JPH04252938A - Abrasion tester - Google Patents

Abstract

PURPOSE:To evaluate the abrasion of the member coming into contact with paper under a condition near to an actual machine in a paper related product such as a printing machine or a paper processing machine. CONSTITUTION:An abrasion tester is equipped with a taking-up reel having drive mechanisms 8a, 8b, a delivery roll 2 having a torque limiter 5, the ribbon running path constituted of several guide rollers 6a-6h between the taking-up reel 7 and the delivery roll 2, the abrasion sample 9 arranged on the horizontal part of the ribbon running path, a load mechanism 17 applying load to the abrasion sample 9, a friction measuring mechanism 14 measuring the coefficient of dynamic friction of the abrasion sample to a ribbon 4 and the ribbon tension measuring mechanism 10 provided to the ribbon running path.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a testing device for evaluating the wear of members that come into contact with paper in paper-related products (eg, printing machines, paper processing machines, etc.).

0002

[Prior Art] There are two types of printing paper used in printing machines and the like: sheets that are cut one by one to a predetermined length, and webs (continuous paper) that are fed out from a roll of paper. When these papers pass through the printing press, they wear out the parts they come into contact with, causing various problems. This is said to be caused by clay, talc, sand, etc. contained in the paper. Recently, from the viewpoint of increasing the precision and ensuring reliability of machines (components), there has been an increasing need to quantitatively evaluate the wear of parts using paper, which was not seen as a problem in the past. However, in the current situation,
Abrasion testing equipment for paper is not generally available on the market.

The conventional method of obtaining relatively accurate wear data is as shown in FIG.
1, 02, 03), or by manufacturing a device that reproduces a portion of the actual machine and conducting experiments. In the figure, 04 is paper and 06 is a sample holder. In addition, in foreign research institutions, for example,
It appears that the format shown in is being created and being considered. The device shown in FIG. 5 has a small diameter rotating drum 07.
In this method, paper 08 is pasted on the surface of the drum, and abrasion sample 05 is pressed onto the surface of this drum.

0004

[Problem to be Solved by the Invention] The above-mentioned prior art includes:
There are the following problems. In the case of sliding wear, the amount of wear is generally proportional to the sliding distance and pressing force (load), so one way to improve the measurement accuracy of the amount of wear is to measure the sliding distance under stable conditions. It is necessary to collect long data (data with a large amount of wear).

In the case of the apparatus shown in FIG. 5, the abrasion sample 05 is moved in the axial direction of the drum 07 so that the new paper surface 08 and the abrasion sample 05 are always in contact with each other, but the overall sliding distance is long. Can not be removes. Many repeated tests are required to obtain the sliding distance. In actual machines, the web travels at a speed of several hundred meters per minute, and some machines operate almost continuously day and night, so a device like the one shown in Figure 5 is inefficient in reproducing the wear phenomena under these conditions. Furthermore, as wear conditions, it is not possible to provide and understand the tension and friction state (friction coefficient) of the webbing in an actual machine.

[0006] In the case of the device shown in Fig. 4, it is necessary to use actual paper, so the test device was designed to match the size of the paper roll for actual use (eg, outer diameter φ1000 x surface length 800 mm). This results in a large test device, which results in an inefficient abrasion test device in terms of economy and device operability. An object of the present invention is to provide a wear evaluation device that can measure the coefficient of friction and control ribbon tension using a ribbon (a narrow paper roll) taken from an actual paper roll. be.

[0007]

[Means for Solving the Problem] First, actual paper (roll) is used as the abrasion test condition. Since the actual paper roll usually has an outer diameter or surface length of 1 m or more, this is processed into a ribbon with a narrow paper width (the outer diameter is set to a maximum of about 800 mm in order to increase the sliding distance). Next, as a basic structure, the method of running the ribbon from the feeding roll to the take-up reel side is to connect a torque limiter to the feeding roll side in order to give a constant tension to the ribbon, and to adjust the speed on one of the take-up reel sides. Attach a drive motor that can be used for winding. The abrasion sample is attached to the tip of the loading device where the ribbon runs horizontally, and has a structure in which it comes into contact with the surface of the ribbon. In order to easily attach and detach the ribbon during testing, the paper roll shaft, guide rollers, etc. are all cantilevered.

[0008]

[Operation] The ribbon is adjusted to an arbitrary running speed by the drive motor of the take-up reel, and the ribbon tension is adjusted by the torque limiter. By changing the load of the loading device (sample holder), the pressing force between the abrasion sample and the paper is adjusted.

[0009]

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In the figure, 1 is a panel, 2 is a feeding roll, 3
is the axis of roll 2, 4 is a ribbon (web with a paper width of 60 m/m), 5 is a torque limiter, 6a, 6b, 6c, 6d, 6
e, 6f, 6g, 6h are guide rolls for the ribbon 4, 7 is a take-up reel, 8a is a drive roll for the take-up reel 7, 8
b is the drive roll motor, 9 is the wear sample, 9a, 9b
is a sample holder, 10 is a load cell of the guide roll 6c (tension roll), 11 is a tension indicator,
12 is a sample fixing table, 13 is a leaf spring for suspending the sample fixing table 12, 14 is a load cell of the sample fixing table 12, 15 is a dynamic friction coefficient display meter 16 is a drive roll control box, 17 is a weight for loading the wear sample 9, 1
Reference numeral 8 denotes a pedestal provided under the ribbon 4 in correspondence with the wear sample 9. A torque limiter 5 is attached to the shaft 3 on which the feed roll 2 (a paper roll with an outer diameter of 800 mm and a width of 60 mm) is mounted to control the tension of the ribbon 4. The ribbon 4 passes through each guide roller (6a to 6h) and moves to the take-up reel 7. Winding is performed by a drive roll 8a and a drive roll motor 8b. The winding speed can be adjusted from 0 to any speed using the control box 16. An area where the ribbon 4 runs horizontally is provided between the guide rolls 6e and 6f, and the abrasion test is performed by bringing the ribbon 4 into contact with the abrasion sample 9 in this area. (See Figure 3). The tension of the ribbon 4 is detected by attaching a load cell 10 to a guide roll 6c (tension roll), and a tension indicator 11
to be displayed. The coefficient of friction between the ribbon 4 and the abrasion sample 9 is detected by attaching a load cell 14 to a load device section consisting of a sample fixing table 12 and a plate spring 13, and is displayed on a dynamic friction coefficient indicator 15.

The load of the wear sample 9 on the ribbon 4 running on the pedestal 18 is adjusted using a weight 17. Note that the shape, loading method, etc. of the wear sample 9 are intended to indicate basic wear test conditions, and can be rearranged to suit various test purposes.

[0011]

Effects of the Invention The abrasion testing device according to the present invention has a ribbon running system comprising a take-up reel having a drive mechanism, a feed-out roll having a torque limiter, and a plurality of guide rolls between the take-up reel and the feed-out roll. a wear sample disposed above a horizontal portion of the ribbon running path, a loading mechanism that applies a load to the wear sample, a friction measuring mechanism that measures a coefficient of dynamic friction of the wear sample with respect to the ribbon, and the ribbon running path. By providing the ribbon tension measuring mechanism provided in the ribbon tension measurement mechanism, the following effects are achieved. Under operating conditions close to the actual machine, wear and friction caused by the paper in the wear sample (
Problems related to coefficients) can be tested and evaluated inexpensively and efficiently, and can be reflected in the design of actual equipment. Because a narrow paper ribbon is used for the abrasion test,
It becomes possible to make the test equipment smaller and cheaper.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the wear test device of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is an enlarged view of the wear sample portion shown in FIG. 1;

FIG. 4 is a schematic diagram of a conventional wear test device using an actual machine.

FIG. 5 is a schematic diagram of a conventional drum-based abrasion test device.

[Explanation of symbols]

2. Feeding roll 4 Ribbon 5 Torque limiter 7 Take-up reel 9 Wear sample 12 Sample fixing stand 10 Load cell 14 Load cell 17 Weight

Claims (1)

[Claims] 1. A take-up reel having a drive mechanism, a feed-out roll having a torque limiter, a ribbon running path including a plurality of guide rolls between the take-up reel and the feed-out roll, and a ribbon running path including a plurality of guide rolls between the take-up reel and the feed-out roll; a wear sample disposed above a horizontal portion; a loading mechanism that applies a load to the wear sample; a friction measurement mechanism that measures a coefficient of dynamic friction of the wear sample with respect to the ribbon; and a ribbon tension measurement mechanism provided on the ribbon running path. A wear testing device characterized by comprising: