JP4089901B2 - Material supply device for two injection devices - Google Patents

Description

  The present invention relates to a material supply device in two injection devices arranged side by side on a machine base.

Conventionally, for the purpose of multilayer or two-color molding, two injection devices are arranged side by side on a machine base, and molding is performed by operating the injection devices simultaneously or individually.
JP-A-2001-88164.

  The injection device of the normal structure is equipped with a molding material hopper device for each injection molding, and the molding material is individually fed from a material tank, container, etc. by a material supply pipe piped for each hopper device. Yes. When the resin used for molding is different, such as in multi-layer or two-color molding, there is no particular problem even if the material is supplied for each of the two injection devices, but the product has a plurality of molded products with the same shape. In a precision molded product (for example, DVD) completed by pasting, it is required to perform molding by simultaneously supplying the same resin with the same history (dry) even if it is the same resin.

  The present invention has been conceived in order to solve the above-described conventional problems. The object of the present invention is to provide a single hopper device for two injection devices and to supply a molding material from the hopper device to the injection device. By being configured so as to be able to supply, it is an object to provide a material supply device that enables injection molding of molded products having the same injection capacity or different injection capacities with the same history of resin by using two injection devices.

According to the above-described object, the present invention provides a first supply pipe of a metal pipe erected on one of two injection devices arranged side by side on a machine base, and is connected to the lower end of the hopper body at the upper end of the first supply pipe . a hopper fixedly provided on the injection device by connecting the material chamber, an upper end connected to the bottom surface of the first supply pipe and parallel base and material chamber, a second supply pipe flexible branching to the other injection unit, a molding material and a detector for automatically feeding the detection to the hopper a material level attached to the side of the material chamber above the bifurcation of the second supply pipe, is that.

  In the above configuration, since the hopper device is shared and the material can be supplied to the two injection devices at the same time, the two injection devices can simultaneously mold a molded product made of the resin having the same history. In addition, every time the material level is detected by the detector provided above the branch portion of the second supply pipe, the molding material is automatically fed to the hopper device, so that the material supply to both supply pipes can be made simultaneously without any difference. You can do it. Therefore, even when moldings having different injection capacities are simultaneously molded, there is no difference in the hopper device from the case of moldings having the same injection capacity, so that it is not necessary to perform special control for material transportation.

  Further, since the branch of the second supply pipe only needs to be provided side by side with the first supply pipe on the bottom surface of the material chamber, the material supply apparatus becomes lower in cost than the normal case where the hopper apparatus is individually provided, and the hopper apparatus and the material are separated. Since there are fewer material transport pipes and transport equipment with the supplier, the equipment cost and maintenance cost for material transport can be reduced. Furthermore, since the second supply pipe is made flexible to provide flexibility, even if a slight misalignment occurs when the two injection devices are operated synchronously, the influence will be a burden on the branch part. There is nothing, and even those that share a hopper device can sufficiently withstand long-term use. Further, since the injection device having the hopper device can be operated independently by removing the second supply pipe, there is also the convenience that the injection device can be used in two ways according to molding.

  In the figure, reference numerals 1 and 1 'denote two injection devices having the same structure arranged in parallel on the machine base 2 so as to be capable of nozzle touch. The injection drive source 3, the metering drive source 4 and the nozzle touch drive source 5 are electrically driven. It consists of an electric type with a normal structure that employs a servo motor.

  This injection device 1, 1 ′ includes an injection member 8 inserted between tie bars 9, 9 provided between the front support 6 and the rear support 7 so as to be able to advance and retract. An apparatus main body in which a heating block 12 having an injection screw interior is mounted together with a supply block 11 having a molding material supply port 10 formed in the upper surface on the front surface of the body 6, an outer side of the apparatus main body, and a fixing plate 13 of the mold clamping apparatus. The metering drive source 3 on the injection member 8, the injection drive source 4 on the rear support 5, and the nozzle touch on the side of the front support 4. The drive sources 5 of the device 14 are respectively installed so as to operate without interfering with each other.

  The front support 6 and the rear support 7 are vertically fixed to a seat plate 15, and front and rear guide members 16 attached to both sides of the lower surface of the seat plate 15 are placed and fixed on the upper surface of the machine base. The two injection devices 1 and 1 'are advanced or retracted individually or simultaneously with respect to the fixed plate 13 by the nozzle touch device 14 by being slidably fitted to rails 18 laid two by two on the upper surface of the base 17. It is arranged in parallel on the upper surface of the machine base 2 so as to be free.

  Reference numeral 20 denotes a material supply device. A hopper body 21 in which a molding material feed pipe 22 and a volatile component suction pipe 23 are connected to each other up and down with an internal filter as a boundary, and a cylindrical shape continuously provided at the lower end of the hopper body 21. The material chamber 24 and the material level a detector 25 provided on the side of the material chamber 24, a hopper device, a metal pipe first supply pipe 26 and a flexible pipe second supply pipe 27.

  The first supply pipe 26 is erected at the supply port 10 of the injection apparatus 1, and the bottom surface of the material chamber 24 is connected to the upper end of the first supply pipe 26 to fix the hopper device on the injection apparatus. The second supply pipe 27 has a lower end connected to the supply port 10 of the other injection apparatus 1 and is connected to the bottom surface of the material chamber 24 with the upper end aligned with the first supply pipe 26. 1 so that the molding material can be supplied from the material chamber 24 simultaneously with the first supply pipe 26. The detector 25 is attached to the side surface of the material chamber 54 above both supply pipes at the branch portion of the second supply pipe 27. A shutter 28 is provided at the connection port of the second supply pipe 27.

  In such a material supply device 20, the molding material is fed into the hopper body 21 from a feed pipe 22 connected to a material tank, a container or the like. This material feeding is automatically started when the detector 25 detects the material level a, and a preset amount is fed into the hopper body 21 and stored. The molding material is divided into both supply pipes 26 and 27 from the material chamber 24 and is simultaneously supplied to the two injection devices 1 and 1 '. Further, the inside of the hopper device is always sucked under reduced pressure by the suction tube 23, thereby maintaining the molding material in a dry state. Therefore, the simultaneously molded molded products are made of the resin having the same history, and molding is not limited to molded products having the same injection capacity, and molded products having different injection capacities can be molded.

  In the two injection devices 1 and 1 'sharing this hopper device, both nozzle touch devices 4 are controlled to operate synchronously and simultaneously move forward and backward at the same speed, but a slight position at the time of starting and stopping Deviation is difficult to avoid, and a difference in movement between the injection devices may occur due to a difference in movement resistance, and the position may be shifted back and forth. However, the load received by the second supply pipe 27 due to the positional shift is absorbed by being flexible, and there is no burden on the branch portion of the material supply apparatus 20.

  In addition, it is possible to operate the injection device 1 'with a fixed hopper device. The single operation is performed by closing the connecting port by the shutter 28, stopping the material supply to the second supply pipe, and removing the second supply pipe 27. The removal of the second supply pipe 27 is confirmed by detecting the presence / absence of the connection part of the second supply pipe 26 by a detector 29 such as a proximity switch installed on the supply block. Become.

It is a top view of two injection apparatuses provided with the material supply apparatus of this invention. It is a front view of the 2 injection | pouring apparatus which shows a material supply apparatus longitudinally. It is a front view at the time of single operation of one injection device similarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Injection apparatus 2 Machine stand 6 Front support body 10 Supply port 11 Supply block 20 Material supply apparatus 21 Hopper main body 22 Feed pipe 23 Suction pipe 24 Material chamber 25 Material level detector 26 1st supply pipe 27 2nd supply pipe 28 Stopper 29 Second supply pipe detector

Claims (1)

Injection by connecting a first supply pipe of a metal pipe standing on one of two injection devices arranged side by side on the machine base, and a material chamber connected to the lower end of the hopper body at the upper end of the first supply pipe a hopper fixedly provided on the device, the upper first and supply pipe and parallel base and connected to the bottom surface of the material chamber, and a second supply pipe flexible branching to the other injection apparatus, branching of the second supply pipe material supply unit of the injection apparatus 2 group, characterized in that comprising a detector for automatically feeding a molding material to detect and hopper materials level attached to the side of the material chamber above the site.

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