JP3708333B2 - Method and apparatus for storing vacuum valve lubricated surface - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for suppressing oil shortage on a sliding surface of a rotary valve, that is, a lubricating surface in a rotary type vacuum packaging apparatus.
[0002]
[Problems of the prior art]
Containers filled with food and other items to be packaged are stored one after another in a number of pressure-resistant chambers that move along endless tracks at equal intervals, and the containers are sequentially sealed in a vacuum environment in each pressure-resistant chamber. A rotary vacuum packaging machine that wraps an article to be packaged connects one or two vacuum pumps and a number of chambers with a foot-shaped circuit, and sequentially rotates each chamber by rotating a rotary valve. However, when the power switch is cut to stop or end the operation of the vacuum packaging machine, among the stopped chambers, a plurality of closed chambers ensure a vacuum inside. Stop in state. On the other hand, in general, a rotary valve that slides two discs to communicate each chamber with a vacuum pump holds an appropriate amount of lubricating oil on the lubrication surface between the discs in order to maintain airtightness. When the chamber is stopped for a long time in the vacuum state as described above, the lubricating oil is pulled in the chamber direction over time due to the influence of the differential pressure.
[0003]
The oil on the valve lubrication surface during operation is repeatedly leveled by the slide of the two discs. However, during the stoppage, a local oil drainage phenomenon occurs on the slide surface, preventing airtight damage at each re-operation. In addition, it is necessary to replenish the oil in order to keep the food in a good condition, and although not so noticeable, there is a problem that the chamber in which the food is packaged is soiled by the oil film for a long period of time.
[0004]
An object of the present invention is to keep airtightness in a rotary valve and to prevent oil contamination of a chamber and the like, which are not generally performed due to inconvenience.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
In the method of the present invention, containers filled with articles to be packed one after another are accommodated one after another in a number of pressure-resistant chambers that move along an endless track at equal intervals, one or a plurality of vacuum pumps, A rotary vacuum packaging machine in which the chambers are sequentially connected to the vacuum pump by a rotary valve, and the containers are sequentially sealed in a vacuum environment in each pressure-resistant chamber. In order to prevent the vacuum from acting on the extra chamber, the on-off valve provided in the line connecting the vacuum pump and the rotary valve is closed with a preliminary signal generated by the device for counting the number of movements of the pressure chamber. To do. Then, after a certain period of time after the preliminary signal is transmitted, the secondary signals transmitted by the relay action are used to stop the respective rotary motions of the chambers and the rotary valves. In addition, all the vacuum packaged products are discharged out of the chamber, and the high vacuum is not maintained even in the closed chamber.
[0006]
Moreover, the negative pressure in the chamber can be eliminated more completely by opening the opening / closing valve and the rotary valve to the atmosphere simultaneously with the closing of the opening / closing valve.
[0007]
The apparatus of the present invention includes a number of pressure-resistant chambers that move at equal intervals along an endless track, a rotary valve that operates in conjunction with each pressure-resistant chamber, and one or a plurality of pressure-resistant chambers via the rotary valve. A rotary vacuum packaging machine comprising: a vacuum line connecting a vacuum pump; and a container for containing an object to be packaged in a vacuum environment in each pressure-resistant chamber, wherein the vacuum pump, the rotary valve, A normally open type on-off valve provided in the vacuum line between the counter, a counting device for checking the number of each pressure-resistant chamber movement, and the on-off valve with a preliminary signal transmitted when the counting device counts up Means for closing and a rotary valve with a secondary signal transmitted by relay action after a certain time of the preliminary signal transmission. And constituting a means for stopping each of the motion of the chamber.
[0008]
【Example】
The apparatus shown in a plan view in FIG. 2 has a rotary valve 10 formed by stacking two disks on the upper and lower sides, two vacuum pump connection holes 11 and 12 formed on the upper plate, and a dotted line on the lower plate. 8 ports 13 are formed, and a pressure-resistant chamber 14 is connected to each port.
[0009]
As shown in cross section in FIG. 1, the apparatus has a bearing 18 standing on a machine base 15 rotatably supporting a main shaft 17 supporting a rotary valve 10 at an upper end and a gear 18 fixed to the lower end of the main shaft. Further, a pinion 20 fixed to the driving shaft 19 is engaged. When the rotational power of the pinion 20 is transmitted to the gear 18, the main shaft 17 integrally rotates the lower movable plate 21 and the chamber 14, but the fixed plate 24 fixed to the machine base 23 via the bracket 22 does not rotate. On the other hand, the connection hole 11 of the fixing plate 24 and the vacuum pump 25 are connected by a flexible line 26 such as a plastic hose, and a normally open type electromagnetic opening / closing valve 27 is interposed in the line 26.
[0010]
The pressure-resistant chamber 14 supported on the movable plate 21 via the cylindrical arm 30 includes a main body 31 and a lid plate 33 supported on the main body via a pin 32 so as to be opened and closed. The link 34 moves up and down by the action of the groove cam, and the lever 35 opens and closes the lid plate 33. A bag or container 36 filled with an article to be packaged is suspended in the chamber by a clamp 37, and an actuator 38 fixed to the cover plate is configured to operate a seal bar 39.
[0011]
In FIG. 2, a bag filled with an article to be packaged is fed into the chamber 14 in which the cover plate is opened in the region A. When the chamber moving in the counterclockwise direction reaches the region B, the cover plate is closed. In the regions C and D, the port 13 is connected to the vacuum pump connection holes 11 and 12, so that the inside of the chamber 14 changes to a vacuum environment. In the E region, the bag mouth is overheat-sealed, and after the bag mouth is cooled in the F and G regions, the vacuum package is released out of the chamber by opening the cover plate in the H region.
[0012]
In FIG. 3, the encoder 41 connected to the main shaft 17 of the vacuum packaging machine inputs the generated pulses to the counting device 42 and mechanically counts the number of movements of the chamber 14 in FIG. The pulse can be generated by the cam 43 and the micro switch 44 fixed to the main shaft, or the movement of the chamber can be directly checked by a sensor.
[0013]
The input device 45 in FIG. 1 corresponds to the number input means 47 in FIG. 3, and when the set number is numerically input to the controller 46 by the input device 45 in FIG. 1, the controller 46 is transmitted from the counting device 42. When the count number reaches the set number S1 as shown in FIG. 3, a preliminary signal S2 is transmitted to the on-off valve switching means 48. That is, in FIG. 1, the opening / closing valve 27 is closed by the instruction signal 49 from the controller 46, and the vacuum suction to the chamber 14 is stopped. After that, until the release of all the vacuum packaged products in the chamber, the movement of the chamber is continued by the rotation maintaining means 50 in FIG. 3, and the operation stopping means 51 is operated by the secondary signal S3 transmitted after a predetermined time. , Stop the movement of each chamber. Therefore, any negative pressure in the closed chamber is eliminated.
[0014]
The normally open on-off valve 27 shown in FIG. 4 has an atmospheric suction line 61 in the direction of the rotary valve 10 at the closed position 60. Therefore, when the vacuum line 26 is cut, a vacuum remains in the atmosphere flowing into the line 26. Is prevented.
[0015]
【effect】
There is no local oil-drying phenomenon on the lubrication surface of the rotary valve, and vacuum airtightness is maintained, and oil is not drawn into the chamber, which is hygienic.
[Brief description of the drawings]
1 is a side cross-sectional view. FIG. 2 is a plan view. FIG. 3 is a block diagram of the apparatus. FIG. 4 is an explanatory diagram of another embodiment.
10 ... Rotary valve 14 ... Chamber 19 ... Driving shaft 25 ... Vacuum pump 26 ... Vacuum line 27 ... Open / close valve 36 ... Container 42 ... Counting device 49 ... Preliminary signal

Claims (5)

Containers filled with objects to be packaged are successively accommodated in a number of pressure-resistant chambers that move along an endless track at equal intervals. One or a plurality of vacuum pumps and the number of chambers are connected via rotary valves. The pressure-resistant chambers that are connected by a foot circuit and move along the endless track by the rotary motion of the rotary valve are sequentially connected to a vacuum pump, and the containers are sequentially placed in a vacuum environment in the pressure-resistant chambers. In the method of sealing, the vacuum pump and the rotary valve are connected with a preliminary signal generated by the counting device when the number of movements of the pressure chamber matches the set numerical value input to the controller by the input device. closed-off valve provided in the line, a predetermined time after the preliminary signal originating with a rotary maintaining means, the rotation of the breakdown voltage Chiyanba After sucking air lifting to each breakdown voltage Chiyanba, said rotation maintenance means then with the secondary signal originates, storage method of the rotary valve lubricated surfaces for stopping the movement of the respective chambers and the rotary valve. The method for preserving a rotary valve lubricated surface according to claim 1, wherein, simultaneously with closing of the on-off valve, the space between the on-off valve and the rotary valve is opened to the atmosphere through the atmospheric pressure suction line of the on-off valve. A number of pressure-resistant chambers that move and rotate at equal intervals along an endless track and one or a plurality of vacuum pumps are sequentially connected via a rotary valve, and packaged in a vacuum environment in each pressure-resistant chamber. A device that sequentially seals containers that contain objects, and checks the number of movements of each open pressure chamber and a normally open type electromagnetic on-off valve installed in a line connecting the vacuum pump and the rotary valve. and a counting device further comprises means for closing the on-off valve with a preliminary signal transmitted along with the counting up of the count unit, all via the rotary valve during a certain time after the preliminary signaling the breakdown voltage Chiyanba was opened to the atmospheric pressure area, the respective chambers and Rotariba the secondary signal transmitted by the relay action from the preliminary signal Storage device of the rotary valve lubricating surface having provided with means for stopping the rotational movement of the probe. The rotary valve lubricating surface preserving device according to claim 3, wherein the counting device is restarted in response to an operation of the number input means for setting the number of movements of the pressure-resistant chamber to a target value. The rotary valve lubricating surface preserving device according to claim 3 or 4, wherein the on-off valve closed with a preliminary signal includes a line in the closed position for opening between the on-off valve and the rotary valve to the atmosphere.

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