JPH018264Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a temporary assembly tab bending method used when bending the ends of temporary assembly tabs used for shape retention during temporary assembly of various parts. Regarding equipment.

(Prior Art) FIGS. 6 and 7 show a support grid for a nuclear reactor fuel assembly, which is one of the parts assembled using the above-mentioned temporary assembly tabs.

This support lattice 1 is made up of a large number of band-shaped inner straps 2 arranged in a lattice shape at predetermined intervals and surrounded by band-shaped outer straps 3 arranged in a rectangular shape. Fuel rods 4 inserted into the lattice space formed by ..., 3...
... and the guide tube 5..., respectively.
Two tongue-shaped tabs 6, 6 are formed at both ends of the inner straps 2 of the support grid 1, and on the other hand, the outer straps 3 are provided with tabs 6, 6 at both ends of the inner straps 2. Tab 6 formed in the section
A large number of elongated slits 7, into which the slits 7 are inserted, are formed at corresponding positions. In the support grid 1, the tabs 6 of the inner strap 2 are connected to the slits 7 of the outer strap 3, respectively.
...and is temporarily assembled by slightly bending its upper and lower ends.

By the way, conventionally, when slightly bending the upper and lower ends of the tabs 6, the support grid 1 is placed on a table 9 and a support base 10, which are movably raised and lowered by a hydraulic cylinder 8, as shown in FIG. Pillar 11...
The tabs 6 of the support grid 1 are bent using tab bending pliers 13 after being clamped and fixed between the support grid 1 and the upper fixing plate 12 fixed through the support grid 1. As shown in FIG. 9, the tab bending pliers 13 are located at the upper and lower ends of the tabs 6 of the clamping part 14 that clamps the tabs 6, and protrude in the direction of bending these upper and lower ends. Caulking part 1
5 and 15 are formed, and the upper and lower ends of the clamped tab 6 are pressed by the caulking parts 15 and 15 to bend them at a predetermined angle, respectively. Then, using the tab bending pliers 13, the tabs 6 of the support grid 1 are manually...
I was folding them one by one.

(Problem to be solved by the invention) However, since the above-mentioned conventional bending work of the tabs 6 relies on manual labor, it requires a large amount of man-hours to bend all the tabs 6... Due to worker fatigue over time, etc.
It is difficult to bend all the tabs 6 with uniform force, and as a result, a certain amount of rework is unavoidable, so the work is generally extremely inefficient. Moreover, if the amount of bending of the tabs 6 is excessive, there is a risk of deformation or distortion of the inner straps 3, while if the amount of bending of the tabs 6 is too small, it will not be possible to obtain sufficient temporary assembly strength. There is a problem in that it requires a high level of skill, and an improvement has been desired.

(Purpose of the invention) This invention was made in view of the above circumstances,
By mechanizing the bending work of temporary assembly tabs, a large number of temporary assembly tabs can all be bent with uniform force and angle, improving product quality and greatly reducing labor in this type of work. It is an object of the present invention to provide a tab bending device for temporary assembly that can achieve the following.

(Structure of the invention) The tab bending device for temporary assembly of this invention includes a fixed crimping jig in which a slit into which the central part of the tab is inserted is formed, and a fixed crimping jig provided at each end side of the tab. The movable caulking jig is provided to be movable in the direction of bending the tab, and a driving means is provided for reciprocating the movable caulking jig in the direction of bending the tab, and is provided on one end side of the tab. The movable caulking jig is provided with a protrusion formed with an inclined portion that abuts the end of the tab and bends the tab when it is moved, and the movable caulking jig on the other end side is further provided with a protrusion formed with an inclined portion that abuts the end of the tab and bends the tab when it is moved, and the movable caulking jig on the other end side The tab is provided with a protrusion formed with an inclined portion for bending the tab in the direction of movement opposite to the direction of movement of the crimping jig.

(Example) FIGS. 1 to 5 show an example of the tab bending device for temporary assembly of this invention.

In FIGS. 4 and 5, reference numeral 20 indicates the bed of this temporary assembly tab bending device, and a movable table 21 is provided on the bed 20. As shown in FIG.

The moving table 21 is provided so as to be able to move minutely on the bed 20 by means of a feed shaft 23 whose one end is connected to a stepping motor 22, and a turntable 24 is rotatably provided on the upper surface of the moving table 21. It is being And this turntable 2
4, the support grid 1 sandwiched between the upper plate 25a and the lower plate 25b is placed, and the upper plate 25
An air cylinder 27 for fixation is provided at the upper part of a, via a presser jig 26. This air cylinder 27 is fixed to the tip of a swing arm 28 that is erected on the side of the turntable 24 of the movable base 21, and the support grid 1 is pressed downward by the air cylinder 27, so that the turntable It is fixed on 24. Also, this moving platform 21
A position sensor 29 for detecting the amount of movement of the movable table 21 with respect to the bed 20 is attached to the lower part of the bed 20. A tab bending mechanism 30 is provided on one side of the moving table 21 in the moving direction.

The base of this tab bending mechanism 30 is the bed 2
Integrated pillars 31 and 3 erected on both sides of 0
1 and an upper board 32 horizontally spanned between the upper ends of these supports 31, 31.
The height is approximately the same as the lower part of the support grid 1 above. A fixing caulking jig 33 is provided on the upper surface of the upper substrate 32.

This fixing caulking jig 33 is shown in FIGS. 1 and 2.
As shown in the figure, the plate surface 34 is
It is a plate-like member disposed opposite to the upper support grid 1, and is fixed to a bracket 35 attached to the upper surface of the upper substrate 32 via bolts 36, 36. A groove 37 having a predetermined width and having a U-shaped cross section is formed in the center of the plate surface 34 of the fixed crimping jig 33 in the horizontal direction. Small grooves 38, 38, which are wider than the groove 37, are formed horizontally at the upper and lower portions of the groove 37 on the plate surface 34 at positions spaced apart from the groove 37 by a predetermined equal distance. As a result, band-shaped tab holding portions 39, 39 are formed in the upper and lower portions of the groove portion 37 of the plate surface 34 in the horizontal direction at positions sandwiched between the groove portion 37 and the small groove portions 38, 38. The positions of these band-shaped tab holding parts 39, 39 are set to have the same height as the tabs 6 which are arranged horizontally in two rows upward and downward on the opposing support grid 1 and protrude, and the vertical width thereof is The length is such that it covers the central part of 6 by a predetermined length. The tab holding parts 39, 39 are provided with the tab holding parts 39, 39 at equal pitch intervals with the tabs 6 in the horizontal direction.
A slit 40 that opens in the vertical direction of 39 is formed.

In addition, the groove portion 37 of the fixed caulking jig 33 has
An internally movable caulking jig 41 is inserted so as to be movable in the horizontal direction. This internal movement caulking jig 41
is an elongated plate-like member having a thickness equal to the depth of the groove 37, and at its upper and lower ends protrudes vertically at equal pitch intervals from the tabs 6, respectively, and abuts against the upper and lower wall surfaces of the groove 37. Projections 42... are formed. Further, one end of this internally movable caulking jig 41 is attached to a rod 4 of a hydraulic cylinder (driving means) 43 fixed to the upper surface of the above-mentioned support column 31 on one side.
It is connected to 4. The protrusions 42 of the internally movable caulking jig 41 are formed with inclined portions 45 on the side toward which the hydraulic cylinder 43 advances, as shown in FIG. 3a. Here, the angle of inclination of the inclined portions 45 is made equal to the angle at which one end of the tab 6 inserted between the protrusions 42 is to be bent.

Also, the small groove portions 38, 3 of the fixed caulking jig 33
8, external movable caulking jigs 46, 46, respectively.
is inserted so that it can move freely in the horizontal direction. These external movable caulking jigs 46, 46 are connected to a support 3 that faces the support 31 to which the hydraulic cylinder 43 is fixed.
Hydraulic cylinder (driving means) fixed on the top surface of 1
It is integrally connected to the rod 48 of 47 via a connecting plate 49. The lower end of the external movable caulking jig 46 located above and the upper end of the external movable caulking jig 46 located below are provided with protrusions 42 of the internal movable caulking jig 41, respectively.
A protrusion 50 similar to the above is formed. Furthermore, on the side of the protrusion 50 on which the hydraulic cylinder 47 moves, that is, on the side in the direction of movement opposite to the direction of movement of the internal movement caulking jig 41 as shown by the arrow in FIG. The inclined portions 51 are formed in the same manner as the inclined portions 45 described above. Further, when these rods 44, 48 protrude from the ends of the rods 44, 48 of the hydraulic cylinders 43, 47,
The fixing crimping jig 3 is fixed at each predetermined position.
Stoppers 52 and 53 are fixed to the sides of the rods 44 and 48 to stop the rods 44 and 48 from moving. Further, at the bottom of the bed 20 located below the tab bending mechanism 30, there are three photoelectric elements 54 that detect the approach of the moving table 21 to the tab bending mechanism 30 and control its speed in stages. It is located all over the place.

Next, the operation of the tab bending device for temporary assembly having the above structure will be explained below. First, the stepping motor 22 is driven to move the movable table 21 on which the support grid 1 is attached toward the tab bending mechanism 30 side.
Then, the photoelectric elements 54 provided in three stages detect the approaching moving table 21 and reduce its speed in stages. The movable table 21 is finally positioned at a position where the tabs 6 protruding from one side thereof are inserted into the slits 40 of the tab holding parts 39, 39 provided on the fixed crimping jig 33 of the tab bending mechanism 30. be stopped. Next, the hydraulic cylinders 43 and 47 of the tab bending mechanism 30 are driven to move the internal movable caulking jig 41 and the external movable caulking jig 46 in opposite directions shown by arrows in FIG. At this time, the hydraulic cylinders 43, 4
The movement of the internally movable caulking jig 41 and the externally movable caulking jig 46 is stopped by the stoppers 52 and 53 at the positions where they have been moved by distances L1 and L2 in FIG. 3a, respectively. This results in
The tabs 6 whose central portions are held within the slits 40 are fixed at their upper and lower ends by the protrusions 42 and 50 of the internal caulking jig 41 and the external caulking jig 46 as shown in FIG. 3b. As shown, they are bent in opposite directions. At this time, the upper and lower ends of the tabs 6 are all connected to the protrusions 42, 50.
The inclined portions 45 and 51 formed in the slanted portions 45 and 51 allow the slanted portions 45 and 51 to be bent by a preset angle. In this way, when all the tabs 6 on one side of the support grid 1 have been bent, the hydraulic cylinders 43, 4
7, the internal movable caulking jig 41 and the external movable caulking jig 46 are moved in the opposite direction, and the movable table 21 is also moved in the direction away from the tab bending mechanism 30. Next, the turntable 24 of the moving platform 21 is rotated 90 degrees to bring the new surface of the support grid 1 to face the tab bending mechanism 30, and then starts moving toward the tab bending mechanism 30 again. Then, by repeating the above series of operations,
The tabs 6 on all sides of the support grid 1 are continuously bent.

According to such a tab bending device for temporary assembly, the hydraulic cylinders 43 and 47 are used to bend the tabs 6...
Since the top and bottom ends of the tabs 6 are bent, all tabs 6
...can always be bent with uniform force. Moreover, since the protrusions 42 and 50 of the internal and external movable caulking jigs 41 and 46 for bending the tabs 6 are provided with inclined portions 45 and 51, respectively, the tabs 6 can be bent at a constant angle, and the amount of bending can be avoided excessively. There is no danger of becoming too little or too little. plus tab 6
Since the inclined parts 45 and 51 of the internal and external movable caulking jig for bending both ends of the internal and external movable caulking jig are formed in mutually different movement directions, the internal and external movable caulking jig 45,
The crimping forces acting in both directions from 51 are canceled out, and the tab holding portion 39 of the fixed crimping jig 33
There is no force trying to push it in one direction. As a result, the center portions of the tabs 6 inserted into the tab holding portions 39 are not pressed to one side and bent, and only both ends of the tabs 6 are reliably bent. Also, many tabs 6
Since it is possible to bend ... in one go, it is possible to significantly save labor compared to the conventional method, and it is also possible to automate this type of work.

(Effect of the invention) As explained above, the tab bending device for temporary assembly of this invention includes a fixed crimping jig in which a slit is formed into which the central part of the tab is inserted, and each of the above-mentioned tabs of this fixed crimping jig. a movable caulking jig provided on the end side of the tab so as to be movable in the direction of bending the tab, and a driving means for reciprocating the movable caulking jig in the direction of bending the tab, and The movable caulking jig provided on the end side has a protrusion formed with an inclined portion that abuts the end of the tab and bends the tab when the movable caulking jig is moved. , the protrusion is provided with an inclined portion for bending the tab in the direction of movement opposite to the direction of movement of the one movable crimping jig. Therefore, according to this tab bending device for temporary assembly,
A large number of temporary assembly tabs can all be bent with uniform force and angle.

In addition, it is possible to save labor to a greater extent than in the past, and furthermore, it is possible to automate this type of work.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the tab bending device for temporary assembly of this invention. Figure 1 is a front view of the tab bending mechanism, Figure 2 is a plan view of the same, and Figure 3 is a FIG. 1 is an enlarged view of part A, FIG. 4 is a side view of the entire device, FIG. 5 is a plan view of the same, and FIGS. 6 and 7 are:
This shows a support grid for a nuclear reactor fuel assembly, which is an example of one having tabs for temporary assembly. Fig. 6 is a schematic assembly diagram, Fig. 7 is an enlarged view of the tab, and Figs. 8 and 9 are conventional ones. 8 is a schematic diagram of a support grid fixing jig, and FIG. 9 is a schematic diagram of tab bending pliers. DESCRIPTION OF SYMBOLS 1... Support grid, 6... Tab, 7... Slit, 21... Moving table, 22... Stepping motor, 30... Tab bending mechanism, 33... Fixed caulking jig, 39... Tab holding part , 40...slit,
41...Internal movement caulking jig, 42, 50...Protrusion, 43, 47...Hydraulic cylinder (driving means),
45, 51... Inclined portion, 46... External movable caulking jig, 52, 53... Stopper.

Claims (1)

[Scope of utility model registration request] The end of the part of the tab for temporary assembly that is formed in a flat plate shape on one part and that is inserted into the slit formed in the other part during temporary assembly to maintain the temporarily assembled shape, projects from the slit. A tab bending device for temporary assembly, which comprises: a fixed crimping jig in which a slit is formed into which the central portion of the tab is inserted; and a direction in which the fixed crimping jig is bent toward each end of the tab. a movable caulking jig provided movably on the tab, and a driving means for reciprocating the movable caulking jig in the bending direction of the tab; The movable caulking jig includes a protrusion formed with an inclined portion that abuts the end of the tab and bends the tab when the movable caulking jig is moved, and the movable caulking jig on the other end side 1. A tab bending device for temporary assembly, comprising a protrusion formed with an inclined portion for bending the tab in a direction of movement opposite to the direction of movement of one of the movable crimping jigs.