JPH09156760A - Separating method and device for product such as molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device by which separation of an unnecessary part and defective products are reliably performed at low cost in molding such as injection molding or processing such as punching. SOLUTION: A sieve surface capable of being freely opened and closed, for separating an unnecessary part such as a sprue and a runner is provided on a hopper 1, and articles to be supplied from the hopper 1 are distributed to a production chute 4 and an unnecessary part chute (a runner chute 5) from a seesaw-type movable chute 3. At this time, opening and closing of the sieve surface and the distribution to the runner chutes 4, 5 are performed in synchronism with the opening and closing cycle of a metal mold of a molding machine. Moreover, when a signal of abnormal molding state of the molding machine is detected, the articles supplied from the hopper 1 are automatically controlled so as to be dropped to the only unnecessary article chute 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention efficiently separates from a processed product a processed product and an unnecessary portion which are sent out from a molding process such as injection molding and a punching process and an unnecessary portion and a defective product. Method and device.

[0002]

2. Description of the Related Art In injection molding and the like, it is necessary to efficiently separate unnecessary parts such as runners from molded products. Further, for example, a product defect occurs when the screw pressure at the time of injection is not appropriate, but such a defective product in the molding process must not be mixed into the product. these,
The removal of unnecessary parts and defective molded products has traditionally been done manually by the operator by hand.

For the purpose of reducing labor and improving production efficiency, a method using a robot (automatic take-out machine) and a method using a plurality of rotating drums provided with protrusions have been devised. In the method using a rotating drum, for example, two drums provided with spine-shaped or whisker-shaped protrusions abut in the same rotation direction, and one of the product placed on the surface of one rotating drum and the mixture of unnecessary parts is Only the unnecessary part caught on the protrusion of one rotating drum is sent to the other side of the other rotating drum.

However, in these methods, the equipment cost and the maintenance cost of the separating device are high, and the separation of the unnecessary portion is not always sufficient depending on the type of molded product. There is a problem that the cost is particularly high when the robot is used, and the separation is insufficient even by the separation using the rotating drum. In particular, there has been a problem in molding to obtain a large number of rod-shaped or small pieces.

[0005]

DISCLOSURE OF THE INVENTION The present invention is designed to separate unnecessary parts and defective products during molding such as injection molding.
An apparatus and method that can be reliably performed at low cost.

[0006]

In the method of separating products according to claim 1, in the step of separating the processed product and the unnecessary portion, which are sent together by the processing steps such as molding and punching, every time the processed product is supplied. , The screen surface is separated by the openable / closable screen means, and the processed product and unnecessary parts are sorted into the product chute and the unnecessary product chute by switching the falling path below the screen surface, and further, abnormalities such as processing defects in the processing process. When occurs, all the processed products including defective products supplied through the path switching means are sent to the unnecessary product chute side when the screen surface is opened.

In the product separating method of the second aspect, in the step of separating the processed product and the unnecessary portion which are sent together by the processing steps such as molding and punching, the unnecessary portion of the processed product is supplied to the supply portion of the processed product. In addition to providing a sieving means for separating the sieving surface that can be opened and closed, a switching operation is performed below the sieving surface in synchronization with the opening and closing of the sieving surface, so that the falling processed product and the unnecessary portion can be separated into a product chute and an unnecessary product chute. Each discharge chute is provided with a route switching means for allocating each, and every time a processed product or the like including an unnecessary portion is supplied, either the processed product or the unnecessary portion is dropped through the sieving means, and the corresponding one discharge chute is provided. Is sent to the side of the one discharge chute through the path switching means connected to, then the screen surface is opened and the path switching means is moved to the other side. A switching operation is performed on the side of the discharge chute, and the other one of the processed product or the unnecessary portion falling from the opening portion of the screen surface is sent to the side of the other discharge chute via the path switching means, and further the processing step. When an abnormality such as a processing failure occurs in, the automatic control based on the abnormality occurrence signal opens the sieve surface and switches the path switching means to the side of the unnecessary product chute to remove the defective product supplied. All of the processed products including the product are sent to the side of the unnecessary product chute.

With such a structure, the processed product and the unnecessary portion can be reliably separated by a simple mechanism, and
When a processing defect occurs, the processed product and the unnecessary portion can be entirely discharged to the unnecessary product chute without separating them.

In the product separating device of the third aspect, in the step of separating the processed product and the unnecessary portion, which are delivered together by the processing steps such as molding and punching, the unnecessary portion of the processed product is supplied to the supply portion of the processed product. And a sieving means that has an openable and closable sieve surface that separates and drops and that drops unnecessary portions by opening the sieving surface and a switching operation below the sieving means in synchronization with the opening and closing of the sieving surface. Then, the processed product and the unnecessary portion are switched to the product chute and the unnecessary product chute by switching the connection of the dropping path, respectively, and the rotary floor type or seesaw type path switching means, and the opening of the sieve surface and the path switching. And a synchronous drive means for driving the operation cycle in synchronization with the supply cycle of the processed product and the like. When an abnormality such as a defective work occurs, the abnormality signal is driven and controlled so that the screen surface is opened and the path switching means is switched to the unnecessary product chute side. It is characterized in that all the processed products including are sent to the side of the unnecessary product chute as unnecessary products.

According to a fourth aspect of the invention, in the apparatus for separating unnecessary parts or defective articles according to the second aspect, the opening and closing of the screen and the switching operation by the path switching means are driven by the same cylinder mechanism. It

With such a structure, the driving structure of the separating device becomes extremely simple, so that not only the operation and mounting of the separating device become simpler, but there are few malfunctions and almost no failures.

A separating apparatus according to a fifth aspect is the separating apparatus according to the third aspect for separating unnecessary parts or defective products, wherein the sieve surface is composed of rods arranged in a comb shape, and the rods arranged in the comb shape. Are arranged in a double-opening door shape that opens downward with the root portion of the comb teeth as a door shaft, and a rod extending from one of the door shafts and a rod extending from the other door shaft with the sieve surface closed. Are arranged alternately in the lateral direction of the bar.

With this structure, for example, the flat or rod-shaped molded product and the unnecessary portion having the protrusion (particularly the sprue) can be easily separated, and the unnecessary portion on the sieve surface can be easily discharged. Be seen.

[0014]

1 and 2 are schematic views showing the structure of a separation apparatus according to an embodiment of the present invention, FIG. 3 is a perspective view showing the appearance of the apparatus, and FIGS. FIG. 7 is a schematic diagram showing a state of operation, and FIG. 7 is a schematic diagram showing a state of driving by a cylinder.

(Basic Structure of Separating Apparatus) The basic structure of the separating apparatus according to the embodiment of the present invention will be described below with reference to FIGS. A plurality of straight bars (guide bars) 2 are arranged in a comb shape in a substantially square bottom opening 11 of the hopper 1 having a wide bottom. Here, the rotatable door shafts 21 and 24 arranged along the two opposite sides of the bottom opening 11 form the roots of the comb teeth, and the door composed of the comb-shaped straight rod 2 can be opened and closed downward. To do. When the door formed of the comb-shaped straight rods 2 is closed, the screen surface 20 is formed at a position to receive the bottom opening 11.

In the illustrated embodiment, a long rod 22 and a short rod 23 are alternately arranged at equal intervals on one door shaft 21 along one side of the bottom opening 11. It extends to almost reach the other door shaft 24, and the short rod 23 extends to a position slightly past the middle of the bottom opening 11. The other door shaft 2 along one of the opposite sides of the bottom opening 11
4, a short rod 25 is arranged only at a position to fill the space between the door shaft 24 and the shorter rod 23. Therefore,
Straight rod 2 extending from one door shaft 21 (here, long rod 2
2) and the straight rod 2 (here, short rod 25) extending from the other door shaft 24 are staggered with the comb-teeth door closed. That is, when the sieve surface 20 composed of the straight rods 2 is viewed from above, a region is formed in which the rods from both door shafts are alternately arranged in the lateral direction of the straight rods 2.

The long rod 22 and the short rod 23 and the short rod 25 arranged on one door shaft 21 are arranged in different steps. Therefore, the sieve mesh formed between the adjacent straight rods 2 is directed obliquely upward.

Here, the door of the straight rod 2 is removable, and a door having an appropriate sieve mesh or an array of the straight rod 2 is appropriately selected according to the shape of the object to be separated. In addition to the long rods 22 arranged on both door shafts, the straight rods 2 having no step difference, a curved rod may be used instead of the straight rods 2 in some cases.

A seesaw type movable chute 3 is arranged as a path switching means at a position for receiving the hopper 1. The pivot shaft 31 of the movable chute 3 is arranged so as to come to the axis of symmetry of the bottom opening 11, that is, directly below the center line between the door shafts 21 and 24.

At the position where the movable chute 3 is inclined, a product chute 4 and a runner chute 5 (unnecessary product chute), which are slide-like fixed chutes, are mounted on the rotary shaft 3.
1, they are arranged on the opposite sides, that is, on the side of the one door shaft 21 and on the side of the other door shaft 24, respectively. Here, all of the chutes 3, 4, 5 have a U-shaped cross section, and the movable chute 3 is fitted into the upper part of each of the fixed chutes 4, 5 by its rotation so as to be completely connected. It is configured.

The movable chute 3 is connected to the runner chute 5, and the long bar 22 is tilted to the same side with the comb-shaped straight bar 2 door open.
It is set so that it almost reaches the floor plate 32 of the.

The rotation of the door shafts 21 and 24 for opening and closing the sieving surface 20 and the rotation of the rotary shaft 31 of the movable chute 3 which is the path switching means are performed by the synchronous drive means described later.

(Operation of Separation Device) An operation mode of the separation device according to this embodiment will be described with reference to FIGS.

The molded product 6 is drawn in a triangle shape and the runner 71 is drawn in an H shape. At the center of the runner, a wedge-shaped sprue 72 is attached perpendicular to the H-shaped plane. The runner 71 and the molded product 6 are separated before being supplied to the hopper 1.

In FIG. 4, a sieve surface 20 composed of straight rods (guide bars) 2 arranged in a comb shape covers the bottom opening 11 of the hopper 1 from below, and the movable chute 3 is connected to the product chute 4. Is so inclined. Here, the runner 71 and the sprue 72 (hereinafter referred to as the runner portion 7), which are unnecessary portions, are supplied to the hopper 1 together with the molded product 6 which is a processed product, but in the embodiment illustrated in the figure, the runner portion is supplied. Only 7 rests on the sieve surface 20 and the molded product 6 passes between the straight bars 2.

Here, the small-piece planar or rod-shaped molded product 6 easily passes through the sieving surface 20 composed of the comb-shaped arrangement of the straight rods 2, but the runner portion 7 has a shape in which the runners 71 spread in a plane. Not only is it easy to get caught on the straight rod 2,
Since the sprue 72 is protruding, it cannot pass through the comb teeth of the straight rod 2. Further, since the straight rods 2 are alternately arranged in different steps, it is possible to smoothly pass through the small piece plane-shaped or rod-shaped molded product 6 while reliably catching the runner portion 7.

In FIG. 5, the door made of the straight rod 2 is opened, and the movable chute 3 is inclined so as to connect to the runner chute 5. At this point, the supply to the hopper 1 is stopped, and the runner portion 7 that has hit the straight rod 2 is discharged to the runner chute 5.

Since the screen surface 20 is composed of the straight rod 2,
When the door of the screen surface 20 is opened and inclined, the runner portion 7 slides down easily because there is no catch in the direction of the straight rod 2. In addition, since the straight rods 2 extend alternately from both door shafts 21 and 24, the distance between the straight rods 2 increases when the door is open, and the runner portion 7 sandwiched between the straight rods 2 is easy. Is discharged to. Further, since only the short rod 25 is arranged on the door shaft 24 on the runner chute 5 side, the door shaft 24
Even if the rotation angle of is not too large, the runner part 7
Does not interfere with the discharge of.

As described above, the unnecessary portion (runner portion 7) on the screen surface 20 is reliably discharged with a minimum amount of operation, and no step of scraping the screen surface is required.

FIG. 5 schematically shows how the separating apparatus 10 of this embodiment operates in synchronization with the opening and closing of the mold 8 of the molding machine.

(1) A standby state or a state in which molding is being performed in the mold 8.

(2) The mold 8 is opened and the molded product 6 and the runner portion 7 are dropped on the hopper 1. At this time, the screen surface 20 is closed and the movable chute 3 is connected to the product chute 4 (state of FIG. 4). Therefore, only the product that has passed through the screen surface 20 of the straight rod 2 is discharged from the product chute 4.

(3) The mold 8 is closed again, the sieve surface 20 is opened, and the movable chute 3 is moved to the runner chute 5.
(State of FIG. 5). Therefore, the runner portion 7 is discharged from the runner chute 5.

While the operating condition of the molding machine is determined to be normal, the cycle of (1) → (2) → (3) → (1) is repeated.

Here, a measurement signal indicating the opening / closing of the mold 8 and the operating state of the molding machine is transmitted to the control system of the separating apparatus, and the cycle of opening / closing of the mold 8 and the screen surface 20 of the mold in the progress of the stage. The cycle of opening / closing and path switching (connection switching of the rotating chute 3 to each fixed chute 4, 5) is properly synchronized.

(4) On the other hand, when an abnormal operating condition of the molding machine such as an abnormal molding pressure signal value of the molding machine is detected,
The molded product 6 is determined to be defective, and the separating device is automatically controlled so as to be left in the state (3) (state of FIG. 5). That is, the molded product (defective product 61) molded while the abnormal operating state of the molding machine is sensed is discharged from the runner chute 5 together with the runner portion 7.

In the above embodiment, the molded product and the like are dropped directly from the molding machine to the hopper 1. However, needless to say, the same is true even if the molded product is transferred by a belt conveyor or the like and supplied to the separating device. is there.

In another embodiment, for example, in the injection molding of a washbasin, the molded product 6 is a sieve surface 20 composed of a straight rod 2.
And the runner portion 7 passes through the sieve surface 20,
Other operations and actions are almost the same as those in the above embodiment.

With the configuration of the present invention as described above, in the molding process such as injection molding, the opening size of the mold can be made considerably smaller than in the case of using a robot or an ejector.
In addition, the time required for the robot to move and the waiting time for actuating the ejector become unnecessary. Therefore, the molding cycle can be shortened and the productivity can be improved.

By the separating method and apparatus of the present invention, in addition to the above-described separation of molded products, for example, a target product in which a square hard rubber plate is punched into a circle and at the same time a pin is punched, and an ear made by punching are used. It is also possible to separate efficiently. Also, for example, it is possible to efficiently separate a pachinko ball and a coin.

(Structure and Operation of Driving Section) The driving section for switching the connection of the movable chute 3 to the fixed chutes 4 and 5 and opening and closing the sieve surface 20 will be described with reference to FIG.

In order to rotate the door shafts 21 and 24 of the screen surface 20 and the rotary shaft 31 of the movable chute, rotary levers 26, 27 and 32 are attached to the outside of the separator housing. These three rotary levers are
It is interlocked by two connecting rods 91 and 92 which connect the tip of 2 and the tips of the rotary levers 26 and 27, respectively. The connecting portions 28, 29, 33 are rotatable.
Further, the connecting portion 3 at the tip of the rotary lever 32 of the movable chute 3
The upper end of the rod of the drive cylinder 9 is also rotatably connected to 3, and the lower end of the drive cylinder 9 portion is rotatably connected to a fulcrum 93 of the drive cylinder provided in the separator housing. . By the expansion and contraction of the drive cylinder, the three rotary levers are simultaneously moved. Here, when the drive cylinder 9 is extended, the sieve surface 20 is closed and the movable chute 3 is switched to the connection to the product chute 4 (FIG. 7 (a)), and vice versa when the drive cylinder 9 is contracted ( As shown in FIG. 7 (b), the rotary levers 26, 2
7, 32 and connecting rods 91, 92 are set. Since the drive mechanism is very simple as described above, it is unlikely that the device will fail. Further, since the switching drive requires a minimum amount of power, it can be sufficiently driven by compressed air having a relatively low pressure. Further, since they are driven by the same drive mechanism, malfunctions are reduced.

[0043]

In the method and apparatus for separating a molded product and the like from unnecessary parts or defective products, the structure of the present invention using the minimum number of constituent members and power is very low in cost and almost free from failure. However, it is easy to operate and secure, and the separation is reliable.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a structure of a separation device according to an embodiment of the present invention. Here, (a) is a top view and (b) is a longitudinal sectional view.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3 is a perspective view showing an appearance of a separation device according to an embodiment.

FIG. 4 is a schematic diagram showing how the molded product 6 is separated by the sieve surface 20 and discharged to the product chute 4.

FIG. 5 is an unnecessary portion (runner portion 7) placed on the screen surface 20.
FIG. 7 is a schematic view showing how the oil is discharged to the runner chute 5.

6 (1) to 6 (3) show opening / closing of the sieve surface 20 and path switching (connection of the rotating chute 3 to each fixed chute 4, 5) in accordance with the opening / closing cycle of the mold 8 of the molding machine. It is a schematic diagram which shows a mode that switching is performed. FIG. 6 (4) is a schematic diagram showing a state where all the supplies (molded product 6 and runner portion 7) from the molding machine are discharged from the unnecessary product chute (runner chute 5) in response to the molding state abnormal signal. Is.

FIG. 7 is a diagram showing a state in which the opening and closing of the screen surface 20 and the switching by rotation of the movable chute 3 are simultaneously performed by the drive cylinder 9.

[Explanation of symbols]

 1 Hopper 2 Straight bar (guide bar) 3 Rotating chute 4 Product chute 5 Runner chute 6 Molded product 7 Runner part 8 Mold 9 Drive cylinder

Claims (5)

[Claims] 1. In a step of separating a processed product and an unnecessary portion which are sent together by a processing step such as molding and punching, each time the processed product is supplied, the sieve surface is separated by a sieving means which can be opened and closed. Processed products and unnecessary parts are sorted into product chute and unnecessary product chute by switching the falling path below the screen surface, and when abnormalities such as machining defects occur in the processing process, the screen surface is opened to switch the path. A product separation method in molding or the like, characterized in that all processed products including defective products supplied via the means are sent to the side of the unnecessary product chute. 2. A sieve surface for separating a processed product from an unnecessary portion can be freely opened and closed in a supply portion of the processed product or the like in a step of separating a processed product and an unnecessary portion sent together by a processing step such as molding and punching. With a sieving means, the switching operation is performed below it in synchronization with the opening and closing of the sieving surface,
A route switching means is provided to divide the falling processed product and unnecessary parts into two discharge chutes, a product chute and an unnecessary product chute. One of them is dropped through the sieving means and is sent to the one discharge chute side through the path switching means connected to the corresponding one discharge chute, and then the sieving surface is opened and the path is The switching means is switched to the other discharge chute side, and either the processed product or the unnecessary portion falling from the opening portion of the sieve surface is sent to the other discharge chute side via the path switching means. In addition, when abnormalities such as machining defects occur in the machining process,
By automatic control based on an abnormality occurrence signal, the sieve surface is opened and the path switching means is switched to the unnecessary product chute side so that all processed products including defective products supplied are supplied to the unnecessary product chute side. A method for separating products in molding, etc. 3. Freely opening and closing by which the processed product is separated from the unnecessary part and dropped into the supply part for the processed product in the step of separating the processed product and the unnecessary portion sent together by the processing steps such as molding and punching. A sieving means having a sieving surface and dropping unnecessary portions by opening the sieving surface, and under the sieving means, a switching operation is performed in synchronization with opening and closing of the sieving surface, the processed product, and The rotating floor type or seesaw type path switching means for allocating the unnecessary portion to the product chute and the unnecessary product chute by switching the connection of the dropping path and the opening operation of the sieving surface and the switching operation of the path switching means are synchronized. , And a synchronous drive means for driving these operation cycles in synchronization with the supply cycle of the processed product, etc., and the synchronous drive means is provided when an abnormality such as a processing failure occurs in the processing machine. It is configured to be driven and controlled by the raw signal so that the screen surface is opened and the path switching means is switched to the unnecessary product chute side, and all processed products including defective products supplied are not required as unnecessary products. A product separating device for molding or the like, which is characterized in that the product is sent to the product chute side. 4. The product separating apparatus for molding or the like according to claim 3, wherein the opening and closing of the screen surface and the switching operation by the path switching means are driven by the same cylinder mechanism. 5. The sieve surface is composed of rods arranged in a comb shape, and the rods arranged in a comb shape are arranged in a double-opening door shape that opens downward with a root of a comb tooth as a door shaft. The rod extending from one of the door shafts and the rod extending from the other of the door shafts are alternately arranged in a lateral direction of the rod with the sieve surface closed. Product separation device for molding.