JPS6068105A - Rolling installation of steel pipe - Google Patents

Abstract

PURPOSE:To obtain a titled installation capable of rapidly and accurately forcing-in and takeing-out a mandrel bar by constituting the installation wherein a tension head, engaged with a mandrel travelling carriage by a clamp claw and a clamp hook, is moved by a pinion and a rack. CONSTITUTION:A tubular blank material 1 heated by a heating furnace 101 is set to a material receiving table 102. Next, a mandrel carriage 5 is advanced at high speed by a chain 16, to insert a mandrel bar 3, fixed to the front end of carriage 5 through a clam head 9, into the tubular blank pipe 1. The carriage 5 is advanced to the prescribed position of a tension head 19, and then is allowed to move by inertia till it is stopped by a buffer device (not shown in the figure) of the head 19 by turning off the switch of a chain driving device 17. Next, the carriage 5 is engaged with the head 19 by a clamp claw and a clamp hook (not shown in the figure), and is advanced by a driving device 36 through a pinion 34 and a rack 22, to bite and roll the tubular blank material 1 into a seamless steel pipe 2 by a continuous mill 103.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an improvement in rolling equipment for rolling a heated, flattened tubular material by inserting a mandrel bar into the continuous mill and rolling the material.

(Prior Art) In the conventional Nomandrel bar rolling method, guiding of the tubular material to the rolling mill, rolling control, and pulling out of the mandrel bar are mainly carried out by a mandrel cart and a tension head. The mandrel running platform is moved by a chain drive device, and the tension head is operated by a hydraulic cylinder. At the start of rolling, the mandrel running trolley uses the attached mandrel bar as a tubular material.
It is necessary to dock with the tension head in the i+n state, but at this time, the running of the mandrel traveling cart is temporarily stopped at a position close to the tension head by the command of the limit switch, and the tension head is moved back at a low speed to become one body. and stop. At the same time, after hooking the clamp hook on the tension head side to the claw of the mandrel carriage, the tension head pulls the mandrel carriage and moves forward, causing the rolling mill to engage the tubular material that has passed through the mandrel bar.

In the above-mentioned operation, it takes time to guide the tubular material to the start of rolling, which causes rolling defects due to a drop in rolling temperature. Furthermore, the efficiency of rolling operations could not be improved. Furthermore, since the tension head is operated by a hydraulic cylinder,
The mandrel bar vibrated during rolling, making it impossible to perform optimal rolling.

(Objective of the invention) A mandrel bar is a rolling jig for manufacturing seamless steel pipes, and it determines the entire inner diameter of the steel pipe and finishes the inner surface.In order to perform optimal rolling, the mandrel bar is Need to adjust speed. Also, after rolling is completed,
It is necessary to rapidly remove the mandrel bar from seamless steel pipe.

The present invention improves the accuracy and strength of the mandrel bar tension control device by driving the entire rack and pinion drive of the running section.Furthermore, in order to increase the moving speed of the mandrel bar during rolling operations, the tension head is equipped with a shock absorbing device and is capable of moving up and down, for example, rotating. The present invention provides a device in which a crank pawl is formed, a stopper is provided on a mandrel cart, and a clamp hook is provided on a clamp head disposed on the mandrel cart, and the drawbacks of the conventional hydraulic cylinder movement method are improved. The pushing and pulling operations of the mandrel bar are carried out quickly and accurately (1.), which improves rolling capacity and quality.

(Structure of the invention) An embodiment of the present invention will be described below.

A running wheel 6 and a guide roller 7 are rotatably fixed to the mandrel cart 5, and a clamp head 8.9 is fixed to the tip. Due to this fixation, the mandrel bar 4 shown in FIG. 4 is removably clamped to the clamp head 8. The mandrel bar 3 illustrated in FIG. 6 is fixed to a joint iron 14 clamped to a clamp head 9, and can be replaced depending on the rolling method. In Fig. 4, the clamp head 8 has a clamp hook 12 and a strut horn ζ-.
13 is fixed to the clamp head 9 in FIG. 6 IC, and a clamp hook 12' and a straight hook J3' are fixed to the clamp head 9.

In Figures 1 to 3, the mandrel cart 5 is moved by:t.
A running wheel 6 and a guide roller 7 are engaged with the running rail 15 so as to be freely runable and are connected by a chain 16, and are driven back and forth within the running rail 15 by driving the chino 16 by a chino drive device 17. Running rail] 5 is running surface 15
a and the guide surface] 8, (the tension head 190 described in i-, the running surface 158' and the guide surface 18' are also provided on the rear part. It is freely fixed, and a rack 22 is fixed to the upper surface.

A connecting engagement portion path with the mandrel traveling carriage 5 is provided at the tip end. It is the insertion hole 2 of clamp head 8, 9.
A head portion 24 having a full length 4' is connected to the clamp claw 5 rotatably by a bottle 26, and the clamp claw δ is connected to a separately installed lifting device such as a liquid or pneumatic cylinder 27 and a bottle path to move the cylinder. The operation allows vertical amplitude operation. A shock absorbing device 29 is fixed to the head 241 to cushion a collision when connected to the mandrel truck 5.

Further, a V roller 30 is rotatably fixed to a bracket 31 at the outlet 1 of the insertion hole 24', and the bracket 31 is fixed to the outlet 1 of the insertion hole 24' with a screw 3.
2.It is installed so that it can be adjusted up and down.

The tension head 19 is driven by the rotation (
It is done more. The pinion 34 is connected to the coupling 35 ((
(Operation of the Invention) The present invention can be operated in two ways, but first, the heated tubular material 1 and the mandrel bar 3 are inserted into the fully continuous mill 103, and the mandrel bar A case of a rolling method in which the rolling speed is arbitrarily adjusted by constraining the rolling speed will be explained. A tubular material 1 is extracted from a heating furnace 101 and set in a material receiving channel 102. Next, the mandrel cart 5 is moved forward from the rear standby position at high speed by driving the chino 16, and is inserted into the entire tubular material 1 of the mandrel bar 3 fixed to the clamp head 9 fixed to the tip. When the mandrel cart 5 advances to a predetermined position on the tension head 19, the built-in clutch of the chain drive device 17 is disconnected by a command from a limit switch (not shown), and the mandrel cart 5 is coasted and fixed to the tension head 19. At the same time as the shock absorber 29 is caused to stop the collision, the pneumatic cylinder 27 is actuated by a limit switch (not shown) to engage the clamp hook 12 with the mandrel cart 5 and the tension spatula 192.

The engagement is confirmed by the limit switch (not shown) of the pneumatic cylinder 27, and the tension head is activated by the signal from this.]9
The drive device 36 drives the coupling 35 and the pinion 34 to start moving forward. At the same time, tubular material 1
is fed into the continuous mill 103 and rolled.

When the seamless steel pipe 2 that has been rolled is removed from the continuous mill 103, the tension head 19 is stopped in response to a command from a detector (not shown) that detects this. (Here, the seamless 7 steel pipe 2 is skewered to the mandrel bar 3, so it must be pulled out.) At the same time, the steel pipe separation stopper 104 is also closed, and the tension is applied by a signal from its limit switch (not shown). The drive unit 36 of the head 19 moves the pinion 34 in reverse while the mandrel cart 5 and the tension head 19 are force-engaged, and then pulls out the seamless steel pipe 2 to the mandrel bar 3 via the steel pipe separation stopper 104* and applies tension. The head 19 is retreated to the standby position. At this time, a command to release the clamp claw 5 is issued to the pneumatic cylinder 27 at the same time as a command to retreat the tension head 19, and the hook is released. When the retracted position is reached, the chain drive device j7 is reversed by a command from a limit switch (not shown), and the chain 16 is reversely fed, so that the mandrel cart 5 is retracted to the standby position and stopped. The mandrel bar 3 moves forward and backward integrally with the mandrel cart 5, but since it has an elongated shape, it bends greatly when laid on its side. To prevent this, the undulating VD-ra 37 is placed at regular intervals on the IC inside the running rail 15. When the installed mandrel cart 5 and tension head 9 are running, each operating pneumatic cylinder 38 is activated in advance by a command from a limit switch (not shown) attached to the running rail 15 so as not to interfere. The V-row 237 is lowered one after another through all levers 40 so as not to interfere with driving. When the mandrel cart 5 and the tension head 19 return to their standby positions, these V rows 237 also rise to support the mandrel bar 3.

Next, a method will be described in which the heated tubular material 1 and the mandrel bar 4 are inserted into the fully continuous mill 103, and at the same time, the restraint of the mandrel bar 4 is released and the material is rolled together.

A tubular material 1 is completely extracted from the heating furnace 101 and a material receiving table 102 is set. Next, mandrel cart 5 whole chain 1.6'? : The clamp metal fitting 11 of the crank head 8 is driven and moved forward from the rear standby position at high speed and fixed at the tip.
When the mandrel bar 4 clamped by the mandrel bar 4 is inserted into the tubular material 1 and the tip of the mandrel bar 4 reaches a predetermined position, the chain drive device is stopped by a limit switch (not shown) and the mandrel cart 5 is stopped. At the same time, the pneumatic cylinder/der 10i is operated to unclamp the clamp hardware 1. The mandrel bar 4 and the tubular material 1 are placed on a vinyl roll (not shown) V on the material receiving table 102.
r h to the party h 4 times the work w (I don't understand and is bitten out to the conical surface.

During this rolling, the chain drive device 17 is driven to move the mandrel truck 5 forward, and at a predetermined point on the tension head 9, a built-in clutch in the chain drive device 17 is disconnected by a command from a limit switch (not shown) to move the mandrel truck forward. 5 is allowed to coast and is stopped by colliding with the shock absorber 29 fixed to the tension head 19. At the same time, the pneumatic cylinder 27 is fully operated by the limit switch (f not shown), and the clamp claw 25 is fully hooked onto the clamp hook 12, and the mandrel is The trolley 5 and the tension head 19 are brought into engagement. The engagement is confirmed by a limit switch (not shown) of the pneumatic cylinder 27, and in response to the signal from this, the drive device 3G of the tension head I9 is driven to move the tension head I9 forward via the coupling 35 and the pinion 34, and the leading mandrel bar 4 is moved forward. When the end of the is in the clamp position of the crank head 8, the limit switch (
(not shown), the pneumatic cylinder 10 is operated to clamp the mandrel bar 4 with the clamp hardware 1]. Meanwhile, the mandrel cart 5 and the tension head 19 move forward while being engaged, and when the end of the seamless steel pipe 2 skewered on the mandrel (z bar 4) passes the steel pipe separation stopper 104, the tension head 19 is driven by a command from the detector. The device 36 stops and the tension head 19 stops.At this time, the steel pipe separating stop bar 104 is also closed at the same time, and a signal from a limit switch (not shown) of this causes the tension head 19 drive device 36 to reverse the pinion 34. Then, with the mandrel cart 5 held in place, the tension head 19 runs in the opposite direction, and removes the mandrel steel pipe separation stopper from the seamless steel pipe 2.
1042 and retreat to the standby position of the tension head 19. At this time, simultaneously with a command to retreat the tension head 19, a command to release the clamp claw 5 is issued to the pneumatic cylinder 27, and the hook is released. When the reverse position fK is reached, the chain drive device j7 is reversely operated in response to a command from a limit switch (not shown), and the chain 16 is reversely fed, so that the mandrel truck 5 is retreated to the standby position and stopped.

(Effects of the Invention) Since the tension control device for the mandrel lever is driven by a rack and pinion, the accuracy and strength of the running section are improved.

The tension head is equipped with a shock absorber and a crank claw that can be raised and lowered, and a mandrel bar is equipped with a stopper and a crank hook is placed on the clamp head placed on the mandrel bar to quickly and accurately push in and pull out the mandrel bar. The effect of improving rolling capacity and quality is significant.

[Brief explanation of the drawing]

Fig. 1 is an overall plan view of the present invention, and Fig. 2 is an A-A in Fig. 1.
Line sectional view, Figure 3 is an enlarged cross-sectional view taken along line B-B in Figure 2, Figure 4
The figure shows the clamp head 8 engaged with the mandrel bar 4 cuff lamp and the tension vent 19Vc, and Figure 5 shows how the clamp heads 8 and 9 of the mandrel cart 5 are connected to the tension head 19'K. The state diagram, FIG. 6, is a drawing in which the mandrel joint kg 14 and the mandrel bar 3 are fixed to the clamp head 9 and the tension spatula l' 191F is engaged. 1... Tubular material, 2... Seamless steel pipe, 3... Threaded mandrel bar at the mounting part 14... Middle part of the mounting part is a
(Mandrel bar 15... Mandrel cart, 8... Clamp head (for clamping and unclamping mandrel bar 4), 9... Clamp head (for completely fixing mandrel bar 3), 11.・−
Clamp hardware, 12... Clamp hook, 13...
- Stroller 115 - Traveling rail, 16... Chain, 17... Chain drive device, 19... Tension head, 22... Rack, Separate... Head part,
5. Clamp claw, 27.-Cylinder, 29.
-Buffer device, 30...V roller, 33...pinion stand, 34...pinion, 35...coupling, 36...drive reduction device, 40...undulation V'0
101...Heating furnace, 102...Material receiving table, 103...One continuous mill, 104...-Steel pipe separation stopper. Representative Patent Attorney Tomoyuki Yabuki 1 person 7-3 Figures 1, 4 Page 1 Figure 5 Figure 6

Claims (1)

[Claims] Clamp head 8.9 arranged on the mandrel traveling trolley 5
Attach the mandrel bars 3 and 4 to the clamp head 8,
9 is supported by a tension head, the mandrel bars 3 and 4 are fully inserted into the tubular material, and the tubular material is bitten by a continuous mill.In equipment for rolling steel pipes, a rack that engages with the pinion is provided on the top surface to enable horizontal movement. A shock absorbing device 29 is disposed on the tension head 9, and a crank claw member 25 is provided on the tension head, and is connected to the crank claw member total lifting device so that the crank claw member 25 can be fully raised and lowered. A steel pipe rolling equipment characterized in that a clamp hook is provided on a stopper on a truck and is completely fixed on a clamp head arranged on a mandrel truck, with a crank claw member being removable.