, detects the weight of the ready-mixed concrete in the concrete hopper using the load cell, and uses a device that confirms the capacity of the ready-mixed concrete from the weight.
[0004]
[Problems to be solved by the invention]
However, as described above, when a load cell is adopted in the capacity confirmation device for ready-mixed concrete, the load cell is expensive, and the cost of the device is high.
[0005]
An object of this invention is to provide the raw concrete capacity | capacitance measuring method in the concrete hopper which can confirm the capacity | capacitance of fresh concrete at low cost in view of said point.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention arranges a distance sensor above a concrete hopper having a substantially inverted conical shape, and sets a plurality of reference points at predetermined intervals in the depth direction of the concrete hopper. For each reference point, the distance from the distance sensor to the reference point and the amount of flooding of the concrete hopper at the reference point are stored and set, and during actual measurement, the distance sensor determines the distance between the upper surface of the ready-mixed concrete and the distance sensor. The actual measurement distance is measured and two reference points located immediately before and after the actual measurement distance are selected from the reference points, and the distances (X1, X2) from the distance sensor at these reference points are A linear function of Y = AX + B is obtained from the amount of water (Y1, Y2), and the actual measured distance (X) is substituted into this linear function to submerge the concrete hopper at the actual measured distance (Y). Calculated, it is characterized in that the flooding water was such that the fresh concrete volume.
[0007]
[Action]
According to the raw concrete capacity measuring method of the present invention, when measuring the capacity of ready-mixed concrete stored in the concrete hopper, when the ready-mixed concrete is discharged into the concrete hopper, the distance sensor and the distance sensor disposed above the concrete hopper The distance to the surface of the ready-mixed concrete in the concrete hopper is measured to obtain the actual measurement distance.
[0008]
Then, two reference points located before and after the actual measurement distance are selected from a plurality of reference points set at predetermined intervals along the depth direction of the concrete hopper, and the distances from the respective distance sensors of the reference points A linear function is derived from the amount of flooding of the concrete hopper, and the distance between the two selected reference points is regarded as a straight line, and the actual measurement distance is substituted into the linear function to complement the selected two reference points. Thus, the amount of flooding of the concrete hopper at the actual measurement distance is obtained. The amount of flooded water thus obtained is taken as the capacity of ready-mixed concrete at the actual measurement distance.
[0009]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
Reference numeral 1 denotes a biaxial mixer mounted on a ready-mixed concrete manufacturing plant for manufacturing ready-mixed concrete. Arms are fixed radially to two parallel kneading shafts in a radial direction, and a mixing blade is attached to the tip of the arm. The concrete material is kneaded by driving and rotating the kneading shaft in opposite directions by a drive motor.
[0011]
A concrete hopper 2 for temporarily storing ready-mixed concrete dropped from the mixer 1 is disposed below the mixer 1, and a flexible cylindrical gate 3 is attached to the lower portion of the concrete hopper 2. The concrete in the hopper is dispensed by opening and closing.
[0012]
4 is a raw concrete capacity measuring device that measures the capacity of the ready-mixed concrete in the concrete hopper 2, and includes a control unit 5, a storage unit 6, an input unit 7, and a display unit 8. The distance sensor 9 disposed in the is connected.
[0013]
The distance sensor 9 includes various distance sensors such as an ultrasonic distance sensor using ultrasonic waves and a laser distance sensor using laser light, and can be appropriately selected depending on the scale of the plant, the arrangement of equipment, and the like.
[0014]
Next, the procedure for obtaining the volume of ready-mixed concrete in the concrete hopper will be described based on the flowchart of FIG.
[0015]
First, as an initial setting, a plurality of reference points are set at predetermined intervals along the depth direction for the concrete hopper 2 (S1). For example, eight reference points a, b, c, d, e, f, g, and h are employed at substantially equal intervals in FIG. 1, but these reference points may be appropriately determined according to the shape of the hopper. The distance (X1, X2... Xn) between the distance sensor 9 and the reference point and the amount of flooding (Y1, Y2... Yn) of the concrete hopper 2 at the reference point are calculated for each reference point. Data as shown in the graph is created, and the distance and the flooding amount are input and stored in the storage unit 6 of the raw-capacity measuring device via the input unit 7 for each reference point (S2). It is determined whether or not the data input is completed (S3). If it is completed, the process proceeds to END. If not completed, the process returns to (S2) and the data input is continued.
[0016]
Next, when the operation is started and the ready-mixed concrete is dropped into the concrete hopper 2, the distance sensor 9 measures the distance from the distance sensor 9 to the surface of the ready-mixed concrete to obtain an actual measurement distance (S4). Then, from the plurality of reference points stored in the storage unit 6 in advance, the reference points located at the front and back closest to the actual measurement distance are read from the two-point storage unit (S5). A linear function of Y = AX + B is obtained from the distance data (X1, X2) of the two reference points and the flooding data (Y1, Y2) as follows (S6).
[0017]
Y1 = AX1 + B (1)
Y2 = AX2 + B (2)
The simultaneous equations of the equations (1) and (2) are solved to obtain the coefficients A and B to obtain the following equations.
Y = AX + B (3)
A = (X1 * Y2-X2 * Y1) / (X1-X2) (4)
B = (Y1-Y2) / (X1-X2) (5)
The actual measurement distance is substituted into X of the linear function Y = AX + B thus determined (S7), and the flooding amount Y of the concrete hopper 2 is determined (S8). That is, the distance between the two reference points is regarded as a straight line, and the amount between the two points is complemented to estimate the amount of flooding at the actual measurement distance. The obtained flooded amount Y is defined as the capacity of ready-mixed concrete stored in the concrete hopper.
[0018]
When the capacity measurement is finished, it is determined whether or not the flow is finished (S9). When the capacity measurement is continued, the process returns to S4 to measure the distance between the surface of the ready-mixed concrete and the distance sensor by the distance sensor. If the steps are repeated and the process ends, the process proceeds to END and ends.
[0019]
【The invention's effect】
As described above, in the raw-con capacity measuring method according to the present invention, the distance sensor 9 is disposed above the concrete hopper 2 and a plurality of references are provided at predetermined intervals along the depth direction of the concrete hopper 2 in advance. A point is set, and two reference points at the front and rear positions closest to the actual measurement distance from the distance sensor 9 measured by the distance sensor 9 to the surface of the ready-mixed concrete are selected, and the distance from the distance sensor 9 at these two reference points is selected. Since a linear function is obtained from the distance and the amount of flooding, and the actual measurement distance is substituted into the linear function to obtain the flooding amount of the concrete hopper 2 corresponding to the actual measurement distance, it is expensive as in the conventional example. The capacity of ready-mixed concrete can be obtained without using a load cell, and the cost can be reduced as compared with a method using a load cell.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a concrete hopper of a ready-mixed concrete manufacturing plant that employs a ready-con capacity measuring method of the present invention.
FIG. 2 is a graph showing the relationship between the distance from a distance sensor at a reference point and the amount of flooding.
FIG. 3 is a flowchart showing a procedure of a method for measuring a capacity of a raw control according to the present invention.
[Explanation of symbols]
2 ... Concrete hopper 4 ... Conveyor capacity measuring device 9 ... Distance sensor

Claims (1)

A distance sensor is arranged above the concrete hopper having a substantially inverted conical shape, and a plurality of reference points are set in advance at predetermined intervals along the depth direction of the concrete hopper. The distance to the point and the amount of flooding of the concrete hopper at the reference point are memorized and set. Among them, two reference points located immediately before and after the actual measurement distance are selected, and Y = AX + B from the distance (X1, X2) and the amount of flooding (Y1, Y2) from the distance sensor at these reference points. A linear function is obtained, and the actual measurement distance (X) is substituted into the linear function to calculate the amount of flooding (Y) of the concrete hopper at the actual measurement distance. Ready-mixed concrete capacity measuring method in the concrete hopper, characterized in that as.

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