JPS6034692B2 - Powder adhesion measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an apparatus for controlling the adhesion of powder and granular materials.

There are various methods for measuring the adhesion force of powder and granular materials.

The present invention relates to an improvement in a tensile strength adhesion measuring device for a two-part cell.As shown in FIG. A ball bearing D was used in the moving part, and a tensile force T was applied to the movable cell F and this was measured. However, with this type, the rolling friction of the ball bearing D cannot be ignored, extremely high precision is required in machining the rolling surface or groove of the pole bearing D, and when a consolidation load is applied to fill the sample into the cell. , or when it is removed, the movable cell F tends to move easily, and this tendency becomes stronger as the added load increases, making it not only difficult to handle but also making measurement impossible. Another disadvantage is that the added load cannot be increased too much due to the strength of the ball bearing D and its rolling surface. The present invention eliminates these drawbacks and employs a suspension system using suspension sections.The configuration of the present invention will be explained below with reference to its embodiments. Reference numeral 1 designates a device stand, on the top of which a fixed frame 3 is fixed via an adjustment screw 2, a support 4 is provided on the fixed frame 3, and an upper knife edge 5a of a suspension member 5 is attached to the upper end of the support frame 3.
A movable frame 6 is supported on the knife edge 5b at the lower end of the suspension member 5, and the movable frame 6 is supported by the suspension member 5 disposed in a fixed direction so as to be able to swing in the longitudinal direction of the table 1. The suspension member 6 is suspended from the movable frame 6 for a slight horizontal movement of the movable frame 6 for measurement in the device.
The movable cell 7 is fixed to the center of the movable frame 6, and the other half of the sample cell is fixed to the center of the movable frame 6. The movable frame 6 is fixed to the fixed frame 3 so as to correspond to the fixed cell 7 and have the same height, so that the movable frame 6 can move relative to the fixed cell 8 without any hindrance. The suspension members 5 are arranged so that the gap between them becomes zero under the natural suspension of the suspension members 5, and the upper surface of the fixed frame 3 is held horizontally by the adjustment screws 2.

Therefore, the support column 4 is made to have sufficient strength so that there is no risk of sagging or hindering measurement due to the additional load when filling the sample, and the same is true for the suspension member 5. It is made of a material that has sufficient strength against the force in the tensile direction and has little elongation against the load, and its general shape is U-shaped or square-shaped, but it can be shaped into other shapes as necessary. Design changes are possible.

Further, a pin 9 is provided on the holder 1, and a hole 10 is provided in the fixed frame 3 in correspondence with the pin 9, so that the position of the fixed frame 3 with respect to the holder 1 is determined. 11 is a winding mechanism, and motor 1
2. It is composed of a pulley 13, a set screw 14, a washer 15, etc., and the pulley IJ 13 is held between the motor shaft 16 by tightening the set screw 14, and the wire 17 is wound at a slow speed. When the set screw 14 is loosened, the pulley 13 will slide between it and the motor shaft 16.

17 is a wire whose end is connected so as to be wound around the pulley 13, and whose end is connected via an elastic body 18 to a hook 19 provided at one end of the movable frame.
A flange 20 is provided on a part of the flange 20, a plate spring 21 is provided in contact with the flange 201, and a strain gauge 22 is attached to the plate spring 21, so that the amount of movement of the wire 17 is measured via the plate spring 21, and an electrical signal is generated. The strain gauge 22 is connected by wire to a general intensifying device 27, a recorder 28, etc., and the elastic body 1
The load corresponding to the elongation of 8 should be verified.

The elastic body 18 may be a coil spring or other material such as rubber, as long as it can obtain a reaction force against stretching, and is also used to absorb minute vibrations of the winding mechanism 11 and the like. Note that the tensile force on the movable cell 7 can be detected by a general minute load transducer (for example, T-C type load transducer manufactured by Kyowa Dengyo Co., Ltd.) that uses a strain gauge (not shown) on the movable frame 6, in addition to the method described above. etc.), a hook is provided at the load detection end of the hook, a tensile force is applied to the hook by the elastic body 8, wire 17, and winding mechanism 11 described in the above embodiment, and the load is detected by the minute load converter. A method such as measuring the applied load using a general intensification device, recorder, etc. may be used.

In the above embodiment, first, the fixed frame 3 is adjusted using the adjustment screw 2 so that it is horizontal and the gap between the half cut surfaces of the movable cell 7 and the fixed cell 8 is zero. In this case,
The set screw 14 is loosened and the motor shaft 16 and pulley 13 are allowed to slide, so that no tension is applied to the wire 17 and the elastic body 18. Next, as shown in FIG. 4, an annular stopper 23 is fitted into the movable cell 7 and the fixed cell 8, and the movable cell 7 or the fixed cell 8 is firmly pressed by pressing at least one of the movable cell 7 or the fixed cell 8 with a push screw (not shown). After fixing the movable cell 7 to prevent it from moving, an annular guide tube 24 is placed over the entire sample cell (7, 8), and the sample powder P is filled. Next, as shown in FIG. 5, the sample powder P is pressurized using the pressurizing tool 25. The method of pressurizing is to press it manually or to pressurize it for an appropriate time using a pressurizing odor 25 of known weight and a weight. Next, as shown in Fig. 6, the pressure shell 25 and guide tube 24 used in Figs. 7, 8) complete the filling of the sample.
Next, one end of the elastic body 18 is connected to the hook 19, and the set screw 14 is tightened to the motor 16, so that the pulley 13 is held between the motor shaft 16 and the washer 15. Note that the elastic body 18 has no elongation and no initial tension is applied to it.
Next, adjust the increase device 27 to remove the leaf spring 21 and the strain gauge 22.
The elongation of the elastic body 18 detected by The body 18 stretches, and the tension corresponding to this stretch acts as a force to separate the movable cell 7 from the fixed cell 8 via the hook 19, and the sample powder P in the sample cell (7, 8) is separated from the half part. When subjected to a force that causes them to be separated from each other, the resistance generated at that time is proportional to the amount of elongation of the elastic body 18, and as the tensile force is further increased, the sample powder P finally becomes as shown in FIGS. The sample powder is cut, and the maximum tensile force at this time is taken as the adhesion force of the sample powder. Figure 9 records the tensile drag force of the sample powder, with the horizontal axis showing the elapsed tensile time (seconds), the vertical axis showing the tensile force (bait) detected by the strain gauge 22, and a indicating the tensile drag force. The adhesion force of the sample powder P can be measured in this way.
For example, a so-called fine powder of heavy calcium carbonate with an average particle size of 23 microns and a water content of 0.4% (W.B) is used as the sample powder P, and it is divided into two circular parts with an inner diameter of 5 ribs and a depth of 2 ribs. The adhesion force measurement shown in the example of the present invention of the cell shows that the additional load is 50k9,
When the same load application time is 10 minutes, the tension time T shown in Fig. 9 is 27.0 seconds, and the peak a of the adhesion force is 38.183 g.
r, the measurement operation was carried out smoothly without slight vibrations, accurate and stable results were obtained, and no instability was observed as in the prior art. Note that the suspension member 5 in this embodiment has knife edges 5a and 5b at both ends thereof.
Although the explanation has been given of a support type equipped with a pin shaft or a ball bearing, various commonly used support types can be used. As described above, the adhesion force of various powders and granules is measured by the maximum tensile force of the two-divided cell, but according to the present invention, the movable cell 7 is moved through the movable cell 6,
Because it is suspended by the suspension member 5, there is no rolling friction that is unnecessary for measuring the tensile drag force and impedes the measurement accuracy against minute movements as described in detail above, and therefore highly accurate measurement. The results are obtained, extremely high-precision machining required for machining the ball bearing D and its rolling surface is not required, and the consolidation load is not required when filling the sample cell (7, 8) with the sample. In the case of a large size, the movable cell F is easy to move and difficult to handle, and even becomes impossible to measure using the follow-up method. Operation is simple and reliable, high-precision measurements can be made, and in addition, durability can be improved and the consolidation load can be increased, so the measurement range is expanded and more samples can be measured. The effects of the present invention on measuring the physical properties of powder and granular materials are significant, as it becomes possible to set measurement conditions in a wider range and the range of application is expanded.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part according to the prior art, FIG. 2 is a sectional view of a main part showing an embodiment of the present invention, FIG. 3 is a sectional view taken along line A-A' in FIG. 2, and FIGS. 6 and 7 are cross-sectional views of main parts for explaining the embodiments of the present invention, and FIG. 8 is a B--
The B view and FIG. 9 are measurement diagrams according to an embodiment of the present invention. In the figure, 1... Instrument stand, 3... Fixed frame, 5... Suspension member, 7... Movable cell, 8... Fixed cell, 11... Winding mechanism, 17... Wire, 18... Elastic body, 26... is a tensile force measuring device. Figure 1 Figure 3 Figure 6 Figure 2 Figure 4 Figure 5 Figure T Figure 8 Figure 9

Claims (1)

[Claims] 1. A fixed frame 3 disposed on the device stand 1, a half-cut fixed cell 8 fixed to the fixed frame 3, and a half-cut movable cell 7 that is movable as a pair facing the fixed cell 8. In the adhesion measuring device of the two-split cell type, which includes a winding mechanism 11 for the wire 17 for pulling the movable cell 7 and the tension measuring device 26, the movable frame 6 on which the movable cell 7 is arranged is The movable frame 6 is suspended by a plurality of suspension members 5 so that the movable frame 6 is movable only in the direction opposite to the fixed cell 8 from the upper end of the support column 4 fixed to the fixed frame 3. An apparatus for measuring the adhesion force of powder and granular materials.