CZ2012639A3 - Sequencing of gear block tightener of flanged joint bolts - Google Patents

Abstract

Advantageously, the fitting of the flange joint bolt tightener is advantageously utilizable for flange joints of the upper reactor core block. It is part of the gearbox to which two sets of tightening rods are attached to tighten and / or loosen the bolt. Shifting the gearbox is used to connect and disconnect the drive of the tightening rod assemblies. It consists of two control levers (1, 1 ') connected to pinions (12, 12') to control the control rings (9, 10). The control rings (9, 10) are used to operate the control forks (14, 15). The control forks (14, 15) are supported on the collars of the claw couplings (8, 8 ') which are slidably mounted on the shafts (7, 7') fitted with tightening rods. The claw couplings (8, 8 ') are secured against rotation to the shafts (7, 7') and are engaged with sprockets (6, 6 ') by means of springs (16, 16') to transfer the torque from the gears (6 , 6´) on the shaft (7, 7´) through the pens (17, 17´). The gears (6, 6 ') are connected to the gearbox drive assembly. The control forks (14, 15) movable on the slideways (18, 18 ') are compressible and releasable springs (16, 16') and thus the claw couplings (8, 8 ') are retractable and engageable with the gears (6 , 6 '). By changing the position of the control levers (1, 1 ') from one position to the other, the rotatable control rings (9, 10) are engaged to engage the toothed clutches (8, 8') with the gears (6, 6 ') and vice versa.

Description

Flanged bolt tightener transmission block stamping

Field of technology

The present invention relates to the field of gears for tightening bolted joints. The invention is advantageously usable for servicing in the field of nuclear technology.

State of the art

The known tightening tighteners of flanged joints of the upper units of nuclear reactors are of two types - working on the principle of hydraulic prestressing of the bolt by axial tension or on the principle of electric tightening of the bolted joint with torque. The flange connections of the upper units of nuclear reactors contain, depending on the specific type, one or two six screw connections.

The first type of flange connection is equipped with screw connections: 6 x bolts + nuts and contains only the main flange: It is therefore only one type of sealing surfaces, containing the primary seal and the secondary seal. When sealing a joint of this type, the bolts are prestressed and secured by turning (tightening) the nuts. This will tighten the main flange and seal the surfaces.

The second type of flange connection includes a main flange and a push-off flange (thus containing two types of sealing surfaces). In addition to the above screw connections for the main flange in the form: 6 x bolts + nuts, with primary and secondary seal, also contains screw connections in the form: 6 x push-off screws for the push-off flange, with tertiary seal. When sealing a joint of this type, the bolts will be prestressed and secured by turning the nuts, and the thrust bolts will be tightened for a moment. By tightening them, the push-off flange is pushed out and the second type of surfaces is sealed.

Some of the pre-tensioning tighteners allow tightening / loosening of flange connections with main flange and push-off flange, where the flanges are composed of double-type screw connections (6 x bolts + nuts and 6 x push-off screws). However, they usually do

- 2 tightening / loosening of flange connections only with main flange and one type of screw connection (6 x bolts + nuts). Tighteners are able to tighten / loosen flange joints in one setting, which means that for flange joints with main and push-off flanges, they are able to operate both types of bolted joints at the same time. They are therefore equipped with two types of rods. The first type, or tie rod, is designed for bolts and allows hydraulic tensioning of bolts for extension with manual tightening of the nut on the flange using a torque wrench. The second type, or tightening rod, is designed for push-off bolts and allows you to manually tighten the bolts to a torque using a torque wrench. Before tensioning the bolt itself, it is necessary to mount the bolt elongation measuring sensor, which is integrated in the drawbar, on the front of the bolt and then connect it to the evaluation apparatus. After tightening, before lifting the wrench from the joint, it is necessary to disconnect the extension sensor from the apparatus and then remove it from the front of the bolt.

The disadvantage of this solution is the complicated and lengthy preparation of the wrench before the actual tightening as well as the subsequent preparation before lifting the wrench from the joint. This increases the time required to tighten / loosen the joint.

Another of the prestressing wrenches allows tightening / loosening of a part of the flange connections with the main and push-off flange, while the flanges are composed of screw connections of two types (bolts + nuts and push-out screws). The tightener is equipped with one type of tightening rod for tightening / loosening the thrust bolts for a moment.

The disadvantage of this solution is the impossibility of tightening / loosening the entire flange joint, but only a part of it, which prolongs the time required for tightening / loosening the joint.

Another type of wrench used is the electric wrench. The electric wrench allows tightening / loosening of flange connections with the main and push-off flange, while the flanges are composed of screw connections of two types (bolts + nuts and push-out screws). It also allows tightening / loosening of flange connections with only the main flange and one type of screw connection (nuts + nuts) for a moment. It is therefore equipped with tightening rods with interchangeable heads with an internal hexagon for both types of screw connections. The tightening rods are connected to the outputs of the transmission block, which is driven by electronically controlled drives. Before setting the tightener on the flange joint, it is necessary to mount the tightening rods with the appropriate heads to the respective outputs of the transmission block, depending on the type of bolted connection to be operated. After guiding the tightener to the flange connection and starting the tightening / loosening process, the first type of screw connection is tightened / loosened. The next step is to lift the tightener, disassemble the tightening rods,

- 3 -: Ύ '. .

: ί also replacement of heads and assembly of tightening rods to the respective terminals of the transmission block. After guiding the tightener on the flange connection and starting the tightening / loosening process, the second type of screw connection is tightened / loosened.

The disadvantage of this solution is the impossibility of tightening / loosening the flange joint to one setting, which is caused by the necessary replacement of the hexagon socket and the transfer of the tightening rod to the appropriate terminal of the transmission block. This prolongs the time required to tighten / loosen the joint and prolong the exposure of the operating personnel to the effects of ionizing radiation.

The essence of the invention

The essence of the invention is the structural design of the shift block of the flange joint bolt tightener. The subject of the invention is advantageously applicable to a bolt tightener of flange joints of the upper block of a nuclear reactor.

The transmission block is part of a transmission block to which two six tightening rods are connected to tighten and / or loosen the bolts. The first six tightening rods contain an integrated measurement of the elongation of the tightened bolts. The transmission block consists of two control levers with two positions. The first control lever is connected to the first pin housed in the first housing and is connected to the first shaft via a first set of joints and a first control rod. A first pinion is mounted on the first shaft to operate the upper control ring by means of a first toothed rack. The second control lever is connected to the second pin housed in the second housing and is connected to the second shaft via a second set of joints and a second control rod. A second pinion is mounted on the second shaft to operate the lower control ring by means of a second toothed rack.

The upper control ring is provided around the circumference with grooves and oblique cut-outs for engaging the pins of the first six control forks mounted on the first six slideways. The first six control forks are controllable by the upper control ring.

The lower control ring is provided around the circumference with grooves and oblique cut-outs for engaging the pins of the second six control forks mounted on the second six slideways. The second six control forks can be operated with the lower control ring.

The first six control forks are supported on the collars of the first six toothed couplings, which are slidably mounted on the first six shafts provided with tightening rods. Gear couplings are

- secured against rotation relative to the shafts and by means of the first six springs engage with the first six gears to transmit torque from the first six gears to the first six shafts via the springs.

The second six control forks are supported on the collars of the second six toothed couplings, which are slidably mounted on the second six shafts provided with tightening rods. The toothed couplings are secured against rotation relative to the shafts and, by means of a second six springs, engage a second six gears to transmit torque from the second six gears to the second six shafts via the springs. All gears are connected to the transmission block drives at the same time.

The control forks, which are movable on the slideways, are compressible and releasable springs and thus the toothed couplings can be extended and retracted from and into engagement with the gears. By changing the position of the first lever from 0 ° to 180 °, the upper control ring is rotatable to engage the first six gear couplings in engagement with the first six gears.

By changing the position of the second lever from 0 ° to 180 °, the lower control ring is rotatable to disengage the second six gear clutches from engagement with the second six gears. In the opposite way, the first six toothed couplings can be extended and the second six toothed couplings can be inserted. The proposed arrangement of the flange joint bolt transmission block allows, in the case of use for nuclear reactor lid flange joints, tightening / loosening of flange joints with main and push-off flanges, which consist of two types of screw connections (coils + nuts and push-off screws). It also allows tightening / loosening of flange connections with only the main flange and one type of screw connection (bolts + nuts).

Thanks to the above-mentioned shifting of the transmission block, the tightener is able to tighten / loosen the flange joints in one setting. This means that for flange connections with main and push-off flanges, it is able to operate both types of screw connections at the same time. Therefore, two types of tightening rods are connected to the transmission block, the first type being designed for bolts and allowing the bolts to be tightened for extension and the second type being designed for push-off bolts and allowing the bolts to be tightened for a moment.

Preferably, the shift block of the present invention is part of a tightener formed by a control box with appropriate software, a transmission block with electronically controlled drives, tightening rods and a base frame. After guiding the tightener on the flange joint, the tightening rods will abut the bolted joints. By starting the tightening / loosening process, the first type of screw connection is tightened / loosened. Then manual selection is made using both control levers

- 5 of the second type of screw connection and start of the second tightening / loosening process. This is followed by lifting the wrench from the flange joint and transporting it to the next joint.

The advantage of this solution is the simplicity and speed of operation of the tightener, which reduces the time required to tighten / loosen the joint. As a result, the shutdown of the nuclear reactor is shortened and the dose of ionizing radiation of the operating personnel during assembly is reduced.

Overview of figures in the drawings

An exemplary embodiment of the proposed solution is described with reference to the drawings, in which FIG. ridges, Fig. 4 - general view of the transmission block.

Exemplary embodiment

The flange joint bolt transmission block arrangement of the present invention is applicable to the flange connections of the upper block of a nuclear reactor. The transmission block is part of a transmission block to which two six tightening rods are connected to tighten and / or loosen the bolts. One of the six tightening rods contains an integrated measurement of the elongation of the tightened bolts.

The transmission block consists of two control levers 1, Γ with positions 0 ° and 180 °. The first control lever 1 is connected to the first pin 2 housed in the first housing 3 and connected to the first shaft 13 via the joints 4 of the first set and the first control rod 5. A first pinion 12 is mounted on the first shaft 13 to control the upper control ring 9 by the first gear ridge H.

The second actuating lever 1 'is connected to the second pin T accommodated in the second housing 3a and is connected to the second shaft 13' via the joints 6 of the second set and the second actuating rod 6 '. A second pinion 12 'is mounted on the second shaft 13' to actuate the lower control ring 10 by means of a second toothed rack 1Γ.

- 6 -,, .. ’’

The upper actuating ring 9 is provided circumferentially with grooves and oblique cut-outs for engaging the pins of the first six actuating forks 14 mounted on the first six sliding guides 18. The first six actuating forks 14 can be actuated by the upper actuating ring 9.

The lower control ring 10 is provided circumferentially with grooves and oblique cut-outs for engaging the pins of the second six control forks 15 mounted on the second six slideways 18 '. The second six control forks 15 can be operated by the lower control ring 10.

The first six control forks 14 are supported on the collars of the first six toothed couplings 8, which are slidably mounted on the first six shafts 7 provided with tightening rods. The gear couplings 8 are secured against rotation relative to the shafts 7 and by means of the first six springs 16 the first six gear couplings 8 engage the first six gears 6 to transmit torque from the gears 6 to the shafts 7 via the springs 17. The gears 6 are connected with six transmission block drives.

The second six control forks 15 are supported on the collars of the second six toothed couplings 81, which are slidably mounted on the second six shafts T provided with tightening rods. The gear couplings 8 'are secured against rotation relative to the shafts 7' and by means of the second six springs 16 'the second six gear couplings 8' engage with the second six gears 6 'to transmit torque from the gears 6' to the shafts 7 'via the springs. 17 '. The gears 6 'are connected to six drives of the transmission block.

The control forks 14, 15 movable along the sliding guides 18, 18 'are compressible and releasable springs 16, 16' and thus the toothed couplings 8, 8 'are extendable and engageable with and in engagement with the gears 6, 67'.

By changing the position of the first control lever 1 from 0 ° to 180 °, the upper control ring 9 is rotatable to insert the first six toothed couplings 8 into engagement with the gears 6.

By changing the position of the second control lever U from 0 ° to 180 °, the lower control ring JO is rotatable to disengage the six toothed clutches 8j from the engagement with the gears 67.

The tightener equipped with the gear block arrangement allows tightening / loosening of all flange connections of the upper block of the VVER 1000 reactor.

An exemplary embodiment can be seen in FIGS. 1 to 4.

-7 List of Reference Marks

- the first control lever

1 '- second control lever

- first pin

2 '- second pin

- the first case

3 '- second case

- joint of the first set

4 '- joint of the second set

- the first control rod

5 '- second control rod

- first six gear

6 '- gear of the second six

- shaft of the first six

7 '- shaft of the second six

- first six gear coupling

8 '- second six tooth coupling

- upper control ring

- lower control ring

- the first toothed rack

1Γ - second toothed rack

- first pinion

12'- second pinion

- first shaft

13'- second shaft

- control fork of the first six

- control fork of the second six

- spring of the first six

16 '- spring of the second six

- first set pen

17 '- pen of the second set

- sliding guide of the first six

- 8 18'- sliding guide of the second six

Claims (1)

Patent claims Ø Gearing of the flange joint bolt transmission block, preferably usable for flange connections of the upper nuclear reactor block, being part of a transmission block to which two six tightening rods are connected to tighten and / or loosen bolts, where the first six tightening rods contain integrated measurement extension of tightened bolts, characterized in that it consists of two control levers (1), (1) with two positions, the first control lever (1) being connected to the first pin (2) housed in the first housing (3) and via joints (4) the first set and the first control rod (5) are connected to the first shaft (13) on which the first pinion (12) is mounted to control the upper control ring (9) by means of the first toothed rack (11) and the second control lever (1). ) is connected to the second pin (2 ') housed in the second housing (3') and is connected via the joints (4) of the second set and the second control rod (5 ') to the second shaft (13') on which the second pinion ( 12 ') to control the lower control p (10) by means of a second toothed rack (11 '), the upper control ring (9) being provided around the circumference with grooves and oblique cut-outs for engaging the pins of the first six control forks (14) mounted on the first six slideways (18), where the first the six control forks (14) are controllable by the upper control ring (9), and the lower control ring (10) is provided circumferentially with grooves and oblique cut-outs for engaging the pins of the second six control forks (15) mounted on the second six slideways (18 ') , where the second six control forks (15) are controllable by the lower control ring (10), the first six control forks (14) are supported on the collars of the first six toothed couplings (8) which are slidably mounted on the first six shafts (7) provided with tightening which are secured against rotation relative to the shafts (7) and by means of the first six springs (16), the first six gear couplings (8) engage with the first six gears (6) to transmit torque from the gears (6) to sin part (7) via springs (17), which gears (6) are connected to six drives of the transmission block, and the second six control forks (15) are supported on the collars of the second six gear couplings (8), which are slidably mounted on the second six shafts (7 ') provided with tightening rods and which are secured against rotation relative to the shafts (7') and by means of the second six springs (16 ') - 10-. ,. / a second six gear couplings (8) in engagement with a second six gears (6 ') to transmit torque from the gears (6') to the shafts (7 ') via the springs (17'), which gears (6 ') are connected to six drives of the transmission block, and the control forks (14), (15) movable along the sliding guides (18), (18 ') are compressible and releasable springs (16), (16') and thus are extendable and retractable toothed clutches (8), (8 ') from and into engagement with the gears (6), (6'), wherein by changing the position of the first control lever (1) from one position to another the upper control ring (9) is rotatable to engage the first six of the toothed clutches (8) into engagement with the gears (6), and vice versa, and by changing the position of the second control lever (1 ') from one position to another, the lower control ring (10) is rotatable to extend the second six toothed clutches (8') from the engagement with the gears (6 '), and vice versa.