JP3135096B2 - Crankshaft rotation control mechanism in snip shear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a snip shear provided on an electroplating line for plating a strip, for example, for cutting while running the strip and simultaneously switching paths. The present invention relates to a rotation control mechanism for a crankshaft provided in a vehicle.

[0002]

2. Description of the Related Art In an electroplating line in which a strip of a steel sheet is electroplated, the strip after plating is cut into a predetermined length and then wound into a coil.
In the cutting of such a strip, a running cut in which the strip is sheared while running without stopping is performed,
In the case of an electrotin plating line, a snip shear is used.

This snip shear has a shearing blade connected to a crankshaft rotated by a driving system, and has a mechanism for raising and lowering the shearing blade by rotating the crankshaft. It is possible to move at a peripheral speed equal to the traveling speed. Then, the strip after each shearing is switched to the upper pass and the lower pass, respectively, and travels to the tension reel downstream.

[0004] When the traveling strip is sheared, after the shear position has passed, the ascending and descending of the shearing blade is stopped and stopped until the next shear position is reached. This is a standby due to the stoppage of the rotation of the crankshaft, and the crankshaft is driven to rotate again when the next shear position is reached.

[0005] In such an operation, control of the stop position of the shearing blade by the stop posture of the crankshaft is very important for strip passing property. The reason is that the strip when the shear blade is stopped passes between the upper shear blade or the lower shear blade and the fixed shear blade, and if the stop position of the shear blade is shifted, the distance between the blades is reduced. The gap becomes small, and the strip and the shearing blade come into contact with each other, causing a flaw in the strip or making it impossible to pass through the strip.

Conventionally, the stop position of a shearing blade is controlled by combining an air clutch and an air brake included in a rotation transmission system of a drive system, and stopping the rotation posture of a crankshaft at a preset position by these operations. I was trying to make it. The operation of these air clutches and air brakes utilizes a cam limit that mechanically detects the rotation angle of the crankshaft and outputs an electric signal.

[0007]

The stop position of the shearing blade of the snip shear changes due to fluctuations in the pressure of the air brake and fluctuations in the coefficient of friction between the center plate and the friction disk. For this reason, it is necessary to repeatedly perform fine adjustment when installing the equipment.

However, in the conventional cam limit system,
Because of the mechanical adjustment of the position of the cam, fine adjustments are quite difficult and often take a relatively long time. Also,
When changing the running speed of the strip, the gear ratio of the continuously variable transmission must be manually adjusted at the same time as the rotation of the crankshaft is adjusted by the cam limit, and similarly, the line must be stopped for a long time. Become.

Further, there is a conventional apparatus having a continuously variable transmission, but after setting a constant speed ratio, the apparatus is operated at this speed without changing the threading speed.

[0010] On the other hand, when the amount of plating is small, the energization time in the plating solution is shorter than when the amount of plating is large. However, since the cutting speed is set to a slower side in preparation for the passing of a strip with a large coating weight, the operation is performed with the cutting speed set to a low side. Will occur.

The problem to be solved in the present invention is that the setting of the rotational position of the crankshaft and the change of the rotational speed can be easily performed, and the change of the strip passing speed can be immediately coped with.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a snip shear in which a shearing blade connected to a crankshaft is oscillated with a peripheral speed corresponding to a running speed of a strip to be passed. includes a clutch and brake mechanism to place the transmission system between the crankshaft and the rotating <br/> translocation transmitter of the crankshaft, a rotational position detector, and a CPU unit, the rotational position transmitter Gives the crankshaft rotational position signal
Always send to the rotational position detector, the rotational position detector,
Crankshaft is pre-programmed according to threading speed
When the rotation position is reached, the crankshaft stops at the set stop position.
Input a command to the CPU device to stop the
Receives this command and sets the stop position of the crankshaft.
The signal is input to the clutch and brake drive system,
The axis stops rotating at the set stop position.
Characterized in that was.

Further, a continuously variable transmission may be provided on the drive source side, and a system for varying the speed ratio of the continuously variable transmission according to the condition of the strip passing speed may be provided.

[0014]

Since the control of the crank and the brake mechanism when stopping the crankshaft is performed based on the signal from the rotational position detector, the control system is provided with a program corresponding to conditions such as the strip passing speed in advance. If so, the crankshaft can be set to an appropriate stop position for each condition.

If the speed ratio of the continuously variable transmission is controlled so as to be changed in accordance with the plate speed, the rotation of the crankshaft is also increased and reduced, and the speed of the shearing blade during shearing is reduced. It is possible to quickly cope with a change in threading speed during line operation.

[0016]

FIG. 1 is a schematic view showing a shear mechanism of a snip shear.

In the figure, a fixed shearing blade 2 is disposed and a tool post 3 is provided inside a main body frame 1 through which a strip 50 passes, and the tool post 3 is provided with an upper shearing blade 3a and a lower shearing blade 3b. The lower end of the main body frame 1 is connected to the first crankshaft 4 by a connecting rod 4a, and the lower end of the tool rest 3 is also connected to the second crankshaft 5 by a connecting rod 5a. The rotation of the first and second crankshafts 4 and 5 causes the main body frame 1 and the tool rest 3 to swing up and down independently of each other, and by adjusting the timing thereof appropriately, the fixed tip blade 2
Then, the strip 50 is sheared by the upper and lower shearing blades 3a and 3b.

FIG. 2 is a schematic diagram showing a drive system for the first and second crankshafts 4 and 5.

A continuously variable transmission 7 is connected to a drive motor 6 arranged as a drive source, and the continuously variable transmission 7 has a pilot motor 7a externally connected to a built-in transmission mechanism. The pilot motor 7a is for changing the reduction ratio of the transmission mechanism, and automatically controls the strip 50.
It has a function that enables the reduction ratio to be changed so that the cutting speed corresponds to the passing speed.

A speed reducer 8 is connected to the output side of the continuously variable transmission 7, and an air clutch 9 and an air brake 10 are incorporated between the speed reducer 8 and the first crankshaft 4, respectively. Then, the second crankshaft 5 is connected to the first crankshaft 4 by the reduction gear 11, and these first and second crankshafts 4, 5 are connected.
Can be rotated synchronously.

In such a drive system, the air brake 10
Is turned off and the air clutch 9 is connected, and the drive motor 6 is operated, so that the first and second crankshafts 4 and 5 rotate in synchronism, and the fixed shearing blades as described with reference to FIG. The strip 50 is sheared by 2 and the upper and lower shearing blades 3a and 3b.

A rotational position transmitter 12 for constantly monitoring the rotational position of the first crankshaft 4 is provided, and a rotational position detector 1 receiving a detection signal from the rotational position transmitter 12.
3 and a CPU device 14.

The rotation position detector 13 is a rotation position transmitter 1
2 is always received, and when the angle reaches a pre-programmed angle, the signal is input to the CPU device 14. In addition, a program corresponding to the required threading speed is input in advance, and the strip 50 is started from the stop position of the first crankshaft 4 to shear the strip 50, and the original Make sure to match the position.

The CPU 14 includes a rotational position detector 13
A command for stopping the first crankshaft 4 so as to reach the stop position set by the command is input. Then, the CPU device 14 inputs a signal for setting the stop position of the first crankshaft 4 to the drive system of the air clutch 9 and the air brake 10, and the timing of disengaging the air clutch 9, the timing of braking by the air brake 10, and Control that time.

In the above configuration, when the strip 50 is passed, the rotation speed and the stop position of the first crankshaft 4 are controlled and determined according to the passing speed so that the strip 50 to be cut has a predetermined length.

In this control, the rotation of the first crankshaft 4 is controlled by changing the speed ratio of the continuously variable transmission 7 with respect to a constant rotation speed of the drive motor 6, and in this operation, The gear ratio is set to a predetermined value by the pilot motor 7a.

Further, the operation of the air clutch 9 and the air brake 10 is controlled such that the stop position of the first crankshaft 4 is set to a rotational position set by the rotational position detector 13 in advance. This control is executed so that the rotational position is set by the rotational position detector 13 in accordance with conditions such as the passing speed.

As described above, the rotation position of the first crankshaft 4 is adjusted by the position detection by the rotation position transmitter 12 and the position setting by the rotation position detector 13. For this reason,
Compared to the conventional one using cam limit,
It is possible to accurately set the stop position of the first crankshaft 4 in a short time. Then, even when the passing speed is changed during the operation of the line, the setting of the stop position of the first crankshaft 4 can be easily changed by a program corresponding to this, and the operation can be performed without stopping the passing.

Further, the speed ratio of the continuously variable transmission 7 can be independently changed without being connected to the passing plate line, and the rotation speed of the first crankshaft 4 can be freely changed. For this reason, in the past, the strip passing speed was set to a constant value corresponding to a large plating adhesion amount, whereas in the case of a small plating adhesion amount, the rotation of the crankshaft 4 corresponding to the speed increase was performed for a strip having a small plating adhesion amount. To improve the processing efficiency for strips with a small amount of plating.

In the embodiment, the rotational position of the first crank 4 is detected. However, the rotational position of the second crank shaft 5 rotating in synchronization with the first crank shaft 4 is detected, and It goes without saying that the control may be executed.

[0031]

According to the present invention, the stop position of the crankshaft can be easily set and changed in a short time, so that the stop time of the line can be shortened and the productivity can be improved. Also, if the speed ratio of the continuously variable transmission can be changed, the rotation speed of the crankshaft can be changed freely, and it is possible to cope with a line where the strip passing speed changes variously.

[Brief description of the drawings]

FIG. 1 is a view schematically showing a shear mechanism of a snip shear of the present invention.

FIG. 2 is a diagram schematically illustrating a drive system from a drive source to a crankshaft and a lower shear blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body frame 2 Fixed shearing blade 3 Turret 3a Upper shearing blade 3b Lower shearing blade 4 First crankshaft 4a Connecting rod 5 Second crankshaft 5a Connecting rod 6 Drive motor 7 Continuously variable transmission 7a Pilot motor 8 Reduction gear 9 Air Clutch 10 Air brake 11 Reducer 12 Rotational position transmitter 13 Rotational position detector 14 CPU device 50 Strip

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Hiroshi Wakiyama 46-59 Ohara Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Machinery & Plant Business Department (72) Inventor Shuji Masuda Tobata-ku, Kitakyushu-shi, Fukuoka 46 Nippon Steel Plant Design Co., Ltd. at 46 Nakahara (72) Inventor Minoru Honda 46 Nippon Plant Design Co., Ltd. at 46 Ota Nakahara, Tobata-ku, Kitakyushu, Fukuoka Prefecture (56) References JP-A-59-59 163021 (JP, A) JP-A-52-17283 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23B 25/06 B23B 36/00 503

Claims (2)

(57) [Claims] 1. A transmission between a drive source and said crankshaft in a snip shear in which a shearing blade connected to a crankshaft is oscillated with a peripheral speed corresponding to a running speed of a passing strip. a clutch and brake mechanism to place the system, the rotational position transmitter of the crankshaft, comprising: a rotational position detector, and a CPU unit, the rotational position transmitter is
The rotational position signal of the crankshaft is always sent to the rotational position detector.
Feed, the rotation position detector detects that the crankshaft
When the rotational position is programmed according to the degree,
Command to stop the axis at the set stop position
Input to the U device, the CPU device receives this command,
The signal for setting the stop position of the
Input to the key drive system and set the crankshaft to the set stop position.
A rotation control mechanism for a crankshaft in a sniper , wherein the rotation is stopped . 2. The system according to claim 1, further comprising a continuously variable transmission provided on the drive source side, wherein a speed ratio of the continuously variable transmission is made variable in accordance with a condition of a strip passing speed of the strip. A rotation control mechanism of a crankshaft in the snip shear described in the above.