JPH0235396Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a device for attaching and detaching a tie bar attached to a die fixing platen in a die casting machine.

(Conventional structure and its problems) Usually, in the case of a die casting machine, as shown in Fig. 5, a plurality of core-extracting cylinders c are attached to a mold b attached to a fixed platen a. Therefore, when attaching mold b to fixed platen a, it is necessary to remove a specified tie bar d, but this removal work has traditionally been done manually, making it difficult and time-consuming. There was a problem in that even when the tie bar d was to be reattached to the fixed platen a, it could not be done smoothly and accurately.

(Purpose of the invention) The present invention solves the above-mentioned problems and provides a tie bar attachment/detachment device for a die-casting machine that allows the tie bar to be automatically and smoothly attached to/detached from a fixed platen.

(Structure of the invention) In order to achieve the above object, the tie bar attaching/detaching device in the die casting machine of the present invention is designed to move a tie bar fixing nut body, which has a gear carved on its outer circumferential surface, back and forth by a certain distance in a fixed platen. At the same time, the tip of the tie bar was removably screwed onto this nut body, and the nut body was made rotatable via a meshing gear by a motor attached to a fixed plate, and was also placed at an appropriate position on the fixed plate. The end surface of the lock screw, which moves forward and backward by the operation of the cylinder, is brought into contact with the end surface of the tie bar, and a cylinder that presses the end surface of the nut body is disposed on the fixed plate, and when the lock screw is loosened. Later, by driving the motor to rotate, the rotation is transmitted to the nut body to move the tie bar in the axial direction, making it possible to remove the tie bar from the stationary platen, and when installing the tie bar, the nut body is used to operate the cylinder. Therefore, the tie bar can be smoothly attached by rotating the motor in the opposite direction while actively pressing against the end face of the tie bar.

(Explanation of Embodiment) An embodiment of the present invention will be explained with reference to the drawings.
Reference numeral 1 denotes a mold fixing plate, and the ends of tie bars 2 are attached to the four corners of the plate as shown in FIG.

Among these tie bars 2, for example, the tie bar 2 at the upper left corner is detachably attached by a mechanism as described below.

Reference numeral 3 denotes a hole for fitting the tie bar 2 provided in the fixed platen 1, and a nut body installation hole having a diameter larger than the fitting hole 3 is provided in the fixed platen 1, communicating with the fitting hole 3 on the same center line. A gear 5 is carved into the outer periphery of the rear end of the hole 4, and a nut body 7 that is screwed into the threaded portion 6 provided at the end of the tie bar 2 is housed inside the hole 4.

Reference numeral 8 denotes a casing body integrally attached to the end face of the stationary plate 1 via a spacer plate 9, and a lock screw 10 is screwed into the casing body so as to be able to move forward and backward toward the nut body installation hole 4. As shown in the figure, a nut 12 and a lock arm 13 are attached to a lock cylinder 11 arranged at an appropriate position on a fixed platen 1.
They are rotatably connected via.

The nut body 7 is capable of sliding movement in the front-rear direction by a certain distance on the inner circumferential surface of the hole 4, and is regulated by contacting the outer circumferential surface of its front end with a circumferential step surface 14 formed at the front end of the hole 4, The rear outer peripheral end surface is brought into contact with the spacer plate 9 to prevent rearward movement.

Reference numeral 15 denotes an oil motor fixed at a proper position on the front side of the spacer plate 9, and a pinion gear 16 fixed to the rotating shaft is connected to the gear 5 of the nut body 7 via an idler gear 17, as shown in FIG.
It is meshed with.

18 is an air cylinder for pressing the nut body mounted on the casing 8 facing the end face of the nut body 7;
As shown in FIG. 4, the tip end surface of the rod projects into the rear part of the nut body installation hole 4 and comes into contact with the outer peripheral end surface of the nut body 7.

A striker 19 for a tie bar position limit switch is mounted on the casing 8 facing the end face of the tie bar 2, and is always urged forward by a spring 20, with its tip protruding into the hole 4 and at the rear. The end portion is configured to be retractable from the rear side of the casing 8.

21 and 22 are a first limit switch and a second limit switch attached to the rear surface of the casing 8, and the first limit switch 21 is connected to its operating piece 23.
is projected onto the movement path of the rear end of the striker 19, and the second limit switch 22 has its operating piece 24 in elastic contact with the outer peripheral surface of a cam disk 25 fixed to the end of the rotation shaft of the oil motor 15. .

To describe the operation of the tie bar attaching/detaching device configured as above, when detaching the tie bar 2,
First, after operating the lock cylinder 11 and loosening the lock screw 10, when the oil motor 15 is rotated, the rotation is transmitted to the gear 5 of the nut body 7 via the idler gear 17.
is screwed back and its rear end surface contacts the spacer plate 9, and when the nut body 7 is further rotated from this state, the tie bar 2 screwed onto the nut body 7 with the spacer plate 9 as a support surface supports the rotation of the nut body 7. It is sent forward by the nut body 7, and can be removed from the fixed platen 1.

Next, to attach the tie bar 2 to the fixed platen 1,
First, the end of the tie bar 2 is inserted into the insertion hole 4 of the fixed platen 1 by a hydraulic cylinder (not shown) disposed at an appropriate position of the die-casting machine, and the tie bar 2 is inserted until the end surface contacts the nut body 7. Then, the air cylinder 18 is actuated to bring the tip end surface of the rod into contact with the outer peripheral end surface of the nut body 7, thereby pressing the nut body 7 against the tip surface of the tie bar 2.

Then, when the oil motor 15 is rotated in the opposite direction to the direction in which the tie bar was removed, the nut body 7 rotates and its threaded hole is screwed into the tip threaded portion 6 of the tie bar 2, and from this state the nut body 7 is removed. The front end surface is screwed forward until it comes into contact with the circumferential step part 14.

When the nut body 7 contacts and is received by the circumferential part 14 and rotates further, the tie bar 2 is drawn into the fixed platen 1 while being screwed into the nut body 7, and its end surface is brought into contact with the tip of the striker 19. This causes the striker 19 to slide rearward against the force of the spring 20.

In this way, as the tie bar 2 is pulled in, the striker 19 retreats, and when it reaches the fully retracted position, the rear end of the striker 19 comes into contact with the operating piece 23 of the first limit switch 21, and the limit switch 21 is activated. Further, the cam surface 26 of the cam disk 25 fixed to the end of the rotating shaft of the oil motor 15 is connected to the actuating piece 24 of the second limit switch 22.
When this is reached, an oil motor stop signal is issued and the oil motor 15 is stopped, and at the same time the lock cylinder 11 is operated and the lock screw 10 is threaded to complete the locking of the nut body 7 to the tie bar 2.

(Effects of the invention) As described above, according to the tie bar attaching/detaching device in the die casting machine of the present invention, there are
A nut body 7, which is screwed into the threaded end portion of the tie bar 2, is arranged so as to be able to move back and forth by a certain distance, and the end surface of the lock screw 10, which moves back and forth by the operation of the cylinder 11, is pressed against the end surface of the tie bar 2. Therefore, in normal conditions, the tie bar 2 can be firmly fixed to the nut body 7, and the gear 5 provided on the outer peripheral surface of the nut body 7 can be fixed firmly.
is rotated by the motor 15 via the meshing gear 17, so by rotationally driving the motor 15, the nut body 7 can be rotated and the tie bar 2 can be smoothly separated from the fixed plate 1. It is something.

Furthermore, according to the present invention, since the fixed platen 1 is provided with the cylinder 18 that presses the end face of the nut body 7, the nut body 7 is positively pressed against the end face of the tie bar when the tie bar 2 is installed. state,
If the nut body 7 is rotated in this state, the tie bar 2
can be easily screwed into the nut body 7 and the tie bar 2 can be pulled in smoothly and reliably.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention: Fig. 1 is a longitudinal side view thereof, Fig. 2 is a rear view, Fig. 3 is a simplified diagram of the rotation transmission mechanism, and Fig. 4 is a longitudinal sectional view of the striker and air cylinder portion. The side view and FIG. 5 are simplified front views of the mold fixing plate. 1...Fixed plate, 2...Tie bar, 5...Gear,
7...Nut body, 10...Lock screw, 11,1
8...Cylinder, 17...Meshing gear.

Claims (1)

[Scope of utility model registration request] A tie bar fixing nut body 7 having a gear 5 carved on its outer circumferential surface is disposed within the fixed platen 1 so as to be movable back and forth by a certain distance, and the tip of the tie bar 2 is removably screwed into this nut body 7. The nut body 7 is made rotatable by the motor 15 attached to the fixed platen 1 via the meshing gear 17, and the tip surface of the locking screw 10 is moved forward and backward by the operation of the cylinder 11 disposed at the appropriate position on the fixed platen 1. A tie bar attaching/detaching device for a die-casting machine, characterized in that a cylinder 18 is pressed against the end face of the tie bar 2 and further includes a cylinder 18 disposed on the stationary platen 1 for pressing the end face of the nut body 7.