JP2826064B2 - Tightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for tightening or loosening a screw member used for fastening a mold for forming a secondary concrete product.

[0002]

2. Description of the Related Art As a mold for centrifugal force forming of a secondary concrete product, for example, as described in JP-B-59-49169, each of them has a semicircular cross-sectional shape and has opposite side portions. A pair of half bodies each having a flange are used. The two halves are fastened at each of a plurality of opposing flanges by screw members such as bolts and nuts.

[0003] One of the so-called tightening and loosening devices used for fastening or releasing a mold of this type, that is, for fastening or releasing a screw member, is described in the above-mentioned publication. This known tightening / closing device moves a plurality of tightening / loosening mechanisms, that is, processing mechanisms together with the mold while continuously moving a mold in which a screw member is arranged in one direction, and in the meantime, using a wrench of each processing mechanism. The screw member is rotated. The processing mechanism is advanced one after another with the movement of the formwork, after tightening or after its release,
It is returned to the initial position. In the present invention, the moving direction of the form is referred to as the front-back direction, and the horizontal direction crossing the moving path of the form substantially at right angles is referred to as the left-right direction.

Each wrench is moved by the moving mechanism toward and engaged with the screw member of the mold while the corresponding processing mechanism is moved together with the mold, and then tightens or releases the screw member. Then, it is moved in a direction away from the screw member by the moving mechanism, and the engagement with the screw member is released.

[0005] However, in the known tightening device, the tightening or releasing of the screw member is repeated only. Therefore, the tightening or releasing of the screw member is not performed properly due to rust of the screw member. was there. If the screw member is not properly tightened or released,
After the processing by the fastening device, it is necessary to manually inspect whether or not the screw member has been properly tightened or released. Therefore, the working efficiency is reduced despite the mechanical processing.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to easily confirm whether or not a screw member has been properly tightened or released.

[0007]

A tightening and loosening device according to the present invention comprises a plurality of wrenches for tightening or loosening a screw member, the plurality of wrenches being moved from a first position to a second position forward thereof. A notification device that detects and reports an error in tightening or loosening the screw member by the wrench.

The notifying device used in the present invention includes a plurality of rotation sensors individually corresponding to the wrench, the plurality of rotation sensors detecting rotation of the corresponding wrench and outputting a detection signal, Based on the detection signal of the sensor, it is determined for each wrench whether or not the screw member has been properly tightened or loosened. If the screw member has not been properly tightened, an abnormal signal indicating that fact is provided for each wrench. Signal processing means for outputting, and notifying means for notifying, for each wrench, that the screw member has not been properly tightened or loosened based on the abnormal signal from the signal processing means.

When the wrench is rotated, the screw member is properly tightened or loosened, and a corresponding rotation sensor outputs a detection signal. Therefore, when the screw member is tightened or loosened normally, the signal processing means does not output an abnormal signal of the wrench.

However, if the wrench is not correctly rotated,
Since the corresponding rotation sensor does not output a detection signal, an abnormal signal of the wrench is output from the signal processing means, and the fact that the tightening or loosening of the screw member was not normally performed is indicated by an indicator light, a buzzer, etc. for each wrench. Notify. This allows the operator to know for each wrench that the tightening or loosening of the screw member has not been performed normally.

According to the present invention, a rotation sensor for detecting that the wrench has been rotated is provided for each wrench, and based on a detection signal from the rotation sensor, whether or not the screw member has been properly tightened or loosened is determined. Was determined for each wrench, it was possible to easily confirm for each wrench that the screw member was not properly tightened or loosened,
Processing capacity is improved.

Preferably, the signal processing means determines whether or not the screw member has been properly tightened or loosened based on whether or not the wrench has been rotated for a predetermined time or a predetermined number of times. With this configuration, when the wrench stops in the middle of the tightening or loosening of the screw member, an abnormal signal is output, so that it is possible to accurately determine whether the tightening or loosening of the screw member has been performed normally. .

[0013] The wrench includes a rotating body releasably engaged with the screw member, and a rotation source for rotating the rotating body. The notification device further includes a load acting on the rotation source reaching a predetermined value. A load sensor for detecting that the wrench has been turned on, and outputting a detection signal, wherein the signal processing means tightens or loosens the screw member based on the detection signal of the load sensor after the wrench has been rotated for the predetermined time or the predetermined number of times. It is preferable to output a normal signal indicating that the operation has been performed normally. With this configuration, in particular, when the screw member is tightened in a predetermined state, the load acting on the rotation source reaches a predetermined value, and therefore, when the wrench is idled without the screw member being tightened in the predetermined state. In addition, it is possible to prevent erroneous detection that the screw member is tightened in a predetermined state.

After the wrench has been rotated for the predetermined time or the predetermined number of times, the wrench is further rotated for an additional predetermined time or the predetermined number of times, so that the screw member is normally tightened or loosened. It is preferable to output a normal signal indicating that the operation has been completed. With this configuration, when the wrench is rotated for an additional predetermined time or a predetermined number of times, particularly, the screw member is loosened to the predetermined state, and the rotation source is idled without the screw member being loosened to the predetermined state. In this case, erroneous detection that the screw member has been loosened to a predetermined state can be prevented.

Further, it is preferable to include a mode setting means for setting a rotation direction of the wrench. Thereby, the tightening and loosening device can be switched between the screw member tightening device and the screw member loosening device, and the tightening and loosening device is applied to both the right-hand screw member and the left-hand screw member. be able to.

Further, it is preferable to include a reference value setting device for setting the rotation time or the number of rotations of the wrench used for the determination in the signal processing means. Thus, the reference value of the rotation time or the number of rotations of the wrench can be set according to the type of the screw member, the amount of screwing, and the like.

The notifying means may include a plurality of notifying sections individually corresponding to the wrench and driven by an abnormal signal of the corresponding wrench. This makes it possible to easily confirm whether the screw member is properly tightened or loosened for each wrench.

[0018] Further, a support base for movably supporting the wrench in the moving direction of the mold on which the screw member is arranged, and an engagement mechanism arranged for each wrench for releasably engaging the mold. An engagement mechanism that receives a moving force from the mold while engaging with the mold and causes a corresponding wrench to move forward by following the movement of the mold; and the first position by simultaneously retracting the advanced wrench. It is preferable to include a returning mechanism. Thus, since the wrench reciprocates, there is no possibility that the hose or the like for the power for the rotation source is twisted.

In a preferred embodiment, the fastening device comprises:
The present invention is applied to a device for tightening or loosening a screw member disposed on a mold. The fastening device includes a plurality of processing mechanisms including a wrench that releasably engages the screw member and rotates the screw member around its axis, the processing mechanism including a wrench from a first position behind the moving direction of the mold. A plurality of processing mechanisms that are sequentially moved to a second position in front of the moving direction following the movement of the formwork, and a wrench is used until each processing mechanism moves from the first position to the second position. A moving mechanism for moving the wrench toward the screw member to engage the screw member and moving the wrench in a direction in which the wrench is released from the screw member to release the engagement between the wrench and the screw member; and a processing mechanism. A support base movably supporting in the moving direction of the frame, and an engaging mechanism arranged in each processing mechanism, which releasably engages with the mold and moves from the mold while engaged with the mold. Under the force, the corresponding processing mechanism is moved forward by following the movement of the formwork. Including a Rukakarigo mechanism and a return mechanism returning the advance has been the first position is retracted simultaneously wrench. Each wrench includes a rotating body that is releasably engaged with the screw member and a rotation source that rotates the rotating body. A notification device is provided for each wrench and detects a rotation of the corresponding wrench, and based on a detection signal of the rotation sensor, determines whether or not the screw member has been properly tightened or loosened. Judgment is performed for each wrench, and if the operation is not performed normally, a signal processing unit that outputs an abnormal signal to that effect for each wrench, and based on the abnormal signal from the signal processing unit, tightening or tightening the screw member And a notifying means for notifying that the loosening was not performed normally for each wrench.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a description will be given of an embodiment of a mechanical part of a fastening device. Referring to FIGS. 1 to 3, the tightening and loosening device 10 includes:
It is used as a device for tightening or releasing a plurality of screw members arranged on a flange on one side of the mold 12.

The formwork 12 is composed of a pair of halves 14a and 14b each having a semicircular cross-sectional shape and having a flange on one or both sides. In this state, the sheet is continuously moved from right to left in FIGS.

For example, as shown in FIG. 9 of JP-B-59-49169, both halves have a flange only on one side and are hinged on the other side. In the case of a linked formwork, one fastening device may be arranged near the moving path of the formwork 12.

However, for example, Japanese Patent Publication No. 59-49169
As shown in FIG. 1 of the publication, each half has a flange on each side and is fastened by a screw member at each flange. It is preferable that the tightening and loosening devices are arranged to face each other with respect to the moving path of the mold frame 12, and that the tightening operation of the screw members by the two tightening and loosening devices or the releasing operation thereof are performed in parallel.

As shown in a partially enlarged form in FIG. 4, the formwork 12 has both halves 14a and 14b with their flanges 16a and 14a.
16b is formed into a cylindrical shape by fastening with a screw member 18 at each of a plurality of positions, and is again divided into a pair of half bodies 14a and 14b by loosening the screw member 18.

In the embodiment shown in FIG.
Reference numeral 8 denotes a bolt of a known fastening device 20 described in Japanese Utility Model Laid-Open Publication No. 3-87206 and the like.
a and 16b are fixed to the corresponding half bodies 14a and 14b, respectively. However, the screw member 18 may be another member such as a nut.

Referring to FIG. 4, the fastening device 20 includes a holding member 22 fixed to the lower surface of the lower flange 16a coaxially with a hole formed in the lower flange 16a,
2, a nut 24 that is non-rotatably disposed and screwed with the screw member 18, a stopper 26 disposed in the holding member 22 to prevent the nut 24 from dropping from the holding member 22, and an upper flange 16b. Screw member 1 fixed to the upper surface of the upper flange 16b coaxially with the hole formed in
8 and a screw member 18.
A retaining ring 30 disposed so as to prevent the retaining member 28 from falling off from the retaining member 28, and an annular spring receiver 32 disposed between the head of the screw member 18 and the retaining member 28.
And a compression coil spring 34 disposed between the holding member 28 and the spring receiver 32.

Referring again to FIG. 1 to FIG.
0 denotes a support 40 arranged beside the moving path of the formwork 12.
Each of which is disposed on the support base 40 so as to be able to reciprocate between a first position behind the mold 12 in the moving direction and a second position ahead of the former, and rotates the screw member 18 (see FIG. And six engaging mechanisms arranged in each processing mechanism 42 so as to releasably engage with the formwork 12 and advance the corresponding processing mechanism 42 following the formwork 12. A return mechanism 46 for simultaneously moving the advanced processing mechanism 42 from the second position side to the first position side;
And a braking mechanism 48 disposed in each processing mechanism 42 so as to generate a braking force when the movement of the processing mechanism 42 is completed.

The support base 40 includes a pair of long bases 52 installed on the floor 50 in parallel with the moving path of the formwork 12, and both bases 5.
2, a long first movable table 54 movably installed in the vertical direction, and the first movable table 54 is moved in the left-right direction (the left-right direction in FIG. 2) horizontally crossing the moving path of the formwork 12. The second movable table 56 that is installed so as to support the processing mechanism 42
And

The first moving table 54 is moved in the front-rear direction and left-right direction by rods 58 extending upward from the respective ends of the bases 52 through the respective ends of the first moving table 54. Will be blocked. The position of the first moving table 54 in the vertical direction is
It can be adjusted by a plurality of jacks 60 using a hydraulic or pneumatic cylinder mechanism or the like.
2 can be adjusted. The rods 58 adjacent in the left-right direction are connected by a connecting member 62 at the upper end.

The second movable table 56 is movably engaged with a plurality of rails 64 provided on the upper surface of the first movable table 54 so as to extend in the left-right direction. Thus, the movement in the up-down direction and the front-back direction is prevented.
The position of the second moving table 56 in the left-right direction can be adjusted by a driving mechanism 66 disposed on the first moving table 54, and thereby the position of the processing mechanism 42 in the left-right direction with respect to the mold 12 is adjusted. be able to. Drive mechanism 66
Is a screw jack provided with a drive source such as an electric motor, a pneumatic motor, a hydraulic motor, and a solenoid mechanism.

The second moving table 56 has a pair of guide rails 68 on its upper surface for restricting the movement of the processing mechanism 42 with respect to the second moving table 56. The guide rail 68 extends parallel to the front-rear direction at locations spaced apart in the left-right direction on the upper surface of the second movable base 56. The processing mechanism 42 includes a guide rail 68
Are sequentially arranged in the direction of the guide rail 68 so as to be able to move in the same direction one after another. For this reason, the movement ranges of the processing mechanisms adjacent in the front-back direction are slightly shifted in the front-rear direction, though most of them overlap each other.

Referring to FIG. 3 to FIG.
Is a frame 70 disposed on the second movable base 56 so as to be reciprocally movable in the front-rear direction guided by both guide rails 68.
A moving body 72 movably arranged in the frame in the vertical direction; a wrench 74 supported by the moving body; and a vertical movement of the moving body 72 for engaging and releasing the wrench 74 with the screw member 18. A moving mechanism 76 for moving in the direction;
A cover 78 that protects the moving body 72 and the moving mechanism 76;

The frame 70 is manufactured in the form of a box opened to the side of the mold frame 12 by a plurality of plate members connected to each other. The moving body 72 is moved from the frame 70 to the moving body 72.
A plurality of rods 80 extending upward and in parallel through each other prevent movement in the front-rear direction and the left-right direction. The rod 80 is connected to the upper wall of the cover 78 at the upper end. In the illustrated example, the moving mechanism 76 includes a jack such as a hydraulic or pneumatic cylinder mechanism as a driving source.

As shown in FIGS. 3 to 5, the wrench 74 includes a wrench head portion, that is, a rotating body 82 that releasably engages with the screw member 18, and a rotation source 84 that rotates the rotating body. In the illustrated example, the rotation source 84 is a pneumatic motor,
Although a motor driven by a pressure fluid such as a hydraulic motor is provided, an electric motor may be provided instead of such a motor.

The wrench 74 has a pin 85 extending in the front-rear direction.
It is attached to the moving body 72 by mounting brackets 86 and 88 which are connected so as to be pivotable. Mounting bracket 86
Is mounted on the moving body 72 so that the mounting bracket 88 protrudes toward the formwork 12. The wrench 74 is mounted on the mounting bracket 8 so that the output shaft 90 of the rotation source 84 extends downward through a through hole formed in the mounting bracket 88 as shown in FIG.
8 attached.

Referring to FIG. 4, a pin 92 extending in the front-rear direction is attached to the mounting bracket 88.
Each end of the pin 92 is movably received along a hole 96 formed in the side wall 94 of the cover 78. The hole 96 has a first portion that extends upward from below and a second portion that gradually retreats from the upper end of the first portion to the side opposite to the mold 12.

For this reason, while the pin 92 is moved through the first portion of the hole 96, as shown in FIG. 3, the mounting bracket 88 adjusts the rotation axes of the wrench 74 and the rotating body 82 in the vertical direction. The rotating body 82 is maintained at a position corresponding to the moving path of the screw member 18 in the left-right direction. However, while the pin 92 is moved through the second portion of the hole 96, the mounting member 88 holds the rotating body 82 as shown in FIG.
To retreat from the path of travel.

Referring to FIG. 4, the rotating body 82 has a hexagonal cylindrical recess for receiving the head of the screw member 18 in a non-rotatable manner. The rotating body 82 is supported non-rotatably and vertically movably by an auxiliary member 98 attached to the output shaft 90 of the wrench 74 so as to extend further downward from the rotating shaft, and is disposed on the auxiliary member 98. Compression coil spring 10
It is biased downward by 0.

Referring to FIG. 6, each engagement mechanism 44 includes an engagement piece 102. The engaging piece 102 is attached to the frame 70 of the processing mechanism 42 by a pin 104 extending in the vertical direction so that the engaging portion 102a can enter and exit the moving path of the formwork.
Attached at the end opposite to 2a. The engagement piece 102 is pivotally connected to one end of the link piece 106. The other end of the link piece 106 is flexibly connected to one end of the link piece 108. The link piece 108 is
It is pivotally mounted on the frame 70 by a vertically extending pin 110 and is angularly rotated about the pin 110 by a drive mechanism 112.

The drive mechanism 112 has a hydraulic or pneumatic cylinder mechanism as a drive source in the illustrated example. In this cylinder mechanism, the cylinder is connected to the frame 70, and the piston rod is connected to the link piece 108.

When the drive mechanism 112 is extended, the link pieces 106 and 108 are extended, so that the engagement pieces 102 are extended.
Is protruded into the moving path of the formwork. On the other hand, when the drive mechanism 112 is contracted, the link piece 10
By bending 6, 108, the engaging portion 102a of the engaging piece 102 is retracted from the moving path of the formwork.

The engaging portion 102a of the engaging piece 102 engages with a predetermined portion of the mold when the projecting portion 102a protrudes into the moving path of the mold, whereby the engaging mechanism 46 follows the mold. As a result, the processing mechanism 42 is also advanced following the formwork. The region where the engaging portion 102a engages is the mold 12
, The screw member 18 itself, the fastening device 20 shown in FIG. 4, and the like. In the example shown in FIG.
The engaging portion 102a engages with the holding member 22 of the fastening device 20.

When the link pieces 106 and 108 are bent, the engaging portions 102a protrude into the moving path of the formwork. When the link pieces 106 and 108 are extended, the engaging portions 102a
May be retracted from the moving path of the formwork.

Each engagement mechanism 44 further includes a processing mechanism 42
A pair of slide shafts 114 are provided on the frame 70 so as to be able to reciprocate in the front-rear direction. Both slide shafts 114
Are connected at their leading ends and at their trailing ends by connecting members 116 and 118, respectively. The two slide shafts 114 are urged by a spring 120 so that most of them protrude forward from the frame 70.

When most of the two slide shafts 114 are retracted into the frame 70, the connecting member 118
08 is engaged with the link piece 108 so that the link piece 106, 108 is forcibly bent by pushing the link piece 108 backward. For this reason, when most of the two slide shafts 114 are retracted into the frame 70, the two link pieces 106 and 108 are pushed and bent by the connecting member, whereby the engaging portions 10 are bent.
2a is forcibly retreated from the moving path of the formwork.

Further, referring to FIGS. 1 to 3, the return mechanism 46 is a slider 1 disposed on the second movable base 56 so as to be reciprocally movable in the front-rear direction while being guided by both guide rails 68.
22 and a drive mechanism 124 for forcibly moving the slider 122 in the front-rear direction. The slider 122 is disposed in front of the processing mechanism 42 disposed at the forefront, and the processing mechanism 42 disposed at the forefront and the connecting member 1 disposed thereon.
16 is arranged so as to be able to abut.

In the illustrated example, the drive mechanism 124 includes a hydraulic or pneumatic cylinder mechanism as a drive source. The slider 122 is moved forward when the drive mechanism 124 is extended, and is moved backward when the drive mechanism 124 is contracted. The slider 122 has an abutment portion 126 that abuts the forefront processing mechanism 42 when the slider 122 is moved rearward. Therefore, when the drive mechanism 124 is contracted, it is moved rearward to move the frontmost processing mechanism 42 rearward, and as a result, the processing mechanism 42 comes into contact with the rear processing mechanism 42 one after another. Is simultaneously moved backward.

As shown in FIG. 4, the braking mechanism 48 includes a driving mechanism 130, a rod-shaped pusher 132 moved vertically by the driving mechanism, and a brake pad 134 attached to the lower surface of the pusher. Prepare. In the illustrated example, the driving mechanism 130 is a telescopic mechanism using a hydraulic cylinder mechanism, a pneumatic cylinder mechanism, a solenoid mechanism, or the like as a driving source.
It is attached to the upper wall of the frame 70. The pusher 132 slidably penetrates a collar 136 attached to the lower wall of the frame 70, and is connected to the drive shaft of the drive mechanism 130 at the upper end.

The pusher 132 is normally displaced upward by a spring (not shown). However, when the corresponding processing mechanism 42 is stopped, the brake pad 134 is pressed against the brake rail 138 attached to the first movable base 56 by being pushed down by the drive mechanism 130.

Still referring to FIGS. 1 and 2, when the forefront processing mechanism 42 is moved to the second position, the tightening / closing device 10 further moves the forefront processing mechanism 42 on its front surface. When the rearmost processing mechanism 42 is moved to the first position, the plurality of shock absorbers 140 attached to the slider 122 of the return mechanism 46 so that the rearmost processing mechanism 42 can be brought into contact with the rear surface. And a plurality of shock absorbers 142 attached to the second moving table 56. Shock absorber 1
Reference numeral 42 is attached to the second movable base 56 by an attachment plate 144.

The shock absorbers 140 and 142 reduce the impact and noise when the processing mechanism comes into contact. Therefore, the buffers 140 and 142 may be provided in the processing mechanism 42. Also, the second moving table 56 and the return mechanism 4
Depending on the shape of 6, the shock absorber 140 may be provided on the second moving table 56, or the shock absorber 142 may be provided on the return mechanism 46. Furthermore, a similar buffer is connected to the adjacent processing mechanism 4.
When the adjacent processing mechanism 42 approaches one of the two, it may be provided so as to be able to contact the other of the adjacent processing mechanisms 42.

At the time of standby, each processing mechanism 42 is set to the first position shown in FIG.
And the slider 12 of the return mechanism 46
2 has been moved to the forefront position. Fastening device 10
Is controlled by a control device (not shown).

When the first screw member 18 reaches a predetermined position with the movement of the mold frame 12, the driving mechanism 112 of the engagement mechanism 44 of the foremost processing mechanism 42 is first driven. As a result, the engagement portion 102a of the engagement piece 102 of the engagement mechanism 44 projects into the movement path of the
Of the foremost processing mechanism 42.
Is moved forward following the movement of the formwork 12 in a state of being positioned with respect to the screw member 18 by the engagement mechanism 44.

During this time, when the second screw member 18 reaches a predetermined position, the drive mechanism 112 of the engaging mechanism 44 of the second processing mechanism 42 is driven, and the second processing mechanism 42 is driven by the first processing mechanism 42 In the same manner as described above, the form 12 is advanced following the movement of the formwork 12. Hereinafter, each time the screw member 18 reaches a predetermined position, the processing mechanism 42 is moved forward following the movement of the mold 12.

The fact that the screw member 18 has reached the predetermined position can be detected by, for example, a sensor provided for each processing mechanism 42. As the sensor, a reed switch, a proximity switch, an optical sensor, or the like can be used. It is preferable that the height position of the sensed portion of the mold 12 sensed by the sensor be a different value for each processing mechanism 42.

While moving from the first position to the second position, each processing mechanism 42 rotates the rotating body 82 by the rotating source 84 for a predetermined time or number of times, while moving the moving body 72 and the wrench 74. After the screw member 18 is tightened or released by moving the moving member 76, the rotation of the rotating member 82 is stopped and the moving member 72 is raised, thereby moving the moving member 72 and the wrench 74 to the initial position. Perform the return operation.

The direction of rotation of the rotating body 82 differs depending on whether the tightening / releasing device 10 is for tightening or releasing the tightening, and also depending on whether the screw member 18 is a right-handed screw or a left-handed screw. . The start timing of rotation and descent of each wrench can be at the start of forward movement of the wrench, at the time of sensing by the sensor, or after a lapse of a predetermined time from any of them.

When each processing mechanism 42 reaches the vicinity of the second position, the driving mechanism 130 of the braking mechanism 48 is driven after the engaging portion 102a of the engaging mechanism 44 is retracted from the moving path of the formwork. As a result, it is stopped at the second position. Therefore, the stopping of each processing mechanism 42 becomes smooth. Engaging part 1
02a is retracted from the moving path of the formwork by the drive mechanism 112. However, even if the engaging portion 102a is not retracted from the moving path of the formwork, the engaging portion 102a of the sliding shaft 114 is retracted by the contact portion 126 of the slider 122 or the previous processing mechanism 42. The mold 12 is securely retracted from the moving path.

When all the processing mechanisms 42 are moved to the second position, the driving mechanism 124 of the return mechanism 46 is contracted, so that all the processing mechanisms 42 are collectively returned to the first position. Each processing mechanism 42 is also smoothly stopped by the braking mechanism 48 when returning to the first position.

The above steps are repeated until all the screw members 18 have been tightened or released.

According to the fastening device 10, the plurality of processing mechanisms 42 can be reciprocated to stop or release the screw member 18 without stopping the mold frame 12, and as a result, a large installation space can be obtained. It is unnecessary and the rotation source 84
There is no possibility that the hose 146 (see FIG. 4) for the pressurized fluid to be supplied to the device is twisted, so that the device is small and simple.

Since the processing mechanism 42 is advanced with the engagement mechanism 44 being engaged with the mold 12 in a state where the processing mechanism 42 is positioned with respect to the screw member 18, the moving state of the screw mechanism 18 is changed. The pitch changes according to the change of the arrangement pitch, the moving speed of the mold 12, and the like, and thus can be commonly used for various molds having different arrangement pitches of the screw members 18, the moving speed of the mold, and the like.

Note that the wrench 74 is used as in the case of the fastening device 10.
When the rotating body 82 is rotated by a rotating source 84 such as a motor, the impact, vibration and noise are smaller than when a rotating mechanism such as an impact wrench that generates a rotating force by an impact is used.

Next, an embodiment of the error notification device will be described. Referring to FIG. 7, the fastening device further includes a notification device 150 that displays, for each wrench, when the fastening or release of the screw member is not correctly performed.

A pressure fluid, such as compressed air, from a pressure fluid source 152, such as a compressor, is supplied to each wrench 74 by a hose 146. The pressure fluid supplied to each wrench 74 is supplied to the rotation source 84 via the solenoid valve 154. The rotation source 84 has a motor rotated by a pressure fluid, such as an air motor or a hydraulic motor. The solenoid valve 154 also has a switching function including a forward rotation side for rotating the rotation source 84 forward and a reverse rotation side for rotating the rotation source 84 in the reverse direction.

The notification device 150 includes a plurality of rotation sensors 156 for detecting that the wrench 74 has been rotated, and the rotation source 8.
4, a plurality of load sensors 158 for detecting that the load acting on the load 4 has reached a predetermined value, a mode setting switch 160 for setting an operation mode of the wrench, and a reference value setting device for setting a reference rotation time and a reference rotation speed. 162 and a signal processing circuit 16 for determining whether the screw member is properly tightened or loosened for each wrench.
4, a driver 166 for receiving an abnormal signal output from the signal processing circuit, and an alarm 168 driven by the driver.

A rotation sensor 156 is provided for each wrench 74. Each time the corresponding wrench 74 rotates a predetermined angle, preferably 360 degrees, an electric signal indicating that fact is sent to the signal processing circuit 164 as a detection signal. Supply. In the illustrated example, the rotation sensor 156 detects that the rotation source 84 has been rotated, but may detect that the rotating body 82 shown in FIG. 5 has been rotated. As the rotation sensor, for example, a known photoelectric switch commercially available as a rotary encoder can be used.

In the illustrated example, the load sensor 158 is a fluid sensor that detects that the pressure of the pressure fluid supplied to the rotation source 84 has reached a predetermined value, and is provided for each wrench 74. The load sensor 158 receives the pressure of the pressure fluid supplied to the rotation source 84 of the corresponding wrench while the solenoid valve 154 of the corresponding wrench is open, and when the pressure reaches a predetermined value. A sense signal indicating this is supplied to the signal processing circuit 164.

As such a load sensor 158, a pressure switch that opens or closes when a predetermined pressure is applied and outputs a sensing signal indicating that, and a pressure sensor that generates an electric signal corresponding to the applied pressure The pressure or action of the pressurized fluid supplied to the rotation source 84 is directly measured, such as a pressure detector using a comparison circuit that outputs a sensing signal indicating that the electric signal has reached a predetermined value. Alternatively, a device that receives indirectly and outputs a sensing signal directly or indirectly can be used.

The mode setting switch 160 is a wrench 74
In addition, the switch is used to specify the rotation direction of the rotation source 84 and the rotating body. With this switch, it is possible to specify whether the tightening device is to be used in a mode for tightening or for releasing the tightening device. It is possible to set which of the right-hand thread and the left-hand thread is to be used.

The reference value setting unit 162 sets the reference rotation time and the reference rotation speed of the wrench 74 and thus the rotation source 84 and the rotating body. The reference rotation time and the reference rotation speed are values for tightening and releasing the screw member by using a wrench, and are used in the signal processing circuit 164 to determine whether the screw member has been correctly tightened or released. Can be The reference rotation time and the reference rotation speed can be changed according to the operation mode of the fastening device, the type of the screw member, the amount of screwing, and the like, but may be fixed.

The signal processing circuit 164 is provided for each rotation sensor 15.
6. Based on signals from the load sensors 158, the switch 160, and the setting device 162, it is determined for each wrench whether or not the screw member has been properly tightened or released,
If the operation is not performed normally, an abnormal signal indicating that fact is output to the driver 166 for each wrench.

The driver 166 drives the alarm 168 in response to the supply of the abnormal signal. The alarm 168 includes an indicator light provided for each wrench and a buzzer commonly used for the wrench.

In the illustrated example, the signal processing circuit 164 also serves as a control circuit for the tightening and loosening device. Therefore, various kinds of control signals such as a drive command signal and a stop command signal are transmitted to the wrench, each drive mechanism and the like. Output to device. However, the signal processing circuit 1
64 and a control circuit of the fastening device may be provided separately. In this case, the mode specifying signal, the reference value of the rotation time and the reference number of the rotation speed may be supplied from the control circuit of the tightening device to the signal processing circuit 164.

Next, referring to FIG. 8, signal processing circuit 16
The operation for tightening the screw member according to No. 4 will be described.

When the switch 160 is set to the tightening mode for tightening the screw member, the signal processing circuit 164
First, a forward rotation start command is output to the wrench (step 20).
1). As a result, the forward rotation side of the solenoid valve 154 of the wrench is opened, and the rotation of the wrench rotation source 84 causes the screw member to be tightened (hereinafter simply referred to as “tightening”). Wrench sensor 1
The detection signals 56 and 158 are supplied to the signal processing circuit 164.

Next, the signal processing circuit 164 determines whether or not the wrench is rotating forward (step 202). This determination can be made, for example, using the output signal of rotation sensor 156. If the wrench has not been rotated forward, the signal processing circuit 164 returns to step 201.

However, if the result of determination in step 202 is that the wrench has been rotated forward, the signal processing circuit 164
Waits for the reference rotation time set in the setting device 162 (step 203). During this time, tightening with a wrench is performed. The reference rotation time in the tightening mode is a value such that the tightening is completed.
It can be 3 seconds.

Next, the signal processing circuit 164 determines whether the wrench has stopped (step 204). If the result of this determination is that the wrench has been stopped, the wrench has stopped before the time for sufficiently tightening has elapsed, so the signal processing circuit 164 outputs an abnormal signal to the driver 166 (step 205), Driver 1
At 66, the buzzer of the annunciator 168 is sounded and the indicator light corresponding to the abnormal signal is turned on (step 206).

However, if the result of the determination in step 204 is that the wrench is rotating, it means that the wrench has been continuously rotated for a time sufficient for tightening, so that the signal processing circuit 164 applies a load acting on the rotation source, Load sensor 8
It is determined whether or not an ON signal indicating that the pressure of the fluid acting on the fluid 4 has reached a predetermined value is supplied from the load sensor 84 (step 207).

The determination in step 207 is based on the fact that when the screw member is tightened to a predetermined state, the load on the rotation source 84 increases and the pressure of the pressure fluid supplied to the rotation source 84 increases. It is to determine whether the member has been sufficiently tightened. Therefore, step 207 can be performed by confirming whether the load sensor 84 outputs an ON signal or an OFF signal as a sensing signal.

If the result of determination in step 207 is that the load sensor 84 has output an OFF signal, it means that the screw member has not been sufficiently tightened, and the signal processing circuit 164 returns to step 204.

When the wrench is stopped in the state where the process returns from step 207 to step 204, the screw member is not sufficiently tightened even though the wrench has rotated for a time sufficient for tightening the screw member. The wrench has stopped. Therefore, in such a case, the signal processing circuit 164 performs steps 205 and 206
Execute

If the result of determination in step 207 is that the load sensor 84 outputs an ON signal, it means that the screw member has been sufficiently tightened, and the signal processing circuit 164 outputs a normal signal (step 208). ).

Next, referring to FIG. 9, the signal processing circuit 16
4 will be described.

When the switch 160 is set to the loosening mode for releasing the tightening of the screw member, the signal processing circuit 1
64 first outputs a reverse rotation start command to the wrench (step 211). Thereby, the solenoid valve 154 of the wrench
Is released to the reverse rotation side, the tightening of the screw member is released (hereinafter simply referred to as “release”) by the rotation source 84 of the wrench being reversed, and the detection of the sensors 156 and 158 is performed. The signal is sent to the signal processing circuit 164.
Supplied to

Next, the signal processing circuit 164 determines whether or not the wrench is reversed (step 212). This determination can be made, for example, using the output signal of rotation sensor 156. If the wrench has not been reversed, the signal processing circuit 164 returns to step 211.

However, if the result of determination in step 212 is that the wrench has been reversed, the signal processing circuit 164
Waits for another reference rotation time set in the setting device 162 (step 213). During this time, the tightening is released by the wrench. The reference rotation time in the loosening mode is a value sufficient to complete the release of the tightening, and may be, for example, one second.

Next, the signal processing circuit 164 determines whether the wrench has stopped (step 214). If the result of this determination is that the wrench has been stopped, the wrench has stopped before the time at which the release of the tightening is reliably terminated, so the signal processing circuit 164 outputs an abnormal signal to the driver 166 ( (Step 215) The driver 166 sounds the buzzer of the alarm 168 and turns on the indicator lamp corresponding to the abnormal signal (Step 216).

However, if the result of the determination in step 214 is that the wrench is rotating, it means that the wrench has been continuously rotated for a time sufficient to release the tightening, so that the signal processing circuit 164 determines the actual rotational speed of the wrench. It is determined whether or not has reached the reference rotational speed set in the setting device 162 (step 217). The reference rotation speed used in step 217 is
This is a value at which the screwing between the male screw portion and the female screw portion is completely released.

When the screw member is loosened to a predetermined state, the load on the rotation source 84 decreases, and the pressure of the pressure fluid supplied to the rotation source 84 decreases.
The determination in step 217 may be made by confirming whether the signal is being output or the OFF signal is being output.

If the result of determination in step 217 is that the reference rotation speed has not been reached, it means that the screw member has not been loosened sufficiently, and the signal processing circuit 164 returns to step 214.

When the wrench is stopped while returning from step 217 to step 214, it means that the wrench has been stopped without the screw member being sufficiently loosened. Therefore, the signal processing circuit 164 executes the steps 215 and 216. Execute

If the result of determination in step 217 is that the reference rotational speed has been reached, it means that the screw member has been sufficiently loosened, and the signal processing circuit 164 outputs a normal signal (step 218).

The steps shown in FIG. 8 and FIG.
0 is performed for each wrench in synchronization with the operation of each device.
In particular, steps 201 and 211 are performed in synchronization with the lowering of the wrench. Steps 201 and 211 comprise
For example, it is possible to detect that the movement of the wrench has started, and to execute from that time. Instead of using the reference rotation time for the determination in steps 203 and 213, the reference rotation speed may be used.

When the above steps for all the wrenches are completed, the signal processing circuit 164 returns to the initial state, and waits for tightening or releasing the next plurality of screw members as many as the number of wrenches.

[0097] However, when the abnormality is notified,
It is preferable that the signal processing circuit 164 stop the movement of the mold when the tightening or releasing of the same number of screw members as the number of wrenches is completed. This allows the operator to repair, replace, or manually tighten or release a screw member that is under-tightened or under-released.

The present invention can be applied to any of a dedicated fastening device, a dedicated fastening release device, and a shared fastening and releasing device. When a load sensor is not used, another mechanism such as an electric motor may be used as the rotation source 84. Further, the driving mechanisms 66, 112, 124,
130 and the moving mechanism 76 may be a mechanism including another drive source.

In the above embodiment, the load acting on the rotation source is sensed by sensing the pressure of the pressurized fluid acting on the rotation source with the load sensor. May be detected by the load sensor. The present invention is applicable not only to a device for reciprocating a wrench, but also to a device for circulating a wrench along a closed loop.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a fastening device according to the present invention.

FIG. 2 is a plan view of the fastening device shown in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a sectional view showing an embodiment of a wrench.

FIG. 5 is a sectional view showing one embodiment of a rotating body and a screw member.

FIG. 6 is a view showing an embodiment of an engagement mechanism.

FIG. 7 is a block diagram of an electric circuit showing an embodiment of a notification device.

FIG. 8 is a diagram for explaining the operation of the notification device in the tightening mode.

FIG. 9 is a diagram for explaining the operation of the notification device in the loosening mode.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tightening device 12 Formwork 18 Screw member 20 Fastening device 40 Support base 42 Processing mechanism 44 Engaging mechanism 46 Return mechanism 48 Braking mechanism 74 Wrench 82 Rotating body 84 Rotation source 154 Solenoid valve 160 Mode setting switch 162 Reference value setting device

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B28B 17/00 B28B 7/00 B23P 19/06

Claims (8)

(57) [Claims] 1. A plurality of wrenches for tightening or loosening a screw member, the wrenches being moved from a first position to a second position ahead of the first position, and an error in tightening or loosening the screw member by the wrench. And a notification device that detects and outputs a detection signal by detecting that the corresponding wrench has been rotated, the plurality of rotation sensors individually corresponding to the wrench. A determination is made for each wrench as to whether the screw member has been properly tightened or loosened based on the rotation sensor of the rotation sensor and a detection signal of the rotation sensor. Signal processing means for outputting an abnormal signal to be performed for each wrench, and for each wrench, information that the screw member has not been properly tightened or loosened based on the abnormal signal from the signal processing means. And a notifying device. 2. The signal processing device according to claim 1, wherein the signal processing unit determines whether the screw member has been properly tightened or loosened based on whether the wrench has been rotated for a predetermined time or a predetermined number of times. Tightening device. 3. The wrench includes a rotating body that is releasably engaged with a screw member, and a rotation source that rotates the rotating body. The notification device further includes a load acting on the rotation source. A load sensor for detecting that the wrench has reached a predetermined value and outputting a detection signal, wherein the signal processing means detects a detection signal of the load sensor after the wrench has been rotated for the predetermined time or the predetermined number of times. 3. The tightening and loosening device according to claim 2, further comprising outputting a normal signal indicating that the screw member has been normally tightened or loosened. 4. The method according to claim 1, wherein the wrench is rotated for the predetermined time or the predetermined number of times, and then the wrench is rotated for an additional predetermined time or the predetermined number of times to tighten or loosen the screw member. 4. The tightening device according to claim 2, wherein a normal signal is output to indicate that the operation has been performed normally. 5. The fastening device according to claim 1, further comprising a mode setting means for setting a rotation direction of the wrench. 6. The tightening device according to claim 1, further comprising a reference value setting device that sets a rotation time or the number of rotations of the wrench used for the determination in the signal processing unit. 7. The tightening and tightening device according to claim 1, wherein the notifying unit includes a plurality of notifying units individually corresponding to the wrench and driven by an abnormal signal of the corresponding wrench. apparatus. 8. A support base for supporting the wrench movably in a moving direction of the mold on which the screw member is arranged, and an engaging mechanism arranged for each wrench, wherein the wrench is released from the mold. An engagement mechanism that receives the moving force from the mold while engaging with the mold to advance the corresponding wrench by following the movement of the mold, and an advanced wrench. The tightening device according to any one of claims 1 to 7, further comprising a return mechanism for simultaneously retreating and returning to the first position.