JP4212836B2 - Pressing force control system in leaf tobacco press packing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a squeezing force control system in a leaf tobacco squeezing and packing machine that squeezes and packs leaf tobacco into a fixed package .
[0002]
[Prior art]
The compression packing machine presses and compresses a compressed plate such as leaf tobacco, paper, and industrial waste by using a pressing force by descending the compressed plate into a fixed package.
Currently, the press packing machine uses an inverter to operate at a low speed to generate a large pressing force when the pressing plate descends, and to operate at a high speed to reduce work time when the pressing plate rises There is.
In the previous squeeze packing machine, the up and down movement of the squeeze plate has to be prioritized to ensure the squeezing force. The pressing work time was shortened and the pressing work efficiency was improved.
[0003]
By the way, for example, when putting leaf tobacco into a certain packing form with a pressure packing machine, with the leaf tobacco stacked in a full box, by lowering the pressurization part, the stacked leaf tobacco is crushed and crushed leaf tobacco The work of stacking and pressing the leaf tobacco in a box is repeated until it reaches a certain packing state, and this work is performed several tens of times a day.
The inventor of the present application focused on the lowering of the pressurization unit in the above-described current press packing machine in order to further improve the work efficiency of the press. Thus, it was found that there was no need to lower it, and the present invention was reached.
[0004]
[Problems to be solved by the invention]
Then, this invention makes it a subject to aim at the further improvement of pressing work efficiency by shortening the descent time to the position which requires pressing force which crushes leaf tobacco substantially, and pressing force in a compression packing machine which can solve this subject The purpose is to provide a control system.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs the following technical means.
A squeezing force control system in a tobacco compression packing machine for packing the leaf tobacco pressing are stacked descends squeezed to a constant of packing, controlling the operation of the driving unit for vertically moving the pressing a control means, said control means includes a speed switching control means switches to the low speed at a point halfway down the lowering speed of at least the pressing, the speed switching control means uses the inverter control circuit, the The inverter current value is sensed when the load acting on the pressurizing unit becomes large, and when the current value that is the squeezing force that substantially crushes the preset leaf tobacco is sensed, the frequency of the inverter is switched. The driving unit is controlled so that the pressurizing unit descends at a low speed .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The arbitrary position in the middle of descent here includes any position from the descent start point to the descent limit point, but is preferably a position where deficiency is caused by the squeezing force due to high-speed descent.
Specifically, it is a position at the time when the resistance of the object to be squeezed that occurs when the pressurizing unit descends and squeezes the object to be squeezed is equal to or exceeds the squeezing force by high-speed descent.
[0007]
Since the lowering limit point of the pressurizing unit varies depending on the type and hardness of the object to be compressed or the size of the package, it is necessary to set a lowering limit point suitable for the object to be compressed.
Therefore, it is preferable that the speed switching control means includes a control for stopping the lowering of the pressurizing unit at an arbitrary lowering limit point of the pressurizing unit. (Claim 2)
[0010]
In addition to the speed switching control means described above, the control means of the present invention is an operation switching control means (for example, for switching the operation of the vertical movement of the pressurizing unit between a lowering start point (upward limit point) and a lowering limit point (upward start point)). It is preferable to have a limit switch and a manual switch.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the squeezing force control system of the present embodiment is provided with a control means using an inverter control circuit in the speed switching control means 1, and by increasing the load on the pressurizing unit 2 during squeezing. The inverter control circuit senses and outputs a change in the current value, thereby switching the frequency of the inverter 3 to perform control to switch and stop the drive unit 4 at a low speed.
The ascending speed of the pressurizing unit 2 and the descending speed before sensing the current value are set to a high speed in advance.
The vertical movement switching of the pressurizing unit 2 is controlled by operating the operation switch 5, and the pressurizing unit 2 is controlled by the ascent limit switch (ULS) 6 in order to stop the pressurizing unit 2 at the ascent limit position.
Further, the descent stop control of the pressurizing unit 2 is basically performed by sensing the current value described above, but when the resistance force against the squeezing force of the object to be squeezed is small, the current value is set to a numerical value that stops the descent. Since it is also possible that a situation that does not occur will occur, control is also performed by a lowering limit switch (DLS) 7 that stops the pressurizing unit 2 at the lowering limit position.
The code | symbol 8 is a power switch of a pressing packing machine, and will be in the state in which an operation and control of a pressing packing machine are possible by operation of the said switch.
[0012]
The operation of the squeezing force control system including the control means described above will be described based on the flowchart shown in FIG.
[0013]
(Start) By turning on the power switch 8, the squeeze packing machine can be operated and controlled.
(SP1) When the operation switch 5 is lowered and turned on, the lowering switch X1 of each part is interlocked to be turned on, and the pressurizing part 2 is lowered.
(SP2) In the state where the pressurizing unit 2 descends and squeezes the object to be squeezed, the inverter control circuit 1 detects a change in the current value due to the load acting on the pressurizing unit, and the control circuit sets in advance. When the current value is detected, the control switch X3 is turned on and held, so that the inverter switches the frequency to drive the drive unit 4 at a low speed, and the pressurization unit descends accordingly. .
(SP3) In a state where the pressurizing unit 2 descends at a low speed and squeezes the object to be squeezed, the inverter control circuit 1 detects a change in current value due to a load acting on the pressurizing unit, and the control circuit sets in advance. When a current value larger than the current value is detected, the control switch X3 is turned off and the lowering switch X1 is turned off to stop the driving of the driving unit 4. Accordingly, the lowering of the pressing unit 2 is stopped. To do.
(SP4) When the pressurization unit reaches the lowering limit point in a state where the current value in SP3 is not detected, the lowering is stopped by the lowering limit switch 7.
(SP5) When the operation switch 5 is raised and turned on, the raising switch X2 of each part is turned on in conjunction with the pressurizing part 2 to rise.
(SP6) When the pressurizing unit reaches the rise limit point, the rise is stopped by the rise limit switch 6.
(SP7) The above-described SP1 to SP6 are repeated as many times as necessary, and the power switch 8 is turned off to complete the pressing work.
[0014]
In addition to the speed switching control means in the embodiment described above, the control system of the present invention performs switching by sensing a change in resistance acting on the drive unit due to an increase in load on the pressurizing unit during squeezing as described above. Controls, switching control by sensing changes in the current value of the drive unit due to an increase in load on the pressurizing unit during squeezing, sensing changes in pressure due to an increase in load on the pressurizing unit during squeezing It is possible to implement the switching control by performing the switching control and the switching control by measuring the time from the start of the lowering of the pressurizing unit and sensing the set time.
In terms of circuit, this can be achieved by replacing the inverter control circuit with a control circuit that detects resistance, current value, pressure, and time.
[0015]
Hereinafter, a control system using the control means based on time detection will be described as a second embodiment with reference to FIG. 3 and FIG.
As shown in FIG. 3, the squeezing force control system of this embodiment is provided with a control means using a timer in the speed switching control means 1, and the timer measures the time from the start of descending and is set in advance. By detecting and outputting the time, the frequency of the inverter 3 is switched, and the drive unit 4 is controlled to be switched at low speed and stopped.
Except for the speed switching control means by the timer T1, it is the same as the above-described embodiment, so that the description thereof is omitted.
[0016]
The operation of the squeezing force control system including the control means described above will be described based on the flowchart shown in FIG.
[0017]
(Start) By turning on the power switch 8, the squeeze packing machine can be operated and controlled.
(SP1) When the operation switch 5 is lowered to ON, the lowering switch X1 of each part is turned on in conjunction with the pressing part 2 to be lowered.
Simultaneously with this descent, time measurement is started.
(SP2) When the set time is detected, the control switch X3 is turned ON, and by holding this, the inverter switches the frequency to drive the drive unit 4 at a low speed, and accordingly the pressurizing unit Descent is slow.
(SP3) The time is measured even in a state where the pressurizing unit 2 descends at a low speed and squeezes the object to be squeezed. When it is detected that this time is a preset time, the control switch X3 is turned off. At the same time, the lowering switch X1 is turned off to stop the driving of the driving unit 4, and accordingly, the lowering of the pressing unit 2 is stopped.
(SP4) When the operation switch 5 is raised and turned on, the raising switch X2 of each part is turned on and the pressurizing part 2 is raised.
(SP5) When the pressurizing unit reaches the rise limit point, the rise is stopped by the rise limit switch 6.
(SP6) The above-described SP1 to SP5 are repeatedly performed as many times as necessary, and the power switch 8 is turned off to complete the pressing work.
[0018]
In this embodiment, since the descent of the pressure portion is stopped by detecting the set time, the control means does not need to be controlled by the lower limit switch in the above-described embodiment, but in the circuit, a timer It is arranged for the operation of the expression packing machine when not using.
The time to set is the time to reach a position that requires a large squeezing force during high-speed descent.
[0019]
【The invention's effect】
As described above, the present invention has the following excellent effects.
According to the present invention, in the control system, the speed of the pressurizing unit is switched to a low speed by detection of various detection targets in the middle of the descent, and the descent time to a position requiring a pressing force that substantially crushes the leaf tobacco is shortened. Therefore, the further improvement of pressing work efficiency can be achieved.
In addition, since it is a control system in which the low-speed descent continues until detection of various detection targets is performed and the pressurization unit is stopped at the time of detection, the certainty of squeezing to the object to be compressed is improved, In packing, it has an extremely high effect both efficiently and reliably.
[Brief description of the drawings]
FIG. 1 is a circuit diagram of a press packing machine that employs a control system according to the present invention.
FIG. 2 is a flowchart of a control system according to the present invention.
FIG. 3 is a circuit diagram of another example of the expression packing machine that employs the control system according to the present invention.
FIG. 4 is a flowchart of another example of the control system according to the present invention.
[Explanation of symbols]
1: Speed switching control means 2: Pressurizing unit 3: Inverter 4: Drive unit 5: Operation switch 6: Up limit switch 7: Down limit switch 8: Power switch

Claims (2)

A pressing force control system in a leaf tobacco squeezing and packing machine that squeezes and packs the leaf tobacco stacked with the pressurization unit lowered and packed,
A controlling unit for controlling the operation of the driving unit for vertically moving the pressing,
The control means includes a speed switching control means switches to the low speed at a point halfway down the lowering speed of at least the pressing,
The speed switching control means senses an inverter current value when a load acting on the pressurizing unit becomes large using an inverter control circuit, and becomes a squeezing force that substantially crushes a preset leaf tobacco. A pressing force control system in a leaf tobacco pressing and packaging machine, wherein when the current value is sensed, the drive unit is controlled so that the frequency of the inverter is switched and the pressing unit is lowered at a low speed. The speed switching control means, squeezing force control system in a tobacco compression packing machine according to claim 1, characterized in that it comprises the stopping the downward of the pressure at any lowering limit point of the pressing .

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