JP7252064B2 - Slump measuring machine and slump measuring method - Google Patents

Description

The present invention relates to a slump measuring machine and a slump measuring method.

In the slump management of ready-mixed concrete, the slump value (slump) is usually measured by the JIS method (eg, JIS A 1108:2005). In this slump measurement, an error may occur for each individual or measurement, and skill is required for highly accurate slump measurement. In particular, the ready-mixed concrete used in the slip form method, which requires the placed ready-mixed concrete to stand on its own, has a large maximum particle size of, for example, 40 mm. For this reason, errors are likely to occur. Slump management is important, but slump measurement requires skill and measurement time. In addition, at present, slump management at the time of arrival of ready-mixed concrete at the site is performed only once in the morning and once in the afternoon.

The slump value of ready-mixed concrete is very sensitive to changes in the surface water of fine aggregate. Surface water management of this fine aggregate is carried out in two ways. In the first method, in a plant with two or more fine aggregate stockyards, the fine aggregate to be used in ready-mixed concrete to be shipped on the same day is received by the day before, and the surface water of the fine aggregate is stabilized before use. do. In the second method, the surface water of the fine aggregate is automatically measured in real time at the plant and the surface water of the fine aggregate is managed. Although such management is performed, slump measurement for the agitator vehicle that actually arrives at the site may result in large variations in the slump value. In particular, in the slipform method, slump management is important not only to keep the slump value within the allowable range, but also to suppress variations in the slump value.

JP-A-2000-121531

The problem to be solved by the present invention is to provide a slump measuring instrument and a slump measuring method that can easily perform highly accurate slump measurement.

A slump measuring instrument according to an embodiment of the present invention comprises a main body formed to be portable, a motor provided in the main body, a rotating shaft provided in the main body and rotated by driving the motor, and the rotating shaft. A current value of the motor which is grasped as a resistance value which is a resistance value received from the ready-mixed concrete by a plurality of blades arranged in the circumferential direction of the rotating shaft and the plurality of blades rotating in the ready-mixed concrete and a measuring unit for measuring, wherein the tip end of the rotating shaft of each of the plurality of blades is separated from the tip of the rotating shaft by at least the longest crushed stone size in the ready-mixed concrete. It is characterized by being provided at a position .

In the above slump measuring machine, each of the plurality of blades may be formed in a plate shape, and each plane may be provided so as to be parallel to the extending direction of the rotating shaft.

In the slump measuring machine, each of the plurality of blades is formed in a plate shape, and each plane is inclined in the circumferential direction of the rotating shaft at an angle of 30 degrees or less with respect to the extending direction of the rotating shaft. It may be provided.

In the above slump measuring machine, the number of the plurality of blades may be 2 or more and 6 or less, and the plurality of blades may be arranged at equal intervals in the circumferential direction of the rotating shaft.

The slump measuring machine may include a display section for displaying the current value of the motor measured by the measuring section.

With respect to the slump measuring machine, a storage unit for storing data indicating the correlation between the resistance value and the slump value; An acquisition unit that obtains the slump value may be provided.

The slump measuring machine may include a display section for displaying the slump value acquired by the acquisition section.

In the above slump measuring machine, the measuring section may be provided in the main body.

A slump measuring method according to an embodiment of the present invention includes a main body formed to be portable, a motor provided in the main body, a rotating shaft provided in the main body and rotated by driving the motor, and the rotating shaft. and having a plurality of blades arranged in the circumferential direction of the rotating shaft, and the plurality of blades having an end on the tip side of the rotating shaft and a tip of the rotating shaft of each blade are connected to the ready-mixed concrete A slump measuring method for measuring a slump value by using a slump measuring machine provided at a position separated by at least the longest size of the crushed stone that is the largest in the fresh concrete, wherein the plurality of blades rotating in the fresh concrete are connected to the fresh concrete a step of measuring, by a measuring unit, the current value of the motor, which is grasped as a resistance value that is the value of the resistance received from the motor; and obtaining a slump value from the resistance value.

According to the embodiment of the present invention, highly accurate slump measurement can be easily performed.

1 is a diagram showing a schematic configuration of a slump measuring machine according to an embodiment; FIG. FIG. 4 is a diagram for explaining slump measurement according to an embodiment; 4 is a graph showing a relationship between a motor current value and a slump value according to one embodiment; It is a figure for demonstrating the angle of the blade|wing with respect to the rotating shaft which concerns on one Embodiment. It is a figure for demonstrating the separation distance of the front-end|tip of the rotating shaft and the lower end of a blade|wing which concern on one Embodiment. It is a figure for demonstrating the diameter of the blade|wing which concerns on one Embodiment. It is a figure for demonstrating the number of blade|wings and arrangement|positioning which concern on one Embodiment.

<One form of implementation>
An embodiment will be described with reference to the drawings.

(basic configuration)
As shown in FIG. 1, a slump measuring machine 10 according to the first embodiment includes a main body 20, a motor 30, a rotating shaft 40, a plurality of blades 50, an input section 60, a mounting section 70, a measuring A unit 80 is provided. This slump measuring machine 10 is formed so that a measurer (user) can carry it alone, that is, it is portable.

The main body 20 has a cylindrical portion 21 and a grip portion 22 . The cylindrical portion 21 is formed in a hollow cylindrical shape, and accommodates the motor 30 and a part of the rotating shaft 40 in its interior. The grip part 22 is formed in a shape that can be easily gripped by the measurer, and is provided near the center of the cylindrical part 21 . This grip part 22 is grasped by the measurer, and the main body 20, that is, the slump measuring machine 10 is held and carried.

The motor 30 is provided inside the cylindrical portion 21 and is electrically connected to the measurement unit 80 via wiring 11 such as electric wires and cables. A DC motor, for example, is used as the motor 30 . The motor 30 has a close relationship with its torque, rotation speed, current value, and the like. As the load torque applied to the motor 30 increases, the rotation speed of the motor 30 decreases and the current value of the motor 30 increases. That is, the rotation speed of the motor 30 is inversely proportional to the load torque, and the current value of the motor 30 is proportional to the load torque.

The rotating shaft 40 is formed in a columnar shape (a columnar bar shape), and one end thereof is connected to the motor 30 . The rotating shaft 40 is driven by the motor 30 to rotate about the axis of the rotating shaft 40 in the circumferential direction of the rotating shaft 40 . The lower end of the rotating shaft 40 (in FIG. 1) is the leading end, and the upper end of the rotating shaft 40 (in FIG. 1) is the trailing end.

The blades 50 are provided on the peripheral surface of the rotating shaft 40 so as to be arranged at equal intervals in the circumferential direction (circumferential direction) of the rotating shaft 40, for example, three (three blades), that is, every 120 degrees. These blades 50 are each formed of a fan-shaped plate material, and are provided so that their planes are parallel to the extending direction of the rotating shaft 40 . Each blade 50 rotates and moves in the circumferential direction (around the axis) of the rotating shaft 40 according to the rotation of the rotating shaft 40 .

The input portion 60 is provided on the outer peripheral surface of the grip portion 22 on the cylindrical portion 21 side, that is, at the base of the grip portion 22 . The input section 60 receives input operations from the measurer, and is electrically connected to the measurement unit 80 via the wiring 11 . For example, a push switch is used as the input unit 60 . A signal is input to the measurement unit 80 when the input section 60 is operated by the subject. When this signal is input, the motor 30 is driven (ON), and when the signal is no longer input, the motor 30 is stopped (OFF).

The mounting portion 70 has a curved plate 71 and a plurality of fixing members 72 . The attachment portion 70 is a member for attaching the measurement unit 80 to the main body 20 . The curved plate 71 is bent in the middle and formed into an L shape. The extending portion 71 a of the curved plate 71 is fixed to the outer peripheral surface of the main body 20 on the upper end side (in FIG. 1) by fixing members 72 . A measuring unit 80 is provided on the bent portion 71 b of the curved plate 71 . Each fixing member 72 is a member that fixes the curved plate 71 to the cylindrical portion 21 of the main body 20 . U-bolts, for example, are used as these fixing members 72 .

The measurement unit 80 has a control section 81 , a measurement section 82 and a display section 83 . The measurement unit 80 is electrically connected to a power supply (not shown) via wiring 12 such as electric wires and cables, receives power supply from the power supply, and supplies power to the motor 30 . For example, a generator, a battery, or the like is used as the power source, and a storage battery (secondary battery), an assembled battery, or the like is used as the battery.

The control unit 81 has a microcomputer (not shown) that centrally controls each unit, a storage unit (not shown) that stores processing information, various programs, and the like. This control section 81 controls each section such as the motor 30 , the measurement section 82 , the display section 83 and the like based on various information and various programs, and receives input signals from the input section 60 . The control unit 81 controls driving (ON, OFF) of the motor 30 according to input signals (ON, OFF signals) from the input unit 60 .

The measurement unit 82 measures the current value and voltage value of the motor 30 and transmits the measured current value and voltage value to the control unit 81 . The measurement unit 82 also calculates a power value (power) and a power amount (energy) using the measured current value and voltage value, and transmits the calculated power value and power amount to the control unit 81 . A voltammeter, for example, is used as the measuring unit 82 .

The display unit 83 displays the current value, voltage value, power value, power amount, etc. of the motor 30 according to the control by the control unit 81 . The control unit 81 controls the display unit 83 to display the voltage value, current value, power value, and power amount transmitted from the measurement unit 82 . As the display unit 83, for example, a liquid crystal display (black and white, color, etc.) is used.

(slump measurement)
Next, the flow of slump measurement by the slump measuring machine 10 will be described with reference to FIGS. 2 and 3. FIG.

The material (ready-mixed concrete) is transported to the site by an agitator vehicle. At the site, the agitator wheel is stopped, the material is stirred at high speed for 1 minute, and one unicycle's worth of material is extracted into a unicycle (for example, a deep unicycle). In the slump measurement, master data (master curve) is obtained in advance, and a slump value (slump) is obtained from the master data and the measured current value of the motor 30 . The master data is data indicating the correlation between the current value of the motor 30 and the slump value (see FIG. 3).

As shown in FIG. 2, first, a part of the rotating shaft 40 and each blade 50 are inserted into the ready-mixed concrete in the unicycle by the measurer (the upper part of each blade 50 is, for example, 5 cm or more thick in ready-mixed concrete. exists). When the user operates the input unit 60 in this inserted state, a predetermined constant voltage (for example, rated voltage) is applied to the motor 30 to drive the motor 30 . This predetermined voltage is preset. When the motor 30 drives and rotates, the rotating shaft 40 and each blade 50 also rotate. In addition, before a part of the rotating shaft 40 and each blade 50 are inserted into the ready-mixed concrete in the unicycle, the input unit 60 is operated by the measurer to drive the motor 30, and the rotating shaft 40 and each blade 50 It may be rotating, and the timing of starting rotation is not particularly limited.

When a part of the rotating shaft 40 and each blade 50 rotate in the fresh concrete, the fresh concrete around each blade 50 prevents the rotation of each blade 50, so each rotating blade 50 receives resistance from the fresh concrete, and each blade 50 rotates. A load is applied to the blades 50 and the rotating shaft 40 to prevent their rotation. The current value and voltage value of the motor 30 are constantly measured by the measurement unit 82 , and the current value and voltage value, power value and power amount are displayed by the display unit 83 . The measurer visually confirms the current value (stable current value) of the motor 30 displayed on the display unit 83 while each blade 50 is rotating in the ready-mixed concrete, and records it using a portable terminal or writing utensil. . In addition, a skilled worker takes ready-mixed concrete out of the unicycle and performs slump measurement according to the JIS method (eg, JIS A 1108:2005). The measurer records the slump value according to the JIS method in association with the current value of the motor 30 recorded as described above.

Next, the measurer changes the water content of the ready-mixed concrete in the unicycle, measures the current value of the motor 30 and the slump value according to the JIS method in the same manner as described above, and records the measured current value and slump value in association with each other. Such adjustment of the water content, measurement of the current value of the motor 30, and measurement of the slump value according to the JIS method are repeated, and the current value of the motor 30 and the slump value according to the JIS method are associated with each other a plurality of times (5 in FIG. 3). times) are recorded. An exponential regression formula is then used to generate master data indicating the correlation between the current value of the motor 30 and the slump value, as shown in FIG. In FIG. 3, graph A is a graph for ready-mixed concrete used in construction A, and graph B is a graph for ready-mixed concrete used in construction B. In FIG. The ready-mixed concrete for construction A and the ready-mixed concrete for construction B differ in the composition of cement, aggregate, and the like. In graphs A and B, R ² (coefficient of determination) is 0.9 or more, and a high correlation is obtained.

As shown in graphs A and B, the correlation between the current value of the motor 30 and the slump value varies depending on the mix of ready-mixed concrete, so it is necessary to create a master curve for each mix of ready-mixed concrete. However, if the mixture of ready-mixed concrete is the same, once a master curve is created at the plant, site, or indoor test site on the first day of the site, the slump value of all trucks can be calculated for slump management at the site. can be easily managed.

Next, in the slump measurement after the master curve is generated, a portion of the rotating shaft 40 and each blade 50 are inserted into the ready-mixed concrete in the unicycle by the measurer at the site as described above, and the input unit 60 is input by the measurer. manipulated. In this inserted state, a predetermined constant voltage (for example, rated voltage) is applied to the motor 30, and when the motor 30 is driven, the rotating shaft 40 and each blade 50 rotate. A current value of the motor 30 is constantly measured by the measurement unit 82 and displayed by the display unit 83 . The measurer visually confirms the current value (stable current value) of the motor 30 displayed on the display unit 83 while each blade 50 is rotating in ready-mixed concrete, and records it using a mobile terminal, writing utensil, or the like. Also, a slump value is obtained from the recorded current value of the motor 30 and the master data and recorded. For example, for slump management in the slipform method, the target slump value is 4 cm and the allowable range is within ±1 cm. If the obtained slump value (estimated slump value) is 2.5 cm, which is out of the allowable range, and the ready-mixed concrete is expected to be rather hard, insufficient mortar floating on the surface is confirmed at the placement site. rice field.

According to the slump measurement described above, the current value of the motor 30 is measured while a portion of the rotating shaft 40 and each blade 50 are in ready-mixed concrete and are rotated by the driving of the motor 30 . Then, the slump value is obtained from the measured current value of the motor 30 based on the master data. As a result, the slump measurement does not depend on skill level, etc., and it is possible to suppress the occurrence of errors for each individual or measurement like the slump measurement according to the JIS method. etc. becomes unnecessary, slump measurement with high accuracy can be easily performed.

Also, the slump value may change rapidly due to changes in the surface water content of fine aggregate. For this reason, it is desirable to inspect more rods to inspect the slump value in the field. According to the slump measurement described above, it is possible to easily measure the slump, so it is possible to measure the slump not only once in the morning and once in the afternoon, but also every time fresh concrete arrives at the site. It is possible and the number of slump measurements can be increased.

When purchasing ready-mixed concrete on-site for pavement, etc., it is common to purchase ready-mixed concrete brought to the site by a ready-mixed concrete seller's vehicle (for example, an agitator vehicle) for the sum of the material cost and freight. is. Usually, the truck is owned by the ready-mixed concrete seller, so it is difficult to modify the truck of the ready-mixed concrete seller to measure the slump value. It is difficult. If the slump value is not measured for each vehicle, there is a risk of purchasing ready-mixed concrete whose slump value is not within the allowable range. On the other hand, the slump measuring device 10 described above is portable and can be easily introduced to the site. This makes it possible to easily measure the slump value for each transport vehicle, so it is possible to avoid purchasing ready-mixed concrete whose slump value does not fall within the allowable range.

Here, since the current value of the motor 30 is proportional to the load torque, it is possible to grasp the load torque by measuring the current value of the motor 30 . The load torque is a load value (load value) at which ready-mixed concrete hinders rotation of each blade 50 and the rotating shaft 40 in a state where each blade 50 rotates in ready-mixed concrete. This load torque is an example of the resistance value (resistance value) that each blade 50 rotating in the fresh concrete receives from the fresh concrete. Although the load torque, that is, the current value of the motor 30 is measured as the resistance value that each blade 50 rotating in the fresh concrete receives from the fresh concrete, the present invention is not limited to this. You may make it measure rotation speed.

(blade shape and motor wattage)
Next, the shape of the blade 50 and the wattage of the motor 30 will be described.

The blades 50 need to be shaped to repel coarse aggregate and to be in firm contact with the mortar (cement, sand and water) around the blades. A result with a high correlation value (for example, coefficient of determination) was obtained for propeller-type blades, and a high result for correlation values was not obtained for blades of shapes other than propeller-type blades. Therefore, propeller-type blades are used as the blades 50 . Further, when the shape of the blades 50 is a fan-shaped plate, the number of the blades 50 is three, and each plane is parallel to the extending direction of the rotating shaft 40 (see FIG. 1), the correlation value is best results were obtained.

The output of the motor 30 is set to an output capable of rotating the rotating shaft 40 and each blade 50 in ready-mixed concrete with a part of the rotating shaft 40 and each blade 50 inserted in ready-mixed concrete. . If the output of the motor 30 is weak, the blades 50 will not rotate due to the load (resistance) of the ready-mixed concrete.

(Angle of blade)
Next, the angle of blade 50 will be described with reference to FIG. The shape of the blades 50 is a fan-shaped plate, and the number of the blades 50 is three (see FIG. 1).

As shown in FIG. 4, when the angle of the blades 50 with respect to the rotating shaft 40 was 0 degrees or more and 45 degrees or less, results with high correlation values (⊚, ∘, Δ) were obtained. The first angle at which the slump value can be read most sensitively is 0 degrees (90 degrees to the horizontal plane) (◎), and the second angle at which the slump value can be read most sensitively is 0 degrees. It is largely 30 degrees or less (○), and the third angle is greater than 30 degrees and 45 degrees or less (Δ). If the angle is greater than 45 degrees, the difference in the current value of the motor 30 is small when the slump value is low, making it difficult to read the slump value sensitively (x). When the angle of each blade 50 is greater than 0 degrees, each blade 50 is inclined at the same angle in the same direction, that is, in the circumferential direction of the rotating shaft 50 (for example, in the direction of rotation or in the direction opposite to the direction of rotation). there is

Therefore, each blade 50 is formed in a plate shape as described above, and each plane is provided so as to be parallel to the extending direction of the rotating shaft 40 (see FIG. 1). For example, each plane may be provided so as to be inclined in the circumferential direction of the rotating shaft 40 at an angle of 30 degrees or less or 45 degrees or less with respect to the extending direction of the rotating shaft 40 . The angle at which the plane of the blade 50 is parallel to the extending direction of the rotating shaft 40 is 0 degrees.

(Position of blade)
Next, the position of blade 50 will be described with reference to FIG. The shape of the blades 50 is a fan-shaped plate, the number of the blades 50 is three, and the planes of the blades 50 are parallel to the extending direction of the rotating shaft 40 (see FIG. 1).

As shown in FIG. 5, the distance between the tip of the rotating shaft 40 (the lower end of the rotating shaft 40) and the lower end of each blade 50 (the end of each blade 50 on the tip side of the rotating shaft 40) (for example, the vertical spacing) When is greater than 0 cm and less than or equal to 15 cm, results with high correlation values (⊚, Δ) were obtained. The first separation distance at which the slump value can be read most sensitively is 5 cm or more and 10 cm or less (⊚), and the second separation distance at which the slump value can be read second most sensitively is greater than 0 cm and less than 5 cm ( Δ), or greater than 10 cm and 15 cm or less (Δ). If the separation distance is greater than 15 cm, it becomes difficult to read the slump value sensitively (x). The slump measurement was performed at a position in the unicycle where the depth of the ready-mixed concrete was about 17 cm.

The aforementioned separation distance is for ensuring a constant gap between the unicycle bottom plate and the blades 50 . It is desirable to secure 5 cm or more from the lower end of the blade 50, that is, the lowest position of the blade 50, to the bottom plate of the unicycle. The reason for this is that it corresponds to the diameter of one piece of the largest aggregate (4020 crushed stone) in paving concrete, and is intended to eliminate as much as possible the influence of crushed stone that settles to the bottom during slump measurement.

Therefore, each blade 50 is located at a position where the tip end of the rotating shaft 40 and the tip of the rotating shaft 40 of each blade 50 are separated by at least the longest crushed stone size in ready-mixed concrete, for example, at a position separated by 5 cm or more. It is desirable to be provided in However, when performing a simple measurement at a place other than a unicycle, for example, at a concrete pavement construction site (the position where the ready-mixed concrete is unloaded in front of the leveling machine), the packing style (pile) of the ready-mixed concrete is that of a unicycle. It is larger than when inside, and the ready-mixed concrete that exists on top of the reinforcing bars will be measured. In this case, in order to secure a safe distance where each blade 50 does not touch the reinforcing bar, it is better to make the length of the rotation shaft 40 located below each blade 50 longer.

(blade diameter)
Next, the diameter (rotational diameter) of the vanes 50 will be described with reference to FIG. The shape of the blades 50 is a fan-shaped plate, the number of the blades 50 is three, and the planes of the blades 50 are parallel to the extending direction of the rotating shaft 40 (see FIG. 1). Here, the diameter (rotational diameter) of the blades 50 is the diameter of the circle drawn by the tip of each blade 50 when each blade 50 rotates.

As shown in FIG. 6, when the diameter of the blade 50 is 28 cm or less (restrictions due to the size of the unicycle and the output of the motor 30), high correlation values (⊚, ∘, Δ) were obtained. The first diameter at which the slump value can be read most sensitively is 5 cm or more and 15 cm or less (◎), and the second diameter at which the slump value can be read second most sensitively is 15 cm or more and 25 cm or less (○ ), and the third diameter is greater than 0 cm and less than 5 cm (Δ), or greater than 25 cm (Δ).

Therefore, it is desirable that the diameter of the vane 50 is 5 cm or more and 25 cm or less. However, in order to easily measure the slump in the unicycle, if each blade 50 is separated from the side wall of the unicycle by a distance of about 10 cm and the output of the motor 30 is considered, if a result with a high correlation value is obtained, It is desirable that the size of the vane 50 is as small as possible.

(Number of blades)
Next, the number (number of sheets) of the blades 50 will be described with reference to FIG. The blade 50 has a fan-shaped plate shape, and the plane thereof is parallel to the extending direction of the rotating shaft 40 (see FIG. 1).

As shown in FIG. 7, when the number of blades 50 was 2 or more and 9 or less, results with high correlation values (⊚, ∘, Δ) were obtained. The first number that allows the slump value to be read most sensitively is 3 or 4 (◎), and the second number that allows the slump value to be read most sensitively is 2, 5 or 6. (○), and the third number is 7, 8 or 9 (Δ). If the number is one, it becomes difficult to read the slump value sensitively (x).

Therefore, the number of blades 50 is desirably two or more and six or less. If the number of blades 50 is too large, the measurement accuracy will be poor, and if there is only one, the balance will be poor in terms of eccentricity. For this reason, the measurement accuracy is higher with three to four lines than with other numbers. Moreover, it is possible to provide the blades 50 not only in one stage but also in a plurality of stages such as two stages or three stages in the vertical direction. However, the knowledge obtained from the various results as described above is that it is preferable to cover the blades 50 with ready-mixed concrete of, for example, about 5 cm.

In addition, according to the slump measuring device 10 described above, a high correlation value was obtained in the master data even for a container having a round bottom or a flat bottom as a container other than the unicycle. A high correlation is shown for all of the round bottom, flat bottom, and unicycle, and a low slump value is sensitively reflected in the current value of the motor 40 . Considering the measurement at the concrete paving site, it is desirable to realize stable measurement inside the unicycle because the ready-mixed concrete is received from the agitator wheel into the unicycle.

Further, when each blade 50 was rotated in the ready-mixed concrete, it was visually observed that the mortar portion of the ready-mixed concrete gathered around each blade 50 to some extent. Therefore, in order to confirm how much grain size aggregate is moving around each blade 50, after measuring the current value of the motor 30, a sample around each blade 50 was collected, and a 0.075 mm After washing with water through a sieve and drying, sieve analysis was performed. The passage percentage around each blade 50 and the passage percentage outside the circumference of each blade 50 are approximately the same, and even if the material gathers a little mortar around each blade 50, the slump measurement is not affected. was confirmed.

As described above, according to one embodiment, when each blade 50 is rotated in the fresh concrete by being driven by the motor 30, the resistance value, which is the value of the resistance received by each blade 50 from the fresh concrete, is For example, the load torque, that is, the current value of the motor 30 is measured by the measurement unit 82 . Then, the slump value is obtained from the measured current value of the motor 30 based on the master data. As a result, the slump measurement does not depend on skill level, etc., and it is possible to suppress the occurrence of errors for each individual or measurement like the slump measurement according to the JIS method. etc. becomes unnecessary, slump measurement with high accuracy can be easily performed.

<Other embodiments>
In the above description, it is illustrated that the slump value is obtained from the master data based on the current value of the motor 30 by the measurer, but the present invention is not limited to this. The slump value may be determined by the controller 81 based on the master data. In this case, the controller 81 stores the master data, automatically obtains the slump value from the master data based on the current value of the motor 30 measured by the measuring unit 82, and displays the obtained slump value on the display unit 83. do. Note that the control unit 81 functions as an acquisition unit that obtains the slump value. Since the slump value is automatically obtained in this manner, highly accurate slump measurement can be performed more easily.

In the above description, the display unit 83 displays the current value, voltage value, power value, power amount, etc. of the motor 30 as an example, but the display unit 83 is not limited to this. You may make it Note that the display unit 83 also functions as a notification unit that notifies information to the measurer or the like.

Further, in the above description, the measurement unit 80 is provided in the main body 20 as an example, but the present invention is not limited to this. , the display unit 83) may be detachably attached to the belt or work clothes of the measurer, and may be provided separately from the main body 20 (as a separate body).

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. For example, some components may be deleted from all the components shown in the above embodiments. Furthermore, constituent elements of different embodiments may be combined as appropriate.

Reference Signs List 10 Slump measuring machine 11 Wiring 12 Wiring 20 Main body 21 Cylindrical part 22 Grip part 30 Motor 40 Rotating shaft 50 Blade 60 Input part 70 Mounting part 71 Curved plate 71a Extension part 71b Bending part 72 Fixing member 80 Measurement unit 81 Control part 82 Measurement part 83 Display

Claims (9)

a main body configured to be portable;
a motor provided in the body;
a rotating shaft provided in the main body and rotated by driving the motor;
a plurality of blades provided on the rotating shaft and arranged in a circumferential direction of the rotating shaft;
a measuring unit that measures the current value of the motor, which is grasped as a resistance value that is the value of the resistance received from the ready-mixed concrete by the plurality of blades rotating in the ready-mixed concrete,
The plurality of blades are characterized in that the tip end of the rotary shaft and the tip of the rotary shaft of each blade are separated from each other by at least the longest crushed stone size in the ready-mixed concrete. Slump measuring machine. The slump measurement according to claim 1, wherein each of the plurality of blades is formed in a plate shape, and each plane is provided so as to be parallel to the extending direction of the rotating shaft. machine. The plurality of blades are each formed in a plate shape, and each plane is provided so as to be inclined in the circumferential direction of the rotating shaft at an angle of 30 degrees or less with respect to the extending direction of the rotating shaft. The slump measuring machine according to claim 1. The number of the plurality of blades is 2 or more and 6 or less,
The slump measuring machine according to any one of claims 1 to 3, wherein the plurality of blades are arranged at equal intervals in the circumferential direction of the rotating shaft. The slump measuring machine according to any one of claims 1 to 4, further comprising a display section for displaying the current value of the motor measured by the measuring section. a storage unit that stores data indicating the correlation between the resistance value and the slump value;
5. The apparatus according to any one of claims 1 to 4, further comprising an acquisition unit that obtains a slump value from the resistance value measured by the measurement unit based on the data stored by the storage unit. The described slump measuring machine. 7. The slump measuring machine according to claim 6, further comprising a display section for displaying the slump value acquired by the acquisition section. The slump measuring machine according to any one of claims 1 to 7, wherein the measuring section is provided on the main body. a main body formed to be portable; a motor provided in the main body; a rotating shaft provided in the main body and rotated by the driving of the motor; and a plurality of blades, wherein the plurality of blades are positioned such that the tip end of the rotating shaft and the tip of the rotating shaft of each blade are separated from each other by at least the longest crushed stone size in ready-mixed concrete. A slump measuring method for measuring a slump value using a provided slump measuring machine,
a step of measuring, by a measuring unit, the current value of the motor, which is grasped as a resistance value that is the resistance value that the plurality of blades rotating in the ready-mixed concrete receives from the ready-mixed concrete;
obtaining a slump value from the resistance value measured by the measuring unit, based on data indicating the correlation between the resistance value and the slump value;
A slump measuring method comprising:

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