JPH04309840A - Outer cylinder type rotary viscometer - Google Patents

Abstract

PURPOSE:To execute installation in simple manner by forming a constant temperature jacket to a container which can be separated from an outer cylinder and allowing each axis center of the outer and inner cylinders to coincide with each other. CONSTITUTION:As for an outer cylindrical rotary viscometer, the rotary shafts 2 and 4 of an inner cylinder 1 and an outer cylinder 3 are taken out into the upper parts, and supported, and the rotary shaft of the outer cylinder 3 is supported by using a large diameter bearing 7, and the rotary shaft 2 of the inner cylinder is inserted inside. A constant temperature jacket is installed as a container separated from the outer cylinder onto an elevator board, and when the outer cylinder 3 is connected with the rotary shaft 4, a tapered wedge 9 having cuts 10 alternately from the upper and lower parts is attached with an inner taper 8 formed on the rotary shaft, and tightening is performed by a tightening member 3.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] A coaxial double cylinder rotational viscometer is an outer cylinder rotational viscometer that measures the torque acting on the inner cylinder by rotating the outer cylinder, and a coaxial double cylinder rotational viscometer that measures the torque acting on the inner cylinder while the outer cylinder is fixed. They are broadly classified into internal cylinder rotational viscometers that also measure torque. The present invention
Of these, this relates to the external cylinder rotational viscometer, and in particular,
The present invention relates to the outer cylinder holding mechanism.

0002

BACKGROUND OF THE INVENTION Since viscosity is easily affected by temperature, the outer cylinder of a rotational viscometer is used in a constant temperature jacket. In this case, since the outer cylinder is fixed in the inner cylinder rotational viscometer, a normal constant temperature jacket can be used. However, in the case of an outer cylinder rotational viscometer, since the outer cylinder must be driven, it is customary to arrange an inner cylinder torque measuring mechanism in the upper part of the viscometer and an outer cylinder drive shaft in the lower part. In order to drive the outer cylinder from the bottom, the rotating shaft must pass through the constant temperature jacket, so the constant temperature jacket and the outer cylinder are constructed as one piece, which reduces the flexibility of the constant temperature jacket. The problem was that it was low.

[0003] Furthermore, since the constant temperature jacket and the outer cylinder cannot be easily separated, it is necessary to remove the outer cylinder for sample exchange by raising and lowering the inner cylinder. However, this requires making the inner cylinder torque measuring section, which is a sophisticated measuring device, movable, and is constrained by the design of the torque measuring section and the speed of sample exchange. In order to solve this problem, it is possible to take out the rotating shafts of both the inner cylinder and the outer cylinder upward, but in this case, it is possible to align the axes of the outer cylinder and the inner cylinder and easily install them. It is assumed that something is possible, and if it is not possible, it cannot be realized.

0004

[Problems to be Solved by the Invention] A technical problem of the present invention is to make the thermostatic jacket a simple container that can be separated from the outer cylinder, and to easily install the outer cylinder and the inner cylinder so that their axes coincide. This is intended to eliminate the various constraints mentioned above, and thereby improve torque measurement accuracy.

[0005]

[Means for Solving the Problems] In order to solve the above problems, the outer cylinder rotational viscometer of the present invention is a viscometer that measures the torque acting on the inner cylinder by rotating the outer cylinder. The rotating shaft is taken out and supported at the top of them, and a large-diameter bearing is used to support the rotating shaft of the outer cylinder, and the rotating shaft of the inner cylinder is inserted inside it.The constant temperature jacket is separated from the outer cylinder. When connecting the outer cylinder to the rotating shaft, taper wedges with alternating notches cut out from above and below are brought into contact with the inner taper provided on one side of the outer cylinder, and the outer cylinder is connected to the rotating shaft using a tightening member. This is characterized by the fact that by fastening them together, their axes are made to coincide.

[0006]

[Function] In order to make the constant temperature jacket a separate container from the outer cylinder and not expose the rotating shaft to the constant temperature jacket side,
It is necessary to take out the rotating shafts of the inner and outer cylinders from the top, but
This can be achieved because the outer cylinder is supported using a large-diameter bearing that allows the rotating shaft of the inner cylinder to pass through. However, in this case, a new problem arises:
It is necessary to easily mount the outer cylinder coaxially with the axis of the inner cylinder, but it is necessary to connect the rotating shaft and the outer cylinder with an inner taper provided on one side using a tapered wedge with alternating notches from above and below. Since the two shafts are fastened together through the two shafts, both shafts can be mounted coaxially with high precision by reducing the diameter of the tapered wedge during fastening.

[0007]

[Example] Figure 1 shows the overall configuration including the measurement system of a rotating outer cylinder type coaxial double cylinder rotational viscometer according to the present invention, and Figure 2 shows the exploded configuration of the outer cylinder support part of the same viscometer. It shows. This outer cylinder rotational viscometer supports the rotating shaft 2 of the inner cylinder 1 and the rotating shaft 4 of the outer cylinder 3 at the upper part, and the constant temperature jacket 5 supports the rotating shaft 2 of the inner cylinder 1 and the rotating shaft 4 of the outer cylinder 3.
The structure is such that the inner and outer cylinders 1 and 3 can be attached and detached by lowering the container as a simple container that can be separated from the inner cylinder.Therefore, the measuring system for the torque acting on the inner cylinder 1 and the drive system for the outer cylinder 3 are mounted on a frame (not shown). The constant temperature jacket 5 is placed on a lifting platform 6. Therefore, to replace the sample for measurement, the constant temperature jacket 5 is lowered by the lift table 6, and the outer cylinder 3 is removed downward.

In this way, the rotating shafts 2, 4 of the inner and outer cylinders 1, 3
In order to take them out to the upper part without exposing them to the constant temperature jacket 5 side, a large-diameter bearing 7 that allows the rotating shaft 2 of the inner cylinder 1 to pass inside is used to support the rotating shaft 4 of the outer cylinder 3. There is. This large-diameter bearing 7 is arranged so that its outer member is fixed, the outer cylinder 3 is attached to its inner member, and the bearing 7 is driven by a motor.

[0009] When the outer cylinder 3 is taken out with the rotating shaft 4 facing downward as described above, the problem of how to easily and coaxially attach the outer cylinder 3 to the rotating shaft 2 of the inner cylinder 1 is solved. There is a need. Therefore, as shown in detail in FIG. 2, the means for fixing the outer cylinder 3 to the rotating shaft 4 is to fasten the outer cylinder 3 to the rotating shaft 4 having an inner taper 8 using a tapered wedge 9. I try to let them do it.

This tapered wedge 9 has cutouts 10 alternately inserted from the top and bottom so that the diameter is reduced along the inner surface of the inner taper 8 during tightening. To fasten the outer cylinder 3 using the tapered wedge 9, the outer tapered surface 11 of the tapered wedge 9 is brought into contact with the inner taper 8 of the outer rotating shaft 4, the outer cylinder opening edge is inserted inside the tapered wedge, and the washer 12 is inserted. Tightening member 1 through
This is done by screwing in 3 and reducing the diameter of the tapered wedge. Such a tapered wedge 9 is extremely effective for easily aligning the axes of the two shafts to be connected, thereby facilitating high-precision connection between the outer cylinder 3 and the rotating shaft 4. Can be done.

The AC servo motor 15 constituting a drive system for driving the outer cylinder 3 is fixed to a frame (not shown) and is configured to drive the rotation shaft 4 via a toothed belt 16 with a belt drive. ing. This servo motor 1
5 is a pulse control method, and its driving is controlled by a control device. Further, a rotary encoder 17 attached to the servo motor 15 is connected to a control device to monitor the rotation of the outer cylinder 3. Further, the rotating shaft 2 of the inner cylinder 1 is supported by an air bearing 20, and a torque detecting device is disposed at the tip thereof. Thereby, the outer tube 3 can be removed and the sample replaced without moving the drive system or the torque detection device.

[0012] In the torque detection device attached to the above-mentioned outer cylinder rotational viscometer, in order to detect the torque transmitted to the inner cylinder 1 by the rotation of the outer cylinder 3, a method is adopted in which the torque is balanced with the magnetically generated torque. ing. When a magnet is placed in a uniform magnetic field, it is affected by a torque whose magnitude varies by the sin of the relative angle between the magnetic field and the magnet. Therefore, a magnet is attached to the rotating shaft 2 of the inner cylinder, and the magnet is controlled so as to face in a direction perpendicular to the magnetic field. This direction produces the most torque and has the least torque variation. The above magnetic field is
It is generated by an air-core solenoid coil.

Further, the direction of the inner cylinder 1 is detected by a differential transformer 21, and the current flowing through the solenoid coil is controlled by PID control so that the output of the differential transformer is always zero. This current is proportional to torque. Further, the temperature of the rotational viscometer is controlled by a combination of a constant temperature jacket 5 and an electronically cooled circulation temperature controller.

[0014]

Effects of the Invention As described above, according to the outer cylinder rotational viscometer of the present invention, the thermostatic jacket is made into a simple container that can be separated from the outer cylinder, and the axes of the outer cylinder and the inner cylinder are installed so that they coincide. can be easily implemented, thereby eliminating various limitations of the conventional example and improving torque measurement accuracy. Furthermore, the configurations of the outer cylinder and thermostatic jacket are simplified, and there is no need for complicated processing, so they can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the overall configuration including a measurement system of a rotating outer cylinder type coaxial double cylinder rotational viscometer according to the present invention.

FIG. 2 is an exploded half-sectional view of a main part of the outer cylinder support portion of the outer cylinder rotational viscometer of the present invention.

[Explanation of symbols]

1 inner cylinder,
2, 4 rotating shaft, 3 outer cylinder,
5 Constant temperature jacket, 6
Lifting platform, 7
Large diameter bearing, 8 internal taper,
9 Tapered wedge, 1
0 notch,
13 Tightening member.

Claims (1)

[Claims] Claim 1: In a viscometer that measures the torque acting on the inner cylinder by rotating the outer cylinder, the rotating shafts of the inner cylinder and the outer cylinder are taken out and supported at their upper parts, and the rotating shaft of the outer cylinder is supported by a Using a large-diameter bearing, the rotating shaft of the inner cylinder is inserted inside it, and the constant temperature jacket is installed on the lifting platform as a container separated from the outer cylinder, and when connecting the outer cylinder to the rotating shaft, An outer cylinder characterized in that the axes of the two are made to coincide by abutting tapered wedges with cutouts alternately from the top and bottom on the inner taper provided on one side and fastening them with a tightening member. Rotational viscometer.