JP2021137988A - Cleaning device for powder slash molding die - Google Patents

Abstract

To provide a cleaning device for cleaning a molding die using a blast material, which can recover and reuse the blast material better than before.SOLUTION: The cleaning device comprises: a die support unit capable of attaching and detaching a die; a cleaning booth being a sealed space when cleaning the die; a blast material injection unit for injecting a blast material into the die provided inside the cleaning booth; a blast material recovery unit provided at a lower end in a vertical direction of the cleaning booth and recovering the blast material used for cleaning; and a blast material transport unit for sending the blast material recovered by the blast material recovery unit to the blast material injection unit. The blast material recovery unit includes a screw feeder for sending the blast material that has reached the blast material recovery unit in a horizontal direction. The blast material transport unit includes a bucket elevator for receiving the blast material sent by the screw feeder and sending it to the blast material injection unit, and synchronization means for synchronizing operations of the screw feeder and the bucket elevator.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cleaning device for a powder slash molding die (hereinafter, may be simply referred to as a molding die). In particular, the present invention relates to a cleaning device that uses a blast material as a cleaning material and that can easily recover and reuse the blast material even if it has a simple configuration.

The powder slash molding method is a method of manufacturing a molded product by melting resin powder with a molding die. This molding method is used, for example, for manufacturing the skin of an instrument panel of an automobile. Therefore, the molding surface of the molding die is formed with fine irregularities for giving a three-dimensional decoration such as a grain pattern to the molded product.

When such a molding die is used repeatedly, the plasticizer or the like contained in the resin powder penetrates into the fine irregularities on the molding surface of the molding die and remains, resulting in three-dimensionality such as a grain pattern in the three-dimensional molded product. There was a problem that the decorativeness of the three-dimensional molded product was impaired by gradually lowering the amount.

Therefore, there is a means of spraying a blast material to remove the residue adhering to such a molded surface, collecting and separating the sprayed blast material and the residue that has peeled off, and reusing the blast material. Various proposals have been made.
For example, a cleaning device for a mold for powder slash molding according to the applicant of this application has been proposed (see Patent Document 1).
More specifically, as shown in FIG. 9, the cleaning booth 201, the mold support portion 203, the blast processing unit 205 for spraying walnut shells and the like as the blast material 217, and the blast material recovery unit 207 are provided. ing.
Further, the cleaning booth 201 is surrounded by the mold support portion 203, the first inclined plate 209, the second inclined plate 211, and the third inclined plate 213, and is surrounded by the second inclined plate 211 and the second inclined plate 211. In cooperation with the inclined plate 213 of No. 3, it has a substantially V-shaped structure toward the blast material recovery unit 207.
Further, the blast processing unit 205 includes an injection device 205a and a robot 205b, and the blast material recovery unit 207 sucks and collects used blast material and the like arranged on the tip side of a substantially V-shaped structural part. Includes a tubular suction member 207a with a suction port.
Then, the used blast material 217 and the like collected via the cylindrical suction member 207a are separated by a cyclone (not shown) and then pumped to the blast processing unit 205 for reuse. Has been proposed.

In addition, it is related to the shot blasting device that projects the cleaning material on the work piece to remove oxide film, burrs, etc., and the cleaning material can be circulated and used repeatedly to perform the cleaning work. An apparatus has been proposed (see Patent Document 2).
More specifically, as shown in FIG. 10, the vertical transport means 306 that transports the recovered shot including the cleaning material, burrs, dust, and dust after cleaning to a position higher than the projectors 302 and 303. The longitudinal transport means 306 includes a lateral transfer means 307 that laterally transfers the collected shots emitted above the projector to the upper part of the projector.
Further, it is provided with slits (not shown) juxtaposed below the lateral transfer means 307 that guides the collected shots transferred by the lateral transfer means 307 downward little by little.
In addition, the first separation means (not shown) that receives the recovery shot guided by the slit and excludes the one that exceeds the size of the cleaning material and discharges it, and the size of the cleaning material by blowing wind on the recovery shot. It is provided with a second separation means (not shown) for excluding and discharging less than one.
Then, a shot blasting device 300 has been proposed in which the cleaning material separated by the first separating means and the second separating means is sent to the projectors 302 and 303.

Japanese Patent No. 6352455 (Claim 56, etc.) Japanese Unexamined Patent Publication No. 2016-168657 (Claims, etc.)

Here, since the conventional cleaning device 200 described in Patent Document 1 cleans the residue remaining in the molding die 215 with the blast material 217, chemicals such as an acid aqueous solution and an alkaline aqueous solution are used. It was a useful device with advantages such as environmental friendliness as compared with the case of using chemicals.
However, although there is a description that the conventional cleaning device 200 collects the blast material 217, it is a suction method and drops from the sucked blast material 217 or the molding die 215 to the cylindrical suction member 207a. If the amount of the residue or the like is large, the suction force does not work up to the tip of the tubular suction member 207a, and the blast material 217 may not be recovered satisfactorily.
Further, if the blast material 217 and the dropped residue are relatively large, it may not be possible to transfer the blast material 217 from the cylindrical suction member 207a installed at the lower part to the cyclone installed at the upper part satisfactorily.
Therefore, from the viewpoint of recovery and reuse of the blast material 217, it is not always satisfactory, and further improvement has been desired.

Further, although there is a description that the shot blasting device 300 described in Patent Document 2 includes a lower screw conveyor 305 and a bucket elevator as a vertical transport means 306, a specific structure is mentioned. However, depending on the type of cleaning material, etc., it may not be possible to recover satisfactorily.
Further, since it is necessary to lift the cleaning material by the bucket elevator and then transfer it again by the upper screw conveyor as the lateral transfer means 307, it may be complicated to synchronize each configuration and adjust the balance of the input amount. rice field.

The present invention has been made in view of the above points, and is a cleaning device for cleaning a molding die using a blast material. The purpose is to provide a cleaning device that can be performed better.

According to the present invention, a mold support portion to which a mold to be cleaned can be attached and detached, a cleaning booth which is a closed space when cleaning the molding mold, and a blast material provided in the cleaning booth for the molding mold. The blast material injection unit that injects the blast material, the blast material recovery unit that is provided at the lower end of the cleaning booth in the vertical direction and used for cleaning, and the blast material recovery unit that horizontally transfers the blast material, and the blast material that is collected by the blast material recovery unit is blasted. A cleaning device for a powder slush molding die including a blast material transport unit for feeding to a material injection unit, wherein the blast material recovery unit includes a screw feeder that horizontally feeds the blast material that has reached the blast material recovery unit. , When the bucket elevator that receives the blast material sent by the screw feeder and sends it to the blast material injection unit and the bucket of the bucket elevator faces the blast material discharge port of the blast material recovery unit. , A synchronization means for delivering the blast material from the screw feeder to the bucket, and a powder slush molding die cleaning device, which comprises, can solve the above-mentioned problems.

According to the configuration of the cleaning device of the present invention, the blast material sprayed onto the cleaning portion of the molding die removes the residue remaining on the cleaning portion and then falls vertically downward in the cleaning booth. And / or slide down the inner wall of the cleaning booth to the screw feeder of the blast material recovery section. Then, when the bucket of the bucket elevator faces the blast material discharge port of the blast material recovery unit, the synchronization means passes the blast material from the screw feeder to the bucket, so that the blast material does not spill to any place other than the bucket. It is put into the bucket.
Further, since the screw feeder is used, the blast material can be transferred more favorably than when the blast material is sent by suction. Further, the amount of the blast material charged into the bucket can be determined by any suitable method, for example, by detecting the filling height of the blast material in the bucket, detecting the weight fluctuation of the bucket, using a hopper, or the like, or by using the screw feeder rotation speed or the like. It can be grasped by the rotation time and the like.
The synchronization means controls the above-mentioned delivery according to the grasped information. After the blast material has been charged into the bucket, the bucket elevator feeds, for example, the conveyor belts of the bucket by a predetermined number of buckets (1 to half of the bucket elevators). At that time, of the plurality of buckets of the bucket elevator, the bucket that reaches the discharge port (connection path to the blast material injection device) of the bucket elevator discharges the blast material to the path to the injection device.
Therefore, in this cleaning device, the blast material used for mold cleaning can be recovered and reused better than before.

In constructing the powder slush molding die cleaning device of the present invention, the synchronization means rotates a sensor that detects that the bucket is at the blast material discharge port and a screw feeder in response to a signal detected by the sensor. It is preferable to include a control mechanism.
With this configuration, it is possible to prevent the blast material remaining in the blast material discharge port from falling without entering the bucket, and it is easy for the bucket of the blast material recovery unit to the blast material transfer unit. And surely, the blast material can be delivered.

In constructing the cleaning device for the powder slash molding die of the present invention, the synchronization means includes a sensor that detects that the bucket is at the blast material discharge port, and a hopper that opens and closes according to the signal detected by the sensor. , Are preferably included.
With this configuration, it is possible to prevent the blast material remaining in the blast material outlet from falling without entering the bucket, and from the blast material recovery unit to the bucket of the blast material transfer unit. Blast material can be delivered easily and reliably.

In constructing the cleaning device for the powder slash molding die of the present invention, it is preferable that the blast material recovery unit is provided with an opening for exposing the screw feeder on the cleaning booth side of the screw feeder.
With this configuration, the cleaning booth side of the screw feeder can be opened, and the blast material falling from the cleaning booth to the screw feeder side can be efficiently dropped onto the screw feeder.

In constructing the cleaning device for the powder slash molding die of the present invention, the blast material recovery unit is provided with a protective member on the upper surface of the opening for separating the cleaning booth and the blast material recovery unit. The member preferably has a plurality of recovery holes for taking the blast material deposited in the cleaning booth into the blast material recovery section along the horizontal direction.
With such a configuration, a large amount of blast material does not enter the blast material recovery unit at one time, and it is possible to prevent an excessive force from being applied to drive the screw feeder.

In constructing the powder slash molding die cleaning device of the present invention, it is preferable that the pitch of the recovery holes is equal to or less than the pitch of the spiral blade of the screw feeder.
With this configuration, the blast material can enter between the spiral blades of the respective screw feeders, and the blast material can be transferred reliably and efficiently.

In constructing the powder slash molding die cleaning device of the present invention, it is preferable to gradually widen the pitch of the spiral blades of the screw feeder toward the blast material conveying portion.
With this configuration, it is possible to prevent the blast material transported from the upstream from filling the downstream side of the blast material recovery unit and preventing the downstream blast material from being taken in.
That is, by gradually increasing the pitch of the spiral blades of the screw feeder on the downstream side, the volume between the spiral blades on the downstream side is increased, and the transfer distance per rotation of the screw feeder is increased to increase the transfer distance on the downstream side. The transfer speed can be increased.

In configuring the cleaning device for the powder slash molding die of the present invention, a static eliminating air supply unit for blowing static eliminating air for removing static electricity is provided on the screw feeder, the inner wall of the cleaning booth, or one of them. Is preferable.
With such a configuration, it is possible to prevent the blast material injected from the blast material injection unit from being charged when it comes into contact with the molding die to be cleaned.
That is, the charged blast material may adhere to the inner wall of the cleaning booth or the screw feeder, making it difficult to move and recover. However, if a static electricity elimination air supply unit is provided, the influence of static electricity can be reduced, and the blast material Recovery can be facilitated.

In constructing the cleaning device for the powder slush molding die of the present invention, the screw feeder has an angle θ in the range of 3 to 15 ° when the angle θ formed by the longitudinal direction and the horizontal direction of the screw feeder is set. It is preferable that the value is set to the inside value and a downward slope is provided on the blast material transporting portion side.
With this configuration, the transfer of the blast material by the screw feeder can be performed satisfactorily without clogging or the like.

FIG. 1A is a side view provided for schematically explaining the cleaning device for the powder slush molding die of the present invention when viewed from the side, and FIG. 1B is the powder slush molding of the present invention. It is a top view which is provided for schematic explanation when the cleaning apparatus of a metal mold is seen from the upper surface direction. FIG. 2A is a side view provided for explaining how the molding die to be cleaned is attached to and detached from the powder slash molding die cleaning device of the present invention, and FIG. 2B is a top view. be. FIG. 3 (a) is a front view provided for schematically explaining the powder slash molding die cleaning device of the present invention when viewed from the front, and FIG. 3 (b) is shown in FIG. 3 (a). It is a figure provided for demonstrating the structural example of a bucket elevator when viewed from the R direction of. 4 (a) to 4 (b) are examples of synchronization means, respectively, and are views provided for explaining how the blast material is sent to the bucket elevator by controlling the rotation of the screw feeder. 5 (a) to 5 (b) are other examples of the synchronization means, respectively, and are views provided for explaining how the blast material is sent to the bucket elevator by the hopper. FIG. 6A is a diagram provided for explaining a form in which the cleaning booth is provided with an opening for exposing the screw feeder, and FIG. 6B is a circular recovery hole in the opening for exposing the screw feeder. The figure provided for explaining the form provided with the protective member having the screw feeder, and FIG. 6C describes the form provided with the protective member having a grid-like recovery hole in the opening for exposing the screw feeder. It is a figure provided for doing. FIG. 7A is a diagram provided for explaining an example in which the static elimination air supply unit is provided near the screw feeder, and FIG. 7B is an example in which the static elimination air supply unit is provided on the inner wall of the cleaning booth. FIG. 7 (c) is a diagram provided for the purpose of explaining an example in which the screw feeder is provided at an angle θ with respect to the horizontal direction L. 8 (a) to 8 (b) are magnified photographs of a coconut shell as a blast material by an optical microscope, FIG. 8 (a) has a magnification of 50 times, and FIG. 8 (b) has a magnification of 50 times. Is 240 times. FIG. 9 is a diagram provided for explaining a conventional blast cleaning device. FIG. 10 is a diagram provided for explaining another conventional blast cleaning device.

[First Embodiment]
In the first embodiment, as shown in FIG. 1, a mold support portion 11 to which the molding mold 31 to be cleaned can be attached and detached, a cleaning booth 13 which becomes a closed space when cleaning the molding mold 31, and cleaning are performed. It is provided in the booth 13 and includes a blast material injection unit 15 for injecting the blast material 35 into the molding die 31.
Further, the blast material recovery unit 17 provided at the lower end portion of the cleaning booth 13 in the vertical direction and used for cleaning is horizontally transferred, and the blast material 35 collected by the blast material recovery unit 17 is injected with the blast material. A blast material transport unit 19 for sending to the unit 15 is provided.
Further, the blast material recovery unit 17 includes a screw feeder 17a that horizontally feeds the blast material 35 that has reached the blast material recovery unit 17.
Further, the blast material transport unit 19 includes a bucket elevator 19a that receives the blast material 35 sent by the screw feeder 17a and sends it to the blast material injection unit 15.
Then, when the bucket 19x of the bucket elevator 19a faces the blast material discharge port 17b of the screw feeder 17a, the synchronization means 20 (specifically, the control unit) that delivers the blast material 35 from the screw feeder 17a to the bucket 19x. 21 is a cleaning device 10 for a powder slash molding die 31, which includes a sensor and other members (details will be described later).

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings as appropriate. In addition, the devices used, shapes, dimensions, materials, etc. described in the following description are preferable examples within the scope of the present invention, and each figure used in the description is shown schematically to the extent that the present invention can be understood. It's just that. Then, in each of the figures used for the description, the same components may be designated with the same reference numerals and the description thereof may be omitted. Therefore, the present invention is not limited to the following embodiments without any particular reason.

1. 1. Mold support portion The mold support portion 11 can be attached to and detached from the molding mold 31 to be cleaned, and is preferably formed of, for example, a metal frame. Since it is preferable that the mold support portion 11 also functions as a part of the sealing wall of the cleaning booth 13, a portion that functions as the sealing wall of the cleaning booth 13 is provided as the sealing wall. It is preferable to provide a portion for attaching / detaching the molding die 31 in the functional portion.
Further, it is preferable that the mold support portion 11 has a configuration in which the rotation shaft R in FIG. 1 is the center of rotation and the mold support portion 11 can be rotated by a motor across the operator 33 side and the cleaning booth 13 side.
2 (a) to 2 (b) show a state in which the worker 33 rotates the mold support portion 11 toward the worker 33 side and removes the molding mold 31 from the mold support portion 11.
That is, after the molding die 31 has been cleaned by the cleaning device 10, the operator 33 can move the molding die 31 to the operator 33 side by operating the switch of the control unit 21.
Then, the worker 33 removes the moved molding mold 31 from the mold support portion 11, attaches the molding mold 31 to be cleaned to the mold support portion 11, and then molds the molding mold 31 on the cleaning booth 13 side. The mold 31 can be moved.

2. Cleaning booth As shown in FIG. 1, the cleaning booth 13 constitutes a closed space for cleaning when the molding die 31 is cleaned. The cleaning booth 13 includes a mold support portion 11 and a first inclined plate 13a and a second inclined plate 13b that are in contact with the mold support portion 11 during mold cleaning and seal the front side of the cleaning device 10. , It is preferable that the cleaning device 10 is composed of a third inclined plate 13c that forms a closed space on the rear side.
The first inclined plate 13a and the second inclined plate 13b are used when the molding mold 31 is attached to the mold support portion 11 and when the molding mold 31 is removed from the mold support portion 11, respectively. In the above, it is preferable to have a structure that is folded inside the cleaning device 10 to release the sealed state of the cleaning booth 13. However, it is preferable that the third inclined plate 13c is arranged so as to be inclined so as to descend toward the lower end side in the vertical direction of the cleaning booth 13.
Further, during the cleaning work, the second inclined plate 13b is inclined so as to descend toward the lower end side in the vertical direction of the cleaning booth 13, and the cleaning is performed between the second inclined plate 13b and the third inclined plate 13c. It is preferable to arrange the device 10 so as to form a substantially V-shaped structure when viewed from the side. The angle formed by the V-shape of the substantially V-shaped structure is preferably, for example, 30 to 90 °, and more preferably 45 to 70 °.
The reason for this is that the blast material 35 that has slipped down and the residue that has fallen can be efficiently collected in the blast material recovery unit 17.

In order to satisfy the above-mentioned operation requirements of the first inclined plate 13a and the second inclined plate 13b, the first inclined plate 13a and the second inclined plate 13b may be configured to perform folding and extending operations. preferable. Therefore, it is preferable that the above-mentioned folding and extending operation of the first inclined plate 13a is performed by the cylinder 13d, and the above-mentioned folding and extending operation of the second inclined plate 13b is performed by the cylinder 13e. Further, it is preferable that each of the first to third inclined plates is made of a metal plate.
The reason for this is that it is possible to effectively prevent the blast material 35 from being hit and damaged when the blast treatment is performed, and it is possible to prevent static electricity from being generated in the blast material 35.

3. 3. Blast material injection unit (1) Main configuration As shown in FIG. 1, the blast material injection unit 15 has a main configuration in which the blast material 35 is placed in the cleaning portion of the molding die 31 to be cleaned in the cleaning booth 13. It is to be sprayed. The blast material injection unit 15 is preferably capable of accelerating the blast material at a high speed by compressed air generated by a compressor or the like and injecting the blast material onto the surface to be cleaned. Moreover, it is preferable to install an injection nozzle at the tip of the arm of the multi-axis robot, preferably the 6-axis robot, so that the injection direction can be arbitrarily changed. The blast material is a reusable blast material obtained by the blast material recovery unit 17 and the blast material transfer unit 19, which will be described later, and a blast material that is newly replenished.

(2) Blast material As the blast material, it is preferable to use a blast material having a value within the range of the new Mohs hardness of 2.0 to 6.0. Further, it is preferable to use a blast material having an average particle size in the range of 150 to 2000 μm.
For example, spherical alumina, polygonal melamine, polygonal walnut shell, polygonal coconut shell and the like can be used.
In particular, in the case of a polygonal coconut shell, the new Mohs hardness has a value of 4.0 or more, so that it is possible to effectively remove the residue of the mold while suppressing damage to the mold.
Then, as shown in the enlarged views of the optical microscope in FIGS. 8 (a) to 8 (b), if the coconut shell is crushed to a predetermined size, the corners remain, which is also preferable for transfer by a screw feeder described later. ..

4. Blast material recovery unit (1) Main configuration As shown in FIG. 1, the blast material recovery unit 17 is provided at the lower end portion of the cleaning booth 13 in the vertical direction as the main configuration, and the blast material 35 used for cleaning. Is for collecting from the washing booth 13 and transferring it in the horizontal direction. In particular, the blast material recovery unit 17 according to this application is a screw feeder 17a for horizontally feeding the blast material 35 used for cleaning, which has fallen in the cleaning booth 13 and / or has slid down the inner wall of the cleaning booth 13. It is a configuration including.
Further, it is preferable that the inner wall surface of the blast material recovery unit 17 has a cylindrical shape, and the inner diameter is 0.2 to 10 mm larger than the outer diameter of the spiral blade of the screw feeder 17a. That is, it is preferable that the inner diameter is in the range of 40 to 300 mm.
The reason for this is that by setting the inner diameter, the dropped blast material 35 can be efficiently transferred in cooperation with the screw feeder. That is, the blast material 35 can be stably held and transferred between the spiral blades without hindering the rotation of the screw feeder 17a.
The material of the blast material recovery unit 17 is preferably made of a metal such as iron, stainless steel, or aluminum because it has high durability and does not easily accumulate static electricity.
Further, it is preferable that an air suction device (not particularly shown) is further provided on the blast material discharge port 17b side of the blast material recovery unit 17.
The reason for this is that by sucking air in addition to the transfer of the screw feeder 17a, not only the blast material 35 that has fallen but also the blast material around the opening, which will be described later, is drawn in, and more efficient recovery is possible. Because it becomes.
Further, it is preferable that the blast material recovery unit 17 is further provided with a vibration generator (not shown in particular).
The reason for this is that the blast material 35 and the like that have been compacted can be recovered while being loosened inside the blast material recovery unit 17.

(2) Opening The blast material recovery section preferably includes an opening 23 for exposing the screw feeder 17a, as shown in FIG. 6A. That is, it is preferable to provide an opening 23 that opens the cleaning booth 13 side of the screw feeder.
The reason for this is that when the cleaning booth 13 side of the screw feeder 17a is opened, the blast material 35 that falls from the cleaning booth 13 to the blast material recovery unit 17 side can be efficiently dropped onto the screw feeder 17a. ..
Further, it is preferable that the second inclined plate 13b and the third inclined plate 13c are terminated on each side of the screw feeder 17a and connected to the peripheral wall 17b of the screw feeder 17a.
The reason for this is that the blast material 35 used for cleaning the molding die 31 can reach the screw feeder 17a without a shield.

5. Screw feeder (1) Main configuration As shown in FIG. 1, the screw feeder 17a has, as a main configuration, moving the blast material 35, which has fallen to the blast material recovery unit 17, to the blast material transport unit 19 side along the horizontal direction. It is for transportation.
Specifically, the rotation of the screw feeder 17a causes the spiral blade to apparently move, and the apparent movement of the spiral blade causes the blast material 35 held between the spiral blades to be transferred.
The horizontal direction referred to here includes a case where the angle θ is tilted in the vertical direction with respect to the horizontal direction (details will be described later).

(2) Form As the form of the screw feeder, a generally used one can be used, and examples of the shaft form include a single-axis type, a coreless type, a two-axis type, and a multi-axis type. Examples of the spiral blade include a screw blade, a ribbon blade type, and a donut blade. In particular, a single shaft type screw blade is preferable.
The reason for this is that with such a configuration, the blast material sliding down from the washing booth can be collected in a narrow range, and can be reliably held and transferred to the space between the spiral blades.

(3) Angle It is preferable that the screw feeder is provided parallel to the horizontal direction or is provided so as to descend at an angle θ toward the blast material conveying portion side.
The reason for this is that with such a configuration, the blast material can be satisfactorily transported by the screw feeder.
In particular, as shown in FIG. 7C, it is preferable that the screw feeder 17a is provided at an angle θ with respect to the horizontal direction L. Specifically, the angle θ is preferably in the range of 3 to 15 °, and more preferably in the range of 5 to 10 °.
The reason for this is that if the angle θ is too large, the design of the cleaning device 10 is hindered, and if the angle θ is too small, the effect of facilitating the feeding of the blast material 35 is small.

(4) Length / Outer Diameter of Spiral Blade The length of the screw feeder in the longitudinal direction is preferably larger than the horizontal size of the cleaning booth, and is preferably 1000 to 3500 mm. As described above, the outer diameter of the spiral blade of the screw feeder is preferably made according to the inner diameter of the blast material recovery portion, that is, it is preferably 30 to 310 mm.
The reason for this is that with such a length, it can be efficiently transferred from the lower end of the cleaning booth to the bucket elevator, and with such an outer diameter, the rotation of the screw feeder is not hindered and the blast material is not caught. This is because stable transfer is possible.
Further, the spiral blade of the screw feeder may be coaxial with a different diameter, and it is also preferable to increase the outer diameter of the spiral blade as it gets closer to the bucket elevator.
The reason for this is that with such a configuration, the blast material carried from the upstream fills the space between the spiral blades on the downstream side, and the blast material accumulates on the bucket elevator side of the cleaning booth. This is because it can be prevented from being stored.

(5) Pitch of spiral blade The diameter of the screw feeder and the pitch of the spiral blade are preferably determined in consideration of the particle size of the blast material used. When, for example, a polygonal coconut shell is used as the blast material, the pitch of the spiral blade of the screw feeder is preferably 5 to 300 mm, more preferably 10 to 200 mm, still more preferably 15 to 100 mm.
The reason for this is that the pitch of the spiral blades makes it easy to transfer and collect the coconut shells in a predetermined direction while efficiently holding the coconut shells in the space between the spiral blades.
Further, it is preferable that the pitch of the spiral blade of the screw feeder gradually increases toward the blast material conveying portion.
The reason for this is that such a configuration prevents the space between the spiral blades on the downstream side from being filled with the blast material carried from the upstream side, and also prevents biting at the blast material discharge port. This is because it can be prevented.

5. Protective member (1) Main configuration As shown in FIGS. 6 (b) to 6 (c), the protective member 25 has a main configuration for separating the cleaning booth 13 and the blast material recovery unit 17 on the upper surface of the opening 23. belongs to.
For example, if a relatively large foreign matter reaches the screw feeder 17a, it may hinder the transportation of the blast material 35, or if it is hard, it may damage the screw feeder 17a. Therefore, it is preferable to provide protective members 25 and 27 for protecting the screw feeder 17a on the cleaning booth 13 side of the screw feeder 17a.
The protective members 25 and 27 are preferably made of the same material as the blast material recovery unit 17, and are preferably made of a metal such as iron, stainless steel, or aluminum because of their excellent durability and high conductivity. ..
Further, it is preferable that the screw feeder 17a is arranged at a position separated from the outer diameter of the spiral blade by 0.1 to 10 mm.
With such a structure, the dropped blast material 35 can be efficiently transferred in cooperation with the screw feeder 17a. That is, the blast material 35 can be stably held and transferred between the spiral blades without hindering the rotation of the screw feeder 17a.

(2) Recovery holes Further, as shown in FIGS. 6 (b) to 6 (c), the protective members 25 and 27 are blast materials so as not to interfere with dropping the blast material 35 into the blast material recovery section 17. It is preferable to have a plurality of recovery holes 25a and 27a, which are sufficiently large with respect to the size of 35 and having a size capable of blocking the passage of large foreign substances, along the horizontal direction.
The reason for this. This is because the blast material accumulated in the cleaning booth can be efficiently dropped during the transfer by the screw feeder.

(3) Size The size of the recovery hole is preferably 10 to 50 times the average particle size of the blast material, and is smaller than the pitch of the spiral blade of the screw feeder, which will be described later. Is preferable. Specifically, in the case of a circular shape, 1.5 mm to 100 mmφ is preferable, and 15 mm to 25 mmφ is more preferable. Further, in the case of a quadrangle, 1.5 mm square to 100 mm square is preferable, and 15 mm square to 25 mm square is more preferable.
The reason for this is that with such a size, the blast material that has fallen can easily pass through and can also serve as a protective member.
Therefore, for example, as shown in FIG. 6B, the shape of the recovery hole 25a is preferably circular or elliptical, and along the horizontal direction, linear, zigzag, saw blade, rectangular wavy, etc. Alternatively, it is preferable that they are arranged in a wavy shape.
The size of the recovery hole 25a may be such that at least the size along the horizontal direction is within a predetermined range, and the spiral blade of the screw feeder 17a in the direction perpendicular to the horizontal direction. It may be larger than the pitch of.
Therefore, as another example, as shown in FIG. 6C, it is also preferable that the shape of the recovery holes 27a is a rectangular grid shape. In this case, the pitch of the spiral blade of the screw feeder 17a is smaller in the horizontal direction, but it may be longer than the pitch of the spiral blade in the direction perpendicular to the horizontal direction.

(4) Pitch The pitch of the recovery holes is preferably equal to or less than the pitch of the spiral blade of the screw feeder. That is, it is preferably less than 5 to 300 mm according to the pitch of the spiral blade.
The reason for this is that at least one recovery hole will be located between the spiral blades and the blast material can be reliably guided to the region between the spiral blades. When the recovery holes are staggered or not arranged in a straight line, the distance along the horizontal direction of each recovery hole may be smaller than the pitch of the spiral blade.

6. Blast material transport unit (1) Main configuration As shown in FIG. 1, the blast material transport unit 19 sends the blast material 35 recovered by the blast material recovery unit 17 to the blast material injection unit 15 as the main configuration. .. In particular, the blast material transport unit 19 according to this application includes a bucket elevator 19a and a synchronization means 20 described later.
The bucket elevator 19a receives the blast material 35 sent by the screw feeder 17a and sends it to the blast material injection unit 15. 3 (a) to 3 (b), particularly FIG. 3 (b), show a structural example of the bucket elevator 19a. The bucket elevator 19a includes a plurality of buckets 19x, a belt 19c in which these buckets are connected at predetermined intervals, a motor 19d for driving the belt 19c, and a pulley 19e for assisting the movement of the belt 19c. After moving the recovered blast material 35 in the vertical direction, it is discharged at the discharge port (connection path with the blast material injection unit 15) at the top.

(2) Shape The shape of the bucket elevator when viewed along the horizontal direction in the blast material transport section may be any shape depending on the positional relationship between the cleaning booth and the connection path of the blast material injection section.
For example, an I-shape that transports vertically up and down, an oblique I-shape that transports vertically up and down toward the cyclone, an L-shape that combines vertical and horizontal transport, and an inverted L-shape. It is preferably at least one of a U-shape and a Z-shape.
In particular, if it is an inverted L-shape or Z-shape, the outlet of the bucket elevator can be brought directly above the cyclone, preventing it from scattering to the surroundings and remaining in the middle when transferring the blast material. Can be more preferred.

7. Cyclone Cyclone selectively separates and recovers only blasting materials having a particle size equal to or larger than a predetermined value by wind power from the recovered blasting materials and residues.
That is, since the blast material and the residue having a particle size less than a predetermined value are light in weight, they are recovered from the upper part of the cyclone to the dust box by wind power.
On the other hand, if the blast material has a particle size of a predetermined value or more, it falls without being affected by the wind power due to its weight, and is separated and recovered. Then, the separated and recovered blast material having a particle size of a predetermined value or more is sent to the blast material injection unit by a pressure feeding means or the like (not shown) and reused in cleaning the molding die.
Therefore, it is preferable that the cyclone is connected to the discharge port at the top of the bucket elevator, and the output end of the cyclone is connected to the blast material injection portion.
The reason for this is that it becomes easy to prevent something other than the blast material, such as a residue, from being sent to the blast material injection portion and reattaching to the molding die.
When the blast material transport section is further provided with a cyclone, the connection path with the blast material injection section is connected to the output end of the cyclone.

8. Synchronization means (1) Main configuration As shown in FIGS. 4A and 5A, the synchronization means 20 has, as the main configuration, a bucket 19x of the bucket elevator 19a and a blast material discharge port of the blast material recovery unit 17. It detects that it faces 17b, rotates the screw feeder 17a, and controls the delivery of the blast material 35 to the bucket 19x.
Further, it is detected that the delivered blast material 35 and the residue on the molded surface have entered the bucket 19x in a predetermined amount, the rotation of the screw feeder 17a is stopped, and the plurality of buckets 19x of the bucket elevator 19a are moved. Control is performed to send a predetermined number of elevators (1 to half of the bucket elevators 19a).
Therefore, the synchronization means 20 can have an arbitrary configuration as long as the above object can be achieved. For example, for a microcomputer or sequencer built in the control unit 21 provided in the cleaning device 10, a position detection sensor 21a provided at an appropriate position in the bucket elevator 19a, and a screw feeder 17a controlled by a control signal from the microcomputer or sequencer. It is preferable that the configuration includes the motor 21b (see FIG. 4B) or the hopper 21c (see FIG. 5).

(2) Specific example 1
For example, as shown in FIG. 4B, the synchronization means 20 uses a proximity sensor as the position detection sensor 21a and a motor 21b provided with an encoder for detecting the number of rotations in the control unit 21. It is preferable to have a control circuit that responds to the signal of the encoder.
The reason for this is to prevent the blast material 35 remaining in the blast material discharge port 17b from falling without entering the bucket 19x, and from the blast material recovery unit 17 to the bucket 19x of the blast material transfer unit 19. This is because the blast material 35 can be delivered more easily and reliably.
In this case, the proximity sensor as the position detection sensor 21a detects that the bucket 19x has reached the fixed position. When the control unit 21 detects the detection signal, the control unit 21 rotates the motor 21b by a predetermined rotation speed and sends the blast material on the screw feeder 17a to the bucket 19x. The screw feeder 17a stops when the rotation of a predetermined rotation speed is completed. After that, the control unit 21 sends the bucket elevators 19a by a predetermined number of buckets (1 to half of the bucket elevators 19a).
Then, as shown in FIG. 3, the bucket 19x that has come to the position of the cyclone 19f reverses and discharges the blast material 35 in the bucket 19x to the cyclone 19f. By repeating such an operation, the blast material 35 used for cleaning is conveyed and finally sent to the blast material injection unit 15 for reuse.

(3) Specific example 2
Further, a configuration example of another synchronization means 20 will be described with reference to FIGS. 5A to 5B. For example, another synchronization means 20 is preferably composed of a position detection sensor 21a for detecting the position of the bucket 19x, a hopper 21c, and a sequencer or a microcomputer in the control unit 21. Then, it is preferable that the hopper 21c opens and closes the blast material discharge port 17b according to the instruction of the control unit 21.
In this case, the proximity sensor as the position detection sensor 21a detects that the bucket 19x has reached the fixed position. When the control unit 21 detects the detection signal, the control unit 21 controls the hopper 21c so as to open the blast material discharge port 17b of the hopper 21c (state of FIG. 5A). Then, the blast material is discharged from the screw feeder 17a side into the bucket 19x. The screw feeder 17a may be operated in conjunction with the movement of the hopper 21c, or the screw feeder 17a may be operated constantly or at regular intervals.
The reason for this is that it is possible to prevent the spilled blast material 35 from falling after the screw feeder 17a is stopped. Further, even when the bucket 19x is not in the blast material discharge port 17b, it is not necessary to stop the screw feeder 17a, and the blast material 35 can be recovered more efficiently.

9. Static electricity elimination air supply unit As shown in FIGS. 7A to 7B, the static electricity elimination air supply unit 29 is for blowing static electricity-removing air to the screw feeder 17a and / or the inner wall of the cleaning booth 13. be.
Further, the spraying position may be a desired region of the cleaning device 10, and of course, the spraying position may be sprayed on the molding die 31 to be cleaned.
For example, the example shown in FIG. 7A is an example in which the static elimination air supply unit 29 is provided at the end of the screw feeder 17a on the side opposite to the bucket elevator 19a side.
In this case, it is preferable that the static elimination air supply unit 29 is provided with the static elimination air supply unit 29 so that the static elimination air flows along the longitudinal direction of the screw feeder 17a and toward the bucket elevator 19a side. When the screw feeder 17a itself is made of metal, it is more preferable to keep it in contact with the ground.
Further, the example shown in FIG. 7B is an example in which the static elimination air supply unit 29 is provided above each of the second inclined plate 13b and the third inclined plate 13c.
In this case, it is preferable to provide the static elimination air supply unit 29 so that the static elimination air flows from the upper side to the lower side of the inclined plate.
The reason for this configuration is that if the static electricity elimination air supply unit 29 is provided and the static electricity elimination air is blown, the influence of static electricity can be reduced and the blast material 35 can be easily recovered.
More specifically, the blast material 35 injected from the blast material injection unit 15 may be charged when it comes into contact with the molding die 31 to be cleaned. Then, the charged blast material 35 adheres to the inner wall of the cleaning booth 13 and the screw feeder 17a, making it difficult to move. Therefore, the generation of static electricity is suppressed by the static electricity elimination air, and the blast material is recovered more efficiently.

[Second Embodiment]
The second embodiment is a method for reusing the blast material using the powder slash molding die cleaning device 10 of the first embodiment shown in FIGS. 1 (a) to 1 (b), and is the following step. This is a method for reusing a blast material using a cleaning device 10 for a powder slash molding die 31, which sequentially includes (a) to (e).
(A) Inside the cleaning booth 13, the blast material 35 is sprayed from the blast material injection unit 15 onto the powder slash molding mold 31, and the blast treatment is performed to carry out the powder slash molding mold 31. Step of removing the residue on the molded surface (b) The sprayed blast material 35 and the residue on the molded surface (hereinafter, may be referred to as a blast material or the like) are referred to as the first inclined plate 13a and the second inclined plate 13a. Step (c) In the step (c) synchronization means 20 of sliding down the inclined plate 13b along the slope and collecting it in the blast material recovery unit 17, the bucket 19x of the blast material transport unit 19 faces the blast material discharge port 17b. Step (d) Synchronizing means 20 of rotating the screw feeder 17a to transfer the recovered blast material 35 and the like horizontally to the bucket 19x from the blast material discharge port 17b when it is detected. When it is detected that the delivered blast material 35 or the like has entered a predetermined amount in the bucket 19x, the rotation of the screw feeder 17a is stopped and the plurality of buckets 19x of the bucket elevator 19a are predetermined. Step of sending only a few pieces (1 to half of the bucket elevator) (e) When the bucket 19x reaches the discharge port at the top of the bucket elevator 19, the blast material 35 etc. in the bucket 19x is used as the blast material. Step of discharging to the path to the injection part The cleaning device 10 used in the method of reusing the blast material 35 using the cleaning device 10 of the powder slash molding die 31 described in the second embodiment is the first. Since the content can be the same as that described in the embodiment, the description here will be omitted.

1. 1. Preliminary Step Prior to carrying out the step (a), it is preferable to first prepare a molding die to be attached to the cleaning device for the powder slash molding die.
For example, it is a Ni electric mold, which is a molding die used when molding a three-dimensional molded product by powder slush molding using resin powder made of TPU or TPO or vinyl chloride powder as a main raw material.
Next, it is preferable to fix the molding die on the mold support portion held in a substantially horizontal state.
Then, the molding mold fixed on the mold support portion is rotated about the horizontal axis by a rotation mechanism having a horizontal axis provided along the lateral direction of the mold support portion, and a predetermined angle is obtained. (For example, it is preferably held at 10 to 80 °, more preferably 30 to 50 ° with respect to the vertical direction).
Further, at the end of the previous step, it is preferable that the first inclined plate provided above the mold support portion operates so as to close the cleaning booth in synchronization with the movement of the mold support portion. ..

2. Step (a)
In the step (a), the blasting material is sprayed from the blasting material injection part onto the powder slash molding die inside the cleaning booth, and the blasting process is carried out to perform the blasting treatment on the molding surface of the molding die. This is a step of removing the residue.
That is, as a blasting process, a blasting material having a predetermined moth hardness is sprayed onto a molding surface of a molding die held at a predetermined angle using a blasting material injection unit (robot arm) to form a molding die. This is a step of removing the residue adhering to the molding surface of the mold.
By carrying out in this manner, even if the molding die is large and heavy, the molding die can be held at an angle that facilitates the work, and the work efficiency can be significantly improved. Residues can be effectively removed by effectively utilizing the collision energy of the blast material and the grinding effect of the blast material.

Further, it is preferable that the air volume at the time of blowing the blast material is a value in the range of 100 to 10,000 liters / minute.
The reason for this is that when the air volume is less than 100 liters / minute, the collision energy when the blast material collides with the molding die is small, and the residue adhering to the mold surface cannot be effectively removed. Because there is.
On the other hand, if the air volume exceeds 10,000 liters / minute, when the blast material collides with the molding mold, the surface of the mold is excessively polished or the blast material is easily destroyed and reused. This is because it may not be possible.
Therefore, it is more preferable that the air volume at the time of blowing the blast material is in the range of 300 to 5,000 liters / minute, and further preferably in the range of 500 to 3,000 liters / minute. ..

3. 3. Step (b)
In the step (b), in the blast material recovery unit, the sprayed blast material or the like is slid down along the slopes of the first inclined plate and the second inclined plate, and further along the third inclined plate, and the second This is a step of collecting the material in the blast material recovery unit in the gap provided below the inclined plate of No. 1 and the third inclined plate.

4. Step (c)
In step (c), when the synchronous means detects that the bucket of the blast material transport unit faces the blast material discharge port, the recovered blast material or the like is horizontally rotated by rotating the screw feeder. This is the process of transferring and delivering from the blast material outlet to the bucket.
That is, for example, a proximity sensor detects that the bucket is at the blast material discharge port and transmits a detection signal to the sequencer.
Then, the sequencer is a step of transmitting the rotation signal to the motor for the screw feeder for a predetermined time (for example, 10 to 600 seconds) from the time when the detection signal is received.
Due to the rotation of the screw feeder, the blast material, etc. held in the space between the spiral blades is transferred horizontally along with the apparent movement of the spiral blades, and the blast material discharge port that is vacant at the lower part downstream of the screw feeder. This is the process of discharging the blast material and the like.

5. Step (d)
In step (d), when the synchronous means detects that the delivered blast material or the like has entered a predetermined amount in the bucket, the rotation of the screw feeder is stopped and a plurality of buckets of the bucket elevator are operated. , Each is a process of sending a predetermined number of pieces.
That is, for example, when the amount of the delivered blast material or the like is set to a predetermined amount within the predetermined time set in the step (c), the rotation of the screw feeder is stopped when the predetermined time elapses.
Then, for each of the plurality of buckets connected by the chain of the bucket elevator, for example, only one bucket is sent.

6. Process (e)
The step (e) is a step of discharging the blast material or the like in the bucket to the path to the blast material injection portion when the bucket reaches the discharge port at the top of the bucket elevator.
That is, for example, when the bucket to which the blast material or the like is delivered reaches the discharge port at the top of the bucket elevator in the step (d), the bucket is turned upside down and the blast material or the like inside is sent to the blast material injection section. On the other hand, it is a process of spitting out.
After that, by returning to the step (a) and repeating the steps (a) to (e), the blast material can be recovered and reused better than before even with a simple configuration.
At this time, it is preferable to provide a cyclone in the discharge port of the bucket elevator and the path to the blast material injection portion in order to separate the blast material and the residue on the molded surface.
This cyclone is for separating the mixed particles into a plurality of types as a result of changing the subsequent path depending on the size of the particle size and the weight of the particles by the force of the wind.
Therefore, through the cyclone, the reusable blast material is separated into non-reusable materials such as the residue on the molded surface and the blast material that is too small and crushed, and only the reusable blast material is used in the next step. It is preferable to send.

Using the following various blast materials, the cleaning effect of the molding die, that is, the effect of removing residues and the ease of recovery of the used blast material were investigated, and the results are shown in Table 1. .. The present invention is not limited to the following examples without any particular reason.

[Example 1]
Using a powder slush molding die (300 mm x 450 mm x 1.0 mm) made of Ni electrocast metal and finely processed for a grain pattern with a depth of 0.1 mm, mainly thermoplastic urethane elastomer (TPU) A three-dimensional molded product (instrument panel member) having a predetermined shape was powder slush molded as a raw material. After using this powder slush molding 50 times repeatedly, the depth of the grain pattern formed on the mold surface was measured using a laser displacement meter LC (manufactured by KEYENCE) as a laser type measuring device. The depth of the grain pattern in the molded product was 0.03 mm.
Next, this molding die is attached to a cleaning device, and a blast material containing a polygonal coconut shell having an edge portion (new Mohs hardness: 4.0, average particle size: 1200 μm) as a main component is used. It was blasted by spraying under the condition of air flow rate of 500 liters / minute. Next, the molding die after the blast treatment was subjected to the following evaluation as the powder slash molding die of Example 1.

(1) Detergency (evaluation 1)
The blasted powder slash molding die was observed for the residue adhering to the mold surface using an optical microscope, and the detergency of the molding die was evaluated according to the following criteria.
⊚: No residue is confirmed.
◯: Some residue is confirmed.
Δ: A considerable amount of residue is confirmed.
X: No residue has been removed.

(2) Decorativeness of three-dimensional molded product (evaluation 2)
Using a blasted powder slash molding die, a three-dimensional molded product having a predetermined shape was powder slash molded using a thermoplastic urethane elastomer (TPU) as a main raw material. Next, using the above-mentioned laser type measuring device, the depth of the grain pattern in the three-dimensional molded product was measured at 10 points, and the average value was calculated. It is preferable that the grain pattern is deep.
⊚: The average value of the depth of the grain pattern is 0.20 mm or more.
◯: The average value of the depth of the grain pattern is 0.15 mm or more.
Δ: The average value of the depth of the grain pattern is 0.10 mm or more.
X: The average value of the depth of the grain pattern is less than 0.10 mm.

(3) Mold damage (evaluation 3)
The blasted powder slash molding die was used again 50 times in the powder slash molding (hereinafter, may be simply referred to as use) and then blasted. After repeating this 10 times, the molding surface (cleaned surface) of the molding mold is observed using an optical microscope, and the mold damage (non-damage) by the blasting treatment is evaluated according to the following criteria. bottom.
⊚: No damage was observed on the molded surface of the mold even after repeating the use and blasting treatment 10 times.
◯: After repeating the use and blasting treatment 8 to 10 times, damage was observed on the molded surface of the mold.
Δ: After repeating the use and blasting treatment 5 to 7 times, damage was observed on the molding surface of the mold.
X: Damage was observed on the molded surface of the mold by the time the use and blasting treatment were repeated 4 times.

Next, as an evaluation of the recoverability and reusability of the blast material, first, the molding die was reattached, a protective member was provided at the opening of the blast material recovery part, and then 30 kg of coconut shell (hereinafter referred to as the blast material). ) Was sprayed.
Next, the recovery holes of the protective member had a circular shape, a pitch of 50 mm, and a diameter of 20 mm, and were dropped into a cylindrical blast material recovery section (inner diameter: 160 mm) for recovery.
Next, the screw feeder of the single-screw blade (spiral blade pitch: 100 mm, spiral blade outer diameter: 150 mm) was rotated at 60 rpm to transfer the blast material in the horizontal direction.
Next, the transferred blast material was transported to the cyclone by a bucket elevator, and only the blast material having a particle size equal to or larger than a predetermined value was selectively separated and recovered by wind power.
Then, the blast material separated and recovered by the cyclone was returned to the blast material injection section 20 times.

(4) Recoverability of blast material (evaluation 4)
After repeating spraying, recovery, and separation of 30 kg of blast material 20 times, the blast material remaining in the washing booth or the blast material recovery section was visually evaluated according to the following criteria.
⊚: Almost no residual blast material was observed in both the cleaning booth and the blast material recovery section.
◯: A small amount of small-diameter blast material remained in the cleaning booth or the blast material recovery section, but it could be removed only by simple cleaning such as air blow.
Δ: Residual blast material having a small diameter was found in the cleaning booth or the blast material recovery part, and could be removed by cleaning such as sweeping out.
X: Residual blast material having a large diameter was found in the cleaning booth or the blast material recovery section, and complicated cleaning such as disassembly and cleaning was required.

(5) Reusability of blast material (evaluation 5)
The amount of blast material that could be reused after 20 times of spraying, recovery, and separation of the blast material was evaluated.
⊚: The amount of blast material that could be reused was 25 kg or more.
◯: The amount of blast material that could be reused was less than 20 to 25 kg.
Δ: The amount of blast material that could be reused was less than 15 to 20 kg.
X: The amount of blast material that could be reused was less than 15 kg.

[Example 2]
In Example 2, instead of the blasting material in Example 1, the average particle size of the coconut shell was set to 900 μm. Evaluation was carried out.

[Example 3]
In Example 3, instead of the blast material in Example 1, a blast material (new Mohs hardness: 3.0, polygonal shape) made of walnut shells having an average particle size of 1200 μm was used. Similarly, the molding die was blasted and then evaluated.

[Example 4]
In Example 4, the evaluation was carried out in the same manner as in Example 1, except that the recovery holes of the protective member were square, 90 mm pitch, and 40 mm square.

[Example 5]
In Example 5, the evaluation was carried out in the same manner as in Example 1 except that the protective member was not provided.

[Comparative Example 1]
In Comparative Example 1, the evaluation was carried out in the same manner as in Example 1, except that the blast material recovery unit and the blast material transfer unit were of a suction method.

[Comparative Example 2]
In Comparative Example 2, the evaluation was carried out in the same manner as in Example 1 except that the blast material transport portion was a suction method.

[Comparative Example 3]
In Comparative Example 3, evaluation was carried out in the same manner as in Example 1 except that the blast material recovery unit was a suction method.

According to the cleaning device for the powder slush molding die of the present invention, the used blast material can be collected and conveyed by a screw feeder, a bucket elevator, or a synchronous means for synchronizing the two, so that the blast material can be sucked. Compared with the conventional device that has been recovered, the blast material can be recovered and transported better. Moreover, it has become possible to maintain the advantage of a cleaning device using a blast material, that is, the residue adhering to the molding die can be easily and quickly removed without damaging the molding die. .. Therefore, the cleaning apparatus of the present invention is preferable for cleaning molds for molded products in various industries that require a grain pattern or the like, and has high industrial applicability.

10: Cleaning device 11: Mold support 13: Cleaning booth 15: Blast material injection unit 17: Blast material recovery unit 17a: Screw feeder 17b: Blast material discharge port 19: Blast material transfer unit 19a: Bucket elevator 19x: Bucket 20 : Synchronization means 21: Control unit 21a: Position detection sensor 21b: Motor (for screw feeder)
21c: Hopper 23: Opening 25, 27: Protective member 25a, 27a: Recovery hole 29: Static elimination air supply part 31: Molding mold 33: Blast material

Claims (9)

A mold support part to which the molding mold to be cleaned can be attached and detached, a cleaning booth that becomes a closed space when cleaning the molding mold, and a cleaning booth provided in the cleaning booth to inject a blast material into the molding mold. The blast material injection unit to be used, the blast material recovery unit provided at the lower end portion in the vertical direction of the cleaning booth, and the blast material used in the cleaning are transferred in the horizontal direction, and the blast material collected by the blast material recovery unit. A powder slush molding die cleaning device including a blast material transporting unit for sending to the blasting material injection unit.
The blast material recovery unit includes a screw feeder that horizontally feeds the blast material that has reached the blast material recovery unit.
The blast material transport unit includes a bucket elevator that receives the blast material sent by the screw feeder and sends it to the blast material injection unit.
A powder slash comprising a synchronization means for delivering blast material from the screw feeder to the bucket when the bucket of the bucket elevator faces the blast material discharge port of the blast material recovery unit. Cleaning equipment for molding dies. The synchronization means includes a sensor for detecting that the bucket is in the blast material discharge port, and a control mechanism for rotating the screw feeder in response to a signal detected by the sensor. Item 2. The cleaning device for a mold for powder slash molding according to item 1. The synchronization means according to claim 1, wherein the synchronization means includes a sensor that detects that the bucket is in the blast material discharge port, and a hopper that opens and closes in response to a signal detected by the sensor. Powder slash molding mold cleaning device. The powder slash molding die according to any one of claims 1 to 3, wherein the blast material recovery unit is provided with an opening on the cleaning booth side of the screw feeder to expose the screw feeder. Mold cleaning device. The blast material recovery unit is provided with a protective member on the upper surface of the opening for separating the cleaning booth and the blast material recovery unit, and the protective member is provided in the cleaning booth along the horizontal direction. The cleaning device for a powder slash molding die according to claim 4, further comprising a plurality of recovery holes for taking the deposited blast material into the blast material recovery unit. The cleaning device for a powder slash molding die according to claim 5, wherein the pitch of the collection holes is equal to or less than the pitch of the spiral blade of the screw feeder. The cleaning of the powder slash molding die according to any one of claims 1 to 6, wherein the pitch of the spiral blade of the screw feeder is gradually widened toward the blast material conveying portion. Device. The invention according to any one of claims 1 to 7, wherein the screw feeder, the inner wall of the cleaning booth, or one of them is provided with a static electricity elimination air supply unit for blowing static electricity elimination air to remove static electricity. The above-mentioned powder slash molding mold cleaning device. When the angle θ formed by the longitudinal direction and the horizontal direction of the screw feeder is set, the screw feeder has a value within the range of 3 to 15 ° and is inclined downward toward the blast material transport portion side. The device for cleaning a mold for powder slash molding according to any one of claims 1 to 8, wherein the device is provided.

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