JPH071256A - Press-in device for long shaft - Google Patents

Abstract

PURPOSE:To sharply shorten an overall height and an overall length and to improve safety through lowering of a center of gravity. CONSTITUTION:The upper end of a stay 23 erected on a main base 22 is fixed to an auxiliary base 24. A pressure cylinder 26 is fixed to a main base 22 in a state that a ram 25 is pointed to the auxiliary base side, and a reaction force receiving member 28 is arranged to the stay 23 above the main base in a state to be movable along the stay. The upper end of the rod of an auxiliary cylinder 27 erected to the side of the pressure cylinder is connected to the reaction force receiving member and a lock groove 34 is formed in the stay. A locking mechanism 29 to bring the reaction force receiving member into an immobile state from the stay when the engaging member 35 is engaged with the lock groove is arranged to the reaction force receiving member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for a long shaft in which a bearing, a bush, a wafer ring, a polishing cloth for a nylon polishing roll, a fiber roll material for feeding a rolled steel plate, etc. are press-fitted into a long shaft-like object extending up to several meters. The present invention relates to a press-fitting device.

[0002]

2. Description of the Related Art In a conventional press-fitting apparatus shown in FIG. 6, an upper frame 3 is fixed between upper ends of columns 2 standing upright from a lower frame 1, and a pressure cylinder 4 is attached to the upper frame 3 so as to face downward. When the movable plate 6 is provided at the lower end of the ram 5 of the pressure cylinder 4 and the bearing 8 is press-fitted to the long shaft 7, as shown in the left half of FIG. 6, the flange 9 of the long shaft 7 is received. The bearing 8 is placed on the lower frame 1 in a state of being placed on the bearing 10, and the bearing 8 is fitted from the small diameter portion of the long shaft 7 so as to face the large diameter portion 11.
By lowering the ram 5, the lower end of the cylindrical press-fitting jig 12 is brought into contact with the bearing 8, and in this state, the bearing 8 is pressed into the large-diameter portion 11 by the pressure of the pressurizing cylinder 4. And
Since the press-fitting device having such a structure uses the long press-fitting jig 12, the height must be at least three times as high as that of the long shaft. Eg 4
The height of the press-fitting device for press-fitting the bearing on the long shaft of 12 meters is at least 12 meters, and actually the thickness of the lower frame 1 and the receiving piece 10 is about 16 meters. Also, FIG.
The conventional press-fitting device shown in FIG. 2 has two pressurizing cylinders 4a and 4b on the left and right, and a through hole 14 is opened in the center of the pressurizing plate 13.
The length of the press-fitting jig 12 'is shortened by penetrating the long shaft 7 into the through hole 14, and the height of the device is lower than that of the device shown in FIG. The total height is 12 meters.

[0003]

However, even with the press-fitting device shown in FIG. 7, the height that can be shortened is about 3.4 m at the maximum for the 4 m specification, and the entire device is still long and high. . Moreover, since a heavy pressure cylinder is provided at the upper end, the center of gravity is high, which is unstable and dangerous. Also, when the above-mentioned conventional press-fitting device is installed horizontally,
The factory space cannot be used effectively. Therefore, it has been desired to develop a safe and rational press-fitting device which can significantly reduce the total height or the total length.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above, and supports a column and a ram that are arranged in parallel with one end fixed to a main base and the other end fixed to an auxiliary base. A pressure cylinder fixed to the main base in a state of facing the base side, a reaction force receiving member movable along the column, a drive source for moving the reaction force receiving member along the column, and a reaction force receiving member. And a locking mechanism for immobilizing the member with respect to the column.

[0005]

When the reaction force receiving member is moved to the auxiliary base side, a large gap is provided between the ram attached to the reaction force receiving member and the ram, so that the long shaft can be set at a predetermined position. The drive source is actuated to move the reaction force receiving member to the main base side along the column, and stop at a predetermined position. Then, when the reaction force receiving member is locked to the column by the action of the locking mechanism, the reaction force receiving member becomes immovable with respect to the column. Therefore, the object to be press-fitted can be press-fitted into a predetermined portion of the long shaft by the pressing force of the pressurizing cylinder, and the reaction force at the time of press-fitting can be received by the reaction force receiving member.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. The press-fitting device 21 shown in FIG. 1 is installed as a vertical type, and four pillars 23 are vertically erected while the lower ends are fixed to the four corners of the main base 22 installed on the floor surface.
By mounting the auxiliary bases 24 on the upper ends of the columns 3, the columns 23 are fixed in a parallel state, and the rams 2 are attached to the main base 22.
5 is directed to the auxiliary base 24 side, and the pressure cylinder 26
Is fixed to the center, and the auxiliary cylinders 27, 27 are vertically fixed to the outside thereof, and the upper ends of the rods of the auxiliary cylinders 27 are connected to the reaction force receiving members 28 so that the reaction force receiving members 28 extend along the columns 23. The reaction force receiving member 28 is provided with a locking mechanism 29 that is movable and is immovable with respect to the columns 23.

As the pressurizing cylinder 26 in the present invention, a large diameter short stroke type hydraulic cylinder is used because a stroke required for press-fitting a press-fitted object such as a bearing into a long shaft is sufficient. In this embodiment, the pressure plate 30 is fixed to the tip of the ram 25, and the receiving piece 31 is placed on the pressure plate 30.

On the other hand, the auxiliary cylinder 27 includes the reaction force receiving member 2
Since the object to be press-fitted is not pressed only by moving 8 up and down, a hydraulic cylinder of a small diameter long stroke type is used in this embodiment.

The reaction force receiving member 28 is a sturdy metal plate having a through hole 32 in the center, guide holes 33 are formed at the four corners for the columns 23 to pass through, and the through hole 32 is formed on a smooth lower surface. A screw hole (not shown) for fastening the press-fitting jig is formed in the periphery, and the tip of the rod of the auxiliary cylinder 27 is connected to the lower surface near the guide hole 33. In addition, the pillar 23 is provided in the guide hole 33.
It is desirable to fit a metal or the like in order to reduce the friction with and the play.

Therefore, the reaction force receiving member 28 can be smoothly moved up and down along the columns 23 by the operation of the auxiliary cylinders 27, 27. Then, when it descends to the locking groove 34 formed on the outer peripheral surface of the column 23, the reaction force receiving member 28 is immovable with respect to the column 23 by the action of the locking mechanism 29 provided on the reaction force receiving member 28. be able to. The locking groove 34 is not limited to one location, and may be formed in a plurality of locations with different heights.

The locking mechanism 29 is engageable with and disengageable from the engaging groove 34 of the support column 23, and engages and disengages the engaging member 35 that prevents the reaction force receiving member 28 from moving in the engaged state. The driving force source for driving is provided, and the reaction force receiving member 28 is supported by the column 23 ...
Any configuration may be used as long as it can be locked in a stationary state. For example, the locking mechanism 29 shown in FIG. 2 has a semi-circular recess 3 near the upper opening edge of the guide hole 33.
6 has one end of a first engaging member 35a pivotally mounted on the reaction force receiving member 28 by a shaft 37 in a swingable manner, and the second engaging member 35b having a semicircular recess 36 has a shaft 3 in the middle thereof.
8, the two recesses 36, 36 are axially mounted so as to be swingable so as to be opposed to each other with the column 23 interposed therebetween, and are positioned on both sides of the guide hole 33, and the free end of the first engaging member 35a and the second engaging member 35a are engaged. The end of the member 35b is connected by a link piece 39, and a rod 40 'of a lock cylinder 40, which is a drive source, is connected in the middle of the first engagement member 35a. The first and second engaging members 35a, 35b are such that the recesses 36, 36 can be fitted into the locking grooves 34 of the support column 23, and the recesses 36, 3 are
The dimensions of the respective portions are set so that the outer portion of the recess 36 projects beyond the outer peripheral surface of the column 23 in a state in which 6 is engaged in the locking groove 34.

When the first engaging member 35a is pulled by driving the locking cylinder 40, that is, when the first engaging member 35a is swung clockwise around the shaft 37 in FIG. 2, the second engaging member 35b is moved through the link piece 39. It swings clockwise about the shaft 38, whereby the two recesses 36, 36 are separated from each other by a distance larger than the diameter of the column 23 and are in an open state. Therefore, in this open state, the first and second engaging members 35a and 35b are engaged with the engaging groove 34.
And the vertical movement of the reaction force receiving member 28 is allowed.

When the first locking member 35a is pressed toward the support column 23 by driving the locking cylinder 40, that is, when the first locking member 35a is swung counterclockwise about the shaft 37 in FIG. The engaging member 35b swings counterclockwise about the shaft 38, whereby both the concave portions 36, 36
Closes to a space narrower than the diameter of the column 23 to convert it into a closed state. In this closed state, the first and second engaging members 35a, 3
5b engages in the locking groove 34, and the outer portion of the recess 36 projects beyond the outer peripheral surface of the column 23. Therefore, when the reaction force receiving member 28 tries to rise due to the reaction force at the time of press fitting, the upper surface of the reaction force receiving member 28 (the upper surface in the vicinity of the upper opening edge of the guide hole 33) has the first and second engaging members 35a, It abuts on the lower surface of 35b, so that the reaction force receiving member 28 can be prevented from rising. Then, the reaction force acting on the reaction force receiving member 28 is received by the column 23 via the first and second engaging members 35a and 35b.

Thus, the first and second engaging members 35a, 3
5 b functions as a key or a cotter for the column 23, and locks the reaction force receiving member 28 with respect to the column 23. Then, the locking king cylinder 40 simply disengages the first and second engaging members 35a, 35b from the locking groove 34. Therefore, the locking cylinder 40 is sufficient if it can exert the driving force required for engaging and disengaging the engaging members 35a and 35b, and may be a small hydraulic cylinder.

Next, the operation of press-fitting the bearing 42 into the long shaft 41 will be described in detail. As shown in the left half of FIG. 1, a short cylindrical press-fitting jig 4 is provided on the lower surface of the reaction force receiving member 28.
3, the reaction force receiving member 28 is attached to the auxiliary cylinder 27,
It is raised by the operation of 27 and stopped. Next, the flange portion 44 through which the bearing 42 cannot pass is fixed with the long shaft 41 standing upright on the receiving piece 31, and the bearing 42 is fitted from the small diameter portion of the long shaft 41. Since the inner diameter of the bearing 42 and the outer diameter of the large diameter portion 45 are set to have a predetermined fit, the bearing 42 stops in a state where the lower opening edge is aligned with the shoulder of the large diameter portion 45.

In this state, the auxiliary cylinders 27, 27 are operated to lower the reaction force receiving member 28 and stop at the position where the lower end of the press-fitting jig 43 approaches the bearing 42. Then, the locking mechanism 29 locks the reaction force receiving member 28 with respect to the support columns 23, and the pressure cylinder 26 is operated in this locked state. The reaction force receiving member 28 can be lowered to a predetermined position without any trouble because the long shaft 41 passes through the central through hole 32 during the lowering.

When the pressurizing cylinder 26 is operated, the ram 25 gradually rises, and accordingly, the long shaft 41 also has a large diameter portion 4.
The bearing 42 is lifted in a state where the bearing 42 is locked to the shoulder of No. 5, so that the upper surface of the bearing 42 contacts the lower surface of the press-fitting jig 43. When the long shaft 41 receives the strong pressure of the pressurizing cylinder 26 and rises in this state, the bearing 42 is held by the press fitting jig 43, so that the large diameter portion 45 gradually enters into the hole of the bearing 42, When the long shaft 41 is further raised by the pressure of the pressurizing cylinder 26, as shown in the right half of FIG. 1, the large diameter portion 45 is sufficiently pressed into a predetermined position in the hole of the bearing 42.

When the press-fitting of the bearing 42 is completed in this way, the locking mechanism 29 is unlocked, the reaction force receiving member 28 is raised by the operation of the auxiliary cylinders 27, 27, and the long shaft 41 is taken out.

In the press-fitting device 21 described above, since the auxiliary cylinder 27 that moves the reaction force receiving member 28 has a small diameter,
Even if the discharge capacity of the pump is not large, the reaction force receiving member 28 can be moved quickly. Further, since the pressurizing cylinder 26 that applies the pressurizing force required for press-fitting has a short stroke and a large diameter, it is possible to generate a large pressurizing force even if the discharge capacity of the pump is not large. Therefore, work efficiency is high and productivity is high without using a pump having a large discharge capacity.

The total height of the press-fitting device 21 is such that the stroke of the pressurizing cylinder 26 is short and the press-fitting jig 43 is short.
Since it is possible to use the above, it is sufficient if there is a height obtained by adding the total length of the pressurizing cylinder 26 when extended, the length of the long shaft 41, the total length of the press-fitting jig 43, the thickness of the reaction force receiving member 28 and the like. Therefore, it can be suppressed to be much lower than the conventional press-fitting device. For example, the total height of the press-fitting device 21 that can be press-fitted into the 4-meter long shaft 41 is about 8 meters, about 1/2 of the conventional press-fitting device of FIG. 6 and about 2/3 of the improved type of FIG. 7.
It can be kept at the height of.

Although the press-fitting device 21 described above is a vertical type, it can be installed laterally and used as a horizontal type.

Further, the locking mechanism 29 is not limited to the above-mentioned embodiment, and for example, as shown in FIG. 3, semi-circular engagement members 35c and 35d are faced to each other so as to be movable back and forth, The engaging members 35c and 35d are separated from each other by a cylinder 40
It may be configured to open and close by connecting to c and 40d, or as shown in FIG. 4, the engaging members 35e and 35f are connected by pantograph-shaped link pieces 46 ...
The other engaging member 35f may be moved in the opposite direction by driving the cylinder 40e connected to the one engaging member 35e. Reference numeral 47 shown by a dotted line in FIG. 4 is a guide that regulates the moving direction of each member.

In another embodiment shown in FIG. 5, the support column 23 'is made of a bar material having a quadrangular cross section, and locking grooves 34' and 34 'are formed on opposite side surfaces of the support column 23'. Three
A cylinder 40 'is connected to a bifurcated engagement member 35' that can be engaged with the engagement member 35 'by moving the engagement member 35' back and forth by driving the cylinder 40 '. It may be configured to be engaged with and disengaged from the locking groove 34 '.

The drive source for moving the reaction force receiving member 28 along the column 23 is not limited to the hydraulic auxiliary cylinder 27, but may be an electric motor. For example, a pinion gear is fixed to the output shaft of the electric motor with reduction gear attached to the reaction force receiving member 28, the rack gear fixed along the column 23 is meshed with the pinion gear, and the reaction force receiving member 28 is rotated by the rotation of the pinion gear. May be configured to move along the column 23. Further, an electric motor with a speed reducer is attached to the auxiliary base 24, and a sprocket is fixed to the output shaft of the electric motor,
A chain hung on this sprocket may be connected to the reaction force receiving member 28.

[0025]

As described above, according to the present invention, the total height (total length) of the press-fitting device can be made much lower (shorter) than the conventional one. Therefore, when installing as a vertical type, it is not necessary to raise the roof of the factory, and when installing as a horizontal type, it contributes to effective use of the space of the factory. Also, when installing as a vertical type,
Since it can be installed with the heavy pressurizing cylinder facing down, the position of the center of gravity can be made lower than before, and it can be installed in a stable state and the safety during an earthquake can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a press-fitting device according to the present invention, in which the left half shows a state in which a reaction force receiving member is raised, and the right half shows a state in which a reaction force receiving member is lowered and locked.

FIG. 2 is a plan view of a locking mechanism.

FIG. 3 is a plan view of a second embodiment of the locking mechanism.

FIG. 4 is a plan view of a third embodiment of the locking mechanism.

FIG. 5 is a perspective view showing a fourth embodiment of the locking mechanism and another embodiment of the support column.

FIG. 6 is a front view of a conventional press-fitting device.

FIG. 7 is a front view of a conventional improved press-fitting device in which pressure cylinders are provided on the left and right.

[Explanation of symbols]

 21 Press-fitting device 22 Main base 23 Strut 24 Auxiliary base 25 Ram of pressure cylinder 26 Pressure cylinder 27 Auxiliary cylinder 28 Reaction force receiving member 29 Locking mechanism 34 Locking groove of strut 35 Locking mechanism engaging member 40 Locking cylinder 41 Long shaft 42 Bearing as press-fit object 43 Press-fitting jig 45 Large diameter part to press-fit the bearing

Claims (2)

[Claims] 1. A support column arranged in parallel with one end fixed to the main base and the other end fixed to the auxiliary base, and a pressure cylinder fixed to the main base with the ram facing the auxiliary base side. A reaction force receiving member movable along the column, a drive source for moving the reaction force receiving member along the column, and a locking mechanism for immobilizing the reaction force receiving member with respect to the column. Press-fitting device for long shafts. 2. A locking groove is formed on the outer peripheral surface of the column, and the locking mechanism is engageable with and disengageable from the locking groove of the column. When engaged, a part of the locking mechanism projects from the outer peripheral surface of the column to receive a reaction force. An engaging member for preventing the movement of the member, and a locking cylinder for engaging and disengaging the engaging member are provided.
The press-fitting device for a long shaft described in.