KR100799925B1 - Sealer with improved vacuum sealing function - Google Patents

Abstract

A heat sealer with an improved vacuum sealing function is provided to prevent the degree of vacuum of an envelope from being deteriorated by closely contacting an upper sealing bar and a lower sealing bar through a balloon. A heat sealer with an improved vacuum sealing function includes an upper sealing bar(8), a lower sealing bar(4), a pair of lift cylinders(20), and a balloon(41). The upper sealing bar moves up by the pair of lift cylinders. The pair of lift cylinders are composed of a double acting cylinder of which an ascent line and a descent line(26) are connected by a separate path. Ascent and descent solenoid valves(30,32) are separately installed between the ascent and descent lines. A coil spring(22) is installed inside of the lift cylinder. The balloon is installed on a surface of the lower sealing bar, which is in contact with the upper sealing bar. The balloon is swelled by compressed air supplied through an air supply line(43). The air supply line includes a hydraulic detecting sensor(49). The hydraulic detecting sensor maintains the compressed air with uniform pressure.

Description

Sealing with improved vacuum sealing function

BRIEF DESCRIPTION OF THE DRAWINGS The pneumatic circuit diagram of the sealing bar which shows the structure of the principal part of this invention.

2 is a block diagram showing a control relationship of the present invention.

3 is a control flowchart showing the operational relationship of the device of the present invention;

Figure 4 is a partial perspective view showing the upper sealing bar side configuration in a conventional heat sealing device.

<Description of the symbols for the main parts of the drawings>

4: lower sealing bar 8: upper sealing bar

20: lifting cylinder 22: coil spring

24: piston 26: descending line

28: rising line 30: rising solenoid valve

32: descending solenoid valve 34, 36: speed control valve

38: pneumatic line 40: regulator

41: balun 42: air filter

43: supply line 44: upper position detection sensor

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45: speed control valve 46: intermediate position detection sensor

47: Air supply solenoid valve 48: Lower position detection sensor

52: through air 54: lock pin

56: lock actuator 58: microcomputer

60: operation switch

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The present invention relates to a heat sealing device having a pair of sealing bars for pressing and fixing an opening of a heat-sealed envelope from above and below and heat-bonding, and a nozzle for exhausting air in the bag before heat-bonding, in particular formed by the nozzle. The present invention relates to a heat sealing device having an improved vacuum sealing function by being configured to increase the degree of vacuum.

The heat sealing device is a device for heat-sealing and sealing an envelope containing an object to be stored, and has been widely applied to packaging of food, machinery parts, semiconductor devices and the like.

As for the conventional structure of this kind of heat sealing apparatus, as shown in FIG. 4, the lower sealing bar 4 which supports an envelope to one side edge of the base 2 is fixedly arrange | positioned, and the upper and lower sides are supported by the arm 6 above the opposite side. The upper sealing bar 8 which pushes the upper surface of the bag while being operated is arranged to be liftable, while the pressing plate 10 is provided together with the upper sealing bar 8 and the inlet of the bag is the pressing plate 10 and its It is thermally bonded while being pressed between the lower band heater 12, and in this process, the nozzle 14, which emerges between the upper side and the lower sealing bar 6, 4, discharges the air inside the bag to be formed in a vacuum.

When the upper sealing bar 8 presses the lower sealing bar 4 during the above-described thermal bonding process, the nozzle 14 extending therebetween starts to suck out the air inside the bag, and exhausts it to a predetermined vacuum. At this time, the nozzle 14 exits the bag and at the same time, heat sealing is started between the pressing plate 10 and the band heater 12.

In the heat sealing process performed in this way, the vacuumization of the bag by the nozzle 14 has a limit, and the high vacuum degree more than a predetermined | prescribed is not acquired.

The cause of the bag is a structure in which the inlet of the bag is in close contact with the upper and lower sealing bars (8) and (4), the pressing plate 10 and the band heater (12). In reality, there is a micro gap in the contact surface between them, which inevitably causes vacuum packing to be lower than the initial degree of vacuum during heat-sealing packaging.

Vacuum packaging of bags has the advantage of minimizing the volume of the package, but in the case of food packaging, vacuum packaging is also preferred because of the effect of blocking the oxygen supply to the deterioration of food.

However, due to the above-mentioned problem of lowering the degree of vacuum, the complete vacuum packaging of food packaging is not realized.

In particular, in the case of vacuum packaging a large bag having a width of 2600 mm, the above-described problems are clearly revealed, so that the vacuum packaging required by the user may not be realized.

The present invention has been made in view of the above-described conventional heat sealing apparatus, in order to solve the problem of vacuum degree, to provide a heat sealing apparatus having an improved vacuum sealing function by improving the airtight structure between the upper and lower sealing bars. have.

The present invention for realizing the above object is to insert the inlet of the bag between the upper and lower sealing bar to seal the heat seal, the upper sealing bar is a heat sealing device having a configuration of lifting and lowering by a pair of lifting cylinder, A balun is installed on a surface where the lower sealing bar is in contact with the upper sealing bar, and the balun is expanded by supplying compressed air of a pneumatic line to the balun, and hydraulic pressure for preserving the compressed air supplied to the balun at a predetermined pressure in the air supply line. The detection sensor is provided.

In the above configuration, the pair of lifting cylinders arranged to lift the upper sealing bar have a through hole in the piston rod, and the through pin is provided with a lock pin for forward and backward operation corresponding to the upper and lower sides. It may further include a configuration to maintain and maintain a close contact between the sealing bar.

In another aspect, the present invention is a device for inserting and pressing the seal of the bag between the upper and lower sealing bars to heat seal, wherein the upper sealing bar is a heat sealing device configured to lift and interlock by a pair of lifting cylinder, the lifting cylinder The upper position detection sensor, the intermediate position detection sensor, and the lower position detection sensor are disposed on the outer circumference of the cylinder, and the piston rod of the lifting cylinder has a through hole in which a lock pin for forward and backward operation is fitted by a lock actuator. Balun is provided on the contact surface of the lower sealing bar, and the lifting cylinder and the balun supply compressed air of the pneumatic line through the up / down line and the air supply line, which are controlled by the up / down solenoid valve and the air supply solenoid valve, respectively. In addition, the upper position detection sensor, the middle position detection sensor, the lower position detection According to the detection signal of the sensor and the input signal of the operation switch through the operator, the microcomputer controls the up / down solenoid valve and the air supply solenoid valve to connect the air supply solenoid valve to the pneumatic line with the ON signal of the intermediate position detection sensor. In addition, the lock actuator may be implemented to control forward movement to the ON signal of the lower position detection sensor.

In another aspect, the present invention is a device for sealing and pressing the inlet of the bag between the upper and lower sealing bar, the upper sealing bar is a heat sealing device configured to move up and down by a pair of lifting cylinder, the lock actuator at the beginning of operation Step 1 in which the lock pin is released from the through hole by the reverse operation, the rising solenoid valve is connected to the pneumatic line, and the lower solenoid valve is opened to the atmosphere so that the upper sealing bar is located at the top dead center; In step 1, the microcomputer determines whether the upper position detection sensor is an on signal and the intermediate position detection sensor and the lower position detection sensor are off signals; A step 3 in which the microcomputer crosses the rising solenoid valve and the falling solenoid valve in a standby state in step 2; Step 4 for judging whether the on signal of the operation switch by the operator is input; Step 5, when the on signal of the operation switch is input in step 4, the microcomputer opens both solenoid valves to the atmosphere so that the piston lowers the upper sealing bar by the elasticity of the coil spring; Step 6, wherein the microcomputer determines whether the on-signal of the intermediate position detection sensor is inputted by the falling stop of the upper sealing bar by the coil spring; A step 7 in which the microcomputer crosses both solenoid valves and stops the lowering of the piston and waits in the step 6; Step 8, the microcomputer determines whether a signal from the operation switch is input; A step 9 of connecting the lower solenoid valve to the pneumatic line and opening the rising solenoid valve to the atmosphere when the ON signal of the operation switch is input in step 8 to continue the lowering operation of the upper sealing bar; Step 10 for determining whether a piston detection signal of the lower position detection sensor is input after the step 9; In step 10, when the ON signal of the lower position detection sensor is input, the microcomputer advances both lock actuators so that the lock pin is fitted into the through hole of the piston rod and is fixed, and the normal heat sealing is performed according to the stored program. The configuration is controlled in the order of 11.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a pneumatic circuit diagram showing the configuration of the main part of the present invention, wherein the upper sealing bar 8 is supported by a pair of lifting cylinders 20, which can lift and interlock, and the lower sealing bar 4 is fixedly installed. .

The lifting cylinder 20 is provided with a coil spring 22 therein, which is installed in a position capable of pushing down the built-in piston 24.

In addition, the pair of lifting cylinders 20 are double acting cylinders having a lowering line 26 and a rising line 28 separately, and the two lines 26 and 28 are dedicated solenoid valves 30 and 32 respectively. And the speed control valves 34 and 36 are connected in parallel to the pneumatic line 38.

The speed regulating valves 34 and 36 may use a conventional one configured by pairing a check valve and a flow control valve, which control the amount of compressed air supplied through the pneumatic line 38 so as to control the lift cylinders. 20 is driven at a constant speed, and the fluid supplied through the solenoid valves 30 and 32 is supplied to both lifting cylinders 20 through the flow control valve, on the contrary, the fluid discharged from the lifting cylinder 20 is Exhaust through the check valve.

The pneumatic line 38 is supplied with compressed air generated by the regulator 40 via the air filter 42.

On the other hand, the upper position detection sensor 44, the intermediate position detection sensor 46, the lower position detection sensor 48 is disposed at the positions corresponding to the upper and lower positions of the lifting cylinder 20, respectively.

All of these sensors are proximity sensors that detect the current position of the piston 24 embedded in the lifting cylinder 20.

The lower sealing bar 4 is provided with a balloon 41 on a surface which is in contact with the upper sealing bar 8.

The compressed air of the pneumatic line 38 is supplied to the balloon 41 through a separate air supply line 43, thereby expanding the balloon 41. Similarly, the air supply line 43 is provided with the speed control valve 45 which consists of a check valve and a flow control valve, and the air supply solenoid valve 47 on the way.

In the present invention, it is preferable to set the balloon 41 to be always kept inflated at a suitable air pressure, for example, 2 Kg / cm 2. For this purpose, the air supply line 43 has a hydraulic detection sensor 49 and its on-off signal. The air supply solenoid valve 47 is configured to open and close.

 In addition, each piston rod 50 extending outwardly from both cylinders 20 has a through hole 52, and a lock actuator 56 having a lock pin 54 is disposed around the piston rod 50.

The lock pin 54 is to be moved forward and backward by the lock actuator 56, the upper sealing bar 8 is pushed forward in the position that is in close contact with the lower sealing bar (4) is fitted into the through hole (52). .

The lock actuator 56 can be applied in any manner as long as the lock pin 54 can be moved backward and backward. Examples of the lock actuator 56 include a means that is operated by pneumatic or electromagnetic force.

Figure 2 is a block diagram showing the control relationship of the heat sealing device with a safety bar lifting function of the present invention having the above configuration.

The detection signals of the upper position detection sensor 44, the intermediate position detection sensor 46, and the lower position detection sensor 48 arranged on the outer circumference of the lifting cylinder 20 are input to the microcomputer 58, and also the microcomputer 58 The controller also receives a signal from the operation switch 60 operated by the operator and processes the data, and controls the rising / falling solenoid valves 30 and 32 to operate in opposite directions, while the ON signal of the intermediate position detection sensor 46 is controlled. Control of the lock actuator 56 to move the lock pin 54 forward in conjunction with the air supply solenoid valve 47 in communication with the pneumatic line 38 and in response to the ON signal of the lower position detection sensor 48. do.

The operation switch 60 is sufficient as a conventional touch switch that can be operated by hand or foot.

The operation relationship of the heat sealing device with the sealing bar safety lifting function of the present invention having such a configuration will be described according to the control flowchart of FIG. 3.

At the beginning of operation, both lock actuators 56 are reversed so that the lock pin 54 is released from the through hole 52, while the rising solenoid valve 30 is connected to the pneumatic line 38 and the lower solenoid valve 32 The upper sealing bar 8 is located at the top dead center by both lifting cylinders 20 as) is opened to the atmosphere. (Step 1)

At this position, the microcomputer 58 determines whether the upper position detection sensor 44 is the on signal and the intermediate position detection sensor 46 and the lower position detection sensor 48 are each an off signal. (Step 2)

When the condition of step 2 is satisfied, the microcomputer 58 crosses both the rising solenoid valve 30 and the falling solenoid valve 32 and maintains the standby state until the signal of the operation switch 60 is input. (Step 3)

At this time, when the upper sealing bar (8) is at the top dead center, the coil spring (22) inside the two lifting cylinders (20) is placed in a suppressed state by the piston (24).

After step 3, the microcomputer 58 determines whether the on signal of the operation switch 60 through the operator is input. (Step 4)

When the ON signal of the operation switch 60 is input in step 4, the microcomputer 58 opens both solenoid valves 30 and 32 to the atmosphere, and at the same time, the air supply solenoid valve 47 is connected to the pneumatic line 38. Let's do it. (Step 5)

In step 5, the elasticity of the coil spring 22 acts so that the piston 24 lowers the upper sealing bar 8, at which time the balloon 41 of the lower sealing bar 4 is kept inflated at a set pressure. The lowering of the upper sealing bar 8 continues until the elasticity of the coil spring 22 disappears and then stops, and at the stop position, the intermediate position detection sensor 46 causes the piston 24 to detect the piston 24. The received signal is inputted to the microcomputer 58. (Step 6)

The microcomputer 58 crosses both solenoid valves 30 and 32 when the ON signal of the intermediate position detection sensor 46 is input in step 6.

Accordingly, the balloon 41 is maintained in an inflated state at a set pressure, and both cylinders 20 wait in a state in which the piston 24 can no longer move, and this state is activated by the operation switch 60. ) Is continued until the signal is input. (Step 7)

In the standby state of step 7, the microcomputer 58 determines whether the signal from the operation switch 60 is input. (Step 8)

When the ON signal of the operation switch 60 is input in step 8, the microcomputer 58 connects the lower solenoid valve 32 to the pneumatic line 38, and opens the upper solenoid valve 30 to the atmosphere to open the upper sealing bar ( The lowering operation of 8) is performed. (Step 9)

When the upper sealing bar 8 operates in this way and reaches the bottom dead center, the lower position detection sensor 48 detects the piston 24 and inputs an on signal to the microcomputer 58. (Step 10)

In addition, the inlet of the envelope to be heat sealed is pressed by the upper sealing bar (8) located in the downward direction at this time is in contact with the balun 41 of the lower sealing bar (4) between the two sealing bars (8) (4) The contact is made at a uniform pressure over.

After the step 10, when the on signal of the lower position detection sensor 48 is input to the microcomputer 58, the microcomputer 58 advances both lock actuators 56 to the through hole 52 of the piston rod 50. The lock pin 54 is fitted and secured, and then the normal heat sealing is performed according to the input program. (Step 11)

The heat sealing is performed by suctioning and discharging air in the bag and heat sealing the inlet as in the conventional heat sealing apparatus.

In this process, the upper sealing bar 8 is fixed by the lock pin 54 to maintain a close contact with the lower sealing bar 4, and at the same time the balloon 41 of the lower sealing bar 4 is The contact between the sealing bar 8 and the upper sealing bar 8 and the lower sealing bar (4) is in close contact with a uniform pressure throughout.

Therefore, according to the present invention, since the internal vacuum through the nozzle proceeds in a state where there is no fine gap throughout the inlet of the envelope, the vacuum degree of the envelope does not decrease during the heat sealing process.

In this heat sealing process, the microcomputer 58 crosses all the rising / falling solenoid valves 30 and 32 and maintains the T seconds required for the heat sealing.

When the step 11 is finished, the microcomputer 58 reversely operates the lock actuator 56 so that the lock pin 54 exits the through hole 52 and the rising solenoid valve 30 is connected to the pneumatic line 38. Simultaneously with connection, the lower solenoid valve 32 returns to the state of step 1 of opening, and repeats the above-described process.

In addition, the position detection signal of the piston 24 input by the intermediate position detection sensor 46 in the process of raising the upper sealing bar 8 may be set to be ignored by the microcomputer 58.

As described above, the heat sealing device having the improved vacuum sealing function of the present invention is locked between the upper sealing bar and the lower sealing bar by the lock pin during the heat sealing process, and at the same time, the upper sealing bar and the lower sealing bar are entirely separated by the balun. Since it is in close contact with the uniform pressure over, the vacuum of the bag does not leak through the micro clearance between the said upper sealing bar and the lower sealing bar.

Therefore, the present invention has the advantage of being able to be packaged while maintaining a high degree of vacuum that cannot be realized in conventional devices.

Claims (4)

An apparatus for inserting and pressing a seal of an envelope between upper and lower sealing bars to heat seal the device, wherein the upper sealing bar is configured to move up and down by a pair of lifting cylinders. The lower sealing bar is provided with a balun on a surface facing the upper sealing bar, the balun is inflated by the compressed air supplied through the air supply line in communication with the pneumatic line, the compressed air supplied to the air supply line to the balun Heat sealing device with improved vacuum sealing, including a configuration with a hydraulic detection sensor to maintain the pressure at a constant pressure. The pair of elevating cylinders arranged for elevating the upper sealing bar have a through hole in the piston rod, and the upper and lower seals are provided with corresponding lock pins for forward and backward operation by a lock actuator. Heat seal with improved vacuum sealing further comprising a configuration that maintains tight contact between bars. An apparatus for inserting and pressing a seal of an envelope between upper and lower sealing bars to heat seal the device, wherein the upper sealing bar is configured to move up and down by a pair of lifting cylinders. An upper position detection sensor, an intermediate position detection sensor, and a lower position detection sensor are respectively disposed on the outer circumference of the elevating cylinder, and the piston rod of the elevating cylinder has a through hole in which a lock pin for forward and backward operation is fitted by a lock actuator. And, the contact surface of the lower sealing bar is provided with a balun, the lifting cylinder and the balun is compressed by the pneumatic line through the up / down line and the supply line which is controlled by the up / down solenoid valve and the air supply solenoid valve, respectively In addition to being supplied with air, the microcomputer operates the up / down solenoid valve and the air supply solenoid valve according to the detection signal of the upper position detection sensor, the intermediate position detection sensor, the lower position detection sensor, and the input signal of the operation switch through the operator. Air supply solenoid by the on signal of the intermediate position detection sensor A heat sealing device with an improved vacuum sealing function, comprising a configuration in which the id valve is connected to the pneumatic line, and the lock actuator is controlled to move forward with the on signal of the lower position detection sensor. An apparatus for inserting and pressing a seal of an envelope between upper and lower sealing bars to heat seal the device, wherein the upper sealing bar is configured to move up and down by a pair of lifting cylinders. Step 1 in which the lock actuator is retracted at the beginning of operation so that the lock pin is pulled out of the through hole, the rising solenoid valve is connected to the pneumatic line and the lower solenoid valve is open to the atmosphere so that the upper sealing bar is located at the top dead center; In step 1, the microcomputer determines whether the upper position detection sensor is an on signal and the intermediate position detection sensor and the lower position detection sensor are off signals; A step 3 in which the microcomputer crosses the rising solenoid valve and the falling solenoid valve in a standby state in step 2; Step 4 for judging whether the on signal of the operation switch by the operator is input; Step 5, when the on signal of the operation switch is input in step 4, the microcomputer opens both solenoid valves to the atmosphere so that the piston lowers the upper sealing bar by the elasticity of the coil spring; Step 6, wherein the lowering of the upper sealing bar by the coil spring is stopped so that the piston detection signals of the intermediate position detection sensor are input to the microcomputer, respectively; A step 7 in which the microcomputer crosses both solenoid valves to stop the lowering of the piston and wait in the step 6; Step 8, the microcomputer determines whether a signal from the operation switch is input; A step 9 of connecting the lower solenoid valve to the pneumatic line and opening the rising solenoid valve to the atmosphere when the ON signal of the operation switch is input in step 8 to continue the lowering operation of the upper sealing bar; Step 10 for determining whether a piston detection signal of the lower position detection sensor is input after the step 9; In step 10, when the ON signal of the lower position detection sensor is input, the microcomputer advances both lock actuators so that the lock pin is fitted into the through hole of the piston rod and is fixed, and the normal heat sealing is performed according to the stored program. 11; Heat seal with improved vacuum sealing, including controlled configuration in order.

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