Roll change system of sizing mill

Abstract

The invention discloses a roll change system of a sizing mill. The roll change system comprises a plurality of racks, a track device, a first roll change trolley, a second roll change trolley and a push-pull roll change device, wherein the track device comprises two parallel tracks; both the first and second roll change trolleys are arranged on the track device in a walking manner; a plurality of first stop dogs are fixedly arranged on the first roll change trolley; pressing rolls are arranged at the upper parts of the first and second roll change trolleys; the push-pull roll change device comprises a table frame, a sliding frame, one or more hydraulic cylinders and a plurality of push-pull hooks; each push-pull hook comprises two hook heads which rotate synchronously, a first hook tail and a second hook tail; the hook heads are matched with clamping hooks on the racks; the first hook tails are matched with the first stop dogs; and the second hook tails are matched with second stop dogs. According to the invention, through the matching between the first hook tails are and the first stop dogs, the clamping connection between the hook heads and the clamping hooks can be automatically realized, and through the matching between the second hook tails and the second stop dogs, and the unhooking between the hook heads and the clamping hooks can be automatically realized, so that the roll change efficiency is high.

Description

technical field [0001] The invention relates to a sizing machine, in particular to the roll changing structure of the sizing machine. Background technique [0002] The sizing machine is used to sizing the steel pipe. In the sizing machine, a series of roll groups with different rolling sizes are used to roll the steel pipe. A group of roll groups is usually 3, all fixed in a frame, and a sizing machine is used to roll the steel pipe. The sizing mill usually includes 24 racks, through the series rolling of steel pipes, and finally meets the sizing requirements. Steel pipes of different specifications need to use different series of roll sets for rolling and sizing, and therefore need to use different stands (rolls and stands are replaced as a whole), and the stands with roll sets are usually relatively large and heavy, and need to be replaced. The roll changing trolley also needs to be equipped with a special push-pull roll changing device to pull out or push multiple (usual...

AI Technical Summary

Problems solved by technology

[0009] When pushing the new frame, the new frame 2 is first loaded onto the second roll changing trolley 42 by lifting equipment, and at this time the first roll changing trolley 41 leaves the roll changing position corresponding to the rolling position of the sizing machine 1, and the second Second, the roll-changing trolley 42 is loaded with the new frame 2 and stops after arriving at the roll-changing position, starts the hydraulic cylinder 64, and the piston rod 642 drives the sliding frame 62 to slide towards the sizing machine 1 direction on the stand 61, and is positioned at the front of the sliding frame 62 ( That is, toward the direction of the sizing machine 1) and the push head 63 located below the hook head pushes the lower end surface of the hook 20, (at this time, the hook head is opened as far as possible upwards, and does not touch the hook 20 on the frame 2, but it is very possible It rotates under the action of its own weight, and is locked together with the hook 20. If it is locked together, it needs to be manually unhooked after the frame is in place) so that 24 frames 2 gradually enter from the upper end surface of the second roller changing trolley 42. Go to the rolling position of sizing mill 1 and stop when it is in place

[0010] In the process of pulling out the old rack 2 and pushing in the new rack 2, manual clamping and unhooking are required. Due to the large number of hooks 20 and hook heads, this work is very cumbersome, especially after the old rack 2 is pulled out When performing unhooking operation, because the hook head and the grab hook 20 cooperate very closely under the action of tension, it is very difficult to use tools to complete it, which requires a lot of manpower, and the efficiency is extremely low, and the operator is easily injured. 20 is also highly susceptible to damage

Therefore, the roll changing process of the existing sizing machine 1 roll changing system is long, which seriously affects the production efficiency of the sizing machine

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