JPH056522Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a flow tester that performs a so-called flow test in which a fluid to be measured is pushed out through a pore and the outflow characteristics of the fluid are tested.

B. Prior Art A flow tester is based on a mechanism in which the fluid to be measured in a cylinder is pressed by a plunger whose upper end is connected to a load lever.A load is applied by a weight or the like to the force point of the load lever, and the force is applied to the point of action. A connected plunger is of the type that pushes out the fluid to be measured within the cylinder. By the way, in conventional flow testers, the extrusion load of the fluid to be measured is adjusted by using a weight of, for example,
The weight is changed manually between kg and 500 kg each time.

C. Problems to be Solved by the Invention The conventional flow tester as described above has the following problems. That is, (1) Load changes are done manually, resulting in poor efficiency and operability.

(2) Replacing the weight is hard labor and involves danger.

(3) In order to obtain accurate data, it is necessary to check the weight value for each test, which is complicated.

The present invention provides a flow tester that solves these problems.

D Means for Solving the Problem The load lever includes a moving mechanism that moves the position of at least one of the fulcrum and the point of force relative to the point of action. Specifically, as a moving mechanism, a system using a screw feeding mechanism is practical.

E Action The position of the point of action of the load lever that applies a load to the fluid pressing plunger is fixed, and at least one of the position of the weight (force point) or the position of the fulcrum moves relative to this point of action, and the lever principle Since the force at the point of application changes and the extrusion load of the fluid is changed, the extrusion load can be arbitrarily changed within a certain range without replacing the weight.

F. Embodiments The embodiments shown in the drawings will be described in detail below.

FIG. 1 shows an overall schematic diagram of one embodiment of a flow tester according to the invention, and FIG. 2 shows a cross section of the fulcrum moving frame taken along line A--A of FIG.

In the figure, 1 is a load lever, and one end of this lever 1 is connected to a balance weight 3 via a pulley 2.
is suspended by rope 4. The load lever 1 is balanced with respect to the fulcrum by this balance weight 3.

A weight 5 is suspended on the same side of the load lever 1 as the balance weight 3, and is attached via a double pulley 6 and ropes 7, 7'. The attachment position of this weight 5 is the point of emphasis.

On the other hand, 8 is a support shaft of a moving support provided at the other end of this load lever 1;
It is movable within a long hole 9 bored in the longitudinal direction. As shown in FIG. 2, the movable support shaft 8 passes through the elongated hole 9 of the load lever 1 and is rotatably held in the fulcrum moving frame 10 like a bearing. Further, a screw hole 11 is provided in the center of the lower part of the fulcrum moving frame 10, parallel to the longitudinal direction of the load lever 1, and a screw culm 12, which is also arranged parallel to the longitudinal direction, is screwed into this screw hole 11. are doing.
This screw culm 12 is rotatably held by bearings 13 on both sides thereof, and one end thereof is connected to the output shaft of a pulse motor 14 disposed coaxially with the screw culm 12.

The pulse motor 14 is driven by a pulse motor drive circuit section 15 controlled by a control circuit 16.

17 is a rod connected to the load lever 1;
A plunger 18 is integrally attached to the lower part, and the plunger 18 is pressed into a vertically lower cylinder 21 while being restrained by a guide 19. Reference numeral 20 denotes an opening (nozzle) in the bottom surface of the cylinder 21, through which the fluid to be measured 22 pressed by the plunger 18 flows out. The descending speed of the plunger 18 corresponding to this outflow speed is measured by a detection mechanism (not shown).

The guide 19 restrains the rod 17 from vertically pressing the plunger 18 and prevents the load lever 1 from moving in the horizontal direction.
As a result, the horizontal displacement of the point of action caused by the rotation of the load lever 1 around the fulcrum appears as a horizontal displacement of the load lever 1 with respect to the movable support shaft 8, but the plunger Since the extrusion stroke of the fluid to be measured by 18 is about 2 cm at most, this horizontal deviation is so small that it can be ignored and does not significantly affect the test results.

23 is the load lever 1 which is tilted after pressing the fluid.
This is a load lever return mechanism (hydraulic actuator) that returns the load lever to its original position.

Next, the operation of this embodiment will be explained.

When a predetermined load value is input (set) to the control circuit section 16, the control section circuit 16 controls the pulse motor drive circuit section 15 to rotationally drive the pulse motor 14, and the movable support shaft is rotated by screw feeding of the screw culm 12. 8 to a predetermined position. Next, when the load lever return mechanism 23 is released, the load lever 1 pushes out the fluid to be measured 22 with a predetermined load through the rod 17 under the load of the weight 5, and a flow test of the fluid to be measured 22 is performed. The extrusion load can be further changed by inputting the control circuit section 16, or the loading speed in one test can be changed. In particular, in the illustrated example, measurement tests can be performed with continuously varying loads, which enables new measurement methods in flow testing and the study of flow characteristics and other properties of unknown fluids to be measured. We can provide you with a very convenient flow tester.

FIG. 3 shows a modification of the fulcrum moving mechanism of the above-described embodiment (the fulcrum bearing part is not shown). That is, the pulse motor 24 is attached directly to one end of the load lever 25, the screw culm 26 is rotationally driven by the pulse motor 24, and the position of the movable shaft 27 is displaced by screw feeding.

FIG. 4 shows the relationship between the movable support shaft 27 and a support bearing portion 28 that holds it so that it can slide in the horizontal direction. A long hole 29 is provided.
Note that the support bearing portion shown in FIG. 4 clamps the load lever shown in FIG. 3 from both sides, but these load levers are omitted for convenience of explanation. FIG. 5 shows a sectional view taken along the line B-B in FIG.
7 is held between both sides.

FIG. 6 shows an embodiment in which the weight side, that is, the point of effort moves. The load lever 32 is passed through the weight 31 to make it slidable, and a pulse motor 33 is directly attached to one end of the load lever 32. The pulse motor 33 rotates the screw culm 34, and the screw feeder rotates. As a result, the position of the weight 31 moves. The method of driving this pulse motor 33 can be the same as in the previous embodiment. Moreover, FIG. 7 shows a CC sectional view in FIG. 6. Reference numeral 35 denotes a screw hole member for feeding the screw, which is provided with a screw hole 36 so as to be screwed into the screw culm 34, and is fixed to the weight 31 with a bolt 37.

Although the embodiments of the present invention have been described above, the mechanism for moving the fulcrum or force point (weight) is not limited to screw feeding, and for example, a pinion/rack mechanism may be used. Further, the plunger 18 of the fluid-to-be-measured pushing portion may be shaped like a piston. Further, the load lever return mechanism 23 is not limited to a piston type, but may be a cam type.

Further, although the fulcrum moving mechanism and the weight moving mechanism are shown separately in the embodiment, it is also possible to provide a flow tester that includes both of these two moving mechanisms.
In this case, the combination of the two mechanisms realizes more fine and wide-ranging load adjustment.

G. Effect of the invention The flow tester provided by the invention is as detailed above, so it is possible to easily, safely and quickly set the fluid extrusion load to any value within a certain range, and When trying to apply a load that exceeds this predetermined range, it is necessary to replace the weight separately, but since the range of loads that can be taken by a single weight is wide, it is easier to replace than with conventional ones. The frequency is extremely low, and a flow tester with excellent operability and practicality can be provided.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing the entire configuration of an embodiment for moving a fulcrum, FIG. 2 is a sectional view taken along line A-A of a movable fulcrum frame, and FIG. 3 is a diagram showing a modification of the fulcrum moving mechanism. FIG. 4 is a diagram showing the relationship between the support bearing part and the movable support shaft in the modification, FIG. 5 is a sectional view taken along line B-B of the movable support shaft in the modification, and FIG. FIG. 7 is a diagram showing an embodiment of the method of moving the position. FIG. 7 is a cross-sectional view taken along the line C--C in FIG. 6. 1, 25, 32...Load lever, 5, 31...
Weight, 8, 27...Movement shaft, 11, 30, 36
...Screw hole, 12, 26, 34 ...Screw culm, 1
4, 24, 33... Pulse motor, 15... Pulse motor drive circuit section, 16... Control circuit section, 18
... Plunger, 20 ... Hole (nozzle), 21
……Cylinder.

Claims (1)

[Scope of utility model registration request] A flow test of the fluid to be measured is performed by pressing the plunger into the cylinder through the action point of the load lever, which swings around the fulcrum when a load is applied to the force point, and pushing out the fluid to be measured in the cylinder from the pore at the bottom of the cylinder. A flow tester comprising: a moving mechanism for moving at least one of a fulcrum and a point of force relative to a point of action of the load lever.