JP2017159910A - Packaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new packaging device that can contribute to power-saving by reducing consumed power by a vacuum pump and the number of times of maintenance.SOLUTION: A packaging device comprises: a conveying belt that conveys a film while suctioning the film via a plurality of suction ports; a negative pressure chamber, arranged at the backside of the conveying belt, which applies negative pressure to the suction ports; a vacuum pump that decompresses the negative pressure chamber; a detecting portion that detects conveyance speed of the film; and a control portion that determines a deviation between the detected conveyance speed and set speed of the conveyance belt, stops the vacuum pump when the determined deviation is within an allowable range and drives the vacuum pump when the determined deviation is out of the allowable range. This can decrease operation time of the vacuum pump and suppress consumed power by the pump.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power saving countermeasure technique for a packaging apparatus including a pull-down belt that conveys a belt-shaped film while sucking it.

  A so-called suction-type pull-down belt is used in a bag making and packaging apparatus for forming a belt-like film into a bag while forming it into a tube shape. This pull-down belt is transported while sucking the side surface of the tubular film with a perforated belt that goes around the negative pressure chamber.

  The negative pressure chamber that applies negative pressure to the perforated belt is connected to a vacuum pump. However, since the vacuum pump is always driven while the apparatus is in operation, it is difficult to suppress power consumption. . Therefore, Patent Document 1 below detects the degree of vacuum in the negative pressure chamber, detects the degree of vacuum within the predetermined range, detects the rotation speed of the vacuum pump, and detects the film conveyance speed, And a technique for controlling the degree of vacuum so that the detection speed falls within a predetermined range.

JP 2011-46533 A

  However, the technique disclosed in Patent Document 1 has a problem that the number of revolutions of the vacuum pump is controlled using an inverter, and therefore, it is more expensive than a normal vacuum pump without an inverter. Also, even if the number of rotations of the vacuum pump is controlled based on the detected film conveyance speed, the vacuum pump is driven without stopping, so the movable part must be regularly maintained, There is a problem that the running cost is amplified accordingly.

  The present invention has been developed in view of such problems, and it is an object of the present invention to provide a new packaging device that can contribute to power saving by reducing the power consumption and maintenance frequency of a vacuum pump.

  The packaging device according to the present invention includes a transport belt that transports a film while sucking a film with a plurality of suction ports, a negative pressure chamber that is disposed on the back side of the transport belt and applies a negative pressure to the suction ports, A vacuum pump for reducing the pressure in the negative pressure chamber, a detection unit for detecting the conveyance speed of the film, a deviation between the detected conveyance speed and the set speed of the conveyance belt is obtained, and the obtained deviation is within an allowable range. And a controller for driving the vacuum pump when the deviation deviates from an allowable range.

FIG. 1 is a diagram illustrating the configuration of the present invention. In this figure, the outline of the vertical bag making and packaging apparatus is shown, but the packaging apparatus is not limited to this.
In this figure, a packaging device 100 includes a hopper 1 into which articles are placed from above, a cylinder 2 connected to a lower end opening of the hopper 1, and a periphery of the cylinder 2 so that a belt-like film F is formed in a tube shape. The former 3 is formed on the both sides of the cylinder 2 and is conveyed on the back side of the conveyor belt 4 while conveying the film TF formed in a tube shape while sucking it. A negative pressure chamber 5 that applies negative pressure to a plurality of suction ports 41 provided in the belt 4, a vertical seal portion 6 that vertically seals with both edges of the tubular film TF overlapped, and a tubular film TF. These are provided with a horizontal seal portion 7 that horizontally seals the two upper and lower portions at the same time and cuts between them.

  2 and 3 are external perspective views of an embodiment of the conveyor belt 4 and the negative pressure chamber 5. In particular, FIG. 3 shows a state in which one of the conveyor belts 4 is removed. In these drawings, the conveyor belt 4 is constituted by an endless belt in which suction ports 41 penetrating the belt are provided at equal intervals along the longitudinal direction of the belt. In these drawings, the suction ports 41 are omitted from the upper and lower pulleys 42 and 43 that circulate the conveyor belt 4, particularly in the U-turn portion of the conveyor belt 4. 41 are provided at equal intervals.

  The negative pressure chamber 5 is formed in a box shape having an opening 51 (see FIG. 3) on the side facing the tubular film TF, and the opening 51 is arranged along the back surface of the conveyor belt 4. ing. Therefore, when the suction port 41 of the transport belt 4 overlaps with the opening 51, a negative pressure is applied to the suction port 41 so that the tubular film TF is attracted to the transport belt 4. Thereby, the tubular film TF is transported downward while being adsorbed by the transport belt 4.

  As shown in FIG. 3, a pipe socket 52 is attached to the back side of each negative pressure chamber 5, and the pipe socket 52 is connected to the intake pipe 53 of FIG. . Thereby, the negative pressure chamber 5 is depressurized by the vacuum pump 54. In FIG. 1, for convenience of explanation, the piping socket 52 of FIG. 3 is shown arranged on the front side of the apparatus, but is usually provided on the back side.

  There are various types of commercially available vacuum pumps 54. In particular, in the type in which the exhaust side of the pump is opened to the atmosphere when the vacuum pump is stopped, as shown in FIG. 1, the intake pipe 53 or the vacuum pump 54 is used. An electromagnetic valve 55 is attached to the exhaust pipe of the cylinder, and the vacuum pump 54 is stopped after the electromagnetic valve 55 is closed. Then, even if the vacuum pump 54 is stopped, the negative pressure chamber 5 is not opened to the atmosphere, so that the negative pressure can be maintained for a long time.

  Since the negative pressure chamber 5 is disposed in the circulation path of the conveyor belt 4, its internal capacity is considerably limited. Therefore, it is preferable to connect the vacuum auxiliary chamber 56 to the intake pipe 53 to increase the internal volume of the negative pressure chamber. Thus, when the vacuum pump 54 is stopped, the negative pressure state of the negative pressure chamber 5 can be maintained for a longer time.

  Returning to FIG. 1, the detection unit 8 that detects the film conveyance speed is composed of a rotary encoder that is in contact with the tubular film TF and rotates as the film travels. Instead, the film is printed on the film. You may make it detect an eye mark and detect the conveyance speed of a film from the detection period.

  The set speed of the transport belt 4 is calculated based on the operation speed (number of bags / min) set in the packaging device 100 and the transport length for one bag. Moreover, in FIG. 1, although a pair of conveyance belt 4 is arrange | positioned on both sides of the tubular film TF, instead of this, for example, the conveyance belt 4 is arrange | positioned on the opposite side of the vertical seal | sticker part 6, and between these. You may make it convey the tubular film TF with the vertical seal | sticker part 6 and the conveyance belt 4 on both sides of the tubular film TF.

  The control unit 9 is configured by a computer, and by executing a built-in program, the deviation between the conveyance speed detected by the detection unit 8 and the set speed set on the conveyance belt 4 is obtained, and the obtained deviation is obtained. Is within the permissible range, the vacuum pump 54 is stopped, and if it deviates from the permissible range, the vacuum pump 54 is driven. For this reason, the detection speed from the detection section 8 and the set speed of the conveyor belt 4 are input to the control section 9, and control signals are output from the control section 9 to the vacuum pump 54 and the electromagnetic valve 55. It has become.

  In FIGS. 2 and 3, the transport belt 4 is driven by a pulley 43 directly connected to a motor 44, so that it travels at a set speed. If the suction force is weakened, it becomes impossible to follow the conveyor belt 4 and a delay occurs. Therefore, if the speed deviation between the two is within the allowable range, the controller 9 stops the vacuum pump 54, and if the speed deviation is outside the allowable range, the controller 9 drives the vacuum pump 54 to draw the suction force of the negative pressure chamber 5. Control to recover. In this case, the allowable range can be obtained from an error range recognized for the feed length for one bag, for example. It depends on the bag size. For example, if the feed length for one bag is shifted by 1 mm, it will be treated as a defective product, and the speed deviation corresponding to the amount of shift will be the limit, and the speed deviation within that limit will be within the allowable range. Set as in. Further, when the vacuum pump 54 is stopped, the suction force of the negative pressure chamber 5 gradually weakens. Therefore, the speed deviation is detected by the detector (rotary encoder) 8 disposed in the immediate vicinity of the conveyor belt 4, and based on that, the vacuum pump 54 is ON / OFF controlled. Thereby, the operation time of the vacuum pump 54 can be reduced while minimizing the film transport error.

  The strip film F is formed into a tube shape by a former 3 surrounding the cylinder 2, and the transport belt 4 transports the tube film TF while pressing the tube film TF against the cylinder 2. Therefore, when the frictional resistance between the cylinder 2 and the tube-shaped film TF is large, the suction force of the conveying belt 4 is slightly reduced and slip occurs between the two, whereby the on / off control of the vacuum pump 54 is repeated. It will be.

  Therefore, in the packaging device 100 provided with the former 3 for forming the belt-like film into a tube shape and guiding it to the outer periphery of the cylinder 2, the cylinder 2 A duct 10 for supplying a gas is provided between the film and the film.

  4 and 5 show the schematic configuration. In FIG. 4, a duct 10 is arranged on the outer peripheral surface of the cylinder 2 with which the conveyor belt 4 contacts, and a plurality of exhaust ports 11 are provided on the outer surface of the duct 10. The gas 12 is ejected from the exhaust ports 11 at a predetermined pressure. In FIG. 5, a plurality of holes 11 are formed at locations where the conveyance belt 4 of the cylinder 2 contacts, and the holes 11 communicate with the duct 10 disposed on the inner peripheral surface of the cylinder 2. The gas 12 having a predetermined pressure is ejected from the air.

  The gas 12 used here is air or an inert gas such as nitrogen or argon. In the case of processed foods using oil, the bag is filled with an inert gas, and a part of the gas is pressurized and supplied to the duct 10 to float the tubular film TF from the outer peripheral surface of the cylinder 2. Thereby, the frictional resistance generated between the tubular film TF and the cylinder 2 can be reduced, and the number of on / off operations of the vacuum pump 54 can be reduced.

  According to the present invention, since the vacuum pump is stopped while there is no delay in the film conveyance speed, the operation time of the vacuum pump can be reduced to reduce the power consumption, and the maintenance frequency can be reduced. Can be reduced. Therefore, the life of the vacuum pump can be extended and the running cost of the packaging device can be reduced.

  In addition, since gas is supplied between the running film and the cylinder to reduce the frictional resistance generated between them, even if the suction force of the conveyor belt weakens, film conveyance continues without causing slip. Can be made. Therefore, the number of times the vacuum pump is turned on / off can be further reduced.

  In addition, since the vacuum auxiliary chamber is provided in the suction pipe of the vacuum pump to maintain the suction force of the negative pressure chamber, the operation time of the vacuum pump can be further reduced.

Structure explanatory drawing of the packaging apparatus which concerns on this invention. The external appearance perspective view of one Embodiment of a conveyance belt and a negative pressure chamber. FIG. 3 is an external perspective view in a state where one of the conveyance belts of FIG. 2 is removed. Structure explanatory drawing which arrange | positions a duct in the outer peripheral surface of a cylinder. Configuration explanatory drawing which arrange | positions a duct in the internal peripheral surface of a cylinder. The external appearance perspective view of the principal part of the packaging apparatus which concerns on one Embodiment of this invention. The partial cross-section perspective view which shows the structure of a conveyance belt. The block diagram of the control system of the packaging apparatus which concerns on embodiment.

  Hereinafter, a packaging device according to an embodiment of the present invention will be described with reference to the drawings. In addition, embodiment shown below does not limit the technical scope of this invention. Moreover, the same code | symbol is used for the thing of the same structure as each part shown in FIG.

FIG. 6 is an external perspective view of the main part of the packaging device according to the embodiment of the present invention. In this figure, a packaging device 100 includes a cylinder 2 connected to a lower opening of a hopper 1, a former 3 that is disposed on the outer periphery of the cylinder 2, and forms a strip film F into a tube shape, and is wound around the cylinder 2. A pair of left and right transport belts 4 for sucking the tube-shaped film TF conveyed downward, a vertical seal portion 6 for welding both side edges of the tube-shaped film TF wound around the cylinder 2, and a lower portion thereof It is provided with a pair of front and rear lateral seal portions 70 arranged.
The packaging device 100 is provided with an operation box 30 for setting various operation conditions such as an operation speed and a bag size.

  The film roll FR is mounted on the delivery unit 20 shown in FIG. 8, and the rotation of the film roll FR is controlled so that the delivery speed of the film F becomes a constant speed. The belt-like film F fed out in this way is guided to the former 3 via a plurality of guide rollers GR, where it is formed into a tube shape and wound around the cylinder 2. The wound tubular film TF is overlapped on both sides at the front side of the cylinder 2 and the vertical seal portion 6 is pressurized and heated from above, whereby the seam is vertically sealed S to form a tubular bag. Is done.

  The vertical seal portion 6 is continuously heat-welded while pressing both side edges of the tubular film TF wound around the cylinder 2 against the cylinder 2 by the metal belt 62 rotating around the heater 61 in the vertical direction. It is like that. However, in the case of gluing, the mechanism is replaced with a mechanism that seals the both edges of the film that has been palmed from both sides.

  The horizontal seal portion 70 is of a rotary type that rotates in opposite directions, and applies a horizontal horizontal seal to the tubular film TF while rotating a pair of seal jaws 71, 71 arranged at the front and rear, After sealing the upper part of the bag and the lower part of the following bag at the same time, the boundary is cut and separated. In this embodiment, the sealing jaws 71 and 71 are configured to draw a circular motion or a D-shaped movement locus. Instead, for example, the sealing jaws 71 and 71 sequentially circulate in the horizontal direction and the vertical direction. A box motion type or a reciprocating type that moves close to and away from each other in a horizontal plane can be used.

  As shown in FIGS. 2 and 3, the conveyor belt 4 is an endless belt. A specific configuration thereof is shown in FIG. In FIG. 7, the back side of the conveyor belt 4 is shown facing upward. In this figure, the conveyor belt 4 is formed in a U-shaped cross section, and the hill portions 45 on both sides thereof are formed as a bladed belt that meshes with the timing pulleys 42 and 43 in FIG. Further, suction ports 41 are formed in the flat belt portion 46 sandwiched between the hill portions 45 on both sides at equal intervals along the longitudinal direction of the belt. The suction port 41 is formed as a two-stage suction port having a small diameter on the side facing the opening 51 of the negative pressure chamber 5 and a large diameter on the side in contact with the tubular film TF. And the opening part 51 of the negative pressure chamber 5 of FIG. 3 fits between the hill part 45 of these both sides, and makes a negative pressure act on the suction opening 41. FIG.

  FIG. 8 shows a block diagram of a control system of the packaging apparatus 100 according to this embodiment. In this figure, the control part 9 is comprised with a computer, and controls the whole packaging apparatus 100 by running the program set there. For this reason, an operation box 30 is connected to the control unit 9, and operation conditions such as an operation speed (bag / minute) and a bag size can be set therefrom. Further, the detection speed of the tubular film is input to the control unit 9 from the detection unit 8, and the speed deviation is calculated by comparing the detection speed with the conveyance speed of the conveyance belt 4 obtained from the operating conditions. Based on the deviation, an on / off control signal is output to the vacuum pump 54 and the electromagnetic valve 55.

  Moreover, the control part 9 will set it to each drive motor of the conveyance belt 4, the vertical seal | sticker part 6, and the sending-out unit 20, if the conveyance speed of a film will be obtained. Thereby, the conveyance belt 4 travels at the set speed, the vertical seal unit 6 travels the metal belt 62 at the same speed, and the delivery unit 20 delivers the film F at the same speed. Accordingly, the belt-like film F is always conveyed at the same speed in the upstream and downstream. Further, the control unit 9 controls the rotation of the horizontal seal unit 70 at the set operation speed.

  When a power switch (not shown) is operated, the heater units of the vertical seal portion 6 and the horizontal seal portion 70 are first heated, and the vacuum pump 54 is also driven to depressurize the negative pressure chamber 5. At this time, the electromagnetic valve 55 is in an opened state.

  When the start button displayed on the operation box 30 is operated from this standby state, the control unit 9 operates the delivery unit 20, the conveyor belt 4, the vertical seal unit 6 and the horizontal seal unit 70 all at once to form a tube shape. Bags are continuously created from film TF.

  The control unit 9 periodically inputs the detection signal of the detection unit 8 while performing such an operation, and obtains a deviation between the detected conveyance speed and the conveyance speed set on the conveyance belt 4. If the deviation is within the allowable range, the control unit 9 stops the vacuum pump 54 and interrupts the energization of the electromagnetic valve 55. Then, the electromagnetic valve 55 is closed, and the pressure inside the negative pressure chamber 5 is maintained for a while. Thereafter, the control unit 9 periodically inputs the detection signal of the detection unit 8 while repeating the operation control for each unit. If the speed deviation is out of the allowable range, the controller 9 drives the vacuum pump 54 and energizes the electromagnetic valve 55 to open it. Thereby, the negative pressure chamber 5 returns to the original reduced pressure state. The controller 9 continuously creates bags while repeating the above operation.

  As mentioned above, although one Embodiment of this invention was described, it is not limited to this, Other structures are employable. For example, as shown in FIGS. 4 and 5, a duct 10 for injecting an inert gas may be provided at a location where the tubular film TF is pressed against the outer periphery of the cylinder 2 by the transport belt 4. Alternatively, a plurality of rollers may be provided on the outer periphery of the cylinder 2, and the transport belt 4 may transport the tubular film by pressing the tubular film TF against the roller. In this case, the number of on / off control times of the negative pressure chamber 5 can be further reduced.

DESCRIPTION OF SYMBOLS 2 Cylinder 3 Former 4 Conveyor belt 5 Negative pressure chamber 6 Vertical seal part 7 Horizontal seal part 8 Detection part 9 Control part 10 Duct 12 Gas 41 Suction port 54 Vacuum pump 55 Electromagnetic valve 56 Vacuum auxiliary chamber 100 Packaging apparatus TF Tubular film ( the film)

Claims (3)

  A conveyance belt that conveys the film while sucking the film with a plurality of suction ports, a negative pressure chamber that is disposed on the back side of the conveyance belt and applies a negative pressure to the suction port, and a vacuum that depressurizes the negative pressure chamber A pump, a detection unit for detecting the conveyance speed of the film, and obtaining a deviation between the detected conveyance speed and the set speed of the conveyance belt, and stopping the vacuum pump if the obtained deviation is within an allowable range, And a control unit that drives the vacuum pump when the deviation deviates from an allowable range.   The packaging apparatus according to claim 1, wherein a vacuum auxiliary chamber is connected to the negative pressure chamber.   A duct for supplying a gas between the cylinder and the film is provided at a location where the film is pressed by the conveying belt at least in the cylinder. The packaging apparatus according to claim 1, further comprising:

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