Fluidization measuring instrument

Abstract

To provide a fluidization measuring instrument that can stably measure fluidity of a substrate and can reliably recover a sensor used for measurement.SOLUTION: A fluidization measuring instrument 1 comprises: an insertion and removal jig 10 having an end 11 and an end 12; a shank 20 having an end 21 and an end 22, and connected at the end 21 to the insertion and removal jig 10 and inserted into a substance D together with the insertion and removal jig 10; a rotating body 30 having an end 31 and an end 32, and connected to the end 22 at an attachment position T to be rotatable relative to the insertion and removal jig 10 with the shank 20 as a rotation axis; and a sensor unit 40 capable of detecting the rotation of the rotating body. In the rotating body 30, a center of buoyancy Cb, a center of gravity Cg, and an attachment position T are configured such that, when the rotating body is inserted in its entirety into the substance D while maintaining a first posture where the end 32 is deeper in a depth direction than the end 31, the posture of the rotating body is changed from the first posture to a second posture where the end 31 is deeper in the depth direction than the end 32 due to rotation associated with fluidization of the substance D.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a fluidization meter that measures the degree of fluidization of a material. [Background technology]

[0002] As a conventional method for determining the completion of concrete compaction, there is one that makes it easy to determine the completion of concrete compaction when a vibrator is inserted into concrete poured into a formwork to apply vibration to the concrete to compact it, as shown in Fig. 22 (for example, see Patent Document 1). In this method, a floating body F that rises in the concrete C according to the degree of compaction of the concrete C due to compaction of the concrete C in the formwork M by a vibrator V is installed at the bottom of a location in the formwork M before the concrete is poured where the completion of concrete compaction is to be determined, and from this state the concrete C is poured into the formwork M and compacted by the vibrator V, and the completion of concrete compaction is determined when the floating body F rises. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-183392 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the method of determining completion of concrete compaction in Patent Document 1 has the risk of making it impossible to recover the floating body if it does not float up.

[0005] In view of the above problems, the present disclosure aims to provide a fluidization measuring instrument that can stably measure the degree of fluidity of a substance that is fluidized by vibration or heating, and that can more reliably recover the sensor used for measurement. [Means for solving the problem]

[0006] In order to solve the above problems, the fluidization measuring instrument of this embodiment is a fluidization measuring instrument for measuring the degree of fluidization of a material that is fluidized by vibration or heating, and includes an insertion / extraction jig having a first end and a second end located opposite the first end and inserted into the material before performing the vibration or heating process, a shaft portion having one end and the other end located opposite the one end, one end connected to the insertion / extraction jig and inserted into the material together with the insertion / extraction jig, a third end and a fourth end located opposite the third end, and a rotating body connected to the other end of the shaft portion at an attachment position provided between the third end and the fourth end so that the shaft portion can be rotated relative to the insertion / extraction jig around the rotation axis, and a sensor unit capable of detecting the rotation of the rotating body. The position of the center of buoyancy of the rotor, the position of the center of gravity of the rotor, and the mounting position are configured so that when the rotor is entirely inserted into a substance while maintaining a first position in which the fourth end is deeper in the depth direction than the third end, the rotor will rotate due to fluidization of the substance and change from the first position to a second position in which the third end is deeper in the depth direction than the fourth end. Effect of the Invention

[0007] According to the fluidization measuring instrument of the present embodiment, it is possible to stably measure the degree of fluidity of a substance that is fluidized by vibration or heating, and it is also possible to more reliably recover the sensor used for measurement. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a top view showing a fluidization measuring device 1 according to the first embodiment installed in a formwork 200 into which ready-mixed concrete has been poured. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Diagram 3] FIG. 3 is a flow chart showing a fluidization measurement method using the fluidization measurement device 1. [Figure 4] FIG. 4(a) is a perspective view of the fluidization measuring device 1 according to the first embodiment, and FIG. 4(b) is a cross-sectional view of the fluidization measuring device 1 taken along line AA (FIG. 1). [Diagram 5]FIG. 5 is a front view of the rotating body 30 as viewed from the insertion / extraction jig 10 side. [Figure 6] FIG. 6(a) is a diagram of a volume V1, and FIG. 6(b) is a diagram of a volume V2 having the same external shape as FIG. 6(a). [Figure 7] Figure 7 shows a case where a hole 30H of a rotating body 30 is provided on the end portion 32 side, and Figure 7(a) is an example of a case where the center of gravity Cg is closer to the hole 30H than the center of buoyancy Cb, and Figure 7(b) is an example of a case where the center of buoyancy Cb is closer to the hole 30H than the center of gravity Cg. [Figure 8] Figure 8 shows a case where a hole 30H of a rotating body 30 is provided on the end portion 31 side, and Figure 8(a) is an example where the center of buoyancy Cb is closer to the hole 30H than the center of gravity Cg, and Figure 8(b) is an example where the center of gravity Cg is closer to the hole 30H than the center of buoyancy Cb. [Figure 9] Figure 9 shows an example where the hole 30H of the rotating body 30 is provided between the center of gravity Cg and the center of buoyancy Cb, with Figure 9(a) being an example where the center of gravity Cg is closer to the end 31 than the center of buoyancy Cb, and Figure 9(b) being an example where the center of buoyancy Cb is closer to the end 31 than the center of gravity Cg. [Figure 10] FIG. 10(a) is a perspective view of the fluidization measuring instrument 1 in which a magnetic method is adopted as the sensor section 40, and FIG. 10(b) is a side view thereof. [Figure 11] FIG. 11 is a front view of an example of the rotating body 30 when a magnetic type is adopted as the sensor section 40, as viewed from the insertion / extraction jig 10 side. [Figure 12] FIG. 12 is a front view of an example of the insertion / extraction jig 10 in which a magnetic type is used as the sensor section 40, as viewed from the rotating body 30 side. [Figure 13] FIG. 13 is a diagram showing an example of a method for connecting the shaft portion 20 and the rotor 30 according to a modified example of the first embodiment. [Figure 14] FIG. 14 is a diagram showing another example of a method for connecting the shaft portion 20 and the rotor 30 according to a modified example of the first embodiment. [Figure 15] FIG. 15 is a diagram showing an example of a method for connecting the insertion / extraction jig 10 and the shaft portion 20 according to a modified example of the first embodiment. [Figure 16]FIG. 16 is a diagram showing another method of configuring the insertion / extraction jig 10. In FIG. [Figure 17] FIG. 17(a) is a perspective view of a fluidization measuring instrument 1A according to the second embodiment, and FIG. 17(b) is a side view thereof. [Figure 18] FIG. 18 is a front view of the rotating body 30A as viewed from the insertion / extraction jig 10A side. [Figure 19] FIG. 19 is a front view of the insertion / removal jig 10A as viewed from the rotating body 30A side. [Figure 20] FIG. 20 is a flow chart showing a fluidization measurement method using the fluidization measurement instrument 1A. [Figure 21] FIG. 21 is a diagram showing an example of the positional relationship between the center of gravity Cg, the center of buoyancy Cb, and the shaft portion 20 in the rotating body 30A. [Figure 22] FIG. 22 is a diagram showing a conventional method for determining the completion of concrete compaction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the fluidization measurement method of the present disclosure and a fluidization measuring device 1 used in the method will be described with reference to the drawings. In the following description, components having the same functions are given the same numbers, and duplicated descriptions will be omitted.

[0010] <Fluidization measurement method> Fig. 1 is a top view showing a state in which a fluidization measuring device 1 according to the first embodiment is installed in a formwork 200 into which fresh concrete has been poured, as viewed from above. Fig. 2 is a view showing a cross section taken along line AA in Fig. 1. Fig. 3 is a flowchart showing a fluidization measurement method using the fluidization measuring device 1.

[0011] The fluidization measurement method of the present disclosure measures the degree of fluidization of, for example, fresh concrete poured into a formwork 200. Specifically, a fluidization measuring device 1 is inserted into the fresh concrete, and vibration is applied by a vibrator 400. When the fresh concrete is fluidized by this vibration, a rotor 30 rotates around the shaft portion 20 as the rotation axis depending on the degree of fluidization. The rotation of the rotor 30 is measured by a sensor portion 40 to measure the degree of fluidization. When the measurement target is a material that fluidizes when heated, a heater is used instead of the vibrator 400. Below, an explanation will be given taking fresh concrete as an example of the measurement target.

[0012] 3, in the fluidization measurement method of the present disclosure, first, the end 31 of the rotor 30 is aligned in an upward direction (Z direction in FIG. 4) and the end 32 is aligned in a downward direction (−Z direction in FIG. 4) (hereinafter also referred to as a “first orientation”) with respect to an orientation in which the end 11 of the fluidization measuring instrument 1 is aligned in an upward direction (Z direction in FIG. 4) and the end 12 is aligned in a downward direction (−Z direction in FIG. 4) (step S1). The end 11 and the end 12 will be described later.

[0013] Next, while maintaining the first posture, the end 12 side of the insertion / extraction jig 10 is inserted into the upper layer 90A of the ready-mixed concrete (step S2). As a result, as shown in FIG. 2, in addition to a part of the insertion / extraction jig 10, the shaft portion 20, the rotating body 30, and the sensor portion 40 are inserted into the upper layer 90A of the ready-mixed concrete. Step S2 ensures that the rotating body 30 is set at the desired measurement position. If step S2 causes the rotating body 30 to rotate and no longer maintain the first posture, another jig is used to align the rotating body 30 so that it is in the first posture.

[0014] 2, the vibrator 400 is inserted at a position a length LL away from the rotor 30 during or before excitation (step S3). The length LL and a depth H, which will be described later, are lengths determined to be preferable for measuring the degree of fluidization of the measurement target, which has been adjusted in advance. The length LL is preferably within a range in which the rotor 30 is not easily affected by the vibration of the vibrator 400 itself, and in which the vibration required for fluidization is transmitted.

[0015] When the measurement target is freshly mixed concrete, the insertion depth of the rotor 30 is set to a depth H from the top surface of an upper layer 90A that has been poured above (in the Z direction) a lower layer 90B of freshly mixed concrete that has already been poured the first time and compacted, as shown in Fig. 2. The fluidity measuring instrument 1 can also be used as a method for measuring the fluidity of freshly mixed concrete poured the first time and freshly mixed concrete poured the third time or later. By going through step S3, the rotor 30 is positioned at a depth H and away from the vibrator 400 by a distance LL.

[0016] The vibrator 400 of this embodiment is configured as a general vibrator for compacting fresh concrete. When the fresh concrete is composed of two layers, the vibrator 400 penetrates the upper layer 90A to be compacted, and inserts, for example, about 100 mm near its tip into the lower layer 90B that has already been compacted. If the fresh concrete to be evaluated is fresh concrete poured for the first time, it is necessary to prevent the vibrator 400 from contacting the bottom. The vibrator 400 depends on the diameter and vibration output strength, but for example, if the diameter of the vibrator 400 is 50 mm, the range in which vibration can be transmitted to compact the fresh concrete is about a radius of 250 mm from the center of the vibrator 400.

[0017] Next, the fresh concrete is vibrated by the vibrator 400 (step S4). The vibration of the vibrator 400 starts the fluidization of the fresh concrete. The vibration of the fresh concrete by the vibrator 400 compacts the fresh concrete. When the vibrator 400 operates in the fresh concrete, the particles that make up the fresh concrete try to fall into the gaps between the particles due to the vibration. The particles falling into the gaps increases the water pressure in the gaps. The increase in water pressure reduces the frictional force between the particles, and buoyancy becomes dominant over frictional force in the upper layer 90A of the fresh concrete. This causes the fresh concrete to fluidize.

[0018] As the fluidization of upper layer 90A progresses, the frictional force around rotor 30 decreases. In step S4, due to the buoyancy or gravity acting on rotor 30, rotor 30 in the first posture (end 31 facing upward (Z direction in FIG. 4), end 32 facing downward (-Z direction)) rotates about shaft 20 as the axis of rotation so that end 32 faces upward (Z direction). As a result, rotor 30 tries to change from the first posture to the second posture (end 31 facing downward (-Z direction), end 32 facing upward (Z direction)).

[0019] While the rotating body 30 moves from the first posture to the second posture, or while the rotating body 30 is partway from the first posture to the second posture, the sensor unit 40 detects the rotation of the rotating body 30 (step S5). That is, the sensor unit 40 detects the degree of rotation of the rotating body 30 that rotates around the shaft unit 20 as the rotation axis. The detection result of the sensor unit 40 is sent to the evaluation unit 50 that is connected by wire or wirelessly.

[0020] Next, the evaluation unit 50 outputs a measurement result that can evaluate the degree of fluidization of the measurement target based on the detection result received from the sensor unit 40 (step S6). For example, the degree of rotation of the rotating body 30 may be displayed in chronological order, or a graph showing the relationship between a predetermined degree of rotation and the degree of fluidization of the measurement target may be displayed. However, these are merely examples, and any output may be used as long as the measurement result can be used to evaluate the degree of fluidization of the measurement target. In step S6, the user evaluates the degree of fluidization of the measurement target.

[0021] When the user determines from the measurement result output in step S6 that the desired degree of fluidization has been achieved, the insertion / extraction jig 10 is pulled up (step S7). As described below, the insertion / extraction jig 10 is connected to the shaft portion 20, which is connected to the rotating body 30. Therefore, by pulling up the insertion / extraction jig 10 in step S7, the rotating body 30 can be reliably collected.

[0022] When the measurement target is fresh concrete, step S7 is performed before the time when compaction is predicted to be completed. Specifically, it is performed several to several tens of seconds, preferably 1 to 10 seconds, and more preferably 1 to 5 seconds before the time when compaction is predicted to be completed. Meanwhile, the operation of the vibrator 400 in step S4 is continued until the time when compaction is predicted to be completed, and then the vibrator 400 is lifted (step S8).

[0023] For example, if a graph of the acceleration of the rotor 30 is obtained in step S6, the vibration time for which compaction is predicted to be completed is the time until an extension line of a gradient determined from the graph, which is set between one and a dozen seconds, reaches a preset resultant acceleration for which compaction is predicted to be completed. The resultant acceleration for which compaction is predicted to be completed is set based on the relationship between the resultant acceleration and the quality of the concrete after hardening. This completes the fluidization measurement method.

[0024] An embodiment of the fluidization measuring device 1 used in the above-mentioned fluidization measuring method will be described below.

[0025] First Embodiment Fig. 4(a) is a perspective view of the fluidization measuring instrument 1 according to the first embodiment, and Fig. 4(b) is a cross-sectional view of the fluidization measuring instrument 1 taken along line AA (Fig. 1). The fluidization measuring instrument 1 according to the first embodiment of the present disclosure is for measuring the degree of fluidization of a substance (substance D) that is fluidized by vibration or heating. As shown in Figs. 4(a) and (b), the fluidization measuring instrument 1 includes, for example, an insertion / removal jig 10, a shaft portion 20, a rotating body 30, and a sensor portion 40.

[0026] (Insertion / Removal Tool 10) The insertion / extraction jig 10 has an end 11 and an end 12 located on the opposite side to the end 11 and inserted into the material D before performing the vibration or heating process. The insertion / extraction jig 10 has, for example, a thin rod shape having a substantially rectangular cross section. The insertion / extraction jig 10 is made of, for example, stainless steel. In the example of FIG. 4, the end 11 has a flat surface, and the end 12 has a curved surface. It is preferable that the end 12 has a tapered shape such as a pointed tip. The tapered shape may be another tapered shape such as a pyramidal shape or a conical shape. The end 12 side of the insertion / extraction jig 10 corresponds to the side that is inserted into the material D that is the measurement target. The end 11 side of the insertion / extraction jig 10 corresponds to the handle side that a user operates the insertion / extraction jig 10 to insert the rotor 30 into the material D and place it at a desired measurement position.

[0027] (Shaft 20) Shank 20 has, for example, a slender rod shape with a substantially circular cross section, and has end 21 and end 22 located opposite end 21. Shank 20 is made of, for example, SUS. End 21 is connected to insertion / extraction jig 10 so as to be rotatable around shaft 20 as a rotation axis, and end 22 is fixedly connected to rotor 30. Shank 20 is inserted into substance D together with end 12 of insertion / extraction jig 10 in order to measure the degree of fluidization of substance D.

[0028] (rotating body 30) The rotating body 30 has, for example, a substantially rectangular parallelepiped shape having a substantially rectangular cross section, and has an end 31 and an end 32 located opposite to the end 31. In this example, the end 32 side of the rotating body 30 has a tapered shape configured as a triangular prism so that the rotating body 30 can be easily inserted into the material D. The tapered shape may be other tapered shapes such as a pyramidal shape or a conical shape. The rotating body 30 is made of, for example, SUS. The rotating body 30 is fixedly connected to the end 22 side of the shaft portion 20 at a predetermined position (attachment position T) provided between the end 31 and the end 32. As a result, the rotating body 30 is fixedly connected to the shaft portion 20 so as to be rotatable with respect to the insertion / extraction jig 10 with the shaft portion 20 as a rotation axis.

[0029] 5 is a front view of the rotating body 30 as seen from the side of the insertion / extraction tool 10. In this example, the length of the rotating body 30 is L, and the length L r The hole 30H is provided at the position where the shaft portion 20 is inserted. The hole 30H corresponds to the mounting position T. In this example, in order to promote the rotation direction of the rotor 30 in one direction, the central axis of the hole 30H is spaced a length L from the central axis of the rotor 30 in the width direction. s 5 (Y direction). In other words, the center of the mounting position T is shifted to the left side (Y direction) of the rotating body 30 (center of buoyancy C b ) and the center of gravity of the rotating body 30 (center of gravity C g ) on the straight line passing through the center axis of the hole 30H. However, this deviation (distance) may be provided as necessary and is not essential. In this example, the length L b The center of buoyancy C of the rotating body 30 is at the point b In this example, the length L from the center axis of the hole 30H to the end 31 side is g The center of gravity C of the rotating body 30 is at the point g The center of buoyancy C b and center of gravity C g is the shift length L s In the case where a rotatable member 30 is provided, it may be offset from the central axis of the rotatable member 30 in the width direction W, but such offset is not considered here.

[0030] (Sensor unit 40) The sensor unit 40 detects the rotation of the rotating body 30. The sensor unit 40 is, for example, a rotary encoder or a resolver. When the sensor unit 40 is a rotary encoder or a resolver, the sensor unit 40 is attached, for example, to the surface 13 side of the insertion / removal jig 10. As shown in FIG. 4(b), the end 21 of the shaft portion 20 is inserted into the sensor unit 40 through a hole portion 10H that penetrates the surface 13 and the surface 14 provided on the insertion / removal jig 10. The sensor unit 40 detects the rotation of the shaft of the shaft portion 20. Since the shaft portion 20 and the rotating body 30 are fixedly connected, the sensor unit 40 indirectly detects the rotation of the rotating body 30 by detecting the rotation of the shaft portion 20 by the sensor unit 40.

[0031] (Center of gravity C in the rotating body 30g , floating center C b , and the relative positional relationship of mounting position T) The fluidization measurement method using the fluidization measuring device 1 is performed by measuring the change in rotation of the rotating body 30 inserted into the substance D. Here, when the entire rotating body 30 is inserted into the substance D, the center of gravity C of the rotating body 30 is g , floating center C b , and the mounting position T, which is the mounting position of the shaft portion 20, affects the rotation behavior of the rotating body 30.

[0032] 3, the rotating body 30 is inserted into the material D in a first attitude. Therefore, the first attitude will be described as a basic state.

[0033] In the following, in order to facilitate understanding, (1) the hole 30H (attachment position T) is b and center of gravity C g When the hole 30H is provided closer to the end 32 than the center of buoyancy C, (2) b and center of gravity C g When the hole 30H is provided closer to the end 31 than the center of buoyancy C, (3) b and center of gravity C g When it is installed between

[0034] [(1) Hole 30H, center of buoyancy C b and center of gravity C g When the end 32 side is provided closer to the When the rotating body 30 does not have a space inside and is made of a single material, the center of buoyancy C of the rotating body 30 b and center of gravity C g When the rotor 30 is made of a plurality of materials with different specific gravities, or when the rotor 30 is made of a single material but has internal space, and the entire interior of the rotor 30 is not filled with the same material, the center of buoyancy C of the rotor 30 b and center of gravity C g This is not limited to the rotor 30, but is a general phenomenon that occurs similarly in other components.

[0035] FIG. 6(a) is a diagram of volume V1, and FIG. 6(b) is a diagram of volume V2, the external shape of which is the same as FIG. 6(a). The diagram shown in FIG. 6(a) is a rectangular parallelepiped with volume V1, and the inside is filled with one material, such as SUS304. In this case, the center of gravity C g and Floating Heart C b The figure shown in Fig. 6(b) has the same external shape as Fig. 6(a), and is the same in that it is filled with one material, for example SUS304. However, there is an internal space with a volume P from the center upward (Z side), resulting in a volume of V2 (=V1-P). In this case, the center of buoyancy C in Fig. 6(b) b is in the same position as in Fig. 6(a), but the center of gravity C in Fig. 6(b) g In this way, even if the shape appears the same, the center of gravity C g Therefore, by adjusting the shape and specific gravity of the rotor 30, the position of the center of gravity C g ,center of buoyancy C b , and the position of the mounting position T can be adjusted.

[0036] FIG. 7 shows a case where the hole 30H of the rotor 30 is provided on the end 32 side. b Center of gravity C g is closer to the hole 30H, and FIG. 7(b) shows the center of gravity C g More floating than C b 7(a) and 7(b) show a state where the rotating body 30 is rotated 10 degrees clockwise with respect to the central axis of the hole 30H in order to facilitate understanding. s In Figure 7(a) and (b), the center of buoyancy C b Buoyancy force F in the upward direction (Z direction) b acts on the center of gravity C g Gravity F downward (-Z direction) gTherefore, in order to rotate the rotor 30 around the central axis of the hole 30H as the material D becomes fluid, a force is required to rotate the rotor 30 further clockwise from the state shown in FIG. 7(a)(b). Here, the force related to the rotation of the rotor 30 is gravity F g and buoyancy F b Assuming that only F g ×L g >F b ×L b Here, the specific gravity of the substance D is S0, and the specific gravity of the rotating body 30 is S1. The rotating body 30 has no internal space. The acceleration of gravity is g. F b = S0 × (volume of the rotor 30) × g, and F g = S1 × (volume of the rotor 30) × g. Therefore, L g >(S0 / S1)L b (hereinafter, also referred to as the "first relationship") is necessary. That is, in the case of (1) above, the center of buoyancy C b The length from the mounting position T to the center of gravity C g The ratio of the length from the mounting position T to the mounting position T satisfies a predetermined first relationship.

[0037] For example, if the material D is fresh concrete (specific gravity S0 = 2.3) and the material of the rotor 30 is SUS304 (specific gravity S1 = 7.9), then L g >0.291L b For example, if the material of the rotor 30 is polypropylene (specific gravity S1=0.9), then L g >2.55L b The rotating body 30 must be configured so that

[0038] [(2) Hole 30H, center of buoyancy C b and center of gravity C g When the end 31 side is provided closer to the FIG. 8 shows a case where the hole 30H of the rotor 30 is provided on the end 31 side. g More floating than C b is closer to the hole 30H.b Center of gravity C g 8(a) and 8(b) are examples in which the rotating body 30 is rotated 10 degrees clockwise with respect to the central axis of the hole 30H, and the shift length L s In order to rotate the rotor 30 as the substance D becomes fluid, a force is required to rotate the rotor 30 further clockwise from the state shown in FIG. 8. Considering the relationship of the rotational moment in the same way as in FIG. 7, in FIG. 8(a) and (b), L g <(S0 / S1)L b In other words, in the case of (2) above, the center of buoyancy C b The length from the mounting position T to the center of gravity C g The ratio of the length from the mounting position T to the mounting position N must satisfy a second predetermined relationship.

[0039] For example, if the material D is fresh concrete (specific gravity S0 = 2.3) and the material of the rotor 30 is SUS304 (specific gravity S1 = 7.9), then L g <0.291L b For example, if the material of the rotor 30 is polypropylene (specific gravity S1=0.9), then L g <2.55L b The rotating body 30 must be configured so that

[0040] [(3) Hole 30H, center of buoyancy C b and center of gravity C g When placed between FIG. 9 shows the hole 30H of the rotor 30 at the center of gravity C g and Floating Heart C b In the case where the center of gravity C g The floating center C b 9(b) is an example of a case where the center of buoyancy C b is the center of gravity C g 9(a) and 9(b), the rotor 30 is rotated 10 degrees clockwise with respect to the central axis of the hole 30H, and the shift length L sIn order to rotate the rotor 30 as the substance D becomes fluid, a force is required to rotate the rotor 30 further clockwise from the state shown in FIG. 9. Considering the relationship of the rotational moment in the same way as in FIG. 7, in FIG. 9(a), the buoyant force F b and gravity F g In FIG. 9(b), the buoyant force F b and gravity F g Both of these act as a force urging the rotating body 30 to rotate counterclockwise around the shaft portion 20 as a central axis. That is, Fig. 9(a) is considered to be a good positional relationship for detecting the state of rotation of the rotating body 30. On the other hand, Fig. 9(b) is considered to be a positional relationship that is not suitable for detecting the state of rotation of the rotating body 30. That is, in the above-mentioned case (3), the rotating body 30 needs to have a relationship (hereinafter also referred to as "third relationship") in which the center of buoyancy Cb is located closer to the end 32 than the mounting position T and the center of gravity Cg is located closer to the end 31 than the mounting position T in the first posture.

[0041] To summarize the above, (1) the position of the hole 30H, which is the mounting position of the shaft portion 20 in the rotor 30, is located at the center of buoyancy C b , center of gravity C g When the end 32 side is provided, L g >(S0 / S1)L b (2) The position of the hole 30H in the rotor 30 is set so that the center of buoyancy C b , center of gravity C g When the end 31 is located closer to the end 31 than the end 31, L g <(S0 / S1)L b (3) The position of the hole 30H in the rotor 30 is set so as to be closer to the center of buoyancy C b and center of gravity C g If it is installed between the center of buoyancy C b on the end 32 side, and the center of gravity C g On the other hand, it is necessary to satisfy a third relationship in which the end 31 is on the end portion 31 side.

[0042] However, in actual phenomena, it is affected by other factors, such as frictional resistance between the insertion / removal jig 10 and the shaft portion 20. In particular, in the case of fresh concrete, as the concrete fluidizes, buoyancy becomes more dominant than frictional force in the upper layer 90A of the fresh concrete, but there are still situations in which buoyancy is not fully exerted due to frictional force. Therefore, the above (1) to (3) should be used as basic standards, and in practice, the center of gravity C should be determined by repeating experiments, etc. g , floating center C b , and the attachment position T. That is, the position of the center of buoyancy Cb of the rotating body 30, the position of the center of gravity Cg of the rotating body 30, and the attachment position T must be configured so that when the rotating body 30 of this embodiment is inserted entirely into the substance D while maintaining a first posture in which the end 32 is deeper in the depth direction than the end 31, the end 31 will change from the first posture to a second posture in which the end 31 is deeper in the depth direction due to rotation accompanying fluidization of the substance D. In the determined positional relationship, the relationship between the change in rotation of the rotating body 30 and the degree of fluidization of the substance D is acquired in advance.

[0043] The embodiment of the fluidization measuring instrument according to the present disclosure has been described above. By configuring the fluidization measuring instrument 1 as described above, the rotating body 30 can be placed at a desired measurement position in relation to the vibrator 400 by operating the insertion / extraction jig 10. The rotating body 30 can be rotated around the shaft portion 20 relative to the insertion / extraction jig 10, and the degree of fluidization of the substance D can be measured. After measurement, the rotating body 30 can be reliably retrieved by lifting the insertion / extraction jig 10. In other words, according to the fluidization measuring instrument of this embodiment, the degree of fluidity of a substance that is fluidized by vibration or heating can be stably measured, and the sensor used for measurement can be more reliably retrieved.

[0044] <Modification of the first embodiment> The fluidization measuring instrument 1 may adopt a magnetic system as the sensor unit 40. FIG. 10(a) is a perspective view of the fluidization measuring instrument 1 when the magnetic system is adopted as the sensor unit 40, and FIG. 10(b) is a side view thereof. In FIG. 10(b), the magnetic sensor 40a and the magnet 30a, which are not visible in the side view, are indicated by dotted lines. FIG. 11 is a front view of an example of the rotating body 30 when the magnetic system is adopted as the sensor unit 40, seen from the insertion / removal jig 10 side. FIG. 12 is a front view of an example of the insertion / removal jig 10 when the magnetic system is adopted as the sensor unit 40, seen from the rotating body 30 side. In FIGS. 10 to 12, as an example, the mounting position T is provided on the end 32 side of the rotating body 30, and is shown under the above-mentioned condition (1). However, this modified example may be any of the above-mentioned conditions (1) to (3).

[0045] In the rotating body 30 of this modification, as shown in Fig. 10(b) and Fig. 11, a magnet 30a is embedded on the end 32 side of the surface 33. In the insertion / extraction jig 10, as shown in Fig. 10(b) and Fig. 12, a plurality of magnetic sensors 40a for detecting the magnetism of the magnet 30a are embedded around a hole 10H, which is a connection part with the shaft portion 20, on the surface 14 side. According to the configuration of this modification, when the rotating body 30 rotates about the shaft portion 20 as a central axis, the magnet 30a embedded in the rotating body 30 also rotates about the shaft portion 20 as a central axis. The rotational movement of the magnet 30a is detected by the magnetic sensor 40a embedded in the insertion / extraction jig 10.

[0046] FIG. 13 is a diagram showing an example of a method for connecting the shaft portion 20 and the rotating body 30 according to a modified example of the first embodiment. FIG. 14 is a diagram showing another example of a method for connecting the shaft portion 20 and the rotating body 30 according to a modified example of the first embodiment. Like FIG. 4(b), FIGS. 13 and 14 show the shaft portion 20 and the rotating body 30 in a cross-sectional view taken along line AA (FIG. 1). When a magnetic sensor 40a is used as the sensor portion 40, it is possible to connect the rotating body 30 to the shaft portion 20 so as to be rotatable. In this case, as shown in FIG. 13, the hole portion 30H of the rotating body 30 may be provided as a through hole having a diameter d2 larger than the diameter d1 of the shaft portion 20, and the shaft portion 20 may be inserted therethrough. In this case, in order to make the connection on the end portion 22 side more reliable, it is preferable to configure the diameter d3 to be larger than the diameter d2. When the rotating body 30 is connected to the shaft portion 20 so as to be rotatable, the shaft portion 20 and the insertion / removal jig 10 are fixedly connected.

[0047] As another example of connecting the rotor 30 to the shaft 20 so as to be rotatable, as shown in FIG. 14, the hole 30H may be a cylindrical hole having a diameter d5, not a through hole, provided in the rotor 30, and a hole having a diameter d2 smaller than the diameter d5, provided from the surface 33 side to the cylindrical hole. Here, the diameter d4 of the end 22 is configured so that d5>d4>d2. This allows the end 22 having the diameter d4 to rotate inside the rotor 30, and the rotor 30 is connected to the shaft 20 so as to be rotatable. To obtain the rotor 30 in FIG. 14, for example, the rotor 30 is configured as two parts based on the central axis in the width direction W (FIG. 11), the shaft 20 is sandwiched between the two parts, and the two parts are joined to obtain the rotor 30.

[0048] FIG. 15 is a diagram showing an example of a method of connecting the insertion / extraction jig 10 and the shaft portion 20 according to a modified example of the first embodiment. When a magnetic sensor is used for the sensor unit 40 and the rotating body 30 and the shaft portion 20 are fixedly connected, it is necessary to connect the shaft portion 20 to the insertion / extraction jig 10 so as to be rotatable. In this case, as shown in FIG. 15, the end 21 side of the shaft portion 20 is configured to have a diameter d7 larger than the shaft diameter d1 of the shaft portion 20, and a cylindrical hole having a diameter d8 larger than the diameter d7 is provided in the insertion / extraction jig 10, and a hole having a diameter d6 (d7>d6>d1) leading to this cylindrical hole is provided from the surface 14 side. This allows the end 21 of the shaft portion 20 to rotate inside the insertion / extraction jig 10, and the shaft portion 20 is connected to the insertion / extraction jig 10 so as to be rotatable. To obtain the insertion / extraction jig 10 of Figure 15, for example, as described in Figure 14, the insertion / extraction jig 10 is constructed as two parts, the shaft portion 20 is sandwiched between the two parts, and the two parts are then joined to obtain the insertion / extraction jig 10.

[0049] When adopting the shape of Fig. 15, the magnet 30a may be attached to the end portion 21 side instead of inside the rotor 30, and the magnetic sensor 40a may be provided at a position where the magnetism of the magnet 30a can be detected. In the case of Fig. 15, the shaft portion 20 and the rotor 30 are fixedly connected, so that the rotational movement of the rotor 30 can be indirectly detected by the rotational movement of the magnet 30a attached to the end portion 21 side. In this case, care must be taken to ensure that the attachment of the magnet 30a does not cause the shaft portion 20 to resonate due to the rotation of the shaft portion 20.

[0050] The insertion / extraction jig 10 may be configured as shown in FIG. 16. FIG. 16 is a diagram showing another method of configuring the insertion / extraction jig 10. In FIG. 4 and FIG. 10, the shaft portion 20 is connected to the end portion 12 side of the insertion / extraction jig 10 near the end portion 12, but as shown in FIG. 16(a), the shaft portion 20 may be connected so as to protrude directly from the end portion 12 of the insertion / extraction jig 10. Alternatively, the shaft portion 20 may not only be connected to the insertion / extraction jig 10 at the end portion 21 side, but also be provided with an insertion / extraction jig 10X corresponding to the insertion / extraction jig 10 at the end portion 22 side as shown in FIG. 16(b), and the insertion / extraction jig 10X may be connected to the end portion 22 side. In this case, as shown in FIG. 16(c), the insertion / extraction jig 10 and the insertion / extraction jig 10X may be configured so that the end portions 11 sides are joined to each other to be integrated.

[0051] <Second embodiment> In the fluidization measuring instrument 1, when the rotating body 30 is configured with a specific gravity smaller than that of the substance D, the fluidization measuring instrument 1A shown in FIG. 17 may be configured. For example, when the substance D is ready-mixed concrete (specific gravity S0=2.3), the rotating body 30 is configured with polypropylene (specific gravity S1=0.9). FIG. 17(a) is a perspective view of the fluidization measuring instrument 1A according to the second embodiment, and FIG. 17(b) is a side view thereof. In FIG. 17(a), the shaft portion 20 and the rotating body 30, which are not visible in the perspective view, are indicated by dotted lines. In FIG. 17(b), the magnetic sensor 40a and the magnet 30a, which are not visible in the side view, are indicated by dotted lines. The fluidization measuring instrument 1A includes an insertion / removal jig 10A, a shaft portion 20, a rotating body 30A, and a sensor portion 40. The sensor portion 40 employs the above-mentioned magnetic sensor system (magnetic sensor 40a).

[0052] Fig. 18 is a front view of the rotating body 30A as viewed from the insertion / extraction jig 10A side. Fig. 19 is a front view of the insertion / extraction jig 10A as viewed from the rotating body 30A side.

[0053] In the fluidization measuring instrument 1, the hole 30H of the rotor 30 had a circular hole shape. In the fluidization measuring instrument 1A, the hole 30H of the rotor 30A has an elongated hole shape that allows the shaft 20 to move in the length direction of the rotor 30A (Z direction, -Z direction in FIG. 18). In other words, the hole 30H has a shape that allows the end 22 side of the shaft 20 to move from a predetermined position (first position α) to a position (second position β) closer to the end 32 than the first position α. ​​The rotor 30 is rotatably attached via the hole 30H on the end 22 side of the shaft 20 with the shaft 20 as the rotation axis. Note that in the fluidization measuring instrument 1A, the length R from the rotation center of the rotor 30 to the magnet 30a is 1 / 2 mm. m The width of the insertion / removal jig 10A is wider to accommodate this, as shown in FIG. 10 In addition, since the rotating body 30A is rotatably connected to the shaft portion 20, the shaft portion 20 and the insertion / extraction jig 10 are fixedly connected to each other.

[0054] FIG. 20 is a flow chart showing a fluidization measurement method using the fluidization measuring instrument 1A. In FIG. 20, the insertion / removal jig 10 in FIG. 3 is replaced by the insertion / removal jig 10A, the rotating body 30 is replaced by the rotating body 30A, the sensor unit 40 is replaced by the magnetic sensor 40a, and the notation of step S7 is formally changed from "pull up" to "second pull up". The fluidization measurement method of the fluidization measuring instrument 1A is substantially different from the fluidization measurement method of the fluidization measuring instrument 1 in that step S2-2 is added. Since the rotating body 30A has a smaller specific gravity than the substance D, when the fluidization measuring instrument 1 is inserted into the substance D in step S2, the shaft part 20 is inserted in the depth direction in a state where it is located on the end part 32 side of the rotating body 30 in the long hole of the hole part 30H (second position β). That is, by forming the rotating body 30A in the form of an elongated hole, a state in which the rotating body 30A is less likely to rotate can be maintained during the insertion of the insertion / extraction jig 10A in step S2.

[0055] When the rotating body 30A is placed at the desired measurement position, the insertion / removal jig 10A is pulled up a predetermined length so that the shaft portion 20 moves to the end portion 31 side (first position α) of the hole portion 30H of the rotating body 30A (first pull-up, step S2-2). That is, the shaft portion 20 is pulled up from the second position β to the first position α. ​​By carrying out step S2-2, R m With the rotational speed increased, the rotation of the rotor 30A can be promoted.

[0056] FIG. 21 shows the center of gravity C of the rotating body 30A. g and Floating Heart C b FIG. 1 is a diagram showing an example of the positional relationship between the end 32 and the shaft portion 20. When the rotor 30 is in a state where the end 32 is kept in a first position in which the end 32 is deeper in the depth direction than the end 31 and the end 22 side of the shaft portion 20 is located at a first position α, the center of buoyancy C of the rotor 30A is moved from the first position to a second position in which the end 31 is deeper in the depth direction than the end 32 by the rotation of the rotor 30A caused by the fluidization of the material D. b and the position of the center of gravity C of the rotating body 30 g Since the magnet 30a is embedded in the rotor 30A on the end 32 side, the distance R between the shaft 20 and the magnet 30a is m This allows the use of a larger radius R than that of the fluidization measuring instrument 1. m The rotational movement in the circumferential direction is easily possible with the radius R m In the case where a long distance can be ensured, the fluidization measuring instrument 1A can detect the rotational movement of the rotor 30A with higher accuracy than the rotational movement of the rotor 30 of the fluidization measuring instrument 1.

[0057] The embodiment and modified examples of the present disclosure have been described above. In the present embodiment, the substance D has been described using ready-mix concrete as an example, but the substance D is not limited to ready-mix concrete as long as it is fluidized by vibration or heating. For example, the substance D may be a food product such as curry roux that is fluidized by heating, or other substances.

[0058] Also, instead of adopting a magnetic sensor system for the sensor unit 40, a combination of a light receiving element and a light emitting element may be used. For example, a light emitting element may be used instead of a magnet, and a light receiving element may be used instead of a magnetic sensor. When an accelerometer is adopted as the sensor unit 40, it may be mounted on the rotating body 30 and configured to send the result to the evaluation unit 50. The function of the evaluation unit 50 may be provided in the insertion / removal jig 10 or the insertion / removal jig 10A. Needless to say, the shapes, sizes, materials, etc. of the insertion / removal jig 10, the shaft portion 20, the rotating body 30, and the sensor unit 40 described in this embodiment can be appropriately changed without departing from the spirit of the present disclosure. [Explanation of symbols]

[0059] 1,1A Fluidization Measuring Instrument 10,10A Insertion / Removal Tool 10H,30H Hole 11,12,21,22,31,32 End 13,14,33,34 sides 20 Shaft 200 Formwork 30,30A Rotating Body 30a Magnet 310 Part 1 320 Part 2 40 Sensor section 40a Magnetic sensor 400 Shaker 50 Evaluation Section 90A upper layer 90B lower layer C g center of gravity C b floating heart d1 Shaft diameter d2~d8 diameter D substance F b buoyancy F g gravity L,LL,L b ,L g ,L r ,L s ,R m ,W,W10 Length S0, S1 specific gravity T mounting position α first position β second position

Claims

1. A fluidization measuring device for measuring the degree of fluidization of a material that is fluidized by vibration or heating, a first end and a second end opposite the first end, the second end being inserted into the material prior to performing the vibration or heating step; An insertion / removal tool; a shaft portion having one end and another end located opposite to the one end, the one end being connected to the insertion / removal jig and being inserted into the substance together with the insertion / removal jig; a rotating body having a third end and a fourth end located opposite to the third end, the rotating body being connected to the other end of the shaft portion at an attachment position provided between the third end and the fourth end so as to be rotatable with respect to the insertion / extraction jig about the shaft portion as a rotation axis; A sensor unit capable of detecting rotation of the rotating body; Equipped with the position of the center of buoyancy of the rotating body, the position of the center of gravity of the rotating body, and the mounting position are configured such that when the rotating body is inserted entirely into the substance while maintaining a first position in which the fourth end is deeper in the depth direction than the third end, the rotation caused by fluidization of the substance causes the rotating body to change from the first position to a second position in which the third end is deeper in the depth direction than the fourth end. Fluidization measuring instrument.

2. The fluidization measuring instrument of claim 1, wherein, in the first posture, the center of buoyancy of the rotating body is located closer to the fourth end than the mounting position, and the center of gravity is located closer to the third end than the mounting position.

3. The fluidization measuring instrument of claim 1, wherein, in the first posture, the rotating body is configured such that the mounting position is located on the fourth end side of the center of buoyancy and the center of gravity, and the ratio of the length from the center of buoyancy to the mounting position and the length from the center of gravity to the mounting position satisfies a predetermined first relationship.

4. The fluidization measuring instrument of claim 1, wherein, in the first posture, the rotating body is configured such that the mounting position is located on the third end side of the center of buoyancy and the center of gravity, and the ratio of the length from the center of buoyancy to the mounting position and the length from the center of gravity to the mounting position satisfies a predetermined second relationship.

5. The fluidization measuring device according to claim 2 , wherein the center of the mounting position is configured to be spaced apart from a straight line passing through the center of buoyancy and the center of gravity.

6. The fluidization measuring device according to claim 2 , wherein the one end of the shaft portion is fixedly connected to the insertion / removal jig.

7. The fluidization measuring instrument according to claim 2 , wherein the rotating body is fixedly connected to the other end of the shaft portion.

8. The fluidization measuring instrument according to claim 7 , wherein the shaft portion is connected to the insertion / removal jig so as to be rotatable about an axial direction.

9. The fluidization measuring instrument according to claim 8 , wherein the sensor unit is mounted on the rotating body.

10. A fluidization measuring device for measuring the degree of fluidization of a material that is fluidized by vibration or heating, an insertion / removal tool having a first end and a second end located opposite the first end and inserted into the material before performing a vibration or heating step; a shaft portion having one end fixedly connected to the insertion / removal jig and another end located opposite to the one end, the shaft portion being inserted into the substance together with the insertion / removal jig; a rotor having a third end, a fourth end located opposite to the third end, and a long hole portion that allows the other end side of the shaft portion to move from a first position to a second position that is closer to the fourth end than the first position, the rotor being rotatably attached to the other end side of the shaft portion via the long hole portion with the shaft portion as a rotation axis, the rotor being made of a specific gravity smaller than that of the substance; A sensor unit capable of detecting rotation of the rotating body; Equipped with the rotating body is in a state where the rotating body is entirely inserted into the substance while maintaining a first posture in which the fourth end is deeper in the depth direction than the third end, and the other end side of the shaft portion is located at the first position, the position of the center of buoyancy of the rotating body, the position of the center of gravity of the rotating body, and the first position are configured such that, due to the rotation caused by fluidization of the substance, the third end changes from the first posture to a second posture in which the third end is deeper in the depth direction than the fourth end. Fluidization measuring instrument.

Images