JPH0451966Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention is an automatic grinding of temporary assembly tabs used to maintain the shape during temporary assembly of various parts, for removing them after assembly. Regarding equipment.

[Prior Art] Figs. 4 and 5 show a support grid product 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. Strap 2..., 3
The fuel rods 4 and the guide tubes 5 inserted into the lattice spaces formed by the lattice spaces are supported respectively. The inner strap 2 of this support grid 1...
Two tongue-shaped tabs 6, 6 are formed at both ends, and tabs 6 are formed at both ends of the inner strap 2 on the outer strap 3. A large number of elongated cutouts 7 are formed into which the cutouts 7 are respectively inserted. The support grid 1 is connected to the tabs 6 of the inner strap 2...
. . . are the cutout portions 7 of the outer strap 3, respectively.
It is temporarily assembled by inserting it inside and bending it slightly.

By the way, the support grid 1 temporarily assembled in this way is then spot-welded at each corner of the outer straps 3, and then each of the inner and outer straps 2...
All intersections of ..., 3... are brazed to each other to complete the assembly. Therefore, in this support grid 1, after the above-mentioned assembly is completed, the above-mentioned temporary assembly tabs 6... are not required, so these temporary assembly tabs 6... are not required before sending this support grid 1 to post-processes such as heat treatment. Tab 6... needs to be removed. For this reason, conventionally, after the tabs 6 have been temporarily assembled, they are first roughly ground with a belt grinder, and then the remaining parts protruding from the surface of the outer strap 3 are polished by hand using a grinder until they are approximately flush with each other. The polishing had been removed by the work.

[Problems to be solved by the invention] However, in the conventional process of grinding and removing tabs for temporary assembly, the rough grinding using the belt grinder and the finishing grinding using the grinder are performed independently. Therefore, the work of transporting the support grid 1 to each grinding device and fixing it during grinding is highly dependent on manual work, which is inefficient overall, and especially during rough grinding using the grinding belt. The movement of the above-mentioned support grid 1 relies on manual labor.
If the outer strap 3 is ground too much by mistake, there is a risk that the surface of the outer strap 3 will be damaged by the grinding belt, so the amount of grinding tends to decrease. As a result, there is a problem in that the amount of manual grinding that is the final step increases, resulting in a large increase in the number of man-hours.

[Purpose of the invention] This invention was made in view of the above circumstances, and aims to automate the rough grinding of the temporary assembly tab using a belt grinder and the finish grinding using a grinding wheel, and also to control the amount of grinding in each grinding process. It is an object of the present invention to provide an automatic tab grinding device for temporary assembly that can achieve comprehensive labor savings in this type of grinding work.

[Structure of the invention] The automatic tab grinding device for temporary assembly of this invention is provided with a movable table on the bed, on which the product is mounted on the upper surface, movably by a drive means, and on one side of the bed, the movable table is provided. A belt grinding mechanism is provided for rough grinding the tabs protruding from the surface of the product mounted on the table, and a grinding wheel grinding mechanism is provided on the other side of the bed for finishing grinding the tabs after the rough grinding. A movable table drive control means for controlling the amount of rough grinding of the tab by controlling the amount of movement of the movable table toward the belt grinding mechanism, and supporting the grinding wheel of the grinding wheel grinding mechanism. a movable base and its driving source for moving the grinding wheel toward the tab side of the product surface, and controlling the amount of grinding of the tab by controlling the amount of movement of the grinding wheel of the grinding wheel grinding mechanism toward the tab side. The grinding control means is provided on the bed so as to be able to come into contact with and separate from the surface of the product at a height different from the tab position of the product. a first sensor that detects the surface position of the grinding wheel; a second sensor that is provided on the bed or the movable base and detects the position of the grinding wheel; and a second sensor that detects the position of the grinding wheel by bringing the first sensor and the grinding wheel into contact with each other. a first sensor and a reference part for setting a reference position of the grinding wheel; the surface position of the product from the reference part detected by the first sensor;
The grinding amount of the tab on the surface of the product is set based on the position of the grinding wheel from the reference portion detected by the second sensor.

[Example] Figures 1 to 3 show an example of an automatic tab grinding device for temporary assembly (hereinafter abbreviated as the grinding device) of this invention.

In FIGS. 1 and 2, this grinding device includes a movable table 11 mounted with the support grid 1 and movably provided on the bed 10, and a belt provided on one side of the bed 10. Grinding mechanism 12
, a grinding wheel grinding mechanism 13 provided on the other side of the bed 10, and a moving table drive control means 14 and a grinding control means 15 that respectively control the moving table 11 and the grinding wheel grinding mechanism 13. It is what was done.

The moving table 11 is provided so that it can be moved by a minute amount on the bed 10 by a feed shaft 17 whose one end is connected to a stepping motor (driving means) 16. A turntable 18 is rotatably provided on the moving table 11, and the support grid 1 sandwiched between an upper plate 19a and a lower plate 19b is placed on the turntable 18. ing. And the upper plate 19a
An air cylinder 21 for fixing is provided on the upper part of the holding jig 20 via a holding jig 20. This air cylinder 21 is connected to the turntable 1 of the moving table 11.
The air cylinder 21 presses the support grid 1 downward and fixes it on the turntable 18. Further, at the bottom of this moving table 11, there is a position sensor 23 for detecting the amount of movement of this moving table 11 with respect to the bed 10.
is installed. A base 24 of the belt grinding mechanism 12 is fixed on the bed 10 on one side of the moving table 11 in the moving direction.

A large-diameter driving belt pulley 25 is provided below the base 24 of the belt grinding mechanism 12 so as to be rotatable by a shaft 26 and an electric motor 27 connected to one end of the shaft. Further, at the upper end of this base 24, a small diameter guide belt pulley 28 is rotatably supported via a shaft 29. A belt grindstone 30 is wound between the drive belt sheave 25 and the guide belt sheave 28 with its grinding surface facing the tabs 6 of the support grid 1. Further, side plates 31, 31 are provided upright on both sides of the belt grindstone 30 of the base 24, and a belt pressing means 32 is spanned between these side plates 31, 31.

As shown in FIG. 3, in this belt pressing means 32, a pressing shaft 35 is inserted through a bearing 36 so as to be vertically movable between lower openings 34 of support plates 33 disposed opposite to each other on the side plates 31, 31. On the other hand, a drive shaft 37 is rotatably spanned between the upper parts of the support plate 33, and these press shafts 35 and drive shafts 3
7 and the respective ends thereof are connected to each other via a crank mechanism 38. Here, the pressing shaft 35 is provided so as to protrude from the back surface of the belt grindstone 30 toward the tab 6 that is to be ground. Further, one end of the drive shaft 37 is connected to an induction motor 39 fixed to the side plate 31 of the base 24. As a result, when the drive shaft 37 is rotated by the induction motor 39, the pressing shaft 35 moves up and down within the opening 34 with the belt grindstone 30 locally protruding through the crank mechanism 38. It is designed to move back and forth in the direction.

Further, at the bottom of the bed 10 located below the belt grinding mechanism 12, the belt grinding mechanism 1
2, the position of the movable table 11 moving toward the tab 6 of the support grid 1 on the movable table 11 is detected.
A photoelectric element 40 is attached that reduces the speed of the moving table 11 in stages as rough grinding progresses, and stops the stepping motor 16 at a preset position where the rough grinding by the belt grinding mechanism 12 ends. ing. The photoelectric element 40 and the position sensor 23 constitute the movable table drive control means 14 for controlling the movement of the movable table 11. Further, the grinding wheel grinding mechanism 13 is provided on the other side of the bed 10.

A bed 41 of this grinding wheel grinding mechanism 13 is provided in a direction perpendicular to the bed 10 of the movable table 11, and a base (a movable base) is mounted on the bed 41.
42 is provided so as to be movable forward and backward toward the bed 10 by a stepping motor (drive source) 42a. A support 43 is erected on the upper surface of the base 42 on the side of the bed 10, and a rotary shaft 44 is rotatably held inside the support 43. At the upper end of the rotating shaft 44 protruding from the support 43,
A large-diameter disc-shaped grinding wheel 45 is mounted horizontally on the movable table 11 so as to be at the same height as the support grid 1. Moreover, on the upper part of the pillar 43,
A protective cover 46 covering the grinding wheel 45 is attached. Furthermore, a mounting base 4 is attached to the support column 43.
7, a dresser 48 for the grinding wheel 45 is provided so as to be movable in the vertical direction and in the feeding direction by a vertical feed handle 49 and a feed handle 50, respectively. A motor 5 for driving the grinding wheel 45 is mounted on the upper surface of the base 42 in line with the support 43.
1 is fixed with its output shaft facing downward, and the output shaft of this motor 51 and the lower end of the rotating shaft 44 are connected to each other within the base 42.
The base 42 also has a bed 4 of the base 42.
A position sensor 52 is provided to measure the position of the grinding wheel 45 by detecting the amount of movement relative to the grinding wheel 45 . On the other hand, the bed 1 of the grinding wheel grinding mechanism 13
A support stand 53 is erected on the center side, and the grinding control means 15 is provided on this support stand 53.

This grinding control means 15 includes two sets of sensors (first sensors) 54 and 54 provided on the support table 53 and for detecting the surface position of the outer strap 3 of the support grid 1 on the movable table 11. , these sensors 5
4 and 54 integrally moving back and forth with respect to the support grid 1; and the position sensor 52.
(second sensor). Here, the mounting height of the two sets of sensors 54, 54 is as follows:
As shown by two-dot chain lines in FIG. 5, the heights are such that they face the upper and lower surfaces of the outer strap 3, which sandwich the tabs 6, 6 therebetween. The distance between these sensors 54, 54 is adjusted as appropriate by an air cylinder 56 for adjusting the distance for each standard of the support grid to be ground. Further, the sensors 54, 5 are mounted on the side of the rotating arm 22 of the movable table 11 at the same height as the sensors 54, 54.
A monitor strap (reference part) 57 for setting the reference point of No. 4 is arranged opposite to the monitor strap. and,
The grinding device having the above configuration is installed in a dust-proof duct-equipped hood case (not shown).

Next, the operation of the above-mentioned grinding device will be explained below.
First, after turning on the main switch of the operation panel (not shown) of the grinding device provided outside the hood case, the standard of the support grid 1 to be ground is designated by the switch on the operation panel. As a result, the interval between the two sets of sensors 54, 54 for detecting the surface position of the outer strap 3 of the support grid 1 is set to the interval specified by the air cylinder 56. Next, after placing the support grid 1 held between the upper and lower plates 19a and 19b on the turntable 18 on the movable table 11, the turntable 18 is held down by the holding jig 20 and the air cylinder 21.
Fix it on top. Next, after closing the door of the food case, the automatic operation switch of the belt grinding mechanism 12 on the operation panel is turned on. Then, the electric motor 27 and induction motor 39 of the belt grinding mechanism 12 are activated, and the belt grindstone 30 is rotated between the driving belt sheave 25 and the guiding belt sheave 28, and the pressing shaft 35 of the belt pressing means 32 is rotated. While the belt grindstone 30 is pressed against the tabs 6 of the support grid 1, it repeats reciprocating motion in the vertical direction. Meanwhile, in this state, the moving table 11 starts moving toward the belt grinding mechanism 12 by the stepping motor 16 and the feed shaft 17. As the movable table 11 approaches the belt grinding mechanism 12, the tabs 6 protruding from the support grid 1 on the movable table 11 are protruded by the pressing shaft 35 of the belt grindstone 30 and moved up and down. Gradually, it is roughly ground. At this time, the moving speed of the moving table 11 is gradually reduced by the position sensor 23 and the photoelectric element 40 as the rough grinding progresses. Then, the movable table 11 once stops at a position where rough grinding of the tabs 6 by a preset amount has been completed, and then returns to the center of the bed 10 again. And in this position turntable 1
8 is rotated 90 degrees, and the surface of the support grid 1 adjacent to the surface on which the rough grinding has been completed is directed toward the belt grinding mechanism 12. Then, the movable table 11 moves again to the belt grinding mechanism 12 side, and the tabs 6 on the second surface of the support grid 1 are roughly ground in the same way. When the above operations are repeated and the rough grinding of the tabs 6 on all sides of the support grid 1 is completed, the movable table 11 returns to the central position of the bed 10 and the belt grinding mechanism 12 automatically operates. stops.

Next, the grinding wheel 45 and the sensors 54, 54
At the position where both of the grinding wheels are retracted from the bed 10, the movable table 11 is manually moved toward the grinding wheel grinding mechanism 13, and the monitor strap 57 is positioned on the center line of the grinding wheel 45. Then, similarly, the grinding wheel 45 is manually moved toward the monitor strap 57, and the reading of the position sensor 52 is reset to 0 at the position where the grinding wheel 45 and the monitor strap 57 come into contact. Next, move the moving table 11 to attach the monitor strap 57 to the sensors 54 and 5.
Adjust to measurement position 4. and air cylinder 5
5 causes the sensors 54, 54 to protrude toward the monitor strap 57, and the measured value of the monitor strap 57 is reset to the reference value of 0. As a result, the position sensor 52 of the grinding wheel 45
The reference points of the reading by the sensor 54 and the reading by the sensors 54, 54 coincide with each other. In this state, the automatic operation switch of the grinding wheel grinding mechanism 13 on the operation panel is turned on. Then, the motor 51 rotates the grinding wheel 45, and the movable table 11 moves on the bed 10 toward the grinding wheel grinding mechanism 13. Then, the moving table 11
With the movement of the support grid 1, the sensors 54, 5
4, these sensors 54,5
4 are moved towards the support grid 1 by the air cylinder 55 and brought into contact with the upper and lower surfaces of the outer strap 3.

Further, when the support grid 1 is moved from this state, when the respective sensors 54, 54 are positioned above and below the first tabs 6, 6, the outer laps at the top and bottom of the tabs 6, 6 are moved. The position of the surface of No. 3 is detected.

Here, among the measured values of both sensors 54, 54, a correction value that takes a predetermined safety amount into the measured value of the one protruding toward the sensor 54, 54 side is stored as the amount of grinding by the grinding wheel 45. .

Further, the above-described grinding amount detection and storage operation are performed sequentially for each tab 6, 6 that is spaced apart in the movement direction of the support grid 1 by movement of the support grid 1.

Then, by moving the support grid 1 again, the first tabs 6, 6 are brought into alignment on the center line in the moving direction of the grinding wheel 45, and the tabs 6, 6 which are brought into alignment as described above are Based on the stored information on the amount of grinding, the grinding wheel 45 is moved toward the tabs 6, 6 to grind the tabs 6, 6, and the grinding wheel 45 finishes grinding the predetermined amount. After that, it is temporarily retreated, and the respective tabs 6, 6 are subsequently ground in the same manner.

The amount of movement of the grinding wheel 45 is detected by the position sensor 52, and is controlled by comparing the detection result with the amount of grinding set based on information from the sensors 54, 54. .

Here, the sensor 5 for setting the above-mentioned cutting amount
4 and the reference point for cutting with the grinding wheel 45 are set by the sensor 54 and the contact with the same monitor strap 57 as the grinding wheel 45. The points are made to coincide with each other with high precision, and the position sensor 52 detects the amount of movement of the grinding wheel 45 from the reference point, and control is performed by comparing it with the set amount of grinding. The amount of grinding is controlled with high precision to prevent damage to the outer strap 3. The grinding wheel 45 is connected to the movable table 11.
moves again to position the second tabs 6, 6 at the above-mentioned grinding position and then stops, performs finish grinding of the memorized amount on the second tabs 6, 6 in the same way, and retreats again. In this way, the above series of operations is repeated for each tab 6, 6, and when the finish grinding of all the tabs 6 on one side of the support grid 1 is completed, the movable table 11 is moved again to the central part of the bed 10. Move to. Then, the turntable 18 is rotated at a 90° angle in the center of the bed 10.
After the rotation, the movable table 11 moves again toward the grinding wheel grinding mechanism 13, and thereby finish grinding of the second surface of the support grid 1 is performed in the same manner. Then, when the above operations are repeated and the finish grinding of the third and fourth surfaces of the support grid 1 is completed, the movable table 11 returns to the center of the bed 10, and the grinding wheel grinding mechanism 13 automatically operates. stops. Next, the support grid 1 on the movable table 11 is removed from the turntable 18 after visually inspecting the ground tabs 6...
Note that the grinding wheel 45 is an automatic grinding wheel of the grinding device.
Dressing is performed appropriately by the dresser 48 when switching between manual operations.

According to such a grinding device, rough grinding of the tabs 6 by the belt grinding mechanism 12 and finish grinding by the grinding wheel grinding mechanism 13 can be continuously and automatically performed. Therefore, these grinding operations can be performed extremely efficiently without requiring any manual labor. In addition, mobile platform 1
A stepping motor 16 is used as a driving source of the motor 1, and in combination with the stepping motor 16, the amount of movement of the moving table 11 toward the belt grinding mechanism 12 is controlled;
Since the movable table drive control means 14 is provided to control the amount of rough grinding for the tabs 6, it is possible to always accurately perform the optimum amount of rough grinding. Furthermore, during the final grinding by the grinding wheel 45, a sensor 54 detects the upper and lower positions of each tab 6, 6 of the outer strap 3.
54, and based on this, finish grinding is performed for each tab 6, taking into account a predetermined safety value, so that the outer strap 3 of each tab 6... Finish grinding can be performed. Therefore, there is no need for manual final grinding using a final grinder, and it is possible to greatly reduce labor in the grinding work.

In the above embodiment, the tab 6 for temporary assembly in the support grid 1 of the reactor fuel assembly is shown as an example of the tab for temporary assembly that is removed by grinding, but the tab is not limited to this. According to this grinding device, it is possible to remove such temporary assembly tabs from various parts by grinding.

[Effects of the invention] As explained above, the automatic tab grinding device for temporary assembly of this invention is provided with a movable table on the bed, on which the product is mounted on the upper surface, movably by a driving means, and a part on one side of the bed. A belt grinding mechanism is provided on one side for rough grinding the tab protruding from the surface of the product mounted on the moving table, and a grindstone is provided on the other side of the bed for finishing grinding the tab after the rough grinding. a wheel grinding mechanism, and a movable base drive control means for controlling the amount of rough grinding of the tab by controlling the amount of movement of the movable base toward the belt grinding mechanism; A moving means for moving the grinding wheel toward the tab side of the surface of the product, and a grinding control means for controlling the amount of grinding of the tab by controlling the amount of movement of the grinding wheel of the grinding wheel grinding mechanism toward the tab side, The grinding control means is provided on the bed so as to be able to approach and separate from the surface of the product at a height different from the tab position of the product, and detects the surface position of the product by coming into contact with the surface of the product. a second sensor provided on the bed to detect the position of the grinding wheel;
a sensor; and a reference part that sets reference positions of the first sensor and the grinding wheel by bringing the first sensor and the grinding wheel into contact; The grinding amount of the tab on the surface of the product is set based on the surface position and the position of the grinding wheel from the reference portion detected by the second sensor. Therefore, according to the automatic tab grinding device for temporary assembly of this invention, rough grinding by the belt grinding mechanism and finish grinding by the grinding wheel grinding mechanism can be performed continuously and automatically without any manual effort. Moreover, the grinding control means allows the finish grinding to be carried out to the maximum extent possible without causing damage to anything other than the object to be ground. Therefore, it is possible to achieve comprehensive labor savings in this type of grinding work.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the automatic tab grinding device for temporary assembly of this invention. Figure 1 is a schematic front view, Figure 2 is a schematic plan view, and Figure 3 is a belt pressing. A schematic diagram of the construction of the means, FIGS. 4 and 5 show a support grid for a nuclear reactor fuel assembly, which is one of the objects to be ground. FIG. 4 is a schematic assembly diagram, and FIG. It is an enlarged view of a part. 1...Support grid, 6...Tab, 10...Bed, 11...Moving table, 12...Belt grinding mechanism,
13... Grinding wheel grinding mechanism, 14... Moving table drive control means, 15... Grinding control means, 16... Stepping motor (drive means), 18... Turntable, 23... Position sensor, 30... Belt grinding wheel, 32... Belt pressing means, 40... Photoelectric element, 42a... Stepping motor (moving means),
45... Grinding wheel, 52... Position sensor, 54...
Sensor, 57...Monitor strap (reference part).

Claims (1)

[Scope of Claim for Utility Model Registration] An automatic tab grinding device for temporary assembly that grinds and removes tabs protruding from the surface of a product, which comprises a movable table movably installed on a bed and on which a product is mounted. , a belt grinding mechanism disposed on one side of the bed for rough grinding a tab protruding from the surface of a product mounted on the moving table; and a belt grinding mechanism disposed on the other side of the bed. a grinding wheel grinding mechanism that performs finish grinding on the tab after rough grinding; driving means for the moving table that moves the moving table toward the belt grinding mechanism or the grinding wheel grinding mechanism; a movable table drive control means for controlling the amount of rough grinding on the tab by controlling the amount of movement toward the belt grinding mechanism; A movable base for moving the grinding wheel toward the side, a driving source thereof, and a grinding control means for controlling the amount of grinding of the tab by controlling the amount of movement of the grinding wheel of the grinding wheel grinding mechanism toward the tab side, The grinding control means is provided on the bed so as to be able to come into contact with and separate from the surface of the product at a height different from the tab position of the product, and the first grinding control means detects the surface position of the product by coming into contact with the surface of the product. a second sensor provided on the bed or the movable base to detect the position of the grinding wheel;
a reference part that sets reference positions of the first sensor and the grinding wheel by bringing the first sensor and the grinding wheel into contact with each other, the surface position of the product from the reference part detected by the first sensor; and the position of the grinding wheel from the reference part detected by the second sensor, the amount of grinding of the tab on the surface of the product is set. .