JPS61265295A - Rotary edge for cutting and method of cutting hollow yarn separating membrane module by using said rotary edge - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention forms a hollow fiber separation membrane module that separates a specific component from a raw material fluid by utilizing the difference in permeability of each component in the raw material fluid. The present invention relates to a cutting method and a rotary cutting blade suitable for use therein.

[Prior Art] Conventionally, there have been devices that use hollow fiber separation membranes and utilize the principles of osmosis or ultrafiltration to separate specific components from a fluid mixture (raw material fluid), concentrate the material fluid, etc. Various proposals have been made.

FIG. 2 is a perspective view showing a schematic configuration of a hollow fiber separation membrane module used in such a fluid separation device.

The hollow weight 19 membrane 31 usually has a diameter of 200 to 500 mm.
They are tube-shaped objects made of polyimide resin, etc., which are as thin as pm, and a very large number of them are bundled together to form the bundle body 32.

Each of the hollow fiber separations 1I131 has an upper synthetic resin plate 3
3, and its upper end 31a is exposed at the end surface of the upper synthetic resin plate 33. This allows the inside of the hollow fiber separation membrane 31 to communicate with the separation fluid extraction chamber provided above the upper synthetic resin plate 33.

The lower end side of the hollow fiber separation [931] is embedded and sealed in the lower synthetic resin plate 34.

In such a hollow fiber separation membrane module, when the raw material fluid A (for example, a mixed gas of hydrogen and methane) is pressurized and brought into contact with the bundle 32, a specific component contained in the raw material fluid A (for example, hydrogen ) penetrates into the interior of the hollow fiber separation llll31, then moves upward therein, and is taken out from its upper end 31a.

Next, a method for forming the hollow fiber separation membrane module will be explained.

First, the hollow fiber separation membranes 31 are aligned to form a bundle 32. Next, both ends of the bundle 32 are surrounded by a mold in a box shape, and a synthetic resin such as epoxy is poured into the mold.
Both ends of the bundle 32 are embedded in synthetic resin.

Thereafter, the synthetic resin that will become the upper synthetic resin plate 33 is cut in the direction of the plate surface so as to also cut off the tips (upper ends) of the hollow fiber separation membranes 31 embedded therein. As a result, the cut end of the hollow fiber separation membrane 115I31 is exposed on the end surface of the upper synthetic resin plate 33, and the inside of the hollow fiber separation membrane 31 is communicated with the upper side of the upper synthetic resin plate 33.

[Problems to be Solved by the Invention] As described above, in the process of manufacturing a hollow fiber separation membrane module, there is a step of cutting the resin that solidifies the end of the bundle of hollow fiber separation membranes.

Conventionally, for this cutting, for example, a slender, straight metal blade with a cutting edge such as a planer blade is held perpendicular to the direction in which the blade moves, or in an inclined position, and the blade is placed directly above the resin. A method is used in which the resin is cut using a guillotine by lowering the blade, but this method creates a large amount of frictional resistance between the resin and the resin. The end portion of the hollow fiber separation membrane 31 that has been exposed after being cut may be deformed by being rubbed by the side surface of the blade, or the end portion may be deformed by the frictional heat, and the upper end may be deformed by the heat. The opening area of 31a was often reduced or blocked.

[Means for Solving the Problems] The rotary cutting blade of the present invention has a concave surface on the side that contacts the material to be cut, thereby reducing the area between the single-turn blade and the material to be cut.

Furthermore, the method for cutting the hollow fiber separation membrane module of the present invention includes:
In this way, the resin that solidifies the end of the bundle of hollow separation membranes is cut using a rotating plate whose surface in contact with the material to be cut is concave to reduce the area of friction with the resin. It is something.

In a preferred embodiment of this cutting method, the diameter of the rotary blade is larger than twice the diameter of the resin to be cut, and the rotary blade is positioned relative to the resin such that the center of the rotary blade deviates from the center of the resin. Move and cut.

[Function] Since the rotary blade of the present invention has a concave surface in contact with the material to be cut, the area of friction with the material to be cut is small, and therefore the generation of frictional heat is extremely small.

If this rotary blade is used to cut the resin that hardens the end of the hollow fiber separation membrane bundle, frictional heat is extremely low, so thermal deformation of the resin and the hollow fiber separation membrane is prevented, and the rotary blade Since the side surfaces do not rub against the end surfaces of the hollow fiber separation membrane, deformation and blockage of the open pore ends are prevented.

Furthermore, in this cutting method, if the diameter of the rotary blade is made larger than twice the diameter of the resin and the rotary blade is moved relative to the resin so that the center of the rotary blade deviates from the center of the resin, the cutting is performed even better, and deformation and blockage of the pores of the hollow fiber separation membrane are more reliably prevented.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a sectional view of a rotary blade according to an embodiment, FIG. 3 is a view taken along line mm in FIG. 1, and FIG. 4 is an enlarged view of the main part of FIG. 1. Note that FIG. 1 shows a sectional view taken along line II in FIG. 3.

The rotary blade 1 according to this embodiment includes a rotary blade main body 2 and a cutter 3 attached to the rotary blade main body 2. .

The rotary blade body 2 has an annular shape with the center of a disc hollowed out, and a stepped portion 4 into which the blade 3 is fitted and attached is formed on its periphery. Also, a hole 6 through which a port 5 for attaching the blade 3 to the rotary blade body 2 is inserted.
However, a plurality of the step portions 4 are provided so as to pass through the portion where the stepped portion 4 is provided. In this embodiment, a total of eight holes 6 are provided, and they are bored at equal radial positions and at equal intervals.

In addition, a one-turn blade body 2 is provided in the center side of the hole 6.
A port insertion hole 7 is provided for attaching the rotary jig to a rotating jig. A total of 12 holes 7 are provided at equal radial positions and equally spaced apart.

Reference numeral 8 in the figure indicates a central hole hollowed out in the center of the rotary blade body.

The knife 3 is a thin ring-shaped one, and the shape of the cutting edge is as follows:
As shown in FIG. 4, there are 1 black color, 11 black color, 2 black color 12.3 black color 13. 1 Ink color 11 indicates the cut material (
A larger angle is taken compared to the 2nd black color 12 and the 3rd black color 13 so that chips (chips) can always escape from the cutting surface. This first angle is, for example, an angle of about 40 to 50". If this first angle is smaller than 40 degrees, the cutting quality will be better, but
50' The strength (rigidity) of the blade 1 decreases and the cutting edge becomes bent or chipped, causing chipping.
If it is larger, the chips will curl and get caught in the contact area between the blade and the cutting surface of the resin 33, damaging the blade edge and the resin 33, and will also make the cutting dull and block the holes in the hollow fibers. Put it away.

The angle of the two ink color 12 is selected so that it has an appropriate thickness so that the cutter 3 has sufficient rigidity. This angle is, for example, about 13 to 20 degrees.

For the three ink colors 13, an angle is selected to ensure the rigidity of the blade 3 while making it thin, for example, about 13 degrees or less.

In this example, the first angle is 45°, and the second angle is 1
5°, and the third angle is 12°.

This cutter 3 is preferably made of a sintered body of super hard alloy or the like so that it can cut hard epoxy resin.

The first corner should be selected depending on the material of the resin to be cut. If the hardness of the resin is high, it should be made thicker, and if the hardness is small, it should be made smaller. For example, 4 Scl ± 3 degrees.
Make a selection like this.

As shown in FIG. 4, the surface of the blade 3 on the side that comes into contact with the material to be cut has a concave shape inclined by a predetermined angle θ. In this way, by making the surface in contact with the material to be cut concave, it is possible to prevent the side surface of the blade from hitting the hollow fiber that has already been cut, thereby preventing the hollow fiber end face from being crushed. The contact area is extremely small, and the frictional heat is drastically reduced (about 70%). Therefore, the hollow fibers and the resin are not affected by heat as much as possible, and their deformation due to heat is prevented.

In the illustrated embodiment, this concave portion starts from a portion inside the tip of the cutter 3 by a minute pressure ml.

This distance statement is, for example, 0 to 0.5 mm. 0.5
If it is larger than mm, the amount of heat generated will increase, and cutting resistance will easily act on the hollow fiber, causing deformation of the hollow fiber end face, which is undesirable. It may also be a concave surface that is suddenly inclined by the predetermined θ. In this case, the first corner is made slightly larger to maintain the strength of the cutting edge.In the case of this embodiment, l=0.1-0.2 mm.

The angle θ may be a small angle of, for example, 10 or less. If the angle θ is larger than 1°, not only will the strength of the cutting edge not be maintained, but it will also be difficult to maintain the parallelism of the cutting surface. In the embodiment, it is 10 minutes.

In addition, in FIGS. 1 and 3, 9 indicates a screw hole provided in the cutter 3, and the port 5 is screwed into this screw hole to solidify the rotary blade body 2 and the cutter 3. .

The reason why the rotary blade l is configured by connecting the rotary blade main body 2 and the cutter 3 in this embodiment is as follows.
This is to allow only the blade 3 to be replaced when it wears out.

FIG. 5 shows a rotating jig 15 for attaching the rotating blade l to a rotating device. Note that FIG. 5 is a cross-sectional view in the axial direction, and FIG. 6 is a view taken along the line Vl--Vl in FIG.

This rotating jig 15 has a shaft portion 16 and a flange portion 17. The shaft portion 16 has a tapered surface 18 and can be attached to a rotating device using a so-called taper shank method.

The flange portion 17 is provided with a plurality of (four in the embodiment) port insertion holes 19 for attaching the rotating jig 15 to a rotating device. Further, 20 is a screw hole into which a bolt for attaching the rotary blade 1 to the rotary jig 15 is screwed.

Next, a method of cutting the resin of the hollow separation membrane module using the rotary blade configured as described above will be explained.

Figure 7 is a front view explaining the method of cutting the mole, and Figure 8 is the 7th
It is a sectional view taken along the line ■-■ in the figure.

In FIG. 7 and FIG. 8, 21 is a surface plate on the machine side, and a lower clamping member 23 is fixed with a bolt 22.
An upper clamping member 24 is attached to the port 2 above this clamping member 23.
5 makes it removable.

The holding members 23 and 24 have semicircular notches on opposing sides, so that the hollow fibers a can be held together as shown in FIG.
The resin 33 of the S module is clamped. In FIG. 8, 26 is a cover for protecting the hollow fiber separation membrane module.

As shown in FIG. 7, the rotary blade l is rotated and moved relative to the resin 33 to cut the end of the resin 33, and the hollow fiber separation 1 embedded in the resin 33 is cut.
! The end portion 31a of the resin 33 is exposed to the end portion of the resin 33.

Since the rotary blade l has a concave shape on the side in contact with the resin 33, the friction area with the resin 33 is extremely small and almost no frictional heat is generated, so the resin 33 is not thermally deformed or cracked due to thermal changes. Moreover, since it is concave like this, the surface once scraped will not be rubbed by the side surface of the rotary blade, and the end of the hollow fiber separation membrane 31 exposed at the end of the resin 33 will not be deformed. It will never be blocked or blocked.

As shown in FIG. 7, the diameter of the rotary blade 1 is made larger than twice the diameter of the resin 33, and the rotary blade 1 and the resin 33 are arranged so that the center C1 of the rotary blade 1 deviates from the center C3 of the resin 33. When cutting by relatively moving, the tip of the cutting tool 3 of the rotary blade l comes into constant contact with the resin 33 while pulling, so that the resin 33 and the hollow fiber separation membrane 31 can be cut smoothly. As a result, it is possible to more effectively prevent the deformation of the ends of the hollow heavy S membrane 31 exposed at the ends of the resin 33 and the clogging of the holes of the hollow fibers, and also to improve the finished state of the cut surface. It becomes even better.

To explain this reason more clearly, in general, when cutting an object, a relative action is required between the blade and the object. If you press it vertically against an object, it may not cut, or it may not be sharp enough, or even if it does, it may seriously damage the cut surface. Therefore, the blade must be pulled or pushed to create a relative action for cutting. When cutting with a round blade (rotary blade 1) as in the present invention, although relative action is given by rotating the blade, for example, as shown in FIG. The object (resin)
When cutting by moving toward the center C3 of the object 33, the entire force due to cutting resistance will be applied on the line connecting the center CI of the blade l and the center C3 of the object 33, and the pressing effect will be large. be. In order to reduce this effect, it is necessary to move the direction of the force as much as possible. For example,
This is the cutting mechanism of scissors and jarring machines. These are because the upper and lower blades are angled, and the blades are not parallel.If they were parallel, they would cut only with pressing force, and there would be no pushing or pulling effect. Therefore, as shown in FIG. 7, as shown in FIG. If the cutting is performed while cutting, the pressing pressure due to the cutting resistance is diverted from the direction in which it is applied, thereby reducing the pressing pressure and making the cutting quality even better.As mentioned above, the finish of the cut surface can be improved. It can be made even better.

In short, the rotary blade 1 and the resin 33 only have to be moved relatively, and both the rotary blade 1 and the resin 33 can be moved.

In addition, hollow fiber separation II! 131 in the axial direction (cutting depth per one time), for example, about 0.05 to 0.2 mm, more preferably 0.
．． If you make shallow cuts of about 1mm multiple times,
Cutting can be performed more smoothly and the cut surface can be made smooth.

If this cutting depth is smaller than 0.05 mm, the chips of the resin 33 will not curl in a streamlined shape, so the chips will be cut midway.In this case, the resin 33 has elasticity. On the way, the rotary blade l no longer bites into the resin 33 and ends up simply scraping. On the other hand, if the cutting depth becomes thicker than 0.2 mm, the strength of the cutting edge of the rotary blade l becomes a problem. Cutting resistance increases, causing heat generation and chipping of the blade.

Alternatively, the resin may be roughly cut using a cutting tool other than the present invention, and then cut using the rotary blade of the present invention.

Furthermore, if the peripheral edge of the resin is hemmed in a stepped manner before cutting begins, problems such as chipping of the resin edge during cutting can be avoided.

[Effects] As detailed above, according to the rotary blade of the present invention, the friction area between the rotary blade and the material to be cut is extremely small, so that the frictional heat during cutting can be extremely reduced.

In addition, when cutting the resin of the hollow fiber separation membrane module using this rotary blade, problems such as thermal deformation and cracking of the resin can be solved, and the parts that were once cut with the blade can be removed. Since the sides of the rotating blade will not rub against the sides of the rotating blade, the pores of the hollow fiber separation membrane exposed at the end of the resin will not be crushed.
There is no fear of it being blocked.

[Brief explanation of drawings]

1 is a sectional view of a rotary blade according to an embodiment of the present invention, FIG. 2 is a perspective view of a hollow fiber separation membrane module, FIG. 1 is an enlarged view of the main parts, FIG. 5 is a cross-sectional view of the rotating jig, FIG. 6 is a view taken along the line ■-■ in FIG. 5, and FIG. 7 explains the cutting method according to the embodiment of the present invention. FIG. 8 is a sectional view taken along line 7--7 in FIG. 7, and FIG. 9 is a front view showing a cutting method different from the cutting method shown in FIG. l...Rotary blade, 2...Rotary blade body, 3
...Knife, 4...Step part, 15...
Rotating jig, 18...Tapered surface, 23...Lower side holding member, 24...Upper side holding member, 31...
Hollow fiber separation membrane, 32... Bundle of hollow fiber separation membranes, 33... Upper synthetic resin plate.

Claims (3)

[Claims] (1) In a rotary cutting blade having a cutting edge on the circumference,
A rotary cutting blade characterized by having a concave surface on the side that contacts the material to be cut. (2) In a method of cutting the resin of a hollow fiber separation membrane bundle whose ends are hardened with resin, the resin has a cutting edge on the circumference, and the surface opposite to the side to be attached to the rotating jig is concave. A method for cutting a hollow fiber separation membrane module using a rotary cutting blade, characterized in that the cutting blade is rotated and moved relative to the resin. (3) A patent characterized in that the diameter of the rotary blade is at least twice the diameter of the resin, and cutting is performed by moving the rotary blade relative to the resin so that the center of the rotary blade deviates from the center of the resin. A method for cutting a hollow fiber separation membrane module using the rotary cutting blade according to claim 2.