JP2746566B2 - Fixed structure of pointer in viscometer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a pointer in a viscometer provided in a viscometer used for measuring the viscosity of a viscous liquid.

[0002]

2. Description of the Related Art Viscous liquids include, for example, adhesives,
There are various kinds of industrial products such as fillers and foods, but it is necessary to appropriately measure the viscosity of such viscous liquids when producing such viscous liquids, or when using such viscous liquids, and furthermore, at the time of controlling and adjusting. Occurs.

[0003] Conventionally, a viscometer for measuring the viscosity of such a viscous liquid has been known. As a known viscometer structure, for example, there is a structure as shown in FIGS. 3 to 5.

That is, in FIG. 3, reference numeral 1 denotes a viscometer, and the viscometer 1 is vertically held by a support 3 vertically supported by a stand 2 via a support 4 and a support rod 5. ing. From the lower surface of the viscometer 1, an output shaft 6 rotated by a motor incorporated in the viscometer 1 is expended, and an impeller 7 is attached to the lower end of the output shaft 6. Spindles 8 are connected by screwing means.

Therefore, by inserting the impeller 7 into a viscous liquid contained in the beaker 9 and rotating the impeller 7, the impeller 7 is rotated based on the rotational load of the impeller caused by the viscosity of the viscous liquid. It can measure the viscosity of a liquid.

Further, regarding the internal structure of the viscometer 1,
Referring to FIG. 4, the housing 10 of the viscometer 1 will be described.
Inside, a motor 11 and an intermediate output shaft 13 whose driving force is rotated at an appropriate speed via a speed reduction mechanism 12 and a coupling 22 are rotatably supported by a hollow shaft 14. A needle base 15 is fixed to the intermediate output shaft 13, and a needle holding rod 17 that holds a pointer (needle) 16 is fixed to the needle base 15.

The hollow shaft 14 is rotatably supported by a bearing 18 fixed to the housing 10, and a scale plate 19 is fixed to the hollow shaft 14. An outer end of a spiral spring 20 is fixed to the scale plate 19, and an inner end of the spiral spring 20 is fixed to a needle base 15 fixed to the intermediate output shaft 13.

Reference numeral 21 denotes a holder center which is positioned concentrically with the intermediate output shaft 13, and the holder center 21 is engaged with a scale plate 19 via a holder guide 23 and a connecting pin 24. .

A lower end of the intermediate output shaft 13 is connected to a pivot bearing 25 which is integrated with the holder center 21.
Thus, the output shaft is supported so as to reduce the supporting load. Further, the lower end of the intermediate output shaft 13 is connected to the output shaft 6 via a connecting member 26.

A clutch guide 27 is fixed to the upper end of the bearing 18 at a concentric position. The operation piece 2 is provided in a circumferential groove 28 formed around the clutch guide 27.
9 is loosely fitted, and the operation piece 29 is attached to the tip of a clutch operation rod 31 that leverages with a support shaft 30 attached to the housing 10 as a fulcrum.

As shown in the enlarged cross-sectional view of FIG. 5, an upper peripheral edge of the scale plate 19 is formed with an uneven portion 32 having a mountain-shaped cross section. A hollow shaft having a knife edge 33 corresponding to the unevenness 32 and supporting the scale plate 19 via the operation piece 29 and the clutch guide 27 by operating the clutch operating rod 31 in the direction of the arrow (a). 14 is pulled up against the resilient pressure of the spring 34, whereby the scale 19
Rises, and the unevenness 32 formed on the upper peripheral edge of the scale plate 19 and the knife edge 33 formed on the needle holding rod 17 are engaged, and the scale indication value by the pointer 16 is fixedly displayed. As a result, the viscosity measurement value can be confirmed. If the clutch operating rod 31 is restored, the scale plate 19
Is depressed by the restoring force of the spring 34, and the engagement between the unevenness 32 and the knife edge 33 is released.

[0012]

However, in such a conventional structure for indicating the measured viscosity by the scale plate 19 and the pointer 16 using a viscometer, the engagement means between the scale plate 19 and the pointer 16 at the time of viscosity measurement is used. In addition, a processing step for forming a mountain-shaped unevenness 32 on the peripheral portion of the surface of the scale plate 19 is required, and a processing for forming a knife edge 33 engaged with the unevenness 32 on the needle holding rod 17. Since the steps are required, the cost of the entire viscometer is increased due to the necessity of these processing steps, and the productivity is lowered.

In the conventional viscometer, the operation for engaging and holding the scale plate 19 and the needle holding rod 17 is performed by moving the clutch operating rod 31 in the direction of arrow (a) to raise the scale plate 19. Since the unevenness 32 formed on the scale plate 19 and the knife edge 33 of the needle holding rod 17 are engaged (engaged) by this, for example, the elastic pressure of the spring 34 is applied to the scale plate 19. When an excessive lifting force acts on the needle holding rod 17 and the scale plate 19 due to the excessive moving force of the scale plate, the needle holding rod 17 and the scale plate 19 may be deformed. There is a problem that the engagement of the knife edge 33 with the knife edge 33 becomes impossible.

The present invention has been made in view of such a problem, and has been developed in a conventional viscometer by improving means for holding (fixing) engagement between a scale plate and a needle holding rod. The fixing of the pointer in the viscometer which eliminates the factors of high cost and lower productivity, and prevents the deformation of the needle holding rod and the scale plate to improve the reliability and durability of the indicated value accuracy It is intended to provide structure.

[0015]

In order to achieve the above object, according to the present invention, at the lower end of a torsion bar suspended inside a vertical rotating cylinder rotated by a motor,
A pointer support cylinder for connecting and holding the spindle is suspended in a suspended state concentrically with the rotary cylinder, and a tubular graduation shaft is slid in the axial direction integrally with the rotary cylinder outside the rotary cylinder in a circumferential direction of the rotary cylinder. A graduation shaft and a flange with a friction pad attached thereto and a clutch guide are fixed to the graduation shaft, and a needle disk frictionally engaged with the friction pad is fixed to the pointer support cylinder. Is fixed to the needle disk, and a needle holding rod integrally provided with a needle pointing to the scale provided on the scale plate is fixed to the needle disk.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in FIGS.

Reference numeral 41 denotes a viscometer.
Corresponds to the viscometer 1 shown in the conventional example (FIG. 3), and the viscometer 41 also includes the stand 2, the column 3, the support 4, the support rod 5, and the like shown in FIG. That are held vertically through.

The viscometer 41 is rotated by a motor 43 located in the housing 42 to reduce the speed of the motor 44.
An output shaft 45 that is rotated at an appropriate rotation speed via
A hollow rotary cylinder 47 is fixed to the output shaft 45 via a joint member 46 on a vertical axis, and is integrally connected to the outer peripheral surface of the rotary cylinder 47 in the circumferential direction of the rotary cylinder 47. However, a tubular scale shaft 48 is fitted slidably in the axial direction.

The scale shaft 48 and the rotary cylinder 47 are
Bearing 49 provided integrally with upper housing 42
Are supported rotatably.

A clutch guide 50 is fixed to the outer periphery of the upper end of the scale shaft 48, and a flange 51 is fixed to the outer periphery of the lower end of the scale shaft 48. A friction pad 52 is attached to the lower surface of the flange 51.

Further, the scale shaft 4 is provided on the flange 51.
A scale plate 53 having a surface in a direction orthogonal to the axial direction of the scale 8 is fixed.

Numeral 54 denotes a screw shaft screwed to the upper end of the inside of the rotary cylinder 47. The screw shaft 54 has a torsion bar 55 (hereinafter referred to as a torsion bar 55) inserted into the rotary cylinder 47. The torsion bar is described as a piano wire 55).

Reference numeral 56 denotes a pointer support cylinder which is loosely inserted into a vertical shaft hole 58 formed in the center of the lower housing 57 of the viscometer 41. The upper end of the pointer support cylinder 56 The indicator 5 corresponding to the scale plate 53
A needle disk 61 to which a needle holding rod 60 that integrally forms 9 is fixed is fixed.

A chuck base 62 is provided inside the pointer support cylinder 56.
In the figure, a chuck 63 that is locked to the chuck base 62 in the upward direction is provided. The lower end of the piano wire 55 is connected to the chuck 63, and the pointer support cylinder 56 is suspended by the screw shaft 54 via the piano wire 55.

At the lower end of the pointer support cylinder 56, a balance weight 65, which is a means for applying tension to the piano wire 55 via a coupler 64, is attached. A center rod 66 is attached to the lower end of the pointer support cylinder 56, and the center rod 66 supports a spindle 67 similar to that shown in the conventional example.

In the shaft hole 58 of the lower housing 57,
Although the bearing 68 is provided, the bearing 68 is not always in contact with the outer periphery of the pointer support cylinder 56, and when the pointer support cylinder 56 generates a large swing in the radial direction, It is provided to suppress the swing.

An elastic spring 69 is interposed between the joint member 46 and the clutch guide 50, and the scale shaft 48 is pushed down by the elastic spring 69.

Numeral 70 denotes a clutch guide operating rod having an upper end protruding from the upper surface of the upper housing 42. When the clutch guide operating rod 70 is depressed, the lever rod 71 is rotated counterclockwise in FIG. , So that the clutch guide 50 and the scale shaft 48 are pulled up against the elastic force of the spring 69. In order to keep the clutch guide 50 and the scale shaft 69 pulled up, a notch 74 is provided at the upper end of the clutch guide operating rod 70 to be engaged with a hole 73 provided in the upper housing 42. With the clutch guide operating rod 70 pressed down, the notch 7
By engaging the hole 4 with the hole edge 73, the pulled up state of the clutch guide 50 and the scale shaft 69 is maintained.

Reference numeral 75 denotes a stopper pin protruding from the lower side of the scale plate 53.
By rotating the needle holding rod 60, the needle holding rod 60 does not have a rotation difference of 360 degrees or more with respect to the scale plate 53, thereby preventing excessive twisting of the piano wire. It is.

Next, in order to measure the viscosity of the viscous liquid with the viscometer having the above-described configuration, the clutch guide operating rod 70 is pushed down to raise the scale shaft 48, thereby releasing the contact between the friction pad 52 and the needle disk 61. .
Then, the spindle 67 is immersed in the viscous liquid in the beaker into which the viscous liquid as the sample is put, and the motor 43 is driven there. The driving force of the motor 43 causes the output shaft 45 to rotate at an appropriate speed via the speed reduction mechanism 44. As a result, the rotary cylinder 47 and the screw shaft 54 rotate. Both 48 and the scale plate 53 rotate at a constant speed.

A pointer support cylinder 56 and a spindle 67 suspended from the screw shaft 54 via a piano wire 55
Also tries to rotate following the rotation of the screw shaft 54,
Since the impeller 76 provided on the spindle 67 is immersed in the viscous liquid, the needle holding rod 60
Receives the load of the viscous liquid, the rotation of the needle holding rod 60 follows the screw shaft 54 with a delay due to the twisting action of the piano wire 55, and the amount of this delay corresponds to the scale plate 53 and the pointer 59. And the relative positional relationship is shown as a value of viscosity. At this time, when the engagement between the notch 74 of the clutch guide operating rod 70 and the hole edge 73 of the upper housing is released, the elastic force of the elastic pressure spring 69 causes the clutch guide 5 to move.
0 and the scale shaft 48 are pushed down, so that the friction pad 52 integral with the scale plate 53 is
The viscosity value of the viscous liquid can be read based on the positional relationship between the scale plate 53 and the pointer 59 at this time.

As described above, in the present embodiment, the scale shaft 4 is used as a means for positioning the scale plate 53 and the pointer 59.
A needle pad 61 corresponding to the friction pad 52 is provided on a peripheral edge of an upper end of the pointer support cylinder 56, and a scale is formed by a frictional force between the needle disk 61 and the friction pad 52. The shaft 48 and the pointer support cylinder 56 are connected so that the pointer 59 and the scale plate 53 are positioned. Therefore, in the present embodiment, an excessive force is not applied to the hands 59, the scale plate 53, and the like, as compared with the conventional structure in which the hands (needle holding rod) and the scale plate are directly meshed and connected. Thus, a viscometer excellent in measurement reliability and durability can be obtained without deformation of the pointer scale plate or the like.

A balance weight 65 is attached to the pointer support cylinder 56 hanging down by the piano wire 55, and the tension of the piano wire 55 in the thrust direction is applied to the piano wire 55 by the action of the balance weight 65. Thus, the linearity of the piano wire 55 is maintained, the axis of the pointer support cylinder 56 and the spindle 67 during rotation of the spindle 67 are stabilized, and even if the radial bearing is omitted, the spindle 67, the pointer support cylinder 56, the pointer 59, etc. Rotational runout can be prevented beforehand, and the visibility of the indication improves.

The elimination of the bearing structure of the pointer support cylinder 56 simplifies the internal structure of the viscometer, thereby providing a viscometer excellent in economy.

[0035]

As described above, according to the pointer fixing structure of the viscometer of the present invention, the scale shaft 48 and the pointer support cylinder 56 are brought into contact with the friction pad 52 and the needle disk.
The scale plate 53 and the pointer 59 are positioned without directly contacting the scale plate 53 and the pointer 59. The danger of deforming or damaging the 59 is eliminated, thereby providing an effect that a highly accurate measurement can be performed, and a viscometer excellent in reliability and durability can be provided.

In the present invention, since the lower end of the scale shaft 48 and the upper end of the pointer support cylinder 56 are concentrically connected to each other, the pointer support cylinder 56 can be provided without providing a radial bearing. Radial deflection (swing)
Can be suppressed, whereby the effect of simplifying the bearing structure and improving the economic efficiency can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a pointer fixing structure according to the present invention at the time of viscosity measurement.

FIG. 2 is a sectional view showing an embodiment of a pointer fixing structure according to the present invention when the pointer is fixed.

FIG. 3 is an explanatory view of an overall form showing a conventional viscometer.

FIG. 4 is a sectional view of an internal structure showing a conventional viscometer.

FIG. 5 is an enlarged sectional view taken along line AA in FIG. 4;

[Explanation of symbols]

41 Viscometer 42 Upper housing 43 Motor 44 Reduction mechanism 45 Output shaft 46 Joint member 47 Rotating cylinder 48 Scale shaft 49 Bearing 50 Clutch guide 51 Flange 52 Friction pad 53 Scale plate 54 ... Screw shaft 55 ... Torsion bar 56 ... Pointer support cylinder 57 ... Lower housing 58 ... Shaft hole 59 ... Pointer 60 ... Needle holding rod 61 ... Needle disk 62 ... Chuck base 63 ... Chuck 64 ... Coupler 65 ... Balance weight 66 ... Center rod 67 ... Spindle 68 ... Bearing 69 ... Spring pressure spring 70 ... Clutch guide operating rod 71 ... Lever rod 72 ... Support shaft 73 ... Hole edge 74 ... Notch 75 ... Stopper pin 76 ... Impeller

Claims (1)

(57) [Claims] 1. A pointer supporting cylinder (56) for connecting and holding a spindle (67) to a lower end of a torsion bar (55) suspended inside a vertical rotating cylinder (47) rotated by a motor (43). ) Is suspended in a suspended state concentrically with the rotary cylinder (47), and is integrally connected to the outside of the rotary cylinder (47) in the circumferential direction of the rotary cylinder (47), and in the axial direction. A tubular graduation shaft (48) fitted slidably is provided, and a graduation plate (53), a flange (51) to which a friction pad (52) is attached, and a clutch are provided at the lower end of the graduation shaft (48). Each of the guides (50) is fixed, and a needle disk (61) that is frictionally engaged with the friction pad (52) is fixed to the upper end of the pointer support cylinder (56).
1) A needle holding rod (60) integrally provided with a pointer (59) indicating a scale provided on the scale plate (53).
The fixing structure of the pointer in the viscometer characterized by fixing.