JP2010149252A - Method for adjusting zero point of crankshaft of snip shear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for adjusting the zero point of a crankshaft of a snip shear surely adjusting the zero point of the crankshaft in both cases of normal operation and return of power of the snip shear. <P>SOLUTION: A proximity sensor 13 with the detection range of ±b° is installed in the position of a° in the reverse rotational direction from the home position 11 of the crankshaft 4, and a bracket 17 of a fan shape with the center angle of c° is attached to the crankshaft 4 for the proximity sensor 13. In normal operation of the snip shear, when the proximity sensor 13 effects ON-detection, the zero point is adjusted by rotating the crankshaft 4 forward from the position by (a+b)° and stopping it, whereas in return of power of the snip shear, the crankshaft 4 is rotated forward, and when the proximity sensor 13 effects OFF-detection, the zero point is adjusted by reversely rotating the crankshaft 4 from the position by (c-(a-b))° and stopping it. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention adjusts the rotational position of the crankshaft to a predetermined origin position (zero point position) in a sniper that is provided in an electroplating line, a continuous annealing line, etc. and shears while running a strip and simultaneously switches paths. It is related to the zero tuning method.

  The electroplating line, continuous annealing line, and the like are provided with snip shears that perform path switching at the same time as shearing while the strip is running.

  As shown schematically in FIG. 3, the sniper has a fixed shear blade 2 and a tool post 3 inside a body frame 1 through which the strip 50 passes, and the tool post 3 has an upper shear 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 post 3 is similarly connected to the second crankshaft 5 by a connecting rod 5a. When these first and second crankshafts 4 and 5 are rotated by a motor through a speed reducer, the main body frame 1 and the tool post 3 are independently swung upward and downward, and the timing thereof is adjusted. When appropriate, the strip 50 is sheared by the fixed shear blade 2, the upper shear blade 3a, and the lower shear blade 3b.

  In such a sniper, the rotation position of the crankshaft is usually controlled by installing a pulse generator or the like on the motor shaft and setting a predetermined stop position (standby position) suitable for starting shearing as the origin (zero point). The method of detecting the rotation angle (rotation position) of the crankshaft from its origin position (zero point position) is used, but there is a change in the position where the crankshaft actually stops rotating due to a speed reducer etc. In order to maintain the accuracy of the rotation angle position control of the crankshaft, it is necessary to appropriately perform zero adjustment (adjustment so that the rotation stop position of the crankshaft coincides with the zero point position).

  Also, when the power of the sniper is turned off once for equipment stop or operator work, and when the power is restored again (when the power is restored), the crankshaft rotation position must be adjusted to zero.

On the other hand, as a technique for detecting the rotational position of the crankshaft and accurately stopping at the origin position, a method of installing a rotational position transmitter and a rotational position detector on the crankshaft is disclosed (for example, a patent). References 1 and 2).
Japanese Patent Laid-Open No. 06-31212 JP-A-10-263919

  However, in the case of the crankshaft rotational position control method described in Patent Documents 1 and 2, it is necessary to install a rotational position transmitter and a rotational position detector on the crankshaft. If the rotational position detector cannot be installed, it cannot be applied.

  Therefore, as a more generally applicable crankshaft zeroing method, a proximity sensor is installed in front of the origin position where the rotational speed decreases (in the reverse rotation direction from the origin position), and during normal operation, strip shearing is performed. A method is conceivable in which zero adjustment is performed based on ON detection of the proximity sensor (change from the OFF state to the ON state) each time.

  However, in the case of this method, there is a problem of zero adjustment when the power of the sniper is once turned off for equipment stop or operator work and then the power is restored again (when the power is restored). That is, when the power of the sniper is turned off, the rotation position of the crankshaft is in the vicinity of the origin position. Therefore, the proximity sensor is in the ON state. Even if an attempt is made to perform zero adjustment based on OFF detection (change from the ON state to the OFF state), the sniper is usually used to prevent reverse rotation of the crankshaft from the origin position as shown in FIG. Since the reverse rotation prevention mechanism (ratchet mechanism) 20 including the spring mechanism 21 and the cam 22 is provided, the reverse rotation from the origin position cannot be performed, and the above zero adjustment cannot be performed. It is. Further, if the crankshaft is rotated forward as it is after the power is restored and zero adjustment is performed based on the ON detection, the strip that has been passed through may be cut.

  The present invention has been made in view of the above circumstances, and in a sniper that performs path switching while shearing while running a strip, a rotational position transmitter and a rotational position detector are installed on the crankshaft. The purpose of the present invention is to provide a sniper crankshaft zeroing method that can accurately perform crankshaft zeroing both during normal operation and when power is restored. is there.

  In order to solve the above-mentioned problems, the present inventors have conducted intensive studies. As a result, a reverse rotation prevention mechanism (ratchet mechanism) is installed on the crankshaft of the snipshire. Although it was not possible to reversely rotate, it was noted that once it was forwardly rotated from the origin position, it could be reversely rotated within the range of forward rotation. That is, when zero adjustment is performed when the power of the snipshire is restored, the crankshaft that is located near the origin position and the proximity sensor is in the ON state is rotated forward, and the proximity sensor detects OFF (from the ON state). After changing to the OFF state), based on the OFF detection, it came to the idea that the crankshaft should be rotated backward to the origin position.

  Based on the above concept, the present invention has the following features.

[1] A zero adjustment method for a crankshaft of a sniper that adjusts the rotation stop position of the crankshaft so as to coincide with a predetermined origin position in a sniper that performs path switching at the same time as shearing while running a strip. ,
A proximity sensor (where a> b) having a detection range of ± b degrees is installed at a position in the reverse rotation direction from the origin position, and the proximity sensor detects the rotational position of the crankshaft. As a fan-shaped sensor bracket, the fan-shaped central angle c degrees is c> a−b and the rotation angle d degrees from the origin position to the shearing start position of the strip is (c− (ab)) <d The fan-shaped sensor bracket is attached to the crankshaft so that when the crankshaft is located at the origin position, the fan-shaped positive rotation side is located at the origin position,
During normal operation of the sniper, when the proximity sensor detects ON, zero adjustment is performed by rotating the crankshaft forward (a + b) degrees from that position and stopping.
When the power of the snipshire is restored, the crankshaft is rotated forward, and when the proximity sensor detects OFF, the crankshaft is reversely rotated by (c- (ab)) degrees from that position and stopped. A zero adjustment method for a crankshaft of a sniper characterized by the following.

  In the present invention, even if a rotational position transmitter or a rotational position detector cannot be installed on the crankshaft of the snipshire, the crankshaft can be accurately obtained both in the normal operation of the snipshire and when the power is restored. Can be zeroed. As a result, the rotation angle position control of the crankshaft can be performed with high accuracy, and the strip can be sheared well.

  An embodiment of the present invention will be described with reference to the drawings.

  The sniper used in this embodiment is the same as that shown in FIG. In other words, the sniper used in this embodiment has a fixed shear blade 2 and a tool post 3 inside the main body frame 1 through which the strip 50 passes, and the tool post 3 has an upper shear blade 3a and a lower shear blade 3a. A shearing blade 3b is provided. 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 post 3 is similarly connected to the second crankshaft 5 by a connecting rod 5a. When these first and second crankshafts 4 and 5 are rotated by a motor through a speed reducer, the main body frame 1 and the tool post 3 are independently swung upward and downward, and the timing thereof is adjusted. When appropriate, the strip 50 is sheared by the fixed shear blade 2, the upper shear blade 3a, and the lower shear blade 3b.

  FIG. 2 is a diagram showing an outline of the drive system of the sniper used in this embodiment. A drive motor 32 as a drive source is connected to the first crankshaft 4 via a speed reducer 31. This drive motor 32 has a control function that causes a shearing speed corresponding to the plate passing speed of the strip 50 according to a command from the CPU device 34. Further, the CPU device 34 has a function of calculating the rotational position of the first crankshaft 4 from the signal from the pulse generator 33 connected to the shaft of the drive motor 32 and the reduction ratio of the speed reducer 31, and using it. A program for stopping the first crankshaft 4 at a predetermined origin position is set.

  In addition, in this embodiment, as shown in FIG. 1, the rotation stop position (standby position) of the first crankshaft 4 coincides with the predetermined origin positions (first origin position 11 and second origin position 12). In order to make adjustments, the proximity sensor (the first proximity sensor 13, the detection range is ± b degrees) from the origin position (first origin position 11, second origin position 12) to the position of a degree in the reverse rotation direction. The second proximity sensor 14) (where a> b is satisfied) is installed, and the first crankshaft 4 is connected to the proximity sensors (first proximity sensor 13 and second proximity sensor 14). A fan-shaped sensor bracket 17 for detecting the rotational position of the first crankshaft 4 is attached.

  The fan-shaped sensor bracket 17 has a fan-shaped center angle c degree of c> ab, and the shear start position (first position) of the strip 50 from the origin position (first origin position 11, second origin position 12). (C− (ab)) <d with respect to the rotation angle d degrees to the shear start position 18 and the second shear start position 19), and the first crankshaft 4 is at the origin position (first origin point). When positioned at the position 11 and the second origin position 12), the fan-shaped side 15 on the positive rotation side is attached so as to be located at the origin position (the first origin position 11 and the second origin position 12).

  An operation for zeroing the first crankshaft 4 in each case during normal operation of the sniper and when power is restored will be described based on the above configuration. Here, a case where zero adjustment is performed so that the rotation stop position (standby position) of the first crankshaft 4 coincides with the first origin position 11 will be described, but the rotation stop of the first crankshaft 4 will be described. The same applies when zero adjustment is performed so that the position (standby position) matches the second origin position 12.

  First, during normal operation of the snip shear, after the strip 50 is sheared by forward rotation of the first crankshaft 4, the side (A end) 15 on the forward rotation side of the fan-shaped sensor bracket 17 is the first origin position. The first proximity sensor 13 detects ON (changes from the OFF state to the ON state) when the position becomes (a + b) degrees in the reverse rotation direction from 11. Then, if the first crankshaft 4 is rotated forward (a + b) degrees from the position where the ON is detected and stopped, the A end 15 of the sensor bracket 17 is positioned at the first origin position 11, and the first crankshaft. 4 rotation stop position (standby position) can be matched with the first origin position 11.

  At this time, as described above, the CPU device 34 calculates the rotational position of the first crankshaft 4 from the signal from the pulse generator 33 connected to the shaft of the drive motor 32 and the reduction ratio of the speed reducer 31. Since the program for setting the first crankshaft 4 to be stationary at the first origin position 11 is set by using this function, the first crankshaft 4 is moved to the first origin by the calculation and control by the CPU device 34. It is possible to stop at the position 11 accurately.

  Next, when the power of the snipshire is restored, the CPU device 34 rotates the first crankshaft 4 located in the vicinity of the first origin position 11 in the forward direction, and the side of the fan-shaped sensor bracket 17 on the reverse rotation side ( The first proximity sensor 13 detects OFF (changes from the ON state to the OFF state) when the (B end) 16 reaches the position of (ab) degrees in the reverse rotation direction from the first origin position 11. At the position where the OFF is detected, the angular position of the A end 15 of the sensor bracket 17 is (c- (ab)) degrees from the first origin position 11, so that the first crankshaft 4 is ( c- (a−b)) degree of reverse rotation and stop, the A end 15 of the sensor bracket 17 is positioned at the first origin position 11, and the rotation stop position (standby position) of the first crankshaft 4 is reached. Can be made to coincide with the first origin position 11.

  At this time, the first crankshaft 4 can be accurately stopped by calculation and control by the CPU device 34 as in the normal operation.

  Incidentally, in order for the first proximity sensor 13 to detect OFF in the above-described zero adjustment at the time of power recovery, as a precondition, the time point at which zero adjustment is started (the first position located near the first origin position 11). Since the first proximity sensor 13 needs to be in the ON state at the time when the forward rotation of the one crankshaft 4 is started), the B end 16 of the sensor bracket 17 is detected by the first proximity sensor 13. The fan-shaped central angle c degrees of the sensor bracket 17 is set so that c> ab.

  When starting zero adjustment at the time of power recovery, as a precaution, it is confirmed that the first proximity sensor 13 (or the second proximity sensor 14) is in the ON state, and the ON state is entered. If not, it is preferable to issue an alarm or the like.

  In addition, when the first proximity sensor 13 detects OFF, the angular position (c- (ab)) of the A end 15 of the sensor bracket 17 becomes too large to shear the strip 50. (C− (ab)) <d with respect to the rotation angle d degrees from the first origin position 11 to the first shear start position 18.

  Usually, since the rotation angle d from the first origin position 11 to the first shear start position 18 is about 90 to 110 degrees, (c- (ab)) is set to be about 10 degrees or less. It is preferable to keep it.

  In this way, in this embodiment, even if a rotational position transmitter or rotational position detector cannot be installed on the crankshaft of the sniper, it can be used either during normal operation of the sniper or when power is restored. However, the crankshaft can be automatically and accurately zero-adjusted without requiring a worker or the time required for the operation or by shearing the strip by mistake. As a result, the rotation angle position control of the crankshaft can be performed with high accuracy, and the strip can be sheared well.

It is explanatory drawing of the proximity sensor and bracket for sensors in one Embodiment of this invention. It is a figure which shows the outline of the drive system in one Embodiment of this invention. It is a figure which shows the schematic structure of a sniper. It is a figure which shows the reverse rotation prevention mechanism of a sniper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body frame 2 Fixed shear blade 3 Turret 3a Upper shear blade 3b Lower shear blade 4 1st crankshaft 4a Connecting rod 5 2nd crankshaft 5a Connecting rod 11 1st origin 12 2nd origin 13 1st proximity sensor 14 2nd Proximity sensor 15 A end 16 B end 17 Bracket 18 First shear start position 19 Second shear start position 20 Reverse rotation prevention mechanism (ratchet mechanism)
21 Spring mechanism 22 Cam 31 Reducer 32 Drive motor 33 Pulse generator 34 CPU device 50 Strip

Claims (1)

In a sniper that performs path switching at the same time as shearing while running a strip, a zero adjustment method for the crankshaft of a sniper that adjusts the rotation stop position of the crankshaft to coincide with a predetermined origin position,
A proximity sensor (where a> b) having a detection range of ± b degrees is installed at a position in the reverse rotation direction from the origin position, and the proximity sensor detects the rotational position of the crankshaft. As a fan-shaped sensor bracket, the fan-shaped central angle c degrees is c> a−b and the rotation angle d degrees from the origin position to the shearing start position of the strip is (c− (ab)) <d The fan-shaped sensor bracket is attached to the crankshaft so that when the crankshaft is located at the origin position, the fan-shaped positive rotation side is located at the origin position,
During normal operation of the sniper, when the proximity sensor detects ON, zero adjustment is performed by rotating the crankshaft forward (a + b) degrees from that position and stopping.
When the power of the snipshire is restored, the crankshaft is rotated forward, and when the proximity sensor detects OFF, the crankshaft is reversely rotated by (c- (ab)) degrees from that position and stopped. A zero adjustment method for a crankshaft of a sniper characterized by the following.

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