JP2961512B2 - Molded product weight measuring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the weight of a molded article disposed below a molded article discharge port of a molding machine and measuring the weight of the ejected molded article.

[0002]

2. Description of the Related Art In general, when a product is molded by an injection molding machine, the weight of the molded product (product) is one of important inspection items.

Conventionally, the weight of a molded product is indirectly detected based on the most advanced position of a screw which is proportional to the amount of resin filled in a mold cavity in an injection molding machine, and based on the detection result. The quality of the molded product was determined. In this case, the quality is determined by setting a predetermined monitor range in advance, and if the detection result falls within the monitor range, the product is determined to be good, while if the detection result is out of the monitor range, the product is determined to be defective.

[0004]

However, the conventional detection method described above is inaccurate because the weight is indirectly detected, and there is a possibility that a non-defective product (defective product) may be determined as a defective product (non-defective product). There was a problem lacking.

On the other hand, the weight of the molded article may be measured directly. However, since the weight measurement of the molded article is performed after the molded article is discharged from the injection molding machine, a dedicated device separate from the injection molding machine is required. For example, there was a problem that cost was increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems existing in the prior art, and is intended to provide an apparatus for measuring the weight of a molded article which can accurately judge the quality of the molded article and can be implemented at low cost. For the purpose of providing.

[0007]

According to the present invention, the weight of a molded product C discharged from a molded product discharge port Mo is disposed below a molded product discharge port Mo of a molding machine M. In the molded article weight measuring device 1, a weight measuring device 2 disposed below the molded product discharge port Mo, a weighing dish mounting frame 3 disposed between the molded product discharge port Mo and the weighing device 2, and a weighing dish mounting The weighing dish 4 placed on the frame 3 and the weighing dish placing frame 3 are moved up and down,
The receiving position Pu where the weighing pan 4 receives the molded article C discharged from the molded article discharge port Mo, the measuring position Pd and the receiving position Pu where the weighing pan 4 is separated from the weighing pan 4 with the weighing pan 4 placed on the weighing device 2. It has a lifting mechanism 5 for moving to a discharge position Pm located in the middle of Pd, and a tilting mechanism 6 for tilting the weighing dish mounting frame 3 at the discharge position Pm to discharge the molded product C on the weighing dish 4. It is characterized by.

In this case, according to a preferred embodiment, the weighing pan 4 has a locking portion 7 that locks to the weighing pan mounting frame 3 when the weighing pan mounting frame 3 is inclined. The weight measuring device 2 uses an electronic balance 2e, and the molding machine M includes a data processing unit 8 that receives the weight data from the electronic balance 2e and determines the quality of the measured molded product C. On the other hand, when the weighing dish mounting frame 3 is tilted, the shooter 9 for discharging the molded product C discharged from the weighing dish 4 to the outside is provided. In addition, the reversing shooter unit 1 for changing the discharge direction of the molded product C
0 is provided.

By controlling the drive of the lifting mechanism 5 and moving the weighing pan 4 to the upper receiving position Pu, the weighing pan 4
Is the molded product C discharged from the molded product discharge port Mo of the molding machine M
Can receive. On the other hand, if the lifting mechanism 5 is drive-controlled and the weighing pan 4 is moved to the lower measurement position Pd, the weighing pan 4 is placed on the electronic balance 2e (the weighing device 2), and the weighing pan mounting frame 3 is moved. Separate from the weighing pan 4 downward. As a result, the weighing dish 4 becomes free, the weight of the molded product C (and the weighing dish 4) is accurately measured by the electronic balance 2e, and the weight data is given to the data processing unit 8 of the molding machine M. Thus, a pass / fail judgment is made. And
In the case of a defective product, the reversing shooter unit 10 is reversed.
When the measurement is completed, the elevation mechanism 5 is driven and controlled, the weighing pan 4 is moved to the discharge position Pm, and the tilting mechanism 6 is driven and controlled at the discharge position Pm to incline the weighing pan mounting frame 3. The molded product C on the weighing dish 4 is discharged to the outside via the shooter 9. At this time, the locking portion 7 of the weighing dish 4
The weighing pan 4 is locked on the weighing pan mounting frame 3, and the weighing pan 4 is prevented from moving (falling).

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a preferred embodiment of the present invention.

First, the configuration of a molded article weight measuring apparatus 1 according to the present embodiment will be described with reference to FIGS.

The apparatus 1 for measuring the weight of a molded article is provided with a table 11, and on the bottom surface of the table 11, there are provided a plurality of height-adjustable legs 13 having casters 12. The upper surface of the table 11 is formed in a horizontal plane, a vibration isolator 14 having rubber feet is installed, and an electronic balance 2e (weight measuring device 2) is placed on the vibration isolator 14.

On the other hand, the periphery of the table 11 is covered with a transparent casing 15. The casing 15 has side portions 15a,
15b, 15c, 15d and a top surface portion 15e, and the side surface portion 15a is provided with an openable door 15f to be a front surface.

The shooter mechanism 1 is provided on the side surface 15b.
6 is attached. The shooter mechanism 16 includes an inclined shooter 9. The shooter 9 includes a shooter body 17 and a reversing shooter 10 disposed forward of the shooter body 17 in the discharge direction. The reversing shooter unit 10 is rotated by 90 ° by the rotary actuator 18, and is at a normal position indicated by a solid line continuous with the shooter body 17 or at 90 ° from this position.
It is selectively displaced to the reverse position shown by the rotated virtual line 10s. Reference numeral 19 denotes a shooter cover that covers the shooter 9 provided on the casing 15.

On the other hand, the side surface portion 15 of the casing 15
A drive chamber 20 is attached to c, and a molded product drop hole 21 is provided in the center of the top surface 15e. In the drive room 20,
An elevating mechanism 5 and a tilting mechanism 6 and a control unit 22 (see FIG. 8) for controlling them are provided. The lifting mechanism 5 utilizes a rodless air cylinder 23 and is disposed vertically. Also, the movable part 23m of the rodless air cylinder 23
Attach a rotary actuator 24 to
The shaft 24s of the rotary actuator 24 projects above the table 11 through a slit 25 provided in the side surface 15c. Then, the weighing dish mounting frame 3 is attached to the tip of the shaft 24s. The weighing dish mounting frame 3 includes a rectangular frame main body 26 and a connecting portion 26c for attaching the frame main body 26 to the shaft 24s.
1 and the electronic balance 2e.

The weighing pan 4 is placed on the weighing pan mounting frame 3.
Is placed. The weighing dish 4 has a relatively small rectangular bottom portion 4d at the center and a side portion 4s gently rising outward from the bottom portion 4d, and the side portion 4s rests on the frame body 26. Supported. The locking part 7 shown in FIG. 3 is attached to the outer surface of the side part 4s. The locking portion 7 is formed in a hook shape, and locks to the weighing dish mounting frame 3 when the weighing dish mounting frame 3 is inclined to prevent movement (fall). Further, at the three places on the lower surface of the bottom surface 4d, there are provided feet 27 having a pointed lower end as shown in FIG. This prevents the heat of the molded product from being transmitted to the electronic balance 2e. A rubber sheet (not shown) is also placed on the electronic balance 2e to prevent heat transmission.

On the other hand, the control system is configured as shown in FIG. As shown in FIG. 6, the molded product weight measuring device 1 is arranged side by side on a molding machine (injection molding machine) M, and is configured to be connectable to a central controller 31 built in the molding machine M. The control unit 22 built in the drive chamber 20 of the molded article weight measuring device 1 has a function of connecting to the central controller 31 via the communication cable 32 and controlling the driving of the air cylinder 23 and the rotary actuators 18 and 24, respectively.
Further, the electronic balance 2 e is connected to the central controller 31 via the optical communication unit 33.

Next, the operation of the molded article weight measuring apparatus 1 according to the present embodiment will be described with reference to the drawings.

First, the molded article weight measuring device 1 is installed as shown in FIG. In FIG. 6, reference numeral 35 denotes a molding machine shooter provided in the molding machine M. The tip of the molding machine shooter 35 is a molded product discharge port Mo. And the molded article weight measuring device 1
Is installed below the molded product discharge port Mo. The container A is placed below the tip of the shooter mechanism 16. The molding machine shooter 35 is configured as shown in FIG. 7, and a shutter plate 36 is disposed inside the molding machine shooter 35 near the molded product discharge port Mo. Shutter plate 36
Is one end of the shaft 37s of the rotary actuator 37.
Attach to As a result, the shutter plate 36 blocks the passage of the molding machine shooter 35 and the molding machine shooter 35
It is displaced to a cut-off position indicated by a solid line for preventing air from entering the molded article drop hole 21 from the side or to an open position indicated by an imaginary line 36s for opening the passage of the molding machine shooter 35 to drop the molded article downward. .

When the molded product is discharged from the mold upon completion of the molding, the molded product falls into the molding machine shooter 35.
At this time, the shutter plate 36 is shown by a virtual line 36s in FIG.
The molded product falls into the molded product drop hole 21 in the molded product weight measuring device 1 as it is at the open position indicated by. FIG. 1 shows a state in which the molded product C has dropped in the direction of the arrow H.

On the other hand, in the molded article weight measuring apparatus 1, the air cylinder 23 is driven and controlled by the control unit 22, and the weighing pan 4 is controlled.
Has moved to the receiving position Pu indicated by a virtual line in FIG. The receiving position Pu is located immediately below the molded product drop hole 21 and receives the molded product C falling from the molded product drop hole 21. In this case, the relationship between the weighing dish 4 and the weighing dish mounting frame 3 is such that the weighing dish 4 is mounted on the weighing dish mounting frame 3 as shown in FIG.

Next, the control unit 22 controls the air cylinder 2
3 is controlled, and the weighing pan 4
Moves to the measurement position Pd indicated by the solid line in FIG. Thereby, the weighing dish 4 is placed on the electronic balance 2e, and the weighing dish mounting frame 3 is separated from the weighing dish 4. That is, in this case, the relationship between the weighing dish 4 and the weighing dish mounting frame 3 is such that the weighing dish mounting frame 3 is separated downward from the weighing dish 4 and does not contact the locking portion 7, as shown in FIG. It stops at the position and the weighing pan 4 is free.

In this state, the weight of the molded article C (and the weighing dish 4) is measured by the electronic balance 2e. The weight data is transferred to the central controller 31 by an optical signal via the optical communication unit 33 in response to a data request given from the central controller 31 of the molding machine M, and the quality is judged by the data processing unit 8 in the central controller 31. At this time, in the case of a defective product, the central controller 31
Sends an inversion command to the control unit 22 via the communication cable 32, and the control unit 22 performs control to switch the inversion shooter unit 10 to the inversion position indicated by the virtual line 10s in FIG. In addition,
If there is no response even if the data is requested a predetermined number of times from the central controller 31, an error signal is output with the weight data as zero. Further, at the time of measurement, the shutter plate 36 of the molding machine shooter 35 is displaced to the blocking position shown by the solid line in FIG.
The air is prevented from entering the molded product falling hole 21 from the fifth side.

On the other hand, when the measurement is completed, the drive of the air cylinder 23 is controlled by the control unit 22, and the weighing dish 4 moves to the discharge position Pm. When the rotary actuator 24 is driven and controlled at the discharge position Pm to tilt the weighing dish mounting frame 3, the molded product C on the weighing dish 4 is discharged to the outside via the chute 9. Note that the locking portion 7 of the weighing dish 4 is
As shown in (5), the weighing pan 4 is locked on the weighing pan mounting frame 3, and the weighing pan 4 is prevented from moving (falling). In this case, when the molded product C is a good product, the inverted shooter unit 10 is located at a regular position indicated by a solid line, and the molded product C is stored in the container A. The defective product is located at the reversing position indicated by the line 10s, and the defective product collection box An
To be housed. Thereafter, the weighing dish mounting frame 3 is returned to the horizontal position, rises, and stands by at the receiving position Pu.

As described above, since the molded article weight measuring apparatus 1 according to the present embodiment directly measures the weight of the molded article, it is possible to accurately determine the quality of the molded article. In addition, since data processing and data storage related to pass / fail determination are performed using the central controller 31 of the molding machine, the data processing function in the molded article weight measuring device 1 is not required, and the cost can be reduced. In this case, the molding machine M can obtain indirect weight data detected based on the most advanced position of the screw and the like, so that the weight data of the molding machine M and the weight data of the measuring device 1 can be compared. If the weight data of the molding machine M is defective, the molding machine M side is defective, but the measuring device 1 is defective, and the molding machine M is defective. If the measuring device 1 is non-defective, it can be collected separately for reconfirmation.

The embodiment has been described in detail above.
The present invention is not limited to such an embodiment,
The configuration, shape, quantity, material, method, and the like of the details can be arbitrarily implemented without departing from the spirit of the present invention.

[0027]

As described above, the apparatus for measuring the weight of a molded article according to the present invention comprises: a weight measuring device arranged below a molded article discharge port;
A weighing dish mounting frame disposed between the molded product outlet and the weighing device,
The weighing pan placed on the weighing pan mounting frame and the weighing pan mounting frame are raised and lowered, and the weighing pan is placed at a receiving position for receiving the molded product discharged from the molded product discharge port, and the weighing pan is placed on the weighing device. The lifting mechanism moves the measuring position away from the weighing pan and the discharge position located in the middle of the receiving position and the measuring position, and discharges the molded product on the weighing pan by tilting the weighing pan mounting frame at the discharge position Since the tilt mechanism is provided, the following remarkable effects can be obtained.

Since the weight of the molded product is directly measured, accurate weight data can be obtained, and an accurate quality judgment for the molded product can be performed.

Since data processing can be performed by the central controller of the molding machine, the data processing function of the molded article weight measuring device is not required, and the processing can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a molded article weight measuring apparatus according to the present invention,

FIG. 2 is a partial cross-sectional plan view of the molded product weight measuring device,

FIG. 3 is a front view showing a weighing dish and a weighing dish mounting frame at a receiving position of the molded article weight measuring device;

FIG. 4 is a front view showing a weighing dish and a weighing dish mounting frame at a measurement position of the molded article weight measuring device;

FIG. 5 is a front view showing a weighing dish and a weighing dish mounting frame at a discharge position of the molded article weight measuring device;

FIG. 6 is a front view showing an installation state of the molded article weight measuring device including a molding machine;

FIG. 7 is a sectional configuration diagram of a molding machine shooter provided in the molding machine;

FIG. 8 is a block diagram of a control system of the molded article weight measuring device and the molded machine;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 molded product weight measuring device 2 weight measuring device 2 e electronic balance 3 weighing pan mounting frame 4 weighing pan 5 lifting mechanism 6 tilting mechanism 7 locking part 8 data processing part 9 shooter 10 reversing shooter part M molding machine Mo molded product outlet C Molded product Pu Receiving position Pd Measuring position Pm Discharging position

Continuation of the front page (56) References JP-A-3-207616 (JP, A) JP-A-3-266622 (JP, A) JP-A-3-69331 (JP, A) JP-A-1-245595 (JP) JP-A-63-295226 (JP, A) JP-A-45-30952 (JP, A) JP-A-63-149713 (JP, U) JP-A-60-76232 (JP, U) (58) Surveyed field (Int.Cl. ⁶ , DB name) B29C 45/17 B29C 45/76

Claims (6)

(57) [Claims] 1. A method according to claim 1, further comprising:
In the molded article weight measuring device that measures the weight of the molded article discharged from the molded article discharge port, a weight measuring device disposed below the molded article discharge port, between the molded product discharge port and the weight measuring instrument A weighing dish mounting frame to be arranged, a weighing dish mounted on the weighing dish mounting frame, and the weighing dish mounting frame are moved up and down,
A receiving position at which the weighing pan receives the molded product discharged from the molded product discharge port, a measuring position at which the weighing pan is separated from the weighing pan with the weighing pan placed on the weighing device, and an intermediate position between the receiving position and the measuring position; And a tilting mechanism for tilting the weighing pan mounting frame at the discharge position to discharge a molded article on the weighing pan. Product weight measuring device. 2. The weight of the molded product according to claim 1, wherein the weighing dish has a locking portion that locks to the weighing dish mounting frame when the weighing dish mounting frame is inclined. measuring device. 3. The molded product weight measuring device according to claim 1, wherein the weight measuring device is an electronic balance. 4. The molded product weight measuring apparatus according to claim 1, wherein the molding machine is provided with a data processing unit that receives weight data from an electronic balance and determines the quality of the measured molded product. . 5. The molded product weight measuring device according to claim 1, further comprising a shooter that discharges the molded product discharged from the weighing pan when the weighing pan mounting frame is inclined. 6. The molded product weight according to claim 4, wherein the chute is provided with a reversing chute unit for changing a discharge direction of the molded product when the data processing unit determines that the product is defective. measuring device.