JPH0351132Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an apparatus for transporting a pulverized reduced resin material and a virgin resin material to a hopper of a plastic molding machine while mixing them by suction air transport.

[Prior Art] Apparatuses for supplying plastic molding materials by pneumatic conveyance are broadly classified into pressure type and suction type.Recently, various suction type transport and supply apparatuses have been developed. ing.

One of them is a transportation supply device as shown in FIG. 2, which was proposed in Japanese Utility Model Application No. 59-123019.

That is, in this case, a pipe 102 is connected to each material supply tank 100 via a supply tool 101 such as a rotary valve, an outside air introduction part 103 is provided in the middle of the pipe 102, and the pipe 102 is
is connected to the material transport pipe 106 on the upstream side leading to the hopper 105 of each molding machine 104, and a filter 108 and the vacuum pump 1 are connected to the intake pipe 107 on the downstream side leading from each hopper 105.
09 is provided. When the vacuum pump 109 is driven, the negative pressure causes the outside air introduction part 1 to
Outside air flows into the material transport pipe 106 from 03,
The material supplied from the material supply tank 100 to the material transport conduit 106 is transported to each hopper 105 by the flowing outside air.

[Problems to be solved by the invention] However, in the conventional device as described above, before the air containing fine dust inside the hopper 105 is discharged to the outside by the vacuum pump 109, the dust is removed through the filter 108. However, since it is impossible to completely remove small particles of fine powder, there is a problem in that a considerable amount of fine powder is inevitably scattered around.

In addition, as in this conventional device, the external introduction section 10
If outside air is introduced into the material transport pipe from 3, there is a problem that when the outside air is humid, such as on a rainy day, the resin material that has been dried with a dryer will absorb moisture again during transportation. In particular, this problem becomes a problem that cannot be ignored when the resin material is highly hygroscopic.

Furthermore, in such a conventional device, the material supply tank 100 and the supply tool 101 cannot be easily separated, so when replacing the material, the tank 1
There is also the problem that the material remaining in the container must be completely removed and replaced with another material, and this refilling work is troublesome.

In addition, this conventional equipment does not have a built-in pulverizer that pulverizes the sprue runner into a reducing material, so when using a resin material that is a mixture of a new virgin material and a reducing material, it is necessary to There is also the problem of having to grind the reducing material in a grinder.

The present invention has been devised to solve these problems all at once.

[Means for Solving the Problems] That is, the present invention has been made in view of the above-mentioned circumstances, and the present invention has been made in view of the above-mentioned circumstances. A blower is provided to reduce the pressure of air, and a material transport pipe connected to the material suction port of the hopper is connected to the blower via an air supply pipe to form a closed loop material transport pipe for mixed transport of materials for plastic molding. In the supply device, the material transport pipe is a base having a conveyor wheel and a connecting short pipe with both ends open, communicating with a rotary feeder connected to an outlet of a material storage tank. A transportable pulverized and reduced material metering and supply unit is provided with a material storage tank on the table that stores the waste of resin molding materials such as sprue runners equipped with a crusher, and a material storage tank that has a conveyor wheel. A material storage tank in which new molding resin materials of different types are stored in advance on a base having a connecting short pipe with both ends open and communicated with a rotary feeder connected to the discharge port of the rotary feeder. It has two connection parts that connect in series and detachably a plurality of conveyable virgin material metering and supply units equipped with a pulverized reduced material metering and supplying unit. The open ends of the connecting short pipe are airtightly and removably connected by a one-touch insertion/removal device, and one virgin material metering and supplying unit selected from the plurality of virgin material metering and supplying units is connected to the other side of the connection. The present invention is characterized in that both open ends of the connecting short pipe of the virgin material metering and supplying unit are connected in an airtight manner and removably by a one-touch insertion/removal device.

[Operation of the device] According to the device of the present invention having such a configuration, the open end of the connecting short pipe provided on the base of the pulverized and reduced material metering and supplying unit is connected to one of the connecting portions formed in the material transport pipe. A one-touch insertion/removal device is used, and the other side of the connection part is connected to a connecting short pipe provided on the base of one virgin material metering and supplying unit selected for resin molding from among a plurality of virgin material metering and supplying units. By connecting the openings at both ends with the one-touch insertion/removal device, the hopper, blower,
The air supply pipe and the material transport pipe are collectively formed into a closed loop transport pipe.

After forming the closed-loop transport conduit in this way, if the blower is driven, the inside of the hopper of the molding machine is degassed and depressurized by the blower.
The air in the material transport pipe is sucked into the hopper, and the deaerated air from the hopper is returned to the material transport pipe via the air supply pipe and circulates through the closed loop transport pipe.

Therefore, after forming the air flow in the closed-loop transport line in this way, the rotary feeder of the pulverized reduced material metering unit and the rotary feeder of the virgin material metering unit are connected to the previously set By rotating it according to the mixing ratio, the two resin materials supplied from the pulverized and reduced material metering and supplying unit and the virgin material metering and supplying unit are mixed by the air flow in the closed loop transportation pipe. Since the material is sucked and transported into the hopper, a mixer is not required, and the mixture of virgin material and pulverized reduced material is efficiently supplied into the hopper of the molding machine.

In addition, in the device of the present invention, each material metering and supply unit can be connected to and removed from the transport pipe using a one-touch insertion/removal type connector, and when connected to the transport pipe, the discharge port of each rotary feeder is Since it is airtightly connected in series to the material transport pipe, the air containing dust inside the hopper, which is deaerated by the blower, circulates within the closed loop transport pipe and is not released to the outside. The scattering of dust to the surrounding area is almost eliminated, and a sanitary work environment can be maintained.

Furthermore, since the air circulates in the closed-loop transport pipe in this way, the dew point within the pipe becomes almost constant, and there is no problem of the resin material re-absorbing moisture while being transported through the material transport pipe.

Further, according to the device of the present invention, the material transport pipe includes at least one pulverized reduced material metering and supplying unit having a rotary feeder and a conveyor wheel, and a virgin material metering and supplying unit having a rotary feeder and a conveyor wheel as well. The metering and supplying unit can be transported and connected detachably using the one-touch connector, so even when the mixed material needs to be replaced depending on the molded product, the necessary material metering and supplying unit can be easily connected to the metering and supplying unit. All you have to do is remove it from the transport pipe and replace it with another one, which is extremely convenient and reduces the effort required to replace the material.

[Example] Hereinafter, the apparatus for mixing and transporting plastic molding materials of the present invention will be described in detail with reference to Examples.

FIG. 1 is an explanatory diagram of an embodiment of the present invention apparatus. As shown in the figure, a deaeration pipe 4 is connected to a deaeration port 3 of a hopper 2 of a molding machine 1, and a material suction port 5 of the hopper 2 is connected to a deaeration pipe 4. A material transport pipe 6 is connected thereto.

This hopper 2 is an airtight hopper sealed with a lid, and a cylindrical filter 7 is provided inside the hopper. The material sucked in through the material suction port 5 is temporarily stored inside the cylindrical filter 7 and sent to the molding machine 1 through the material discharge port 9 at the lower end. Air passes through the cylindrical filter 7 and is degassed from the deaeration port 3.

At the end of the degassing pipe 4, a blower 10 for deaerating and reducing the pressure inside the hopper 2 and a bag filter 1 for removing dust are installed.
1 is provided, and the blower 10 and the material transport pipe 6 are connected by an air supply pipe 12 to form a closed loop transport pipe as a whole.

The pulverized reduced material metering and supplying unit A and the virgin material metering and supplying unit B both have bases 14 and 17 with conveyor wheels 20 provided with rotary feeders 13 and 16 as measuring mechanisms, and are capable of metering and supplying the pulverized reduced material. A material storage tank 15 equipped with a crusher 15a is mounted on the top of the base 14 of the unit A. Waste resin molding materials such as sprues and runners are stored in this storage tank 15, and new resin material (virgin resin material) is stored on the top of the base 17 of the other virgin material metering and supplying unit B. Material storage tank 1 containing
It is equipped with 8.

In addition, these material metering and supply units A and B
The structure is such that the material discharge ports of the material storage tanks 15, 18 are communicated with the rotary leaf feeders 13, 16 through connecting short pipes 21, 22 which are open at both ends provided below the respective bases 14, 17. The openings at both ends of these connecting short pipes 21 and 22 are connected to a material transport pipe 6 formed by dividing the material transport pipe 6 by means of one-touch insertion/removal type connectors 8 and 8. The two connecting parts 6a, 6a, 6b,
6b so that it can be detachably connected.

In the figure, one side of the one-touch insertion/removal type connector 8 is connected to the connecting short pipes 21, 2 of each material metering and supply unit A, B.
2, and the other one is provided at the open end of the connection parts 6a, 6a, 6b, 6b of the transport pipe 6.The one provided on each material metering and supply unit A, B side is used for transport Connecting parts 6a, 6a, 6 of pipe line 6
The structure is such that the connection is made by inserting into the one provided at the open end of b, 6b. In addition, numeral 19 in the figure indicates a discharge port through which the reducing material overflows and is discharged when the supply amount of the crushed pulverized reducing material exceeds the supply amount of the virgin material and exceeds a predetermined mixing ratio. be.

Material metering and supply units A and B with such a structure
A plurality of units are prepared in advance, and connecting short pipes 21 and 22 provided below the respective bases 14 and 17 are used.
Both ends of the opening can be exchangeably connected and disconnected to each of the two connection parts 6a, 6a, 6b, and 6b formed in the transport pipe 6 using one-touch connection and disconnection type connectors 8, 8, respectively. The base is equipped with different types of crushers and material storage tanks containing different types of virgin pellets.

Therefore, when manufacturing plastic molded products, an appropriate combination of material metering and supply units A and B containing pulverized reduced material and virgin material are selected according to the molded product to be manufactured, and the transport pipes are They are connected to the connecting portions 6a, 6a and 6b, 6b of No. 6 in exchange.

In the embodiment, these different types of material metering and supply units A and B are referred to as A', B', and B', respectively.
In particular, regarding the virgin material metering and supply unit, B' indicates a unit with a drying function, and B'' indicates a unit with a dehumidifying function.

In the plastic molding material mixed transportation and supply apparatus configured as described above, each of the rotary feeders 13 and 16 of the pulverized reduced material metering and supplying unit A and the virgin material metering and supplying unit B is controlled to adjust the mixing ratio of the reduced resin material. If the unit is rotated accordingly, the pulverized material (waste of resin molding materials such as sprue and runners) in the pulverized and reduced material metering supply unit A is
and fresh molding material from virgin material metering unit B are transferred to rotary feeders 13 and 13, respectively.
16 measures a predetermined amount and continuously supplies it to the material transport pipe 6. At this time, the inside of the hopper 2 is degassed and depressurized by the blower 10, and the air in the material transport pipe 6 is sucked into the hopper 2. Therefore, the two resin materials supplied into the material transport pipe 6 are mixed while being sucked and transported to the hopper 2 by this air flow, and then passed through the cylindrical filter 7.
After being temporarily stored inside, it is sent to the molding machine 1 from the lower material discharge port 9.

Then, the air sucked into the hopper 2 passes through the cylindrical filter 7 by the suction force of the blower 10, passes through the deaeration pipe 4, and is removed by the bag filter 11 without being released to the outside. The material is returned to the material transport pipe 6 via the air supply pipe 12, sucked into the hopper 2 again, and then sent out to the material transport pipe 6 via the air supply pipe 12, after which it circulates within the closed loop transport pipe. .

[Effect] As can be understood from the above explanation, according to the device of the present invention, the air containing dust inside the hopper, which has been deaerated by the blower, is circulated within the closed-loop transport pipe without being released to the outside. The scattering of dust to the surrounding area, which was a problem in the past, is almost eliminated, and a sanitary work environment can be maintained.

In addition, since the air is circulated in the closed-loop transportation pipeline without introducing outside air in this way, the dew point in the circulation pipeline remains almost constant, and the resin material reabsorbs moisture while being transported. Problems can also be resolved.

In addition, the pulverized reduced material metering and supplying unit A and the virgin material metering and supplying unit B are both airtightly connected in series to the closed-loop transport pipeline by one-touch insertion/removal type connectors so that they can be exchanged with other units. Therefore, if it is necessary to replace the resin material depending on the molded product, all you have to do is remove the material metering and supply units A and B, transport them, and replace them with another one, eliminating the hassle of refilling the resin material. There is no need to do this, and material replacement work is significantly reduced.

Such a device of the present invention is particularly useful for mixed transportation of resin materials mixed with waste resin such as sprues and runners, where mixing accuracy is not very important.
It is extremely practical.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. Explanation of the symbols: A, A'... pulverized reduced material metering and feeding unit, B, B', B''... virgin material metering and feeding unit, 1... molding machine, 2... hopper,
3... Deaeration port, 4... Deaeration pipe line, 5... Material suction port, 6... Material transport pipe line, 6a, 6b... Connection section, 10... Blower, 8... One-touch insertion/removal type connector, 13, 16...rotary feeder,
20, 20... Conveyance wheel, 21, 22... Connecting short pipe.

Claims (1)

[Claims for Utility Model Registration] A blower 10 is provided at the end of the deaeration pipe line 4 connected to the deaeration port 3 of the airtight hopper 2 of the molding machine 1 to degas and reduce the pressure inside the hopper. A mixed transport and supply device for plastic molding materials, comprising a material transport pipe 6 connected to the material suction port 5 of the hopper 2 via a passage 12 to form a closed loop transport pipe, the material transport The pipe line 6 has a conveyor wheel 20, and a sprue runner or the like with a crusher 15a attached on a base 14 having a connecting short pipe 21 with both ends open and communicating with the discharge port of the rotary feeder 13 along the way. The material discharge port of the material storage tank 15 containing waste resin molding material is connected to the rotary feeder 13.
It has a transportable pulverized reduction material metering and supplying unit A that is connected to the
The material discharge port of the material storage tank 18, which has previously stored a new molding resin material of a different type, is placed on the base 17 having a connecting short pipe 22 with both ends open and communicated with the discharge port of No. 6. It has two connection parts 6a, 6a and 6b, 6b that connect in series and detachably a plurality of conveyable virgin material metering and supplying units B, B', B'' which are provided in communication with the feeder 16 and are detachable and replaceable. One of the connection parts 6a, 6a and 6b, 6b is connected to both open ends of the connection short pipe 21 of the pulverized and reduced material metering and supply unit A using one-touch insertion/removal type connectors 8, 8. The connectors 8, 8 are connected in a gas-tight and removable manner, and the other of the connectors 8, 8 is provided with one virgin material metering and feeding unit selected from the plurality of virgin material metering and feeding units B, B', B''. This mixed transport and supply device for plastic molding materials is constructed so that both open ends of the connecting short pipe 22 of B are removably connected in an airtight state by one-touch insertion/removal type connectors 8, 8.