JPH05154726A - Automatic bolt feeding/fastening device - Google Patents

Abstract

PURPOSE:To permanently fasten a temporarily fastened clamp bolt by fitting a lower mobile fitting body to a support frame with a lift cylinder, and connecting an upper mobile fitting body and the lower mobile fitting body with an operating cylinder vertically moving the upper mobile fitting body against the lower mobile fitting body. CONSTITUTION:When a clamp bolt temporarily fastened to a work is to be permanently fastened, only an upper mobile fitting 37 is lowered by an operating cylinder 45 while a lower mobile fitting body 38 is held above, the fastening rod 48 of a fastening system 43 is penetrated through the chuck head 44 of the lower mobile fitting body 38, and a fastening socket 47 is protruded downward by a holding claw 56. When the lower mobile fitting body 38 is lowered by a lift cylinder 46, the fastening socket 47 protruded from the holding claw 56 is coupled with the head section of the temporarily fastened clamp bolt, and the temporarily fastened clamp bolt is permanently fastened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic bolt supply tightening device, and more particularly, to an automatic supply tightening operation of a tightening bolt, as well as a main tightening operation of a tightening bolt that is already temporarily tightened on a workpiece. The present invention relates to an automatic bolt supply tightening device capable of taking out a jammed bolt without removing a work during automatic bolt supply.

[0002]

2. Description of the Related Art Generally, automatic bolt supply tightening devices are
It is installed at a bolt tightening station on a work transfer line, and a tightening bolt is screwed into a predetermined screw hole of a work that is intermittently stopped at this tightening station to tighten the work.

By the way, as shown in FIG. 6, a conventional automatic bolt supply tightening device has a support frame (2) mounted on a machine base (1).
Is installed upright, and a plurality of guide rails (3) are attached to the vertical side surface of the support frame (2) in parallel and in the vertical direction.
The upper movable mounting body (4) and the lower movable mounting body (5) are vertically movable on the guide rail (3) and vertically mounted at a predetermined interval so that the upper movable mounting body (4).
Is provided with a tightening mechanism (8) having a tightening rod (7) having a bolt tightening socket (6) attached to its tip, and a bolt supply pipe (9) is attached to the lower movable mount (5).
A chuck head (11) having a bolt supply hole to which is connected and having a plurality of grip claws (10) releasably gripping the tightening bolt (a) supplied from the bolt supply hole in a suspending posture. It is installed vertically. The tightening rod (7) of the tightening mechanism (8) is the upper movable mount (4).
Is rotatably driven by a drive unit (12) fixed upright on the upper surface of the chuck head (1) so as to project downward from a fixed cylinder (13) vertically provided on the upper movable mount (4).
1) is pierceable, and in relation to the relative vertical movement of the upper movable mounting body (4) and the lower movable mounting body (5), the tightening socket (6) at the tip of the tightening rod (7) is used. The tightening bolt (a) gripped by the grip claw (10) is pushed downward and screwed into the work (b).

An elevating cylinder (14) is erected and fixed to the upper end surface of the support frame (2), and an elevating rod (15) of the elevating cylinder (14) is attached to a connecting plate (16) horizontally projected on the upper movable mount (4). The upper movable mounting body (4) is vertically moved by connecting and fixing, and the projecting and retracting operation of the elevating rod (15). Further, the connecting rod (17) is erected and fixed to the lower movable mounting body (5), and the upper end screw part of the connecting rod (17) is loosely inserted into the through hole formed in the predetermined portion of the upper movable mounting body (4). Also, the nut (18) is screwed onto the upper end screw part, and the retaining ring (19) is interposed between the nut (18) and the upper movable mounting body (4) to move the connecting rod (17) upward. The lower movable mounting body (5) is suspended from the upper movable mounting body (4) by connecting to the mounting body (4). A compression spring (2) is attached to the connecting rod (17) between the upper movable mounting body (4) and the lower movable mounting body (5).
0) is wound and contracted, and the lower movable attachment body (5) is always urged downward by the spring force. A stopper (21) is attached and fixed to the lower end of the support frame (2), and the lower end position of the lower movable mounting body (5) is determined by this stopper (21).

Thus, when the tightening bolt (a) is automatically supplied to the desired screw hole of the work (b) by screwing and tightening, the tightening bolt (a) is pneumatically supplied through the supply pipe (9). To the chuck head (11). Then, the tightening bolt (a) is releasably gripped by the gripping claw (10) of the chuck head (11) in a hanging posture. Then, the elevating rod (15) of the elevating cylinder (14) projects, and the upper movable mount (4) descends along the guide rail (3). Due to the lowering of the upper movable mounting body (4), the lower movable mounting body (5) suspended from the upper movable mounting body (4) also descends until it comes into contact with the stopper (21) and is positioned and stopped at the lowering end. To do. Lower movable mount (5)
Even after the stop, the upper movable mount (4) remains
The protrusion 5) causes the compression spring 20 to move downward against the biasing force of the spring 20. Due to the lowering of the upper movable mount (4), the tightening socket (6) and the tightening rod (7) of the tightening mechanism (8) protrude through the chuck head (11) of the lower movable mount (5) to grip it. The tightening bolt (a) held by the claw (10) is pushed downward. Then, the tightening socket (6) is rotated by the driving force of the drive unit (12), and the tightening bolt (a) is screwed into a desired screw hole of the work (b).

[0006]

As described above, in the conventional automatic bolt supply tightening device, the tightening socket (6) is attached to the chuck head (11) only after the lower movable mounting body (5) is held at the lower end. ) It is not possible to project the lower part through, so if the tightening bolt (a) temporarily tightened in advance on the work (b) is to be fully tightened, when the lower movable mounting body (5) is located at the descending end, Closed gripping claw (1
0) hits the tightening bolt (a) temporarily tightened on the work (b) and cannot be opened, and as a result, the tightening socket (6) of the tightening mechanism (8) is held by the grip claw (1).
0) does not project downward, and the tightening bolt (a) cannot be fully tightened. In short, the temporarily tightened tightening bolt cannot be used as a device for final tightening.

Further, when the tightening bolts are automatically supplied, the work (b) exists on the transfer line below the chuck head (11).
When the tightening bolt (a) is clogged inside 1) and the tightening bolt (a) is pushed out from the chuck head (11) by the tightening socket (6), the work ( b) becomes a hindrance, and the tightened tightening bolt (a) cannot be pushed out by the tightening socket (6) to be taken out from the inside of the chuck head (11). Therefore, the above-mentioned tightened tightening bolt (a) cannot be taken out. In order to take out the work from the chuck head (11), the work (b) must be removed from the transfer line to form a space below the chuck head (11). There was a problem that it was extremely complicated and the workability was extremely poor.

The present invention has been proposed in view of the above problems, and it is possible to perform not only the automatic supply tightening operation of the tightening bolts but also the final tightening operation of the tightening bolts that are already temporarily tightened on the work, and An object of the present invention is to provide an automatic bolt supply tightening device that can easily take out a jammed bolt without removing a work when the tightening bolt is automatically supplied.

[0009]

The present invention achieves the above objects.
To support the upper and lower movable mounts.
It can be moved vertically along the holding frame, and it can be moved up and down in two steps for a predetermined period.
The drive force of the drive unit is placed on the upper movable mounting body with a space.
Is tightened at the tip of the tightening rod that is driven to rotate by
A tightening mechanism equipped with a
Insert a through hole into the mounting body where the tightening rod is inserted.
Tightening bolt supply hole that has and merges with this insertion hole
And the tightening bolt supplied from the supply hole can be releasably suspended.
Hold the chuck head with gripping claws
Mounting, vertical movement of upper movable mount and lower movable mount
In relation to
Automatic bolt supply tightening that allows the tightening bolt to be pushed downward
In the attachment device,

An elevating cylinder for raising and lowering the lower movable mounting body is mounted on the support frame, and the upper movable mounting body and the lower movable mounting body are vertically moved with respect to the lower movable mounting body. It is connected by an operating cylinder.

[0011]

When the tightening bolt that has already been temporarily tightened to the work is to be fully tightened, the operating cylinder lowers only the upper movable mounting body while holding the lower movable mounting body upward, and the tightening rod of the tightening mechanism is removed. After passing through the chuck head of the lower movable mounting plate to project the tightening socket below the gripping claw, lowering the lower movable mounting body by the lifting cylinder, the tightening socket protruding from the gripping claw was temporarily tightened. It is possible to fit the head of the tightening bolt and finally tighten the temporarily tightened tightening bolt.

When the jammed tightening bolt is taken out from the chuck head during the automatic tightening operation of the tightening bolt, the lower movable mounting body is held upward,
When only the upper movable mounting body is lowered by the operating cylinder, the tightening bolt that is stuck inside the chuck head is pressed by the tightening socket at the tip of the tightening rod, and the gripping claw is pushed open to push downward.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of embodiments of the apparatus according to the present invention, with reference to FIGS.

As shown in FIGS. 1 to 5, the machine base (31)
The machine frame (32) is erected on the upper side, and the support frame (33) is fixed to the upper end of the machine frame (32). A plurality of guide rails (35) are provided on the outer surface of the vertical side wall (34) of the support frame (33).
(35) is attached in parallel and vertically, and the side wall (3
4) A window hole (36) is formed at a predetermined portion between the guide rails (35) (35). The guide rails (35) (3
An upper movable mounting body (37) and a lower movable mounting body (38) are attached to 5) via a guide member (39) so as to be vertically movable. The lower movable mounting body (38) includes a body (4) provided with a mounting portion (41) at a rear end portion of the mounting plate portion (40a).
0) and a mounting piece (42) having an L-shaped cross section fixed to the rear wall portion (40b) of the main body (40), and the mounting piece (42) is a window of the support frame (33). It projects into the support frame through the hole (36).

(43) is a tightening mechanism arranged at the front end of the mounting plate portion (37a) of the upper movable mounting body (37), and (4)
4) is a chuck head mounted on the mounting plate portion (40a) of the lower movable mounting body (38) immediately below the tightening mechanism (43), and (45) is the upper movable mounting body (37) connected to the lower movable mounting body (38). ), An operating cylinder for vertically moving the lower movable mounting body (38) is vertically moved.

The tightening mechanism (43) is a tightening socket for bolt tightening at the lower end of a tightening rod (48) which is rotationally driven in a predetermined direction by a drive section (49) fixed to the upper movable mount (37). (47) is provided. The tightening rod (48) is made to project downward from a fixed cylinder (50) vertically provided on the upper movable mounting body (37), and a flange portion (51) and a fixed cylinder (50) formed at an intermediate portion of the clamp rod (48). A compression spring (52) is interposed between the lower end portion and the lower end portion and is constantly urged downward.

The chuck head (44) has a mounting plate portion (40a) of the lower movable mounting body (38) in which a notch portion (53) is formed at circumferentially equidistant positions on the outer peripheral surface of the lower end portion of the mounting cylinder (5).
4) is vertically installed, and a gripping claw (56) is pivotally attached to the notch (53) of the mounting cylinder (54) through a pivoting pin (55) so that the gripping claw (56) can be opened and closed. Has a through hole (57) through which the tightening rod (48) is inserted so as to be concentric with the tightening rod (48). A cutout recess (59) opening to the insertion hole (57) is formed on the inclined side surface of the protruding portion (58) protruding laterally of the mounting cylinder (54), and a bolt supply hole is formed in the cutout recess (59). A supply cylinder (61) having (60) is pivotally mounted via a pivot shaft (62) so that the bolt supply hole (60) communicates with and merges with the insertion hole (57).

The supply cylinder (61) is always urged in the clockwise direction in FIG. 5 by an elastic body, and the tightening rod (4)
8), the bolt supply hole (60) is inserted into the insertion hole (5).
7), when the tightening rod (48) descends, it is pressed by the tightening socket (47) and rotates about the pivot (62) as a fulcrum against the urging force of the elastic body in the counterclockwise direction as shown by the chain line. Move away. Overhang (5) of the mounting cylinder (54)
8) Supply pipe (64) on the upper end surface through a connecting cylinder (63)
And the supply pipe (64) is connected to the bolt supply hole (60) of the supply cylinder (61) through the opening (65), and is tightened by air pressure from the supply pipe (64). The bolt (a) is inserted from the supply cylinder (61) into the insertion hole (57).
Then, it is drooped and gripped by the gripping claws (56) in a suspending posture.

A recess (66) is formed on the inner surface of the upper end of the grip claw (56), and the spring (67) housed in the recess (66) is brought into contact with the lower end of the mounting cylinder (54). hand,
The grip claw (56) is always biased in the closing direction. The gripping claw (56) has a screw hole penetrating in the radial direction, and an adjusting screw (68) is inserted through the screw hole so that the tip end surface of the gripping claw (56) contacts the inner surface of the notch (53). The gripping claws (56) by making contact with each other and adjusting the inward protrusion amount of the adjusting screw.
Adjust the expansion amount of.

The working cylinder (45) is vertically fixed to the rear end of the mounting plate portion (37a) of the upper movable mounting body (37), and the working rod (70) of the working cylinder (45) is It penetrates through the mounting plate portion (37a) and projects downward, and is connected and fixed to the rear mounting portion (41) of the main body (40) of the lower movable mounting body (38) via the connecting member (71). The upper movable mount (37) is vertically moved with respect to the lower movable mount (38) by the retracting and projecting operation of the operating rod (70), and the tightening rod (48).
Is slid in the insertion hole (57) of the chuck head (44) so that the tightening socket (47) projects downward from the gripping claw (56).

The lifting cylinder (46) is provided with a support frame (3
3) Standingly fixed to the upper wall portion (72). The lifting rod (73) of the lifting cylinder (46) has an upper wall portion (72).
The lower movable mount (38) is connected and fixed to the upper surface of the tip of the mounting piece (42) of the lower movable mount (38) via the connector (74). The guide rail (35) is caused by the protrusion / retraction operation of (73).
Move vertically along (35). Reference numeral (75) is an engaging projection fixed to the lower end of the rear wall portion (40b) of the lower movable mounting body (38), and (76) is a stopper fixed to the lower end portion of the side surface of the support frame (33). , Lower movable mount (38)
The engaging projection (75) hits the lower movable attachment body (38) at the descending end when it is lowered.

2 and 3, reference numeral (77) is a work holding rod rectangularly arranged on the lower surface of the mounting plate portion (40a) of the lower movable mounting body (38), and (78) is a positioning pin. .

The operation of the automatic bolt supply tightening device according to the present invention will be described below. The upper movable mounting body and the lower movable mounting body are located above, and
The tightening rod of the tightening mechanism is held above the through hole of the chuck head, and the bolt supply hole of the supply cylinder communicates with the lower end of the through hole of the mounting cylinder.

When the tightening bolts are automatically supplied to the work and tightened, the tightening bolts (a) are supplied by air pressure.
Is pressure-fed to the supply cylinder (61) through the supply pipe (64).
Then, since the bolt supply hole (60) of the supply cylinder (61) communicates with the insertion hole (57) of the mounting cylinder (54), the tightening bolt (a) is inserted from the supply cylinder (61) into the insertion hole (57). After being sent to the lower end of the grip, as shown in FIG.
The head (c) is locked to the tip of 6) and is gripped in a hanging posture. When the lifting rod (73) of the lifting cylinder (46) is projected in this state, the upper movable mounting body (37)
And the lower movable mounting body (38) descend along the guide rails (35) and (35) while maintaining the relational positions in FIG. 1 until the engaging projections (75) come into contact with the stoppers (76),
The gripping claws (56) of the chuck head (44) are located at a position near and above the work (b).

Then, the working rod (70) of the working cylinder (45) is retracted. Then the lower movable mount (3
Since 8) is positioned and held in the lower fixed position by the lifting cylinder (46), a pulling force acts on the upper movable mounting body (37), and as a result, the upper movable mounting body (37) is guided by the guide rail (35). ) (35), and the tightening rod (48) moves into the insertion hole (57) of the chuck head (44).
Then, the supply cylinder (61) is pushed downward by the tightening socket (47) to rotate in the counterclockwise direction around the pivot (62) against the biasing force of the elastic body. Evacuate,
The tightening socket (47) is fitted to the head (c) of the tightening bolt (a) held by the grip claw (56). When the operating rod (70) of the operating rod (70) is further lowered after the tightening socket (47) is fitted into the tightening bolt (a), the tightening bolt (a) causes the gripping claw (5) to move.
While pushing 6) open, it projects downward from the gripping claw (56) and is inserted into the screw hole of the work (b). At this time, the tightening socket (47) projects downward from the grip claw (56). Then, the drive unit (49) of the tightening mechanism (43).
Is driven, the tightening rod (48) and the tightening socket (47) rotate in a predetermined direction, and the tightening bolt (a) is tightened.

When the tightening of the tightening socket (47) is completed in this way, the lifting rod (7) of the lifting cylinder (46) is
3) retracts, and the lower movable mounting body (38) vertically moves upward along the guide rails (35) and (35) and is held in the upper fixed position. At this time, since the upper movable mounting body (37) is connected to the lower movable mounting body (38) via the operating rod (70) of the operating cylinder (45), the upper movable mounting body (37) also rises. .. At the same time, the actuating rod (70) of the actuating cylinder (45) projects and the upper movable mount (37) vertically moves upward along the guide rails (35) (35) to move the lower movable mount (38). And the tightening socket (47) is separated from the chuck head (44).
Is held above the insertion hole (57). Then, as shown in FIG. 5, the supply cylinder (61) rotates clockwise around the pivot (62) as a fulcrum by the urging force of the elastic body, and the insertion hole (5
7) is closed by the supply cylinder (61), the bolt supply hole (60) of the supply cylinder (61) communicates with the insertion hole (57), and the next tightening bolt (a) is connected to the grip claw (56). Sent. Further, the work (b) is conveyed by an appropriate conveying means, a screw hole into which the bolt is not screwed is located immediately below the chuck head (44), and the tightening bolt (a) is screwed into the screw hole in the same manner as above. Is inserted.

Next, when the tightening bolt (a) temporarily tightened on the work (b) is finally tightened, the automatic supply of the tightening bolt (a) from the supply pipe (64) is stopped. Then, when the tightening bolt (a) temporarily tightened on the work (b) is located immediately below the chuck head (44), the working rod (70) of the working cylinder (45) first retracts. Then, since the lower movable mounting body (38) is positioned and held in the upper fixed position by the elevating cylinder (46), a pulling force acts on the upper movable mounting body (37), and as a result, the upper movable mounting body (37). ) Descends along the guide rails (35) (35), and the tightening rod (48) moves toward the chuck head (4).
4) is moved downward in the insertion hole (57) and the supply cylinder (6
1) is pressed by the tightening socket (47) and the pivot (6
It rotates counterclockwise as shown in FIG. 5 against the biasing force of the elastic body about 2). When the working rod (70) of the working cylinder (45) further retracts, the tightening socket (4)
7) pushes the gripping claw (56) open and holds the gripping claw (5
6) Projected downward.

When the tightening socket (47) projects downward from the gripping claws (56) of the chuck head (44),
The lifting rod (73) of the lifting cylinder (46) projects,
Thereafter, while maintaining the above state, the lower movable mounting body (38) descends along the guide rails (35) (35) until the engaging projection (75) contacts the stopper (76), and is positioned and held at the descending end. It When the lower movable mounting body (38) is held at the lower end, the gripping claws (56) of the chuck head (44) are held.
The tightening socket (47) protruding further downward is the head (c) of the tightening bolt (a) temporarily tightened on the work (b).
To fit. Then, when the drive unit (49) is driven, the tightening socket (47) rotates, and the temporarily tightened tightening bolt (a) is finally tightened. When the tightening bolt (a) temporarily tightened in this way is finally tightened, the lifting rod (73) of the lifting cylinder (46) retracts, and the lower movable mounting body (38) is attached to the guide rails (35) (35). It then moves vertically upwards and is held in a fixed upper position. At this time, the tightening socket (47) of the tightening mechanism (43) is held on standby while protruding downward from the grip claw (56). The tightening bolts (a) temporarily tightened on the work (b) are then fully tightened in the same manner.

Further, when the tightening bolt (a) is clogged near the lower end of the insertion hole (57) of the chuck head (44) during the automatic supply tightening operation of the tightening bolt (a), the lower movable mounting body (38). ) In the upper home position. That is, a space is formed between the lower movable mounting body (38) and the work (b). At this time, tightening socket (47)
Is located above the insertion hole (57) of the chuck head (44), and the bolt supply hole (60) of the supply cylinder (61) communicates with the lower portion of the insertion hole (57). ) Is closed by the supply cylinder (61).

In this state, when the operating rod (70) of the operating cylinder (45) withdraws, the lower movable mount (3)
Since 8) is positioned and held in a fixed position, a pulling force acts on the upper movable mounting body (37), and as a result, only the upper movable mounting body (37) moves along the guide rails (35) (35). Down, the tightening rod (48) moves downward in the insertion hole (57) of the chuck head (44), the supply cylinder (61) is pressed by the tightening socket (47), and the pivot shaft (62) is centered. Further, it rotates counterclockwise as shown in FIG. 5 against the biasing force of the elastic body. When the working rod (70) of the working cylinder (45) is further retracted, the insertion hole (57) is inserted.
The tightening bolt (a) clogged at the lower end of the is pressed by the tightening socket (47), and the pressing force pushes the gripping claw (56) open from the lower end of the insertion hole (57) and is discharged to the outside. .. In this manner, with the lower movable mounting body (38) held in the upper fixed position, the tightening socket (47) of the tightening mechanism (43) can be made to project below the gripping claws (56) of the chuck head (44). As a result, unlike the conventional case, the tightening bolt (a) stuck in the chuck head (44) can be discharged to the outside without removing the work (b) from the work transfer line.

[0031]

According to the present invention, not only can the tightening bolts be automatically supplied to tighten the tightening bolts on the workpiece, but also the tightening bolts temporarily preliminarily tightened on the workpiece can be fully tightened. If the chuck head is clogged with the tightening bolt during the automatic tightening operation of the tightening bolt, the tightening bolt should be securely removed from the chuck head without removing the workpiece from the transfer line.
At the same time, it can be discharged quickly, which greatly improves workability. Moreover, the structure is simple, the manufacturing is easy, and the cost is low.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view showing an embodiment of a device of the present invention.

FIG. 2 is a schematic side view of the device of the present invention.

3 is a schematic front view of FIG.

FIG. 4 is an enlarged cross-sectional view of a main part of FIG.

5 is an enlarged cross-sectional view of a main part of FIG.

FIG. 6 is a schematic explanatory view of a conventional automatic bolt supply tightening device.

[Explanation of symbols]

 33 Support Frame 37 Upper Movable Mount 38 Lower Movable Mount 43 Tightening Mechanism 44 Chuck Head 45 Actuating Cylinder 46 Elevating Cylinder 47 Tightening Socket 48 Tightening Rod 49 Drive Part 56 Grip Claw 57 Insertion Hole 60 Bolt Supply Hole

Claims (1)

[Claims] 1. An upper movable mounting body and a lower movable mounting body,
It is vertically movable along the support frame, and it is arranged in two steps vertically with a predetermined interval, and the upper movable mount has a tightening socket attached to the tip of the tightening rod that is driven to rotate by the driving force of the drive unit. With the tightening mechanism, the lower movable mounting body has an insertion hole through which the tightening rod is inserted, and the tightening bolt is supplied to the tightening bolt supply hole and the supply hole. Attach a chuck head that has a gripping claw that releasably grips in a holding posture, and in connection with the vertical movement of the upper movable mounting body and the lower movable mounting body, tighten the tightening bolt gripped by the gripping claw with the above-mentioned tightening socket. In an automatic bolt supply tightening device that can be pushed downward, an elevating cylinder that moves the lower movable mounting body up and down is attached to the support frame, and an upper movable mounting body and a lower movable mounting body are installed. A mounting member, the automatic volt supply tightening device, characterized in that linked with hydraulic cylinder for vertically moving the upper movable attachment member with respect to the lower movable mounting member.