JP2980968B2 - Viscoelastic body stress measuring device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a stress measuring device for measuring a stress generated when a viscoelastic substance such as rubber is continuously sheared,
In particular, the present invention relates to a stress measuring device capable of automatically setting a sample and removing and discarding the sample after the test.

(Prior art) The performance of rubber products depends on the properties of raw materials and compounded rubber,
It is greatly affected by its plasticity, viscosity and elasticity. Therefore, when manufacturing, evaluating, and conducting research and development of an elastomer alone or a rubber composition, it is necessary to measure the properties of a substance serving as a material and obtain accurate information on the workability thereof.

As a device for measuring the viscosity of viscoelastic substances such as rubber,
There is a rotating disk viscometer invented by M. Mooney 60 years ago. This device is used to obtain an index of the processability of an elastomer such as rubber, and is still widely used in the rubber industry. ASTM, ISO, etc. are standardized all over the world. In Japan, JIS K6300 standardizes the measurement of physical properties using a Mooney viscometer as an unvulcanized rubber physical test method.

(Problems to be solved by the invention) The Mooney viscometer is a so-called rotor type,
13 (a), a rotor 101 driven by an electric motor and a test piece are put into a hollow cylindrical sample chamber 103 defined by upper and lower dies 102a and 102b, and the rotor 101 is rotated in one direction. Then, the reaction torque acting on the rotor shaft 101a is measured. This Mooney viscometer is widely used and widely used, and has been improved year by year.However, there is no change in the use of a rotor, and therefore, the measurement data varies due to the bending of the rotor shaft. The meter uses at least two or more rotors in one tester because of the necessity of preheating etc. in consideration of workability, so that the measurement data varies due to the variation between rotors, especially the Mooney scorch test. When performing the test, the side and surface of the rotor are damaged in the process of removing the sample from the rotor after the end of the test, and the measurement data will vary. The aging and frictional force of the O-ring sealing the rotor shaft will occur. As a result, there is a problem that the measurement data varies. For this reason, the accuracy of the measurement data is maintained by increasing the number of man-hours required for the testing machine including the rotor.

In addition, in order to evaluate the workability of the sample, a method of converting data on the number of rotations of the rotor and the counter torque acting on the rotor shaft measured by a Mooney tester into a shear rate (γ) and a shear stress (s) has been performed. ing. In this case, it is necessary to reliably apply a shear to the sample without slippage of the rotation of the rotor, and to accurately detect a shear stress acting on the sample as a counter torque. FIG. 13 (b) is a graph showing the shear rate (γ) applied to the sample of the Mooney viscometer shown in FIG. 13 (a), and the horizontal axis represents the distance (r) from the center of the rotor. Sample room
The sample accommodated in 103 is divided into characteristic regions as shown by symbols a, b, and c in FIG. 13 (c), and the shear rate and the shear stress are separately measured for each region. The shear rate γ _a is the shear rate applied to the sample in the area a shown in FIG. 13 (c), and γ _b is the shear rate applied to the sample in the area b. Since the inner surfaces of the upper and lower dies and the entire outer peripheral surface of the rotor are provided with anti-slip grooves, the rotation of the rotor reliably applies shear to the sample, thereby causing the shear stress generated in the sample to be opposite to the rotor shaft 101a. It is transmitted as torque. However, in the apparatus shown in FIG. 13, there is no appropriate calculation formula of the shear rate for the sample in the region c, and since the sample in this portion does not directly contact the rotor, it is considered that it does not directly contribute to the torque. However, there is a disadvantage that the shear stress of the sample in this region cannot be detected.

In order to solve these problems, the present applicant has filed Japanese Patent Application No. Hei.
No. 73245 proposes a rotorless viscoelastic body stress measuring device, but the sample after the test is often still in an unvulcanized state, and it has been difficult to automatically detach the sample from the device.

In this regard, Japanese Patent Application Laid-Open No. 60-120253 discloses a system for automatically setting a sample and removing the sample after the test in a curing degree test apparatus. Even if the system is applied to vulcanized or semi-vulcanized rubber, etc., there is a difference between the completely cured sample and the unvulcanized or semi-vulcanized state after the test, which is the subject of this system, There is a problem that it is difficult to discharge the sample later.

An object of the present invention is to solve the above-mentioned problems and to provide a viscoelastic body stress measuring device capable of automatically measuring the stress of a viscoelastic body regardless of the state of a sample.

(Means for Solving the Problems) The stress measuring device for a viscoelastic body of the present invention defines a part of a sample chamber that accommodates a viscoelastic body whose stress is to be measured and that is coaxially opposed to each other. A stress measuring device comprising an upper die and a lower die, and a mechanism for imparting a rotational motion to one of the upper die and the lower die, and detecting a torque on the other die; An outer cylinder die is provided on the outer periphery of the outer cylinder die, and a surface defining a part of the sample chamber of the outer cylinder die is subjected to a slip prevention process with the sample, and the diameter of the rotating die is made larger than the diameter of the outer cylinder die. To be large, a fixed die is provided on the outer periphery of the die on the rotating side, and a part of the inner surface of the fixed die is configured to define a side surface of the sample chamber. And a plurality of positions in communication with the sample chamber. The apparatus is characterized in that it has an opposing groove and a sample desorption device for automatically supplying, discharging, and discarding the sample to and from the sample chamber.

(Operation) In the above-described configuration, by providing a plurality of opposing grooves over the outer periphery of the outer die or the inner periphery of the fixed die outside the outer die, or both, the test is always performed toward the outer die. It was confirmed that the sample after the completion was left. Also, it was confirmed that, when the contact area of the protruded rubber was set to be larger on the outer cylinder die side, the rubber remained on the outer cylinder die side similarly to the sample after the test. In the sample desorption device after the test is completed, the sample after the test is in an unvulcanized state. It became possible to discharge without leaving the test machine.

When an annular inclined structure with favorable conditions described in JP-A-60-120253 is provided on the outer cylinder die side, the sample after the test may be in an unvulcanized state or a semi-vulcanized state. Therefore, even when the above-mentioned gripping tool is used, the adhesive force is too strong to be detachable. Further, by making the die constituting the bottom surface of the sample chamber on the concave side movable in the direction of zero depth, the unvulcanized sample can be further easily attached and detached.

The present invention solves the automatic discharge and disposal of a sticky sample and supplies the sample by a program sequence pre-installed.
It is possible to fully automate a series of operations of test-sample discharge-sample disposal.

(Example) Hereinafter, an actual example will be described.

First, as shown in FIG. 1 (a), a main part of the stress measuring device of the present invention is located at a position facing each other on a coaxial line and defines a part of a sample chamber for accommodating a viscoelastic body whose stress is to be measured. An upper die 81 and a lower die 82 to be formed, and a mechanism for imparting a rotational movement to one of the upper die and the lower die (the upper die in FIG. 1), and the other die (the lower die in FIG. 1). In the stress measuring device for detecting the anti-torque applied to the torque, the outer die 83 is attached to the outer periphery of the die 82 on the side for detecting the torque.
The surface of the outer cylindrical die 83 that defines a part of the sample chamber is subjected to slip prevention with the sample, and the die on the rotating side is provided.
The diameter of 81 is larger than the diameter of the outer die 83,
A fixed die 17 is provided on the outer periphery of the rotating die 81, and a part of the inner surface of the fixed die 17 is configured to define a side surface of the sample chamber. In FIG. 1 (a), reference numeral 84 denotes a fixed die, and reference numeral 86 denotes a seal disposed between the outer cylindrical die 83 and the die 82 on the torque detecting side.

Further, as shown in FIG. 2A, an opposed groove 115 communicating with the sample chamber is provided on the inner periphery of the fixed die 84. The facing groove 115 is provided so that the sample always remains on the outer die 83 side when the sample chamber is opened after the test. That is, a part of the sample enters the opposed groove 115 due to the heat in the sample, forming an ear portion and connecting the sample and the fixed die 84,
When opened, the sample can be left on the outer die 83 side. In addition,
As shown in FIG. 2 (b), the position of the opposed groove 115 extends over the inner periphery of the fixed die 84 and the outer periphery of the outer cylindrical die 83.
115 can be provided, but any of them must be provided on the detection die 82 at a position which does not affect the shear rate of the sample.

In the present embodiment, the lower die 82 which has
An outer cylinder die 83 is provided on the outer periphery of the (die for detecting torque), and the surface defining the sample chamber of the outer cylinder die 83 is subjected to slip prevention processing. That is larger than the diameter of the outer cylindrical die 83, and by configuring the upper fixed die 17 so as not to rotate,
As shown in FIG. 1 (b), no slippage occurs between the sample and the die surface near the outer periphery of the die for detecting torque (the lower die 82 in FIG. 1 (a)). Disturbance of the shear rate applied to the sample does not occur throughout the lower die to be detected. Therefore, a shear rate j (j = ωr / h) determined by the sample thickness (h), the rotation speed (ω), and the radius (r) of the lower die can be directly given to the sample.

In another example of the present invention, as shown in FIG. 3 (a), an outer cylindrical die 83 is configured so that a lower die 82 is rotationally displaced at the same angle in the same direction by a shear stress received from a sample. I have. The arrangement and the like of the facing groove 115 are the same as in the above-described embodiment. That is, for example, in FIG. 3A, the outer cylindrical die 83 is configured to extend downward by the length 1 with the thickness t and to be fixed to the substrate 42. Reference numeral 85 denotes a seal disposed between the fixed die 84 and the outer die 83. In the stress measuring device of the first invention described above, the lower die 82 for detecting the torque receives the shear stress of the sample to obtain the stiffness value of the structure constituting from the lower die 82 to the torque detector and the stiffness value of the torque detector. A corresponding rotational displacement occurs, at this time, FIG. 1 (a)
As shown in the figure, when the outer cylinder die 83 is fixed, the torque detector detects a value obtained by subtracting the elastic deformation torque or the friction torque of the seal due to the rotational displacement of the lower die 82 from the actual value. In some cases, a correct value cannot be measured. Therefore, in the stress measuring device of the second invention, as shown in FIG. 3 (a), the length of the outer cylindrical die 83 is displaced by the same angle as the lower die 82 is rotationally displaced by the shear stress received from the sample. The lower die 82 and the outer cylinder die 83 are rotationally displaced in the same phase by installing the outer cylinder die 83 having the same rigidity value by adjusting the thickness l and the thickness t, so that the seal 86 affects the torque. Can be eliminated. Therefore, unlike the conventional apparatus, it is not necessary to largely expose the seal causing the slip of the sample into the sample chamber, thereby reducing the gap between the lower die 82 and the outer die 83 and eliminating the slip of the sample. Therefore, the shear stress can be measured more accurately. FIG. 3 (b) shows the relationship between the shear rate and the die radial direction in the stress measuring device of the second invention.

FIGS. 4 (a) and 4 (b) are a cross-sectional view and a plan view showing an embodiment of the viscoelastic body stress measuring device to which the sample chamber or the like having the above-described configuration is applied, excluding a sample detaching device.

The motor 1 is mounted on a vertically movable first substrate 2 via a support 3, and its rotation is transmitted to a spur gear 5 via a shaft 4. The spur gear 5 further meshes with a spur gear 7 provided on an outer peripheral portion of a shaft 6 attached to a central portion of the first substrate 2 so as to be movable in a vertical direction. The shaft 6 has a substantially hollow cylindrical shape, and has a projection 6a at a lower portion. The hollow part of the shaft 6 houses an upper die holder 8 having a heater block 9 attached to a lower end. An upper rotating die 11 is further connected to the lower end of the shaft 6, and the flange 11 a of the upper rotating die 11 and the bottom of the protruding portion 6 a of the shaft 6 are fixed with screws 10. Therefore, the rotation of the motor 1 is controlled by the shaft 4 and the spur gear 5.
, 7 and the upper rotary die 11 via the shaft 6, and the shaft 6 and the upper rotary die 11
And around the heater block 9.

Bearing case between the shaft 6 and the first substrate 2
The outer flange portion 12a of the bearing case 12 is fixed to the lower surface of the first substrate 2 with screws 13. The bearing case 12 is connected to the shaft 6 via a slide bearing 14 at an upper end thereof and via a slide bearing 15 at a lower end thereof.
Further, the upper surface of the protruding portion 6a of the shaft 6 and the bearing case 12
Thrust bearing 16 between inner flange 12b
Is provided. The engaging part 12 is provided on the outer peripheral surface of the bearing case 12.
c, and a thread groove is formed inside the
The upper part is screwed into this and fixed. Upper fixed die
17 has a step 17a, the lower end of which is an upper rotary die 1
The bottom surface of the upper die 1 and the inner peripheral surface of the lower end of the upper fixed die 17 define a part of the sample chamber 18. An O-ring 19 is used to seal between the outer peripheral surface of the lower end of the upper rotating die 11 and the inner peripheral surface of the lower end of the upper fixed die 17, so that the sample chamber is closed.
The sample is prevented from leaking from 18.

A heater block 9 is attached to a lower end of the upper die holder 8 via a heat insulating member 20.
An electric heater 21 is buried in the vicinity of the lower end. A temperature detector 22 is mounted through the center of the upper die holder 8, the heat insulating member 20, and the heater block 9, and the tip of the temperature detector 22 reaches a receiving portion 11b provided at the center of the inner bottom surface of the upper rotary die 11. An injection port 23 is provided in the upper part of the upper die holder 8, and a conduit 23a is formed up to a gap between the upper die holder 8 and the shaft 6, so that the heater block 9 and the upper rotary die 1 are formed.
It is configured so that a heat medium can be injected into the gap between the heat medium and the heat medium. In this example, a silicone oil having high heat resistance and being chemically stable is used as the heat medium. A discharge port 24 is provided at the upper part of the upper rotary die 11 so as to discharge the overflowed silicone oil. Further, the inner surface of the step of the upper fixed die 17 receives the silicone oil discharged from the discharge port 24. Thus, the groove 17b is provided along the circumference of the step 17a. The groove 17b
The silicone oil accumulated in the chamber is discharged from the discharge port 17c to the outside. Reference numeral 24 denotes a lead wire connected to the heater 21.

A flange portion 8a is provided at an upper end portion of the die holder 8,
It is connected to the upper end of the shaft 6 via a bearing 25. As is clear from FIG. 2 (b), the upper die holder 8
The arm 26 has screws 26a and 26b
The arm 26 is further attached to the first substrate 2
It is pivotally attached to a shaft 27a of a cylinder 27 installed above. By driving the cylinder 27, the arm 26 is swung about the axis 26c so that the upper die holder 8, the shaft 6, and the upper rotary die 11 can be moved in the vertical direction.
The sample chamber 18 can be easily taken in and out, and the sample chamber 18 can be easily cleaned.

Stand 28 at the height where the lowermost end of upper fixed die 17 is located
a is set, and the second substrate 28 is supported. A rod-shaped stand 2a supporting the first substrate 2 extends downward through the second substrate 28, and the lower end of the stand 2a is fixed to a connecting plate 29 connected to a shaft of a cylinder 30. I do. The first substrate 2 together with the components constituting the upper die and the motor 1 and its support 3 by driving the cylinder 30
Is configured to be able to move up and down. Thus, the sample chamber 18 can be accessed. The stand 28a supporting the second substrate 28 is fixed to the floor and is immobile. At the center of the second substrate 28, a lower fixing die 31 is fixed to the flange portion 28b of the second substrate 28.

A stand 42a is further fixed to the lower surface of the second substrate 28, and the third substrate 42 and the fourth substrate 45 are attached to the stand. The free end of the lower outer die 33 is disposed inside the lower fixed die 31 via an O-ring 32, and the lower end of the lower outer die 33 has a flange portion 33 a formed of a third substrate 42.
Fixed to. A lower die 35 is further installed inside the lower outer die 33 via an O-ring 34. The lower die 35 is fixed to a torque detector 50 fixed to the fourth substrate 45 via a heater block 35a, a heat insulating material 43, and a holder 35b. A bearing 33b is arranged between the outer periphery of the lower die holder 35b and the inner peripheral surface of the lower outer cylinder die 33. Torque detector 50
The torque detected at is recorded by the recorder 51. An arm 4 is provided on the outer periphery of the lower outer die 33 and the outer periphery of the lower holder 35a.
6 and 47 are provided, and a small displacement meter 4
8 is attached so that the difference in the amount of displacement of the sample between the lower outer cylinder die 33 and the lower die 31 due to the shearing force, that is, the difference in the amount of rotation, can be enlarged and verified.

In the lower fixed die 31 and the lower die 35, an electric heater 36 is provided.
37 are embedded therein, and the lower fixed die 31 and the lower die 35 are heated and controlled by a control device (not shown) in order to keep the temperature of the sample in the sample chamber 18 at the test temperature. Code 38, 39
Is a lead wire connected to the heaters 36 and 37, and reference numerals 40 and 41 are temperature detectors of the lower fixed die 31 and the lower die 35, respectively.

The sample is accommodated in the sample chamber 18 defined by the upper rotating die bottom surface, the upper fixed die inner side surface, the lower fixed die upper surface, the lower outer die upper surface, and the lower die upper surface, and the temperature detectors 22, 40, 41
In order to control the heating of the heaters 21, 26, 37 by a temperature control mechanism (not shown), the sample is heated to a predetermined test temperature. After this heating, the motor 1 is driven and the upper rotating die 11 is rotated to apply a shear to the sample. The sample gives a shear stress to the lower die 35 and the lower outer die 33, and a rotational deformation is generated in the lower die 35 and the lower outer die in proportion to the shear stress. Is generated, and the torque signal is amplified via a signal amplifier (not shown) and recorded by the recorder 51. The lower surface of the upper rotating die 11 and the lower surface of the lower die 35 and the upper surface of the lower outer die 33 which define the sample chamber 18 are provided with grooves for preventing slipping, and the upper fixed die 17 does not rotate. In addition, for the reason described below, since there is no influence on the torque of the seal 34, the area where the seal 34 is exposed to the sample chamber 18 can be reduced, so that the sample slips on the surface of the lower die 35. Does not occur, and a shear rate without disturbance can be given to the sample. Further, a lower outer die 33 is provided outside the lower die 35, and when the upper rotary die 11 is rotated, a torque detector 50 due to shear stress received from the sample is provided.
And the amount of deformation generated in the lower die 35 due to torsional deformation such as
The lower outer cylinder die 33 is configured to have the same torsional deformation amount that is distorted by the shear stress received from the sample. Therefore, the pure rotational torque received from the sample can be accurately measured without being affected by the elastic deformation torque or the friction torque of the seal 34.

To change the sample, drive the cylinder 30 to
The first substrate 2 and the upper die connected to the first substrate 2 are moved upward, and the sample is removed by a sample desorption device described later. As described above, the cylinder 27 installed on the first substrate 2 is driven to drive the upper die holder 8, the shaft 6,
By moving the upper rotating die 11 upward, the sample in the sample chamber 18 can be replaced more easily. When the cylinder 27 is returned to the original position, the thrust bearing
16 is determined by the position where it abuts against the flange of the bearing case 12. To change the height of the sample chamber, the fixing screw 12c that fixes the upper fixing die 17 to the bearing case 12 is used.
And loosen.

FIG. 5 is a cross-sectional view showing a modified example of the present invention excluding the sample attaching / detaching device. In this variation, the upper die portion is 2
This is a structure in which power is supplied to the heater of the upper die using a slip ring instead of a double structure, and the configuration in which a lower outer cylindrical die is provided outside the lower die is the same as that of the first embodiment. . Therefore, description of the lower die portion is omitted.

The rotation of the motor 1 is transmitted to the shaft 6 by the spur gears 5 and 7, and the upper rotating die 11 is rotated via the shaft 6.
The bottom surface of the flange portion of the shaft 6 and the flange portion 11a of the upper rotary die 11 are fixed by screws 10a via a heat insulating member 20a. Inside the rotary die 11, a heater block 11a having a heater 58 disposed at the bottom is attached, and the heater block 11a rotates together with the rotary die. The shaft 6 is formed in a hollow cylindrical shape, and two slip rings 52a and 52b are fitted on an upper portion thereof via an insulator 53a. A cover 54 surrounding the slip rings 52a, 52b and the insulator 53a is mounted on the upper outer periphery of the shaft 6 via a bearing 55, and carbon brushes 56a, 56b are penetrated into the cover, and attached to the slip rings 52a, 52b, respectively. In contact. The periphery of the through hole for attaching the carbon brushes 56a and 56b is covered with an insulating member 53b. A part of each of the slip rings 52a, 52b is protruded into the shaft 6, and is connected to an electric heater 58 mounted on the bottom of the heater block 11a via lead wires 57a, 57b. A hole 60 for accommodating the heat medium 59 and the temperature detecting device 61 is formed in the center of the heater block 11a, and the hole 60 extends to the rotary die 11. The cover 54a is put on the cover 54, and the temperature detecting device 61 is inserted from the center to the bottom of the hole 60 provided in the heater block 11a, and the tip is fixed to the center of the lid 54a. A bowl-shaped receiving portion 60a is provided above the hole 60 provided in the heater block 11a, and a heat medium is stored in the receiving portion 60a and the hole 60.

In the above embodiment, a silicone oil may be used as the heat medium. In this case, for example, when a low melting point metal such as wood metal is used, the motor 1 is driven after the wood metal is melted to some extent in order to avoid overheating of the motor 1 and damage to each part.
Need to be rotated. Temperature detector 61
Is originally mounted to detect the temperature on the sample surface of the upper die, but by detecting the temperature of the heat medium 59, the control device (not shown) makes the temperature of the heat medium 59 lower than a predetermined value. In such a case, the motor 1 is controlled so as not to be driven.

Hereinafter, with reference to FIG. 6 to FIG. 10, the sample desorption device of the stress measurement device of the present invention will be described.

Supply of sample to sample chamber and discharge of sample from sample chamber,
The disposal operation is performed by using an articulated industrial small robot 127 as shown in FIG. 6, for example. The sample is supplied by, for example, holding the sample on the rotating sample stage 126 with the sample gripper 12 of the robot 127.
Grab with 1 and place on the die in the sample chamber to start measurement. The die in the sample chamber is, as described above, the outer periphery of the outer cylinder die or the fixed die on the outer cylinder die side so that the sample always remains on the outer cylinder die 83 when the sample chamber 18 is opened after the test is completed. A plurality of opposed grooves are provided over the inner circumference or both. First
2 (a) shows opposed grooves 115 on the fixed die 84, and FIG. 2 (b) shows opposed grooves 11 on the outer periphery of the fixed die 84 and the outer die 83.
5 are provided in a pair, and in each case, a torque detection die 8 is provided.
Provided on the outer periphery of 2 above which does not affect the shear rate of the sample. Since this groove has a structure in which the groove bottom surface is wider than the groove entrance (in this example, L-shaped), when the upper dies 81 and 17 rise, they work in a direction to leave the sample 116 on the side of the outer die 83. .

When the upper die is moved upward, the cylinder 30 is moved to the side where the upper die separates from the sample chamber while the cylinder 27 is operated in the direction protruding from the sample chamber, thereby fixing the upper part as shown in FIG. The die 17 rises before the upper rotating die 81, the sample 116 projects from the sample chamber of the upper die, and after the completion, the upper fixed die 17 and the upper rotating die 81 rise integrally.
As a result, the contact area with the sample, which causes the sample to adhere to the upper die, is reduced, and the fold-shaped sample leaking to the rotary sliding portion 117 and integrated with the sample 116 in the sample chamber is rotated upward. When the die 81 is moved out of the sliding portion 117 before leaving the sample, it works in a direction in which the sample is further left on the outer cylindrical die 83 side.

When the sample left on the outer cylinder die side is in an unvulcanized state or a semi-vulcanized state, inserting a needle into the sample with a needle-shaped knurling tool seen with a conventional measuring device and discharging it will result in a viscous component. These samples, which are large and have high tackiness, have little effect because the sample with the needle attached thereto is cut off when the sample is peeled off.

In the present invention, in order to solve this,
As shown in FIGS. 8 and 9, 118 is a plate having a larger area than the torque detecting die, and it is inserted into the interface between the sample and the die. It is configured to fit. By doing so, the opposed groove sample 120 can be easily peeled off from the die, and the sample is finally put on the plate of the discharge gripper and discharged from the die as shown in FIG. .

The notch 119 of the discharge gripper is an escape for the opposed groove sample 120, and the opposed groove sample 120 is not peeled off until it is inserted from the tip of the gripper to a depth corresponding to the diameter of the sample chamber. Thereby, the insertion into the sample is reliably performed.
The sample of the discharge gripper 118 is the waste box 1 as shown in Fig. 6 and Fig. 10.
Open the discharge gripper 118 on the left and right to drop the sample, but drop the sample, but since the adhesive sample does not fall while sticking to the discharge gripper 118, sweep the sampler 124 to sweep the sample receiving surface 125 of the discharge gripper 118. By operating the scraper or the gripper, the disposal can be surely performed.

FIG. 10 shows a state in which the gripper 118 is operated in the horizontal direction. However, when the gripper is operated so as to have an inclination, the effect is further enhanced.

Start switch ON → grasp NO1 sample → supply to lower die → upper die drop → motor rotation (test start) → motor stop (test end) → Data calculation output → Projection cylinder ON → Upper die opening cylinder ON →
It is possible to fully automate the stress measurement by repeating the steps: sample remaining on the lower die → sample discharge → sample disposal → grasping the NO2 sample.

FIG. 11 shows a modified example of the present invention,
This is an example in which the bottom surface of the upper rotating die 11 is formed in a conical shape, and the upper surface of the lower die 35 is formed in a plane. Also in this example, a facing groove is similarly provided in the lower outer die side.

FIG. 12 shows another modification of the present invention. Without extending the lower end of the lower outer die 33 to the third substrate 42,
A flange 33c is provided around the center of the outer cylinder die 31, and the third substrate and the flange 33c are connected by a shaft 63. The third substrate 42 is connected to the upper end of the lower die holder 35b via a bearing 62. By adjusting the diameter of the shaft 63 and the number of shafts to be used, the strength of the outer cylinder die 33 with respect to the rotational displacement is adjusted to match that of the lower die 35.

The third invention of the present application can also be applied to a lower die in which the lower outer cylindrical die is not rotationally displaced.

(Effects of the Invention) As is clear from the above, according to the present invention, in the viscoelastic body stress measuring device, the opposed groove is provided at a position communicating with the sample chamber of the outer cylinder die and / or the fixed die. After the test is completed, the sample is configured to remain on the outer cylinder die side.
A sample desorption device is further provided to automatically supply, discharge, and discard the sample, so that the stress of the viscoelastic body can be measured automatically and continuously regardless of the state of the viscoelastic body. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a basic configuration of an embodiment of the present invention, FIG. 2 is a diagram for explaining the opposed groove shown in FIG. 1, and FIG. 3 is a diagram showing a basic configuration of the present invention. FIG. 4 is a cross-sectional view showing one embodiment of the stress measuring device of the present invention except for a sample desorbing device, and FIG. Figures, FIGS. 6 to 10 are diagrams for explaining an example of a sample desorption device in the stress measurement device of the present invention, and FIGS. 11 to 12 are diagrams each showing another modification of the present invention. FIG. 13 is a cross-sectional view showing the basic configuration of a conventional measuring device. 1 ... motor 2,28,29,42,45 ... substrate 5,7 ... spur gear, 6 ... shaft 8 ... upper die holder, 9 ... upper heater block 10,13 ... screw, 11 ... Upper rotating die 12 Bearing bearings 14, 15, 16, 25, 33b Bearing 17 Upper fixed die 18, Sample chamber 19, 32, 34 O-ring 20, 43 Insulation member 21, 36, 37 ... heaters 22, 40, 41 ... temperature detector 23 ... heat medium inlet 24, 38, 39 ... lead wire 26 ... arm, 27, 30 ... cylinder 29 ... connecting plate, 31 …… Lower fixed die 33 …… Lower outer cylinder die, 35 …… Lower die 46,47,49 …… Arm 48 …… Small displacement meter, 50 …… Torque detector 51 …… Recorder 52a, 52b …… Slip Rings 53a, 53b ... insulator, 54 ... cover 55 ... bearing, 56 ... carbon brush 57a, b ... lead wire, 59 ... heating medium 60 ... receiving part, 61 ... temperature detector 33c ... ... Flange, 62 ... Bearing 63 …… shaft, 115 …… opposite groove 127 …… robot

Continuation of front page (56) References JP-A-60-120253 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01N 19/00 G01N 3/00-3/62

Claims (4)

(57) [Claims] 1. An upper die and a lower die which are coaxially opposed to each other and define a part of a sample chamber accommodating a viscoelastic body whose stress is to be measured, and one of the upper die and the lower die. And a mechanism for giving a rotational movement to one of the dies, a stress measuring device for detecting the anti-torque applied to the other die,
An outer cylinder die is provided on the outer periphery of the die on which the torque is detected, and the surface of the outer cylinder die that defines a part of the sample chamber is subjected to slip prevention processing with the sample, and the diameter of the rotating die is adjusted. Be larger than the diameter of the outer cylindrical die, provided with a fixed die on the outer periphery of the rotating die, a part of the inner surface of the fixed die is configured to define a side surface of the sample chamber, A plurality of opposed grooves are provided on the outer periphery of the outer cylindrical die at positions communicating with the sample chamber, and a sample desorption device that automatically supplies, discharges, and discards the sample to and from the sample chamber is provided. A stress measuring device for a viscoelastic body, characterized in that: 2. The method according to claim 1, wherein the outer cylinder die and the die on the torque detecting side are rotationally displaced at the same angle in the same direction by a shear stress received from the sample.
The stress measurement device according to item 1. 3. The stress measurement according to claim 1, wherein the sample is taken out of the sample chamber while the rotary die or the torque detecting die and the outer die are moved in the axial direction. apparatus. 4. The stress measuring device according to claim 1, wherein the sample discharging grip constituting the attaching / detaching device has a plate shape having an area larger than the torque detecting die.