Core rod supporting rack for continuous mill

Abstract

A mandrel supporting rack for a continuous mill comprises a rack body, three roller frames are hinged to the rack body through pin shafts, the roller frames are rotationally connected with supporting rollers, and driving shafts are fixed to the roller frames and clamped in strip-shaped grooves or strip-shaped holes of movable beams. An n-shaped movable beam is slidably connected to the rack, a left top beam is fixed to the left side of the movable beam, a right top beam is fixed to the right side of the movable beam, and a left hydraulic cylinder is fixed to the left portion of the rack. Compared with the prior art, the utility model has the technical effects that the three supporting rollers can be simultaneously adjusted by arranging one movable beam, and the adjusting precision is higher.

Description

Technical Field

[0001] This utility model belongs to the field of rolled seamless steel pipe technology, specifically relating to a mandrel support frame for a continuous rolling mill. Background Technology

[0002] Currently, in the continuous rolling production equipment of seamless steel pipes in metallurgical enterprises, the continuous rolling mill is one of the main pieces of equipment for seamless steel pipe production. The mandrel support device is installed between the stands of the continuous rolling mill to support the mandrel (see patent document CN102873101A). The mandrel support device generally consists of three support rollers. When the support rollers are clamped, they support the mandrel and prevent the rolls from scratching it; when the support rollers are open, the tube can pass through smoothly.

[0003] The technical problem is that it is not easy to synchronize the rotation (adjustment) of the support rollers, resulting in a decrease in accuracy. Utility Model Content

[0004] The technical problem to be solved by this utility model is: how to design a mandrel support frame for a continuous rolling mill that facilitates control of the rotation of the support rollers.

[0005] The specific technical solution of this utility model is as follows:

[0006] A mandrel support frame for a continuous rolling mill includes a frame with three roll frames hinged to it via pins. Each roll frame is rotatably connected to a support roll. A drive shaft is fixed on the roll frame and engages in a slot or hole in a moving beam. A U-shaped moving beam is slidably connected to the frame. A left top beam is fixed to the left side of the moving beam, and a right top beam is fixed to the right side. A left hydraulic cylinder is fixed to the left side of the frame, with its output shaft contacting the left end of the left top beam. A right hydraulic cylinder is fixed to the right side of the frame, with its piston end contacting the right end of the right top beam. A protrusion is fixed to the piston end of the right hydraulic cylinder, and a position sensor is fixed to the cylinder body end of the right hydraulic cylinder, with its measuring end engaging with the protrusion. The position sensor is connected to a PLC, which in turn connects to the left and right hydraulic cylinders.

[0007] The left and right top beams are in a straight line.

[0008] Compared with the prior art, the technical advantage of this utility model is that it has a movable beam that can adjust three support rollers at the same time, and the adjustment accuracy is high. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the present invention.

[0010] Figure 2 This is an enlarged schematic diagram of the drive shaft. Detailed Implementation

[0011] The present utility model will be introduced in detail below in conjunction with the attached drawings and its specific embodiments.

[0012] As Figure 1-2 , a mandrel support frame for a continuous rolling mill includes a frame 10. The frame 10 is hinged to three roll frames 19 through a pin shaft 12. The roll frames 19 are rotatably connected to support rolls 11. A drive shaft 13 is fixed on the roll frames 19, and the drive shaft 13 is stuck in a strip groove 18 or a strip hole 17 of a moving beam 20.

[0013] A "U"-shaped moving beam 20 is slidably connected to the frame 10. A left top beam 21 is fixed to the left side of the moving beam 20, and a right top beam 22 is fixed to the right side of the moving beam 20. A left hydraulic cylinder 30 is fixed to the left part of the frame 10, and the output shaft of the left hydraulic cylinder 30 contacts the left end of the left top beam 21. A right hydraulic cylinder 40 is fixed to the right part of the frame 10, and the piston end of the right hydraulic cylinder 40 contacts the right end of the right top beam 22.

[0014] A convex block 42 is fixed to the piston end 41 of the right hydraulic cylinder 40, and a position sensor 43 is fixed to the cylinder body end of the right hydraulic cylinder 40. The measuring end of the position sensor 43 cooperates with the convex block 42.

[0015] The position sensor 43 is connected to a PLC (not shown in the figure), and the PLC is connected to the left hydraulic cylinder 30 and the right hydraulic cylinder 40.

[0016] For stability, the left top beam 21 and the right top beam 22 are on the same straight line.

[0017] Its working principle is as follows:

[0018] S1. The piston end of the left hydraulic cylinder 30 retracts to the limit, the piston end of the right hydraulic cylinder 40 extends to the limit, and the piston end of the right hydraulic cylinder 40 pushes the moving beam 20 to move to the left. The moving beam 20 drives the three roll frames 19 to rotate counterclockwise synchronously around the pin shaft 12 through the drive shaft 13, and the space between the three support rolls 11 expands to the maximum, which is sufficient for the capillary tube to pass through. Moreover, the capillary tube only passes through and no other processing is performed. Even if the space between the three support rolls 11 is relatively large, it has no impact on the "capillary tube passing through". Therefore, the PLC does not need to work in this stage.

[0020] S2. Clamping the mandrel

[0021] Because the mandrel needs to roll steel, it needs to be tightly held by the support rolls 11. However, it cannot be held too tightly, otherwise the surface of the mandrel will be damaged. Moreover, the mandrel has different models.

[0022] Therefore, every time a new model of mandrel is replaced, the parameters of the PLC need to be adjusted.

[0023] ​​​As the mandrel passes through, the piston end of the left hydraulic cylinder 30 gradually extends, and the piston end 41 of the right hydraulic cylinder 40 gradually extends, pushing the moving beam 20 to move to the left. The three roller frames 19 rotate clockwise around the pin shaft 12 in sync. When the position sensor 43 measures the appropriate position of the piston end 41 of the right hydraulic cylinder 40, the two hydraulic cylinders stop, and the three roller frames 19 rotate clockwise to the appropriate position. The space between the three support rollers 11 is just right, which can properly hold the mandrel.

[0024] For other details, please refer to the existing technology.

[0025] The above description is only a preferred embodiment of the present utility model. It should be noted that those skilled in the art can make several changes and improvements without departing from the overall concept of the present utility model, and these should also be considered within the protection scope of the present utility model.

Claims

1. A mandrel support frame for a continuous rolling mill, comprising a frame (10). The frame (10) is hinged to three roll frames (19) through a pin shaft (12). The roll frames (19) are rotatably connected to support rolls (11). A drive shaft (13) is fixed on the roll frames (19). It is characterized in that: The drive shaft (13) is stuck in a strip groove (18) or a strip hole (17) of a moving beam (20); A "C"-shaped moving beam (20) is slidably connected to the frame (10). A left top beam (21) is fixed to the left side of the moving beam (20). A right top beam (22) is fixed to the right side of the moving beam (20). A left hydraulic cylinder (30) is fixed to the left part of the frame (10). The output shaft of the left hydraulic cylinder (30) contacts the left end of the left top beam (21). A right hydraulic cylinder (40) is fixed to the right part of the frame (10). The piston end of the right hydraulic cylinder (40) contacts the right end of the right top beam (22); A convex block (42) is fixed to the piston end (41) of the right hydraulic cylinder (x). A position sensor (43) is fixed to the cylinder body end of the right hydraulic cylinder (40). The measuring end of the position sensor (43) cooperates with the convex block (42); The position sensor (43) is connected to a PLC. The PLC is connected to the left hydraulic cylinder (30) and the right hydraulic cylinder (40).

2. The mandrel support frame for continuous rolling mill as described in claim 1, characterized in that: The left top beam (21) and the right top beam (22) are on the same straight line. It should be noted that in the original text, "右液压缸(40)的活塞端(41)固定凸块(42),右液压缸(40)的缸体端固定位置传感器(43)" has an unclear "右液压缸(x)" which may be a typo. I translated it as "右液压缸(40)" according to the context. If this is incorrect, please provide the correct information.

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