JPH0318422Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> This invention is a pressure-feeding method for transporting granular pellets, which are molding materials for various synthetic resin products, to the hopper of a molding machine, its cyclone, storage tank, etc. for storage. Regarding equipment.

<Prior art> In general, the surface of granular pellets, which are the main material for synthetic resin molding, are shredded by a pelletizer, and a primary layer is applied to the surface of the pellets in order to improve the fluidity and moldability within the mold during molding. Mixing machines that attach and mix lubricants, colorants, and other additives are known for processing, but in the tanks of such mixers, pellets whose colors and materials change are mixed one after another. When feeding, mixing and stirring, in order to ensure that none of the previously mixed pellets remain and that they do not have any negative effect on the next pellet, the pellets should be completely recovered from the mixing tank, and then removed from the hopper of the molding machine. It is necessary to pump it to the cyclone, storage tank, etc. for storage.

As a pressure-feeding device for this purpose, the present applicant previously proposed Utility Model Publication No. 47-36907, and has achieved a considerable amount of use, but since then, this device has improved heat resistance, wear resistance,
With the emergence of various composite resins, so-called engineering plastics, and other high-strength molded products that are highly weather resistant and reinforced with metal powder, glass fiber, etc., due to changes in the material properties of the pellets. This resulted in the following problems.

<Problems to be solved by the invention> That is, according to the configuration of the above-mentioned known invention, firstly, the air supply hole 23 formed in the pressure-feeding pipe 5 is not located on the longitudinal center line of the pressure-feeding pipe 5 itself; Since the opening is eccentric to the bottom side, the blower 4 can be used to replace other pellets or additives into the mixing tank 1, or to switch the pressure feeding route to the hopper of the molding machine, storage tank, etc. When the rotation is stopped, if the pressure feed pipe 5 or the delivery pipe 6 is clogged with pellets, the pellets are instantaneously thrown back to the rear of the blower 4 side. Since the guide plate 20 is in an inclined position at that time, the pellets also flow back into the mixing tank 1.

Second, when the blower 4 is stopped, even if the pellets do not flow backward and the pellets remain and accumulate in the pressure feed pipe 5, the guide plate 20 is 5
Since the position directly below the communicating hole 19 faces the communicating hole 19 as if it were a partition, it is possible to directly observe the residual/accumulated state of pellets in the pressure feeding pipe 5 through the communicating hole 19, which is the input side of the pellets. Therefore, it is not possible to completely eliminate this or to clean the inside of the pressure feed pipe 5 easily and smoothly.

Thirdly, the pressure feed pipe 5 itself is in the form of a simple straight pipe, and the air feed hole 23 that opens eccentrically as described above is narrowed and formed by the guide plate 20 in an inclined position inserted therein. Because the air vent 23
When the jet airflow passes through, a noise similar to whistling is generated.

Fourth, since the guide plate 20 itself is in the form of a flat plate, when pellets of the above-mentioned high hardness material repeatedly collide with the guide plate 20, holes are formed in the guide plate 20. Even if the damage does not occur, it is inevitable that it will be damaged sooner than other structural members, and it is inferior in durability.

Fifth, even if you try to repair, disassemble, or replace the guide plate 20 or pressure feed pipe 5 in such a case, the guide plate 20 is welded and integrated with the pressure feed pipe 5.
Furthermore, since the pressure feed pipe 5 itself is welded and fixed to the mixing tank 1 via a separate feed tube 18, it is impossible to repair, disassemble, or replace it, which is uneconomical for the user. There is also the problem of being forced to do so.

On the other hand, Utility Model No. 51-112886 proposed by a third party
No. 3 is also known, but in this case, the casing 3 is integrally molded as a whole by aluminum casting, which inevitably causes the problem described in point 5 above, and also prevents early damage and prevents pellets from being as far away as possible. Even if an attempt is made to apply a surface treatment such as wear resistance or a smooth mirror finish to the inner wall surface of the casing 3 in order to achieve a pumping action toward the casing 3, this cannot be done.

These problems occur not only when pellets are mixed and stirred with additives such as lubricants and colorants, but also when pellets of various materials are transferred to the hopper of a molding machine or a storage tank. Even if the data is simply sent back and forth, it can be said that the same thing happens. This is because it is still necessary to cover the pellets and prevent the pellets that were pumped last time from being mixed with different pellets from the next time.

<Means for Solving the Problems> The present invention is intended to improve these problems, and for this purpose, it is constructed such that a synthetic resin pellet input hopper or a bottom surface of a mixing tank for the pellets and various additives is provided. The midway part of the pressure feed pipe is connected to the opening of the pellet discharge hole from below, and the pellets received in a natural fall form from the discharge hole into the pressure feed pipe are forwarded by jet airflow that is forced into the pressure feed pipe from the rear. In a pressure-feeding device for synthetic resin pellets used to blow them up and collect them in a hopper, cyclone, storage tank, etc. of a molding machine, the above-mentioned pressure-feeding tube is used as a pair of a front tube and a rear tube that are split from the middle. On the longitudinal center line of the front tube, a pellet transfer path whose diameter gradually decreases toward the rear is opened, and the rear end opening of the pellet transfer path is opened with a throttle hole of a constant diameter. Similarly, a vertical flange is protruded from the rear end of the front tube, and the joint surface where the vertical flange is joined to the rear tube has a semicircular shape in plan view that communicates vertically with the aperture hole. While cutting out the concave groove, an air inlet passage whose diameter gradually decreases toward the front is opened on the longitudinal center line of the rear tube, and the front end opening of the air inlet passage is opened at the front end of the air inlet passage. The throttle hole is set as a jet air flow generation throttle hole with a diameter slightly smaller than that of the above throttle hole in the rear tube, and a vertical flange is also protruded from the front end of the rear tube, and the joint surface where the vertical flange is joined to the front tube is set. The front tube is provided with a downwardly inclined bottom surface that does not directly communicate vertically with the jet airflow generating throttle hole, and a semicircular groove in a plan view facing the groove of the front tube is cut out. The vertical flange and the vertical flange of the rear pipe are connected in a state of concentric communication with the pellet transfer path and the air inlet path, and are removably connected and integrated by bolts and nuts passing through both vertical flanges. , A circular pellet fall guide path in plan view communicating with the pellet discharge hole is defined by the two concave grooves facing each other on the joint surface of both the vertical flanges, and both apertures facing each other on the joint surface of both the vertical flanges. It is characterized in that a certain level difference is created between the holes, based on the difference in the diameter of the holes, so that the bottom surface of the pellet transfer path is lower than the bottom surface of the air feed path.

<Example> Hereinafter, the specific structure of the present invention will be described in detail based on the illustrated embodiment. FIG. 10 is a mixing tank thereof; 11 is a feeding tube for feeding into the tank 10 synthetic resin pellets as the main material for molding, which are shredded into cylindrical particles with a diameter of approximately 3 mm and a height of approximately 3 mm; 1
2 is an auto feeder that feeds various additives such as wax (lubricant), pigment (coloring agent), and metal soap (stabilizer), which are also related to auxiliary materials, and the additives and granular pellets to be injected are The mixture is mixed by a stirring blade 13 that is rotatably driven within the tank 10. The mixed pellets then overflow the partition wall 14 in the tank 10 and are discharged through the pellet discharge hole 15 opened at the bottom of the tank 10.
After that, it is received into the pressure-feeding pipe P in a natural manner.

In the present invention, the pressure-feeding pipe P consists of a pair of front pipe P1 and rear pipe P2, which are divided from the middle part, and are connected and integrated in a detachable manner as shown in Figs. ing.

That is, assuming that the pressure-feeding pipe P functions to force-feed the pellets in the direction of the arrow A shown in the figure, the front pipe P1, which is cast from stainless steel, has the following points on its longitudinal centerline:
A pellet transfer path S1 is opened through the pellets. The pellet transfer path S1 is formed in the shape of a truncated cone whose diameter gradually decreases toward the rear, and the rear end opening is connected to the pellet discharge hole 1.
Aperture hole 16 with a constant diameter d1 facing directly below 5
is set as .

17 is a vertical flange extending from the front end of the front pipe P1, and is joined to a flange 19 formed corresponding to a communication pipe 18 with a hopper of a molding machine, a cyclone, a storage tank (not shown), etc.
Moreover, they are connected and integrated by bolts and nuts 20 in a detachable manner. Similarly, 21 is a semicircular groove cut out in the rear end surface of the front pipe P1 for flange connection with the rear pipe P2 in plan view;
In particular, as is clear from FIGS. 4 and 5, at its lower end, it is in direct communication vertically with the throttle hole 16 forming the rear end of the pellet transfer path S1, thereby allowing the pellets to flow from the discharge hole 15 of the tank 10. A falling guide path G for receiving pellets reaching the pressure feeding pipe P is formed as an opening. In other words, the concave groove 21 is bottomless and has an opening in direct communication with the aperture hole 16 above and below, so that the inside of the drop guide path G can be directly inspected from above.

22 is a cowling image that gives roundness to the corner at the communication boundary position, 23 is a vertical flange that also extends from the rear end for joining of the front pipe P1,
A required number of bolt insertion holes 24 are opened in this. Reference numeral 25 is a horizontal flange bulged on the top surface of the rear end in a relationship perpendicular to the vertical flange 23, and this has a semicircular shape when viewed from above. As is clear from FIGS. 4 and 5, the vertical flange 23 and the horizontal flange 25 protruding from the rear end of the front pipe P1 are attached to the joining surface where they are joined to the rear pipe P2 in the semicircular shape in plan view. Concave groove 21
is cut out and exposed. Note that 26 is a horizontal mounting seat connected to the protruding lower end of a vertical flange, which will be described later, in the rear pipe P2, and this also has a hole 27 for inserting a bolt or the like.

On the other hand, the rear pipe P2 is also cast from stainless copper, and a truncated cone-shaped air inlet passage S2 whose diameter gradually decreases toward the front is opened on its longitudinal centerline, and The front end opening of the air feed passage S2 functions as a throttle hole 28 for generating jet airflow.

In that case, as is especially clear from Figures 6 and 7,
The diameter d2 of the throttle hole 28 in the rear pipe P2 is slightly smaller than the diameter d1 of the pellet transfer path S1 in the front pipe P1, especially the diameter d1 of the throttle hole 16. Although the pellet transfer path S1 of the front pipe P1 and the air feed path S2 of the rear pipe S2 are connected in a concentric communication state in which their longitudinal center lines match, the bottom surface of the pellet transport path S1 in the front pipe P1 and the rear A certain level difference H is provided at the boundary between the pipe P2 and the bottom surface of the air feed passage S2, which is lower (deeper) in the former pipe.

Further, 29 is a vertical flange projecting from the rear end of the rear pipe P2, which is connected to a flange 32 formed correspondingly to a communication pipe 31 connected to an air supply source 30 such as a ring blower, and is also connected to a bolt.・
They are removably connected and fixed by a nut 33. Similarly, 34 is a horizontal flange raised on the top surface of the front end, and has a semicircular shape in a plan view facing the horizontal flange 25 of the front pipe P1. 35 is also the front pipe P in the rear pipe P2
This is a semicircular groove in plan view cut out in the front end surface for flange connection with the front pipe P1, and the groove 2 of the front pipe P1.
Together with 1, a falling guide path G is defined which has a circular opening in a plan view as shown in FIG.

However, while the groove 11 of the front tube P1 is bottomless, the groove 35 of the rear tube P2 has an inclined bottom surface that slopes downward as shown in FIGS. 4 and 6. , is isolated from the air supply path S2 so that it does not communicate vertically directly, and only the concave groove 21 of the front pipe P1 communicates vertically directly with the throttle hole 16 facing the position of the step H. It is now possible to inspect the inside. Reference numeral 36 denotes an arcuate cowling surface provided on the bottom surface of the jet airflow generating throttle hole 28, which serves to cause the air to flow in a directional manner so that no pellets remain in the step H portion.

37 is a vertical flange that also extends from the joining end of the rear pipe P2, and this
A bolt insertion hole 38 that matches the bolt insertion hole 24 of the vertical flange 23 is bored. On the joint surface where the vertical flange 37 and horizontal flange 34 protruding from the front end of the rear pipe P2 are joined to the front pipe P1, the semicircular groove 35 in plan view is formed as shown in FIGS. 4 and 6. The cutout is exposed. And the vertical flange 2 of the front pipe P1
3 and the vertical flange 37 of the rear pipe P2, the required number of fastening bolts and nuts 39 are inserted between the vertical flanges 23, 37 of the front pipe P1 and the rear pipe P2. In this joined state, the pellet transfer path S1 and the air feed path S2 are connected and integrated in a coaxially communicating state.

In the joined state, the semicircular groove 2 of the front pipe P1
1 and the semicircular groove 35 of the rear pipe P2 automatically match, and a circular pellet fall guide path G in plan view communicating with the pellet discharge hole 15 is defined as shown in FIG. Also, as is clear from the same figure, the horizontal flange 25 of the front pipe P1 and the rear pipe P2
Since the horizontal flanges 34 are also aligned with each other, it can be stably and easily connected to the mixing tank 10 in FIG. 1 or the hopper in FIG. 8 from below via a mounting ring to be described later.

The front pipe P1 and the rear pipe P2 can be connected very easily and stably by the fastening bolts and nuts 39 of the vertical flanges 23 and 37 for joining them, or the bolts and nuts 39 can be easily and easily removed. Therefore, since the connection state can be disassembled, it is possible to repair or replace each of the front pipe P1 and the rear pipe P2.

In addition, the front pipe P1 and the rear pipe P2 are separate and independent in advance, and are removably connected by bolts and nuts 39 when both vertical flanges 23 and 37 are joined, so they cannot be disassembled. By doing so, the pellet transfer path S1 of the front pipe P1 is
In addition, the inner wall surfaces of the air inlet path S2 of the rear pipe P2 and the drop guide path G are subjected to surface treatment such as abrasion resistance and a smooth mirror finish by chemical or mechanical means. is also possible.

In particular, if the inner wall surface of the pressure-feeding pipe P is treated with a smooth, abrasion-resistant mirror surface, it will be possible to effectively prevent the surface from being damaged during the pressure-feeding of pellets, significantly increasing its durability. Not only can pellets be obtained, but the pellets can also be blown and pumped as far as possible.

Furthermore, 40 is a required number of bolts 41 on both the horizontal flanges 25, 34 of the front pipe P1 and the rear pipe P2.
The mounting ring is preferably detachably joined and integrated, and can be used as an accessory when the pellet falling guide path G in the pressure feed pipe P is connected to the tank 10 of the mixer. However, as shown in the modified usage example in FIG. 8, for example, the pressure feed pipe P is mounted on a hopper 42 that is separate from the mixing tank 10, so that it can be installed from the hopper 42 without being attached to the mixer. It is also possible to use the same method in which pellets of various materials are introduced one after the other and transferred to the hopper of a molding machine installed in parallel via the pressure feed pipe P, its cyclone, storage tank, etc.

In other words, the present invention can be used even when it is not mixed with additives, and according to this, the pressure feeding pipe P
It is extremely convenient in practice in that the installation position of the system can be changed freely.

<Function> According to the above configuration, the granular pellets are sequentially received into the pressure feeding pipe P from the falling guide path G, but the pellets are not supplied with air from the air supply source 30 such as a blower through the rear pipe P2. When the air fed into the air passage S2 passes through the small-diameter throttle hole 28 located at the front end of the air feeding passage S2, it is blown as a high-speed jet air stream, so that the pellets are The pellets do not remain or accumulate in the pressure feed pipe P, and are all blown away through the pellet transfer path S1 of the front pipe P1 and the communication pipe 18, and then continue to the hopper, cyclone, storage tank, etc. in the molding machine (not shown). It will be completely collected and stored.

In that case, especially the air inlet path S2 of the rear pipe P2
is a jet airflow generating aperture which has an overall truncated cone-shaped opening whose diameter gradually decreases toward the front, and whose front end opening has a diameter smaller than the aperture hole 16 of the front pipe P1. The pellet transfer path S1, which is set as the hole 28 and goes forward from the throttle hole 16 of the front pipe P1, is formed in a truncated conical shape that gradually decreases in diameter as it goes rearward. Therefore, the jet airflow from the throttle hole 28 is not disturbed, and the airflow is
The pellets can be sprayed in a concentrated burst from a point, and the pellets can be automatically and instantaneously launched.Therefore, it is possible to perform pressure feeding over a long distance as much as possible, and the pellets can be delivered near the rear end of the pellet transfer path S1. This means that pellet retention can be effectively prevented.

<Effects of the Invention> As described above, in the present invention, the pressure feeding pipe P is connected from below to the pellet discharge hole 15 opened at the bottom of the synthetic resin pellet charging hopper 42 or the mixing tank 10 for mixing the pellets and various additives. The midway portion is connected for communication, and the pellets received in a free-falling manner from the discharge hole 15 into the pressure feed pipe P are blown forward by a jet air flow that is forced into the pressure feed pipe P from the rear.
In a pumping device for synthetic resin pellets used to collect into a hopper, cyclone, storage tank, etc. of a molding machine, the above-mentioned pressure feeding pipe P is divided into a pair of front pipe P1 and rear pipe P2, which are divided from the middle part. On the longitudinal center line of the front pipe P1, a pellet transfer path S1 whose diameter gradually decreases toward the rear is opened, and the rear end opening of the pellet transfer path S1 has a constant diameter. d1 as the throttle hole 16, and a vertical flange 2 at the rear end of the front pipe P1.
3, and cut out a semicircular groove 21 in a plan view that communicates vertically directly with the throttle hole 16 in the joint surface where the vertical flange 23 is joined to the rear pipe P2. An air inlet passage S2 whose diameter gradually decreases toward the front is opened on the longitudinal center line of the front pipe P1, and the front end opening of the air inlet passage S2 is connected to the throttle hole 16 of the front pipe P1.
The rear pipe P2 has a vertical flange 3 at its front end.
7, and the vertical flange 37 of the front pipe P1 is provided with a front-sloping inclined bottom surface that does not vertically communicate directly with the jet air flow generating throttle hole 28 on the joint surface where the vertical flange 37 is joined to the front pipe P1. The vertical flange 23 of the front pipe P1 and the rear pipe P are cut out by cutting out the semicircular groove 35 facing the groove 21 in plan view.
The pellet transfer path S1 and the air feed path S2 are connected to the vertical flanges 37 of No. 2 in a concentric state of communication, and are removably connected by bolts and nuts 39 passing through both vertical flanges 23 and 37. The two concave grooves 21 and 35 facing each other on the joint surfaces of the vertical flanges 23 and 37 are integrated to define a pellet falling guide path G that is circular in plan view and communicates with the pellet discharge hole 15. Between the opposing throttle holes 16 and 28 on the joint surface of the vertical flanges 23 and 37, the bottom surface of the pellet transfer path S1 is lower than the bottom surface of the air feed path S2 based on the difference in diameters d1 and d2. Since a certain level difference H is generated,
This has the effect of improving all of the problems 1 to 5 mentioned at the beginning.

That is, according to the configuration of the present invention, the pressure feeding pipe P is formed as a pair of the front pipe P1 and the rear pipe P2, which are divided from the middle part, and the front pipe P
The vertical flange 23 extending from the rear end of the rear pipe P2 and the vertical flange 37 correspondingly extending from the front end of the rear pipe P2 are in concentric communication with the pellet transfer path S1 and the air feed path S2, and Since the connection is made in a detachable manner using bolts and nuts 39, the connection work can be performed extremely easily and stably, and once connected, the half of the front pipe P1 a circular groove 21;
A circular pellet falling guide path G communicating with the pellet discharge hole 15 opened at the bottom of the mixing tank 10 or the hopper 42 is automatically defined between the rear pipe P2 and the semicircular groove 35 facing each other. Therefore, the front pipe P1 and the rear pipe P2 can be disassembled and repaired or replaced easily.

In particular, the front pipe P1, through which the pellets are fed under pressure, has harsher operating conditions than the rear pipe P2, which is equipped with the air inlet passage S2, and its lifespan is relatively short. Pipe P1 and rear pipe P2
Being able to repair or replace each individual item has great technical significance in practice.

Further, the front pipe P1 and the rear pipe P2 are separate and independent in advance, and in the disassembled state, the grooves 21 and 35 of both that define the pellet falling guide path G are completely exposed to the outside world. Therefore, the falling guide path G, pellet transfer path S1, and air feed path S
Surface treatment such as a wear-resistant, smooth mirror finish can be applied to the inner wall surface of No. 2 without any problems.
As a result, the present invention can be used to pump various composite resins reinforced with metal powder, glass fiber, etc., engineering plastics, and other high-strength pellets without damaging the inner wall surface. Not only can the overall durability of the pressure feed pipe P be significantly improved, but also the pellets can be smoothly and reliably blown and recovered as far as possible.

In particular, this effect can be further enhanced if the structure described in Section 2 of the Utility Model Claims is adopted. These effects are due to the implementation of the conventional technology mentioned at the beginning.
From No. 36907 and Utility Model Application No. 51-112886, it cannot be sustained for a long time.

Furthermore, in the case of the present invention, the jet air flow forming the front end opening of the air supply path S2 in the rear pipe P2 is smaller than the diameter d1 of the throttle hole 16 forming the rear end opening of the pellet transfer path S1 in the front pipe P1. The diameter d2 of the generation aperture hole 28 is made very small,
When the front pipe P1 and the rear pipe P2 are concentrically connected, both vertical flanges 23, 3
A certain level difference H is created on the joint surface of No. 7 so that the bottom surface of the pellet transfer path S1 is lower than the bottom surface of the air feed path S2.

Moreover, the semicircular groove 21 of the front pipe P1 that defines the pellet falling guide path G is bottomless and in direct communication with the throttle hole 16 above and below, while the semicircular groove 21 of the rear pipe P2 opposite thereto has a bottomless shape. The circular concave groove 35 has a front-sloping inclined bottom surface, and is separated from the jet airflow generating throttle hole 28 without being in direct communication with it vertically.

Therefore, the pellets naturally fall from the falling guide path G to the rear end opening of the pellet transfer path S1 in a stable and reliable manner, and the pellets are absorbed into the jet air stream that is explosively blown from one point of the jet air flow generation throttle hole 28. As a result, pellets can be completely and efficiently pumped to long distances without leakage, and there is no risk of clogging of the pellets in the pressure feeding pipe P or generation of whistling noise.

Furthermore, even if a backflow of pellets occurs when the air supply from the air supply source 30 is stopped, the pellets are blocked by the presence of the step H, and the pellets are blocked by the air supply path S2. Therefore, it is possible to effectively prevent the possibility of the pellets being mixed with pellets of different materials or colors.

The pellet fall guide path G defined between the opposing grooves 21 of the front pipe P1 and the groove 35 of the rear pipe P2 is in vertical direct communication with the rear end opening of the pellet transfer path S1. Since the pellets are designed to naturally fall into the aperture hole 16 at the end opening, the estimated state of the pellets is determined by the falling guide path G.
Direct inspection can be performed from above, and as a result, when stopping the air supply and replacing the next pellet with a different one, it is possible to check if the previous pellet remains in the pressure feed pipe P. Even if
By knowing this for sure, you can eliminate it, and you can also clean the inside easily and smoothly.
It would also be extremely useful to be able to decompose

In particular, as mentioned at the beginning, in this type of pumping device for synthetic resin pellets, it is not allowed to mix pellets with different colors and materials, so the above effect has a great technical meaning in practice. It can be said that it has.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing the present invention in use, Fig. 2 is an enlarged side view showing the pressure feeding pipe extracted, Fig. 3 is a plan view of Fig. 2, and Fig. 4 is the third Figure 5 is an enlarged rear view of the front tube viewed from the rear, Figure 6 is an enlarged front view of the rear tube viewed from the front, and Figure 7 is taken along the line - of Figure 4. The enlarged sectional view and FIG. 8 are partially cutaway side views showing a modification example of the usage state corresponding to FIG. 1. P...Pressure pipe, P1...Front pipe, P2...Rear pipe, S1...Pellet transfer path, S2...Air feed path, G...Drop guide path, H...Step, 10...
Mixing tank, 16, 28... Throttle hole, 21, 35
... Concave groove, 30 ... Air supply source, 42 ... Hopper.

Claims (1)

[Scope of Claim for Utility Model Registration] A midway portion of the pressure feeding pipe P is connected from below to the pellet discharge hole 15 opened at the bottom of the synthetic resin pellet input hopper 42 or the mixing tank 10 for mixing the pellets and various additives. At the same time, the pellets received in a free-fall manner from the discharge hole 15 into the pressure feed pipe P are blown forward by the jet air flow forced into the pressure feed pipe P from the rear.
In a pumping device for synthetic resin pellets used to collect into a hopper, a cyclone, a storage tank, etc. of a molding machine, the above-mentioned pressure feeding pipe P is divided into a pair of front pipe P1 and rear pipe P2, which are divided from the middle part. On the longitudinal center line of the front pipe P1, a pellet transfer path P1 whose diameter gradually decreases toward the rear is opened, and the rear end opening of the pellet transfer path S1 has a constant diameter. d1 as the throttle hole 16, and a vertical flange 2 at the rear end of the front pipe P1.
3, and cut out a semicircular groove 21 in a plan view that communicates vertically directly with the throttle hole 16 in the joint surface where the vertical flange 23 is joined to the rear pipe P2. An air inlet passage S2 whose diameter gradually decreases toward the front is opened on the longitudinal center line of the front pipe P1, and the front end opening of the air inlet passage S2 is connected to the throttle hole 16 of the front pipe P1.
The rear pipe P2 has a vertical flange 3 at its front end.
7, and the vertical flange 37 of the front pipe P1 is provided with a front-sloping inclined bottom surface that does not vertically communicate directly with the jet air flow generating throttle hole 28 on the joint surface where the vertical flange 37 is joined to the front pipe P1. The vertical flange 23 of the front pipe P1 and the rear pipe P are cut out by cutting out the semicircular groove 35 facing the groove 21 in plan view.
The pellet transfer path S1 and the air feed path S2 are connected to the vertical flanges 37 of No. 2 in a concentric state of communication, and are removably connected by bolts and nuts 39 passing through both vertical flanges 23 and 37. By integrating the grooves 21 and 35 facing each other on the joint surfaces of the vertical flanges 23 and 37,
A circular pellet fall guide path G in plan view is defined which communicates with the pellet discharge hole 15, and a diameter d1 is also defined between the two throttle holes 16, 28 which face each other on the joint surface of both the vertical flanges 23, 37. . 2. Both the front pipe P1 and the rear pipe P2 are cast from stainless steel, and the pellet transfer path S1 of the front pipe P1, the air feed path S2 of the rear pipe P2, and both concave grooves 21, 3G are formed.
A request for a utility model issuance characterized in that the inner wall surface of the pellet falling guide path defined between the pellets 5 and 5 is finished with a smooth, abrasion-resistant mirror surface by chemical or mechanical surface treatment. Scope: A device for pumping synthetic resin pellets as described in item 1.