JP2008096409A - Content amount measuring method and measuring device for freshly mixed concrete conveyance vehicle drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a measuring method and a measuring device capable of measuring a content amount in a drum of a freshly mixed concrete conveyance vehicle, simple/quickly correctly/inexpensively. <P>SOLUTION: The one edge of a measurement rod 5 is slidably contact-supported by the two points A and B, that is, A point consisting of a rear end of a hopper 4 of the freshly mixed concrete conveyance vehicle 1, and B point consisting of a measuring auxiliary device added to the hopper 4. A liquid level of the freshly mixed concrete 6 in the drum 2 is contacted in C point consisting of the other edge of the measuring rod 5. The amount of the freshly mixed concrete 6 is measured by the distance between A point or B point as the measuring points established on the hopper 4 and C point of the other edge of the measuring rod 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for easily and rapidly measuring the amount of ready-mixed concrete or mortar that is the contents in a drum of a ready-mixed concrete transport vehicle called a concrete mixer truck, an agitator truck, a ready-mixed truck, and the like. .

  In addition to the above, ready-mixed concrete transport vehicles are sometimes called agitators, mixer trucks, mobile mixers, etc. Strictly speaking, materials such as cement and aggregate are loaded into a drum and mixed together to prepare ready-mixed concrete. The one that manufactures and transports mortar is called a mixer truck, etc., while the one that mixes and transports ready-mixed concrete and mortar that is pre-manufactured in a factory, etc., is called an agitator. Many are also used.

The ready-mixed concrete transport truck that has finished delivering the contents at the construction site, etc., returns to the factory or base for cleaning, but the contents that remain in the drum without being used up at the site will be sent to the site for environmental protection. Instead of being discarded or left unattended, they are taken back to factories and bases for disposal or recycling as aggregates.
The contents that remain in the drum without being used up are commonly called as “remaining condenser”, “returning condenser”, “remaining condenser”, etc., and the disposal process also has a corresponding processing cost. It is carried out as part of the work or as a free service, and the actual processing cost is borne by the provider.

In recent years, however, negotiations and efforts have been made to allow customers to pay a reasonable share of the cost of processing for the purpose of reducing waste.
However, this processing cost is incurred according to the amount of content to be processed, and it is necessary for the provider and customer to check and understand the amount of content remaining in the drum at the site. As shown in FIG. 5, there is no method other than looking into the inside of the drum 2 of the ready-mixed concrete conveyance vehicle 1 from the hopper 4, and a spiral stirring blade is provided inside the drum 2 as shown in FIG. There is a problem that it is very difficult to measure the amount of the contents accurately by visual inspection. In fact, the provider is a weak driver and the customer is often a strong field supervisor, so an objective measurement method is required.
In addition, accurate measurement is almost impossible simply by visual observation in the first place, and various mechanical, electrical, or optical methods are conceivable for sufficiently accurate measurement. It is necessary to pay a certain amount of money to equip a highly durable measuring device that can function reliably and measure the inside of the drum, where the high-viscosity contents, including hard aggregate, flow and adhere violently. There was also a problem of becoming.

  The present invention has been made in view of such a situation, and provides a measuring method and a measuring instrument that can measure the amount of contents in a drum of a ready-mixed concrete vehicle simply, quickly, accurately, and inexpensively. The issue is to provide.

In order to solve the problems as described above, the content measuring method of the ready-mixed concrete transport drum of the present invention is to measure the amount of the content by inserting a linear measuring instrument into the drum from the hopper of the ready-mixed concrete transport vehicle. Therefore, the support point for fixing the linear measuring instrument and the measurement point for measuring the scale are set on the hopper, and the measurement point and the liquid level of the contents are in contact with each other. The amount of contents in the drum is measured by measuring the distance from the tip of the linear measuring instrument.
Moreover, the measurement auxiliary tool which is the measurement instrument of the present invention is configured to set the above-mentioned support points and measurement points in a detachable manner with respect to the hopper, while the linear measuring instrument is a bar or plate having a scale. It is basically configured by a long member having a shape, and can be further shortened as a telescopic type or a folding type as required.
The measurement auxiliary tool and the linear measuring instrument are further provided with a lighting device for measurement work and a level for confirming the horizontal state of the ready-mixed concrete transport vehicle.

By adopting such a configuration, the present invention can measure the amount of contents in the drum of the ready-mixed concrete transport vehicle simply, quickly, accurately, and inexpensively.
In other words, there is no other way to look inside the drum than looking into the inside of the hopper, but the amount of contents in the drum was very difficult to measure accurately by visual inspection because of the spiral stirring blades. Can be measured easily and accurately with a simple measuring instrument such as a linear measuring instrument or a measuring aid from the hopper.

  FIG. 1 is a schematic cross-sectional view for explaining an embodiment of the present invention. A measuring rod 5 as a linear measuring instrument is inserted into a drum 2 from a hopper 4 to measure the amount of ready-mixed concrete 6 as a content. The basics of the measuring method are schematically shown. That is, one end portion of the measuring rod 5 is slidably contacted and supported at two points, point A at the rear end portion of the hopper 4 and point B of the measurement auxiliary tool 7 attached to the hopper 4. 5 is brought into contact with the liquid level of the ready-mixed concrete 6 in the drum 2, and the distance between the point A or B, which is a measurement point set on the hopper 4, and the tip C of the measuring bar 5. Is measured with a measuring rod 5 to measure the amount of ready-mixed concrete 6.

Here, the points A and B are measurements for reading and measuring the support points and scales of the measuring bar 5 that slidably contact and support the measuring bar 5 in the hopper 4 and always fixed at a predetermined position. It is a point. If necessary, it is possible to set several more support points or separate measurement points on the straight line including the point A and the point B. In addition to the point contact support at the support point, a line contact support can be used. It is also preferable to improve the slidability and linearity of the measuring rod 5 as a shape or a cylinder.
In addition to setting the support point and the measurement point using the rear end portion of the hopper 4 or the measurement auxiliary tool 7 as in this example, one or more appropriate parts of the hopper 4 may be used. It is possible to set by using one or a plurality of various measurement assisting tools described later, or it is possible to configure a predetermined support point or a part to be a measurement point in the hopper 4 in advance.

  At the time of measurement, depending on the position of the stirring blade 3, the liquid level of the ready-mixed concrete 6 may not be a single horizontal plane, so the drum 2 is rotated forward and the rotation is stopped where the liquid level is maintained at a single horizontal plane. And measure the amount of contents. Here, forward rotation is rotation during transportation (clockwise when viewed from the front of the vehicle), and reverse rotation is unloading rotation (counterclockwise when viewed from the front of the vehicle).

The relationship between the increase / decrease in the amount of contents in the drum 2 and the displacement of the liquid level is not a linear proportional relationship because of the shape characteristics of the drum 2, but has a relatively abrupt discontinuity. In the measuring method of the present invention, since the measuring bar is not perpendicular to the liquid level but has a large tilt angle θ, the amount of contents can be measured with high accuracy.
That is, for example, when the amount of the contents increases, the height position of the liquid level slightly rises compared to the increase of the contents amount, but the position of the contact point between the tip C of the measuring rod 5 and the liquid level. Will recede greatly compared to the upward displacement of the liquid level, and by reading this large backward displacement, the slight upward displacement of the liquid level can be greatly enlarged and measured, so the amount of content can be measured with high accuracy. It can be measured.

FIG. 2 shows the results of an experiment in which actual measurement was performed by the measurement method of the present invention. (A) is a numerical table, and (b) is a graph of numerical values. In the experiment, in an ordinary concrete mixer truck (nominal 11 ton car / maximum drum capacity 8.9 m ³ ), raw concrete was put into an empty drum in 0.5 m ³ increments, and the points B and C shown in FIG. The distance is measured with a measuring bar of mm scale.
As a result of the experiment, a sufficiently large value was observed for each difference (mm). Furthermore, as indicated by the graph line, almost no discontinuity was observed, and a substantially linear characteristic was observed.

  Therefore, when measuring the content of the drum in this concrete mixer truck, it is possible to specify the amount of the content by comparing with the measurement result using the numerical table of (a) above. In addition, as described above, each difference has a sufficiently large value and has a substantially linear characteristic. Therefore, even when the measurement result shows an intermediate value, the amount of contents is specified in an appropriate manner. It is also possible to do.

  In actual use, each concrete mixer truck has its own unique characteristics. For strict operation, it is preferable to create and use a numerical table specific to each concrete mixer. It is also preferable to use a common numerical table and a common measuring instrument for the same specification, type, drum shape and capacity.

Each of (c), (d), (e), (f), and (g) in FIG. 3 is a perspective view showing an embodiment of a measurement aid that is a measurement instrument of the present invention.
(C) is an overall plate-shaped measuring aid 7, which has a folded portion 8 as an upper hook for detachably hanging on the upper end edge of the hopper 4 at the upper portion, and a measuring rod 5 at the lower portion. And a through-hole 9 serving as a measurement point B is provided. (D) is a U-shaped measurement auxiliary tool 10 as a whole, with an upper portion provided with a folded portion 11 as an upper hook that detachably hangs itself on the upper edge of the hopper 4, and a measuring rod at the lower portion. 5 is mounted and slidably supported, and has a curved portion 12 as a lower hook serving as a measurement point B. (E) is a measurement aid 13 that is linear in its entirety, and has an upper portion with a folded portion 14 as an upper hook that detachably hangs itself on the upper edge of the hopper 4, and a measuring rod 5 at the lower portion. And a curved portion 15 serving as a lower hook serving as a measurement point B is provided.
If there is a scattering prevention rubber hood for receiving ready-mixed concrete at the upper edge of the hopper 4 and the measurement auxiliary members 7, 10, 13 etc. cannot be hung, the measurement auxiliary member is hung at an appropriate position on the hopper 4. For example, it is also preferable to attach a substantially U-shaped bracket (g) or the like for lowering in advance. Furthermore, the structure in which the measurement auxiliary member is hung on the hopper 4 can be variously changed using a general known technique.
Further, (f) is a measurement auxiliary tool 16 having a triangular prism shape as a whole, having a bottom surface portion 17 for detachably placing itself inside the hopper 4 at the lower portion, and placing the measuring rod 5 on the upper portion. And a slidable concave portion 18 serving as a measurement point B. The triangular prism-shaped measurement auxiliary tool 16 is used by being positioned at the lower end edge of the back portion of the hopper 4 as shown by a dotted line in FIG.
As described above, the measurement auxiliary tool of the present invention is detachably attached to the hopper 4 to slidably abut one end of a linear measuring instrument such as the measuring bar 5 and to serve as a measuring point. As long as it can be obtained, not only these examples but also various shapes and structures can be considered, and it corresponds to various hoppers and drum shapes or various measurement work conditions. A simple configuration is also preferable.

Each of (h) and (i) in FIG. 4 is a perspective view showing an embodiment of a linear measuring instrument which is a measuring instrument used in the present invention.
The linear measuring instrument used for measuring in the present invention is basically a rod-like or plate-like linear long member having a scale for measuring like the measuring rod 5, but is necessary. Depending on the length of the measuring rod 19 as shown in (h), or as a measuring rod 21 as shown in (i), it is foldable so that it can be conveniently stored and carried when not in use. It is also preferable to make it flexible.
The measuring rod 19 is a so-called rod antenna structure that is extendable and retractable, and is preferable because it has high rigidity and linearity, and is robust. The measuring rod 21 can be folded by a hinge, This is preferable because a light and inexpensive material such as plate-like wood having a good linearity can be manufactured relatively easily. In addition, a spherical object 20 is provided at the tip of the measuring rod to make it easy to confirm a contact point with a liquid surface such as ready-mixed concrete, or a surface including the tip is provided with a notch 22 to form a surface of the measuring rod. It is also preferable to prevent the tip from sinking below the liquid level.

Furthermore, the convenience in measurement can be further improved by providing the linear measuring instrument or the measurement auxiliary tool used in the present invention with a lighting instrument or a leveler (not shown).
The inside of the ready-mixed concrete transport drum is dark, and when the amount of contents is small, the position of the liquid surface that contacts the tip of the measuring rod is deeper and darker. When a lighting device is provided, the inside of the drum and the hand can be illuminated brightly, which is extremely useful in measurement work.
Also, in order to accurately measure the amount of content in the drum, the ready-mixed concrete transporter should be kept horizontal, but most construction sites are not leveled. If the tool is equipped with a level, the level of the ready-mixed concrete transporter can be easily checked, which is extremely useful in measurement work.
In addition, a lighting device, a level device, etc. can use a commercially available thing, The attachment method is also possible with a general method sufficiently.

As described above, the content amount measuring method and measuring instrument for the ready-mixed concrete transport drum of the present invention can be measured very simply, quickly, accurately, and inexpensively.
Also, in the experimental results of actual measurements, very good numerical values and characteristics are seen, and they are sufficiently practical.
Today, when the protection of the environment is screaming loudly, the contents of the unfinished ready-mixed concrete transport drums have begun to be dealt with appropriately and appropriately in terms of cost. Further progress can be expected by establishing a simple, rapid, accurate and inexpensive method for measuring quantities.

  Schematic sectional view showing an embodiment of the present invention   Numerical table (a) and graph (b) showing experimental results of the present invention   The perspective view which shows Example (c) (d) (e) (f) (g) of the measurement auxiliary tool of this invention   The perspective view which shows Example (h) (i) of the linear measuring instrument used by this invention   Side view showing a typical ready-mixed concrete transport vehicle   The schematic perspective view which shows the drum inside of the ready-mixed concrete conveyance vehicle shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ready-mixed concrete east 2 Drum 4 Hopper 6 Ready-mixed concrete 5 Measuring rod 7, 10, 13, 16 Measuring aid 19, 21 Linear measuring instrument

Claims (6)

  A method for measuring the amount of content in a drum of a ready-mixed concrete transport vehicle, wherein one end of a linear measuring instrument is slidably abutted and supported at at least two points set on a hopper to detect linearity. Contact the tip of the other end of the measuring instrument to the liquid surface of the contents, and measure the distance between the measurement point set on the hopper and the tip of the other end of the linear measuring instrument using the linear measuring instrument. A method for measuring the amount of content of a ready-mixed concrete transport vehicle drum, which measures the amount of content in the drum.   2. The at least two points set on the hopper include one point on the hopper rear end and one point provided on a measurement auxiliary tool added to the hopper, and one of these two points is used as a measurement point. The method for measuring the amount of content of a ready-mixed concrete transport drum as described in 1.   A measuring instrument used in the method for measuring the amount of contents of a ready-mixed concrete transport drum according to claim 1 or 2, wherein one end of a linear measuring instrument is slidably contacted and supported. A measuring aid having a point and detachably attached to the hopper.   The measurement auxiliary tool according to claim 3, wherein the measurement auxiliary tool has an upper hook that hangs itself on the hopper, and a lower hook or a through hole that abuts and supports the linear measuring instrument.   It is a measuring instrument used for the content amount measuring method of the ready-mixed concrete conveyance vehicle drum in any one of Claim 1 or Claim 2, Comprising: It is comprised with the rod-shaped or plate-shaped elongate member provided with the scale for measurement. A linear measuring instrument which can be further shortened as an extendable or foldable type as required.   The measuring instrument according to any one of claims 3 to 5, further comprising a lighting instrument for measuring work and / or a level for confirming a horizontal state of the ready-mixed concrete transport vehicle. .

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