KR200296387Y1 - A control device for mandrel expanding of tension reel - Google Patents

Abstract

The present invention relates to a device for monitoring a mandrel operation state of a tension reel for winding a cold rolled strip, and more particularly, an expansion of a mandrel for initiating winding of a strip. (Expand) relates to a tension reel mandrel expansion state monitoring device that can accurately detect and monitor the operation and holding conditions. To this end, the present invention has a mandrel expansion control device of a tension reel having an operating rod for expanding and contracting a mandrel of a tension reel by linear reciprocating motion by hydraulic pressure of a hydraulic cylinder to perform coil winding operation when the mandrel is expanded. And a pressure sensing switch for detecting whether the mandrel is inflated according to a pressure change in the hydraulic cylinder, an indicator rod coupled with one end of the operating rod to linearly reciprocate, and a linear reciprocation of the indicator rod. A position detector for detecting whether the mandrel is expanded or contracted by detecting a change in position, and a drive controller for controlling coil winding to the mandrel based on a detection result of the position detector and the pressure sensing switch. It is characterized by.

Description

Mandrel expansion control device for tension reels {A CONTROL DEVICE FOR MANDREL EXPANDING OF TENSION REEL}

The present invention relates to a tension reel mandrel expansion control device for winding the cold rolled strip, and more particularly, to expand the mandrel for initiating winding of the strip ( The present invention relates to a tension reel mandrel expansion control device capable of accurately detecting and monitoring an operation and holding state.

1 is a view showing a schematic configuration of a conventional mandrel expansion control device of a tension reel, Figure 2 is a view showing a detailed configuration of a conventional mandrel expansion control device of a tension reel.

In general, the mandrel expansion control device of the tension reel expands the mandrel 7 under preconditions for winding the strip coil to the tension reel 6 in the mandrel shrinkage / expansion controller 13. When this is selected, the hydraulic pressure is transmitted to the rotary joint 8 through the solenoid valve 11. The hydraulic pressure transmitted to the rotary joint 8 is transmitted to the mandrel cylinder 35 through the hydraulic transmission path in the rotary joint 8. At this time, the hydraulic pressure transmitted to the cylinder 35 advances the piston 31 and the operating rod 34 in the direction in which the mandrel 7 is expanded, and when the operating rod 34 is advanced to the maximum stroke, the pressure in the hydraulic circuit Will rise. Therefore, when the pressure rises, the internal contact of the pressure switch 9 provided in the hydraulic circuit is turned on.

The on signal of the pressure switch 9 is provided as one input signal of the second end gate 22 in the relay driving control unit 20, and when the acceleration signal 10a is input through the operation operator 10, the first signal is input. The output of the AND gate 21 is '1', and the output of the second AND gate 22 is also '1'. Accordingly, the driving relay 23 is turned on to drive the tension reel motor 14 and the rolling motor 4 to perform rolling and winding of the tension reel 6.

In the above-described conventional mandrel expansion control device, the expansion state of the mandrel 7 is determined by detecting the pressure inside the cylinder 35 through the pressure switch 9. In practice, however, the pressure in the hydraulic circuit increases even when the piston 34 is not operated to the maximum stroke due to an abnormality in the hydraulic circuit and a sliding surface failure between the segment 32 and the wedge 33 of the mandrel 7. The contact of the pressure switch 9 can thus be turned on. Therefore, the rolling operation and the winding operation are performed in a state in which the mandrel 7 is not fully inflated, and thus, when the coiled coil is taken out after the winding of the rolling coil is completed, the rolled coil is rolled even when the mandrel 7 is contracted. The coil was not able to be pulled out, which caused a problem of lowering productivity and lowering quality.

Therefore, the present invention has been made to solve the above problems, and its purpose is to detect the change of the position of the operating rod and the indicator rod in the hydraulic cylinder which directly controls the expansion and contraction of the mandrel to detect the expansion state of the mandrel. It is an object of the present invention to provide a tension reel mandrel expansion control device capable of detecting and performing accurate detection of expansion and contraction of the mandrel.

1 is a conventional mandrel expansion state detection signal processing diagram.

Figure 2 is a detailed view showing the mechanical configuration of a conventional mandrel expansion control device.

3 is a block diagram showing a schematic configuration of a mandrel expansion control device according to the present invention.

Figure 4 is a detailed configuration of the mandrel expansion control device according to the present invention.

Explanation of symbols on the main parts of the drawings

1 ... speed setting device 3 ... motor control unit

4 ... rolled motor 6 ... tension reel

7.Mandrel 8 ... Rotary Joint

9.Pressure sensing switch 10 ... Operating actuator

14 ... tension reel motor 20 ... relay drive control unit

23 ... drive relay 26 ... differential amplifier

30.Indicating rod 32 ... Segment

33.Wedge 34 ... Operating Rod

36 ... position detector 40 ... drive control

15 ... Andgate Logic

In order to achieve the above object, the device according to the present invention is provided with an operating rod for expanding and contracting the mandrel of the tension reel by linear reciprocating motion by the hydraulic pressure of the hydraulic cylinder to perform a coil winding operation during the expansion of the mandrel In the reel mandrel expansion control device,

A pressure sensing switch for detecting whether the mandrel is inflated according to a pressure change in the hydraulic cylinder;

An indicator rod coupled to one end of the operating rod to linearly reciprocate;

A position detector which detects whether the mandrel is expanded or contracted by detecting a position change according to a linear reciprocation of the indicator rod;

And a drive control unit for controlling a coil winding operation to the mandrel based on a detection result of the position detector and the pressure sensing switch.

Furthermore, the drive control unit of the mandrel expansion control device of the tension reel according to the present invention

A differential amplifier which receives the detection result of the position detector and compares it with a preset reference value to determine whether the mandrel is inflated;

An AND gate logic unit for performing an AND operation on the output signal of the switch indicating deceleration / acceleration of the tension reel, the output signal of the differential amplifier, and the output signal of the pressure sensing switch;

And a relay configured to control an operation of an electric motor that is turned on / off according to an output signal of the AND gate logic unit to drive the tension reel.

Hereinafter, with reference to the accompanying drawings, the configuration and effect of the mandrel expansion control device of the tension reel according to a preferred embodiment of the present invention will be described in detail.

3 is a schematic configuration diagram of a mandrel expansion control device of a tension reel according to the present invention, Figure 4 is a detailed configuration diagram of the mandrel expansion state detection according to the present invention. As shown in FIGS. 3 and 4, a speed setter for variably setting the rotational speeds of the rolling motor 4 driving the rolling roll 5 and the tension reel motor 14 driving the tension reel 6 ( 1), the motor control unit 3 for controlling the driving of each rolling motor 4 and the tension reel motor 14 at the driving speed set in each of the speed setters 1, the speed setter 1 and When the drive relay 23 to be described later is turned on between the motor control unit 3 is turned on, the relay switch 23a for applying a driving signal to the motor control unit 3 and the hydraulic cylinder 35 inside the contact point. A pressure sensing switch 9 for detecting a pressure state of the pressure sensor, a solenoid valve 11 for transmitting and blocking hydraulic pressure into the hydraulic cylinder 35, and a solenoid valve for controlling expansion and contraction of the mandrel 7. A mandrel inflation / deflation controller 13 for controlling drive of the eleven; And a drive controller 40 for turning on / off the drive relay 23 according to the detection result of the ground switch 9 and the position detector 36 described later.

In the above configuration, reference numeral 8, which is not described, denotes a rotary joint, and 10 denotes a driving operation unit including a deceleration switch 10b and an acceleration switch 10a for selecting whether to rotate or decelerate the rotational speed of the motor.

In addition, the driving control unit 40 receives the selection signals of the deceleration switch 10b and the acceleration switch 10a and logically combines a first end gate 21, an output signal of the first end gate 21, and A second AND gate 22 which logically multiplies the detection signal of the pressure sensing switch 9, a matching amplifier 29 which receives a detection result of the position detector 25 and minimizes an error due to a potential difference between controllers; The expansion of the mandrel 7 is determined based on the first amplifier 28 and the second amplifier 27 amplifying the signal output from the matching amplifier 29 and the sensing signal output from the second amplifier 27. A differential amplifier 26 for comparing the predetermined constant reference voltage and outputting a deviation thereof, and an OR-NOT gate 25 for receiving a signal of the differential amplifier 26 and performing a negative OR operation; , The output signal of the second end gate 22 and the organ And a third AND gate 24 which multiplies the output signal of the circuit board 25 and outputs the driving signal of the driving relay 23.

The AND gate logic unit 15 includes the first AND gate 21, the second AND gate 22, and the third AND gate 24.

On the other hand, the position detector 36 is one end is connected to the operating rod 34 to expand and contract the mandrel (7) when the piston 31 is left and right linearly moved by the hydraulic pressure transmitted to the cylinder 35, The other end detects a signal change according to the moving distance of the indicator rod 30 protruding out of the rotary joint 8. That is, the expansion and contraction of the mandrel 7 is determined by detecting a change in voltage (or current) according to a change in the separation distance from the indicator rod 30.

Hereinafter, with reference to the accompanying drawings, the operation and the effect according to a preferred embodiment of the present invention will be described in detail.

First, when the solenoid valve 11 is selected to transmit the hydraulic pressure in the direction of inflating the mandrel 7 by the mandrel expansion / contraction controller 13, the hydraulic pressure is transmitted to the rotary joint 8 through the solenoid valve 11. do. At this time, the hydraulic pressure transmitted to the rotary joint 8 is transmitted to the cylinder 35 of the mandrel 7 through the hydraulic transmission path in the rotary joint 8. That is, the piston 31 of the cylinder 35 moves (advances) the piston 31 and the operating rod 34 to the left by the hydraulic pressure transmitted from the solenoid valve 11. The wedge 33, which cooperates with the advancing of the operating rod 34, causes the segment 32 of the mandrel 7 to rise and expand along the inclined surface of the wedge 33. In addition, when the piston 31 advances to the maximum stroke, the mandrel 7 is expanded, and at this time, the pressure in the cylinder 35 is increased to turn on the contact of the pressure sensing switch 9.

The on signal of the pressure sensing switch 9 is applied as an input signal of the second end gate 22 of the driving controller 40. At this time, when the acceleration switch 10a is turned on through the operation operator 10, the output of the first end gate 21 becomes '1', and the output of the second end gate 22 also becomes '1'.

On the other hand, when the operating rod 34 is advanced by the advance of the piston 31, the indicator rod 30 having one end coupled to the operating rod 34 is closer to the position detector 36, the position detector 36 The detection current value of V is changed according to the separation distance. For example, in the present invention, it is assumed that the detection current decreases in proportion to the separation distance.

Accordingly, the position detector 36 applies the sensed detected current value to the matching amplifier 29 of the driving controller 40, and the matching amplifier 29 converts the input signal into an analog voltage signal 1-10V. To be applied to the first amplifier 28. The detection voltage signal applied to the first amplifier 28 is amplified through the first amplifier 28 and the second amplifier 27 and then input to the non-inverting terminal (+) of the differential amplifier 26.

At this time, an inflation voltage set by the variable resistor (the voltage detected by the position detector 36 when the mandrel 7 is fully expanded) is applied to the inverting terminal (-) of the differential amplifier 26 so that The difference between the expansion voltage and the detected voltage value input to the non-inverting terminal is output to the output terminal. That is, the differential amplifier 26 outputs a low level (eg '0') signal as an output signal when the preset expansion voltage and the detection voltage detected by the position detector 36 are the same. In addition, the onat gate 25 receives the output signal of the differential amplifier 26 and the output is '1', and the output signal of the onat gate 25 is input to the third end gate 24.

Accordingly, the third AND gate 24 performs a logical AND operation on the output signal of the second AND gate 22 and the output signal of the onat gate 25 to output '1', thereby turning on the relay 23. The contact point of the switch 23a is turned on.

The motor controller 3 drives the rolling motor 4 and the tension reel motor 14 according to the driving speed of the motor set in the speed setting unit 1 to wind the strip coil on the mandrel 7. do. Then, when the coiling operation is completed, the solenoid valve 11 is selected in the direction in which the piston 31 and the operating rod 34 move backward (move to the right side) and the mandrel 7 is contracted to easily pull out the coil. To be possible. That is, as the operating rod 34 retracts, the segment 32 of the mandrel 7 descends along the inclined surface of the wedge 33 and contracts the mandrel 7 so that the radius of the mandrel 7 is larger than the radius of the wound coil. It becomes small and it becomes easy to pull out a coil.

Mandrel expansion control device of the tension reel according to the present invention is not limited to the above-described embodiment can be carried out in various modifications within the range allowed by the technical idea of the present invention.

As described above, the mandrel expansion control device of the tension reel according to the present invention can accurately detect and quantify the mandrel expansion state of the tension reel so that the mandrel is not fully inflated due to the hydraulic system and the sliding surface of the mandrel. The winding of the strip coil cannot be carried out without the use of the coil. Therefore, by fully coiling the mandrel after the mandrel is fully inflated, a smooth operation of the production line according to the inability to pull out the coil is enabled, thereby improving the productivity and preventing the deterioration of the strap coil.

Claims (2)

A tension reel mandrel expansion control device having an operating rod for linearly reciprocating by hydraulic pressure of a hydraulic cylinder to expand and contract a mandrel of a tension reel to perform coil winding operations when the mandrel is inflated. A pressure sensing switch for detecting whether the mandrel is inflated according to a pressure change in the hydraulic cylinder; An indicator rod coupled to one end of the operating rod to linearly reciprocate; A position detector which detects whether the mandrel is expanded or contracted by detecting a position change according to a linear reciprocation of the indicator rod; And a drive control unit for controlling a coil winding operation to the mandrel based on a detection result of the position detector and the pressure sensing switch. The method of claim 1, wherein the drive control unit A differential amplifier which receives the detection result of the position detector and compares it with a preset reference value to determine whether the mandrel is inflated; An AND gate logic unit for performing an AND operation on the output signal of the switch indicating deceleration / acceleration of the tension reel, the output signal of the differential amplifier, and the output signal of the pressure sensing switch; And a relay for controlling an operation of an electric motor that is turned on / off according to an output signal of the AND gate logic unit to drive the tension reel.