JP3017575U - Die stop stopper - Google Patents

Abstract

(57) [Abstract] [Purpose] Prevent the malfunction of the automatic unloader for molded products and automatic inserter, and prevent damage to the mold by making the mold opening stop position of the injection molding machine etc. the same every cycle. To do. [Structure] A stopper which is provided with a locking portion for allowing a screw rod to be slidable and fixed at an arbitrary desired position on a movable plate, and the stopper surface of the screw rod being provided on a mold clamping cylinder at a mold opening stop position. Try to stop it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device for ensuring a constant mold opening stop position in a mold clamping device such as an injection molding machine.

[0002]

[Prior art]

 There are drive systems such as direct pressure type, toggle type, and servo motor type for mold clamping devices such as injection molding machines, and the mold opening / closing position is controlled by driving each when the mold position reaches a predetermined position. This is done by cutting off power.

[0003]

[Problems to be solved by the device]

 In this case, it is necessary to apply the brake effectively after the drive force for opening the mold is cut off.However, in the case of the direct pressure type, the drive source is a hydraulic cylinder and the brake is generally not forced to be applied. Stops due to frictional resistance such as cylinder packing. Therefore, the operation stop position of the hydraulic cylinder is affected by the temperature of the hydraulic oil, the wear state of the packings, or the processing time of the control device, and the mold stop position does not become constant for each cycle.

As a result, when the peripheral equipment that approaches the movable mold from the outside of the movable plate at the mold opening stop position, such as the molded product automatic take-out device or the automatic insert device, the mold opening stop position is displaced by several mm. As a result, the molded product may not be taken out or the insert part may not come out of the set. Also, if a chain or rod is provided between the movable mold and the fixed mold to take out molded products or sprues, and the mold opening stop position becomes farther from the specified position to the mold opening side, It will damage the mold.

[0005]

[Means for Solving the Problems]

 Therefore, a pedestal fixed to the movable plate of the injection molding machine and having a semicircular groove for guiding the screw rod in the mold opening / closing direction and a shaft provided in the mold opening / closing direction near one end of the pedestal are used for rotation. A split nut that is movably connected, a screw rod having a male screw that meshes with a semi-female screw provided on the split nut, and the other end near the shaft of the pedestal and the semicircular groove. The tightening bolt that integrally fastens the split nut and the screw rod screwed to the split nut to the pedestal, and the screw rod of the screw rod when the movable plate reaches a predetermined mold opening stop position. A die opening stop stopper is used which consists of an impact surface and an impact material provided on the die clamping cylinder so as to prevent impact.

[0006]

[Action]

 In the die opening stopping device as described above, the die-opening movement of the movable plate is forcibly stopped by the impact surface of the screw bar on the movable plate impacting the stopper material of the fixed platen. Therefore, the mold opening stop position is surely made constant. Also, when changing the mold opening stop position, the projection amount of the screw rod on the side of the stopper material is changed according to the mold opening stop position.The operation at that time is to rotate the split nut and remove it from the screw rod. The screw rod slides on the semi-circular groove of the pedestal to move it by a desired amount, and the split nut is screwed onto the screw rod again, and then it is fastened to the pedestal with the tightening bolt.

[0007]

【Example】

 Next, embodiments will be described in detail with reference to the drawings. FIG. 1 is a perspective view when the present invention is applied to a direct pressure type mold clamping device of an injection molding machine. Reference numeral 1 denotes a mold clamping cylinder, in which a ram 2 fixed to a movable platen 3 is fitted and inserted between a movable mold 8 attached to the movable platen 3 and a fixed mold 9 attached to a fixed platen 4 by hydraulic pressure. Give power. Reference numeral 5 denotes a plurality of tie bars, which connect the mold clamping cylinder 1 and the fixed platen 4 to receive a mold clamping force and allow the movable platen 3 to slide. 6 is a safety cover, which is fixedly installed on the base of the mold clamping device to prevent the vicinity of the mold clamping cylinder from coming into contact with a movable object to ensure the safety of the human body. A safety door 7 is movable in the mold opening / closing direction. When closing, the fixed platen 4 and the movable platen 3 are separated from the human body, and when released, the mold can be easily accessed to take out the molded product. And mold maintenance.

Reference numeral 10 denotes a stopper member provided on a side surface of the mold clamping cylinder, and an stopper surface 17 which is an end surface of a screw rod 11 provided on a side surface of the movable plate 3 via a locking portion 18 and a mold opening / closing direction. I try to stop on a vertical plane. The stopper 10 may be cast integrally with the mold clamping cylinder, or may be fixed to the mold clamping cylinder as a separate member. Details of the locking portion 18 that allows the screw rod 11 to be slidable and fixed at a desired position are shown in FIGS. 2 and 3.

The pedestal 13 is fixed to the movable platen 3, has a semicircular groove 13 a and a shaft 15 in the mold opening and closing direction, and the semicircular groove 13 a of the shaft 15 provided near one end surface of the pedestal 13 A female screw 13b to be screwed with the tightening bolt 14 is provided near the other end face separated by. The split nut 12, which is rotatable via the shaft 15, has a semi-female screw 12a, and when the split nut 12 is rotated so as to approach the receiving base 13, the semi-female screw 12a is the screw rod. 11 is screwed together. Further, a through hole 12b into which the tightening bolt 14 is loosely fitted is provided at a relational position where the tightening bolt 14 is screwed with the female screw 13b of the pedestal 13. The type of male screw of the screw rod 11 may be any of a mountain shape, a saw tooth, a trapezoidal shape, a square shape, and the like.

Reference numeral 16 denotes a guide member, which is a member having a through hole into which the screw rod is inserted and fixed to the side surface of the movable plate so as to guide the screw rod slidably in the mold opening / closing direction. In the present embodiment, the locking portions 18 are provided side by side, but they may be provided separately from the locking portions 18, or a plurality of them may be appropriately provided.

Next, a method of adjusting the screw rod 11 will be described. First, the movable platen is stopped at a desired mold opening stop position, and a limit switch (not shown) is set so as to issue a mold opening stop signal at that position or a few mm before the mold closing side at that position. Next, the safety door 7 is released, the tightening bolt 14 of the locking portion 18 is loosened and pulled out from the female screw 13b, and then the split nut 12 is rotated to release the screw engagement with the screw rod 11. The screw rod 11 slides to move the stopper surface 17 so as to contact the stopper member 10. Then, the split nut 12 is rotated to engage with the screw rod 11, and the tightening bolt 14 is lightly tightened. Rotate the screw rod 11 by hand to check the contact with the stopper. Tighten the tightening bolt 14 firmly with a tool or the like.

[0012]

[Effect of device]

 Since the mold opening stop device of the present invention is constructed and operates as described above, the mold opening stop position is surely guaranteed to be in the same position, and the malfunction of the molded product automatic take-out device or the automatic insert device or the mold It can be prevented from being damaged and can be operated easily by only opening the safety door.

[Brief description of drawings]

FIG. 1 is a perspective view when the present invention is applied to a direct pressure type mold clamping device of an injection molding machine.

FIG. 2 is a side view of the locking portion when the split nut and the screw rod are not screwed and unlocked.

FIG. 3 is a side view of a locking portion when the split nut and the screw rod are screwed together and locked.

[Explanation of symbols]

 1 Clamping Cylinder 3 Movable Plate 4 Fixed Plate 7 Safety Door 10 Stopper Material 11 Screw Rod 12 Split Nut 12a Half Female Screw 12b Through Hole 13 Catch 13a Semicircular Groove 13b Female Screw 14 Tightening Bolt 15 Shaft 16 Guide Material 17 Stop surface 18 Locking part

Claims (1)

[Scope of utility model registration request] 1. A pedestal fixed to a movable plate of an injection molding machine and having a semicircular groove for guiding a screw rod in the mold opening / closing direction, and a shaft provided in the die opening / closing direction near one end of the pedestal. A split nut that is rotatably connected to the split nut, a screw rod having a male screw that engages with a half female screw provided on the split nut, and the other end that separates the shaft of the pedestal from the semicircular groove. And a tightening bolt for integrally fastening the split nut and a screw rod screwed to the split nut to the pedestal in the vicinity of a portion, and the screw rod of the screw rod when the movable plate reaches a predetermined mold opening stop position. A mold opening stop stopper comprising an stopper surface and an stopper provided on the mold clamping cylinder so as to stop the stopper.