JP4231255B2 - Heating unit for packaging machine and heater temperature control system for packaging machine using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heater unit for a packaging machine that applies heat to a packaging material such as a heat sealer or a fusing device used in a packaging machine, and a heater temperature control system for a packaging machine using the same.
[0002]
[Prior art]
Conventionally, in a packaging machine, in order to form a packaging bag or a container from a packaging material made of a heat-welding synthetic resin film or a packaging material having a heat-welding film layer, A fusing device that cuts a packaging material into a predetermined shape is used. As the heat sealer, a point sealer that seals a narrow area of packaging material as seen in the packaging of rice balls and sandwiches, a rotary roller type heat sealer that uses a circumferential surface of a rotating body such as a cylinder or piece as a heat welding surface, or a vertical sealer. A bar shape (block shape) that reciprocates, rotates, or moves in a box to heat and close individual packaging bags or continuous tube-like packaging materials, as found in mold or horizontal pillow packaging machines There is a heat sealer. The fusing device is used by raising the temperature of the heater to such an extent that the packaging material can be melted and separated.
[0003]
In any heat sealer or fusing device, the temperature management of the heater is necessary to appropriately weld or cut the packaging material according to the type / characteristics of the packaging material and the surrounding environment. Therefore, recent heat sealers and fusing devices are unitized as a heater block having a heater having a wire-like heating element such as a nichrome wire that generates heat when energized, and a temperature sensor built in the vicinity thereof. The temperature of the heat sealer and the fusing device is accurately detected by a temperature sensor, and temperature control is performed to eliminate an error from the target temperature.
[0004]
FIG. 4 is a schematic diagram showing an example of a conventional packaging machine heater unit using a general heater and temperature sensor in a packaging machine, and a conventional packaging machine heater temperature control system using the same. As shown in FIG. 3C, the heater 31 used in the conventional packaging machine heater unit U ′ has a structure in which a heating element 32 that generates heat when energized, such as a nichrome wire, is embedded in a rod shape. Two energization cords 33 for supplying power to the heating element 32 from one end thereof are connected. Further, as shown in FIG. 3 (d), a temperature sensor 35 used in the packaging machine heater unit U ′ includes a thermocouple 36 that generates electromotive force as a temperature measuring element, and an external device connected to the thermocouple 36. And two measuring cords 37 extending in the direction.
[0005]
As shown in FIG. 4, the conventional packaging machine heater unit U ′ is configured by accommodating a heater 31 and a temperature sensor 35 inside a heater block 34. The packaging machine heater temperature control system S ′ is a system in which the packaging machine heater unit U ′ configured as described above is incorporated. Further, the energization cord 33 and the measurement cord coming out of the heater block 34 are provided. 37, the heater temperature controller 20 connected to the power supply output terminal 21 and the measurement input terminal 22 through the power supply connection cord 9 and the measurement connection cord 10 from the terminal block 8 and the power supply connection cord 9. The power supply 11 is connected to the connection cord 9 and supplies power to the heating element 32, and the relay 12 is interposed in the connection cord 9 for energization. A temperature sensor 35 comprising a thermocouple 36 measures the temperature of the heater block 34 having a heating surface 34a for heating the packaging material, and the heater temperature controller 20 controls the operation of the relay 12 based on the measurement data. Thus, the energization and de-energization of the heater 31 are repeated to control the temperature of the heater block 34 to the set temperature. For the temperature control, PID (proportional / integral / derivative) control is generally used.
[0006]
By the way, the heater block 34 is often attached to a movable part that enables the rotation of a heat sealer or the like and the movement of a box motion or the like, and due to the repeated operation of the movable part, for the heater 31 and the temperature sensor 35. There is a possibility that various wires and cables may be disconnected due to metal fatigue. Further, the nichrome wire as the heating element 32 housed in the heater 31 may be disconnected due to repeated energization. If the heater 31 or the temperature sensor 35 breaks down due to disconnection or malfunction, the temperature control of the heater block 34 becomes impossible, and the packaging machine must be stopped. When the heater 31 or the temperature sensor 35 breaks down, the heater temperature controller 20 issues a warning to that effect.
[0007]
However, the usage pattern on the user side of recent packaging machines tends to be operated day and night in order to produce a wide variety of packaged products in accordance with the shipping time. , It does not always occur during the day, but may occur during the night. Since heaters and temperature sensors are considered consumables in packaging machines, these failures are generally dealt with in the manner of repair or replacement with normal parts. Even if spare parts for the heater and the temperature sensor are prepared immediately on the user side, the replacement work requires highly skilled techniques. In other words, once the heater block containing the heater and temperature sensor is removed from the packaging machine for repair and replacement, the alignment and timing with other parts of the packaging machine must be adjusted to re-install the normalized heater block. Adjustment work is required. This operation is extremely difficult, and repair and replacement by the user at the packaging site is virtually impossible. In addition, there is a service situation in which immediate repair or replacement is impossible at night or in a remote place away from the manufacturer's service station. Therefore, if the packaging machine stops due to a failure of the heater or temperature sensor, it will be necessary to wait for the dispatch of an expert engineer and repair by the person in order to return the packaging machine to the normal state. There is a problem that it is reduced or the production plan of the packaged product on the user side is hindered.
[0008]
[Problems to be solved by the invention]
In order to cope with this situation, it is conceivable that the heater unit is duplicated by incorporating two sets of conventional heaters and temperature sensors in the heater block. However, it is impossible to incorporate two heaters and two temperature sensors in a single heater block, which is not practical. Therefore, without changing the size of the conventional heater block, the problem to be solved in that the heater and the temperature sensor are duplicated, and the operation of the packaging machine can be continued without immediately replacing the heater and the temperature sensor. There is.
[0009]
The object of the present invention is to repair or repair the heater or temperature sensor by the arrival of a highly skilled engineer without removing the heater unit from the packaging machine or immediately replacing the heater and the temperature sensor. Until the replacement, the heater unit for the packaging machine that allows the operation to continue without stopping the packaging machine for a long time while maintaining the heater unit mounted state, and the packaging machine that enables the temperature control of the heater unit for such a packaging machine A heater temperature control system is provided.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a heater unit for a packaging machine according to the present invention includes a heater having a heating element that generates heat by being supplied with power from outside, and a heat-welding packaging material that accommodates the heater inside and generates heat by the heater. The heater block is provided with a heating surface for causing a thermal action such as heat sealing or fusing, and the heating element is doubled in the heater.
[0011]
According to this packaging machine heater unit, since the heating element is duplicated in one heater, normally, the heating element is heated by supplying power to one heating element to generate heat. The block becomes hot, and the heating surface acts on the heat-weldable packaging material to heat seal or blow. When one heating element fails, the other heating element is supplied with power to generate heat, so that the heater and the heater block have the same effect as when one heating element generates heat. In the event of a heater failure, there is no need to remove the heater unit from the packaging machine, or to repair or replace the heater of the removed heater unit, so the packaging machine can continue to be used simply by switching the heating element to be energized. It is. At a later date, the packaging machine can be operated continuously until it is repaired or replaced by a skilled engineer belonging to the service station in accordance with regular maintenance of the packaging machine. Does not occur. In addition, the conventional heater block can be used as it is by making the outer shape of the heater the same as that of the conventional heater.
[0012]
In this packaging machine heater unit, a temperature sensor comprising a temperature measuring element and a measuring cord connected to the temperature measuring element for measuring the temperature of the heater block is housed in the heater block. In the temperature sensor, the temperature measuring element and the measurement cord are duplicated. According to this packaging machine heater unit, since the temperature measuring element and the measuring cord are duplicated in one temperature sensor, one temperature measuring element and the measuring cord are usually used for measuring the temperature of the heater block. Used for temperature control of the heater. When one temperature measuring element or measurement cord breaks down, the other temperature measuring element and measurement cord are used, so the temperature sensor can continue to measure temperature in a normal state without any failure. is there. With such a temperature sensor, the temperature of the packaging machine can be controlled only by switching the temperature measuring element or the measuring cord without removing the heater unit from the packaging machine or repairing or replacing the temperature sensor in the event of a heater failure. It is possible to continue operating in the state. At a later date, the packaging machine can continue to operate until it is repaired or replaced by a skilled engineer belonging to the service station in accordance with regular maintenance of the packaging machine. It does not occur. If the outer shape of the temperature sensor is the same as that of the conventional temperature sensor, the conventional heater block can be used as it is.
[0013]
In the heater temperature control system for a packaging machine according to the present invention , either one of the heater unit for the packaging machine and the normal cord for energization and the spare cord for energization can be selectively connected, and the regular use for measurement A heater temperature controller is provided to which either the cord or the measurement spare cord can be selectively connected. According to this heater temperature control system for packaging machines, the heating cord does not generate heat or the heating temperature rises excessively even though the normal cord for energization is connected to the heater temperature controller and the normal heating element is in a heat generating state. When a heater failure occurs, the power supply cord connected to the heater temperature controller is changed from a normal power supply cord to a standby power supply cord by changing the terminal, for example, so that the spare heating element is energized. Can generate heat. In addition, in the event of a temperature sensor failure where the temperature cannot be measured despite the fact that the temperature measuring element and the measuring cord are connected to the heater temperature controller, the measuring cord connected to the heater temperature controller is For example, by switching from the measurement regular cord to the measurement spare cord by changing the terminal, the spare temperature measuring element connected to the measurement spare cord can be used as the temperature sensor.
[0014]
In addition, the heater temperature control system for a packaging machine according to the present invention includes the heater unit for the packaging machine, the connection terminals to which the normal cord for energization and the preliminary cord for energization are respectively connected, the regular cord for measurement, and the measurement cord A heater temperature controller having a connection terminal connected to each of the spare cords, the heater temperature regulator being capable of switching the connection destination to either one of the normal cord for energization and the spare cord for energization and It is possible to switch to either one of the measurement common cord and the measurement spare cord. According to the heater temperature control system for a packaging machine, the heater temperature is adjusted in the event of a heater failure in which the normal heating element does not generate heat or rises to an excessive temperature despite being in a power supply state through the normal service cord. By switching the connection destination of the energization cord to the already-connected energization reserve cord in the device, the energization can be energized through the energization reserve cord to heat the reserve heating element. In addition, in the event of a failure in which temperature measurement becomes impossible despite the use of the common temperature measuring element and the common measurement cord connected thereto, the connection to the temperature sensor has already been established in the heater temperature controller. By switching to the measurement spare code among the connected measurement cords, the temperature of the heater block can be measured using the spare temperature measuring element through the measurement spare cord.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a heater unit for a packaging machine according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic view showing an embodiment of a heater unit for a packaging machine according to the present invention and an embodiment of a heater temperature control system for a packaging machine using the same. FIG. 3 is a schematic view showing an example of a heater and a temperature sensor used in the heater unit for packaging machines according to the present invention. In the packaging machine heater unit shown in FIG. 1 and the description related thereto, the conventional packaging machine heater unit shown in FIG. 4 and the terminal block to which it is connected and the heater temperature controller have the same function as shown in FIG. The same reference numerals as those used in FIG.
[0018]
The heater unit U1 for a packaging machine shown in FIG. 1 has a wire-like heat generation in which the heater 1 generates heat when energized, such as a nichrome wire, an iron chrome wire, or a Kanthal wire, as schematically shown in FIG. The bodies 2a and 2b are arranged in duplicate, have a structure in which they are embedded in a material such as ceramics and fired into a rod shape, and two pairs for supplying power to the heat generators 2a and 2b at the ends of the heat generators 2a and 2b (A total of four) energization cords 3a and 3b are connected and extend to the outside. One heating element is the regular heating element 2a, and the energizing cord connected to the regular heating element 2a is the energizing regular cord 3a. The other heating element is a spare heating element 2b used when the regular heating element 2a becomes unusable, and the energizing cord connected to the spare heating element 2b is an energizing spare cord 3b.
[0019]
The temperature sensor 5 used in the packaging machine heater unit U1 for measuring the temperature of the heater block 4 includes a pair of thermocouples 6a and 6b that generate an electromotive force depending on the temperature, and both thermocouples 6a and 6b. Two pairs (four in total) of measurement cords 7a and 7b that are connected and extend to the outside are provided. One thermocouple is a regular thermocouple 6a as a regular temperature measuring element, and one measurement (temperature measurement) cord connected to the regular thermocouple 6a is a regular measurement cord 7a. The other thermocouple is a backup thermocouple 6b as a backup temperature measuring element used when the service thermocouple 6a becomes unusable, and the other thermocouple is connected to the backup thermocouple 6b. The temperature measuring code is a measuring spare cord 7b. In addition, as a temperature measuring element in the temperature sensor 5, elements such as a platinum temperature measuring resistor and a thermistor can be used instead of the thermocouple.
[0020]
In the packaging machine heater temperature control system S1 shown in FIG. 1, the energizing service cord 3a and the measuring service cord 7a are connected to the terminal block 8, respectively. In the terminal block 8, the energizing service cord 3a is connected for energization. The cord 9 is connected to the measuring connection cord 10 to the measuring cord 7 a and is connected to the energizing output terminal 21 and the measuring input terminal 22 of the heater temperature controller 20, respectively. A power supply 11 is connected to the two energization connection cords 9, and a relay 12 is interposed across both the energization connection cords 9. Since these structures are the same as those shown in FIG. 4 and the temperature control action by the heater temperature controller 20 is the same, the description thereof will be omitted.
[0021]
In the present system S1, the energization spare cord 3b and the measurement spare cord 7b of the packaging machine heater unit U1 are not connected to the terminal block 8, and are normally in an unconnected state where they are not connected anywhere. In the packaging machine, the heater 1 and the temperature sensor 5 normally use a regular heating element 2a and a regular use cord 3a, a regular thermocouple 6a, and a regular measurement cord 7a. If a failure such as disconnection occurs in the heater 1 or the temperature sensor 5 during use, the heater temperature controller 20 notifies the operator or the like to that effect. The operator removes the energizing normal cord 3a or the measuring normal cord 7a from the terminal block 8, and instead connects the energizing spare cord 3b or the measuring spare cord 7b, thereby the auxiliary heating element 2b and the auxiliary thermoelectric device. Pair 6b is used. Since the spare side elements and cords are considered to function normally, the operator does not need to remove the heater unit U1 from the packaging machine or immediately replace the heater 1 and the temperature sensor 5 and stop the packaging machine for a long time. It is possible to continue the packaging operation without causing it to occur. In this method, if the outer shape of the heater and the temperature sensor is not changed, the structure of the heater block 4 having the heating surface 4a and the terminal block 8 and the heater temperature controller 20 do not need to be changed. Since the system can be used without greatly changing the system, it is possible to realize a countermeasure at the time of failure at a low cost, which is realistic and practical. When operating with switching to the spare side element and cord, the heater and temperature sensor may be serviced by the manufacturer's service station for repair or replacement in accordance with the downtime or periodic check of the packaging machine. it can.
[0022]
FIG. 2 is a schematic view showing another embodiment of the heater unit for packaging machine according to the present invention and another example of the heater temperature control system for packaging machine using the same. In the packaging machine heater unit U2 and the packaging machine heater temperature control system S2 shown in FIG. 2, instructions are particularly given to parts having the same functions as the packaging machine heater unit U1 and the packaging machine heater temperature control system S1 shown in FIG. 1. As long as it is not, the same reference numerals are given, and the description thereof is omitted. The packaging machine heater unit U2 shown in FIG. 2 has the same structure as the packaging machine heater unit U1 shown in FIG. In the example shown in FIG. 2, the terminal block 18 and the heater temperature controller 24 have a number of terminals that can connect all the cords for normal use and spare use, and the terminal block 18 and the heater temperature adjuster 24. 1 is different from the terminal block 8 and the heater temperature controller 20 shown in FIG. 1 in that each is connected with a connection cord for energization and measurement. That is, for the heater 1, both the normal and spare current-carrying cords 3 a and 3 b are always connected via the terminal block 18 and the current-carrying connection cords 13 and 14 to the current-carrying output terminal of the heater temperature controller 24. 25, 26. As for the temperature sensor 5, both the regular and spare measurement cords 7 a and 7 b are always input to the heater temperature controller 24 via the terminal block 18 and the measurement connection cords 15 and 16. Connected to terminals 27 and 28.
[0023]
According to the packaging machine heater temperature control system S2, normally, the heater 1 and the temperature sensor 5 of the packaging machine heater unit U2, the heating element 2a on the normal side, the energization cord 3a, the energization connection cord 13, and The temperature measuring element (thermocouple 6a), measuring cord 7a, and measuring connecting cord 15 are used. When the system on the normal side fails due to disconnection or the like, the heater temperature controller 24 automatically and instantly Switch from the regular system to the standby system. That is, from each element and cord for normal use, to the heating element 2b for spare, the cord 3b for energization and the connection cord 14 for energization, the temperature measuring element (thermocouple 6b), the measurement cord 7b and the connection cord 16 for measurement. Can be switched. According to this method, not only the heater 1 and the temperature sensor 5 but also the terminal block 18 and the heater temperature controller 24 need to be changed in configuration, so that the scale of the change becomes large, but the switching work by the operator is not necessary. It is excellent in that the system can be automatically switched instantaneously. Even when the regular side is being used, it is possible to check whether the spare element and the cord are normal or not. When one circuit of the heater 1 or the temperature sensor 5 is disconnected or the heater block 4 breaks down, the heater temperature adjuster 24 notifies the operator of the portion and content of the failure. When the system is switched based on the notification, the operator can make a request for replacement of the heater 1 or the temperature sensor 5 by contacting the manufacturer's service department to that effect.
[0024]
In the description of the embodiment based on the description of the above drawings, the heater block 4 has a bar-like structure, that is, an example of a heater bar. However, a heater block having a spot-type heating surface, or a peripheral surface is a heating surface. It is obvious that the heating roller and the temperature sensor mounted inside the heating member can be duplicated in the rotary roller type heater block.
[0025]
【The invention's effect】
As described above, the heater unit for a packaging machine according to the present invention includes a heater having a heating element that generates heat when supplied with power from the outside, and heat-seals the heat-weldable packaging material by housing the heater inside and generating heat from the heater. or a heater block with the heated surface for causing a thermal effect of fusing such, duplicated the heating element in the heater, also since the duplicated temperature sensor is housed in the heater block, a heater and a temperature Even if the sensor breaks down due to disconnection, etc., it is not necessary to remove the heater unit from the packaging machine or replace the heater or temperature sensor with a normal product. it can. In addition, a heater temperature control system for a packaging machine using such a heater unit does not stop the operation of the packaging machine or immediately repair or replace the temperature sensor even if the heater or the temperature sensor fails due to disconnection or the like. By switching the temperature measuring element and the cord to be used for the spare, the packaging machine can be continuously operated while the heater temperature is controlled in the spare system until the repair and replacement upon arrival of a highly skilled engineer. In other words, the user has the advantage that the operation of the packaged product is not interrupted without stopping the packaging machine, and the manufacturer can easily make a repair / replacement work schedule especially in the service department. Therefore, it is possible to provide a maintenance system that is advantageous for both users and manufacturers.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of a heater unit for a packaging machine according to the present invention and an embodiment of a heater temperature control system for a packaging machine using the same.
FIG. 2 is a schematic view showing another embodiment of a heater unit for a packaging machine according to the present invention and another embodiment of a heater temperature control system for a packaging machine using the same.
FIG. 3 is a schematic view showing a heater and a temperature sensor used in a packaging machine heater unit according to the present invention in comparison with a heater and a temperature sensor used in a conventional packaging machine heater unit.
FIG. 4 is a schematic view showing an example of a conventional packaging machine heater unit and an example of a packaging machine heater temperature control system using the same.
[Explanation of symbols]
U1, U2 Heating unit for packaging machine S1, S2 Heater temperature control system for packaging machine 1 Heater 2a Heating element for normal use 2b Heating element for spare 3a Powering cord for current supply 3b Powering spare code 4 Heater block 4a Heating surface 5 Temperature sensor 6a Normal use Thermocouple 6b Spare thermocouple 7a Measurement cable 7b Measurement cable 8, 18 Terminal block 9, 13, 14 Connection cable 10, 15, 16 Connection cable 11 Power supply 12 Relay 20, 24 Heater temperature adjustment 21, 25, 26 Energization output terminal 22, 27, 28 Measurement input terminal

Claims (3)

A heater having a heating element that is supplied with power from the outside and generates heat, and a heating surface that houses the heater inside and causes the heat-welding packaging material to perform a thermal action such as heat sealing or fusing by the heat generated by the heater. a heater block, the heater is formed in the rod-like body of one of the heating element is embedded is duplicated internally duplexed the heating element is in the conventional heating element and the spare heating element An energizing normal cord or an energizing spare cord is connected to each of the regular heating element and the auxiliary heating element,
Further, a temperature sensor comprising a temperature measuring element and a measurement cord connected to the temperature measuring element for measuring the temperature of the heater block is accommodated in the heater block, and the temperature sensor is The temperature measuring element and the measurement cord are formed in a single rod-like body which is doubled inside, and the doubled temperature measuring element is a normal temperature measuring element and a spare temperature measuring element. A heater unit for a packaging machine, comprising a measuring common cord or a measuring preliminary cord connected to each of the temperature element and the preliminary temperature measuring element . Packaging machine heater unit according to 請 Motomeko 1, and, wherein with one of the current for a service code and pre-codes for energization can be selectively connected, customary code and pre-codes for the measuring the measuring A heater temperature control system for a packaging machine, comprising a heater temperature controller to which any one of the above can be selectively connected. 請 Motomeko packaging machine heater unit according to 1, and connected to the current supply common code and pre-codes for energization and connection terminals which are connected respectively, the measurement for a service code and pre-codes for the measurement is connected respectively A heater temperature controller having a terminal , wherein the heater temperature controller is capable of switching the connection destination to one of the energizing normal cord and the energizing spare cord, and the measuring common cord and the measuring cord A heater temperature control system for a packaging machine comprising switching to either one of the spare cords .

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