JP3075938B2 - Checking method of product confirmation sensor of molding machine and product unloading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a method of checking products confirmation sensor of the molding machine it can to prevent shut-proof the product take-out detection error based on the product confirmation sensor defective damage to the mold in advance
And product removal equipment .

[0002]

2. Description of the Related Art In a molding machine such as a die casting machine,
An automatic product take-out machine is used to take out the product after the casting or the injection is completed. Product removal errors lead to mold damage and work accidents, so a product confirmation sensor is provided to check product removal every time.

That is, after a product is taken out of a mold by an automatic product take-out machine, a specific location of the product is detected by a product confirmation sensor such as a limit switch or a photoelectric tube installed at any of the movement trajectories of the product. Is turned on, it is determined that extraction confirmation has been completed, and the process proceeds to the next cycle.

However, in such a method, if a signal is kept on due to a sensor abnormality, a wiring abnormality, or the like, it is assumed that a product that has been taken out despite a product taking error has been detected. Judgment will automatically proceed to the next cycle, mold will be clamped even though the product remains in the mold, and the mold will be damaged despite the provision of a product confirmation sensor There is a problem.

[0005] Further, since the worker assumes that the product will not be clamped when the product remains in the mold, the operator inserts his arm into the mold to remove the product from the mold. This can lead to serious personal injuries.

[0006]

The problem to be solved by the present invention is as follows.
An object of the present invention is to surely check a product confirmation sensor and a control line thereof, and to prevent an operation failure due to a sensor failure or a control line failure.

The method for checking the product confirmation sensor (S) of the molding machine (A) according to the present invention is described in "Molding machine (A) to product (2)".
4) is taken out by the product take-out machine (B) and the product transfer position 1
In the product removal process of transferring the product (24) to the product transfer position 10 by checking whether or not the product (24) has been removed by the product confirmation sensor (S) during the transfer to the product (2).
After 4) reaches the transfer position 10, the on / off state of the product confirmation sensor (S) is detected. When the product confirmation sensor (S) is off, the product confirmation sensor (S) is normal. When the product confirmation sensor (S) is in the ON state, it is detected whether or not the product confirmation sensor (S) is turned off during a predetermined time, and the product confirmation sensor (S) is detected during the predetermined time. If it is switched off, it is determined that the product confirmation sensor (S) is normal, and if it remains on after a certain period of time, it is determined that the sensor is defective. "
It is characterized by things. In addition, the product collection of the molding machine (A) of the present invention.
The dispensing device is a product from the mold (5) (6) of the molding machine (A).
(24) a product take-out machine (B) for taking out and the mold
(5) The product (24) extracted from (6) is
It is arranged in the transfer locus (K) until it reaches the feed position 10.
And the product (24) was taken out of the molds (5) and (6).
Product confirmation sensor (S) for confirming whether
After the product (24) reaches the transfer position, the product confirmation
Product (S) on / off state detection and product confirmation sensor
When (S) is off, the product confirmation sensor (S) is
The product confirmation sensor (S) is in the ON state.
In the case, the product confirmation sensor (S) is turned off during a certain time
Detects whether or not to switch, and confirms the product within a certain period of time
If the sensor (S) switches off, the product confirmation
Sensor (S) is judged to be normal, and
If the sensor state is maintained, it is determined that the sensor is defective.
It has a check function for the product confirmation sensor. ”
I do.

Accordingly, the product confirmation sensor (S) is monitored every time, and even if a sensor failure occurs and an ON signal is continuously output, it is determined that the removal of the product (24) is completed. It is possible to accurately judge that the sensor is defective, and to prevent an accident based on the sensor defect.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. The molding device (A) includes a die casting machine, an injection molding machine, and the like. Fig. 1 is a plan view of the die casting machine. A description will be given of the case of taking out by using.

FIG. 1 is a plan view of a die casting machine using a toggle mechanism as a mold clamping device. A fixed die plate (3) is erected in the center of the base frame (1), and a movable die plate (4) is slidably disposed on the opposite side of the fixed die plate (3), and further thereafter. Tail stock (2) is installed. Tie bars (7) are inserted at four corners of the fixed die plate (3), the movable die plate (4) and the tail stock (2), and are shown between the tail stock (2) and the movable die plate (4). The movable die plate (4) reciprocates along the tie bar (7) due to expansion and contraction of the toggle mechanism that does not .

A movable die (5) and a fixed die (6) are provided on the opposing surfaces of the movable die plate (4) and the fixed die plate (3), respectively. The movement causes the mold to be opened and closed. An injection mechanism (18) having a molten metal pool (not shown) is connected to the fixed mold (6) through a fixed die plate (3). On the other hand, the back of the movable die plate (4) is installed et di-object mechanism (20), the ejection pin (20a) is inserted into the moving mold (5).

One side of the molding machine (A) is an automatic product take-out machine (B)
Is installed. Base stand for automatic product unloader (B) (1)
As shown in Fig. 2, a linear guide (27) is protruded from the side of the base stand (1) on the automatic product unloader (B) side, and a pin mounting part (30) is located below the linear guide (27). A guide pin (29) is inserted at the tip. On the other hand, a roller (26) protrudes from the drive box (8) and is rotatably disposed in the linear guide (27). A linear cam plate (31) is provided below the roller (26), and the guide pin (29) is fitted into a linear cam groove (28) formed in the linear guide cam plate (31). In. Thus, when the drawing cylinder (16) is operated, the drive box (8) slides in parallel with the base frame (1).

An auxiliary arm (12) is swingably attached to the drive shaft (13), and is pivotally attached to one end of a bracket (9). The unloader frame (2
3), and a cam plate (10) above it
Are installed, and the arc-shaped cam groove (11) is
0), and a cam follower (14) of the bracket (9) pivotally attached to the tip of the auxiliary arm (12) has the cam groove (1).
Rollably fits in 1).

A main arm (15) is attached to the bracket (9), and a gripping mechanism (15a) is provided at the tip of the main arm (15) so as to grip the biscuit (24a) of the product (24). . As shown in FIG. 2, the gripping mechanism (15a) is composed of two upper and lower arms (15b) (15c) whose distance is enlarged and reduced. The reversing mechanism (2
2) is equipped to rotate the main arm (15) around the axis.

The auxiliary arm of the transport path of the products (24) in FIG. 3 (K) and the automatic product take-out machine (B) (12), the cam follower shows the movement relationship (14), 10 products (24) , "-10" is the movement locus of the center of the gripping mechanism (15a), and "-10" is the movement locus of the cam follower (14). This product (24)
One or a plurality of product confirmation sensors (S) are installed at appropriate places in the movement trajectory (K) as needed. The type of the product confirmation sensor (S) may be any type of sensor as long as it can confirm the passage of the product (24). In this embodiment, a photoelectric tube switch and a limit switch are used.

On the die casting machine (A) side, when the casting is completed and the molten metal in the molds (5) and (6) solidifies, the mold is opened. The product (24) is a moving mold (5) in this embodiment.
Adhered to the side and peeled from the fixed mold (6), the moving mold
The biscuit (24a) projects from the parting surface of (5). When the mold opening is completed as described above, the automatic product unloading device (B) operates.

After transferring the product (S), the main arm (15)
The main arm (15) located at a position 10 'which is in a standby state until the next cycle operation is started (here, coincides with the product transfer position, hereinafter, referred to as a standby position) is connected to the drive shaft (13). With rotation, it moves to the mold (5) (6) side to 10 '~'. During this time, the cam follower (14) is guided in the cam groove (11).
Move to 10 '' ~ ''. The posture of the main arm (15) is determined by the cam follower (14) and the operating shaft (17) of the bracket (9). When the main arm (15) reaches the position of 'or before reaching, the gripping mechanism (15a) is operated to expand the arms (15b) and (15c), and to grip the biscuit (24a) of the product (24). Be prepared. Next, pull out cylinder (16)
To move the main arm (15) toward the movable mold (5), close the arms (15b) and (15c) at the limit of forward movement, and
Grab 4a).

In this state, when the eject mechanism (20) is operated and the drawing cylinder (16) is retracted, the biscuit (24a) is gripped by the arms (15b) (15b), and the product (24) is moved. It is pulled out from the moving mold (5). When the withdrawal of the product (24) is completed, the drive shaft (13) is rotated in the reverse direction. As a result, the product (24) returns to the standby position 10 by following the trajectory of ~ 10. During this time, the product (24) passes through the sensing position of the product confirmation sensor (S). By sensing this, it is confirmed that the product (24) has been removed from the movable mold (5).
When the product (24) reaches the standby position 10, the main arm (15) stops, and then the reversing device (22) is operated to activate the main arm (1).
When the product (24) is turned downward by rotating 5) by 90 ° and the arms (15b) and (15c) are opened in this state, the product (24) falls. Product (2
When 4) is dropped, the reversing device (22) is reversed again to return the main arm (15) to its original position, and waits for a start command for the next cycle.

On the other hand, on the die casting machine (A) side,
When the removal of (24) is confirmed, it is guaranteed that there is no product (24) in the moving mold (5).
(5) The spraying work for cleaning the parting surface in (6) starts. After the cleaning of the parting surfaces of the molds (5) and (6) is completed, the mold is closed again, and then the molten metal is injected into the mold cavity.

The above operation is repeated and the die-casting operation proceeds. The on / off operation is repeated every time the product (24) passes through the sensing area of the product confirmation sensor (S). The number of passes of the product (24) is very large, and the product confirmation sensor (S) such as a photoelectric tube switch or a limit switch gradually deteriorates during use and causes a failure,
The contact may burn and continue to emit an ON signal. In such a case, although the product (24) has not passed, the die casting machine (A) determines that the product (24) has been taken out of the moving mold (5) and proceeds to the next cycle. Switch and perform mold closing. As a result, if the product (24) remains in the moving mold (5), the product (24) may be pressed to damage the molds (5) and (6), or in the worst case, may cause personal injury. become.

Therefore, in the present invention, the following sequence is incorporated in the sensing circuit to immediately detect breakage of the product confirmation sensor (S), thereby preventing the above-described accident due to product confirmation error. Although the description partially overlaps with the already described portion, it will be described in detail with reference to FIG.

When the mold opening is completed (S1), the automatic product unloading machine
The main arm (15) of (B) advances to the mold (5) (6) side (S2),
The biscuit (24a) of the product (24) is chucked (S3). Next, the product (24) is pulled out of the movable mold (5) (S4), and the main arm (15) is retracted toward the standby position 10 while holding the product (24) (S5). During that time, it passes through the sensing area of the product confirmation sensor (S). When passing through the sensing area of the product confirmation sensor (S), the product confirmation sensor (S) is turned on at the same time as sensing the product (24) (S6), and is turned off when the product (24) passes (S7). Products that passed the product confirmation area (24)
Moves to the standby position 10 (S8), and the product (24)
Is dropped (S9).

When the main arm (15) reaches the standby position 10 and stops, it is checked whether or not the product confirmation sensor (S) is on (S10). If the product confirmation sensor (S) is turned off at this time, the operation of the product confirmation sensor (S) is normal, and it is checked whether the mold opening of the next cycle is completed (S11). If the cycle opening is completed, the process returns to the start.

If the mold opening of the next cycle has not been completed yet,
Wait for mold opening completion. When the product confirmation sensor (S) is on, the product confirmation sensor (S) may be faulty or temporarily on for some reason. If so, the vibration check timer (not shown) is turned on, and it is sensed whether or not the product confirmation sensor (S) is kept on for a predetermined time (here, 0.5 to 1 second) ( S12).

If the product confirmation sensor (S) is turned off while the vibration check timer is on, it is determined that the product confirmation sensor (S) is normal, the vibration check timer is cleared, and the mold opening in the next cycle is completed. wait. Conversely, if the product confirmation sensor (S) is on for the duration of the vibration check timer and the product confirmation sensor (S) is on even after the time expires, it is determined that the sensor is defective and an alarm is issued. Stop the machine operation. In this way, by providing a vibration check timer and checking whether the product confirmation sensor (S) remains on after the check time elapses, the malfunction of the product confirmation sensor (S) can be detected immediately. In addition, accidents due to sensor failure are prevented beforehand.

[0026]

According to the present invention, a predetermined time after the product arrives at the standby position is set as the check time by the vibration check timer, and the product confirmation sensor is kept on even after the check time has elapsed. By checking whether or not there is a malfunction, the malfunction of the product confirmation sensor is immediately detected, and an accident based on the malfunction of the sensor is prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a plan view of a molding machine with an automatic product take-out device according to the present invention.

FIG. 2 is a right side view of a main part of FIG.

FIG. 3 is a plan view showing a trajectory in a product removal state according to the present invention.

FIG. 4 is a flowchart of the present invention.

[Explanation of symbols]

 (A)… Molding machine (B)… Product unloading machine (S)… Product confirmation sensor (24)… Product

Claims (2)

(57) [Claims] 1. A product take-out step of taking out a product from a molding machine by a product take-out machine, checking whether or not the product has been taken out by a product confirmation sensor during transfer to the product transfer position, and transferring the product to the product transfer position. After the product reaches the transfer position, the on / off state of the product confirmation sensor is detected. If the product confirmation sensor is off, the product confirmation sensor is determined to be normal, and the product confirmation sensor is turned on. In the case of the state, it is detected whether the product confirmation sensor is switched off during a certain time, and if the product confirmation sensor is switched off during a certain time, it is determined that the product confirmation sensor is normal, A method for checking a product confirmation sensor of a molding machine, wherein a sensor failure is determined when the on state is maintained after a lapse of a predetermined time. 2. A product collection for taking out a product from a mold of a molding machine.
The delivery machine and the product taken out of the mold
It is arranged in the transfer path until it reaches the
Product confirmation center to confirm that the
After the product reaches the transfer position,
Product on / off status, and the product confirmation sensor turns off.
The product confirmation sensor is normal,
If the product confirmation sensor is on, the product
Detects whether the confirmation sensor switches off and
If the product identification sensor switches off during the time
Has judged that the product confirmation sensor is normal,
If the on state continues afterwards, it is determined that the sensor is defective
It has a check function for product confirmation sensors that
Product removal equipment for molding machines.