JP2019131307A - Air-suction type conveyance device - Google Patents

Abstract

To provide an air-suction type conveyance device capable of easily adjusting an intake amount of secondary air, which foreign matter hardly enters from outside.SOLUTION: The air-suction type conveyance device comprises: a conveyance pipeline through which granules pass; and a granule introduction part connected to an upstream side of the conveyance pipeline. The granule introduction part is provided with a connecting pipe, an inlet cylinder, and an outer cylinder. As to the connecting pipe, its upstream side end portion is directed upward, and its downstream side end portion is connected to the conveyance pipeline. The inlet cylinder formed of a net material is connected to an upstream side of the connecting pipe. The outer cylinder whose inner peripheral surface comes in slide contact with an outer peripheral surface of the inlet cylinder is slidable in a vertical direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an air suction type conveying apparatus that conveys particles in an air flow.

  As an apparatus for conveying grains such as rice, there is an air suction type conveying apparatus. This has a conveyance pipeline, and by sucking the air in the pipeline from the downstream side, an air flow from upstream to downstream is formed, and the particles are carried on this air flow. It is. At this time, if the air is simply sucked, the air in the pipe line (primary air) is reduced and an air flow cannot be formed. Therefore, the air in the pipe line is sucked and air is introduced into the pipe line from the outside. (Secondary air) needs to be taken in. At this time, if the amount of secondary air is too small, there is a risk of clogging in the middle of the conveyance pipeline.If the amount of secondary air is too large, the particles cannot be sufficiently decelerated at the end of conveyance, and cracking occurs. May cause damage. Therefore, it is important to adjust the intake amount of secondary air to an appropriate value.

  Conventionally, a structure for taking in secondary air in such an air suction type conveying apparatus is as shown in Patent Document 1. In other words, the start end of the transfer pipe is an open air communication port that opens upward, and the supply port of the conveyed product is opposed to the open air communication port spaced upward, and the open air communication port is The diameter was larger than the supply port, and secondary air was taken in from the gap between the two.

JP 2006-205095 A

  However, the invention of Patent Document 1 does not have a structure capable of adjusting the intake amount of secondary air, that is, adjusting the interval between the outside air communication port and the supply port, and may determine an optimum interval at the design stage. Have difficulty. Further, in recent years, awareness of the problem of foreign matter mixing into a conveyed product has increased, and a structure having a wide opening as in the invention of Patent Document 1 is not preferable because of the possibility of foreign matter mixing.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an air suction type conveyance device that can easily adjust the amount of secondary air taken in and that is unlikely to contain foreign matter from the outside. .

  The invention according to claim 1 of the present invention includes a conveyance pipe line through which particles pass, and a particle introduction part connected to the upstream side of the conveyance pipe. The particle introduction part includes a connecting pipe, an inlet, A pipe and an outer cylinder, and the connecting pipe has an upstream end facing upward, a downstream end connected to the transport pipe, and the inlet pipe is made of a net material and is connected to the connecting pipe. The outer cylinder is connected to the upstream side, and an inner peripheral surface of the outer cylinder is in sliding contact with an outer peripheral surface of the inlet cylinder, and is slidable in the vertical direction. The mesh material is a material having a plurality of meshes (hole portions) by forming a plurality of through holes at intervals over the entire surface of the plate or by knitting a wire or the like.

  The invention according to claim 2 of the present invention is characterized in that the inlet cylinder has a longer outer periphery in cross section than the transport pipe.

  The invention according to claim 3 of the present invention is characterized in that an extension tube is provided below the inlet tube, and the outer surface of the extended tube is flush with the outer peripheral surface of the inlet tube. To do.

  According to a fourth aspect of the present invention, either one of the inlet tube or the outer tube has a restricting portion that abuts the other and restricts movement of the outer tube, The outer cylinder restricts the upper end of the outer cylinder from moving upward from a predetermined position below the upper end of the inlet cylinder.

  According to a fifth aspect of the present invention, a hopper for introducing particles is provided, and the hopper is connected directly above the inlet tube.

  According to the first aspect of the present invention, the secondary air can be taken in from the inlet cylinder made of a mesh material, and the outer cylinder sliding on the outer peripheral surface of the inlet cylinder is slid to slide the inlet cylinder. By changing the exposed area of the outer peripheral surface, the amount of secondary air taken in can be easily adjusted. In addition, it is possible to reliably prevent foreign matters larger than the mesh of the inlet cylinder. Moreover, since secondary air is taken in from the whole circumference of a horizontal direction with respect to the particle | grains which pass from the top to the bottom, and it mixes uniformly, conveyance efficiency is good.

  According to the invention of claim 2 of the present invention, since the outer periphery of the cross section of the inlet cylinder is longer than that of the conveying pipe, the surface area of the inlet cylinder is the same as compared to the case of the same length (= total area of the mesh). When the same = the same amount of secondary air is taken in), the height can be lowered, and as a result, the entire granule introduction part can be reduced in size.

  According to the third aspect of the present invention, since the extending cylinder is provided below the inlet cylinder, the entire outer peripheral surface of the inlet cylinder can be obtained by sliding the outer cylinder on the extending cylinder portion. Is exposed and the amount of secondary air taken in can be maximized.

  According to the fourth aspect of the present invention, the upper end of the outer cylinder is positioned below the upper end of the inlet cylinder by the restricting portion, and the inlet cylinder is exposed at a portion between the upper end of the outer cylinder and the upper end of the inlet cylinder. A predetermined secondary air intake amount is ensured, the fully closed state is not achieved, and it is prevented that the amount of air in the conveyance pipeline is extremely short and the conveyance becomes impossible.

  According to the invention of claim 5 among the present invention, since the hopper for introducing the particles and the inlet cylinder are directly connected, secondary air is supplied from the inlet portion of the conveyance, and the conveyance efficiency is good.

The granule introduction part of 1st embodiment is shown. The adjustment of the amount of secondary air taken in by the outer cylinder is shown. (A) is a fully closed state, and (b) is a fully open state. It is a general view of an air suction type conveying apparatus. (A) shows the granule introduction part of 2nd embodiment, (b) shows the granule introduction part of 3rd embodiment.

  Hereinafter, specific contents of the air suction type conveying apparatus of the present invention will be described. Although this invention can make a various grain object become the object of conveyance, the case where the polished rice grain is made into object here is shown. As shown in FIG. 3, the first embodiment of the air suction type conveying apparatus includes a conveying line 1, a granule introduction unit 2, a hopper 7, a visual inspection tube 11, an air separation / deceleration system 12, a bug, A filter 13 and a suction device 14 are provided. A raw material tank 15 and a rice mill 16 are arranged on the upstream side of the air suction type conveying apparatus, and a rotary valve 17 and a product tank 18 are arranged on the downstream side.

  The raw material tank 15 has a cylindrical shape in the upper part and a funnel shape in the lower part and is narrowed downward. The brown rice, which is the raw material, can be put in from the top and stored. The rice milling machine 16 has a rectangular parallelepiped housing, and has a brown rice inlet on the upper surface, and the lower end of the raw material tank 15 is connected to this inlet. Therefore, brown rice is sequentially fed into the rice mill 16 from the slot, and rice milling is performed. Moreover, the rice mill 16 has the discharge port 161 in the lower part of the side surface, and the polished rice grains are sequentially discharged.

  As shown in FIG. 1, the hopper 7 has a funnel shape and is narrowed downward, and its upper portion is connected to the discharge port 161 of the rice mill 16. In order to prevent foreign matters such as insects from entering, the space between the discharge port 161 and the hopper 7 is sealed. A flange 71 is formed at the lower end of the hopper 7.

As shown in FIG. 1, the granule introduction part 2 is connected to the lower part of the hopper 7 and includes a connecting pipe 3, an inlet cylinder 4, an outer cylinder 5, and an extending cylinder 6.
The connecting pipe 3 connects an inlet cylinder 4 and a conveying pipe 1 which will be described later. The connecting pipe 3 is a circular pipe having the same diameter as the conveying pipe 1 and has an upstream end facing upward and a downstream side. The downstream end is bent in the horizontal direction. At the upstream end of the connecting pipe 3, a funnel-shaped part 31 that spreads upward is formed, and the inner diameter area of the upper end of the funnel-shaped part 31 is 1 of the inner diameter area of the conveying pipe 1. .5 to 2.0 times.
The inlet cylinder 4 is made of a cylindrical mesh material, more specifically, a so-called punching metal in which through holes are formed at equal intervals over the circumferential direction and the height direction of a cylindrical metal plate, It is connected to the upstream side of the connecting pipe 3 via a funnel-shaped portion 31 (the lower end portion of the inlet tube 4 is welded and fixed to the upper end portion of the funnel-shaped portion 31), and the upper end portion of the funnel-shaped portion 31 Therefore, the outer diameter of the cross section is longer than that of the transport pipeline 1. The height (length in the vertical direction) of the inlet cylinder 4 is lower than the outer diameter of the inlet cylinder 4. Moreover, the mesh 41 (hole part) of the mesh material which comprises the inlet pipe | tube 4 is a thing smaller than the rice grain conveyed. Further, a flange 42 is formed at the upper end portion of the inlet cylinder 4, and the flange 71 of the hopper 7 is brought into contact with the flange 42 of the inlet cylinder 4 and screwed so that the hopper 7 is directly above the inlet cylinder 4. Connected. Secondary air is taken from the inlet cylinder 4 through the mesh 41. An extension cylinder 6 is provided below the inlet cylinder 4.
The extending tube 6 is a cylindrical member that extends further downward from the portion connected to the funnel-shaped portion 31 at the lower end of the inlet tube 4, and its outer peripheral surface is the outer periphery of the inlet tube 4. It is flush with the surface. The configuration may be such that the mesh material of the inlet cylinder 4 extends downward as it is, or a member different from the mesh material of the inlet cylinder 4 (even a mesh material is a plate material without holes. May be connected). The height (length in the vertical direction) of the extension tube 6 is slightly higher than the height of the inlet tube 4.
The outer cylinder 5 has a cylindrical shape that is slightly larger than the inlet cylinder 4 and the extension cylinder 6, and the inner peripheral surface thereof is in sliding contact with the outer peripheral surfaces of the inlet cylinder 4 and the extension cylinder 6, and slides in the vertical direction. It can be freely fixed at an arbitrary vertical position by the frictional resistance between the inner peripheral surface of the outer cylinder 5 and the outer peripheral surfaces of the inlet cylinder 4 and the extension cylinder 6. Further, the height (length in the vertical direction) of the outer cylinder 5 is slightly higher than the height of the inlet cylinder 4 and is substantially the same as the height of the extension cylinder 6, and there is a hole in the side surface of the outer cylinder 5. Absent. Therefore, as shown in FIG. 2A, when the outer cylinder 5 is set to the uppermost position (position where the upper end abuts against the flange 42 of the inlet cylinder 4), the entire outer peripheral surface of the inlet cylinder 4 is covered, and the mesh 41 is fully closed, and the amount of secondary air taken in becomes zero. On the other hand, as shown in FIG. 2 (b), when the outer cylinder 5 is at the lowest position (position overlapping the extension cylinder 6), the entire outer peripheral surface of the inlet cylinder 4 is exposed and all the mesh 41 is opened. The secondary air intake amount is maximized. Then, as shown in FIG. 1, when the outer cylinder 5 is set at an intermediate position in the vertical direction, only the upper part of the outer peripheral surface of the inlet cylinder 4 above the upper end of the outer cylinder 5 is exposed, and the mesh 41 is formed at equal intervals. Therefore, the exposed area of the mesh 41 is proportional to the exposed area of the outer peripheral surface of the inlet cylinder 4, that is, the amount of secondary air taken in is proportional to the exposed area of the outer peripheral surface of the inlet cylinder 4.

  The conveyance pipe line 1 is a pipe having a circular cross section connected to a downstream end part extending horizontally of the connecting pipe 3 of the granule introduction part 2, and as shown in FIG. 3, in the vicinity of the installation surface toward the downstream side. And bent vertically upward and further bent at a position higher than the raw material tank 15 and horizontally extended. Although the conveyance pipe line 1 is made of a steel pipe, a part of the vertical portion is replaced with a transparent resin pipe, and the inspection pipe 11 is formed so that the inside of the pipe can be visually observed. Moreover, the conveyance pipe line 1 consists of a separate pipe material in a bending part and a linear part, and has provided the flange in the edge part of each pipe material and the test tube 11, and each pipe material and pipe material and the test tube 11 are provided. The joint portion is secured by screwing the flanges together. The polished rice grains pass through the pipe of the conveying pipe 1 in an air flow.

  The air separation speed reduction system 12 includes a speed reducer 121, an inlet pipe 122, an outlet pipe 123, and a branch pipe 124. The inlet pipe 122 is connected to a horizontally extending downstream end portion of the conveyance pipe line 1, extends horizontally toward the downstream side, bends, and extends downward at an angle of about 45 degrees. The speed reducer 121 has a double tube structure including an outer tube 121a and an inner tube 121b. The inner tube 121b is connected to the downstream end of the inlet tube 122, and the outer tube 121a seals the periphery thereof. And covering. The inner tube 121b is made of a mesh material, and the mesh is smaller than the rice grain being conveyed. The outlet pipe 123 is connected to the downstream end portion of the inner pipe 121b of the speed reducer 121, extends toward the downstream at an angle of about 45 degrees obliquely, and bends and extends vertically downward. The branch pipe 124 is connected to the side surface of the outer pipe 121a of the speed reducer 121, extends toward the downstream side at an angle of about 45 degrees and bends and extends vertically downward. In this air separation speed reduction system 12, air is sucked from the side of the branch pipe 124, and air in the conveying pipe 1 is sucked through the mesh of the inner pipe 121b, but the rice grains are decelerated because they do not pass through the mesh. While going from the inner pipe 121b to the outlet pipe 123.

  The bag filter 13 has an air inlet connected to the downstream end of the branch pipe 124, and separates dust (fine particles) such as rice bran from the air into the lower dust box 131. To the suction device 14. A lid that can be freely opened and closed is provided at the lower end of the dust box 131. The lid is closed during operation, so that dust can be collected, and the dust can be discharged by opening the lid appropriately when stopped.

  The suction device 14 is a blower, the suction side is connected to the air outlet of the bag filter 13 by piping, and the exhaust side is open to the atmosphere.

  The rotary valve 17 is provided with radial rotary blades in the casing, and the inlet is connected to the downstream end of the outlet pipe 123 of the air separation speed reduction system 12. The rotating blades rotate while maintaining the airtightness of the upstream side and the downstream side, and the rice grains are fed out to the outlet in a fixed amount. The product tank 18 has a cylindrical shape at the top, a funnel-like shape at the bottom and is narrowed downward, and the outlet of the rotary valve 17 is connected to the top. The rice grains fed out from the rotary valve 17 can be collected, and the lower end portion has a structure that can be freely opened and closed, so that the appropriate rice grains can be taken out.

  Next, the operation of this air suction type conveying apparatus will be described. During operation, the rice mill 16 and the rotary valve 17 are driven together with the suction device 14. By driving the rice mill 16, the brown rice stored in the raw material tank 15 is sequentially polished and discharged from the discharge port 161. The discharged rice grains further flow into the grain introduction part 2 via the hopper 7 (black arrow in FIG. 1). Then, by driving the suction device 14, the air in the conveyance pipeline 1 is sucked from the downstream side via the bag filter 13 and the air separation deceleration system 12, and an air flow from the upstream side to the downstream side is formed in the pipe. Is done. The rice grains are transported from the upstream side to the downstream side in the transport pipeline 1 on this air flow. At this time, secondary air is taken into the conveyance pipe line 1 from the inlet cylinder 4 of the granule introduction part 2 (white arrow in FIG. 1), and the intake amount is determined by sliding the outer cylinder 5 up and down. It can be adjusted by changing the exposed area of the outer peripheral surface of the tube 4. The taken-in secondary air and rice grains are uniformly mixed and flow through the transport pipe 1 (black and white arrow in FIG. 1), and further flow into the air separation deceleration system 12. In the air separation speed reduction system 12, air is sucked by the branch pipe 124 connected to the side surface of the speed reducer 121, so there is no air flow toward the downstream side of the speed reducer 121, and the rice grains are decelerated. Here, dust such as rice bran conveyed with the rice grains passes through the mesh of the inner pipe 121 b of the speed reducer 121 and is sucked into the branch pipe 124 and collected by the bag filter 13. Then, the slowed rice grains flow into the rotary valve 17 from the air separation speed reduction system 12, are fed out by a fixed amount by the rotary blades, and are stored in the product tank 18.

  According to the first embodiment of the air suction type conveying apparatus of the present invention configured as described above, the space between the discharge port 161 of the rice milling machine 16 and the hopper 7 is hermetically sealed to prevent foreign matter from entering, and the upstream of the hopper 7. A sufficient amount of secondary air cannot be taken in from the side, but instead, secondary air can be taken in from the inlet tube 4 made of a mesh material. If the amount of secondary air is too small, there is a risk of clogging in the middle of the conveyance pipeline 1, and if it is too large, the rice grains cannot sufficiently decelerate at the conveyance end and collide with the rotary valve 17 and cause damage such as cracks. However, in this first embodiment, the outer cylinder 5 slidably contacting the outer peripheral surface of the inlet cylinder 4 is slid and the outer periphery of the inlet cylinder 4 is adjusted. The amount of secondary air taken in can be easily adjusted by changing the exposed area of the surface. This adjustment can also be performed while observing the state of conveyance during operation of the apparatus. In addition, it is possible to reliably prevent foreign matters larger than the mesh 41 of the inlet cylinder 4 from being mixed. In addition, since the inlet cylinder 4 has a larger diameter than the conveying pipe 1 and the outer periphery of the cross section is longer, the surface area of the inlet cylinder 4 is the same (= the same total area of the mesh = secondary) as compared with the case of the same diameter When the air intake amount is the same), the height can be reduced, and as a result, the entire granule introduction unit 2 can be downsized. Furthermore, since the secondary air is taken in from the entire circumference in the horizontal direction to the particles passing from the top to the bottom and mixed uniformly, the conveyance efficiency is good. Further, since the extension cylinder 6 is provided below the inlet cylinder 4, the entire outer peripheral surface of the inlet cylinder 4 is exposed by sliding the outer cylinder 5 on the extension cylinder 6 portion, and the secondary cylinder Air intake can be maximized. Furthermore, if the secondary air intake location is downstream from the entrance of the conveyance, the rice grains first flow into the conveyance pipeline 1 and are divided into a heavy rice grain layer and a light air layer and mixed uniformly. However, in this first embodiment, since the hopper 7 for introducing the granule and the inlet cylinder 4 are directly connected, secondary air is supplied from the inlet of the conveyance, and the rice grains and the air are Uniform mixing and good transport efficiency.

  Next, a second embodiment of the air suction type conveyance device of the present invention will be described focusing on differences from the first embodiment. 2nd embodiment differs in the shape of the outer cylinder 5 of the granule introduction part 2 compared with 1st embodiment. As shown in FIG. 4 (a), the outer cylinder 5 of the second embodiment is a cylinder having the same diameter as that of the first embodiment, and a part of the upper end in the circumferential direction further extends upward. Thus, this portion is the restricting portion 51, and the portion where the restricting portion 51 does not exist is a cutout portion 52 that opens upward. The restricting portion 51 has a convex shape and is provided at a plurality of locations in the circumferential direction, and accordingly, the cutout portion 52 has a concave shape and is formed at a plurality of locations in the circumferential direction.

  According to the second embodiment, as shown in FIG. 4A, the outer cylinder 5 is placed at the uppermost position (the position where the upper end of the restriction part 51 abuts against the flange 42 of the inlet cylinder 4). The upper end 5a of the outer cylinder 5 is located below the flange 42 at the upper end of the inlet cylinder 4, and the upper end 5a of the outer cylinder 5 and the upper end of the inlet cylinder 4 are restricted. Since the outer peripheral surface of the inlet cylinder 4 is exposed from the notch 52 between the flanges 42 and the mesh 41 of the part is opened, the secondary air is not fully closed but a predetermined amount of secondary air is taken in. When the upstream side of the hopper 7 has a particularly high sealing performance, if the apparatus is operated while the inlet cylinder 4 is fully closed, the amount of air in the transport pipe line 1 becomes extremely short and cannot be transported, and the suction device 14 However, in the second embodiment, the inlet tube 4 is not fully closed, and therefore can be prevented. And in other points, there exists an effect similar to 1st embodiment.

  Next, a third embodiment of the air suction type conveyance device of the present invention will be described focusing on differences from the first embodiment. 3rd embodiment differs in the point which provided the control part 43 in the inlet cylinder 4 of the granule introduction part 2 compared with 1st embodiment. As shown in FIG. 4 (b), the inlet cylinder 4 of the third embodiment is a cylinder made of a net material having the same size as that of the first embodiment, and is slightly below the upper end of the outer peripheral surface. A restricting portion 43 that protrudes toward the outer peripheral side is provided at the side position. The restricting portion 43 has a substantially cylindrical shape and is provided at one place in the circumferential direction.

  According to the third embodiment, as shown in FIG. 4B, the position at which the upper end 5a of the outer cylinder 5 abuts against the restricting portion 43 is the uppermost position (the restricting portion 43 moves upward from this position). Even in this case, the upper end 5a of the outer cylinder 5 is located below the flange 42 at the upper end of the inlet cylinder 4, and the inlet from the portion between the upper end 5a of the outer cylinder 5 and the flange 42 at the upper end of the inlet cylinder 4 is provided. Since the outer peripheral surface of the cylinder 4 is exposed and the mesh 41 of the portion is opened, the fully closed state is not achieved, and a predetermined amount of secondary air is taken in. Therefore, this third embodiment also has the same effects as the second embodiment.

  In the air suction type conveying apparatus of the present invention, the appropriate amount of secondary air taken in depends on the type of conveyed item, conveying process (distance and height) and conveying efficiency. The approximate value is determined with reference to. According to the experiment, when the conveyed product is a grain such as rice or wheat, the area of secondary air intake (the area of the mesh portion of the inlet tube) is 1. The ideal adjustment range is up to twice, and if the intake area is made larger than this, the amount of secondary air taken in becomes excessive, and the conveyed product cannot be sufficiently decelerated at the conveyance end portion.

  The present invention is not limited to the above embodiment. For example, in each embodiment, the connecting pipe of the granule introduction part is not limited to the same diameter as the conveyance pipe line, and may have a larger or smaller inner diameter area than the conveyance pipe line. When the inner diameter areas of the connecting pipe and the conveying pipe line are different, it is desirable that both are connected by a funnel-shaped pipe whose inner diameter area gradually decreases or increases. Moreover, shapes other than circular cross-sections, such as a cross-sectional rectangle, may be sufficient as a conveyance pipe line, a connecting pipe, an entrance cylinder, an outer cylinder, and an extension cylinder. Moreover, you may provide the fixing member for fixing the outer cylinder which is slidable to an up-down direction to an entrance cylinder and an extension cylinder reliably. As an example of the fixing member, a member that fastens and fixes the outer cylinder from the outer peripheral side, such as a so-called hose band, can be mentioned. In addition, by providing a projecting portion that protrudes to the outer peripheral side at the lower end portion of the extended cylinder so that the lower end portion of the outer cylinder contacts the projecting portion when the outer cylinder is slid downward, the outer cylinder May be prevented from falling off the extension tube. In this case, the protruding portion may be provided at one or a plurality of locations in the circumferential direction of the extending cylinder, or may be a hook-like shape provided over the entire circumference in the circumferential direction. Moreover, in 2nd embodiment, what kind of shape of the control part provided in an outer cylinder may be sufficient, and it should just be provided in at least 1 place of the circumferential direction. Furthermore, in 3rd embodiment, what kind of shape of the control part provided in an inlet_tube | cylinder may be sufficient, the thing provided in the several places of the circumferential direction may be sufficient, and the bowl shape provided over the perimeter of the circumferential direction It may be.

DESCRIPTION OF SYMBOLS 1 Conveyance pipe line 2 Granule introduction part 3 Connection pipe 4 Inlet cylinder 5 Outer cylinder 6 Extension cylinder 7 Hopper 43 Restriction part 51 Restriction part

Claims (5)

A conveyance pipe line through which the granular material passes, and a granular material introduction section connected to the upstream side of the conveyance pipe line,
The granule introduction part includes a connecting tube, an inlet tube, and an outer tube,
The connecting pipe has an upstream end facing upward, and a downstream end connected to the transport pipeline,
The inlet cylinder is made of a mesh material and connected to the upstream side of the connecting pipe,
An air suction type conveying apparatus characterized in that the outer peripheral surface of the outer cylinder is in sliding contact with the outer peripheral surface of the inlet cylinder and is slidable in the vertical direction.   The air suction type conveying apparatus according to claim 1, wherein the inlet cylinder has a longer outer periphery in cross section than the conveying pipe line. An extending cylinder is provided below the inlet cylinder;
The air suction type transfer device according to claim 2, wherein the extended cylinder has an outer peripheral surface flush with an outer peripheral surface of the inlet cylinder. Either one of the inlet cylinder or the outer cylinder has a regulating portion that abuts the other and regulates the movement of the outer cylinder,
The said restriction | limiting part restrict | limits that the said outer cylinder moves to the upper side from the predetermined position in which the upper end is below the upper end of the said inlet cylinder, The said 1, 2 or 3 characterized by the above-mentioned. Air suction type transport device. Equipped with a hopper for introducing granules,
5. The air suction type conveying apparatus according to claim 1, wherein the hopper is connected immediately above the inlet cylinder.

Images