JP2600891Y2 - Magnetic attracting magnet - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention is applicable to magnetic powders such as iron powder in a liquid.
The present invention relates to a magnet for attracting and removing magnetic substances .

[0002]

2. Description of the Related Art Hitherto, as an iron powder attracting magnet for adsorbing and removing iron powder in a liquid, a structure used for a hydraulic mechanism such as a hydraulic cylinder used in a machine tool shown in FIGS. 7 and 8 has been known.

In the iron powder attracting magnet shown in FIGS. 7 and 8, a plate-shaped magnet portion 51 is made of synthetic resin such that one plane is exposed.
The magnet unit 51 is disposed at the bottom of the tank 53 with the magnet unit 51 facing upward.

Then, oil 55 is sucked from the tank 53 via a feed pipe 54 by a pump (not shown) and pressurized, and the pressurized oil 55 is sent to a hydraulic mechanism such as a hydraulic cylinder (not shown) to operate the hydraulic mechanism. The oil 55 used in the mechanism returns to the tank 53 again through the return pipe 56, and the magnetic material such as iron powder and sludge contained in the oil 55 returned to the tank 53 is exposed to the magnet portion where the iron powder adsorption magnet 50 is exposed. Adsorbed on 51 to remove magnetic substances from oil.

However, since the iron powder attracting magnet 50 shown in FIGS. 7 and 8 is disposed at the bottom of the tank 53, minute iron powder or sludge floats on the oil 55 surface.
As it moves near the center of the tank 53 due to the flow of the oil 55,
The removal rate of the magnetic substance in the oil 55 is low, and there is a possibility that the hydraulic mechanism or the like may be damaged by the magnetic substance that cannot be completely removed.

Therefore, there is known an iron powder attracting magnet having a structure shown in FIG. 9 in which the removal rate of magnetic substances in the oil 55 is improved.

The iron powder attracting magnet shown in FIG. 9 is formed by erecting a columnar magnet part 61 which is magnetized in a radial direction on a substrate 62 with the axial direction extending vertically. Powder adsorption magnet
60 is replaced with a tank 53 as in the conventional example shown in FIGS.
Is located at the bottom. Further, a magnet in which the magnet portion 61 is magnetized in the axial direction is also known.

However, the iron powder adsorption magnet shown in FIG.
Stone 60 has oil 55 in the middle of the pole because the magnetic force is reduced.
The magnetic pole of the magnet part 61 is located near the center of the tank where the flow velocity is fast.
Magnetic substances such as iron powder adsorbed in the middle part of the
In addition to reducing the amount of adsorption,
The hydraulic mechanism may be damaged.

Therefore, magnetic substances such as iron powder can be removed even in a strong flow.
For holding by suction, for example, Japanese Utility Model Laid-Open No. 4-37514
Is known.

[0010] Japanese Unexamined Utility Model Application Publication No.
The one with a cross-shaped cross section and a groove in the circumferential direction
It is formed in a substantially columnar shape that produces different magnetic poles.

[0011]

The present invention is, however, the real
In the one described in Japanese Unexamined Patent Publication No. 4-37514,
Since different magnetic poles are generated, it is similar to the configuration shown in FIG.
The middle portion of the pole since the magnetic force decreases, the magnetic force
At the part where it decreases, the suction power decreases, and the suction can be sufficiently held.
There is no problem .

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a magnetic substance attracting magnet for efficiently removing magnetic substances in a liquid.

[0013]

A magnetic substance- absorbing magnet according to claim 1 is a magnetic substance- absorbing magnet that adsorbs a magnetic substance contained in a liquid. almost caused a different magnetic poles
The main body has a columnar shape, and the main body is annularly provided on the outer peripheral surface along the circumferential direction, and has different magnetic poles at edges facing in the axial direction.
A twisting groove is provided .

[0014] Magnetic material adsorbing magnet according to claim 2, in the magnetic matter adsorption magnet according to claim 1, the body of the axial both
It has a different magnetic pole at the end and an annular groove on the outer peripheral surface along the circumferential direction
A plurality of magnet sections provided with a section, and a yoke plate interposed between the magnet sections, wherein the plurality of magnet sections are different.
The magnetic poles are arranged coaxially opposite to each other.

The magnetic matter adsorption magnet according to claim 3, in the magnetic matter adsorption magnet according to claim 1 or 2, a substrate, and a mounting means for erecting substantially columnar body to the base body, wherein the body the the magnetic pole you located in the axial tip is adjacent
Those in which a plurality erected by varying the magnetic pole located at the top of the body.

[0016]

In the magnetic attraction magnet according to the first aspect, an annular groove is provided along the circumferential direction on the outer peripheral surface of the main body where different magnetic poles are formed at both ends in the axial direction, and near the edge of the groove facing the axial direction of the main body. in order to form different magnetic poles, the magnetic force of the surface of the body
There as well as reducing the portion of reducing, since the magnetic force is increased, to reduce the release of the magnetic material in the adsorbed liquid, efficiently remove magnetic material.

A magnetic attraction magnet according to a second aspect of the present invention is the magnetic attraction magnet according to the first aspect, wherein the magnetic attraction magnet has different magnetic poles at both ends in the axial direction and has an outer peripheral surface formed in an annular shape along the circumferential direction. Groove provided
Yoke plate with multiple magnets
Since the formation of the body and arranged coaxially interposed between the,
To form the axial end near to the different poles of the body, to form different magnetic poles on the edge near the opposite in the axial direction of the groove, as well as reducing the portion where the magnetic force of the surface of the body is reduced, the magnetic force Because of the increase, separation of the magnetic substance in the adsorbed liquid is reduced, and the magnetic substance is efficiently removed.

According to a third aspect of the present invention, there is provided the magnetic attraction magnet according to the first or second aspect , wherein the magnetic poles located at the axial ends of the adjacent main bodies are different from each other, and are attached to the base by the mounting means. to more upright, and the magnetic force by the different magnetic poles occur in the axial direction at both ends of the body itself, in the axial direction of the groove
A magnetic force is generated by different magnetic poles generated in the vicinity of the opposing edge and a magnetic force is generated by different magnetic poles between adjacent main bodies, and the magnetic force is increased, so that the amount of magnetic substance adsorbed in the liquid is increased. Is removed.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a magnetic attraction magnet according to the present invention will be described below with reference to the drawings.

1 and 2, reference numeral 1 denotes an iron powder attracting magnet as a magnetic substance attracting magnet.
The main body is composed of a substantially cylindrical magnet main body 2 as a main body, and a base body 3 which stands on the magnet main body 2 in the vicinity of four corners along the vertical direction in the axial direction.

The base 3 is made of, for example, a synthetic resin and is formed in a substantially square flat plate with four corners chamfered in an arc shape. Nuts 5 are embedded near the four corners of the base 3, and a washer 6 is embedded on the upper surface of the nut 5 such that the upper surface is flush with the upper surface of the base 3. Further, a through hole 8 that is continuous with the female screw portion 7 of the nut 5 is formed in the washer 6 at substantially the center.

On the other hand, as shown in FIGS. 1 to 3, the magnet body 2 has a substantially cylindrical magnet portion 11 having a substantially disc-shaped yoke plate 12.
, And are integrally fixed on the same axis.

The magnet portion 11 is made of a material obtained by appropriately mixing magnetic powder such as strontium (Sr) -ferrite having a particle size adjusted to 200 mesh or less with various additives in a synthetic resin such as nylon. Is injection-molded in a magnetic field to make the powder of the magnetic material anisotropic, and is formed in a substantially columnar shape. An insertion hole 13 is formed substantially in the center of the magnet portion 11 along the axial direction.

Further, on the outer peripheral surface of the magnet portion 11, for example, two annular grooves 14 are formed along the circumferential direction.

The yoke plate 12 is made of, for example, soft iron, has a disk shape having substantially the same diameter as the magnet portion 11, and has a through hole 8 formed substantially at the center corresponding to the insertion hole 13, and has a washer portion. As shown in FIG.

[0026] Then, as the magnetic poles of the axial end face of the magnet portion 11 are different, coaxially to sandwich the yoke plate 12, the substrate 3
On the washer 6. Further, a bolt 15 as an attachment means is inserted into the insertion hole 13 of the laminated magnet portion 11, and is screwed and fixed to the female screw portion 7 of the nut 5 through the through hole 8 of the washer portion 6 of the base 3. The magnet main body 2 is formed in a substantially columnar shape.

The magnet bodies 2 erected near the four corners of the base 3 are alternately erected at corresponding positions in the horizontal direction so that the magnetic poles formed on the outer peripheral surface are different.

The magnet body 2 is attached to the iron powder attracting magnet 1.
So they poles of the axial end face of the magnet portion 11 are different, because they are formed are alternately stacked coaxially to sandwich the yoke plate 12, the magnet body 2, as shown in FIG. 1, A magnetic field is formed for each magnet unit 11. Further, the magnet section 11
Since the groove 14 is formed on the outer peripheral surface of the magnet body 2, different magnetic poles are formed near the edge of the groove 14 opposed along the axial direction of the magnet main body 2. Are formed.

In the iron powder adsorbing magnet 1, the magnet main bodies 2 are alternately erected on the base 3 so that the magnetic poles at the corresponding positions in the horizontal direction of the adjacent magnet main bodies 2 are different.
As shown in FIG. 2, a magnetic field is also formed between the magnet main bodies 2 and 2.

Next, the operation of the above embodiment will be described.

The iron powder attracting magnet 1 in which the magnet body 11 is formed by fixing the magnet portion 11 to the base 3 with the bolts 15 is disposed, for example, at the bottom of a tank for storing oil to be sent to a hydraulic mechanism (not shown) for operation. I do.

Then, magnetic substances such as iron powder and sludge (not shown) contained in the oil circulating in the tank and the hydraulic mechanism are captured by the magnetic field between the magnet bodies 2 and 2 and the magnetic field of the magnet portion 11 of the magnet body 2. It is adsorbed on the outer peripheral surface of the magnet main body 2 and is removed from the oil.

The above embodiment, the magnet body 2, as the magnetic poles of the axial end face of the magnet portion 11 are different, are formed are alternately stacked coaxially to sandwich the yoke plate 12. For this reason, as shown in FIG.
Each time, a magnetic field is formed. Further, since a groove is formed on the outer peripheral surface of the magnet portion 11, a different magnetic pole is formed near the edge of the groove 14 facing in the axial direction, and by forming this magnetic pole,
A magnetic field is also formed near the edge of the groove 14.

Accordingly, magnetic poles are formed at both ends in the axial direction and both sides in the radial direction of the conventional magnet main body 2 , and a decrease in magnetic force generated at an intermediate position between the magnetic poles can be prevented. Exists, the magnetic force increases, the adsorption force of magnetic substances such as iron powder and sludge contained in oil increases,
The adsorbed magnetic material can be hardly peeled off.

The magnet main body 2 is connected to the adjacent magnet main body 2.
Horizontal as magnetic poles formed on the outer circumferential surface of the corresponding positions are different, and are more upright staggered substrate 3. Therefore, a magnetic field is also formed between the magnet main bodies 2 and 2,
Since the magnetic force of the iron powder attracting magnet 1 increases and a magnetic field for capturing magnetic substances such as iron powder and sludge contained in oil is formed in a wide range, the magnetic substance such as iron powder and sludge contained in oil is generated. The amount of adsorption can be increased.

Next, a second embodiment of the magnetic attraction magnet according to the present invention will be described with reference to FIG.

The second embodiment shown in FIG. 3 is obtained by forming three grooves 14 in the magnet main body 2 of the first embodiment shown in FIGS.

Therefore, as in the first embodiment, the yoke plate 12 is sandwiched between the iron powder adsorbing magnet 1 and the magnet body 21 so that the magnetic poles at the axial end faces of the magnet portion 22 are different. Since the magnets 21 are alternately stacked on each other, a magnetic field is formed in the magnet main body 21 for each magnet portion 22. Further, since the groove portion 14 is formed on the outer peripheral surface of the magnet portion 22, different magnetic poles are formed near the edge of the groove portion 14 facing in the axial direction. Due to the formation of this magnetic pole, a magnetic field is also generated near the edge of the groove portion 14. Is formed.

Further, since the iron powder absorption magnet 1, the horizontal direction of the magnetic poles of the corresponding position of the magnet body 21 magnet body 21 are adjacent are more upright on differently staggered substrate 3, the magnet body A magnetic field is also formed between 21 and 21.

Accordingly, a magnetic field is formed in the magnet main body 21 for each magnet portion 22 and a magnetic field is formed by forming a magnetic pole near the edge of the groove portion 14, so that the conventional magnetic field is formed as in the first embodiment. Magnetic poles are formed on both ends in the axial direction and on both sides in the radial direction of the magnet main body, and a magnetic force generated at an intermediate position between the magnetic poles can be prevented from being reduced. The magnetic force exists on the entire surface of the magnet main body 21 and increases. As a result, the adsorbing force of magnetic substances such as iron powder and sludge contained in the oil increases, and the adsorbed magnetic substances can be hardly peeled off.

Further, a magnetic field is also formed between the magnet main bodies 21, 21 to increase the magnetic force of the iron powder attracting magnet 1, and to form a wide magnetic field for catching magnetic substances such as iron powder and sludge contained in oil. Therefore, the amount of magnetic substances such as iron powder and sludge contained in the oil can be increased.

Next, a third embodiment of the magnetic attraction magnet according to the present invention will be described with reference to FIG.

In FIG. 4, reference numeral 31 denotes a magnet main body. The magnet main body 31 has a magnet portion 32 with a substantially disc-shaped yoke plate 12 interposed therebetween, as in the first embodiment shown in FIGS. It is constructed by integrally fixed coaxially <br/> Te.

The magnet section 32 is formed by laminating disk sections 33 in the axial direction. The disk portion 33 is formed by injection molding in a magnetic field a material obtained by appropriately mixing a magnetic powder such as strontium (Sr) -ferrite with various additives in a synthetic resin such as nylon, to thereby form a magnetic powder. It is anisotropic and formed in a thin cylindrical shape. Also, this disk part
At substantially the center of 33, an insertion hole is formed in an axial direction (not shown), and is formed in a substantially annular shape. Further, a tapered surface 34 that is inclined outward is formed on the periphery of the disk portion 33.

As in the first embodiment, the yoke plate 12 is formed in a disk shape having a diameter substantially equal to the diameter of the disk portion 33, and is formed in an annular shape having a through hole (not shown). .

Then, two coaxial parts are placed on the washer part 6 of the base (not shown) so that the magnetic poles at the axial end faces of the disk part 33 are different.
An annular groove 35 is stacked on the
Is formed. Further, three disk portions 33 are stacked coaxially on the upper surface of the magnet portion 32 so as to sandwich the yoke plate 12 so that the polarities of the end surfaces are different, and an annular groove portion 35 is formed on the opposed tapered surface 34. Is formed. Further, the yoke plate 12 is sandwiched between the grooves 14.
A magnet portion 36 similar to the magnet portion 11 of the first embodiment, which does not have the same , is laminated coaxially. Further, a bolt (not shown) is inserted into each insertion hole of the magnet portion 32 formed by laminating the disk portion 33, and is screwed and fixed to a female screw portion of a nut (not shown) through a through hole of the washer portion of the base. The magnet body has a substantially cylindrical shape
31 are formed.

[0047] Incidentally, the magnet body 31, as in the first embodiment, at the corresponding position in the horizontal direction, so that the magnetic poles formed on the outer peripheral surface different, are alternately plurality erected.

The iron powder adsorption magnet 1 has a magnet body 31
So they poles of the axial end face of the magnet portion 32 are different, because they are formed are alternately stacked coaxially to sandwich the appropriate yoke plate 12, the magnet body 31, each between the yoke plate 12 A magnetic field is formed. Further, a different magnetic pole is formed near the edge of the opposing tapered surface 34 by the tapered surface 34 of the magnet part 32 between the yoke plates 12, and by forming this magnetic pole,
A magnetic field is also formed near the edge of the groove 35.

In the iron powder adsorbing magnet 1, a plurality of magnet main bodies 31 are alternately provided on the base such that the magnetic poles at corresponding positions in the horizontal direction of the adjacent magnet main bodies 31 are different from each other. , 31 also form a magnetic field.

Therefore, similar to the first embodiment,
In the magnet main body 31, a magnetic field is formed for each magnet portion 32, and a magnetic field is formed by the formation of magnetic poles near the edge of the tapered portion 34, so that both ends in the axial direction and both sides in the radial direction of the conventional magnet main body are formed. A magnetic pole is formed, and a decrease in the magnetic force generated at an intermediate position between the magnetic poles can be prevented. The magnetic force is present on the entire surface of the magnet main body 31, the magnetic force is increased, and iron powder and sludge contained in oil are removed. The attraction force of the magnetic substance is increased, and the adsorbed magnetic substance can be hardly peeled off.

Further, a magnetic field is also formed between the magnet main bodies 31, 31, so that the magnetic force of the iron powder attracting magnet 1 increases and a magnetic field for catching magnetic substances such as iron powder and sludge contained in oil is formed in a wide range. Therefore, the amount of magnetic substances such as iron powder and sludge contained in the oil can be increased.

Next, an experiment of iron powder adsorption by the magnet body of each of the above embodiments was performed.

The magnet bodies 2, 21 and 31 of the respective embodiments were each replaced with a magnet part having a diameter of about 18 mm by a yoke plate 1 having a thickness of about 1.5 mm.
Three layers are formed so that the distance between 2 and 12 is about 12.5 mm. Next, these magnet bodies 2, 21, 31 are fixed to the base body 3 with bolts 15 so that the interval is approximately 28 mm.
Test specimens were formed. As a comparative test piece, a conventional cylindrical magnet part 51 without the yoke plate 12 shown in FIG. 9 was used, and a magnet part having no groove 14 on the outer peripheral surface shown in FIG.
The magnet body 41 was formed by mounting the yoke plate 12 with the yoke plate 12 sandwiched therebetween.

Then, the magnet part 11,
Measure the surface magnetic flux density at each position in the axial direction of 22, 32, and 36, and adsorb the powder of the magnetic material with a particle size of 200 mesh or less, which is the raw material of the magnets 11, 21, 22, and 36, to the specimen. And the amount of adsorption was measured. FIG. 5 shows the measurement results of the surface magnetic flux density, and Table 1 shows the measurement results of the adsorption amount.

[0055]

[Table 1] From the results shown in FIG. 5, it can be seen that the provision of the groove 14 changes the surface magnetic flux density in a complicated manner depending on the location. In addition to the magnetic field being formed at both axial ends of the magnet,
It can be seen that a magnetic field is also formed in the groove 14. Further, it was found that the maximum surface magnetic flux density at both ends in the axial direction of the magnet portions 11, 21, 22, and 36 was increased by about 36% or more compared with the comparative example not using the yoke plate 12. It can be seen that the adsorbing force for adsorbing a magnetic substance such as iron powder increases due to the increase in the force, and the magnetic substance such as the adsorbed iron powder is hard to peel off.

Further, from the results shown in Table 1, it can be seen that the amount of iron powder adsorbed in the first and second examples is larger than that in the comparative example in which the groove 14 is not provided.

Further, it can be seen that the second embodiment, in which the number of the grooves 14 is larger than that in the first embodiment, increases the amount of iron powder adsorbed.

Therefore, the magnetic force of the magnet bodies 2, 21 and 31 increases, and the magnetic substance such as the iron powder adsorbed by the increase of the iron powder attracting force is hardly peeled off. The magnetic force generated by the formation of the magnetic field increases, and the amount of magnetic substances such as iron powder and sludge adsorbed by the magnetic field in a wide range can be increased.

In each of the above embodiments, the magnet bodies 2, 21 and 31 are formed by laminating disk portions 33 having different diameters as in the third embodiment, and having the groove portions 14 due to the difference in diameter. Such as to form the groove portion 14 by any method,
Similar effects can be obtained.

Also, it has been described that the magnet portions 11, 22, and 32 are provided with the insertion holes 13 and the bolts 15 as mounting means are inserted into the insertion holes 13 to form the magnet main bodies 2, 21, and 31, respectively. The magnet portions 11, 22, and 32 are formed in a substantially columnar shape without providing the insertion holes 13, and are joined with an adhesive or fixed and held by a holding body such as a clip to form the magnet main bodies 2, 21, and 31. For example, any means can be used. Further, the magnet bodies 2, 21, 31
Was explained with the bolts 15 attached to the base 3, but the tank of the hydraulic mechanism was used as the base, and the magnet bodies 2, 2
1, 31 can also be attached directly.

[0061]

[Effect of the invention] According to the magnetic matter adsorption magnet according to claim 1, set only the annular groove in the outer peripheral surface of the body that different magnetic poles are generated at both ends in the axial direction along the circumferential direction, opposite to the axial direction of the main body to order to form different magnetic poles near the edge of the groove, the body
The portion of the surface where the magnetic force decreases can be reduced,
Since the magnetic force can be increased, the separation of the magnetic substance in the adsorbed liquid can be reduced, and the magnetic substance can be efficiently removed.

According to the magnetic attraction magnet of the second aspect,
2. The magnetic attraction magnet according to claim 1 , wherein both ends in the axial direction are provided.
Groove annularly in the circumferential direction on the outer peripheral surface has a different magnetic poles
Yo are opposed to a plurality of magnet portions, different magnetic poles provided
Since the formation of the body and arranged coaxially interposed between the chromatography click plate, it is possible to form a magnetic pole different near both ends in the axial direction of the body, forming a different magnetic poles on the edge near the axially opposite the groove Therefore, the portion of the surface of the main body where the magnetic force is reduced can be reduced, and the magnetic force can be increased. Therefore, the separation of the magnetic substance in the adsorbed liquid can be reduced, and the magnetic substance can be removed efficiently.

According to a third aspect of the present invention, there is provided the magnetic attraction magnet according to the first or second aspect , wherein the magnetic poles located at the axial ends of the adjacent main bodies are made different from each other, and are attached to the base by the mounting means. to more upright, and the magnetic force by the different magnetic poles occur in the axial direction at both ends of the body itself, in the axial direction of the groove
A magnetic force due to different magnetic poles generated near the opposing edge and a magnetic force due to different magnetic poles between adjacent main bodies are generated, the magnetic force can be increased, the amount of magnetic substance adsorbed in the liquid can be increased,
Magnetic substances can be removed efficiently.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a first embodiment of a magnetic attraction magnet according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view showing a second embodiment of the magnetic attraction magnet according to the present invention;

FIG. 4 is a side view showing a third embodiment of the magnetic attraction magnet according to the present invention;

FIG. 5 is a graph illustrating a surface magnetic flux density of each embodiment of the magnetic attraction magnet of the present invention.

FIG. 6 is a side view showing a magnet main body of a comparative example for explaining the surface magnetic flux density.

FIG. 7 is a perspective view showing one embodiment of a conventional iron powder attracting magnet.

FIG. 8 is a cross-sectional view showing a state where the hydraulic mechanism is used.

FIG. 9 is a perspective view showing another embodiment of the conventional iron powder attracting magnet.

[Explanation of Signs] 1 Iron powder attracting magnet as a magnetic substance attracting magnet 2, Magnet body as a main body 3, 21, 31 3 Bases 11, 22, 32, 36 Magnet section 12 Yoke plate 14 Groove section 15 Bolt as mounting means

Continuation of the front page (56) References JP-A-63-296886 (JP, A) JP-A-61-271043 (JP, A) JP-A-4-37514 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) B03C 1/00-1/32 B23Q 11/00

Claims (3)

(57) [Scope of request for utility model registration] 1. A magnetic material for adsorbing a magnetic substance contained in a liquid.
In things adsorption magnets, have a substantially columnar body having different magnetic poles generated at both ends in the axial direction
And, the body groove provided to produce different magnetic poles in opposite edges in the axial direction is provided annularly along the outer peripheral surface in the circumferential direction
A magnetic attraction magnet characterized by being made . 2. The main body has different magnetic poles at both ends in the axial direction, and has a circumferential surface along an outer peripheral surface.
And a yoke plate interposed between the magnet portions , wherein the plurality of magnet portions are arranged coaxially with different magnetic poles facing each other.
2. The magnetic attraction magnet according to claim 1, wherein the magnet is provided. 3. A base, and mounting means for erection of a substantially columnar main body on the base,
It said body, before magnetic pole you located in the axial tip is adjacent
The magnetic attraction magnet according to claim 1 or 2, wherein a plurality of magnetic poles are provided so as to be different from the magnetic pole located at the tip of the main body .