JPS63170016A - Control of carrying-out of product in injection molding equipment - Google Patents

Abstract

PURPOSE:To prevent collision of a product from an upstream side with a product taken out of injection molding equipment which is on a downstream side, by a method wherein when entering of the product into a predetermined limit point on the upstream side falling within a carrying-out range of the product is detected, the carrying-out of the product to a carrying conveyor of the product is suspended during a predetermined period of time. CONSTITUTION:Phototubes 17 are provided on a somewhat upstream side of a limit point 16 on the upstream side falling within a carrying-out range 15 of a product by placing a mixed flow conveyor 3 between the phototubes 17, and detecting that the product to be carried from the upstream side if entered into a carrying range 15 of the product. The carrying-out range 15 of the product is decided by setting a preset value of a timer obtained to the timer by making use of a length of the product, a conveyor speed of the mixed flow conveyor 3 and a predetermined safety factor. The preset value of the timer is sent to a local computor 8 from a host computor 7. In a control board 10 which has received a command from a local computor 8 suspends an action of a carrying conveyor 2 of the product corresponding to a taking-out machine 6 of the product under conveyance, Then an action of the carrying conveyor 2 of the product more upstream side than the carrying conveyor 2 of the product is controlled and suspended.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a product delivery control system for transporting products taken out from a plurality of injection molding equipment, and is applicable to an unmanned factory suitable for high-mix, low-volume production. be done.

(Prior Art) Conventionally, in a system that centrally controls a plurality of injection molding equipment, a mixed flow conveyor is used to convey products taken out from each injection molding equipment in a mixed flow.

(Problem to be Solved by the Invention) However, since the mixed flow conveyor sequentially conveys various products taken out from a plurality of injection molding equipment, when the downstream injection molding equipment carries out products, the upstream In some cases, products conveyed from the conveyor and products conveyed downstream collide with each other, resulting in scratches or falling from the mixed flow conveyor, resulting in defective products.

(Means for Solving the Problems) The product unloading control system in the injection molding equipment of the present invention includes a plurality of product unloading machines provided corresponding to each of the product unloading machines that take out the products molded by the injection molding machine from the mold. A series of product conveyor conveyors are connected, and each product conveyor has a
Means is provided for detecting when a product flowing from another product conveyor conveyor disposed upstream of the product conveyor has entered an upstream limit point of a predetermined product conveyance range, and the upstream limit point For a predetermined period of time after detection of the product entering the product transport conveyor, the product removal from the product unloading machine corresponding to the product transport conveyor is stopped.

The product delivery range is an arbitrarily selected range within the product delivery range determined by the characteristics of the product removal machine.

(Function) It is detected that a product transported from a product transport conveyor upstream of the product transport conveyor has entered the upstream limit point of a predetermined product transport range provided corresponding to the product transport conveyor. Then, for a predetermined period of time from the time of this detection, the delivery of the product to this product conveyor is stopped, and collision with the product flowing from the upstream side is prevented.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a product discharge control system in injection molding equipment according to the present invention. The product delivery control system of this example is a system that determines the timing at which products taken out from a plurality of injection molding equipment are delivered to the product conveyor 2 provided corresponding to each injection molding equipment.

The mixed flow conveyor 3 is one in which the product transport conveyors 2 are connected in series, and the products of the same type or different types taken out from a plurality of injection molding equipments are mixed into the mixed flow conveyor 3.
The paper is sequentially transported from the upstream 4, which is the base point in the transport direction, to the downstream 5, which is the end point. As is well known, the injection molding equipment is composed of an injection molding machine 1, a product take-out machine 6, etc., and each injection molding machine 1 is arranged at regular intervals along the longitudinal direction of the mixed flow conveyor 3, and The product molded by the molding machine 1 is taken out from the mold by the product take-out machine 6,
The product is carried out to the corresponding product conveyor 2 from a direction substantially perpendicular to the longitudinal direction of the product conveyor 2 .

At this time, the product is carried out to a product carry-out range 15 within a certain product carry-out range 14 regulated by the characteristics of the product take-out machine 6 (see FIG. 2).

The injection molding ia 1, the product conveyor 2, and the product take-out machine 6 are provided with control panels 9.10.11 for controlling their respective drives. It is under general control (group management control) based on instructions from the local computer 8 that has received support. Of course, these control panels 9, 10, 11 can also be individually controlled separately from the commands from the local computer 8.

In FIG. 2, a photocell 17 is placed slightly upstream of the upstream limit point 1G of the product carrying range 15 with the mixed flow conhair 3 in between.
is provided, and the products transported from upstream are transported to product transport range 1.
5 is detected. This phototube 17 is provided on the product conveyor 2 other than the most upstream product conveyor 2.

Specifically, the product carrying range 15 is calculated using the following formula ( It is determined by setting the value obtained in step 11 (timer setting value) in a timer (not shown).

In this example, this timer setting value is included as one of the product type standard conditions sent from the host computer 7 to the local computer 8.

Note that the counting operation of the timer is performed only when the product conveyor 2 corresponding to the product take-out machine 6 to be delivered is rotating, thereby ensuring that the product delivery range 15 is secured.

By the way, in detecting the passing of a product using the phototube 17 as described above, if there is a hollow part 19, that is, a light transmitting part, when viewed from the side of the mixed flow conveyor 3, such as the product 18 shown in FIG. Since the phototube 17 is once turned on even when the product 18 is passing, there is a possibility that the product 18 will be mistakenly judged as having passed. As a countermeasure for this, in this example, if the OFF time of the phototube 17 is shorter than the maximum length transit time of the product 18 (see Figure 2) conveyed on the mixed flow conveyor 3, the same product 18 is passed. This prevents the above-mentioned erroneous determination.

Next, an example of control for carrying out the product taken out from the product taking out machine 6 will be explained with reference to FIG. 2.

The unloading control in this example is calculated by the host computer 7 and the local computer 8 based on information such as the type and size of the product molded by each injection molding machine 1, for example,
Commands are controlled by a control panel 11 for the product take-out machine 6 and a control panel 10 for the mixed flow conveyor 3. Then, it is determined based on the output result of the phototube 17 that the product being conveyed from the product conveyor 2 on the upstream side of the product conveyor conveyor 2 has passed the upstream limit point 16 of the product conveyance range 15. The timer measures the time required for the longest product among the products conveyed on the mixed flow conveyor 3 to pass through the product unloading range 15, and the unloading from the product unloading machine 6 is stopped during this time. Ru. Furthermore, in this example, the control panel 10 receiving a command from the local computer 8 temporarily stops the operation of the product transport conveyor 2 corresponding to the product take-out machine 6 currently being carried out, and also temporarily stops the operation of the product transport conveyor 2 corresponding to the product take-out machine 6 currently being transported. The operation of the product conveyor 2 is temporarily stopped to reliably prevent collisions between products flowing from the upstream side and products to be carried out.

In the above embodiment, the waiting time for unloading in each injection molding equipment is such that after the phototube 17 detects the product, the longest product among the products conveyed on the mixed flow conveyor 3 passes through the product unloading range 15. However, since the length and order of the various products to be conveyed on the mixed flow conveyor 3 are stored in a data file in the host computer 7, the time required for the products to be conveyed is It is also possible to set an optimal waiting time for each size.

(Effects of the Invention) As described above, according to the present invention, the products taken out from the injection molding equipment located downstream of the mixed flow conveyor are
There is no collision with products flowing from the upstream side.

[Brief explanation of the drawing]

FIG. 1 is a block diagram illustrating the overall configuration of a product discharge control system in an injection molding facility according to the present invention, and FIG. 2 is a diagram illustrating an example of setting a product discharge range. 1... Injection molding machine 2... Product conveyor 3
...Mixed flow conveyor 7...Host computer 8
... Local computer 17 ... Phototube patent applicant Hiroshi 1) Kaoru, representative of Sekisui Chemical Co., Ltd.

Claims (1)

[Claims] 1) A plurality of product transport conveyors provided corresponding to each product take-out machine for taking out a product molded by an injection molding machine from a mold are connected in series, and each of the product transport conveyors is provided with means for detecting when a product flowing from another product transport conveyor disposed upstream of the product transport conveyor enters the upstream limit point of a predetermined product transport range; A product discharge control system for an injection molding facility, characterized in that product discharge from a product take-out machine corresponding to the product conveyor is stopped for a predetermined period of time after detection of entry into a side limit point. 2) When the product is transferred from the product take-out machine to the product conveyor, the operation of the product conveyor and the product conveyor upstream of the product conveyor is controlled to be temporarily stopped. Product unloading control system in the injection molding equipment described in Section 2.