JP2005211737A - System for separating and recovering powder material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for separating and recovering a powder material capable of performing powder separation and recovery operations, and the like, simultaneously and concurrently. <P>SOLUTION: In a powder separator 2 of this system 1 for separating and recovering the powder material, a mixed material is supplied to a separation chamber 27 by own weight, the mixed material is vertically circulated in the separation chamber 27 and is allowed to collide with a filter 29 repeatedly, thereby the powder material is separated, and the powder material remained after the powder material is removed from the mixed material drops naturally from a dropping hole 25a and is supplied to an injection molding apparatus 100, or the like. The separated powder material is recovered from a powder discharge port 34 to a powder recovery apparatus 4. A material supply operation of supplying the mixed material to the separation chamber 27, a powder separation operation of separating the powder material from the mixed material, a material discharging operation of discharging the powder material remained after the powder material is separated and removed from the separation chamber 27 and an operation of recovering the separated powder material are performed simultaneously and concurrently. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  In the present invention, when unnecessary thermoplastic resin pieces and the like generated in injection molding are collected, pulverized and reused, the powder material mixed in the granular material obtained by pulverization is separated. The present invention relates to a powder material separation / recovery system suitable for use. The present invention also relates to a dust removing device suitable for use in such a system.

  In order to make effective use of resources, recycling (reuse) has been widely performed. Also in the field of thermoplastic resin injection molding, unnecessary spools, runners and other parts cut out from molded products generated by injection molding, defective molded products, etc. are collected, and these are crushed to a predetermined size, Along with virgin material, it is reused as a material for injection molding.

  Here, when the recovered thermoplastic resin piece is pulverized, fine powder is also generated in addition to the granular material of a predetermined size, so that the powder material is mixed into the granular material after pulverization. . When such a mixed material is reused as it is as an injection molding material, the following problems occur.

  First, the powder material mixed in the granular material melts faster than the granular material in the screw and heating cylinder of the molding machine that heats and melts the material and stays on the screw surface. It will burn onto the surface of the receiver and screw. The baked powder material is irregularly separated from the surface of a screw or the like and mixed into the molding material. When injection molding is performed using such a molten material, a molded defect called a black spot occurs in the molded product due to the burnt powder material. Such black spots need to be reliably prevented in the production of transparent molded products such as light guide plates and lenses, medical products, and food products.

  In addition, in the material drying process, which is the process before supplying the material to the molding machine, the powder material mixed in the granular material adheres to the inner surface of the material dryer, and sometimes the powder lump is formed at once. It peels off and is supplied to the molding machine together with the particulate material. The part of the lump of powder has a specific gravity different from that of the part of the other granular material, so that the heating and melting process in the molding machine becomes unstable and the temperature and density when the material is heated and melted are varied. For this reason, when the lump portion of the powder is supplied to the molding machine, there arises a problem that the size, weight, etc. of the molded product deviate from the standard.

In order to solve such a problem, conventionally, an apparatus for separating and removing a powder material mixed in a granular material has been proposed (see Patent Documents 1 and 2).
JP-A-10-113929 JP-A-9-29175

  Japanese Patent Laid-Open No. 10-119392 proposes a powder separation device in which a large number of holes are formed in a side wall of a funnel-shaped container to form a filter, and air inside the device is sucked out from the outside of the filter by a blower. The powder material mixed in is separated and removed. However, the powder material can be sucked and removed from the part of the granular material passing near the filter hole, but the powder material mixed in the part away from the filter cannot be sucked and removed. There is.

  In addition, the powder separation device proposed in Japanese Patent Application Laid-Open No. 9-29175 has the air in the device swirled from above by a blower through a wire mesh filter, so that the granular material in the device is swirled by air. Thus, lighter powder than the granular material is sucked through the filter and separated and discharged. However, when the air suction force is increased in order to increase the efficiency of separation and discharge, there is a problem that the wire mesh of the filter is likely to be clogged by the powder material collected there.

  On the other hand, on the path from the powder separator to the blower, an air filter for capturing the powder material sucked together with air from the inside of the separator is generally arranged. The material is prevented from being discharged to the outside. Here, when the air filter is clogged with the powder material, the ability to suck the powder from the powder separation device by the blower is lowered. For this reason, conventionally, a filter cleaning operation is performed after the powder separation and removal operation. In this filter cleaning operation, the blower motor is rotated in the reverse direction, and air is allowed to flow in the reverse direction through the air filter. So-called backwashing is performed in which the powder material clogged in the filter is forcibly removed. However, in order to perform this backwashing, it is necessary to stop and rotate the blower motor rotating in the forward direction. If the forward rotation blower motor is reversely rotated immediately, it will fall into an overload state, so it is necessary to drive the reverse rotation after the normal rotation state motor stops. Therefore, there is a problem that the operation cycle becomes long and the work efficiency is poor due to the waiting time for the motor to stop.

  Here, Japanese Patent Application No. 2002-234525 proposes a method and an apparatus for separating a powder material for efficiently separating the powder material mixed in the granular material.

  An object of the present invention is to improve the above-described apparatus to supply a mixed material, to separate a powder material, to discharge a granular material after the powder material is separated, and to separate the powder material. It is to propose a powder material separation / recovery system capable of performing the recovery operations simultaneously.

  Another object of the present invention is to propose a powder material separation / recovery system capable of efficiently performing a cleaning operation of a filter used for recovering a powder material.

  Another object of the present invention is to propose a powder removing device suitable for use in a powder material separation / recovery system.

In order to solve the above problems, a powder removing device for separating and removing a powder material from a mixed material including the powder material and the granule material of the present invention,
A powder discharge chamber;
A partition wall partitioning the powder separation chamber and the powder discharge chamber;
A filter through which the powder material attached to the partition wall can pass;
An inclined plate disposed in the powder separation chamber inclined downward from the partition wall side;
A material supply cylinder for dropping a mixed material containing a powder material and a granular material by its own weight from the outside of the powder separation chamber onto the surface of the inclined plate;
A material guide plate disposed on top of the inclined plate;
A gap for forming blown air formed in the lower end portion of the inclined plate,
An air blowing port for blowing air into the powder separation chamber through the gap;
In order to discharge the particulate material from the powder separation chamber, a dropping hole for the particulate material formed on the side of the inclined bottom surface,
It has the powder discharge port for discharging | emitting powder material from the said powder discharge chamber, It is characterized by the above-mentioned.

In addition, the powder material separation and recovery system of the present invention,
It has a powder removing device having the above configuration, a powder collecting device for collecting the powder material removed in the powder removing device, and an air blowing / suction device,
The powder recovery device
A powder recovery filter capable of capturing the powder material from the passing air stream;
A first chamber and a second chamber partitioned by the powder recovery filter;
A powder collection port communicating with the powder discharge port of the powder removing device to collect the powder material in the first chamber;
An air suction port for sucking air from the second chamber is provided.

The air blowing / suction device is
An air discharge port communicating with the air blowing port of the dust removing device;
And an air suction port communicating with the air suction port of the powder recovery device.

  In the powder material separation / recovery system with this configuration, when the air blowing / suction device is driven, air is blown from the air blowing port of the dust removing device and separated from the gap at the lower end of the inclined plate of the separation chamber. Air is blown up into the room. The mixed material is charged from the material supply cylinder by its own weight, and the charged mixed material slides down along the inclined plate, and is blown upward on the air blown from the gap. The mixed material blown up is guided by the material guide plate, collides with the filter of the partition wall located on the opposite side, and falls again to the upper end side of the inclined plate. Each time the mixed material circulates up and down by the blown air flow and collides with the filter, only the powder material contained in the mixed material is discharged to the discharge chamber side through the filter. The granular material after the powder material is separated and removed falls by its own weight from a dropping hole located on the side of the inclined plate. For example, if the lower part of the drop hole is connected to the material supply port of the injection molding apparatus, the granular material after the powder material is separated and removed can be supplied to the injection molding apparatus.

  On the other hand, since the discharge chamber of the powder removal device is sucked by the air blowing / suction device through the powder recovery device, the powder material discharged into the discharge chamber rides on the air flow and is discharged from the powder discharge port. It is sucked into the collecting device and collected in the first chamber from the powder collecting port. The air flow sucked into the first chamber is sucked into the second chamber through the powder recovery filter, and the powder material contained in the air flow is separated and removed by the filter. It returns to the side of the air suction port of the air blowing / suction device through the second chamber. In this manner, the powder material separated and removed by the powder removing device is collected in the first chamber of the powder collecting device.

  Therefore, in the powder removing apparatus of the present invention, the mixed material supply operation, the powder material separation / removal operation, and the granule material discharge operation after the powder material is separated and removed can be performed simultaneously. Similarly, in the powder material separation / recovery system of the present invention, the mixed material supply operation, the powder material separation / removal operation, the granular material discharge operation after the powder material is separated and removed, and the separation are performed. The powder material can be collected in parallel.

  Here, the system of the present invention can be configured to have a control device that drives and controls the dust removing device, the powder collecting device, and the air blowing / suction device. In this case, a material supply pipe through which the granular material dropped from the drop hole passes and a material sensor for detecting the presence or absence of the granular material passing through the material supply pipe are arranged in the powder removing device, and the material When the sensor detects that there is no granular material, the control device drives the air blowing / suction device for a predetermined time to separate the powder by the powder removing device and the powder by the powder collecting device. A collection operation may be performed.

  In addition, the powder recovery device, the air blowing switching valve for selectively communicating the air discharge port of the air blowing and suction device to the second chamber and the air blowing port of the powder removing device, An air suction switching valve for selectively communicating the air suction port of the air blowing / suction device to the second chamber and the atmosphere opening side; and an atmosphere opening valve for opening the first chamber to the atmosphere; It can be set as the structure provided with.

  In this case, the control device switches the air blowing switching valve, connects the air discharge port of the air blowing / suction device to the second chamber, switches the air suction switching valve, The air suction port of the air blowing / suction device is opened to the atmosphere, the first chamber is opened to the atmosphere via the atmosphere release valve, and the air blowing / suction device is driven in this state to The powder recovery filter can be cleaned by flowing air from the second chamber to the first chamber through the recovery filter.

  In this way, it is not necessary to switch the rotation direction of a drive motor such as a blower constituting the air blowing / suction device, and to switch the direction of the air flow flowing through the filter. You can enter immediately. Therefore, the filter cleaning operation can be performed efficiently.

  Here, after the powder separation operation and the powder recovery operation are performed for a predetermined time by the control device, the cleaning operation of the powder recovery filter may be performed for a predetermined time.

  Next, a powder material discharge port formed at the bottom of the first chamber and an on-off valve for opening and closing the powder material discharge port are arranged in the powder recovery device, and the powder material collected in the first chamber May be collected in a powder collection bag or the like. In this case, the powder material can be discharged from the second chamber without manual operation if the control device drives the on-off valve for a predetermined time after the cleaning operation is completed to open the powder material discharge port. .

  The powder material separation / recovery system of the present invention is suitable for separating powder material from a mixed material obtained by collecting and crushing unnecessary thermoplastic resin pieces generated by injection molding. . If the powder removal device is attached to the material supply port of the injection molding device, only the granular material after the powder material has been reliably separated and removed can be supplied to the injection molding device. It is possible to suppress the occurrence of molding defects called molding defects and molding defects due to the fact that the size and weight of molded products are out of the standard due to the fact that powder material is supplied to the injection molding machine as a lump. Can be manufactured with high yield.

  In the powder removing apparatus of the present invention, the mixed material supply operation, the powder material separation / removal operation, and the particle material discharge operation after the powder material is separated and removed can be performed in parallel. Similarly, in the powder material separation / recovery system of the present invention, the mixed material supply operation, the powder material separation / removal operation, the granular material discharge operation after the powder material is separated and removed, and the separation are performed. The powder material can be collected in parallel. Therefore, it is possible to efficiently separate and recover the powder material from the mixed material.

  In the powder removing apparatus of the present invention, the mixed material is repeatedly collided with the filter by the air flow circulating up and down to separate and remove the powder material contained in the mixed material, and only the granular material is contained in the separation chamber. To leave. Since the mixed material repeatedly hits the filter, particles clogged in the filter are shaken off by the collision of the mixed material. Therefore, clogging of the filter can be prevented, and the powder material can be separated and removed efficiently and continuously from the entire mixed material.

  Furthermore, in the powder recovery device of the present invention, the air flow path between the air blowing / suction device is switched by the switching valve, thereby changing the direction of the air flow flowing through the filter for capturing the powder material, The filter is being cleaned. Therefore, since the switching from the powder recovery operation to the filter cleaning operation (back washing operation) can be performed immediately, the operation cycle can be shortened as compared with the case where the blower motor is reversely rotated.

  An example of a powder material separation / recovery system to which the present invention is applied will be described below with reference to the drawings.

(overall structure)
FIG. 1 is an explanatory view showing an example in which a powder material separation / collection system is attached to a material supply system of an injection molding apparatus. The separation / recovery system 1 of the powder material of this example is a powder material from a mixture of a thermoplastic resin containing a granular material and a powder material obtained by being recovered and pulverized after injection molding. A powder removing device 2 that separates the powder material from the mixed material containing the powder material and the granular material, and a powder that collects the separated powder material from the powder removing device 2. The recovery device 4, the air blowing / suction device 8 such as a blower for forming an air flow for separating and recovering the powder material in the powder removing device 2 and the powder recovery device 4, and for controlling the operation And a control device 10. The dust removing device 2 is attached between the material supply port 101 of the injection molding device 100 and the material supply hopper 102.

(Powder removal device)
FIG. 2 is a schematic cross-sectional view showing the internal structure of the powder removing device 2. FIG. 2 (a) is a schematic cross-sectional view taken along the line AA in FIG. 2 (b), and FIG. These are the schematic sectional drawings of the part cut | disconnected by the BB line of Fig.2 (a). The dust removing device 2 includes a dust collecting box 21, which includes a rectangular tube portion 21 a and a tapered tubular portion 21 b extending downward from the lower end, and the upper end of the rectangular tube portion 21 a is It is blocked by the top plate 21c. A hopper connection hole 21d is formed at the center of the top plate 21c, and a material supply hopper 102 is coaxially attached to the connection hole 21d. A transparent glass tube 22 is coaxially attached to the lower end opening of the powder collecting box 21, and a flange 23 attached to the lower end of the transparent glass tube 22 is fixed to the material supply port 101 of the injection molding apparatus 100. . A material sensor 24 is disposed outside the transparent glass tube 22 to detect the presence or absence of the particulate material that falls there.

  The inside of the powder collecting box 21 is partitioned up and down by a horizontal partition wall 25 disposed between the rectangular tube portion 21a and the tubular portion 21b. The upper internal space is partitioned forward and backward by a vertical partition wall 26, the front wide compartment is a powder separation chamber 27, and the rear narrow compartment is a powder discharge chamber 28. A rectangular filter 29 is attached to the upper half of the vertical partition wall 26. The filter 29 is formed by forming slits of a certain width extending vertically at regular intervals. The width of the slit is such that the powder material contained in the mixed material can pass but the granule material cannot pass.

  An inclined plate 30 that is inclined downward from the vertical partition wall 26 side toward the front is disposed inside the powder separation chamber 27. The inclined plate 30 extends from one side surface 27a of the powder separation chamber 27 to a position near the other side surface 27b. A material dropping hole 25a is formed in a portion of the horizontal partition wall 25 facing the gap between the inclined plate 30 and the side surface 27b. Further, a gap 31 for forming blown air is formed between the front end edge of the inclined plate 30 and the front surface 27 c of the powder separation chamber 27. A rectangular material guide plate 32 is attached directly above the front portion of the inclined plate 30 so as to be inclined upward from the front surface 27c toward the rear. Here, a substantially L-shaped material supply tube 33 is disposed along the side surface 27a from the top surface 27d of the powder separation chamber 27, and the upper end opening of the material supply tube 33 communicates with the hopper connection hole 21d. . The lower end opening 33a of the material supply cylinder 33 is located in the vicinity of the middle portion of the inclined plate 30 in the front-rear direction. The rear end of the material guide plate 32 extends to the side surface of the material supply tube 33.

  A powder discharge port 34 is attached to the upper surface of the backside of the powder collecting box 21, and this powder discharge port 34 communicates with the powder discharge chamber 28. An air blowing port 35 is attached to the lower side of the powder discharge port 34, and the air blowing port 35 passes through a communication hole 26 a formed in the lower end portion of the vertical partition wall 26 and is in the powder separation chamber 27. It communicates with the lower space 36 of the inclined plate 30.

  The material supply hopper 102 attached to the upper surface of the dust collecting box 21 is formed with a material supply port 103 through which a mixed material is supplied from a material supply source (not shown). Is formed with an air suction port 104. The air after the mixed material is supplied into the material supply hopper 102 from the material supply port 103 is sucked from the air suction port 104 through the filter 105.

(Powder recovery device)
FIG. 3 is a schematic sectional view showing the powder recovery device 4. The powder recovery device 4 includes a cylindrical powder recovery box 41 with a lower end portion constricted in a truncated cone shape, and a powder discharge port 42 is formed at the lower end of the powder recovery box 41. 42 can be opened and closed by an on-off valve 43. Inside the powder collection box 41, a concentric cylindrical powder capturing air filter 44 is disposed. The lower end opening of the air filter 44 is sealed with a disk 45. An annular plate 46 is attached to the upper end surface of the air filter 44, and the outer peripheral edge of the annular plate 46 is in close contact with the inner peripheral surface portion of the powder collection box 41. Therefore, the internal space of the powder recovery box 41 is partitioned vertically by the air filter 44, the disk 45 and the annular plate 46, the lower side is the first chamber 47 for recovering the powder material, and the upper side is the second. It is a chamber 48.

  A powder recovery port 49 is formed in the lower first chamber 47, and this powder recovery port 49 communicates with the powder discharge port 34 of the powder removing device 2 via the recovery pipe 51. An air communication port 52 is formed in the first chamber 47, and the air communication port 52 can communicate with the air opening port 55 through a filter box 54 in which a filter 53 is built. Normally, the communication port 56 between the air release port 55 and the filter box 54 is closed by the air release valve 57.

  In the upper second chamber 48, communication ports 58 and 59 are formed at two locations. One communication port 58 can communicate with the air blowing port 62 by switching the air blowing switching valve 61. The air blowing port 62 communicates with the air discharge port 81 of the air blowing / suction device 8 via the air supply pipe 83, and the air blowing port 63 communicates with the air blowing of the dust removing device 2 via the communication tube 64. It communicates with the mouth 35. Therefore, in a state where the communication port 58 is closed by the air blowing switching valve 61, the air blowing port 62 communicates with the air blowing port 63, and the air bypasses the powder collection device 4 and the dust removing device 2. Supplied to the side. When the air blowing switching valve 61 is opened, the air blowing port 62 and the air blowing port 63 are blocked, and instead, the air blowing port 62 communicates with the communication port 58. Therefore, the air from the air blowing / suction device 8 is supplied from the air blowing port 62 through the communication port 58 into the second chamber 48.

  The other communication port 59 can communicate with the air suction port 66 by switching the air suction switching valve 65. The air suction port 66 communicates with the air suction port 82 of the air blowing / suction device 8 via the air suction tube 84. Normally, the air suction switching valve 65 is open, and the communication port 59 communicates with the air suction port 66. When the air suction switching valve 65 is closed, the communication port 59 is closed, and the air suction port 66 communicates with the air release port 67 with a filter.

(Description of operation)
The control device 10 drives and controls the air blowing / suction device 8 based on the output of the material sensor 24 of the powder removing device 2, and according to a predetermined sequence, the air blowing switching valve 61, the air suction switching valve 65, the atmosphere The opening valve 57 and the opening / closing valve 43 are driven and controlled. Thereby, the operation of separating the powder material from the mixed material by the powder removing device 2, the operation of collecting the separated powder material by the powder collecting device 4, the operation of cleaning the air filter 44 of the powder collecting device 4, and the powder collecting device 4 is performed to discharge the collected powder material.

  First, the separation operation of the powder material from the mixed material and the recovery operation of the separated powder material will be described with reference to FIG. 4 and FIG. When the control device 10 detects that the granular material supplied to the injection molding device 100 through the transparent glass tube 22 is lost by the material sensor 24 of the powder removing device 2, the control device 10 drives the air blowing / suction device 8. . In the powder recovery apparatus 4, the communication port 58 is blocked by the air blowing switching valve 61, the communication port 59 is opened, and the powder discharge port 42 is closed. Therefore, the air from the air discharge port 81 of the air blowing / suction device 8 is supplied into the separation chamber 27 from the air blowing port 35 of the dust removing device 2, and passes through the filter 29 from here to the powder discharge chamber 28. It is discharged from the powder discharge port 34, supplied from the powder recovery port 49 of the powder recovery device 4 to the first chamber 47, passes through the air filter 44, passes through the communication port 59 from the second chamber 48, and blows out air from the air suction port 66. An air circulation path that returns to the air suction port 82 of the suction device 8 is formed.

  As shown in FIG. 5, in the separation chamber 27 of the powder removing device 2, air is blown up into the separation chamber 27 from the gap 31 at the front end of the inclined plate 30. The mixed material falls on the inclined plate 30 due to its own weight by the material supply cylinder 33 and slides along the inclined plate 30. The mixed material sliding down to the front end of the inclined plate 30 is blown upward by the blown air. The blown-up mixed material is guided rearward by the material guide plate 32, hits the filter 29 disposed on the rear surface of the separation chamber 27, and falls again onto the inclined plate 30 along the filter 29. While such vertical circulation is repeated, the powder material is separated through the filter 29 and removed to the back side of the powder discharge chamber 28. The granular material remaining after the powder material is removed falls through the transparent glass tube 22 from the drop hole 25a formed on the side of the inclined plate 30, and the material supply port 101 of the injection molding apparatus 100 is dropped. From the inside of the apparatus. The powder material discharged into the powder discharge chamber 28 is discharged from the powder discharge port 34, recovered from the powder recovery port 49 of the powder recovery device 4 into the first chamber 47, and collected there. After performing the powder separation operation and the powder recovery operation for a preset time, the air blowing / suction device 8 is stopped.

  In such a powder separation operation, the granular material having a size substantially the same as the width of the slit of the filter 29 is clogged in the slit, the clogging of the filter 29 may occur, and the powder separation efficiency may be reduced. . However, in this example, the mixed material circulates and repeatedly collides with the filter 29. Therefore, even if the granule material is clogged in the slit, the clogged granule material is knocked down from the slit by the subsequent mixed material colliding with the filter 29. Therefore, clogging does not occur in the slit. Further, since the mixed material is struck against the filter 29, the powder material adhering to the granular material is also surely separated from the granular material and separated and discharged to the powder discharge chamber 28 through the slit.

  After performing the powder separation operation and the powder recovery operation for a set time, the cleaning operation of the air filter 44 of the powder recovery device 4 is performed for a preset time. Referring to FIG. 6, in the cleaning operation, the air blowing / suction device 8 continues to be driven as it is, the air blowing switching valve 61 is switched to open the communication port 58, and the air to the dust removing device 2 is opened. And the air is blown into the second chamber 48 of the powder recovery device 4. Further, the air suction switching valve 65 is switched to close the communication port 59, and the atmosphere release port 67 is communicated with the air suction port 82 side of the air blowing / suction device 8 through the air suction port 66. Further, the air release valve 57 of the first chamber 47 is opened, and the first chamber 47 is opened to the atmosphere. As a result, the air suction port 82 of the air blowing / suction device 8 sucks air from the atmosphere side through the air suction port 66 and the atmosphere release port 67 of the powder recovery device 4, and the air discharged from the air discharge port 81 is Then, it is blown into the second chamber 48 of the powder collecting device 4, flows from here through the air filter 44 to the first chamber 47, and is discharged from the first chamber 47 through the atmosphere opening 55 to the atmosphere side. Therefore, air flows from the second chamber 48 to the first chamber 47, contrary to the above powder recovery operation, so that the powder material captured by the air filter 44 is blown out to the first chamber 47 side, The clogging of the air filter 44 is eliminated.

  After performing this cleaning operation for a set time, the air blowing / suction device 8 is stopped, and the opening / closing valve 43 of the powder collecting device 4 is driven to open the powder discharge port 42. FIG. 7 shows this state. As a result, the powder material accumulated in the first chamber 47 of the powder recovery device 4 falls from the powder discharge port 42 and is discharged. The discharged powder material is collected, for example, in a collection bag.

  Thereafter, the on-off valve 43 is closed, and the air blowing switching valve 61, the air suction switching valve 65, and the standby release valve 57 are returned to return to a standby state in which the powder removing operation and the powder collecting operation can be performed. In this state, it waits until it is detected by the material sensor 24 that the granular material has been lost.

  As described above, in this example, when the powder material is separated and removed in the powder removing device 2, the mixed material repeatedly collides with the filter 29 that separates the powder material. Therefore, even when a lump or granular material of powder material is temporarily clogged in the slit of the filter 29, the filter 29 is clogged because it is knocked down from the slit by the mixed material that collides next. Therefore, the powder material can be separated and removed continuously and extremely efficiently without any unevenness throughout the material.

  Moreover, the mixed material thrown into the separation chamber 27 of the powder removing apparatus 2 from the hopper 102 is guided by the material supply pipe 33 and falls onto the inclined plate 30 of the separation chamber 27 by its own weight. Further, the granule material after the powder material is removed by circulating in the separation chamber 27 falls from the drop hole 25a formed on the side of the separation chamber 27 by its own weight, and the injection molding apparatus 100 Supplied on the side. Further, the separated powder material is recovered by the powder recovery device 4 through the powder discharge chamber 28.

  Therefore, the mixed material supply operation, the powder separation operation for separating the powder material from the mixed material, the material discharge operation for discharging the granular material after the powder material is separated and removed, and the separated powder material is recovered. The collecting operation to be performed can be performed in parallel. In addition, since the system can be configured compactly, there is an advantage that installation space can be reduced.

  Further, in the powder recovery device 4, the air filter 44 can be cleaned by switching the direction of the air flowing through the air filter 44 without switching the air blowing / suction direction of the air blowing / suction device 8. Therefore, as compared with the case where the cleaning is performed by reversing the blower motor, the cleaning operation can be started immediately without requiring a waiting time, so that the operation cycle can be shortened.

  The powder material separation / recovery system 1 of the present invention separates and removes powder materials mixed with tablets, grains, etc., in addition to separating and removing powder materials from resin molding granule materials. It can also be used.

It is explanatory drawing which shows the example which applied the isolation | separation / collection | recovery system of the powder material to which this invention is applied to the material supply system of an injection molding apparatus. It is a schematic sectional drawing which shows the powder removal apparatus in the isolation | separation / collection | recovery system of the powder material of FIG. It is a schematic sectional drawing which shows the powder collection | recovery apparatus in the isolation | separation / collection | recovery system of the powder material of FIG. It is explanatory drawing which shows the powder removal operation | movement and powder collection | recovery operation | movement in the isolation | separation / collection | recovery system of the powder material of FIG. It is explanatory drawing which shows the state in the powder removal apparatus in powder removal operation | movement. It is explanatory drawing which shows the filter cleaning operation | movement in the isolation | separation / collection | recovery system of the powder material of FIG. It is explanatory drawing which shows the powder discharge | emission operation | movement in the isolation | separation / collection | recovery system of the powder material of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder material separation and collection system 2 Powder removal device 22 Transparent glass tube 24 Material sensor 26 Vertical partition wall 27 Separation chamber 28 Powder discharge chamber 29 Filter 30 Inclined plate 31 Gap 33 Material supply tube 34 Powder discharge port 35 Air blowing Port 4 Powder recovery device 42 Powder discharge port 43 On-off valve 44 Air filter 47 First chamber 48 Second chamber 49 Powder recovery port 52 Air communication port 55 Air release port 57 Air release valve 58, 59 Communication port 61 Air blowing switching valve 63 Air outlet 65 Air suction switching valve 67 Air release port 8 Air blowing / suction device 81 Air outlet 82 Air suction port 10 Control device 100 Injection molding device 101 Material supply port 102 Hopper

Claims (8)

A powder separation chamber;
A powder discharge chamber;
A partition wall partitioning the powder separation chamber and the powder discharge chamber;
A filter through which the powder material attached to the partition wall can pass;
An inclined plate disposed in the powder separation chamber inclined downward from the partition wall side;
A material supply cylinder for dropping a mixed material containing a powder material and a granular material by its own weight from the outside of the powder separation chamber onto the surface of the inclined plate;
A material guide plate disposed on top of the inclined plate;
A gap for forming blown air formed in the lower end portion of the inclined plate,
An air blowing port for blowing air into the powder separation chamber through the gap;
In order to discharge the particulate material from the powder separation chamber, a dropping hole for the particulate material formed on the side of the inclined bottom surface,
A powder removing device having a powder discharge port for discharging the powder material from the powder discharge chamber. A dust removing device according to claim 1;
A powder recovery device for recovering the powder material removed in the powder removing device;
An air blowing / suction device,
The powder recovery device
A powder recovery filter capable of capturing the powder material from the passing air stream;
A first chamber and a second chamber partitioned by the powder recovery filter;
A powder collection port communicating with the powder discharge port of the powder removing device to collect the powder material in the first chamber;
An air suction port for sucking air from the second chamber,
The air blowing / suction device is
An air discharge port communicating with the air blowing port of the dust removing device;
A powder material separation / collection system comprising: an air suction port communicating with the air suction port of the powder recovery device. In claim 2,
Having a control device for driving and controlling the dust removing device, the powder collecting device and the air blowing / suction device;
The powder removing device is
A material supply pipe through which the granular material dropped from the drop hole passes,
A material sensor for detecting the presence or absence of granular material passing through the material supply pipe,
When the material sensor detects that there is no granular material, the control device drives the air blowing / suction device for a predetermined time to perform the powder separating operation by the powder removing device and the powder collecting device. Powder material separation / recovery system that performs powder recovery operations. In claim 3,
The powder recovery device
An air blowing switching valve for selectively communicating the air discharge port of the air blowing / suction device with the second chamber and the air blowing port of the dust removing device;
An air suction switching valve for selectively communicating the air suction port of the air blowing / suction device to the second chamber and the atmosphere opening side;
An atmosphere release valve for opening the first chamber to the atmosphere;
The control device switches the air blowing switching valve to connect the air discharge port of the air blowing / suction device to the second chamber and switches the air suction switching valve to switch the air blowing / The air suction port of the suction device is opened to the atmosphere, the first chamber is opened to the atmosphere via the atmosphere release valve, and the air blowing / suction device is driven in this state via the powder recovery filter. A powder material separation and recovery system for cleaning the powder recovery filter by flowing air from the second chamber to the first chamber. In claim 4,
The control device is a powder material separation / collection system that performs a cleaning operation of the powder recovery filter for a predetermined time after performing the powder separation operation and the powder recovery operation for a predetermined time. In claim 5,
The powder recovery device
A powder material discharge port formed at the bottom of the first chamber;
A powder material separation / recovery system comprising an opening / closing valve for opening and closing the powder material discharge port. In claim 6,
The control device is a powder material separation / recovery system that opens the powder material discharge port by driving the on-off valve for a predetermined time after the cleaning operation is completed. In any one of claims 1 to 7,
The mixed material is a thermoplastic resin material,
A powder material separation / collection system in which the powder removing device is attached to a material supply port of an injection molding device.

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