JPS6255029B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a coupling mechanism for a screw fastening device for opening and closing a pressure vessel. It consists essentially of two movably supported connecting jaws, each of which is provided on the inside with a groove molding for complementary engagement with the groove of the container bolt; of the type operated by a pressure medium actuated piston.

In the coupling device known from German Patent No. 1 300 467, both coupling jaws arranged opposite each other are connected to each other via pneumatically actuated cylinders. It is adapted to be independently engaged with and disengaged from the groove of the container bolt. In this case, the end of the operating function coincides with the end of the monitoring function, so that monitoring of the end position, for example by means of electrical limit switches, photoelectric devices or pneumatic sensors, is to the extent desired for opening and closing the pressure vessel. It cannot be done reliably.

In the coupling device known from German Patent No. 28 36 127, an actuating cylinder inclined with respect to the horizontal can be hinged on both sides to a holding mechanism fixed to the outer coupling jaw and to the inner coupling jaw. It is pivotally supported between the link mechanism connected to the In this case, the termination of the operating function is not related to the termination of the monitoring function, so that the end position can be reliably monitored. However, in this coupling device the coupling joint is simply locked by the weight of the actuating cylinder, so that a malfunction or a malfunction which causes a stress build-up in the actuating cylinder in the release direction can be prevented. This causes an inconvenient unlocking of the connecting joint.

Problem of the Invention Therefore, the problem of the present invention is to provide a connection mechanism of the type mentioned at the beginning, in which the open/closed state of each connection joint can be more reliably maintained during the tightening process in a screw tightening device and during bolt transportation. be.

Means for Solving the Problem This problem has been solved according to the invention in that the connecting joint is arranged in a suspended manner on the cover plate and that the mounting surface is provided with a recess.

Effects and Effects of the Invention According to this configuration, since the connecting jaw is disposed in a suspended manner on the cover plate, there is no need for a retainer at the height of the connecting jaw. Furthermore, in the recess provided in the seating surface, in the first movement section of the cylinder stroke or in the free suspension state of the bolt,
Each closed connection jaw engages, thereby ensuring increased safety of the screw-tightening device against failure or inadvertent release of the connection jaw. Furthermore, it is possible to additionally use the movement of the tensioning cylinder or the weight of the suspended bolt for locking the connecting joint in the closed position, so that this interlocking locking is extremely high. Be able to withstand the load. As a result, even in the event of malfunctions or malfunctions that would cause stresses in the opening direction in the actuating cylinder, it does not lead to an opening movement. Mechanical shocks, for example if the coupling unit hits an obstacle during the conveying movement of the screw tightening device, likewise do not cause the coupling unit to open.
A highly reliable locking of the connecting jaw during such tightening processes and during bolt transport is not possible with known devices. In practice, securing bolts weighing up to 800 Kg suspended in tightening equipment during transport between storage stands and pressure vessels, sometimes over and beyond extremely sensitive equipment. It can be locked and held, which is very advantageous.

Embodiment According to an advantageous embodiment of the invention, the coupling jaw is guided by a toggle lever mechanism. In this case, one lever of the toggle lever mechanism can be connected in a hinged manner to the coupling jaw and the other lever to the cover plate.

Embodiments Basically, two types of screwing devices are provided for different nuclear reactor pressure vessels. One type has an annular cylinder, and the other type consists of a plurality of pressure bridges and two differential cylinders arranged on each pressure bridge.
This pressure bridge structure is suitable when the required tension (force transmitted from the cylinder to the container bolt) is high and the bolt spacing is small, while the annular cylinder structure is suitable when the necessary tension is low and the bolt spacing is large. There is.

In the case of a screw tightening device with several annular cylinders, a recess can be provided in the upper annular piston. It is also possible, instead of providing a recess in the annular piston itself, to arrange a pressure transmission plate with a recess on the upper annular piston. Furthermore, in the case of screw-fastening devices equipped with several pressure bridges each having two differential cylinders, the provision of recesses in the pressure bridges eliminates the need for a pressure transmission plate and makes the entire structure suitable. It is advantageously possible to shorten the length.

In the illustrated coupling mechanism, a container bolt 10 is arranged in a hole 11 in a cover flange 12 and its lower end 13 is screwed into a container flange 14. The clamping ring 15 covers a nut 16 and carries an annular cylinder arrangement 17, which in the embodiment according to FIG. It consists of an annular cylinder 20, in which a respective annular piston 19, 21 is arranged which is slidably supported in the axial direction. Annular piston 2
A pressure transmitting plate 22 is located on top of the pressure transmitting plate 22 . If space permits, it is also possible to form the upper annular piston 21 and the pressure transmission plate 22 as one part.

Between the pressure transmission plate 22 and the cover plate 23, an inner connecting joint 24 and an outer connecting joint 25 are arranged, which can be moved into an open position and a closed position by a connecting cylinder 26 fixed to a holding mechanism 27 and a link mechanism 28. It is arranged so that it can be moved between. cover plate 2
Toggle lever mechanisms 29, 30 are arranged on the toggle lever mechanisms 3, and the connecting jaws 24, 25 are guided through the toggle lever mechanisms 29, 30.

In particular, as is clear from FIG. 2, in the toggle lever mechanisms 29 and 30, one lever 3
1 is hingedly connected to the cover plate 23 via a hinge pin 32, and the other lever 33 is connected to the inner connecting joint 24 via a hinge pin 34. The toggle lever mechanism 30, which is not illustrated in detail in the drawings, also has a corresponding construction.

A recess 35 is provided in the pressure transmission plate 22, into which the closed coupling jaws 24, 25 are inserted during the first travel distance of the cylinder stroke or in the free suspension state of the container bolt (screw) 10. are engaged in a mating manner.

On both sides of the inner connecting jaw 24 are arranged rods 36, 37 forming a linkage 28, which are connected to each other by a connecting rod 38. Outer connection joint 2
A retaining plate 3 forming a retaining mechanism 27 is provided at both ends of the retaining plate 3.
9, 40 are arranged, the outwardly projecting ends 41 and 42 of this holding plate being bent slightly downward. A cam track 43 is provided within the holding plates 39, 40, the lower end 44 of which extends vertically upwardly, and the upper end 45 of the cam track 43 extends vertically upwardly.
extends at an angle toward the horizon. Rod 3
6, 37 have a guide roller 46 which is guided in a cam track 43.

The connecting cylinder 26 is hingeably disposed between bent ends 41 and 42 of retaining plates 39 and 40, respectively, and the piston rod 48 is also hingeably disposed on the coupling rod 38. ing.

Next, the mode of operation of the mechanism according to the present invention will be explained.

The coupling mechanism shown in the drawing is in its closed position. When the connecting cylinder 26 is loaded with a pressure medium in the direction in which the piston rod 48 is moved, the connecting rod 38 first moves vertically upwards in a straight line over a short distance and then moves along the inclined cam track 4.
Corresponding to 3, it moves linearly and tilts upward to the left. At this time, one of the connecting jaws 24 and 25 is first separated from the groove portion 49 of the container bolt 10. Which of these two connecting joints 24 and 25 is connected to the container bolt 1?
Whether it moves away from the groove portion 49 of 0 is completely coincidental. For example, assuming that the inner connecting jaw 24 first leaves the groove, this movement will cause the inner connecting jaw 24 to move away from the toggle lever mechanism 29.
This continues until the end position for the connecting jaw 24 is reached, which is defined by . From this moment on, the outer coupling jaw 25 moves towards the right until it reaches the end position defined for it by the toggle lever mechanism 30.

On the other hand, if the outer connecting joint 25 first leaves the groove 49 of the container bolt 10,
This coupling jaw 25 is moved to the right until it reaches the end abutment defined by the toggle lever mechanism 30. From this moment, the inner connecting jaw 24 also begins to move away from the groove 49 of the container bolt 10 to the left until it reaches the end abutment defined by the toggle lever mechanism 29.

If the coupling cylinder 26 is loaded in the opposite direction, ie in the direction that causes the piston rod to move into the coupling cylinder 26, the above-mentioned movement course will correspondingly take place in reverse.

The operation of the screw tightening device as a whole is as follows.

In the starting position, the container cover is mounted and the cover flange 12 is located on the container flange 14. The container bolt 10 is also locked and suspended in the screwing device by a screwed container nut 16. A crane then transports the screwing device to be suspended on the cover beam from the storage location onto the reactor pressure vessel. At this position, approximately 1 m above the cover flange 12, a connection is made between the drive mechanism of the screw-tightening device and the associated switching point. Subsequently, the work piece is brought into position and the screwing device is arranged thereon.

Following this, the screwing device is lowered parallel to the cover flange 12 by means of its own drive, in which case the container bolt 10 is lowered onto the container flange 12.
is inserted into the hole 11 of. This container bolt 10, which is suspended just above the threaded hole in the container flange 14, is then received from the screwing device by a movable rotating and lifting device, unloaded and controlled to remove the container. Screwed into the threads of flange 14.

Subsequently, each connecting jaw 24, 25 is engaged with the groove 49 of the container bolt. The annular cylinder arrangement 17 is then loaded with pressurized oil for a suitable length of time and intensity until the desired tension is built up in the container bolt 10. This tension lengthens the container bolt 10 somewhat, thus creating a certain free distance between the container nut 16 and the top surface of the container flange 12. After this, the container nut 16 is rotated further until it again comes into contact with the surface of the cover flange 12.

Subsequently, the annular cylinder arrangement 17 is unloaded. Thereafter, the connecting jaws 24, 25 are removed from the grooves 49 of the bolts. The container bolt 10 thereby exhibits a tendency to act similar to a tensioned spring returning to its original state after relaxation. However, this is not possible in the tightened state of the container nut 16, so that the required closing force between cover flange 12 and container flange 14 is thus ensured.

The opening process follows the same sequence in reverse order.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
Figure 1 is a sectional view showing the cover flange and container flange in the area of the screw tightening device and container bolt, Figure 2 is an enlarged view of the X section in Figure 1, and Figure 3 is a top view of Figure 2. FIG. 10... Container bolt (screw), 11... Hole, 1
2...Cover flange, 13...Lower end, 14...
...Container flange, 15... Tightening ring, 16...
Nut, 17... Annular cylinder device, 18, 20
... Annular cylinder, 19, 21 ... Annular piston, 22 ... Pressure transmission plate, 23 ... Cover plate, 24, 25 ... Connection jaw, 26 ... Connection cylinder, 27 ... Holding mechanism, 28 ... Link Mechanism, 29, 30... Toggle lever mechanism, 31, 3
3... Lever, 32, 34... Hinge pin, 35
... recess, 36, 37 ... rod, 38 ... coupling rod, 39, 40 ... retaining plate, 41, 42 ...
End part, 43... Cam track, 44... Lower side part,
45... Upper part, 46... Guide roller, 48...
Piston rod, 49... groove section.

Claims (1)

[Scope of Claims] 1. A connecting mechanism for a screw tightening device for opening and closing a pressure vessel, which comprises two connecting joints arranged facing each other and movably supported between a cover plate and a mounting surface. The inside of each connecting jaw is provided with a groove molding for complementary engagement with the groove of the container bolt, and each connecting jaw is connected to a pressure medium actuated piston. A screw tightening device of the type that is operated in this manner, characterized in that the connecting jaws 24, 25 are arranged in a suspended manner on a cover plate 23, and a recess 35 is provided in the mounting surface. Coupling mechanism for. 2 The connecting jaws 24 and 25 are the toggle lever mechanism 2
9. The coupling mechanism according to claim 1, wherein the coupling mechanism is guided by 9, 30.