JP5719490B1 - Asphalt extraction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it difficult for a solvent to enter between a rotating shaft and a bearing of a centrifuge container, and to reduce the labor and cost of parts replacement. An inner cover serving as an inner wall member is supported by a side portion of an extract collection container 30 being spaced from an outer cover 32 by a spacer 83 inside the outer cover 32 and the outer cover 32. The opening 82 between the lower end of the inner cover 80 and the upper end of the inner cover 80 is provided so as to oppose the extraction liquid ejection direction of the centrifuge container 1, and the extraction liquid passes through the opening 82 and the inner cover 80. , 81 and the outer cover 32, and a mesh-like rectifying member 84 that suppresses the momentum of the extract is provided in the opening 82. [Selection] Figure 6

Description

  The present invention relates to an asphalt extraction apparatus, and in particular, rotates a centrifuge container containing an asphalt mixture and a solvent at a high speed, and recovers an extract solution in which asphalt components are dissolved in an extract recovery container surrounding the centrifuge container. Asphalt extraction apparatus.

  In road pavement, the asphalt content is defined by standards, and the asphalt content is inspected using a sample of asphalt mixture prepared by trial production at a plant or by sampling from a construction site. Centrifugal asphalt extraction devices are widely used to separate and collect asphalt components and aggregates from asphalt mixtures. In this apparatus, for example, as shown in Patent Document 1, a centrifuge container capable of storing an asphalt mixture and a solvent is arranged in an extraction chamber in an extract collecting container composed of a cylindrical cover and a bottom container, and a lower part of the centrifuge container is arranged. The rotating shaft connected to the center extends below the extraction chamber, and an inverter type motor is coupled to the lower end. A solvent supply nozzle connected via a solvent supply pipe and a solvent tank installed on the upper outer side of the extraction liquid recovery container is loosely inserted into the solvent introduction part provided in the central part of the centrifuge container from above the extraction chamber. is there. A ring-shaped recess centering on the rotation axis is provided on the upper surface of the extraction container side of the bottom container of the extraction liquid recovery container. A solvent / asphalt separator is connected to a solvent discharge hole opened from the recess to the lower surface of the bottom container via a solvent discharge pipe. A heater and a water cooling pipe are installed in the bottom container. The centrifuge container has a lower pan-shaped container body and an upper disk-shaped lid, and is detachably integrated with a ring-shaped filter paper between the upper surface of the edge of the container body and the lower surface of the edge of the lid. It is.

Open the cover forming the extraction chamber, connect the centrifuge container containing a predetermined amount of asphalt mixture to the rotating shaft, close the cover, and control the electromagnetic valve provided in the solvent supply pipe to control the predetermined amount from the solvent supply nozzle. The solvent is supplied into the centrifuge container, left standing for a certain period of time, soaked, and the asphalt component is eluted in the solvent. Thereafter, the motor is rotated to rotate the centrifuge container at a high speed of about 3000 rpm, and the extract solution in which the asphalt component is dissolved is ejected radially outward while filtering through the filter paper on the side surface of the centrifuge container. At this time, the solenoid valve provided in the solvent supply pipe is controlled to supply additional solvent from the solvent supply nozzle into the centrifuge container at a constant flow rate. The extract sprayed into the extraction chamber hits the inner surface of the cover of the extract recovery container, bounces off, accumulates in the recess of the bottom container, and is sent to the solvent / asphalt separator via the solvent discharge hole and solvent discharge pipe. Solvent is recovered by heating and vaporization and cooling, and asphalt components are separated.
After adding a certain amount of solvent, stop adding, continue high-speed centrifugation for a while, and then turn on the heater of the bottom container while heating at low speed for a certain period of time to heat the extraction chamber and heat the centrifuge container. Encourage vaporization and recovery of solvents. Finally, the heater is stopped and cold water is turned to the water cooling pipe of the bottom container to cool the extraction chamber and the centrifuge container. Since the aggregate component remains in the centrifuge container and the filler component remains in the filter paper, the amount of asphalt component can be determined by weighing the sample in advance.

By the way, the rotating shaft for rotating the centrifuge container at a high speed is supported by a bearing attached to the center of the bottom container forming the extraction chamber. While the centrifuge container is rotating at a high speed, a lot of extracted droplets are ejected from the side of the centrifuge container and bounced off the cover in the extraction chamber, and a lot adheres around the bearing. For this reason, the bearing and the rotary shaft are hermetically sealed with an oil seal so that no solvent enters.
However, due to the negative pressure generated between the bearing and the rotating shaft during high-speed rotation, the solvent adhering to the bearing around the extraction chamber is sucked toward the bearing and the rotating shaft, and the oil seal is immersed in the solvent. Since heat in the drying process is further applied in the state of being immersed in a solvent, the oil seal is thermochemically attacked at every extraction operation, so that there is a problem that it deteriorates very quickly. That is, the oil seal does not last until its useful life, and the oil seal must be replaced frequently, or the solvent enters the bearing and the ball bearing of the bearing deteriorates. There was a problem that it had to be replaced.

Utility Model Registration No. 3172746

  In view of the above-mentioned problems of the prior art, the present invention provides an asphalt extraction device that makes it difficult for a solvent to enter between the rotating shaft of a centrifuge container and a bearing and can reduce the frequency of parts replacement. Objective.

In the first aspect of the present invention, a centrifuge container that can store an asphalt mixture and a solvent and that ejects the extract from which the asphalt component is eluted is ejected radially outward, and is disposed so as to surround the centrifuge container. An extract collecting container for collecting the extract, a rotating shaft connected to the lower side of the centrifuge container, a bearing provided at the bottom of the extract collecting container and rotatably supporting the rotating shaft, and the rotating shaft and the bearing In the asphalt extraction apparatus, comprising: a rotary drive means for rotationally driving the centrifuge container; and a solvent injection means for injecting the solvent from the outside into the centrifuge container. The side surface of the container has a multi-layer structure consisting of an outer cover and an inner wall member that is supported on the inner side of the outer cover, and corresponds to the direction in which the extraction liquid is ejected from the centrifuge container. Providing an opening in part, the extract is characterized by, formed so as to bubbler between the inner member and the outer cover through the opening.
The invention according to claim 2 is characterized in that a rebound suppressing means for suppressing the rebound of the extract is provided between the opening or the outer cover and the opening.
The invention according to claim 3 is characterized in that the rebound suppressing means is in a mesh shape or a metal scrub shape.
In the invention described in claim 4, a recess is formed on the upper surface of the bottom of the extract recovery container so as to surround the rotation shaft, and the extract accumulated in the recess moves to the bearing side near the upper edge of the recess on the bearing side. It is characterized by the provision of a baffle plate that prevents this.

According to the present invention, the extract liquid ejected radially outward from the side surface of the centrifuge container is injected between the inner wall member and the outer cover through the opening of the inner wall member of the extract liquid recovery container, and the outer cover and the inner wall member The amount of liquid droplets of the extract flowing in the extract recovery container is greatly reduced, and the extract liquid adhering to the rotating shaft connected to the centrifuge container and its bearing is reduced. The amount is reduced. For this reason, even if negative pressure is generated between the rotating shaft and the bearing, the seal member is not easily affected by the extract, and the deterioration of the seal member and the ball bearing of the bearing is slowed down, and the replacement frequency of these parts is reduced. This reduces the labor and cost of maintenance.
In addition, since the bounce suppression means is provided between the opening or the outer cover and the opening, the bounce of the extract itself is reduced, so that the amount of the droplet of the extract flowing in the extract collection container is further reduced. .
In addition, the extract liquid that has been ejected radially outward from the side surface of the centrifuge container and accumulated in the recess on the top surface of the bottom of the extract liquid recovery container is attracted to the bearing side by the negative pressure between the rotating shaft and the bearing. Since it is blocked by the plate, the sealing member is not easily affected by the extract.

It is a schematic block diagram of the principal part of the asphalt extraction apparatus which concerns on this invention (Example 1). It is sectional drawing of each part of a centrifuge container. It is sectional drawing which shows the state which closed and integrated the lid | cover of the centrifuge container. It is explanatory drawing of the connection mechanism of a centrifuge container and a rotating shaft. It is an external appearance perspective view which shows the integrated inner cover and rectification | straightening member. It is operation | movement explanatory drawing of this invention.

  Hereinafter, the best mode of the present invention will be described based on examples.

An embodiment of the asphalt extraction apparatus according to the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram of a main part of an asphalt extraction apparatus.
In FIG. 1, reference numeral 1 denotes a centrifuge container that can contain an asphalt mixture and a solvent. When rotated at a high speed, an extract of asphalt components is filtered by a filter paper (see reference numeral 11 in FIG. 2) and radially outward from the side. To come out. As shown in FIGS. 2 and 3, the centrifuge container 1 includes a dish-shaped container body 2 and a disk-shaped lid 3. The container body 2 has a centrally raised cross section, and the outer side rises obliquely upward, and concentric irregularities 6 are formed on the upper surface 5 of the edge 4. Concave and convex portions 9 are formed on the lower surface 8 of the edge 7 of the lid 3 so that the concave and convex portions 6 and 9 mesh with each other when placed on the container body 2 with the center aligned. . A ring-shaped filter paper 11 is sandwiched between the ring-shaped meshing surfaces 10 so that the filler component of the extract is filtered. A boss portion 13 having a cylindrical hole 12 is fixed to the center portion of the lid 3. A plurality of air vent holes 14 are formed outside the boss portion 13 of the lid 3 so that the solvent can be injected smoothly. A central portion of the container body 2 has a stepped portion 15 on the outer surface, and a cylindrical hole 16 continuous with the hole 12 of the boss portion 13 is opened from the upper end to near the lower end and protrudes downward from the lower surface of the container body 2. The rotating shaft connecting portion 17 is screwed. The upper end of the rotating shaft connecting portion 17 is in contact with the lower end of the boss portion 13 when the lid 3 is set on the container body 2. A plurality of laterally oriented small holes 18 for solvent discharge that communicate the hole 16 and the internal space of the centrifuge container 1 are provided radially at the upper lower part of the rotary shaft connecting portion 17. The lower end portion of the hole 16 of the rotary shaft connecting portion 17 has a small diameter and is formed with a female screw portion 19. A lateral pin hole 20 is formed in the side surface of the lower end portion of the rotary shaft connecting portion 17 so that a fixing pin to be described later can be inserted. As shown in FIG. 3, a rod-like solvent introduction fitting 21 is closely inserted into the hole 12 of the boss portion 13 and the hole 16 of the rotary shaft coupling portion 17, and the tip end portion of the solvent introduction fitting 21 is screwed into the female screw portion 19. Thus, the lid 3 can be integrated with the container body 2.

The solvent introduction fitting 21 has an insertion portion 22 whose outer shape is substantially the same as the hole 12, the hole 16, and the female screw portion 19 from the central portion in the vertical direction to the lower end, and abuts the boss portion 13 on the upper side of the insertion portion 22. A stepped portion 23 is formed, and a funnel-shaped solvent injection hole 24 is provided therein. A lower end portion of the insertion portion 22 is a male screw portion 25 and is detachably screwed with the female screw portion 19. The outer periphery of the insertion portion 22 corresponding to the lower end portion of the solvent injection hole 24 has a stepped portion 26 with a smaller diameter, and when the male screw portion 25 is screwed into the female screw portion 19 of the rotary shaft connecting portion 17. A small hole 18 is formed in the rotary shaft connecting portion 17 at a location corresponding to the gap 27 between the step portion 26 and the hole 16. The step portion 26 of the insertion portion 22 is provided with a plurality of laterally directed solvent discharge holes 28 that communicate with the lower end of the solvent injection hole 24 and the gap 27 in a radial manner.
In the centrifuge container 1 with the solvent introduction fitting 21 removed, the lid 3 is opened to store a predetermined amount of the asphalt mixture to be inspected in the container body 2, and the filter paper 11 is placed on the meshing surface 10 of the container body 2 and the lid 3. The cover 3 is covered while being sandwiched, and the solvent introduction fitting 21 is inserted into the holes 12 and 16 and the male screw part 25 is screwed into the female screw part 19 (see FIG. 3).

  Returning to FIG. 1, reference numeral 30 denotes an extraction liquid recovery container that surrounds the periphery (upper and lower surfaces and side surfaces) of the centrifuge container 1, and the inside forms an extraction chamber S. The extraction liquid collection container 30 includes an aluminum bottom container 31 and a cylindrical stainless outer cover (sleeve) 32 having an upper wall and a side wall. The outer cover 32 can be moved up and down by air cylinders 33 on both sides. . The actuator 36 of the air cylinder 33 is fixed to the lower surface side of an annular flange portion 37 that is horizontally provided from the side wall near the lower end of the outer cover 32. A ring-shaped packing 38 is fitted to the upper end of the peripheral edge of the bottom container 31, and when the air cylinder 33 lowers the outer cover 32, the lower surface of the flange portion 37 is in close contact with the packing 38 and the extraction chamber S. Is designed to be sealed.

  Reference numeral 40 denotes a rotating shaft that rotates the centrifuge container 1. The rotating shaft connecting portion 17 of the centrifuge container 1 can be inserted into the connecting portion 41 at the upper end. The connecting portion 41 is provided with a pin hole 42 that linearly opposes the pin hole 20 when the rotating shaft connecting portion 17 is inserted, and a cylindrical guide 43 that is mounted outside the entrance of the pin hole 42. . As shown in FIGS. 4A and 4B, the guide 43 is provided with an L-shaped groove 44, and the fixing pin 45 is provided with a protrusion 46 that can be freely inserted into the groove 44. . When the centrifuge container 1 and the rotary shaft 40 are connected using the fixing pin 45, the fixing pin 45 is inserted into the guide 43 while the projection 46 is fitted in the groove 44, and the tip portion is inserted into the pin holes 42 and 20 (FIG. 4). (Refer to (1)). Finally, the fixing pin 45 is engaged by turning along the groove 44 (see FIG. 4 (2)).

  The rotating shaft 40 extends downward through the bottom container 31, and an inverter type motor 47 is coupled to the lower end. The motor 47 is mounted on the lower surface of the bottom container 31 via a support member (not shown). The rotary shaft 40 is rotatably supported by a cylindrical bearing 48 that is hermetically mounted in the center of the bottom container 31 in the vertical direction. The bearing 48 incorporates ball bearings 49 and 50 near the upper and lower ends. An oil seal 51 that seals the gap with the rotary shaft 40 is attached to the upper end of the bearing 48. A cylindrical lid 52 is attached to the lower end of the bearing 48, and an oil seal 53 that seals the gap between the lid 52 and the rotary shaft 40 is attached.

  A solvent supply nozzle 60 is fixed at the center of the upper surface of the outer cover 32. When the outer cover 32 is in the lowered state, the tip of the solvent supply nozzle 60 is loosely inserted into the solvent injection hole 23 of the solvent introduction fitting 21 of the centrifuge container 1. A solvent tank 61 is installed above the outer cover 32, and is connected to the solvent supply nozzle 60 via a flexible solvent supply pipe 62. An electromagnetic valve 63 is provided in the middle of the solvent supply pipe 62 so that the supply of the solvent can be controlled.

A recess 34 formed in a ring shape with the rotation shaft 40 as the center is provided on the upper surface of the bottom container 31, and is ejected radially outward from the meshing surface 10 on the side surface of the centrifuge container 1. The extract that splattered in the tank will accumulate. The bottom container 31 is provided with an extract discharge hole 35 from the bottom of the recess 34 to the bottom surface of the bottom container 31, and a solvent / asphalt separator 71 is provided in the extract discharge hole 35 via an extract discharge pipe 70. The solvent is recovered by evaporation and cooling of the solvent and the asphalt component is separated.
The bottom container 31 is also provided with a heater 72 for heating, a cooling pipe 73 for water cooling, and the like.
The outer diameter of the outer cover 32 of the extraction liquid collection container 30 is substantially the same as the inner diameter of the recess 34 of the bottom container 31, and when the outer cover 32 is in the lowered state, the lower part of the outer cover 32 is in the recess 34. Enter the extraction chamber S in a sealed state.

Inside the outer cover 32 of the extraction liquid recovery container 30, cylindrical stainless steel inner covers 80, 81 as upper and lower two-stage inner wall members are disposed with a space between the outer cover 32. . An opening 82 between the lower end of the inner cover 80 and the upper end of 81 faces the meshing surface 10 on the side surface of the centrifuge container 1. The upper end of the upper inner cover 80 extends to near the upper wall of the outer cover 32. The upper end of the inner cover 80 may be in contact with the upper wall of the outer cover 32. The lower part of the lower inner cover 81 is fixed to the outer cover 32 by a plurality of spacers 83 provided in the circumferential direction. A stainless-steel mesh-like cylindrical rectifying member 84 is fixed to the lower end portion of the inner cover 80 and the upper end portion of 81 so as to close the opening 82. The rectifying member 84 may be, for example, a member obtained by punching a large number of holes in a stainless steel plate into a honeycomb shape, a member obtained by knitting a stainless steel wire in a mesh shape, or the like.
The upper cover 80, the rectifying member 84, and the lower cover 81 are integrated in a cylindrical shape as a whole (see FIG. 5). The rectifying member 84 has a function as a bounce suppressing means, and disperses the jet of the extract from the side surface of the centrifuge container 1 to pass through the opening 82 while weakening the momentum.

  At the upper edge of the concave portion 34 of the bottom container 31 on the bearing 48 side, there is a trumpet-shaped baffle plate 90 that opens obliquely downward in a ring shape that prevents the extract liquid accumulated in the concave portion 34 from moving to the bearing 45 side. Is provided. The baffle plate 90 is sandwiched between the flange portion 54 at the upper end of the bearing 48 and the rising portion 39 inside the bottom container 31 via ring-shaped packings 91 and 92. The baffle plate 90 protrudes radially outward from the inner upper edge of the recess 34, and when the extraction liquid collected in the recess 34 is attracted to the upper surface of the bearing 48 and moves on the lower surface of the baffle plate 90, extraction is performed. It falls to the original recess 34 due to the gravity acting on the liquid.

Next, the operation of the above asphalt extraction apparatus will be described.
The outer cover 32 is raised by the air cylinder 33 to open the extraction chamber S, and the centrifuge container 1 containing a predetermined amount of asphalt mixture is connected to the rotating shaft 40. The outer cover 32 is lowered by the air cylinder 33 to close the extraction chamber S, and a solenoid valve 63 provided in the solvent injection pipe 62 is controlled to supply a predetermined amount of solvent from the solvent supply nozzle 60 into the centrifuge container 1. Then, it is allowed to stand for a certain period of time, soaking is performed, and the asphalt component is eluted in the solvent.
Thereafter, the motor 47 is rotated to rotate the centrifuge container 1 at a high speed of about 3000 revolutions per minute, and while filtering the filler component with the filter paper 11 on the side surface of the centrifuge container 1, the asphalt component is radially outward from the meshing surface 10. The melted solution is spouted out. At this time, the electromagnetic valve 63 is controlled to supply the additional solvent from the solvent supply nozzle 60 to the centrifuge container 1 at a constant flow rate. The extraction liquid ejected into the extraction chamber S is dispersed by the mesh-like rectifying member 84 provided in the opening 82 between the upper and lower inner covers 80, 81 to reduce the momentum from the opening 82 to the side of the outer cover 32. Enters, falls between the outer cover 32 and the inner covers 80 and 81 and accumulates in the recess 34 of the bottom container 31 (see arrows a to c and a ′ to c ′ in FIG. 6). At this time, since the extract liquid ejected from the centrifuge container 1 hardly bounces into the extraction chamber S, the amount of the extract liquid adhering around the center bearing 4 of the bottom container 31 is very small. Become. Therefore, even if the extract liquid around the bearing 48 is attracted by the negative pressure generated between the bearing 48 and the rotary shaft 40 due to the high-speed rotation of the rotary shaft 40, the amount of the oil seal 48 is reduced to the extract liquid thermochemically. It is possible to effectively suppress the attack.

In addition, the extract liquid accumulated in the recess 34 is sucked to the upper end side of the bearing 48 by a negative pressure generated between the bearing 45 and the rotation shaft 40 by the high-speed rotation of the rotation shaft 40, but from the recess 34 to the bearing 48 by the baffle plate 90. Is prevented from moving to the upper end side. This also can effectively prevent the oil seal 51 from being affected by the extract (see arrows d and d ′ in FIG. 6).
The extract collected in the recess 34 of the bottom container 31 is sent to the solvent / asphalt separation device 71 via the solvent discharge hole 35 and the solvent discharge pipe 70 to separate the solvent and the asphalt component and collect the solvent.

  After the addition of a certain amount of the solvent, the addition is stopped, and the high-speed centrifugation is continued for a while. Then, the heater 72 of the bottom container 31 is energized while the low-speed rotation state is maintained for a certain period of time, and the extraction chamber S is heated. To evaporate and recover the solvent. Finally, energization of the heater 72 is stopped, and cold water is turned to the water cooling pipe 73 of the bottom container 31 to cool the extraction chamber S and the centrifuge container 1. Since the aggregate component remains in the centrifuge container 1 and the filler component remains in the filter paper 11, the amount of asphalt component can be determined by measuring the sample in advance.

  According to this embodiment, the extraction liquid ejected into the extraction chamber S is dispersed by the mesh-like rectifying member 84 provided in the opening 82 between the upper and lower inner covers 80, 81, and the extraction liquid rebounds. Is suppressed between the outer cover 31 and the inner covers 80 and 81, and accumulates in the recess 34 of the bottom container 31. At this time, since the extraction liquid ejected from the centrifuge container 1 hardly bounces into the extraction chamber S, the amount of droplets of the extraction liquid adhering around the center bearing 48 of the bottom container 31 is very small. Therefore, it is possible to effectively suppress the oil seal 51 from being thermochemically attacked by the extract. Further, the extract liquid accumulated in the recess 34 of the bottom container 31 is sucked to the upper end side of the bearing 48 by the negative pressure generated between the bearing 48 and the rotation shaft 40 by the high speed rotation of the rotation shaft 40, Since the movement from 34 to the upper end side of the bearing 48 is prevented, the oil seal 51 can be effectively prevented from being attacked by the extract liquid thermochemically. Accordingly, the service life of the oil seal 51 and the bearings 49 and 50 is increased, the frequency of replacement of these components is reduced, and the labor and cost for maintenance can be suppressed.

In the above-described embodiment, the upper end of the upper inner cover extends to the vicinity of the upper wall of the outer cover, but it may extend to the upper wall and be fixedly fixed. In addition to the mesh shape, the rectifying member may have other shapes such as a metal scrub shape. Further, although the flow regulating member is provided so as to close the opening between the upper and lower inner covers, it may be provided at a position slightly away from the opening between the opening and the outer cover. In addition, the rectifying member may be omitted, and in this case, the jet of the extract that has entered from the opening between the upper and lower two-stage inner covers hits the outer cover and rebounds, but most of them hits the inner cover and falls between the outer cover and the inner cover. Since the liquid falls between the two, the droplets of the extraction liquid flowing in the extraction chamber can be greatly reduced.
In the above-described embodiment, the baffle plate has a trumpet shape opened obliquely downward, but may have a horizontal flat plate shape. Further, the cross section of the baffle plate may be wavy. Further, the baffle plate may be omitted.

  The present invention can be applied to an asphalt extraction apparatus using a centrifuge container.

DESCRIPTION OF SYMBOLS 1 Centrifugal container 10 Mating surface 30 Extract liquid collection container 31 Bottom container 32 Outer cover 34 Recessed part 40 Rotating shaft 48 Bearing 51, 53 Oil seal 80, 81 Inner cover 82 Opening 84 Rectifying member 90 Baffle plate

Claims (4)

A centrifuge container that can store an asphalt mixture and a solvent and that extracts the eluate from which the asphalt component is eluted, and ejects it radially outward, and an extract collection that is arranged so as to surround the centrifuge container and collect the extract A container, a rotating shaft connected to the lower side of the centrifuge container, a bearing provided at the bottom of the extract collection container to rotatably support the rotating shaft, and a seal member for sealing between the rotating shaft and the bearing An asphalt extraction apparatus comprising: a rotation driving means for rotating the centrifuge container; and a solvent injection means for injecting a solvent from the outside into the centrifuge container.
A side structure of the extraction liquid collection container has an outer cover and a multi-layer structure composed of an inner wall member supported at an interval inside the outer cover,
An opening is provided in a portion of the inner wall member corresponding to the extraction liquid ejection direction of the centrifuge container so that the extraction liquid is injected between the inner wall member and the outer cover through the opening.
Asphalt extraction device characterized by. Bounce suppression means for suppressing bounce of the extract is provided between the opening or the outer cover and the opening;
The asphalt extraction device according to claim 1. The rebound suppressing means is a mesh shape or a metal scrub shape,
The asphalt extraction device according to claim 2. A recess is formed on the upper surface of the bottom of the extract collection container so as to surround the rotation shaft,
Providing a baffle plate in the vicinity of the upper edge of the concave portion on the bearing side to prevent the extract liquid accumulated in the concave portion from moving to the bearing side,
The asphalt extraction device according to any one of claims 1 to 3, wherein

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