JP2001212725A - Bolt fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bolt fastening device for surely fastening a side wall body such as a rod guide in a hydraulic cylinder to a cylindrical body end part. SOLUTION: The bolt fastening device is provided with a bolt fastening mechanism 10 fastening a bolt 4, a clamp mechanism 7 gripping and fixing a boss 5 fixed to the other end of the cylindrical body 2, a turning mechanism 8 turning the cylindrical body 2 fixed by means of the clamp mechanism 7 with the clamp mechanism 7, a brake mechanism 9 stopping the rotation of the turning mechanism 8 in the predetermined position and fixing it there, and a control device 26 controlling these mechanisms so that the bolt is sequentially fastened up while the cylindrical body is turned and stopped by a predetermined angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt fastening device for fastening a side wall body to a side wall of a cylindrical body by bolts, and more particularly, to a rod guide body fastened to an end of a hydraulic cylinder by bolts. The present invention relates to a bolt fastening device suitable for performing the above.

[0002]

2. Description of the Related Art In a hydraulic cylinder, a structure in which a rod guide body is fastened to a piston rod side end by a plurality of bolts is generally employed as described in, for example, Japanese Patent Application Laid-Open No. 9-151909. Have been.

[0003] The assembly of the rod guide body in the above-described hydraulic cylinder is performed while the cylindrical cylinder body is held by a clamp device.

[0004]

In the work of assembling the rod guide body to the hydraulic cylinder described above, in order to maintain the airtightness at the time of fastening, a large force may be applied to the bolt to retighten it. At this time, a rotational force acts on the hydraulic cylinder due to the bolt tightening force. If the rotational force is greater than the clamp force of the clamp device, the hydraulic cylinder rotates, and there is a problem that a predetermined tightening force cannot be applied to the bolt.

The present invention has been made based on the above-mentioned matters, and provides a bolt tightening device capable of securely tightening a side wall body such as a rod guide of a hydraulic cylinder to an end of a cylindrical body. Aim.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a bolt fastening device for fastening a side wall to an end of a cylindrical body with a bolt. A bolt tightening mechanism for tightening, a clamp mechanism for grasping and fixing a boss fixed to the other end of the cylindrical body, a rotating mechanism for rotating the cylindrical body fixed by the clamp mechanism together with the clamp mechanism, and a rotating mechanism. A brake mechanism for stopping and fixing rotation at a predetermined position, and a control device for controlling these mechanisms so as to sequentially tighten bolts while rotating and stopping the cylinder by a preset angle. .

According to the first aspect of the present invention, the cylinder can be securely fixed so that the cylinder does not rotate when the bolt is tightened, and the cylinder is rotated and stopped after the bolt is tightened. By tightening the following bolts,
A plurality of bolts can be automatically tightened with a predetermined torque, so that significant rationalization can be achieved.

According to a second aspect of the present invention, in the first aspect of the present invention, the control device controls so that a plurality of preset angles can be arbitrarily set and a plurality of bolts are sequentially tightened in an arbitrary sequence pattern. It is characterized by the following.

According to the second aspect of the invention, adjacent bolts can be sequentially tightened, diagonal bolts can be sequentially tightened, or an arbitrary sequence pattern can be used, so that an optimum tightening state can be realized.

Further, according to a third aspect of the present invention, in the first or second aspect of the present invention, an intermediate clamp is provided between the clamp mechanism and the bolt tightening mechanism to support the cylindrical body at an intermediate position. And the bolt tightening mechanism are slidably installed independently in the axial direction of the cylindrical body.

According to the third aspect of the present invention, since the intermediate clamp is provided, the cylindrical body can be more securely fixed, and the intermediate clamp and the bolt tightening mechanism can be slid so that the cylinders having different lengths can be slid. Can respond to the body.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 shows an embodiment of the apparatus according to the present invention, in which one part is shown in a sectional view. In FIG.
1 is a hydraulic cylinder to be worked by the present invention, 2 is a cylinder body of the hydraulic cylinder 1, 3 is a rod guide body fastened to an end of the cylinder body 2, and 4 is a rod guide body 3 which is an end of the cylinder body 2. And a plurality of bolts to be fastened at equal intervals on the circumference. In this embodiment, a hexagon socket head bolt is used as the bolt. 5 is a cylinder 2
Is a boss fixed to the other end.

6 is a stand on which each mechanism according to the present invention is installed;
7 is a clamp mechanism for holding and fixing the boss 5, 8 is a gantry 6
Cylinder body 2 installed on top and fixed by clamp mechanism 7
Is a rotation mechanism for rotating the rotation mechanism 8 together with the clamp mechanism 7, a brake mechanism 9 for stopping and fixing the rotation of the rotation mechanism 8 at a predetermined position, and a predetermined mechanism 10 is provided on the gantry 6 to fix the bolt 4 at the end of the cylinder body 2 to a predetermined position. It is a bolt tightening mechanism that tightens up to the torque.

Reference numeral 11 denotes a clamp mechanism 7 and a bolt tightening mechanism 1.
This is an intermediate clamp that is installed on the base 6 between 0 and supports the cylinder body 2 in the middle, can support cylinder bodies with different diameters, and can rotatably support the cylinder body 2 or fix it non-rotatably. It has become. 12 and 13 are installed on the gantry 6, and the bolt tightening mechanism 10 and the intermediate clamp 1
1 are rails for movement, each of which can move in the axial direction of the cylinder body.

FIG. 2 shows the clamp mechanism 7, the rotation mechanism 8 and the brake mechanism 9 according to an embodiment of the apparatus of the present invention.
It is a figure which shows typically. In FIG. 2, the same reference numerals as those shown in FIG. 1 denote the same parts.

Reference numeral 14 denotes a fixed frame mounted on the rotating shaft of the rotating mechanism 8, and 15 denotes a fixed
The motor 16 is provided on the fixed frame 14 and is rotated by the motor 15. The right and left sides of the motor 16 are cut at the center. Reference numeral 17 denotes a clamp composed of a pair of left and right parts. Each of the right and left parts has a female thread portion processed in accordance with the left and right screws of the screw 16, and the left and right screws of the screw 16 are respectively attached to these female threads. It is penetrated. The fixed frame 14, the motor 15, the screw 16 and the clamp 17 constitute a clamp mechanism 7.

Reference numeral 18 denotes a motor for rotating the clamp mechanism 7, which constitutes the rotation mechanism 8, and the fixed frame 14 of the clamp mechanism 7 is mounted on the rotation shaft. Motor 18
Has a built-in speed reducer to reduce rotation and a clutch function for manual rotation if necessary.

Reference numeral 19 denotes a disk brake provided on a rotation shaft between the clamp mechanism 7 and the rotation mechanism 8 to suppress and fix the rotation of the clamp mechanism 7, and constitutes a brake mechanism 9 together with an electric brake described later. . The disc brake 19 mainly has a role of fixing the rotating shaft and the clamp mechanism 7 after the rotation stops.

FIG. 3 is a diagram schematically showing the bolt tightening mechanism 10 according to an embodiment of the apparatus of the present invention. In FIG. 3, the same reference numerals as those shown in FIG. 1 denote the same parts.

Reference numeral 20 denotes a torque wrench for tightening the bolt 4 with a specified torque. In this embodiment, a pneumatic torque wrench is used. In a pneumatic torque wrench, when a bolt is tightened to reach a set torque, air is relieved and rotation of the torque wrench stops. This torque wrench 20
The tip of the torque wrench 20 is shaved in order to smoothly insert the tip of the bolt 4 into the hexagonal hole of the bolt 4, and the torque wrench has a slight play.

Reference numeral 21 denotes a cylinder for moving the torque wrench 20 in the axial direction of the cylinder body 2;
As a result, the torque wrench 20 moves in the bolt direction when tightening the bolt, and moves in the opposite direction after the tightening is completed. Reference numeral 22 denotes a cylinder for moving the torque wrench 20 in the vertical direction.
This is to cope with the difference in the tightening position.

FIG. 4 is a block diagram for controlling the rotation mechanism 8 and the brake mechanism 9 according to an embodiment of the apparatus of the present invention. In FIG. 4, the same reference numerals as those shown in FIGS. 1 and 2 denote the same parts.

Reference numeral 23 denotes an encoder for detecting the rotation angle of the rotation mechanism 8, that is, the rotation angle of the clamp mechanism 7, and outputting a pulse signal. Reference numeral 24 counts the pulse signal output from the encoder 23 and becomes equal to a preset value. This is a counter that outputs a coincidence signal when an error occurs.

Reference numeral 25 denotes an electric brake for stopping the motor 18 by applying a reverse brake, and constitutes the brake mechanism 9 together with the disc brake 19. Electric brake 25
Plays a role mainly to stop the rotating motor 18, and the disc brake 19 plays a role mainly to fix the rotating shaft and the clamp mechanism 7 after the rotation is stopped.

Reference numeral 26 denotes a control device constituted by a sequence controller or the like, which controls the automatic operation according to the present embodiment. In the block diagram of FIG. 4, the control device 26 instructs the brake mechanism 9 to release the brake according to the information on the completion of the tightening operation from the torque wrench 20 and the cylinder 21 and calculates from the separately provided bolt interval and tightening sequence. The set value is output to the counter 24, and the motor 18 is commanded to rotate. When the coincidence signal is output from the counter 24, a stop command is issued to the motor 18 and the brake mechanism 9 is instructed to stop and fix the rotation. Although not shown in this block diagram, the control device 26 also sets the tightening torque of the torque wrench 20 shown in FIG. 3, controls the rotation and stop, controls the expansion and contraction of the cylinder 21, and controls the support state of the intermediate clamp 11. Is going.

Next, the operation of the above-described embodiment of the present invention will be described.

In the operation of tightening the bolt 4 to fasten the rod guide body 3 to the end of the cylindrical cylinder body 2 shown in FIG. 1, a boss 5 is fixed to the other end of the cylinder body 2 in advance by welding or the like. The rod guide body 3 is attached to the end of the cylinder body 2 and the bolts 4 are temporarily tightened. The cylinder body 2 in such a state is set in the apparatus of the present invention.

First, the boss 5 is gripped by the clamp mechanism 7, and the intermediate portion of the cylinder body 2 near the rod guide body 3 is supported by the intermediate clamp 11. If the cylinder body 2 having a different length is set, the intermediate clamp 11 is moved to an appropriate position on the moving rail 13, and the bolt tightening mechanism 10 is moved to an appropriate position on the moving rail 12. I do.

Next, the brake mechanism 9 is released to make the clamp mechanism 7 rotatable, and the intermediate clamp 11 is set in a state where the cylinder body 2 is rotatable, and the cylinder body 2 is rotated to a position where the first bolt is tightened. Position. This positioning may be performed manually, or may be performed automatically by detecting the position of the bolt 4 with a sensor.

When the positioning is completed, the brake mechanism 9 is actuated to fix the clamp mechanism 7, and the intermediate clamp 11 is set so that the cylinder body 2 cannot be rotated, thereby fixing the cylinder body 2.

Here, the operation of the clamp mechanism 7 will be described in detail with reference to FIG. When the motor 15 rotates, the screw 16
Rotates, and the clamp 17 moves according to this rotation. However, since the screw 16 is threaded in the left and right opposite directions with the center part as a boundary, the left and right parts of the clamp 17 move in the opposite directions. In this way, the clamp 17 opens and closes to grip the boss 5.

Next, the positioning of the cylinder 2 and the tightening of the bolts will be described with reference to FIG.

In positioning the cylinder 2, the cylinder 2 is rotated so that the center axis of the torque wrench 20 and the center axis of the bolt 4 coincide. At this time, in the case of cylinder bodies having the same diameter, positioning can be performed only by rotation of the cylinder body 2. However, when the diameter of the cylinder body is different, the center axis of the torque wrench 20 and the center axis of the bolt 4 are aligned by moving the cylinder 22 up and down.
The vertical movement of the cylinder 22 can be automatically performed by setting a necessary movement amount in advance according to the diameter of the cylinder body.

When the positioning is completed, the cylinder body 2 is fixed as described above, and the operation proceeds to bolt tightening work. First, the cylinder 21 is extended and the torque wrench 20 is connected to the cylinder body 2.
Side, and insert the tip of the torque wrench 20 into the hexagonal hole of the bolt 4. At this time, the tip of the torque wrench 20 is shaved to give a slight backlash and is free in the rotating direction.
Is easily inserted into the hexagonal hole of the bolt 4.

The cylinder 2 is moved to a specified position by a position sensor or the like.
When it is detected that 1 has expanded, the torque wrench 20 rotates and tightens the bolt 4. When the tightening torque reaches the set torque, the air is relieved and the rotation of the torque wrench 20 stops. When this state is detected or after a predetermined time has elapsed, the torque wrench 20 is stopped, the cylinder 21 is contracted to release the torque wrench 20 from the bolt 4, and the cylinder 21 is retracted to a position where it does not come into contact even if the cylinder body 2 rotates. Thus, the tightening of one bolt 4 is completed.

Next, the cylinder body 2 is rotated to tighten the next bolt 4. This operation will be described with reference to FIG.

Upon receiving the information indicating the end of the tightening operation, the control device 26 outputs to the counter 24 a set value corresponding to the rotation angle up to the next rotation position. This rotation angle is calculated and output from a predetermined bolt interval and bolt tightening order. As the bolt tightening sequence, for example, an adjacent bolt may be sequentially tightened, a bolt on a diagonal line opposite to the center of the cylinder body may be tightened, or an arbitrary pattern can be set.

Next, the controller 26 instructs the brake mechanism 9, that is, the disc brake 19 and the electric brake 25, to release the brake, and instructs the intermediate clamp 11 to a state in which the cylinder body 2 is rotatably supported. After making the cylinder body 2 rotatable in this manner, the rotation mechanism 8
That is, the motor 18 is commanded to rotate.

When the rotation mechanism 8 rotates, the clamp mechanism 7 rotates, and the cylinder body 2 rotates. This rotation angle is detected by the encoder 23, and a pulse signal is output to the counter 24 and counted. When the rotation mechanism 8 rotates by a preset angle, the count value becomes equal to the set value set by the control device 26, and the counter 24 outputs a coincidence signal to the control device 26.

When the controller 26 receives the coincidence signal, the controller 26 issues a stop command to the rotating mechanism 8, that is, the motor 18. However, since the rotating mechanism rotates by inertia alone, the controller 26 instructs the brake mechanism 9 to stop and fix the rotation. I do. In the brake mechanism 9, first, the electric brake 25 is actuated to activate the motor 18.
The brake is stopped by applying reverse braking, so that it can be stopped smoothly without any shock. Thereafter, the disc brake 19 is operated, so that the rotating shaft of the rotating mechanism 8 and the clamp mechanism 7 can be firmly fixed. After that, a command is issued to the intermediate clamp 11 to fix it so that it cannot rotate, and the positioning is completed.

Thereafter, the bolt tightening operation and the positioning operation are repeated, and when all the predetermined bolts have been tightened, the automatic tightening operation is completed. Therefore, the clamp mechanism 7 and the intermediate clamp 11 are released, and the cylinder body 2 is removed. A series of work is completed by removing from this device.

Although the embodiment of the device of the present invention has been described by fastening the rod guide to the cylinder body of the hydraulic cylinder, the present invention can be applied to an apparatus in which the side wall body is fastened to the end of the cylinder body by bolts.

[0044]

As described above, according to the present invention, it is possible to securely fix the cylinder so that the cylinder does not rotate when tightening the bolt, and to rotate the cylinder after tightening the bolt. -By stopping and tightening the next bolt, a plurality of bolts can be automatically tightened with a predetermined torque, and significant rationalization can be achieved.

[Brief description of the drawings]

FIG. 1 shows one embodiment of the device of the present invention;
It is a front view which shows a part by sectional drawing.

FIG. 2 is a front view schematically showing a clamp mechanism, a rotation mechanism, and a brake mechanism according to an embodiment of the device of the present invention.

FIG. 3 is a front view schematically showing a bolt tightening mechanism according to an embodiment of the device of the present invention.

FIG. 4 is a block diagram for controlling a rotation mechanism and a brake mechanism according to an embodiment of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic cylinder 2 Cylinder body 3 Rod guide body 4 Bolt 5 Boss 7 Clamp mechanism 8 Rotation mechanism 9 Brake mechanism 10 Bolt tightening mechanism 11 Intermediate clamp 12 Moving rail 13 Moving rail 26 Control device

Claims (3)

[Claims] 1. A bolt tightening device for fastening a side wall to an end of a cylindrical body by a bolt, wherein a bolt tightening mechanism for tightening the bolt and a boss fixed to another end of the cylindrical body are gripped. And a clamp mechanism for rotating the cylindrical body fixed by the clamp mechanism together with the clamp mechanism, a brake mechanism for stopping and fixing the rotation of the rotary mechanism at a predetermined position, and setting these mechanisms in advance. A control device for controlling the bolts to be sequentially tightened while rotating and stopping the cylindrical body by a predetermined angle. 2. The bolt according to claim 1, wherein the control device is capable of arbitrarily setting a plurality of the preset angles and controlling the plurality of bolts to be sequentially tightened in an arbitrary sequence pattern. Tightening device. 3. An intermediate clamp for supporting the cylindrical body at an intermediate position between the clamp mechanism and the bolt tightening mechanism, wherein the intermediate clamp and the bolt tightening mechanism are respectively provided in the axial direction of the cylindrical body. The bolt tightening device according to claim 1, wherein the bolt tightening device is installed so as to be independently slidable.