JP6032711B2 - Drum can band fastening device and drum can lid closing machine - Google Patents

Description

  The present invention relates to a technique for automatically opening and closing a canopy of an open drum.

  An open-type drum can (open drum) with a removable canopy is used to store contents (viscous fluid, powder, solids, etc.) that take time to put in and out of a closed drum. Also, this type of drum can is useful when the inside is cleaned and reused.

  A metal band is used to fix the canopy in the open drum. The band is a substantially annular member in which a ring having a size surrounding the canopy is partially cut out. The cross section along the radial direction of the band is formed into a curved shape (for example, U-shaped) with a concave inside so as to cover the curled outwardly provided curl provided at the opening end of the drum can and the peripheral edge of the canopy overlapping therewith. ing.

  A bolt type band is a band that uses bolts for band tightening to narrow the diameter of the band. The bolt type is widely adopted because it has a simpler structure than the lever type. In the bolt type band, metal fittings called S-shaped rings are attached to both ends of the notch portion by, for example, welding. Bolts are passed through these S-shaped rings, and nuts are screwed into the threaded portions of the protruding bolts. A nut may be welded to one S-shaped ring in advance. By screwing the bolt into the nut, the notch is narrowed and the band is tightened. If the band is forcibly expanded by rotating the bolt in the direction to remove it from the nut, the canopy is tightened by the band.

  Conventionally, automation of contents in and out of a drum can has been promoted, and a device for automatically opening and closing a canopy equipped with a bolt type band has been proposed. For example, Patent Document 1 discloses a lid opening device that integrally separates a canopy and a band from a drum can in a state where the band is loosened without removing bolts and nuts from the band. The same document describes a device configuration in which a claw portion hooked on an S-shaped ring is provided on the bolt head to prevent co-rotation with the nut, and the band is tightened or loosened by turning the nut with a nut runner. . And to cope with the situation where there are variations in the nut position in the drum cans to be processed one after another, the nut runner uses a flexible joint for the nut runner or makes the nut runner part movable, and a tapered guide cone. A method for eating a nut on a nut is disclosed.

Japanese Patent Laid-Open No. 2003-3000593

  When a flexible joint is used as in the above prior art and the bolt or nut is rotated in a state where the core is displaced between the nut runner and the bolt, it is difficult to optimize the tightening torque. In the alignment (centering) of the shaft by the guide cone, only a misalignment of about ± 2 mm can be allowed.

  However, the mounting position of the bolt in the band differs depending on the manufacturer of the band and the manufacturing time, and the position of the bolt is shifted due to deformation of the drum can or the band during reuse. When the position of the bolt is out of the allowable range, the band cannot be automatically tightened or loosened.

  In view of such circumstances, an object of the present invention is to widen an allowable range of displacement of a bolt height position in automation of a bolt turning process for tightening or loosening a bolt type band.

Apparatus for achieving the above object is a bolt-type band drum band clamping device clamping or loosening of securing the canopy to the drum, the band has a substantially annular cutting a ring partially cut lacks both ends to the bolt of the bracket is clamped to the bracket portion are those that have passed through, the bolt of the band that is mounted to the canopy arranged in a direction along the horizontal direction, a pair A bolt chucking mechanism that moves the chuck claw portion up and down in the gap between the metal fittings, a nut runner to which a socket that engages the head of the bolt is attached, the bolt chucking mechanism, and the The nut runner is integrally supported, and when the pair of chuck claws sandwich the bolt, the rotation shaft of the nut runner is connected to the pair of chucks. Positioning the vertical center of the opposing gap of the claw portion, and a vertically movable support, so that the pair of chuck jaws of the open state approaches to the bolt along the radial direction of the bolt or so away from the bolt And an actuator for moving the support in a horizontal direction, and the socket is engaged with the bolt in a state of being sandwiched in a radial direction in a gap between the metal fittings by the pair of chuck claws. Later, the bolt is rotated by the nut runner .

  According to the present invention, since the bolt chucking mechanism pinches the bolt, the rotation axis of the nut runner is forcibly positioned in the height direction with respect to the bolt, so that the pair of chuck claws are in the most open state. Deviations in the height position of the bolt can be allowed to the extent that the bolt enters the gap.

It is a schematic diagram of operation | movement of the lid closing machine for drums which concerns on embodiment of this invention. It is a side view of the canopy conveyance unit with which the lid closing machine for drums is equipped. It is a front view of a canopy conveyance unit. It is a front view of the centripetal clamp mechanism provided in the canopy transport unit. It is a bottom view of a centripetal clamp mechanism. It is the perspective view by which the band and the bolt chucking mechanism with which a canopy conveyance unit is equipped were drawn. It is a figure which shows the band chuck nail | claw part with which a bolt chucking mechanism is equipped. It is a side view of the part to which the band fastening apparatus in the canopy conveyance unit was attached. It is a front view of a bolt chucking mechanism and a nut runner. It is a figure which shows the process of centering by the chucking of a volt | bolt. It is a figure which shows the stopper with which a bolt chucking mechanism is equipped. It is a top view of the mechanism which positions a canopy conveyance unit with respect to a drum can. It is a bottom view of the principal part of the mechanism which positions a canopy conveyance unit with respect to a drum can.

  FIG. 1 shows an outline of the operation of a drum can lid closing machine 100 according to an embodiment of the present invention. The operation process seen from the front of the drum can lid closing machine 100 is schematically depicted in the upper half of the figure, and the operation process seen from the upper side of the drum can lid closing machine 100 is schematically depicted in the lower half of the figure. It is.

  The drum can lid closing machine 100 is a capping device that automatically covers and fixes an open drum can with a canopy. The drum can lid closing machine 100 is loaded with the drum can 3 with the opening facing upward and the canopy 4 to which the bolt type band 5 is previously attached.

  The drum can lid closing machine 100 has four zones Z1, Z2, Z3, and Z4 arranged in the left-right direction. The first zone Z1 is a zone that accommodates the carried canopy 4. The second zone Z2 is a zone in which the canopy transport unit 30 chucks the canopy 4. The third zone Z3 is a zone in which the canopy 4 moves toward the fourth zone Z4. The fourth zone Z4 is a zone for fixing the canopy 4 to the drum 3.

  In the first zone Z1, the canopy 4 is placed on the transport table 20. At this stage, the canopy 4 is arranged substantially horizontally. A band 5 and a seal material (not shown) are attached to the canopy 4, and the band 5 is fastened to the canopy 4 with bolts 6 so that the canopy 4 and the band 5 do not shift. In this example, the canopy 4 is positioned in the circumferential direction so that the bolt 6 attachment portion is located on the front side of the drum can lid closing machine 100, and the bolt 6 is directed in the left-right direction with its head facing the left side. Placed in. However, the orientation of the canopy 4 in the circumferential direction is not limited to this, and the left and right orientations of the bolts 6 may be opposite to those illustrated.

  The carrier 20 on which the canopy 4 is placed moves horizontally to the second zone Z2. In the second zone Z2, when the canopy 4 is transported from the first zone Z1, the canopy transport unit 30 is waiting on the upper side. A canopy chucking mechanism 35 is assembled to the canopy transport unit 30. The carriage 20 moves up to bring the canopy 4 close to the canopy chucking mechanism 35, and the canopy chucking mechanism 35 chucks the canopy 4 by suction onto the upper surface of the canopy 4 and gripping the outer edge of the band 5. Thereafter, the transport table 20 descends and returns to the first zone Z1.

  As depicted in the lower half of the figure, when the canopy 4 is carried into the second zone Z2, the center G4 of the canopy 4 and the axis G30 of the canopy transport unit 30 may be misaligned. The axis G30 here is a reference position for positioning (centering) the canopy transport unit 30 in plan view. When the center G4 and the axis G30 are thus shifted, when the canopy chucking mechanism 35 grips the canopy 4, the canopy chucking mechanism 35 is aligned with the canopy 4 by a centripetal clamp described later. Freely move horizontally. Thereby, the shift | offset | difference of the center G4 and the shaft center G30 is eliminated.

  A nut runner 8 is assembled to the canopy transport unit 30 as a band fastening tool. The nut runner 8 rotates the bolt 6 of the band 5 to tighten or loosen the band 5. In order to properly control the rotational torque when the bolt 6 is screwed, it is necessary to center the rotational axis of the nut runner 8 and the bolt 6. However, there is variation in the height position of the bolt 6 due to individual differences between bands and drums. Therefore, the canopy transport unit 30 includes a bolt chucking mechanism (not shown in FIG. 1) that forcibly positions the rotation shaft of the nut runner 8 at the height position of the bolt 6. Details of the bolt chucking mechanism will be described later.

  In the second zone Z <b> 2, the nut runner 8 is positioned with respect to the bolt 6, the nut runner 8 approaches the bolt 6, and the head of the bolt 6 fits into the socket attached to the tip of the rod of the nut runner 8. The canopy transport unit 30 moves from the second zone Z2 toward the fourth zone Z4 while rotating the bolt 6 to loosen the band 5.

  While passing through the third zone Z3, tightening with the bolt 6 is loosened, and the diameter of the band 5 is expanded. At this time, the outer shape of the band 5 is restricted to a circular shape by a centripetal clamping mechanism interlocked with the rotation of the bolt 6. As shown in the lower half of the figure, the axis G30 and the center G4 of the canopy 4 coincide with each other in the canopy transport unit 30 that passes through the third zone Z3. This is because the canopy chucking mechanism 35 aligns the canopy transport unit 30 with the canopy 4 in the second zone Z2 as described above.

  In the fourth zone Z4, the canopy transport unit 30 descends to bring the canopy 4 into contact with the drum can 3. In the middle of the descent, the four positioning rollers 51, 52, 53, 54 arranged below the canopy chucking mechanism 35 face the peripheral side surface of the drum can 3. The set of rollers 51 and 52 and the set of rollers 53 and 54 move horizontally in the front-rear direction so as to approach the axis G30 and clamp the drum 3. The canopy transport unit 30 freely moves in the horizontal direction so that the four rollers 51, 52, 53, 54 are in contact with the drum 3 evenly. Thereby, the center G3 of the drum can 3 in plan view, the axis G30 of the canopy transport unit 30 and the center G4 of the canopy 4 coincide.

  The canopy 4 comes into contact with the drum can 3 with the drum can 3 being centered. Since the band 5 is loose and kept circular, the band 5 covers the periphery of the drum 3 evenly over its entire length. When the nut runner 8 rotates the bolt 6 in a predetermined direction, the band 5 is tightened and the canopy 4 is fixed to the drum 3.

  Thereafter, the canopy transport unit 30 is lifted by releasing the chucking of the canopy 4 and returns to the standby position of the second zone Z2. The capped drum 3 is carried out from the drum lid closing machine 100, and the next drum to be processed is carried into the fourth zone Z4.

  The above operation is controlled by a controller (not shown) of the drum can lid closing machine 100 or a processing system including the drum can lid closing machine 100.

  FIG. 2 shows the configuration of the canopy transport unit 30 as viewed from the front of the drum can lid closing machine 100, and FIG. 3 shows the configuration of the canopy transport unit 30 as viewed from the right side of the drum can lid closing machine 100.

  2 and 3, the canopy transport unit 30 is attached so as to be suspended from a carriage 103 straddling a pair of beams 101 extending in parallel in the left-right direction M1. The carriage 103 runs on the rail 102 provided on the beam 101, and the canopy transport unit 30 moves in the left-right direction M1 together with the carriage 103. For the movement of the carriage 103, an actuator 105 shown in FIG. 3 is used.

  The canopy transport unit 30 is floating with respect to the carriage 103 so as to be movable within a predetermined range in the front-rear direction M2. As a result, the entire canopy transport unit 30 can be shifted in the front-rear direction M2 so as to match the drum 3.

  As shown in FIG. 2, the carriage 103 and an actuator 105 (see FIG. 3) that travels the carriage 103 are connected via a spring 107. Thus, when the canister transport unit 30 is transported to the fourth zone Z4 and the actuator 105 is stationary, the canopy transport unit 30 is corrected so as to correct the deviation when the drum can 3 and the canopy 4 are aligned. It can be moved minutely in the left-right direction M1.

  As shown in FIG. 3, the canopy transport unit 30 includes a fluid pressure cylinder 31 as an elevating means for moving the canopy chucking mechanism 35 up and down, a band fastening device 38 for fastening and loosening the band 5, and positioning with respect to the drum can 3. At this time, a pair of frames 41 and 42 that move in the front-rear direction M2 are provided. The canopy chucking mechanism 35 includes a centripetal clamp mechanism 36 that clamps the band 5 from the outside.

  4 shows the configuration of the centripetal clamp mechanism 36 viewed from the rear of the drum can lid closing machine 100, and FIG. 5 shows the configuration of the centripetal clamp mechanism 36 viewed from below the drum can lid closing machine 100.

  The centripetal clamp mechanism 36 has a plate 361 and a ring 362 rotatably attached to the plate 361. In the plate 361, five sliders 363 are arranged at substantially equal intervals along a virtual circle concentric with the center of rotation of the ring 362 so as to surround the ring 362. The number of sliders 363 may be three or more. Each slider 363 is movable in the radial direction of the virtual circle.

  Each slider 363 is provided with a roller 364 that can freely rotate around an axis in the vertical direction, one by one as a clamping claw portion that comes into contact with the band 5. The inner end of each slider 363 and the ring 362 are connected by a belt-like link 365. The link 365 is longer than the distance between the ring 362 and the slider 363 and can rotate with respect to both the ring 362 and the slider 363.

  In the centripetal clamp mechanism 36, the ring 362 rotates by an angle corresponding to the amount of expansion and contraction as the rod of the actuator 366 expands and contracts. In the figure, when the rod is extended, the ring 362 rotates clockwise, the slider 363 is pulled by the link 365, and the five rollers 364 move inward all at once. Conversely, when the rod contracts, the five rollers 364 move outward at the same time. The clamp diameter determined by the five roller positions can be adjusted by controlling the actuator 366.

  A bolt chucking mechanism 380 is depicted in FIG. The bolt chucking mechanism 380 includes a pair of prismatic chuck claw portions 381 that can move up and down, and an actuator 383 that moves the chuck claw portions 381. The maximum facing gap between the pair of chuck claws 381 (that is, the maximum value of the height of the work that can be chucked) is a value obtained by adding an allowable amount of variation in the height position of the bolt 6 to the diameter of the threaded portion of the bolt 6. Has been selected. In this example, both of the pair of chuck claws 381 move in the opposite directions at the same time and equally. However, the configuration is not limited to this, and only one of them may move.

  The bolt chucking mechanism 380 moves integrally with the nut runner 8 in the front-rear direction M2 and the vertical direction M3. Thereby, the center of the bolt 6 and the nut runner 8 can be centered, and the socket 8A can be properly engaged with the head of the bolt 6. The centering procedure will be described later.

  In FIG. 6, a pair of band chuck claws 451 is shown. The band chuck claw 451 is used for forcibly expanding the notch portion of the band 5 when the band 5 is loosened. When the band 5 is loosened, the upper end portion of the band chuck claw 451 is in contact with the circumferential surface of the bolt 6 exposed in the opposing gap in the opposing gap of the pair of S-shaped rings 61 fixed to the band 5. Get in. At this time, the band chuck claw 453 shown in FIG. 7 presses the S-shaped ring 61 from above. In conjunction with the rotation of the bolt 6 by the nut runner 8, the pair of band chuck claws 451 move away from each other. As a result, the S-shaped ring 61 is pushed in the circumferential direction of the band 5 and the notch is expanded. In combination with the expansion by the band chuck claw 451 and the restriction of the outer shape by the centripetal clamp mechanism 36 described above, the band 5 is loosened while reliably exhibiting a circular shape.

  FIG. 8 shows the configuration of the band fastening device 38. The band fastening device 38 has the above-described bolt chucking mechanism 380, the nut runner 8, and a horizontal plate 390 as a support body that can move up and down. The bolt chucking mechanism 380 is disposed below the horizontal plate 390 and is screwed to the horizontal plate 390 via an angle 391. The nut runner 8 is also disposed below the horizontal plate 390 and is assembled to the horizontal plate 390 via a slider 392 that can move in the front and back direction of the drawing.

  The horizontal plate 390 is supported by a rail 393A at the lower end of the angle 393, and can move in the front-rear direction M2. An actuator 395 that moves the horizontal plate 390 relative to the angle 393 is assembled on the upper surface of the horizontal plate 390. When the horizontal plate 390 moves, the bolt chucking mechanism 380 inevitably approaches the bolt 6 or moves away from the bolt 6.

  The angle 393 that indirectly supports the bolt chucking mechanism 380 is movable in the vertical direction M3 with respect to the canopy chucking mechanism 35 connected via the rail 394. The band fastening device 38 is assembled with an air balancer 396 having a position holding capability corresponding to the weight of the angle 393 and the portion supported by the angle 393. Thus, the height positions of the bolt chucking mechanism 380 and the nut runner 8 are maintained unless an external force in the vertical direction M3 is applied. Since the load of the nut runner 8 is not applied to the socket 8A in a state in which the socket 8A is engaged with the bolt 6, no unnecessary force acts on the engaging portion.

  FIG. 9 shows a mounting structure of the bolt chucking mechanism 380 and the nut runner 8 as seen from the rear of the drum can lid closing machine 100. The slider 392 that supports the nut runner 8 is assembled to the horizontal plate 390 via a rail 398. An actuator 399 that moves the nut runner 8 in the left-right direction M <b> 1 via the slider 392 is attached to the upper surface of the horizontal plate 390.

  10A to 10C show the centering process by bolt chucking.

In FIG. 10A, the pair of chuck claws 381 are separated from the bolt 6 of the band 5. Then, the rotation shaft of the nut runner 8 that moves in the front-rear direction M2 and the vertical direction M3 to the actuator 38 3 integrally for opening and closing the chuck jaws 381, greatly shifted in the longitudinal direction M2 relative to the bolt 6, compared to the vertical direction M3 Is slightly smaller. The nut runner 8 and the chuck claw portion 381 in such a state are moved closer to the bolt 6 by operating the actuator 395 shown in FIG.

  The movement of the nut runner 8 and the chuck claw portion 381 approaching the bolt 6 stops when the tip end surface of the stopper 386 contacts the peripheral surface of the bolt 6 as shown in FIG. The stopper 386 is fixed to the end face of the actuator 383 as shown in FIG. The distance in the front-rear direction M2 between the rotation shaft of the nut runner 8 and the tip surface of the stopper 386 is set to the value of the radius of the bolt 6. Therefore, in the stage of FIG. 10B, the centering of the nut runner 8 and the bolt 6 is completed in the front-rear direction M2. However, there is a shift between the nut runner 8 and the bolt 6 in the vertical direction M3.

  Therefore, the pair of chuck claws 381 are moved in the vertical direction M3 so that they approach each other. That is, the actuator 383 is closed. In the case of the illustration, the lower chuck claw 381 comes into contact with the bolt 6 first in the process in which the facing gap between the chuck claw 381 is gradually narrowed. Then, the driving force of the actuator 383 that further closes the chuck claw 381 becomes a force that pushes down the actuator 383 against the stationary force by the air balancer 396, and the nut runner 8 that moves up and down integrally with the actuator 383 moves downward. Moving. This movement stops when both of the pair of chuck claws 381 contact the bolt 6 as shown in FIG.

  In the stage of FIG. 10C, the bolt 6 is sandwiched between the pair of chuck claws 381. When the nut runner 8 is mounted in advance, the rotation axis of the nut runner 8 is positioned at the center in the vertical direction M3 in the gap between the pair of chuck claws 381. Therefore, when the bolt 6 is sandwiched, the nut runner 8 and the bolt 6 Will be centered.

  FIG. 12 is a top view of the positioning mechanism 50 for centering the drum can 3 and the canopy transport unit 30, and FIG. 13 is a bottom view of the main part of the positioning mechanism 50.

  The positioning mechanism 50 includes a pair of frames 41 and 42 that can move in the front-rear direction M3 on both sides of the drum can 3 in the front-rear direction M3. The frames 41 and 42 are rectangular as shown in FIG. 2, and the lower end side is a free end as shown in FIG. The symmetrical plates 43 and 44 having two protrusions are fixed to the lower end surfaces of the frames 41 and 42, and clamp rollers 51, 52, 53 and 54 are attached to the tips of the protrusions of the plates 43 and 44. Is attached.

  When the frames 41, 42 move so as to approach each other, the rollers 51, 52, 53, 54 abut against the side surface of the drum can 3. After any of the rollers abuts, the entire canopy transport unit 30 including the positioning mechanism 50 is arranged in the left-right direction M1 and the front-rear direction so that all of the four rollers 51, 52, 53, 54 abut against the drum 3 evenly. Move small to M2. As a result, the drum 3 and the canopy transport unit 30 are centered as described above.

  In the illustrated positioning mechanism 50, the actuator 55 moves the pair of frames 41 and 42 in the front-rear direction M <b> 3. In order to bring the pair of frames 41 and 42 closer to the axis G30 of the canopy transport unit 30 simultaneously and at the same distance, a symmetrical movement mechanism combining the pinion gear 56 and the pair of racks 57 and 58 is assembled to the positioning mechanism 50. ing. When the rod of the actuator 55 expands and contracts, the frame 42 and the rack 58 connected to the rod move, and at the same time, the pinion gear 56 that meshes with the rack 58 rotates to bring the rack 57 and the frame 41 connected thereto in the opposite direction. Moving.

  In the above embodiment, the drum can lid closing machine 100 can be used as a lid opening machine that automatically removes the canopy 4 from the drum 3. In that case, the nut chuck 8 and the bolt 6 are centered using the bolt chucking mechanism 38 in the fourth zone Z4, and the operations described in FIG. 1 for the other processes may be performed in the reverse order. .

  The structure, shape, overall configuration, and operation of each part of the drum can lid closing machine 100 can be changed as appropriate within the scope of the present invention. A known drive source such as a hydraulic cylinder or an electric motor may be used as an actuator disposed at various places including the actuator 383 of the bolt chucking mechanism 380. Link motion or other centripetal clamping techniques can be used for centering the drum 3.

3 Drum can 4 Canopy 5 Band 6 Bolt 8 Nut runner 8A Socket 38 Band tightening device M1 Left and right direction (horizontal direction)
M2 longitudinal direction (horizontal direction)
M3 Vertical direction 380 Bolt chucking mechanism 381 Chuck claw 380 Bolt chucking mechanism 390 Horizontal plate (support)
395 Actuator 386 Stopper
451 Band chuck claw 100 Drum can lid closing machine 30 Canopy transport unit 31 Fluid pressure cylinder (lifting means)
36 Centripetal Clamp Mechanism 364 Roller (Clamp Claw)
50 Positioning mechanism 51, 52, 53, 54 Roller

Claims (6)

A band fastening device for a drum can for fastening or loosening a bolt-type band for fixing a canopy to a drum can,
The band is a substantially annular shape in which a ring is partially cut out, a metal fitting is fixed to both ends of the cut out portion, and a bolt for tightening is passed through the metal fitting,
The bolt in the band that is mounted to the canopy arranged in a direction along the horizontal direction, and the bolt chucking mechanism sandwiching moves the pair of chuck jaws unit vertically in a mutual opposing gap of the fitting,
A nut runner with a socket attached to the head of the bolt;
The bolt chucking mechanism and the nut runner are integrally supported, and when the pair of chuck claws sandwich the bolt, the rotation axis of the nut runner is centered in the vertical direction of the opposed gap of the pair of chuck claws. Positioning, a vertically movable support, and
An actuator that moves the support in the horizontal direction so that the pair of chuck claws in the open state approaches the bolt or moves away from the bolt along the radial direction of the bolt;
The bolt is rotated by the nut runner after the socket is engaged with the bolt in a state of being sandwiched in a radial direction in the opposing gap of the metal fitting by the pair of chuck claws ,
A band fastening device for a drum can. A band chuck that forcibly pushes and expands the notched portion of the band, when the band is loosened, moves into the gap between the metal fittings to move away from each other in conjunction with rotation of the bolt by the nut runner. Having nails,
The drum fastening device for a drum according to claim 1. The bolt chucking mechanism has a stopper that contacts the bolt when the support is moved by the actuator and positions the rotary shaft at the center in the horizontal direction of the bolt .
The band fastening device for drums according to claim 1 or 2 . A drum can lid closing machine for fixing a canopy to an open drum can,
Above the drum can whose upper side is open, it has a canopy transport unit that arranges a canopy equipped with a bolt-type band,
The band is a substantially annular shape in which a ring is partially cut out, a metal fitting is fixed to both ends of the cut out portion, and a bolt for tightening is passed through the metal fitting,
In the canopy transport unit,
A positioning mechanism for concentrically positioning the canopy with respect to the drum can by means of a centripetal clamp on the side of the drum can;
Elevating means for lowering the canopy and covering the drum can;
A band fastening device for fastening or loosening the bolt-type band is assembled,
The band fastening device is:
A bolt chucking mechanism that clamps a bolt for tightening in the band mounted on the canopy arranged in a horizontal direction by vertically moving a pair of chuck claw portions in a gap facing each other of the metal fitting. When,
A nut runner with a socket attached to the head of the bolt;
The bolt chucking mechanism and the nut runner are integrally supported, and when the pair of chuck claws sandwich the bolt, the rotation axis of the nut runner is centered in the vertical direction of the opposed gap of the pair of chuck claws. Positioning, a vertically movable support, and
An actuator that moves the support in the horizontal direction so that the pair of chuck claws in the open state approaches the bolt or moves away from the bolt along the radial direction of the bolt;
The bolt is rotated by the nut runner after the socket is engaged with the bolt in a state of being sandwiched in a radial direction in the opposing gap of the metal fitting by the pair of chuck claws ,
A lid closing machine for a drum can. A band chuck that forcibly pushes and expands the notched portion of the band, when the band is loosened, moves into the gap between the metal fittings to move away from each other in conjunction with rotation of the bolt by the nut runner. Having nails,
The lid closing machine for drums according to claim 4. Three or more clamp claws arranged at intervals along an imaginary circle so as to come into contact with the outer periphery of the band attached to the canopy are synchronized with the rotation of the bolt, and the diameter of the imaginary circle is set. The drum can lid closing machine according to claim 4, further comprising a centripetal clamping mechanism that moves in the direction all at once.

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