JPH1054788A - Bursting strength testing machine for paper and the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bursting strength testing machine for paper and the like for satisfying the standard as a device specified in the Japanese Industrial Standards and also capable of measuring an optional position of a test piece of at least width 250mm × length 400mm without removing it from a clamping plate. SOLUTION: A lower clamping plate 5 which has a pressure chamber 4 on its lower side is fixed in nearly the center part of a plate shaped base 1 and also pillars 2, 2 are raised at both sides of an assembling position of the lower clamping plate 5 with a space so that center of the pillars 2, 2 are positioned on a center line of the lower clamping plate 5, a beam 3 is suspended and fixed between the pillars 2, 2, and an upper clamping plate 6 is vertically disposed for moving in the vertical direction at a position a vertical lines passing through the center of the lower clamping plate 5 of the beam 3 intersect each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rupture strength tester for measuring the rupture strength of paper, paperboard, cardboard and the like.

[0002]

2. Description of the Related Art As a method for measuring the bursting strength of paper and paperboard, a Mullen-type bursting strength tester has been widely used in the past. The test method is defined as JISP8112, P8131. That is, it is specified to use a Mullen-type testing machine as the device, the clamp plate of the test piece of the device, a rubber diaphragm, a pressurizing device for the rubber diaphragm, and a maximum measuring pressure applied until the test piece breaks. The pressure indicator and the like are specified in detail.

[0003] Recently, in order to satisfy the specifications of these devices and to facilitate the operation, automation of switching between pressurization and depressurization of a pressurizing device, up and down movement of an upper clamping plate for clamping a test piece, and clamping pressure. In addition, improvements have been made, such as stabilization of measured values, and furthermore, measured values are electrically measured and numerically displayed or printed.

[0004]

As described above, the bursting strength tester for paper and the like has been standardized to the Japanese Industrial Standards, has been mechanically improved, and is widely used in paper pulp and related industries. However, the two arms for mounting an annular clamping plate that is parallel to the left and right in the direction of one column, which is known as the Mullen-type burst strength tester, are cast iron. It is molded integrally with the support column, etc., and a rubber diaphragm is attached to the lower surface of the lower clamping plate, and the rubber diaphragm is expanded by applying pressure by liquid and presses the test piece, measuring the maximum pressure when it breaks The size of the test piece is specified to be 100 mm × 100 mm or more, but a size of 250 mm × 400 mm for measuring rice basis weight has been generally used.

However, the position at which the specimen is ruptured is 10
There is no problem in the case of the size of about 0 mm x 100 mm, but the width 25
In the case of a test piece having a size of 0 mm x 400 mm in length, two places are measured in the width direction and three to four places are measured in the longitudinal direction, but since the distance from the center of the clamp plate of the test piece to the support is about 100 mm,
In particular, plate-shaped test pieces such as paperboard and corrugated cardboard sheets need to be measured in the longitudinal direction, then the test piece must be rotated 180 degrees and measured again in the longitudinal direction. If the position is more than 100mm from the end, it is necessary to measure the position away from the ruled line to bend the box. It was something.

For this reason, it has become desirable to increase the distance from the center of the tightening plate for tightening the test piece of the tester to the support by about 150 mm to 200 mm. It is necessary to have a structure in which the mounting arm does not bend.As a result, there are problems in that the support and the arm are large and the testing machine itself is heavy and large, and the distance between the clamping plate and the support is improved. Have been tested without.

[0007] The present invention satisfies the requirements as an apparatus defined in Japanese Industrial Standards and has a width of at least 250 mm.
It is an object of the present invention to provide a testing machine capable of measuring an arbitrary place without removing a test piece having a length of 400 mm from a clamping plate.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been made as a result of study to solve such problems, and a lower fastening plate provided with a pressurizing chamber on the lower side is provided on a plate-like base.と 共 に In addition to fixing to the center part, erected so that the center of the column is located on the center line of the lower clamping plate at intervals on both sides of the mounting position of the lower clamping plate, and suspend and fix the beam between the columns. This problem can be solved by vertically arranging the upper clamp plate vertically at a position where a vertical line passing through the center of the lower clamp plate of the beam intersects.

When the width of the test piece is 250 mm,
It is sufficient to measure the position 62.5mm from both sides, so if the distance from the center of the clamping plate to the support is 187.5mm or more, the test specimen can be moved to the left or right so that it can be measured. Is desirable.

A pressure chamber for pressurizing a rubber diaphragm attached to the lower surface of the lower clamping plate is provided, and the pressure is controlled by a piston driven by an electric motor so that liquid glycerin is reduced to 1 / min.
The piston is added by feeding it into the pressure chamber at a flow rate of 70 ± 15 ml, but it is necessary to return the piston to the original position immediately before pressurization after the rupture of the test piece. I did this by switching, but this caused the gearbox to become large, which could be one reason why I couldn't move the test piece without the support, but by switching the direction of rotation of the motor itself, A large gear box is not required, and the upper surface of the drive unit of the piston can be configured to be located below the surface of the lower clamping plate, enabling horizontal movement of the test specimen and minimizing the distance between the columns. Was made.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to embodiments shown in the drawings. As shown in FIG. 1, a pressure chamber (4) in which a lower fastening plate (5) is mounted on the top is fixed with bolts or the like at a substantially central portion of the surface of a plate-like base (1). Pillars (2) and (2) are erected at positions away from the pressure chamber (4) on both sides of 4),
A beam (3) is suspended between the columns (2) and (2), and an upper clamping plate (6) is suspended from the beam (3).

The centers of the columns (2) and (2) are located at the lower fastening plate (5).
The upper clamping plate (6) is positioned on a vertical line passing through the center of the lower clamping plate (5), and is vertically movable vertically.

Further, the struts (2), (2) and the beam (3) have a shape like a shape steel such as a channel and a prism, and are provided between the struts (2), (2) and the beam (3) and between the struts (2). It is recommended that reinforcing ribs (8), (8) ... be provided between the mounting parts to the base (1) and the base (1), avoiding the extension of the surface of the lower clamping plate (5). As long as the beam (3) has a structure that does not bend, the beam or the mold may be molded and assembled with aluminum or cast iron for casting.

Further, in the present invention, a driving portion of a piston (9) for feeding and discharging liquid glycerin into and from the pressure chamber (4).
(10) The motor (omitted in the drawing) is reduced in size by switching the power switch forward and reverse, and moving the piston to move the piston. The upper surface of the drive unit (10) cover has a lower clamping plate.
It is configured to be located below the upper surface of (5).

[0015]

Since the present invention is constructed as described above, the test piece has a plate shape and is 250 mm wide × 400 mm long.
Even if it is large, it can be moved right and left for measurement, so measurement can be done easily in a short time, especially when it is necessary to measure the central part avoiding ruled lines for box making such as corrugated cardboard sheets. Can be measured without cutting.

Further, a cylinder is mounted on the upper surface of the beam to move the upper clamping plate up and down and clamp the test piece to the lower clamping plate. On the upper surface, a digital pressure indicator for displaying and recording measured values and a recorder can be placed.
In addition, the glycerin replenishment tank and the cylinder air regulating valve can be attached to the support, so that the operation is easier and the size can be reduced as compared with the conventional testing machine. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of the present invention.

[Explanation of symbols]

 Reference Signs List 1 base 2 support 3 beam 4 pressure chamber 5 lower fastening plate 6 upper fastening plate 7 cylinder 8 auxiliary rib 9 piston 10 drive unit (of piston)

Claims (1)

[Claims] A pressurizing chamber (4) is provided at approximately the center of a plate-like base (1).
Fix the lower fastening plate (5) with
The pillars (2) and (2) are erected so that the centers of the pillars (2) and (2) are located at both sides of the mounting position of the beam, and a beam (3) is suspended between the pillars (2) and (2). A burst strength tester characterized in that the upper clamping plate (6) is vertically installed at the intersection with a vertical line passing through the center of the lower clamping plate (5) in 3) so as to be vertically movable.