JPH08118167A - Automatic bolt fastening device - Google Patents

Abstract

PURPOSE: To smoothly feed a bolt to a threaded hole provided in a workpiece and positively fasten the bolt. CONSTITUTION: An automatic bolt fastening device is provided with a slide unit 20 longitudinally movable in relation to a workpiece W, and an elevating head 27 and a bolt drive unit 81 mounted on the slide unit 20. The elevating head 27 is provided with a guide cylinder 33. A bolt takeout port 62 is provided in a position communicable with the guide cylinder in the moved-up state of the elevating head 27, and a bolt transfer hose 65 is connected to the bolt takeout port 62. The bolt drive unit 81 is provided with a spindle 83 and a rotating drive mechanism 87. The slide unit 20 is advanced into a position close to the workpiece by an actuator 23. The bolt drive unit 81 is advanced by an actuator 84 while rotating the spindle 83.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt automatic tightening device for automatically supplying a bolt to a screw hole provided in a work and screwing the bolt in a process of assembling a work such as an engine-related part. Regarding

[0002]

2. Description of the Related Art Conventionally, various structures have been proposed as a device for automatically tightening bolts. For example, as in the bolt assembling device described in Japanese Patent Laid-Open No. 58-171227 (Prior Art 1), the bolts are held by magnets provided at the lower ends of a plurality of vertically extending sliding rods. It is known that the sliding rod is rotated by a spindle of a nut runner connected from above the sliding rod.

Alternatively, as in the bolt tightening device (Prior Art 2) shown in FIG. 13, the spindle 3 is inserted into the tubular portion 2 having the chuck portion 1 at the tip, and the spindle portion 3 joins the tubular portion 2 obliquely. It is known that the bolt supply pipe 4 is connected. The spindle 3 is rotated by a rotary drive mechanism 5 similar to a well-known nut runner, and an actuator (not shown) causes the spindle 3 to advance in the axial direction of the tubular portion 2.

In the case of the prior art 2, the bolt B is supplied from the bolt supply pipe 4 to the front of the spindle 3 by compressed air, and after the bolt B is held by the chuck portion 1, the bolt B is moved forward while rotating. Let By doing so, the head of the bolt B is fitted into the bolt fitting hole 6 provided at the tip of the spindle 3, and the spindle 3 is advanced toward the screw hole H of the work W to screw the bolt B. It is designed to be screwed into the hole H.

[0005]

The prior art 1 can be used for the work of simultaneously screwing a plurality of bolts from the upper surface side of the work, but is not suitable for the work of screwing the bolts in the horizontal direction. Further, when a large number of screw holes are provided in the work at a narrow pitch, it is impossible to tighten all the bolts at the same time.

Further, in the case of the prior art 2, when a large number of cylinder portions 2 and bolt supply pipes 4 are arranged at a pitch corresponding to each screw hole in a work in which a large number of screw holes are arranged at a narrow pitch. Since the cylindrical portions 2 and the bolt supply pipes 4 interfere with each other, it is impossible to simultaneously tighten the bolts in a large number of screw holes. Further, since the bolts violently collide with each other obliquely at the location where the tubular portion 2 and the bolt supply pipe 4 meet, the inner surface of the tubular portion 2 is heavily worn, and the worn parts must be frequently replaced.

Further, in the case of the prior art 2, if the length of the bolt to be transferred is short, the posture of the bolt may be disturbed at the confluence of the cylindrical portion 2 and the bolt supply pipe 4, and the bolt may be caught. Further, when the distance from the work W to the cylindrical portion 2 is large, it is necessary to make the spindle 3 project long from the tip of the cylindrical portion 2 toward the work W. Therefore, when the spindle 3 extends horizontally, the position of the bolt may not be determined due to the bending of the spindle 3 or the tip side of the spindle 3 causing a runout.

Therefore, an object of the present invention is to solve the above-mentioned problems, to smoothly transfer the bolts, to reduce the number of parts to be worn, and to simultaneously tighten a large number of bolts at a narrow pitch and also to tighten the bolts from the horizontal direction. It is to provide an automatic bolt tightening device that can be carried out without problems.

[0009]

SUMMARY OF THE INVENTION The present invention, which has been developed to achieve the above object, is an automatic bolt tightening device for screwing a bolt into a workpiece having a screw hole, the bolt tightening device being provided on a base and upward. An elevation head supported by a guide rod extending upward and downward and driven by an elevation actuator between an ascending position and a descending position, and a bolt for holding a bolt provided at the elevating head and capable of being opened and closed at its tip. A guide cylinder having a chuck portion and an opening on the base side and the chuck portion facing the screw hole of the workpiece when the lifting head is in the lowered position, and provided on the base body positioned behind the lifting head. It has a spindle that can be moved forward and backward with respect to the work and that can be inserted into the guide cylinder, and that rotates the spindle. A bolt drive unit having a rotation drive mechanism, and a bolt fitting portion provided at the tip of the spindle by inserting the spindle into the guide cylinder in a state where the elevating head is moved to the descending position. And a bolt drive unit moving means for pushing the bolt toward the screw hole of the work and a bolt removal opening at a position where the guide head can be communicated with the lifting head raised to a predetermined height. An outlet, a hose for transferring bolts having an opening on one end side connected to the back side of the bolt outlet, and a hose provided on the other end of the hose for supplying a bolt into the hose and squeezing the hose. And a bolt supply means for feeding air.

[0010]

When the elevating actuator moves the elevating head to the raised position, the guide tube provided on the elevating head communicates with the bolt outlet. Then, the bolt is supplied to the hose by the bolt supply means, and the bolt is pressure-fed toward the bolt outlet by the compressed air. This bolt enters the guide cylinder from the bolt outlet by compressed air and is held by the chuck portion at the tip of the guide cylinder. Then, the lifting head descends. When the elevating head is provided on the slide unit that can move forward and backward as described in claim 2, the tip of the guide cylinder (chuck portion) is screwed on the work by moving the slide unit forward. Close to the hole.

After that, when the bolt driving unit is moved forward by the bolt driving unit moving means, the spindle enters the inside of the guide cylinder and the bolt fitting portion at the tip of the spindle is fitted to the end portion of the bolt.
By pushing the spindle toward the screw hole of the work while being guided by the guide tube, the bolt is screwed into the screw hole as the spindle rotates. After tightening to the specified torque, the bolt drive unit retracts to its original position.

When a plurality of screw holes are provided at a predetermined pitch in the work as described in claim 4, the guide cylinder, the spindle and the bolt outlet are arranged at the same pitch as these screw holes. By arranging a plurality of screws, even if a large number of screw holes are lined up in a narrow range of the work, the bolts can be simultaneously supplied and tightened to the screw holes. In this case, since it is possible to simultaneously perform the bolt setting work in the bolt supply means while the bolts are tightened by the spindle, it is effective in shortening the cycle time required for tightening a large number of bolts. .

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The automatic bolt tightening device 10 shown in FIG. 1 is for tightening a bolt by screwing the bolt into a screw hole H of a work W which is carried on a conveyor 11 located on the left side of the drawing. This automatic bolt tightening device 1
0 includes a tightening device main body 12 provided at a position facing the side surface of the work W, and a bolt supply unit (bolt supply means) 13 located on the right side in the drawing.

An example of the work W is an engine part as shown in FIG. 12, and a large number of screw holes H are provided at predetermined positions of the work W for mounting a part P to be mounted such as a side cover on the work W. ing. The number of bolts B corresponding to the number of the screw holes H are simultaneously screwed into the screw holes H by the automatic tightening device 10 of the present embodiment. However, the automatic bolt tightening device 10 of this embodiment may be used to assemble machines other than the work W.

First, the tightening device body 12 will be described. The tightening device main body 12 includes a base 15 installed on a floor of a factory or the like. As shown enlarged in FIG.
First guide rail 1 extending horizontally on the base body 15
6 is provided. The first guide rail 16 is shown in FIG.
A pair is provided on the left and right when viewed from the front as shown in FIG.

A slide unit 20 is mounted on the first guide rail 16. The slide unit 20 includes a substantially horizontal base plate 21 so that the work W can be moved forward and backward from the side of the work W. That is, the slide unit 20 is driven in the front-rear direction by the first actuator 23 such as an air cylinder, and the first guide rail 1
6, it reciprocates from the retracted position shown in FIG. 2 to the advanced position shown in FIG.

The slide unit 20 is provided with a pair of left and right guide rods 25 standing upright on the base plate 21, and an elevating head 27 held by the guide rods 25 so as to be able to ascend and descend. As shown in FIG. 3, the guide rods 25 are connected to each other by a horizontally extending member 28 at the upper end portion. The lower end of each guide rod 25 is fixed to the base plate 21.

The elevating head 27 comprises an elevating base 30 extending in the vertical direction, bearing portions 31 and 32 provided on the elevating base 30, and a plurality of guide cylinders 33 fixed to the front side of the elevating base 30. ing. The bearing portions 31 and 32 are fitted to the guide rod 25 so as to be vertically movable.

A plurality of guide cylinders 33 are arranged at the positions corresponding to the pitches between the screw holes H of the work W, in the same number as the screw holes H. Each guide cylinder 33 is configured as shown in FIGS. 4 and 5. That is, the guide cylinder 33 includes a cylindrical cylindrical portion 35 that horizontally projects to the front surface side of the elevating base 30, and a bolt holding chuck portion 36 provided on the tip end side of the cylindrical portion 35. The base end side of the tubular portion 35 is fixed to the elevating base 30 and communicates with a through hole 37 provided in the elevating base 30. Tube 35
The inner diameter of the through hole 37 is of a size that allows the bolt B to be moved in the axial direction of the tubular portion 35 in a posture in which the bolt B is laid horizontally.

The chuck portion 36 is provided with a pair of chuck claws 40 that can be opened and closed. Each of the chuck claws 40 can be opened and closed about a support shaft 41, and is urged in a closing direction by a spring 42. And chuck claw 4
The bolt B is held inside the chuck claw 40 when 0 is closed.

Below the lift head 27, a lift actuator 45 such as an air cylinder for driving the lift head 27 is provided. The lift head 27 is moved by the actuator 45 from the lowered position shown in FIG.
It is adapted to be driven up and down over the ascending position shown in FIG.

The lifting actuator 45 of this embodiment
Is provided with a cylinder body 46 and a rod 47 protruding above the cylinder body 46, and the lifting head 27 can be pushed up by operating the rod 47 to the extension side.

Further, the upper end connecting portion 50 of the rod 47 can be fitted into the receiving portion 51 provided at the lower portion of the elevating base 30 only in the front-back direction (direction in which the slide unit 20 moves). Has become. Therefore, the upper end connecting portion 50 of the actuator 45 is separated from the receiving portion 51 of the elevating base 30 when the slide unit 20 moves forward, and when the slide unit 20 retracts to the original position, the upper end connecting portion 50 receives the receiving portion again. 51 can be fitted.

As shown in FIG. 2, a support wall 55 which stands upright is provided so as to overlap the back side of the elevating base 30 when the elevating head 27 is lowered.
The lower portion of the support wall 55 is fixed to the base plate 21. As shown in FIG. 5, the support wall 55 is provided with a cylindrical spindle insertion opening 56. Spindle insertion slot 5
6 are provided in the same number as the guide cylinders 33 at the same pitch as the guide cylinders 33.

As shown in FIG. 2, a plate 61 is vertically provided on an upper portion of a column 60 standing on the base plate 21. A plurality of bolt outlets 62 are arranged on the plate 61 at the same pitch as the guide cylinders 33 and the same number as the guide cylinders 33. Therefore, with the lifting head 27 raised to the rising end, each bolt outlet 62 and the guide tube 3
3 and 3 are in communication with each other in the horizontal direction (axial direction).
The inner diameter of the bolt take-out port 62 is of a size that allows the bolt B to pass through.

As shown in FIG. 4, the bolt outlet 62
The opening on the one end 65a side of the hose 65 for bolt pressure feeding is connected to the rear side of the. The other end 65b of the hose 65
(See FIG. 1) is connected to a bolt drop port 123 of a bolt distribution mechanism 112 described later.

A shielding plate 70 is provided on the upper front side of the pillar 60. As shown in FIG. 4 and FIG. 9, the shielding plate 70 faces the tip of the chuck portion 36 in a state where the elevating head 27 has moved to the rising end, and the tip of the chuck portion 36 and the shielding plate 70 are separated from each other. A small gap G is secured between them.

As shown in FIG. 3, the shield plate 70 is fixed by a bracket 71. This shield 70
When the slide unit 20 moves forward, the guide rod 25
Is divided into a plurality of parts 70a, 70b in order to allow it to pass forward, each part 70a, 7b
A gap 72 having a width that allows the guide rod 25 to pass therethrough is secured between 0b.

A work pressing mechanism 74 is provided at the front of the slide unit 20. This work pressing mechanism 74
Is provided with a work pressing element 76 protruding forward of the base plate 21 by a spring 75, and when the slide unit 20 advances to a predetermined position in the direction of the work W, the tip of the work pressing element 76 moves the work W to the conveyor 11 side. By pressing the workpiece W toward the positioning portion 77, the work W can be stopped at an accurate position in the width direction of the conveyor 11.

A second guide rail 80 is provided on the base plate 21. Similarly to the first guide rail 16, a pair of left and right second guide rails 80 extends in the horizontal direction. And the second guide rail 80
A bolt drive unit 81 is mounted on the above.

The bolt drive unit 81 includes the housing 8
2 and a plurality of spindles 83 protruding horizontally in front of the housing 82. These spindles 83 are arranged at the same pitch as the guide cylinder 33.
The same number is arranged. The housing 82 is horizontally driven along the second guide rail 80 by a second actuator 84 such as an air cylinder as an example of bolt driving unit moving means.

A rotary drive mechanism 87 having the same structure as a known nut runner is provided inside the housing 82.
The rotation drive mechanism 87 can rotate the spindle 83. Rotation drive mechanism 87
Is equipped with a torque detection switch 88, and the spindle 8
When the torque acting on No. 3 exceeds a predetermined value, the torque detection switch 88 is actuated to stop the rotation of the spindle 83.

The tip end side of each spindle 83 can be inserted into the guide cylinder 33 through the aforementioned spindle insertion port 56, and when the bolt drive unit 81 is advanced to the position shown in FIG. 11 by the second actuator 84, A socket portion 89, which is an example of a bolt fitting portion provided at the tip of the spindle 83, fits into the end portion of the bolt B, and the tip portion of the spindle 83 pushes open the chuck portion 36 and opens the screw hole H of the work W. It is possible to move forward to a position where

As shown in FIG. 6, the conveyor 11 is adapted to place the work W on the rollers 96 provided on the endless chain 95 via the pallet 97.
The work W is a positioning pin 98 provided on the pallet 97.
Is held in place by.

The chain 95 can be run endlessly in the direction of arrow F1 in FIG. 6 by a drive mechanism having a sprocket (not shown). The roller 96 is rotatably held by the chain 95. A pair of the chains 95 is provided in the width direction of the work W, and a stopper mechanism 100 for stopping the forward movement of the work W at a predetermined position is provided between the chains 95.

Although not limited to the illustrated example, the stopper mechanism 100 has, for example, a stopper claw 102 that reciprocally rotates about a shaft 101. This stopper claw 102
The actuator 104 such as an air cylinder can be driven in the arrow R1 direction in FIG. 6 via the intermediate link mechanism 103. The stopper mechanism 100 is rotated to rise and stand up when the work W is stopped, and is rotated and lowered by the actuator 104 to a position where the movement of the work W is not obstructed when the work W is passed.

Next, the bolt supply unit 13 will be described with reference to FIGS. 1 and 7 and 8. The bolt supply unit 13 is for feeding a bolt one by one from a container 110 in which a large number of bolts are randomly stored, and for holding a predetermined number of bolts received from the parts feeder 111 and then feeding them at once. Bolt distribution mechanism 112
It has. Two bolt distribution mechanisms 112 are provided in parallel, each of which is configured as shown in FIGS. 7 and 8, and one bolt distribution mechanism 112 can hold, for example, 10 bolts 10 each.

The bolt distribution mechanism 112 includes a base 117 fixed to a base frame 116 (shown in FIG. 1) and a base 117.
A rotary shaft 118 rotatable about a vertical axis with respect to 17
And a rotary disc 119 fixed to the upper end side of the rotary shaft 118.
And a shutter plate 1 provided so as to be reciprocally movable in the horizontal direction.
20 and the like. An air passage 121 is provided in the rotating shaft 118. A compressed air supply source (not shown) is connected to the air passage 121.

Further, a plurality of rotary discs 119 (1 in the illustrated example)
Bolt accommodating holes 122 at 0 places are provided at equal pitches in the circumferential direction. The base 117 has a bolt receiving hole 122.
Bolt drop openings 123 are provided at a predetermined pitch at positions corresponding to. Further, above the rotating disc 119, a bolt supply port 124 for supplying the bolts B sent from the parts feeder 111 one by one to the bolt accommodating holes 122.
Is provided.

The shutter plate 120 is horizontally reciprocally driven by an actuator 130 such as an air cylinder. When the shutter plate 120 is fully moved in the direction of arrow F2 in FIG. A through hole 131 is provided at a position corresponding to the accommodation hole 122. Therefore, when the shutter plate 120 moves forward to the above position, the through hole 131 communicates with the bolt receiving hole 122 and the bolt drop hole 123.

In addition, by the actuator 135, as shown in FIG.
A drive claw 136 that is reciprocally driven in the direction of the arrow F3 is provided, and the rotary disc 119 is driven by the drive claw 136.
Is intermittently rotated in the direction of arrow R2 by an amount corresponding to the pitch of the bolt housing holes 122.

Inside the bolt drop port 123, an air outlet 140 communicating with the above-mentioned air passage 121 is provided. Then, the hose 6 is inserted into the bolt drop hole 123.
The other end 65b of 5 is connected. Flexible hose 6
5 has an inner diameter that allows the bolt B to be transferred in a posture along the axis of the hose 65. This hose 65
Are arranged generally horizontally.

Next, the automatic bolt tightening device 10 having the above-mentioned structure.
The operation of will be described. The work W rides on the conveyor 11 and is conveyed to a position facing the tightening device body 12. At that time, since the claw 102 of the stopper mechanism 100 is raised, the work W is stopped at a predetermined position by the claw 102. The attachment target component P is conveyed to the work W in a state of being temporarily attached by an appropriate temporary fixing means.

The elevating actuator 45 moves the elevating head 27 to the raised position shown in FIG. 9, and the guide cylinder 33 provided on the elevating head 27 is brought into communication with the bolt outlet 62.

In the bolt supply section 13, the rotating disc 119 rotates intermittently so that the bolts B are inserted into the bolt receiving holes 122 of the rotating disc 119 one by one.
Thus, the predetermined number of bolts B are placed on the shutter plate 120.

After that, the shutter plate 120 advances in the direction of arrow F2 in FIG.
It passes through 31 and the bolt drop port 123 and falls inside the hose 65. Further, the compressed air supplied from the air outlet 140 causes the bolt B to reach the bolt outlet 62 through the hose 65, is further pressure-fed into the guide cylinder 33, and stops at the chuck portion 36. At this time, the amount by which the bolt B projects from the tip of the chuck portion 36 is adjusted to the shielding plate 70.
It is possible to regulate by the gap G between the and. In this way, the predetermined number of bolts B are held by the chuck portions 36 of the respective guide cylinders 33.

After the elevating head 27 descends, the slide unit 20 is advanced by the first actuator 23, as shown in FIG. By doing so, the chuck portion 36 of the guide cylinder 33 approaches the screw hole H of the work W.

After that, as shown in FIG. 11, the second actuator 84 moves forward and the rotary drive mechanism 8 moves.
When the spindle 83 is rotated by 7, the spindle 83 further advances with the socket 89 at the tip of the spindle 83 fitted to the end of the bolt B. As a result, as the bolt B rotates, the tip of the spindle 83 is pushed toward the screw hole H while pushing the chuck portion 36 open, so that the bolt B is screwed into the screw hole H.

In this way, when the bolt B is screwed in until it reaches a predetermined tightening torque, the torque detection switch 88 of the rotary drive mechanism 87 is actuated to stop the rotation of the spindle 83.

After that, the slide unit 20 retracts to the original position (the state of FIG. 2), and the claws 102 of the stopper mechanism 100 descend, so that the work W is sent to the next process and one cycle is completed. . after that,
A new work is again carried and the above-mentioned bolt tightening process is repeated.

According to the apparatus 10 of the above embodiment, the guide tube 3
Since it is possible to arrange a large number of 3 at a fairly narrow pitch, all bolts can be tightened at the same time even in a work having a large number of screw holes in a small area.

In addition, while the bolt B is being tightened by the spindle 83,
A predetermined number of bolts B are inserted into the bolt receiving holes 1 of the rotary disc 119.
It is possible to supply the voltage to the battery 22, and it is possible to eliminate the waiting time for supplying the bolt B, and it is possible to shorten the cycle time.

According to the apparatus 10 described above, the guide cylinder 33 is brought closer to the work W by the first actuator 23, and the spindle 83 is guided in the axial direction by the guide cylinder 33 while the screw hole H of the work W is being guided. Since the tip end of the spindle 83 near the socket 89 is rotatably supported, the tip end side of the spindle 83 bends due to gravity or has a runout even if the spindle 83 extends long in the horizontal direction. The guide cylinder 33 can prevent problems such as the occurrence of the trouble.

Further, since the work unit pressing mechanism 74 is provided in the slide unit 20, the slide unit 20
When is moved forward, the position of the work W (the position in the width direction of the conveyor 11) can be correctly regulated by the work pressing member 76 and the positioning portion 77. Moreover, the position of the work W can be regulated by the stopper mechanism 100 in the forward direction of the work W, and the work W can be accurately held at a predetermined position when the bolt B is automatically tightened.

Moreover, in the apparatus 10 of this embodiment, there is a portion where the bolt transfer path suddenly changes as in the prior art 2 (FIG. 13) (a portion where the bolt collides violently with compressed air from an oblique side). In addition, since the hose 65 for transferring bolts can be arranged substantially horizontally, the bolts can be transferred smoothly and wear is reduced. If the existing device has a forward / backward driving bolt drive unit device configured to automatically perform only bolt tightening work, the bolt supply device of the present embodiment should be added to the existing device. Is also possible.

[0056]

As described above, according to the present invention, the bolt can be transferred smoothly, and it is possible to prevent the spindle from sagging and bending even if a long spindle extending horizontally is used. , The bolt can be accurately guided to the screw hole. Further, each bolt can be tightened at the same time even for a work having a large number of screw holes in a narrow range. It is also possible to install a hose for feeding bolts in a generally horizontal position without any problem.

[Brief description of drawings]

FIG. 1 is a side view of an automatic bolt tightening device according to an embodiment of the present invention.

2 is an enlarged side view showing a part of the apparatus shown in FIG. 1. FIG.

FIG. 3 is a front view of a portion of the apparatus shown in FIG.

4 is a vertical cross-sectional view showing a part of a guide tube and a hose of the apparatus shown in FIG.

5 is a cross-sectional view showing a part of a guide cylinder and a spindle of the apparatus shown in FIG.

6 is a front view of the conveyor and stopper mechanism used in the apparatus shown in FIG.

FIG. 7 is a plan view of a bolt distribution mechanism used in the device shown in FIG.

8 is a cross-sectional view taken along the line aa in FIG.

9 is a side view of the apparatus shown in FIG. 1 in a state in which a lifting head is raised.

FIG. 10 is a side view of the device shown in FIG. 1 in a state where the slide unit is advanced.

FIG. 11 is a side view of the device shown in FIG. 1 with the bolt drive unit advanced.

FIG. 12 is a perspective view showing an example of a work.

FIG. 13 is a sectional view showing a part of a conventional automatic bolt tightening device.

[Explanation of symbols]

10 ... Automatic bolt tightening device 11 ... Conveyor 13 ... Bolt supply unit 15 ... Substrate 20 ... Slide unit 23 ... Actuator 25 ... Guide rod 27 ... Elevating head 33 ... Guide tube 36 ... Chuck part 45 ... Elevating actuator 62 ... Bolt removal Outlet 65 ... Hose 70 ... Shielding plate 74 ... Work pressing mechanism 77 ... Positioning part 81 ... Bolt drive unit 83 ... Spindle 84 ... Actuator (bolt drive unit moving means) 87 ... Rotation drive mechanism 89 ... Socket part (bolt fitting part) 100 ... Stopper mechanism 112 ... Bolt distribution mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoji Shimada 3-5-55 Nishiiwata, Higashi-Osaka City, Osaka Prefecture Yokota Industry Co., Ltd.

Claims (5)

[Claims] 1. An automatic bolt tightening device for screwing a bolt into a workpiece having a screw hole, the vertically moving actuator being supported by a guide rod provided on a base body and extending upward, and a lifting actuator. Has an elevating head that is driven by an elevating position and a descending position by an elevating position, and has a chuck portion for holding a bolt that is provided on the elevating head and that can be opened and closed and has a base side opening and the elevating head has the lower position. And a guide cylinder in which the chuck portion faces the screw hole of the work when the work piece is in the A bolt drive unit having a rotatable spindle and a rotary drive mechanism for rotating the spindle; By inserting the spindle into the guide tube while the descending head has moved to the descending position, the bolt fitting portion provided at the tip of the spindle is fitted to the end portion of the bolt, and the bolt is attached to the work piece. A bolt drive unit moving means for pushing out toward the screw hole, a bolt outlet opening at a position where it can communicate with the guide cylinder when the elevating head is raised to a predetermined height, and one end on the back side of the bolt outlet. A hose for transferring a bolt to which a side opening is connected; and a bolt supply means provided on the other end side of the hose for supplying a bolt into the hose and sending compressed air to the hose. Automatic bolt tightening device characterized by. 2. The elevating head is provided in a slide unit that is movable forward and backward with respect to the work stopped at a predetermined position and is moved to a predetermined forward position by an actuator. The bolt automatic tightening device according to claim 1. 3. A stopper mechanism for stopping the advance of the work when the work reaches a predetermined position is provided on the conveyer side for conveying the work, and the slide unit is provided with the stopper mechanism in the state of advancing toward the work. 3. The automatic bolt tightening device according to claim 2, further comprising a work pressing mechanism that presses the work toward a positioning portion provided on the back surface side of the work by coming into contact with the work. 4. The work is provided with a plurality of screw holes at a predetermined pitch, and the guide cylinder, the spindle, and the bolt outlet are arranged in a plurality at the same pitch as these screw holes. The automatic bolt tightening device according to claim 1, wherein: 5. A shield plate is provided in front of the bolt outlet and faces the tip of the chuck portion at a predetermined interval in a state where the lifting head is raised to a predetermined height. Item 1. The automatic bolt tightening device according to Item 1.