UA116259U - METHOD OF REPLACING WORKING AND SUPPORT ROLLS OF QUARTO ROLLING CAGE - Google Patents

Abstract

The method of replacing the working and support rolls of the quarto rolling stand includes removing the set of working rolls from the stand by means of a transshipment hydraulic cylinder, transporting them to the roller grinder on rails using a self-propelled trolley, inserting inserts into the stand, removing new support shafts rolls, transportation from a roller grinding workshop and introduction in a cage of a set of new working rolls. The upper worked support roll is removed from the stand separately from the lower roll on the insert by a transfer hydraulic cylinder for working rolls, transported to the roller grinding workshop on the insert, replaced with a new roll, which is transported to the stand on the rails by means of a self-propelled cart. for working rolls.

Description

The useful model belongs to rolling production and can be used in devices for replacing working and support rolls of rolling cages of quarto sheet mills.

A known method of replacing (transshipping) working and support rolls of quarto cages, which includes removing a set of working rolls from the cage with a hydraulic cylinder, introducing inserts into the cage for transshipment of the upper support roll, removing with the same hydraulic cylinder sets of activated support rolls with inserts from the cages, crane replacement of support rolls replacement of rolls in front of cages for new ones, introduction of new support rolls into the cage, removal of inserts and introduction of new working rolls into the cage (H.G. Fomin, A.V. Dubeykovsky and P.S. Grynchuk. Mechanization and automation of hot rolling mills. - M.: Metallurgy, 1979. - pp. 86-91, fig. 51).

The disadvantage of the method is the significant time spent on its implementation, due to the presence of six crane operations on each cage for removing the activated support rolls from the cage with an insert and installing new ones. During the simultaneous transshipment of a 6-7-cell finishing group, about 40 crane operations are carried out, which leads to significant costs of transshipment time (up to 6-8 hours). Another disadvantage of the method is the difficulty of maintaining the condition, since the activated working and support rolls, which are pulled out of the cages, remain after transshipment directly near the cages and need to be taken by crane to the roller grinding workshop (VSHM), which takes approximately 40-60 minutes after transshipment is finished. The same amount of time is spent before the start of transshipment for feeding from the VSHM and installing new work rolls in the cage.

The closest to the proposed solution is the method of transshipment of the working and support rolls of the quarto cages, given in the prospectus of the company Vapivia (Italy) "Oapieiii Tespoiodisa! RasKadevs", 2015. - Sat. 148-149, which includes removing the working rolls from the cage and transporting them to the VSHM using self-propelled carts, introducing inserts into the cage for transshipment of the upper support rolls, joint removal of the upper and lower support rolls with an insert from the cages using hydraulic cylinders for transshipment of the support rolls, crane replacement of worn out support rolls with new ones, introduction of new support rolls into the cage, removal of inserts, transportation from VSHM and introduction of new work rolls.

The advantage of the known transshipment method in comparison with the analogue is the simplification of maintenance of the state due to the craneless transportation of sets of working rolls from the state to the VSHM and back, which is carried out by self-propelled carts.

The disadvantage of the method adopted as a prototype is the significant time spent on transshipment of support rolls, associated with the execution of six crane operations on each cage in the transshipment cycle (sequential removal of the activated upper support roll, insert, lower support roll and installation of new rolls in the reverse sequence ). In addition, at the end of transshipment, sets of activated support rolls remain near the cages, which require crane assembly in the VSHM, which complicates maintenance of the condition after transshipment.

According to the set of essential features, the described device is the closest analogue (prototype).

The useful model is based on the task of increasing the productivity of cages of quarto sheet rolling mills.

The task is solved due to the technical result, which consists in reducing the duration of transshipment of rolled rolls in cages of quarto sheet rolling mills.

To achieve the specified result in the method of replacing the working and support rolls of the quarto rolling mill, which includes removing a set of working rolls from the cage with the help of a transfer hydraulic cylinder, transporting them to the roller grinding workshop on rails using a self-propelled trolley, introducing inserts into the cage, removing the activated support rolls from the cage of rolls and introduction of new support rolls into the cage, transportation from the roller grinding workshop and introduction of a set of new work rolls into the cage, according to the useful model, the upper activated support roll is removed from the cage separately from the lower roll on the insert by a transfer hydraulic cylinder for work rolls, transported to the roller grinding workshop on the insert, is replaced with a new roll, which is transported to the cage on the insert on rails using a self-propelled trolley and introduced into the cage on the insert with a transfer hydraulic cylinder for working rolls.

The known and proposed method has the following general features: - removal of a set of working rolls from the cage using a transshipment hydraulic cylinder; - transportation of a set of working rolls to the roller grinding workshop on rails using a self-propelled trolley; - introduction of an insert into the cage; - removal of activated support rolls from the cage; 60 - introduction of new support rolls into the cage;

- transportation from the roller grinding workshop and introduction of a set of new working rolls into the cage; as well as the following distinguishing features: - the upper activated support roll is removed from the cage separately from the lower roll on the insert with a hydraulic cylinder for the working rolls; - transported to the roller grinding workshop on an insert; - replaced with a new roll, which is transported to the cage on the insert on rails with the help of a self-propelled trolley and introduced into the cage on the insert with a transshipment hydraulic cylinder for working rolls.

Thus, the proposed method contains new actions and a new relationship of actions.

The cause-and-effect relationship between the set of declared signs and the technical result is as follows.

Due to the fact that the upper activated support roll is removed from the cage separately from the lower roll on the insert by a transfer hydraulic cylinder for working rolls, transported to the roller grinding workshop on the insert, replaced with a new roll, which is transported to the cage on the insert on rails with the help of a self-propelled trolley and introduced into the cage on the insert with a transshipment hydraulic cylinder for working rolls, it became possible to distribute transshipments of the upper and lower support rolls and perform transshipments of the upper support roll with means for transshipment of work rolls without any crane operations. That is, 4 crane operations are excluded from the transshipment cycle (removal of the activated upper support roll from the insert, removal of the insert from the activated lower support roll, installation of the insert on the new lower support roll and installation of the new upper support roll on the insert), which allows to reduce the transshipment duration by at least for 20 minutes on each cage. At the same time, the crane replacement of the upper support roll on the insert is carried out in the roller grinding workshop at the same time as the longer transshipment, crane replacement and filling of the lower support roll into the cage and does not affect the total duration of transshipment.

Exclusion of at least one of them from the above set of features will not ensure the achievement of a technical result. The claimed technical solution is not known from the prior art, therefore it is new.

The claimed method is technically feasible, since all the technical means necessary for its implementation are included in the composition, which are regularly produced by well-known firms - manufacturers

From metallurgical equipment, including devices for replacing rolls of quarto cages. Moreover, the method can be implemented on existing rolling mills equipped with traditional transfer devices similar to the prototype.

Calculations showed that the duration of the complex transshipment of working and support rolls on the 7-cell finishing group of the wide-scale mill 2000 hot rolling mill of the Magnitogorsk Metallurgical Combine when implementing this method is reduced to 3 hours compared to 6 hours when using the method according to the prototype.

The essence of the technical solution is explained by the drawings, which show:

Fig. 1 - quarto rolling cage with transshipment device (position before transshipment, plan view);

Fig. 2 - section A-A in fig. 1,

Fig. C - section A-A in fig. 1 (position when replacing the upper support roll);

Fig. 4 - section A-A in fig. 1 (position when replacing the lower support roll).

The method is implemented on a quarto rolling mill 1, which has a set of working rolls 2, a lower support roll 3, an upper support roll 4, a balancing mechanism 5 of the upper support roll 4 and slides 6 for the lower support roll 3.

The replacement of shafts 2, C and 4 is carried out by a transshipment device, which includes a self-propelled carriage 7, a carriage 8, which is installed in front of the cage 1 and is movable along the rolling axis, a platform 9, which is movable in the direction of transshipment, a hydraulic cylinder 10 for pulling and inserting the lower support roll 3 , a lifting and lowering plate 11 with a transshipment hydraulic cylinder 12 for pulling out and inserting a set of working rolls 2 and an insert 13 for transshipment of the upper support roll 4 (Fig. 2).

The self-propelled trolley 7 is intended for transportation from the cage 17 to the roller grinding workshop (VPM) 14 and back, a set of working rolls 2 and an insert 13 with the upper support roll 4 along the rails 15 on the plate 11 and their rail extension 16 in the VSHM 14. The traction force of the trolley 13 is calculated for the effort of removing and inserting the working rolls into the cage (in case of failure of the transfer hydraulic cylinder 12) and is 60 95 of the weight of the set of working rolls. Traction force is created by the spigot coupling 17 (Fig. 2)

Carriage 8 has two pairs of rails 18 and 19 for moving sets of work rolls 2, self-propelled carriage 7 and insert 13. Rails 18 and 19 are able to alternately communicate with rails 15 on 60 of the lifting and lowering plate 11.

The platform 9 is made movable in the direction of transshipment, carries guides for moving the carriage 8 and is made with the possibility of connection with the hook carriage 20 of the transshipment hydraulic cylinder 12.

The insert 13 is a welded metal structure with rollers 21 on rolling roller bearings and has the ability to move along the rails 15, 16, 18 and 19. The insert 13 is made with two support planes 22 for installing the pillows of the upper support roll Z (fig. 3).

The method of replacing the working and support rolls of the quarto rolling mill is implemented as follows.

During the operation of the mill, before the complex transshipment of the working and support rolls, the insert 13 is installed by a crane (not shown in the figure) on the rails 19 of the carriage 8 on the side of the cage 1. At the beginning of transshipment, a set of activated working rolls 2 is removed from the cage by the movement of the transshipment hydraulic cylinder 12, the plate is lowered 11 and a self-propelled carriage 7 transports it to the VSHM 14 on rails 18, 15 and 16. The carriage 8 is moved along the rolling axis to the installation of rails 19 along the axis of the cage 1.

By repeated movement of the hydraulic cylinder 12, the insert 13 is introduced into the cage 1 and the activated upper support roll 4 is lowered onto it by the balancing mechanism 5 (the roll cushions are placed on the planes 22 of the insert 13). With the transfer hydraulic cylinder 12, the insert 13 with the roll 4 is removed from the cage, the plate 11 is lowered and the insert 13 with the activated support roll 4 is transported by the self-propelled carriage 7 along the rails 19, 15 and 16 in the VSHM 14 (Fig. 3). The effort of transportation along the rails of the upper support roll 4 on the insert 13 with rollers 21 on rolling bearings is significantly lower than the effort of filling into the cage of the set of work rolls 2, for which the self-propelled carriage 7 is designed (6095 from the weight of the set of work rolls 2), therefore, the increase in traction force, weight and the power of the self-propelled cart 7 is not required for the implementation of this method.

With the next stroke of the transshipment hydraulic cylinder 12, with the help of the hook carriage 20, the platform 9 with the carriage 8 is pushed away from the cage 1 under the raised plate 11, freeing up the space in front of the cage (transshipment slot) for removing the lower support roll 3.

With the hydraulic cylinder 10, the lower support roll Z is removed from the cage 1 onto the slides 6. The activated lower support roll Z is taken away by a crane (not shown in the figure), a new roll is installed on the slides 6 and introduced into the cage 1 with the hydraulic cylinder 10. At the same time, the VSHM 14 is replaced with a crane (not shown in the figure) activated upper support roll With on the insert 13 with a new roll.

The platform 9 with the carriage 8 is returned to the cage 1, and the plate 11 is lowered with the next stroke of the transshipment hydraulic cylinder 12.

The self-propelled carriage 7 transports the new upper support roll Z along rails 16, 15 and 19 to the carriage 8, then the self-propelled carriage 7 is taken back to the VSHM 14 for a new set of working rolls 2. The plate 11 is raised and the insert 13 with the new upper support is inserted with the transfer hydraulic cylinder 12 roll 4 in a cage. After lifting the upper support roll from the insert by the balancing mechanism 5 of the cage 1, the transfer hydraulic cylinder 12 removes the insert 13 from the cage onto the carriage 8. The carriage 8 moves in the direction of rolling, removing the insert 13 from the cage and freeing the passage for feeding a set of new working rolls to the cage 2 by a self-propelled carriage 7 on rails 16, 15 and 18. Then the self-propelled trolley 7 is moved beyond the plate 11 and a set of new working rolls is introduced into the cage 1 with the transfer hydraulic cylinder 12.

Thus, the complex replacement of the working and support rolls of the quarto rolling cage requires only two crane operations per cage in the stationary run (removal of the operated lower support roll and installation of a new lower support roll), which significantly reduces the transshipment time compared to the prototype device. Crane operations in VSHM are carried out simultaneously with crane and machine operations in the cage and do not require additional time. The reduction in transshipment time is at least 20 minutes per cage, and for the b-cage finishing group of the wide-staff condition, the time of complex replacement of working and support rolls is reduced by at least 2 hours. Taking into account that the support rolls are replaced 1-2 times a week, and the productivity of wide-frame mills is 800...1000 t/hour, the annual increase in production will be 80,000...200,000 tons of rolled steel. At the same time, the implementation of the proposed transshipment method does not require complication and increase in the price of either the cage or the transshipment device itself.

In this way, the implementation of the technical solution, according to the formula of the useful model, will reduce the duration of transshipment of rolled rolls in cages of quarto sheet rolling mills and increase the productivity of work of cages of quarto sheet rolling mills.

Claims (2)

USEFUL MODEL FORMULA The method of replacing the working and support rolls of the quarto rolling cage, which includes removing 60 sets of working rolls from the cage using a transfer hydraulic cylinder, transporting them to the roller grinding workshop on rails using a self-propelled trolley, introducing inserts into the cage, removing the used support rolls from the cage and introduction of new support rolls into the cage, transportation from the roller grinding workshop and introduction of a set of new work rolls into the cage, which differs in that the upper activated support roll is removed from the cage separately from the lower roll on the insert by a transfer hydraulic cylinder for work rolls, transported to the roller grinding workshop on insert, is replaced with a new roll, which is transported to the cage on the insert along rails using a self-propelled trolley and introduced into the cage on the insert with a transfer hydraulic cylinder for working rolls. Boko a KU rim V NE V o This is still: their tya o A ooyuyuyu a nn i a a a a a a KK Finnsseosvtyu and METU I OA oh kv vyky ekv oso oso sosok es Ky 5 ЖЖ npyutt rya: A Shrek as Shveya pe ECO IN: With no PY M M po eni " E o : : ten : I Ian 1 piki i slya shchi - dovyh tsaiy ih sli dme KOYU u r UVK proe N SHUM Shipyvihi, U PKVYA B i 2.23 N OUR OI PERSONS memvuyemeyuvyv pnn S M mitin nin in M M p o s p o s pazh v o I U i zh Don now knowledge of melanin nn ChiNg. 2 OBO! POLO! Жав ШЕ DYCHINY be Ш passed and pa 5 НН vyp v nama a ZU EK ZHEN MK n ZENYK