JP2510180Y2 - Fixed flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a fixing flange that is attached to and detached from a shaft member by using hydraulic pressure or the like.

[Prior Art] Conventionally, as a fixing flange of this type, for example, as shown in FIG. 3, a flange main body 1 having a substantially cylindrical shape and a rotary shaft S formed on the axis of the flange main body 1 are inserted. Through hole 2, a hydraulic chamber 3 formed coaxially with the through hole 2 and filled with hydraulic oil O therein, and a hydraulic chamber 3 extending in the radial direction of the flange body 1 at both ends. A cylinder 4 opening to the outer peripheral portion of the flange body 1, and the cylinder 4
A piston 5 that is inserted into the cylinder to close the hydraulic chamber 3, a cap 6 that is attached to the outer peripheral portion of the flange body 1 with a bolt 6a and closes the opening of the cylinder 4, and is screwed to the cap 6. It has a pressure adjusting screw 7 whose tip comes into contact with the piston 5, and a groove portion 8 which is formed at the outer peripheral end of the flange body 1 and in which a disk-shaped tool C such as a rotary knife is coaxially attached. Things are known.

In the fixed flange 1 configured as described above, the amount of screwing of the pressure adjusting screw 7 is changed to firmly fix the tool C to an arbitrary position on the rotary shaft S, or to rotate the rotary shaft S. It can be easily removed from S.

That is, when the pressure adjusting screw 7 is tightened, the piston 5 that comes in contact with the pressure adjusting screw 7 is pressed against the radial center side of the flange body 1 and the volume of the hydraulic chamber 3 decreases, so that the hydraulic oil O in the hydraulic chamber 3 is reduced. Is compressed and its pressure rises.
Therefore, the inner peripheral surface of the through hole 2 separated from the hydraulic chamber 3 by a slight distance is pressed toward the center in the radial direction and is brought into close contact with the outer peripheral surface of the rotating shaft S, thereby moving the tool C in the axial direction. The tool C is restrained and fixed to the rotation axis S.

On the other hand, when the pressure adjusting screw 7 is loosened, the piston 4
Receives the pressure of the hydraulic oil O and retreats to the outer peripheral side in the radial direction of the flange, so that the volume of the hydraulic chamber 3 increases and the pressure of the hydraulic hydraulic oil O decreases. As a result, the diameter of the through hole 2 increases. The inner peripheral surface thereof is separated from the outer peripheral surface of the rotation shaft S. Therefore, it is possible to move the tool C together with the flange main body 1 in the axial direction to change the fixed position thereof or to easily remove the tool C from the rotary shaft S.

By the way, in such a fixed flange, as the pressure of the hydraulic oil O increases, the inner peripheral surface of the through hole 2 is evenly pressed to the center side in the tool radial direction over almost the entire surface. Although there is an advantage in that the runout accuracy of the rotary shaft S with respect to the rotary shaft S becomes high, foreign matter such as dust or oil may be present between the inner peripheral surface of the through hole 2 and the outer peripheral surface of the rotary shaft S when mounted on the rotary shaft S. When it enters and is bitten, the flange body 1 is tilted and fixed, so that the runout accuracy of the flange body 1 and the tool C immediately deteriorates.

For this reason, conventionally, for example, as shown in FIG. 4, there is a structure in which seal members 9 such as oil seals are provided at both ends of the through hole 2 to prevent foreign matter from entering the through hole 2. Was offered. In the fixing flange shown in FIG. 4, reference numerals 10 and 11 are rings for holding the sealing material, 12 is a presser for the tool C, and foreign matter is prevented from entering between the contact surfaces of the ring 11 and the tool C. It is a rubber ring for supporting the workpiece cut by the tool C, or has a function of pressing the workpiece by utilizing its elasticity.

[Problems to be Solved by the Invention] However, when the seal members 9 are disposed at both ends of the through hole 2 as a measure against foreign matter intrusion as in the above-described conventional example, the flange body 1 is moved along the rotation axis S. At this time, the sliding resistance of the seal member 9 acts, which impairs the smooth movement of the flange body 1.

In addition, when the seal member 9 is attached, it is necessary to form the predetermined seal grooves 13 on both end sides of the through hole 2, so that there is a drawback that the axial length of the entire flange becomes long.

In addition, the force by which the seal member 9 presses the rotating shaft S in the radial direction tends to vary in the circumferential direction due to the manufacturing error of the seal member 9, the processing error of the seal groove 13, and the like. The accuracy was sometimes adversely affected. On the other hand, if the force with which the seal member 9 presses the rotating shaft S is set to be small in order to eliminate such a defect, the sealability of the seal member 9 deteriorates, and intrusion of foreign matter to some extent cannot be avoided.

Further, dust and the like are caught between the seal member 9 and the rotary shaft S during repeated attachment / detachment to / from the rotary shaft S to damage the seal member 9, or the outer peripheral surface of the rotary shaft S is scratched to seal the seal. There is also a drawback in that it may not be able to withstand long-term use, since it may deteriorate its performance.

This idea was made in such a background,
An object of the present invention is to provide a fixed flange that can prevent foreign matter from entering between the inner peripheral surface of the flange and the shaft member without using a sealing member.

[Means for Solving the Problems] In order to solve the above problems, a fixing flange of the present invention has an insertion hole into which a shaft member is inserted, and a pressure chamber provided around the insertion hole. An intake hole, which is a fixed flange, is opened to the outer surface of the fixed flange and is connected to a gas supply means installed outside the fixed flange, and an open end portion of the insertion hole that communicates with the intake hole. And a gas supply passage through which the compressed gas supplied from the gas supply means to the intake hole is exhausted around the opening end of the insertion hole.

[Operation] According to the above configuration, by supplying the compressed gas to the intake hole from the gas supply means installed outside the fixed flange, the compressed gas is supplied to the intake hole through the gas supply passage communicating with the intake hole. Since air is exhausted around the opening end, foreign matter such as dust is prevented from entering the inside of the insertion hole. Therefore, it is not necessary to provide a seal member or the like at the open end of the insertion hole.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.

In FIG. 1, reference numeral 20 is a flange main body. The flange main body 20 has a substantially cylindrical shape, and a groove portion 21 into which a disc-shaped tool C such as a rotary knife is fitted is formed at one end thereof.

On the other hand, on the axis of the flange body 20, a through hole (insertion hole) 22 that penetrates the flange body 20 in the axial direction is formed. A rotary shaft (shaft member) S for rotating the tool C is inserted into the through hole 22, and the inner diameter of the through hole 22 is equal to that of the rotary shaft S.
Is slightly larger than the outer diameter of.

A hydraulic chamber (pressure chamber) 23 is formed around the through hole 22 inside the flange body 1. The hydraulic chamber 23 is formed in a ring shape that is coaxial with the through hole 22, and the wall thickness between the inner peripheral side wall surface and the inner peripheral surface of the through hole 22 depends on the pressure change in the hydraulic chamber 23. Is thin enough to deform. On the outer peripheral side of the hydraulic chamber 23, a cylinder 24 extending in the radial direction of the flange main body 20 and having both ends opened to the hydraulic chamber 23 and the outer peripheral portion of the flange main body 20 is formed.
The hydraulic oil O is injected into the hydraulic chamber 23 via the cylinder 24.

A cylinder-shaped piston 25 is slidably inserted into the cylinder 24. An O-ring 26 is fitted on the outer peripheral portion of the piston 25.
23 is liquid-tightly sealed to the outside of the flange. Further, a concave portion 27 is formed at an opening end of the cylinder 24 on the outer peripheral side of the flange, and a cap 28 is fitted in the concave portion 27 and fixed by a bolt 29. This cap 28 is for closing the cylinder 24 and has a pressure adjusting screw 30 at the center thereof.
Are screwed together. The tip of the pressure adjusting screw 30 is in contact with the rear end surface of the piston 25.

A hose connector 31 is attached to the outer peripheral portion of the cylinder body 20 at a position spaced a predetermined distance from the cylinder 24 in the circumferential direction. The hose connector 31 can be fitted with a tip end of a gas hose (not shown) extending from a gas supply means (not shown) installed outside the fixed cylinder, for example, an air pump or the like, and inside the The hose connector 31 penetrates the cylinder body 20 in the radial direction, and the compressed gas supplied from the gas supply means through the gas hose is supplied to the cylinder body.
An intake hole 31a that leads to the inside of 20 is formed.

Then, inside the flange body 20, the intake hole 31a is formed.
A vent hole 32 is formed that communicates with. This vent 32
After once extending from the end of the intake hole 31a toward the radial center side of the flange body 20, it branches to the left and right in the axial direction of the flange body 20 and opens at both end surfaces of the flange body 20.

Further, a rubber pressing plate 33 forming the ring is attached to an end of the flange body 20 on the side where the groove 21 is provided. The rubber pressing plate 33 is for holding the rubber ring 34 that presses the tool C mounted in the groove portion 21, and its inner diameter is set to be larger than that of the through hole 22. Further, an annular recess 35 coaxial with the through hole 22 is formed in a portion of the end surface of the rubber pressing plate 33 facing the opening end of the ventilation hole 32, whereby the recess 35 and the end surface of the flange body 20. clearance by the S _2, the intake hole between the gap S _1, and the inner peripheral surface 36 of the rubber pressing plate 33 and the rotary shaft S between the
A first exhaust passage 37 is formed for exhausting the compressed air supplied from 31a to the ventilation hole 32 outward in the axial direction of the through hole 22.

On the other hand, a cover 38 having a thin plate ring shape is attached to the opposite end of the flange body 20. This cover 38
The inner diameter of the same is set to be larger than the through hole 22 like the rubber pressing plate 33 described above, and a portion of the end face facing the opening end of the ventilation hole 32 has an annular shape coaxial with the through hole 22. A recess 39 is formed. As a result, in the gap S ₃ between the recess 39 and the end surface of the flange main body 20 and the gap S ₄ between the inner peripheral surface 38a of the cover 38 and the rotary shaft S, the compression supplied to the ventilation hole 32 is performed. A second exhaust passage 40 for exhausting air outward in the axial direction of the through hole 22 is formed, and the gas supply passage 41 in the present embodiment is constituted by the ventilation hole 32 and the first and second exhaust passages 37, 40. Has been done.

Therefore, according to the fixing flange configured as described above, the amount of screwing of the pressure adjusting screw 30 is changed to change the piston.
By moving 25, the volume of the hydraulic chamber 23 is increased or decreased and the pressure of the hydraulic oil O inside is changed.
Expands and contracts, so that when the pressure adjusting screw 30 is tightened, the inner peripheral surface of the through hole 22 and the rotary shaft S are brought into close contact with each other and the flange main body 20 is fixed, and When the screw 30 is loosened, the inner peripheral surface of the through hole 22 has the rotation axis S
Away from the rotary shaft S, and as a result, the flange body 20 can be moved with respect to the rotary shaft S or can be removed from the rotary shaft S.

In addition, according to the fixing flange of this embodiment, the through hole 22
By supplying compressed air from the gas supply means to the intake hole 31a with the rotary shaft S inserted through the compressed air, the compressed air is supplied from the exhaust paths 37, 40 of the gas supply path 41 to both ends of the through hole 22. The gas is exhausted and further ejected outward in the axial direction of the through hole 22, so that foreign matter such as dust is prevented from entering the inside of the through hole 22. Therefore, it is not necessary to provide seal members at both ends of the through hole 22, and therefore the through hole 22
It is possible to eliminate all the drawbacks such as increase of sliding resistance and deterioration of run-out accuracy due to the provision of the seal members at both ends, and increase of the flange length due to the formation of the seal groove.

Moreover, since no consumable parts such as oil seals are used to prevent the entry of foreign matter, the parts can withstand long-term use, the parts can be easily maintained and managed, and exhaust from the gas supply passage 41 is also possible. Since the compressed air to be generated keeps the force of pressing the rotating shaft S in the radial direction evenly, there is no new cause for deteriorating the runout accuracy of the flange body 20 and the tool C.

In the present embodiment, in particular, in the gas supply passage 41, the rubber pressing plate 33 and the cover 38 attached to both ends of the flange body 20 in order to form the first and second exhaust passages 37 and 40.
The inner diameter of the flange is formed larger than that of the through hole 22 and the recesses 36 and 39 are formed in these, but the present invention is not limited to this. For example, as shown in FIG. The exhaust passages 37, 40 may be provided on the inner peripheral side and the end face side of the covers 42, 43 embedded in the. In this case, there is an effect that the axial length of the entire flange becomes short.

Further, particularly in the present embodiment, one intake hole 31a is provided in the outer peripheral portion of the flange main body 20, and the compressed air supplied to the intake hole 31a is branched by the ventilation holes 32 and guided to both ends of the flange main body 20. However, the present invention is not limited to this, and the structure is not limited as long as compressed air can be guided to the first and second exhaust passages 37 and 40 on both ends of the through hole 22. . Further, in the present embodiment, the gas supply passage 41 is opened at both ends of the through hole 22 by forming the exhaust passages 37, 40 at both end sides of the through hole 22, but If the insertion direction is limited to one direction,
It suffices to open the gas supply passage only at the end on the side where the rotary shaft S is inserted. Further, the insertion hole through which the rotary shaft S is inserted is not necessarily limited to the through hole 22 having both ends open.

Further, in the present embodiment, the compressed air is supplied to the intake hole 31a, but it is needless to say that various other gases can be used. In addition, in the present embodiment, the fixing flange for holding the tool C such as a rotary knife has been described as an example. However, the present invention is not limited to this, and is applied to other fixing flanges used in various applications. it can.

[Advantage of the Invention] As described above, according to the present invention, by supplying the compressed gas to the intake hole, the compressed gas is exhausted to the periphery of the opening end of the insertion hole through the gas supply passage. Furthermore, it jets outward from the opening end of the insertion hole in the axial direction, which prevents foreign matter from entering the two parts of the insertion hole, so that the sealing member is removed from the end of the insertion hole. It is possible to eliminate all the drawbacks such as increase of sliding resistance, deterioration of runout accuracy, increase of flange width, etc. due to the seal member. As a result, excellent runout accuracy originally possessed by the fixed flange, and attachment / detachment to the shaft member It has an excellent effect that advantages such as ease can be fully exerted.

[Brief description of drawings]

1 is a cross-sectional view showing one embodiment of the present invention, FIG. 2 is a cross-sectional view showing another example of the present invention, FIG. 3 is a cross-sectional view showing a conventional example, and FIG. FIG. 20 …… Flange body, 22 …… Through hole (insertion hole), 23 ……
Hydraulic chamber (pressure chamber), 31a ... intake hole, 41 ... gas supply path.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masayuki Inoue Masayuki Inoue 1528 Nakanishi, Yokoi, Kobe, Anpachi-gun, Gifu Prefecture Mitsubishi Metals Co., Ltd. Gifu Works (56) References ) Actual development Sho 63-127819 (JP, U)

Claims (1)

(57) [Scope of utility model registration request] 1. A pressure chamber is provided which has an insertion hole into which a shaft member is inserted and which surrounds the insertion hole. By changing the pressure of the working fluid filled in the pressure chamber, A fixed flange that expands and contracts the insertion hole to bring the inner peripheral surface of the insertion hole into close contact with and separate from the outer periphery of the shaft member, the flange being opened on the outer surface of the fixed flange and installed outside the fixed flange. An intake hole connected to the gas supply means, and a compressed gas that communicates with the intake hole and opens at the opening end of the insertion hole to supply the compressed gas supplied from the gas supply means to the intake hole. And a gas supply passage for exhausting gas around the opening end of the fixing flange.