JP2000198539A - Pneumatic feeder for hotmelt adhesive pellet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure out hotmelt pellets liable to cake and feed them pneumatically with reliability. SOLUTION: A hopper has at the bottom a suction chamber 20 in which a suction opening 28 of an ejector 24 is inserted. An inclined wall of the suction chamber 20 in opposition to the suction opening 28 is formed out of a rubber diaphragm 50 to which a vibrator 22 gives vibration. The diaphragm 50 is mounted with agitating rods 66 passed through a discharge opening 46 of the hopper to rake up hotmelt pellets in the hopper as the diaphragm 50 is vibrated. The pellets let fall into the suction chamber 20 are fed into the suction opening 28 of the ejector 24 by the diaphragm 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of transporting pellets, beads or chips (collectively referred to as pellets) of a hot-melt adhesive which is called "hot melt" in the box making industry and the packaging industry by pneumatic force. To a pneumatic conveying device for carrying out.

[0002]

2. Description of the Related Art In the box making industry and the packaging industry, a hot-melt adhesive called "hot melt" is used in a line for forming and assembling a box made of carton (so-called corrugated cardboard). As shown in FIG. 1, as the carton without or with the product is conveyed on the conveyor, the carton is sequentially bent and the carton is bent by applying a molten hot melt to the joint. Is glued. The hot melt is applied by a hot melt coating device arranged along a conveyor, and the hot melt coating device is a melting tank 1 for heating and melting the hot melt.
And a pump 2 for pressurizing the molten hot melt
And a nozzle device 3 for injecting pressurized molten hot melt. Hot melt 150 in melting tank 1
Heated to a temperature of 200 ° C. to 200 ° C. and melted, and the melted hot melt is applied from a nozzle device 3 to a joint of a carton,
Upon cooling and solidification, the carton is permanently bonded.

[0003] As the hot melt in the melting tank 1 is consumed, the hot melt must be supplied to the melting tank 1. Conventionally, hot melt is supplied to the melting tank in the form of pellets, and for this reason, a pneumatic conveying device is used. As shown in FIG. 2, the prior art pneumatic conveying device has a container 5 storing hot melt in the form of pellets 4, in which an ejector 6 and a vibrator 7 operated by compressed air are arranged. It is. When the sensor 8 of the melting tank 1 detects shortage of hot melt, compressed air is sent from the air compressor to the ejector 6 and the vibrator 7. The pellets 4 in the container 5 are loosened by the vibration of the vibrator 7, sucked into the ejector 6 and sent to the transport pipe 9. The pellets having passed through the conveying pipe 9 are separated from the air by a separator, and only the pellets are sent to the melting tank 1.

[0004]

As is well known, a hot melt made of a hot-melt adhesive exhibits some caking properties even at room temperature. For this reason, during storage in the container 5, the pellets of the hot melt may stick together to form a lump or form a bridge in the container. In particular, when a large amount of pellets are put in the container 5, the pellets are liable to be caking due to their own weight to form a lump. Also, if the pellets are left in the container 5 for a certain period of time (for example, overnight), the pellets are likely to solidify. If the pellets adhere to each other in the container to form a nodule or form a bridge in the container, it becomes impossible for the ejector 6 to inhale the pellets, which hinders replenishment to the melting tank. Occurs. Conventionally, in such a case, a stick is inserted into the container, and the baby boomer or the bridge is manually broken. This has been an obstacle to automation of the hot melt coating device. In addition, if it is not noticed that the replenishment of pellets is stopped due to the formation of a baby boomer or a bridge, the hot melt is exhausted and the box making / packaging line must be stopped.

An object of the present invention is to provide a pneumatic conveying apparatus capable of solving the inconvenience of the prior art and conveying a hot melt pellet smoothly and reliably. Another object of the present invention is to provide a pneumatic conveying device capable of reliably cutting out and sending out pellets even when hot melt pellets are mutually bonded in a hopper to form a nodule or a bridge. It is in.

[0006]

SUMMARY OF THE INVENTION In one aspect of the present invention, the present invention provides a pneumatic conveying device for conveying a pellet of a hot-melt adhesive by pneumatic force. Are a hopper for containing the adhesive pellets, a suction chamber disposed below the hopper and connected to the hopper in a vibration transmitting relationship, and an ejector for sucking and conveying the pellets dropped from the hopper into the suction chamber. Such a pneumatic conveying means, a vibrator for vibrating the suction chamber, and a knocker for periodically applying a shock to the suction chamber or hopper, and the vibrator is arranged to face the suction port of the pneumatic conveying means. .

[0007] When the suction chamber is vibrated by the vibrator, the vibration is transmitted to the hopper and vibrates the hopper, so that the pellets stored in the hopper are loosely disintegrated by the vibration and fall into the suction chamber and the suction chamber. Even though the pellets may form a bridge in the funnel of the hopper, the impact is periodically broken by the knocker and the bridge is crushed. The vibrator also serves to feed the pellets dropped into the suction chamber toward the suction port of the pneumatic conveying means. That is, since the vibrator is arranged to face the suction port of the pneumatic conveying means, the pellets dropped into the suction chamber are sent toward the suction port of the pneumatic conveying means by vibrating force of the vibrator. Therefore, the pellets in the suction chamber are reliably sent out toward the transport pipe.

[0008] In a preferred embodiment, the vibrator further comprises means for stirring the pellets in the suction chamber near the suction port of the pneumatic conveying means such as an ejector. With this configuration, even if the pellets dropped from the hopper into the suction chamber flood the suction port of the ejector, the suction port is not clogged with the pellet, and the pellet is smoothly carried out by the ejector.

In another aspect of the present invention, a pneumatic conveying device of the present invention comprises a hopper for containing adhesive pellets, and a suction chamber disposed below the hopper and connected to the hopper in a vibration transmitting relationship. And a pneumatic conveyance means for sucking and conveying the pellets dropped from the hopper into the suction chamber, and a vibrator for vibrating the suction chamber, wherein the vibrator is a side wall of the suction chamber opposed to the suction port of the pneumatic conveyance means. This side wall of the suction chamber is provided with a stirring rod extending upward through the outlet of the hopper.

[0010] In this device, a stirring rod passing through the outlet of the hopper is attached to the side wall of the suction chamber, so that when the vibrator is operated, the stirring rod swings. Therefore,
Even if a bridge is formed in the funnel part of the hopper, the bridge is broken by the stirring rod, and the pellets in the funnel part are smoothly discharged into the suction chamber. In addition, since the vibrator is disposed on the side wall of the suction chamber opposite to the suction port of the pneumatic conveying means, the pellets dropped into the suction chamber are sent toward the suction port of the pneumatic conveying means by vibrating force of the vibrator. And is easily delivered from the suction chamber.

[0011] In a preferred embodiment, at least a part of the side wall of the suction chamber is formed of an elastic material such as rubber so that the stirring rod is vibrated with a large amplitude. Preferably, the side walls of the suction chamber have a slope of approximately 45 ° and the stir bar is arranged substantially vertically. With such a configuration, the vibrating force of the vibrator is effectively used for both the swinging of the stirring rod and the feeding of the pellets. In a preferred embodiment, there is further provided a knocker which periodically impacts the suction chamber. The knocker is particularly effective for conveying hot-melt pellets having a large adhesive property.

In still another aspect of the present invention, an adhesive pellet pneumatic conveying device of the present invention comprises a hopper having a cylindrical body and a funnel, and a funnel disposed below the funnel of the hopper. A suction chamber firmly connected to the hopper, and an air force transfer means for sucking and transferring the pellets dropped from the hopper into the suction chamber, wherein a vibrating screen is provided between the body and the funnel of the hopper. Is arranged.

In general, in a hopper, a bridge is most likely to be generated in a conical funnel having a tapered cross-sectional area. In the apparatus of the present invention, since the vibrating screen is disposed between the cylindrical body of the hopper and the funnel, the weight of the pellets stored in the cylindrical body of the hopper is temporarily reduced by the vibrating screen. Supported. Therefore, the weight of the pellets stored in the cylindrical body does not add to the pellets located in the funnel part of the hopper below the vibrating screen, and the pellets located in the funnel part of the hopper are located in the cylindrical body. Exempt from the weight of pellets to be made. Therefore, in the apparatus of the present invention, no bridge is generated in the funnel portion of the hopper. Furthermore,
Since the vibrating screen is arranged at the lower end of the cylindrical body of the hopper, even if pellet nodules are formed in the body, these nodules are crushed by the vibrating screen to form loose pellets. Pass through. Therefore, the pellets in the hopper are reliably cut out and sent out to the conveying pipe by the pneumatic conveying means.

In a preferred embodiment of the device,
The body of the hopper and the funnel are substantially vibrationally insulated from each other, the body of the hopper is supported on the ground, and the funnel of the hopper is suspended from the body via vibration-proof rubber. With such a configuration, the vibration of the vibrating screen effectively vibrates the funnel portion of the hopper, and facilitates the cutting and feeding of the pellet.

In another aspect of the present invention, a pneumatic conveying device of the present invention comprises a hopper for containing adhesive pellets, and a suction chamber disposed below the hopper and connected to the hopper in a vibration transmitting relationship. And an ejector for sucking and transporting the pellets dropped from the hopper into the suction chamber, and elastic support means for elastically supporting the ejector with respect to the suction chamber so that the ejector can vibrate with respect to the suction chamber. And a vibrator connected to the ejector in a vibration transmitting relationship.

As described above, since the vibrator is connected to the ejector in a vibration transmitting relationship and the ejector is supported via the elastic supporting means so that the ejector can vibrate with respect to the suction chamber, when the vibrator is operated, the Most of the generated vibration is directly transmitted to the ejector, and vibrates the ejector with a large amplitude. Therefore, even if the pellets dropped from the hopper into the suction chamber rush into the suction port of the ejector, the bridge formed at the suction port of the ejector is broken by the vibrating ejector, and the pellets dropped into the suction chamber are reliably ejected. Sucked into. In addition, since a part of the vibration generated by the vibrator is transmitted to the hopper via the elastic support means, no bridge is generated in the funnel portion of the hopper, and the pellets in the hopper are reliably discharged to the suction chamber. Is done.

Through all of the embodiments described above, it is preferred that the inner contour of the suction port of the ejector be substantially straight. If the suction port of the ejector is shaped like this,
When the caking property of the hot melt pellet is large or the caking property increases, it is possible to prevent the pellet from rushing into the suction port of the ejector and clogging the suction port.

The above-mentioned features and effects of the present invention, as well as other features and effects, will be further clarified as described in the following embodiments.

[0019]

3 to 5 show a first embodiment of a hot melt pellet pneumatic conveying apparatus according to the present invention.
Referring to these drawings, the pellet conveying device 10 includes a hopper 16 having a cylindrical body 12 and a conical funnel 14, and the hopper 16 is attached to the body 12 by welding or the like, for example, four legs. It is supported at a predetermined height from the ground by 18. The hopper 16 can be made of a stainless steel plate, and the legs 18 can be made of a pipe or an angle material having an arbitrary cross section. The legs 18 are arranged at equal angular intervals around the body 12.

A suction chamber 20 made of a stainless steel plate is firmly attached to the lower end of the hopper by welding or the like. The suction chamber 20 has a substantially vertical side wall 20A (see FIG. 5), an inclined side wall 20B (see FIG. 5) opposed thereto, and mutually opposed substantially vertical side walls 20C and 20D (see FIG. 3) which are orthogonal to these. ) And a substantially horizontal bottom wall 20E (see FIG. 5). The inclined side wall 20B has an inclination of, for example, 30 ° with respect to a vertical line.

A vibrator 22 is attached to a side wall 20A of the suction chamber 20. The vibrator 22 and the hopper 16 are vibrated so that the hot melt
The pellets are dropped into the suction chamber 20.
As the vibrator 22, it is preferable to use a compressed air driven vibrator (for example, a piston type vibrator NTK15 manufactured by Netter Co., Germany), but an electric type, an electromagnetic type, or any other type of vibrator may be used.

An ejector 24 acting as pneumatic conveying means is mounted on the inclined side wall 20B opposite to the vertical side wall 20A on which the vibrator 22 is mounted. 26. Referring to FIG. 4, the ejector 24 has a venturi passage 32 connecting the suction port 28 and the air outlet 30. The ejector 24 has a compressed air inlet 34
The compressed air inlet 34 is connected to a compressed air source (not shown) such as an air compressor by a hose. Ejector 24
A plurality of compressed air injection nozzles 38 arranged at equal angular intervals in the circumferential direction open from the compressed air filling chamber 36 to the venturi passage 32. These compressed air injection nozzles 3
8 is inclined backward toward the axis of the ejector 24. Therefore, when compressed air is injected from the compressed air injection nozzle 38 into the venturi passage 32, a negative pressure is generated in the suction port 28, and the air is sucked from the suction port 28. The sucked air is sent out from the outlet 30 together with the compressed air.

As shown in FIG. 5, the ejector 24 is mounted on the side wall 20B of the suction chamber 20 by press-fitting the head of the ejector 24 into a circular opening 40 formed in the inclined side wall 20B of the suction chamber 20. As shown in FIGS. 3 and 5, one end of the transport pipe 26 is connected to the outlet 30 of the ejector 24, and the other end of the transport pipe 26 is connected to a melting tank (not shown) of the hot melt coating device. It has been extended.

Still referring to FIG. 3, on the other side wall of the suction chamber 20 (for example, the vertical side wall 20D), a knocker 42 of a compressed air drive type (for example, an interval knocker "PKL150 / 4ST" manufactured by Netter) is provided. It is attached. Knocker 4
2 has a built-in hammer (not shown),
0 is periodically impacted. In the illustrated embodiment, the knocker 42 is attached to the suction chamber 20, but may be attached to the hopper 16. A valve 43 for controlling the secondary air introduced into the suction chamber 20 is provided on the vertical side wall 20 </ b> C opposite to the suction chamber 20.

In operation, the ejector 24, vibrator 22, and knocker 42 are connected to a source of compressed air. A predetermined amount of hot melt pellets 44 is charged into the hopper 16, and the ejector 24, the vibrator 22, and the knocker 4 are charged.
2 is operated, the vibrator 22 vibrates the suction chamber 20 and the vibration is transmitted through the suction chamber 20 to the hopper 1.
It is conveyed to 6. The knocker 42 also periodically hits the suction chamber 20, which is also transmitted to the hopper 16.
The pellets 44 stored in the hopper 16 fall into the suction chamber 20 through the outlet 46 of the hopper 16 by vibration and impact as shown in FIG. Even if the pellets attempt to form a bridge near the discharge port 46 of the funnel portion 14 of the hopper 16, the bridge is broken by the impact periodically applied from the knocker and the vibration of the vibrator 22.

As can be clearly understood from FIG. 5, the vibrator 22 has a side wall 2 facing the suction port 28 of the ejector 24.
0A, the vibrator 22 transmits the vibration in the direction of the arrow 48 to the side wall 20A, so that the pellet 44 that has fallen into the suction chamber 20 is kicked out in the direction of the arrow F toward the suction port 28 of the ejector 24. . as a result,
Combined with the suction action of the ejector 24, the pellets 44 ride on the airflow sucked from the suction port 28 of the ejector 24, are sent out to the transport pipe 26, and are transported to the melting tank of the hot melt coating device. As described above, not only the suction action by the ejector 24 but also the kicking action or the feeding action by the vibrator 22 acts on the pellet 44 that has fallen into the suction chamber 20, so that the pellet 44 is reliably sucked by the ejector 24.

FIGS. 6 and 7 show a second embodiment of the pellet conveying apparatus of the present invention. In these drawings, components common to those of the first embodiment are denoted by the same reference numerals, and duplicate description will be omitted. To explain only the differences,
In this embodiment, the suction chamber 2 for installing the vibrator 22
The side wall 0 is formed of a substantially circular diaphragm 50 made of a flexible material such as rubber. The suction chamber 20 has an annular flange 52, the diaphragm 50 is sandwiched between the flange 52 and the retaining ring 54, and the retaining ring 54 is
Of the rubber diaphragm 50
Is fixed to the suction chamber 20. Flange 52 of suction chamber 20
Is configured such that the diaphragm 50 constituting the side wall of the suction chamber 20 is inclined at an angle of approximately 45 ° with respect to the horizontal.

The vibrator 22 is attached to the rubber diaphragm 50. For this reason, a pair of metal holding plates 58 and 60 are arranged on both sides of the diaphragm 50, and the vibrator 2
The holding plates 58 and 60 are fastened to each other by a pair of nuts 64 screwed to the second output shaft 62. A plurality of stirring rods 66 are fixed to the inner pressing plate 60 by welding or the like. These stirring rods 66 extend substantially vertically through the outlet 46 of the funnel 14 of the hopper 16.

In the second embodiment, when the vibrator 22 is operated, the vibrating plate 50 and the pressing plate 60 vibrate, and the stirring rod 66 integrated with the pressing plate 60 swings or swings. Therefore, the funnel portion 14 of the hopper
Stirring rod 6 that swings even if a bridge of pellets is formed
6 breaks the bridge, and the pellets are stably cut into the suction chamber 20 by the scraping effect of the stirring rod 66. Since the vibrator 22 and the diaphragm 50 are arranged opposite to the suction port of the ejector 24, the pellets dropped into the suction chamber 20 are moved toward the ejector 24 by the kicking action of the diaphragm 50 as in the first embodiment. Sent in.
Since the side wall of the suction chamber 20 facing the ejector 24 is formed by the rubber diaphragm 50, an effective feeding action is exhibited. Since the vibration plate 50 is inclined at approximately 45 ° and the stirring bar 66 is disposed substantially vertically, the exciting force of the vibrator 22 along the arrow 68 is reduced by the stirring bar 66.
It is effectively used for both rocking and feeding of pellets.

FIGS. 8 and 9 show a third embodiment of the pellet conveying apparatus according to the present invention. In these drawings, components common to the components of the above-described embodiment are denoted by the same reference numerals, and only the differences will be described. In the third embodiment, the cylindrical body portion 12 and the conical funnel portion 14 of the hopper 16 are formed as separate parts, and a vibrating screen device is disposed between the two.

More specifically, in the third embodiment, the body 12 of the hopper 16 has four legs 1 like the first embodiment.
8 supports against the ground. But leg 1
In order to avoid interference with the flanges of the body 12 and the funnel 14, which will be described later, legs 18
Is welded, and each leg 18 is welded to the outside of the pipe 70 in the radial direction.

The funnel 14 of the hopper 16 is suspended from the body 12 in a substantially vibration-insulating relationship via, for example, eight vibration-isolating suspension structures 80 arranged at equal angular intervals in the circumferential direction. A vibrating screen device 72 is disposed between the body 14 and the body 12. For this purpose, an annular horizontal flange 74 is provided below the cylindrical body 12 of the hopper 16, and a flange 7 of the body 12 is provided at the top of the funnel 14.
A corresponding annular flange 76 is provided. Funnel part 1
A cylindrical peripheral wall 78 extends upward from the outer end of the fourth flange 76 and surrounds the vibration-proof suspension structure 80.

Each anti-vibration suspension structure 80 has an anti-vibration mount 82 supported on a flange 74 of the body 12, and a bolt 84 passes through the anti-vibration mount 82. Body 1
At the lower part of the neck of the bolt 84 protruding downward from the second flange 74, the vibration isolating rubber 86, the circular frame 88 of the vibrating screen, the vibration isolating rubber 90, and the flange 7 of the funnel 14 are provided.
6 are inserted in this order, and these parts are fastened to each other by screwing a nut 92 to the lower end of the bolt 84. Vibrating screen 9 of vibrating screen device 72
4 can be configured by joining a wire mesh 96 to the circular frame 88 by welding or the like. The output shaft 62 of the vibrator 22 penetrates the peripheral wall 78 of the funnel 14. The output shaft 62 of the vibrator 22 is connected to the frame 88 of the vibrating screen 94,
Is activated, the vibrating screen 94 changes to the arrow 100 in FIG.
It vibrates as shown by. Hopper 1
6, to prevent the hot melt pellets charged in the body 12 from leaking from between the body 12 and the funnel 14.
The extension 98 at the lower end of the body 12 extends to the vicinity of the vibrating screen 94.

To explain the operation of this embodiment, when hot melt pellets are loaded into the body 12 of the hopper 16, the weight of the pellets located above the vibrating screen 94 is once supported by the vibrating screen 94. Is done. As a result, the weight of the pellets deposited above the vibrating screen 94 is not added to the pellets located in the funnel portion 14 or is less likely to be added to the pellets. Exempt from the weight of the pellets deposited in the section 12. As described above, since the load on the funnel 14 is reduced by the presence of the vibrating screen 94, even if the funnel 14 is filled with the pellets when the apparatus is not operated, the funnel 14 may be used.
There is no danger of the pellets located inside being strongly caking.

When the ejector 24 and the vibrator 22 are operated, the vibrating screen 94 vibrates as shown by an arrow 100 in FIG. Also, as described above, the hopper 1
Since the funnel 14 of No. 6 is suspended from the body 12 via the vibration isolating mount 82, when the vibrator 22 is operated, the funnel 14 also vibrates at the same time.

With the vibration of the vibrating screen 94, the hot melt pellets in the body 12 of the hopper 16 are scraped off by the vibrating screen 94, and
4 and then further into the suction chamber 20. The funnel section 14 of the hopper 16 is exclusively
Only the function of collecting and sending the loose pellets passing through the suction chamber 20 to the suction chamber 20 does not occur, so that there is no possibility that the pellet bridges in the funnel portion 14. The funnel 14 vibrates due to the vibration isolating mount 82, and the suction chamber 20 is also vibrated with the vibration, so that the pellets dropped into the suction chamber 20 are similar to the first and second embodiments. It is kicked out by the side wall of the oscillating suction chamber 20 toward the suction port 28 of the ejector 24, effectively sucked by the ejector 24, and sent out to the transport pipe 26. At the end of use of the device, the vibrator 22 is first stopped and the vibrating screen 94 is stopped.
Is stopped, and all the pellets in the funnel section 14 are removed from the suction chamber 2
It is preferable to stop the ejector 24 after the funnel portion 14 has been emptied and discharged to zero.

FIGS. 10 and 11 show variants of the embodiment shown in FIGS. In FIGS. 10 and 11, the same components as those of the embodiment shown in FIGS. 3 to 5 are denoted by the same reference numerals, and duplicate description will be omitted. FIG. 10 shows a variation of the ejector 24 shown in FIG. 4. Only the differences will be described. In the ejector 24 of FIG. 4, the suction port 28 is formed in a trumpet shape. In the ten ejectors 24A, the inner contour 28A of the suction port 28 is formed substantially straight or in a trumpet shape with a small curvature.

In the ejector 24 shown in FIG.
Since the suction port 28 is formed in a truncated horn shape so as to converge air, the hot melt pellets dropped from the hopper 16 into the suction chamber 20 rush into the horn portion of the suction port 28 of the ejector 24. However, if the inner contour 28A of the suction port 28 of the ejector 24A is formed substantially straight as shown in FIG. 10, the hot melt pellets dropped into the suction chamber 20 may be ejected by the ejector 24A. Can be prevented from rushing to the suction port 28, and the suction port can be prevented from clogging with pellets. Therefore, the ejector 24A shown in FIG.
It is suitable for use when the hot melt pellets have high caking properties or under conditions where caking properties increase.

Referring to FIG. 11, the pellet conveying device 1
0, the inclined side wall 20 of the suction chamber 20
An ejector 24A having a straight suction port 28A shown in FIG. 10 is attached to B. Further, in this variation, a plate 102 made of an elastic material such as rubber is attached to the side wall 20A of the suction chamber 20, and the vibrator 22 is attached so as to vibrate the rubber plate 102. A stirring rod 104 is attached to the rubber plate 102 as means for stirring the pellets in the suction chamber 20. The tip of the stirring rod 104 extends to the vicinity of the suction port 28 of the ejector 24A.

Therefore, when the vibrator 22 is operated, the rubber plate 102
At the same time as the rubber plate 102 vibrates, the tip of the stirring rod 104 swings as indicated by an arrow 106 in FIG. 11 and enters the suction chamber 20 near the suction port 28 of the ejector 24A. Gives agitating action or agitation to the pellets present As a result, the bridge formed by the rush of the pellets to the suction port 28 of the ejector 24A is reliably broken. Thus, in the variant shown in FIGS. 10 and 11, the straight suction port 28
Along with the adoption of the ejector 24A having A, the pellets can be smoothly conveyed by air even under the condition that the caking property of the hot melt pellets increases.

FIGS. 12 and 13 show variations of the embodiment shown in FIGS. In these figures, the same components as those of the above-described embodiment are denoted by the same reference numerals, and duplicate description will be omitted. Only the differences will be described. In this variant, the ejector in FIG.
An ejector 24A having a straight suction port 28A shown in FIG. Further, the knocker 42 of the compressed air drive type described above with reference to the embodiment of FIG. 3 is attached to the side wall of the suction chamber 20, and in addition to the vibration by the vibrator 22, the impact by the hammer is periodically applied to the suction chamber 20. To give.

As described above, in the variation shown in FIGS. 12 and 13, the ejector 24A having the straight suction port 28A is employed and the knocker 42 is added, so that the hot melt pellets are provided at the suction port of the ejector. The pellets can be reliably transported even under conditions in which the particles are easily clogged. In addition, in the variation shown in FIGS. 12 and 13, similarly to the stirring rod 104 shown in FIG. 11, a stirring rod extending to the vicinity of the suction port 28 of the ejector 24A is further provided, and the vibrator 22 or the knocker 42 is provided.
It is more effective to vibrate the pellet in the vicinity of the suction port 28 directly or indirectly from the nozzle.

FIGS. 14 and 15 show a fourth embodiment of the present invention. Also in these figures, the same components as those of the above-described embodiment are denoted by the same reference numerals, and duplicate description will be omitted. To explain only the differences, in the fourth embodiment, the ejector 24A is supported by the suction chamber 20 via a rubber plate 110 acting as an elastic support means. The ejector may have the horn-shaped suction port shown in FIG. 4, but the ejector preferably has the straight suction port shown in FIG. 10 for the reasons described above.

A shoulder 112 is provided on the outer periphery of the ejector 24A.
A screw portion 114 having a smaller diameter than that of the ejector 24 is formed by clamping the rubber plate 110 between the shoulder portion 112 and a nut 116 screwed to the screw portion 114.
A is attached to the rubber plate 110. The vibrator 22 is fixed to the ejector 24A by a metal belt 118 or the like, and the vibration generated in the vibrator 22 is directly transmitted to the ejector 24A. Rubber plate 110 to which ejector 24A is attached
Is fixed to a flange 126 of the suction chamber 20 by a plurality of bolts 122 and nuts 124 via a metal ring 120.

In this embodiment, the vibrator 22 is connected to the ejector 24A and the vibrator 2
When the vibrator 22 is actuated, the generated vibration firstly vibrates, since the ejector 24A equipped with 2 is elastically supported by the suction chamber 20 via the rubber plate 110.
Directly transmitted to the ejector 24A, the ejector 24A
Is vibrated with a large amplitude. Due to this vibration, a bridge that can be formed at the suction port of the ejector 24A is broken,
The pellets dropped into the suction chamber 20 are surely ejected by the ejector 2.
It is sucked in 4A. In addition, since a part of the vibration generated by the vibrator 22 is further transmitted to the hopper 14 through the rubber plate 110 and the suction chamber 20, no bridge is formed in the funnel portion of the hopper 14, and the inside of the hopper The pellets are smoothly discharged into the suction chamber 20.

FIG. 16 shows a variation of the fourth embodiment shown in FIGS. The same components as those shown in FIGS. 14 and 15 are denoted by the same reference numerals, and only the differences will be described. Referring to FIG. 16, in this variation, the ejector 24A and the vibrator 22 are fixed to a common mounting plate 128 formed of a stainless steel plate or the like. More specifically, the ejector 24A has its screw portion 11
The mounting plate 128 is mounted on the mounting plate 128 by sandwiching the mounting plate 128 between the nut 116 and the shoulder 112 that are screwed into the mounting plate 4. The vibrator 22 attaches its output shaft 130 to the mounting plate 12.
8 and fixed to the mounting plate 128 by screwing the nut 132 to the screw of the output shaft 130.

The mounting plate 128 to which the ejector 24A and the vibrator 22 are fixed as described above has a plurality of bolts 136 and nuts 138 with a pair of annular vibration-isolating rubbers 134 disposed on both sides of a flange 126 of the suction chamber 20. To the flange 126.

In the embodiment shown in FIG.
Is the flange 126 of the suction chamber 20 via the vibration isolating rubber 134
The mounting plate 128 can vibrate with respect to the flange 126 of the suction chamber 20. Therefore,
When the vibrator 22 is operated, the ejector 24A vibrates together with the mounting plate 128, and breaks the bridge formed at the suction port of the ejector 24A. As in the embodiment shown in FIGS. 14 and 15, a part of the vibration generated in the vibrator 22 is
4 to promote smooth discharge of the pellets from the hopper 14.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications and changes can be made. For example, although not shown in the drawings, the ejector 24 of the embodiment shown in FIG. 8 can be replaced with an ejector 24A shown in FIG.

[0050]

The effects of the present invention have been described in detail above. In short, hot-melt pellets are liable to caking and form aggregates or easily form bridges in containers and hoppers.However, according to the present invention, hot-melt pellets can be reliably cut out and transported. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a conventional box making and packaging line.

FIG. 2 is a schematic view of a conventional hot melt transport device.

3A and 3B show a first embodiment of the hot melt conveying device of the present invention, wherein FIG. 3A is a front view and FIG. 3B is a right side view.

4 shows the ejector of the device shown in FIG. 3, wherein the upper half is a front view and the lower half is a sectional view.

FIG. 5 is an enlarged sectional view of a part of the device shown in FIG. 3;

FIG. 6 is a front view of a second embodiment of the present invention.

FIG. 7 is an enlarged sectional view showing a part of the device shown in FIG. 6 exploded.

FIG. 8 is a front view of a third embodiment of the present invention.

9 is an enlarged sectional view of a part of the device shown in FIG.

FIG. 10 is a view similar to FIG. 4, showing a variant of the ejector;

FIG. 11 is a view similar to FIG. 5, showing a variant of the first embodiment.

FIG. 12 is a view similar to FIG. 6, showing a variant of the second embodiment.

FIG. 13 is a view similar to FIG. 7, showing a variant of the second embodiment.

FIG. 14 is a view similar to FIG. 5, with a part of a fourth embodiment of the invention cut away.

FIG. 15 is an enlarged sectional view showing a part of the device shown in FIG. 14 exploded.

FIG. 16 is a view similar to FIG. 14, showing a variant of the embodiment shown in FIG. 14;

[Explanation of symbols]

 10: Pneumatic conveying device 12: Body portion of hopper 14: Funnel portion of hopper 16: Hopper 20: Suction chamber 22: Vibrator 24: Pneumatic conveying means (ejector) 28: Suction port of ejector 42: Knocker 104: Pellet stirring Means 110, 134: elastic support means

Claims (10)

[Claims] 1. A pneumatic conveying device for conveying a pellet of hot-melt adhesive by pneumatic force, comprising: a hopper for accommodating an adhesive pellet; and a vibration transmission to the hopper disposed below the hopper. A suction chamber connected in a relationship, a pneumatic conveying means for sucking and conveying the pellets dropped from the hopper into the suction chamber, a vibrator for vibrating the suction chamber, and a periodic impact on the suction chamber or the hopper. A vibrator disposed opposite to a suction port of the pneumatic conveying means. 2. The pneumatic conveying device according to claim 1, wherein said vibrator further comprises means for stirring the pellets in the suction chamber near a suction port of said pneumatic conveying means. 3. A pneumatic conveying apparatus for conveying pellets of a hot-melt adhesive by pneumatic force, comprising: a hopper for accommodating the adhesive pellets; and a vibration transmission to the hopper disposed below the hopper. A suction chamber connected in a relationship, a pneumatic conveying means for sucking and conveying the pellets dropped from the hopper into the suction chamber, and a vibrator for vibrating the suction chamber, wherein the vibrator is a pneumatic conveying means. A pneumatic conveyance device, which is mounted on a side wall of the suction chamber facing a suction port, and a stirring rod extending upward through a discharge port of a hopper is attached to the side wall of the suction chamber. 4. The pneumatic conveying device according to claim 3, wherein at least a part of the side wall of the suction chamber is formed of an elastic material. 5. The pneumatic conveying device according to claim 3, wherein the side wall of the suction chamber has a slope of approximately 45 °, and the stirring bar is substantially vertical. 6. The apparatus according to claim 3, further comprising a knocker for periodically applying an impact to said suction chamber.
Pneumatic conveying device based on any of the following. 7. A pneumatic transport device for pneumatically transporting pellets of hot-melt adhesive, comprising: a hopper having a cylindrical body and a funnel for containing adhesive pellets; A suction chamber disposed below the funnel portion of the hopper and firmly connected to the funnel portion; and a pneumatic conveying means for sucking and conveying the pellets dropped from the hopper into the suction chamber, wherein the body portion of the hopper is provided. A vibratory screen is disposed between the funnel and the funnel. 8. The body of the hopper and the funnel are substantially vibration-insulated from each other, the body of the hopper is supported on the ground, and the funnel of the hopper is separated from the body by vibration-proof rubber. The pneumatic conveying device according to claim 7, which is suspended. 9. The pneumatic conveying device according to claim 1, wherein the pneumatic conveying means comprises an ejector, and an inner contour of a suction port of the ejector is substantially straight. 10. A pneumatic conveying apparatus for conveying pellets of a hot-melt adhesive by pneumatic force: a hopper for accommodating the adhesive pellets, and a vibration transmission to the hopper disposed below the hopper. A suction chamber connected in relation to the suction chamber; an ejector for sucking and transporting the pellets dropped from the hopper into the suction chamber; and an ejector elastic with respect to the suction chamber so that the ejector can vibrate with respect to the suction chamber. An aerodynamic conveying device comprising: an elastic supporting means for supporting; and a vibrator connected to the ejector in a vibration transmitting relationship.