JPH0526524Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a loading device used to pressurize a sample in a capillary viscometer for measuring the viscosity of a thermoplastic resin or the like.

(Prior art) There is a capillary viscometer configured to pressurize a sample in a heat chamber with a piston, extrude it through a nozzle hole of a die provided in the heat chamber, and determine the viscosity of the sample from the extrusion speed. . Sample extrusion methods for this type of viscometer include a constant speed extrusion method in which the extrusion speed is kept constant and a constant load extrusion method in which the load is kept constant. In the constant load extrusion method, a test is performed by applying a predetermined load to the piston, and a weight replacement method, which is simple in principle, is often used as a means for applying this load.

(Problem that the invention aims to solve) In the above constant load extrusion method, the weights are changed manually by the operator, but the test load is changed frequently, such as when measuring the pressure effect or correcting the pipe length of the die. If it is necessary to do so, there are problems in that a great deal of labor is required and the workability is poor.

In addition, when calculating viscosity by automatically calculating test results using a CPU, if the load conditions that are the basis of the calculation are input only as numerical values, it is difficult to reliably maintain consistency with the actual load. The points were also hot.

(Means for Solving the Problems) In order to solve the above problems, the present invention employs the following configuration.

That is, the loading device according to the present invention includes a press rod that is supported in a vertically movable manner by a crosshead that can itself be raised and lowered, and whose lower end abuts the piston when pressurized, and a group of weights that includes a plurality of weights. From this group of weights, select one according to the target load.
or a weight selection device that selects two or more weights as appropriate and applies the selected weights to the press rod; the weight selection device includes a receiving plate having a hole through which the weight freely passes vertically; The plate can be selectively moved between a loaded position in which the weight is moved downwardly through the hole and an unloaded position in which the weight does not pass through the hole but is supported by resting on it. It is characterized by comprising a drive device.

(Operation) The weight selection device selects one or more weights necessary to obtain a target load from a group of weights, and causes the weight of the selected weights to act on the press rod. This selection of weights positions the receiving plate in the loaded position so that only the desired weight passes through the hole, and positions the other receiving plate in the unloaded position where the weight does not pass through the hole and is supported. This is done by letting The press rod is supported so as to be able to move up and down, and moves together with the piston over the entire pressing stroke of the piston, with its lower end abutting the piston for pressurizing the sample and applying the above-mentioned load to the piston.

(Example) The figure shows an example of the present invention, and this viscometer 1 includes a heat chamber 2 having a sample chamber provided with a die on the outlet side, and a heat chamber 2 that heats a sample housed in the sample chamber. The heat chamber 2 is provided with a piston 3 that presses the heat chamber 2, and is supported by a support frame 7 that is pivotally supported by a machine frame 5. Heat chamber 2 is
As shown by the chain line in FIG. 3, the sample chamber can be cleaned, etc. by rotating around a shaft 6.

Next, to explain the loading device 9, the machine frame 5 has a nut screwed onto a screw rod 11 that is rotated by a load motor 10, and a crosshead that is raised and lowered by the rotation of the screw rod. 12 are provided. A press rod 15 is supported on the crosshead 12 via a slide bearing 14 so as to be vertically movable. A flange portion 16 is provided at the upper end of the press rod 15, and a screw type adjuster 17 whose length can be adjusted is provided at the lower end.

A culm 19 is attached to the flange portion 16 of the press rod 15.
is placed. The culm 19 is connected to a balance weight 24 by a wire 22 stretched between pulleys 20 and 21, and a force in the lifting direction is applied by the weight. A potentiometer 23 as a piston movement detection device is attached to the pulley 20, and is configured to output a signal representing the flow velocity of the sample. Hanging rods 26, 26 are connected to both ends of the culm 19, and hanging fittings 27 for supporting a weight are fixed to the hanging rods at appropriate positions. Further, weights 30 (A, B, C, . . . ) having different weights are attached to each of the hanging fittings 27. In addition, the hanging rods 2 on both sides of the culm 19
Weights 6 and 26 are symmetrically attached with equal weights, so that the left and right weight balance of the press rod 15 is always maintained.

The weight 30 is formed into an uneven shape in plan view, and has a through hole 31 in its core through which the hanging rod 26 is inserted, and the lower end of the through hole has an enlarged diameter into which the hanging fitting 27 is fitted. A section is formed.

Next, the weight selection device 32 will be explained.
At the bottom of each of the weights 30, there is a hole 33 having a shape similar to the uneven outer shape of the weight and slightly larger than the outer shape of the weight.
Receiving plates 33 each having a diameter a are arranged.
Each receiving plate 33 is slidably mounted on a rail 34 provided on the machine frame 5, and is connected to a corresponding connecting rod 35 by a handle 33b. Rollers 37 that roll on the rail 34 are attached to both ends of the connecting rod 35, and a nut 3 is attached to the center.
9 is fixed. The nut 39 has a threaded rod 41 which is rotated in forward and reverse directions by a weight sorting motor 40.
are screwed together. When the motor 40 is started to rotate the screw rod 41, the connecting rod 35 moves back and forth together with the left and right receiving plates 33, 33. In the load position where the weight 30 fits well into the hole 33a of the receiving plate 33, the weight 30 can move downward through the hole 33a, so that the weight of the weight is transferred to the hanging rod 26 and the culm 19. The press rod 15 is loaded via the press rod 15. On the other hand, if the receiving plate 33 moves in the front-back direction due to the rotation of the motor 40 and the outer shape of the weight 30 is misaligned with the hole 33a, the weight 3
0 cannot pass through the hole 33a, and the receiving plate 33
Since it is supported by the press rod 15, its weight is not applied to the press rod 15. The motors 40, 40, . . . serving as drive devices are turned on and off by a control device (not shown).

When conducting a test using this viscometer 1, first put a predetermined amount of sample into the heat chamber 2,
After heating to a predetermined temperature, a load is applied to the piston 3 inserted onto the sample to push the sample out of the nozzle hole of the die.

The load on the piston 3 is carried out by the loading device 9. To do this, data on the necessary load is input into the control device so that the desired load is applied to the press rod 15.
A necessary weight is selected from the group of weights so as to be added to the weight group, and the other weights are supported by the receiving plate 33 by starting the motor 40. In the weight group,
Since weights with various weights are included, any load can be obtained by appropriately combining them. Since any load can be automatically set by simply turning the motors 40, . . . on and off, changing the load is extremely easy. Since this is a direct loading method in which the load is applied directly to the press rod, the stroke of the press rod 15 can be made longer than other loading methods such as the lever loading method.

Note that other drive sources such as an air cylinder, a solenoid, etc. may be used instead of the load motor 10 and the weight selection motor 40. Further, in the illustrated example, a balance weight 24 is provided, and this balance weight acts as a negative load, but as shown in FIG. It is convenient to provide a load removing device 50 for removing load, since it is possible to further increase the steps of the load that can be applied. This removing device 50 includes a support stand 51 that supports the balance weight 24, a threaded rod 53 into which a nut 52 provided at the base of the support stand is screwed, and a motor 55 that rotates the screw rod in forward and reverse directions. The screw rod 53 is rotatably supported by a mounting frame 57 fixed to the machine frame. When the motor 55 is activated to rotate the screw rod 53, the support base 51 moves up and down to support or release the balance weight 24.

(Effect of the invention) As explained above, the loading device according to the invention is equipped with a weight selection device that selects a necessary weight from among a plurality of weights and applies it to the press rod, so that It has become extremely easy to change the applied load, and by adopting an automatic load exchange method, it has become possible to eliminate measurement errors caused by load consistency during data calculation by the CPU.

[Brief explanation of drawings]

FIGS. 1, 2, and 3 are a plan view, a front view, and a side view showing an embodiment of the present invention, and FIG. 4 is an explanatory diagram of a main part showing a different embodiment. 1...Viscometer, 2...Heat chamber, 3...
...Piston, 5...Machine frame, 9...Loading device, 10
...Load motor, 11...Screw rod, 12...
Crosshead, 15...Press rod, 17...
Adjustment jack, 19... Culm, 26... Hanging rod, 30... Weight, 32... Weight selection device.

Claims (1)

[Scope of utility model registration request] A loading device for pressurizing a sample of a viscometer configured to pressurize a sample in a heat chamber with a piston and extrude it from a nozzle hole of a die provided in the heat chamber, and determine the viscosity of the sample from the extrusion speed. , a press rod that is supported in a vertically movable manner by a crosshead that can itself be raised and lowered, and whose lower end abuts the piston when pressurized; a group of weights consisting of a number of weights; a weight selection device that appropriately selects one or more weights according to the load to be applied and applies the selected weight to the press rod; the weight selection device has a hole through which the weight freely passes vertically; a receiving plate having a support plate, and selecting the receiving plate into a loaded position where the weight can move downward through the hole, and a non-loaded position where the weight does not pass through the hole but is placed on it and supported. A loading device for a viscometer, characterized in that it is equipped with a drive device that can move the viscometer.