JPH0531928U - Product ejection device of injection molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a product take-out device for an injection molding machine, by automatically detecting an abnormality in the molding state, and judging the quality of the product according to the detection result, and taking out defective products. The purpose is to reduce the inspection man-hours by eliminating the need for inspection of the number of workers and the number of workers. In a product take-out device of an injection molding machine, which is provided with a hand 34 and support arms 32, 33 for movably supporting the hand, and transfers the product W taken out from a mold part to a predetermined storage position by the movement of the hand 34. A stopper pin 41 capable of projecting and retracting toward the hand 34 is supported on the support arm 33. When the pin 41 projects, it stops the hand 34 at an intermediate position within the range of movement of the hand, and when it sinks, the stop of the hand is released. . Further, the cylinder 40 for retracting the pin 41 is mounted on the arm 33, the cylinder 40 is controlled based on the determination result of the determination means for determining the quality of the injection molding state, and when the injection molding state deteriorates. The stopper pin 41 is projected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a product take-out device for an injection molding machine, and more particularly to a device for putting a taken-out product in a magazine or the like.

[0002]

[Prior Art]

 Conventionally, in some injection molding machines, a device for taking out a molded product from the molding die is provided side by side with the molding machine main body to automate the injection molding system. An example of a product unloading device of this type of injection molding machine is one in which a product unloading hand is driven by a plurality of air cylinders and the like, and the molded product taken out from the mold is stored in a product storage magazine at a predetermined unloading position. In this device, the number of products stored is counted by detecting the product or the hand when the product is stored by a detection means such as an optical sensor.

[0003]

[Problems to be solved by the device]

 However, in such a conventional product taking-out device of an injection molding machine, since only the taking-out and storing operations of the product are detected, even if the product is defective, the product is taken out to a predetermined carrying-out position. However, it was supposed to be stored in the product storage magazine. Therefore, it was necessary to inspect all the products stored in the product storage magazine as to whether they were non-defective or not, and to hand out defective products by hand. In addition, for product storage magazines from which defective products have been extracted, it was necessary to perform a factor test on the non-defective product group. As a result, there is a problem that the number of inspection steps increases.

Therefore, the present invention focuses on the fact that a defective molded product is caused by an abnormal cushion amount of a screw, an abnormal injection time and an abnormal measuring time, and automatically detects these abnormalities to determine whether the molded product is good or bad. The purpose is to reduce the inspection man-hour by eliminating the need for the above-mentioned defective product removal work and inspection of the number of workers.

[0005]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises a gripping unit for gripping a product molded by a mold part and taking it out from the mold part, and a support arm for movably supporting the gripping unit. In the product take-out device of the injection molding machine that transfers the product taken out from the mold part to the predetermined storage position by moving the gripping unit, it is possible to project and immerse into one of the gripping unit and the support arm from the one to the other. Is supported by the gripping unit or the stopper pin that stops the gripping unit at an intermediate position within the predetermined gripping unit movement range when the protrusion is made, and releases the stop of the gripping unit when it is retracted, and the gripping unit or Stopper operating means mounted on the support arm, judging means for judging the quality of the injection molding state of the injection molding machine, and judging means Controlling the stopper actuating means based on a determination result, and control means to protrude the stopper pin when the elevation-molded state has worsened and is characterized that you provided.

[0006]

[Action]

 According to the present invention, when the determination means determines the quality of the injection molding machine, the stopper actuation means is controlled based on the determination result, and when the molding state deteriorates, the stopper pin protrudes. As a result, the gripping unit is stopped at a predetermined intermediate position within the movement range. Therefore, the stop position of the gripping unit, which is the delivery destination of the product, is changed depending on the quality of the injection molding state of the injection molding machine, and the good product and the defective product are reliably sorted.

[0007]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings. 1 to 3 are views showing an embodiment of a product take-out device of an injection molding machine according to the present invention. First, the configuration will be described. In FIG. 1, reference numeral 10 denotes a main body of the injection molding machine, and the molding machine main body 10 is equipped with a product take-out device 20. The molding machine main body 10 includes a main body frame 11, upper and lower molds 12A and 12B, a mold clamping mechanism section 13 and an injection mechanism section 14. The product W molded by the injection molding machine body 10 is a product take-out device. It is taken out from the upper and lower molds 12A and 12B by 20 and stored in a predetermined storage position (details will be described later).

The mold clamping mechanism 13 includes an upper die plate 15A holding an upper die 12A, a lower die plate 15B fixed to the lower die 12B and supported by the main body frame 11, and a lower die. A movable plate (not shown) provided in the main body frame 11 below the plate 15B, and a plurality of tie bars 17 that are vertically movably guided by the lower die plate 15B and connect the upper die plate 15A and the movable plate. It has a hydraulic cylinder (not shown) which is interposed between the lower die plate 15B and the movable plate and which expands and contracts by hydraulic pressure to open and close the upper and lower dies 12A and 12B and close the dies. Since the other basic structure of the injection molding machine, which is not shown in detail, is known, the product take-out device will be described in detail below.

The product take-out device 20 includes a take-out unit 21, a shooter unit 22, and a storage unit 23. The take-out unit 21 includes a column 31 extending in the vertical direction, and a first arm 32 extending in the horizontal direction supported by the column 31 so as to be rotatable in the horizontal direction (hereinafter, also simply referred to as turning). And a second arm 33 rotatably supported by the tip of the first arm 32, and a hand 34 (grasping unit) rotatably supported by the second arm 33 in the vertical direction. .. Here, the support column 31 is erected and fixed on the base 11a of the main body frame 11 by a plurality of bolts (not shown), and the base end of the first arm 32 is supported on the upper end side of the support column 31 so as to be able to move up and down and rotate. ing. A second arm 33 is rotatably supported at the tip of the first arm 32, and the hand 34 is sandwiched between the upper and lower molds 12A and 12B by the swinging and ascending / descending movements of both arms 32, 33 as supporting arms. It moves between the reserved space and a predetermined product storage magazine, for example, a product storage box 51. The second arm 33 has a tip shape as shown in FIG. 2, and supports the hand 34 rotatably up and down via a rotation center shaft 35. The rotation center shaft 35 is driven to rotate by a rotation cylinder 36 attached to the second arm 33, and the rotation of the rotation cylinder 36 causes the hand 34 to rotate in the vertical direction within a predetermined rotation range. Move. The hand 34 is, for example, an air chuck that is operated by compressed air, and has a pair of gripping claws 37 (gripping portions) that grip the product W molded by the upper and lower molds 12A and 12B.

On the other hand, an air cylinder 40 is attached to the second arm 33. The air cylinder 40 is supported by the second arm 33 so that the stopper pin 41 (piston of the air cylinder 40) can be retracted from the arm 33 toward the hand 34, and operation switching of solenoid valves (not shown) can be performed. The stopper pin 41 can be projected toward the hand 34 side and further retracted by switching the valve (which constitutes the stopper operating means together with the air cylinder 40). When the stopper pin 41 protrudes from the hole 33a formed in the second arm 33 toward the hand 34 side, as shown by an imaginary line in FIG. (It may be close to one end of the range), the hand 34 is prevented from rotating downward, and the hand 34 is stopped. Further, when the stopper pin 41 is retracted into the hole 33a of the second arm 33, the stopper pin 41 releases the blocking and allows the hand 34 to rotate freely. Compressed air that drives the hand 34 (air chuck) and the rotary cylinder 36 is supplied from an air pressure source via an operation switching valve such as a solenoid valve, similar to the air cylinder 40. It is controlled by a controller (not shown) (details will be described later).

The shooter unit section 22 has a shooter plate 61 that is rotatable in the left-right tilt direction and a cylinder 62 that rotates the shooter plate 61. The defective molded product released from the hand 34 and dropped is discharged to a belt or a defective product storage box (not shown) on the right side. The cylinder 62 is also controlled by the controller via an operation switching valve (not shown).

The controller has a CPU, a ROM, a RAM, and an input / output interface circuit, and according to a predetermined control program stored in advance in the ROM, includes setting conditions from a control monitor (not shown) and position detecting means. Based on the sensor information from various sensors, the timer information of the internal timer, etc., the hydraulic pressure control valve such as the mold clamping cylinder, the operation switching valves, the motor (for rotating the injection screw, etc.), etc. are controlled. As the position detecting means, for example, a potentiometer, a limit switch, and an encoder are provided. The mold opening / closing stroke and mold clamping amount of the upper and lower molds 12A and 12B, the ejector ejecting amount, the nozzle touch position of the injection cylinder, and the lifting stroke. Position, screw position (injection, weighing, suckback position), etc. are detected. In addition, the output part of the controller controls a hydraulic switching unit that switches operating hydraulic pressures of the mold opening / closing cylinder, the mold clamping cylinder, the ejector, the nozzle touch cylinder, and the injection cylinder, and each actuator of the product take-out device 20. A control unit, an air pressure switching unit that switches the operating air pressure, and the like are provided, and the operation of each operating unit is controlled by these.

Further, the controller works as a judgment means for judging the quality of the injection molding state of the injection molding machine main body 10 in cooperation with the above-mentioned sensors, and an alarm means and an air cylinder (not shown) based on the judgment result. The control means controls 40, sounds an alarm when the injection molding condition deteriorates, and causes the stopper pin 41 to project when the product is taken out. Specifically, the controller controls the abnormality determination conditions set by the control monitor, for example, the upper and lower limits of the cushion amount of the screw (the gap from the screw tip to the injection nozzle tip at the time of mold clamping), the upper and lower limits of the injection time, and The upper and lower limits of the measurement time are stored in the internal memory, and each time molding is performed, these judgment conditions are compared with the actual operating state to judge whether there is an abnormality. When there is no abnormality in the molding state, the stopper pin 41 is retracted to allow the hand 34 to rotate downward, and the first and second arms 32 and 33 move the hand 34 onto the product storage box 51. The product W gripped by the grip claw 37 by the hand 34 is released into the product storage box 51. Further, when an abnormality occurs, the stopper pin 41 projects and the hand 34 stops at the predetermined intermediate position to release the defective product W onto the shooter plate 61.

As shown in FIGS. 3A to 3C, the product storage box 51 includes an outer frame body 52 and vertical and horizontal partition portions 53 and 54, and a predetermined number (for example, 9 × 4 = 9 × 4 = 36 storage spaces are formed with the upper part open. Next, the operation will be described. First, the control monitor stores in advance the abnormality determination conditions, for example, the upper and lower limits of the screw cushion amount, the upper and lower limits of the injection time, and the upper and lower limits of the weighing time, in the internal memory. It should be possible to compare with the operating state (sensor information indicating the injection molding state).

Next, when the upper and lower molds 12A and 12B are closed and clamped, and the molten resin is injected and filled into the cavities (not shown) in the upper and lower molds 12A and 12B by the injection mechanism section 14, The determination conditions are compared with the sensor information in the actual operating state to determine whether or not there is an abnormality in the molding state. Now, assuming that the result of this determination is no abnormality, the upper and lower molds 12A and 12B are opened after a predetermined cooling time has elapsed since the resin was injected into the upper and lower molds 12A and 12B, and the first and second molds were opened. The solidified molded product is taken out by turning and raising and lowering the two arms 32, 33. That is, the hand 34 in the horizontal position is inserted between the upper and lower molds 12A and 12B by the turning of the first and second arms 32 and 33, and the product W is taken in between the gripping claws 37 by the lowering of the first arm 32. Be done. Then, the product W is gripped by the grip claws 37 by the chucking operation of the hand 34, and is moved onto the product storage box 51 by the raising and turning of the first arm 32. Next, the hand 34 is rotated downward by the rotary cylinder 36 so that the product W is directed right below, the arms 32 and 33 are lowered, and the gripping of the product W by the gripping claws 37 is released. It is stored in 51.

On the other hand, if the determination result is abnormal, first, an alarm is sounded by the alarm means. Next, when the resin is injected into the upper and lower molds 12A and 12B and a predetermined cooling time elapses, the upper and lower molds 12A and 12B are opened, and the first and second arms 32 and 33 are solidified by rotating and moving up and down. The defective molded product is taken out. At this time, the cylinder 40 and the cylinder 62 are actuated, the stopper pin 41 projects toward the hand 34 side, and the shooter plate 61 rotates to the right. Therefore, the hand 34 rotated downward by the rotary cylinder 36 is stopped by the stopper pin 41, and the hand 34 stops at the predetermined intermediate position. When the grip claw 37 of the hand 34 is opened in this state, the defective product is discharged from the shooter plate 62 to the external belt or the defective product storage box, and is not stored in the product storage box 51.

As described above, in the present embodiment, the controller determines whether the injection molding state is good or bad, and the stop position of the hand, which is the delivery destination of the product, is changed according to the determination result, and the good product and the defective product are sorted. It Therefore, the work of sorting the non-defective product from the non-defective product can be easily performed without any human labor, and only the non-defective product W can be reliably stored in the product storage box 51. As a result, it is no longer necessary to perform a defective product extraction work or a factor inspection in the product storage box 51 after the extraction as in the conventional case, and the inspection man-hour can be greatly reduced.

[0018]

[Effect of the device]

 According to the present invention, the judgment means judges the quality of the injection molding machine, and the control means controls the stopper actuating means based on the judgment result, and when the molding state deteriorates, the stopper pin is moved to the gripping unit side. Since the grip unit is projected and stopped at an intermediate position within the grip unit moving range, the stop position of the grip unit, which is the product delivery destination, can be changed depending on the quality of the injection molding state of the injection molding machine. Therefore, it is possible to sort good products and defective products easily and surely, and it is possible to significantly reduce the inspection man-hours.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of a product takeout device of an injection molding machine according to the present invention.

2A and 2B are diagrams showing a main configuration of a product take-out device of one embodiment, FIG. 2A is a front view including a partial cross section thereof, and FIG. 2B is a bottom view thereof.

FIG. 3 is a diagram showing a configuration of a product storage box of one embodiment,
(A) is the top view, (b) is the side view, (c) is the partial front view.

[Explanation of symbols]

 10 Injection molding machine main body 11 Main body frame 11a Frame 12A, 12B Upper and lower molds 20 Product take-out device 21 Take-out unit 22 Shooter unit 23 Storage unit 32 First arm (support arm) 33 Second arm (support arm) 34 Hand (Gripping unit) 37 Gripping claw (Gripping part) 40 Air cylinder (Stopper operating means) 41 Stopper pin 51 Product storage box 61 Shooter plate

Claims (1)

[Scope of utility model registration request] 1. A product taken out from the mold part, comprising a gripping unit for gripping a product molded by the mold part and taking it out from the mold part, and a support arm for movably supporting the gripping unit. In a product take-out device of an injection molding machine that transfers the gripping unit to a predetermined storage position by moving the gripping unit. One of the gripping unit and the support arm is supported so as to project from and retract into the other, and It is mounted on the gripping unit or the support arm so that the gripping unit is sometimes stopped at an intermediate position within a predetermined gripping unit movement range and is released when the gripping unit is retracted, and the stopper pin is projected and retracted. The stopper actuation means, the judgment means for judging the quality of the injection molding state of the injection molding machine, and the judgment result of the judgment means A product take-out device for an injection molding machine, comprising: a control means for controlling the stopper actuating means so as to project the stopper pin when the injection molding state deteriorates.