JPH053967Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a viscosity measuring device for measuring the viscosity of rubber, etc.

(Prior art and its problems) As a device for measuring the viscosity of rubber, etc., the viscosity of the sample is measured by rotating a rotor in a sample chamber containing the sample and detecting the torque at that time as the amount of displacement of the worm. There is a so-called Mooney viscometer that measures indirectly, but with conventional devices of this type, good sensitivity could not be obtained because the worm would not displace unless a considerably large torque was applied to the rotor. Further, since the worm must be supported via a spring so as to be displaceable in the longitudinal direction, a large space is required in the longitudinal direction of the worm.

To improve this, a support plate that supports the drive mechanism for rotating the rotor is rotatably supported around the axis of the rotor, and a load cell is used to detect the rotational torque transmitted from the rotor to the support plate. There is a viscosity measuring device (Utility Model Publication No. 53-42146) that measures the viscosity of the rotor. There was a problem that it was difficult to transmit the information to the load cell. That is,
The support plate often applied not only a normal force to the load cell but also irregular lateral shear forces at the same time. If the applied counter-torque is large and the capacity of the load cell is large, the effect of the above shearing force is small, but if the torque is small and a load cell with a small capacity is used, the effect of the above shearing force becomes large, making it difficult to perform accurate measurements. I couldn't do it.

(Purpose of the invention) The present invention has been made in view of the above circumstances, and it is an object of the present invention to eliminate the shear force applied to the load cell and accurately detect the counter torque applied to the rotor in a device for detecting the amount of rotation of the support plate. The purpose of the present invention is to provide a viscosity measuring device that can perform the following functions.

(Summary of the invention) The viscosity measuring device according to the invention includes a rotor that stirs a sample in a sample chamber, a drive mechanism that rotates the rotation axis of the rotor, and a rotor that is rotatably supported concentrically with the rotation axis of the rotor. , a support plate that supports the drive mechanism at a position eccentric from the rotation axis of the rotor;
A detection device that detects the amount of rotation of the support plate, and a transmission mechanism that connects the drive mechanism and the rotating shaft of the rotor are provided, and torque transmitted from the rotor to the support plate via the transmission mechanism is used to rotate the support plate. In a device that measures the viscosity of a sample by detecting the amount of movement, the amount of rotation of the support plate is accurately transmitted between the support plate and the detection device, but other movements of the support plate are eliminated. It is characterized by being connected via a rotation transmission mechanism.

(Example) Hereinafter, an example shown in the drawings will be described.

A sample chamber 1 of this viscosity measuring device T is formed into a hollow container shape by a pair of upper and lower dies 3 and 4, and a rotor 2 is provided inside. The upper die 3 is attached to the lower surface of a platen 6 fixed to a crosshead 5, and the lower die 4 is attached to the upper surface of a platen 8 fixed to a substrate 7. The upper and lower platens 6 and 8 are provided with heaters 9 and 9 for heating the sample in the sample chamber 1. The crosshead 5 is connected to the lower crosshead 11 by a support 10.
Both crossheads 5 and 11 are raised and lowered together with the upper die 3 by a cylinder 12.

A cylindrical rotating shaft 13 is provided below the sample chamber 1 . The rotating shaft 13 is rotatably supported by a bearing 15 inside a sleeve 14, which is a cylindrical support fixed to the lower surface of the substrate 7.
The rotating shaft 2a of the rotor 2 is fitted inside the upper part. This device is provided with a motor M as a drive mechanism for rotating the rotor. is attached to. That is, the support plate 16 is rotatably supported around the sleeve 14 provided concentrically with the rotation axis 2a of the rotor 2, and the motor M is eccentrically supported from the rotation axis 2a of the rotor 2 by the support plate 16. supported in position. The rotating shaft 2a of the rotor 2 is connected to the motor M by a transmission mechanism formed by meshing a gear 19 attached to the output shaft of the motor M with a gear 20 formed on the cylindrical rotating shaft 13.

FIG. 2 shows a mechanism for detecting rotational torque applied to the support plate 16. A bracket 21 is provided on the upper surface of the outer edge of the support plate 16, and the upper end is placed on the lower surface side of the substrate 7. The lower end of a fixed leaf spring 22 is connected to this bracket 21. A detection part 23a of a load cell 23 that detects the rotation of the support plate is in contact with the support plate 16 via a push rod, which will be described later. A display device 26 that digitally displays the viscosity of the sample according to the voltage of the sample is connected via an amplifier 27 to each display device 26 . Further, a calibration weight 28 is attached to the support plate 16 by a wire 30 engaged with a pulley 29.

FIG. 3 is an enlarged view of the support plate 16, in which a pivot bearing 35 is formed at a distance l from the rotation center O of the support plate 16, and the tip of the pivot bearing 35 is a pivot 36a. The formed push rod 36 is loosely fitted. A spherical recess 36b is formed at the center of the rear end of the push rod 36,
The detection portion 23a of the load cell 23, which has a small diameter spherical shape, is in contact with the recess 36b. A sponge 37 is stuffed around the push rod 36 inserted into the pivot bearing 35, and supports the push rod 36, whose tip abuts against the bottom of the pivot bearing 35, in a swingable manner. The center lines of the load cell 23 and the push rod 36 are perpendicular to a line connecting the rotation center O of the support plate 16 and the pivot contact point P of the pivot bearing 35. The pivot bearing 35 and push rod 36 constitute a rotation transmission mechanism 38 that accurately transmits only the rotation of the support plate 16 to a load cell, which is a detection device, and does not transmit lateral force.

Note that a rod 31 for extracting the rotor is slidably inserted into the interior of the cylindrical rotating shaft 13. The lower crosshead 11 is provided with an upwardly protruding block 32 so that the crosshead 11 can be raised to push up the rod 31 and remove the rotor 2 upward.

When using this viscosity measuring device T, first extend the cylinder 12 to raise the upper die 3 together with the crossheads 5 and 11, and then
The rotor 2 is pulled out upwards, and samples such as rubber are charged into both the upper and lower sides of the rotor in the sample chamber 1.
After setting the sample and rotor 2 in the sample chamber 1, the upper die 3 is lowered to seal the sample chamber 1, and the motor M is started. This causes the rotor 2 and the cylindrical rotating shaft 13 to rotate.

When the rotor 2 rotates in the sample chamber 1, a counter torque corresponding to the viscosity of the sample is applied to the rotor 2 and the cylindrical rotating shaft 13.
This torque is transmitted to the support plate 16 via gears 19 and 20 that constitute a transmission mechanism. That is, since a rotational torque corresponding to the viscosity of the sample is applied to the support plate 6, the support plate 16 rotates around the sleeve 14 against the restoring force of the leaf spring 22. In this case, since the support plate 16 rotates around the sleeve 14, that is, around the axis of the rotor 2, the driving force of the motor M is always transmitted to the rotor 2 in a favorable state regardless of the rotation of the support plate 16. Ru. The resistance force of the leaf spring 22 against the rotation of the support plate 16 increases proportionally according to the rotation angle of the support plate 16, and the support plate 16 rotates by an angle corresponding to the applied rotation torque, that is, the viscosity of the sample. do. The load cell 23 is pressed by the push rod 36, and a voltage corresponding to the viscosity of the sample is generated in the load cell 23, which is recorded on the recorder 25 and simultaneously displayed on the digital display device 26 as the viscosity of the sample.

In this viscosity measuring device T, a pivot bearing 35 is formed on the support plate 16, the tip part engages with this, and the shaft part is supported via a pivot type push rod 36 that is loosely fitted in the pivot bearing 35 so as to be able to swing freely. Since the rotation of the plate 16 is transmitted to the load cell 23, the load cell 2
3 is primarily subjected to only vertical forces.
The rear end of the push rod 36 is formed in the shape of a spherical bearing to avoid eccentricity, and is in contact with the detection section 23a of the load cell 23, so that only the vertical force is effectively transmitted in this portion as well. In this way, the push rod 36 is configured so as not to transmit lateral force from the support plate 16.
Since the load cell 23 is pressed through the load cell 23, no shear force is applied to the load cell 23, and accurate viscosity measurement can be performed.

FIG. 4 illustrates the contact portion between the support plate 16 and the load cell 23 of a conventional viscosity measuring device. In this example, the support plate 16 and the load cell 23 were in direct contact, so the The lateral movement applied a shearing force to the load cell 23, causing measurement errors. As described above, the device of the present invention can effectively prevent measurement errors caused by shear force. For example, if the distance D between the pivot bearing 35 and the tip of the load cell 23 is 30 mm, even if the support plate 16 shifts laterally by 0.02 mm, (0.02/30) x 100 = approximately 0.07%,
Even if there is a deviation of 0.1 mm, the error will only be (0.1/30) x 100 = approximately 0.3%.

FIG. 5 is a graph showing the performance of the viscosity measuring device. When a complicated force is applied to the support plate 16, a curve with many irregularities is obtained as shown in FIG. However, with this device, accurate curves like those shown in Figure 2(b) can be obtained, making it possible to measure viscosity with high precision.

FIG. 6 shows an embodiment different from the above, in which a pressing tool 40 and a string 41 are provided as a rotation transmission mechanism. That is, the load cell 23 is installed on the opposite side to the direction in which the support plate 16 rotates due to torque, and a plate-shaped pressing tool 40 is rotatably abutted on the detection portion 23a of the load cell 23. This pressing tool 40 is connected to a pressing point Q of the support plate 16 by a pair of strings 41 serving as a rotation transmission mechanism.
It is tied to Note that the line connecting the detection portion 23a of the load cell 23 and the pressurizing point Q and the line connecting the rotation center O of the support plate 16 and the pressurizing point Q are orthogonal to each other.

In this example as well, the rotation of the support plate 16 causes the string 41 to
Since only the tension generated in the load cell 23 acts on the load cell 23, no shear force is applied to the load cell 23, and measurement errors based on this can be prevented from occurring.

(Effect of the invention) As is clear from the above explanation, the viscosity measuring device according to the invention is supported through a rotation transmission mechanism that accurately transmits the amount of rotation of the support plate but eliminates any further movement. Since the plate and the detection device are connected, no shearing force is applied to the detection device such as a load cell, and by accurately detecting the counter torque applied to the rotor, it is an excellent product that can perform accurate measurements. Ta.

[Brief explanation of drawings]

Figure 1 is a sectional view showing an example of the viscosity measuring device according to the present invention, Figure 2 is an explanatory diagram of a mechanism for detecting rotational torque applied to the support plate, and Figure 3 is an enlarged view of the main parts. , FIG. 4 is a partial explanatory diagram of the conventional device, and FIGS. 5 a and b are graphs showing detection accuracy.
FIG. 6 is an explanatory diagram of a different embodiment. DESCRIPTION OF SYMBOLS 1... Sample chamber, 2... Rotor, 2a... Rotating shaft, 3, 4... Dice, 5, 11... Crosshead, 7... Substrate, 16... Support plate, 23... Load cell, 35... Pivot bearing, 36... push rod,
38, 38'...Rotation transmission mechanism.

Claims (1)

[Claims for Utility Model Registration] (1) A rotor that stirs a sample in a sample chamber, a drive mechanism that rotates a rotation shaft of the rotor, and a drive mechanism that is rotatably supported concentrically with the rotation shaft of the rotor, and a drive mechanism that rotates a rotation shaft of the rotor; The rotor includes a support plate that supports the mechanism at a position eccentric from the rotation axis of the rotor, a detection device that detects the amount of rotation of the support plate, and a transmission mechanism that connects the drive mechanism and the rotation axis of the rotor. In this apparatus, the viscosity of a sample is measured by detecting the torque transmitted to the support plate via a transmission mechanism as the amount of rotation of the support plate. 1. A viscosity measuring device characterized in that the viscosity measurement device is connected via a rotation transmission mechanism that transmits motion to the support plate, but eliminates other movements of the support plate. (2) The rotation transmission mechanism includes a pivot type push rod whose one end fits into a pivot bearing provided on the support plate and whose other end contacts the detection device as described in claim 1 of the utility model registration claim. viscosity measuring device. (3) The viscosity measuring device according to claim 1, which is a utility model and includes, as a rotation transmission mechanism, a pressing tool that contacts the detection device and a string connecting the pressing tool and a support plate.