JPH052935U - Stopper device for safety door of injection molding machine - Google Patents

Abstract

(57) [Summary] [Purpose] The safety door of an injection molding machine is designed to prevent people from closing it while working inside the machine to improve safety. In a slide type safety door of an injection molding machine, the safety door is provided below the safety door, and a stopper lever 33 is fixed inside the door and a manual lever is fixed outside the door. The rotatable horizontal shaft 32, the stopper block 37 attached to the guide rail 38 of the safety door 21, and the stopper lever 33 of the horizontal shaft 32 when the safety door 21 moves in the opening direction. When it hits the stopper block 37 and rotates to get over the stopper block 37 and goes backward in the closing direction of the safety door 21, the stopper pin 33 is held in the vertical position to stop the advance of the safety door. Be prepared.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a safety door stopper device that can be used as a safety device that prevents the safety door from freely closing during work such as mold maintenance of an injection molding machine.

[0002]

[Prior Art]

 The safety door for the injection molding machine is provided to protect the operator's body from opening and closing movements of the mold. Normally, when the safety door is open, the movable platen will not move forward (close). A mechanical, hydraulic or electrical forward restraint mechanism is built into the door. Of these three restraint mechanisms, a conventional example relating to a mechanical mechanism will be described with reference to FIGS. 4 to 8. Reference numeral 1 denotes a movable die plate, and a stopper 6 is provided on a side surface of the movable die plate. Has a notch 6a that allows the stopper plate 3, the bracket 4, and the nut retainer 5 to move forward and backward without interfering with the stopper nut 3, the bracket 4, and the nut retainer 5 when the stop plate 2 swings and its swing end is lowered. Have. Further, when the swinging end of the stop plate 2 is raised, the stopper 6 interferes with the stop plate 2 so that the movable platen 1 cannot move forward any further.

The base end of the stop plate 2 is rotatably fixed to the swing rod 7 rotatably supported on the front surface of the brackets 4 and 4a fixed to the base, and is supported so as to be movable in the horizontal direction. Has been done. For example, the swing rod 7 is a hexagonal rod, and a hexagonal hole to be fitted into the stop plate 2 is formed at the base end of the stop plate 2. The stop plate 2 is constantly pushed upward by the compression spring 14, and the stop plate 2 prevents the stopper 6 from moving forward when the safety door 21 is open. The stopper nut 3 is screwed onto a safety rod 8 made of a threaded rod, and when the safety rod 8 is rotated, the stopper nut 3 is moved in the axial direction of the rod 8. The retainer 5 is fixed so that co-rotation due to rotation of the safety rod 8 is prevented.

The brackets 4 and 4 a are fixed to the base 10, respectively, and rotatably support the safety rod 8 via a bearing 9. Further, the nut retainer 5 is formed with a through hole 11 sufficient to allow the swing rod 7 to freely rotate, so that the nut 3 does not rotate with the safety rod 8 but can move in the axial direction of the safety rod 8. There is. A bracket 17 having a concave shape is attached to the side surface of the nut retainer 5, and a stop plate 2 is inserted between the nut retainer 5 and the bracket 17. The upper and lower rocking guide gaps are formed.

As shown in FIGS. 7 and 8, the swing rod 7 is a hexagonal rod that swings by a cam mechanism 22 in conjunction with a safety door 21, and a bear ring unit 12 fixed to the end surfaces of the brackets 4 and 4 a. It is rotatably held by. Both ends of the safety rod 8 are rotatably supported by brackets 4 and 4a, and are connected to a handle 13 by a key or the like (not shown). By rotating the handle 13, the nut 3 can be moved. It is like this. Further, 15 is a proximity body, and 16 is a proximity switch.

FIG. 3 shows the overall structure of the injection molding machine. Reference numeral 20 denotes a fixed mold plate for fixing the fixed mold of the mold, which is paired with the movable mold plate 1. 26 is a support for the safety door 21, 27 is a fixed mold, 28 is a movable mold, and both molds form a molding die. A cam mechanism 22 is adopted as a mechanism for swinging the swing rod 7 in association with opening and closing of the safety door 21. According to this cam mechanism 22, when the safety door 21 is closed, the cam 23 pushes down the rod 24 to rotate the lever 25 in the direction of arrow D in FIG. The lever 25 is fitted into the swing rod 7 with a hexagonal hole to rotate the swing rod 7. On the contrary, when the safety door 21 is opened, the swing rod 7 itself has a rotational force opposite to the arrow D by the compression spring 14, so that the rod 24 is raised. The support base 26 supports a sliding portion when the safety door is opened and closed, and also serves as a guide portion when the rod 24 is moved up and down.

[0007]

[Problems to be solved by the device]

 In the injection molding machine in operation, as a safety measure for the work of opening the mold and peeling off the product that has eaten into the mold, and removing the scraps of the material, while the safety door 21 is open, A mechanical safety device and a means to prevent the movable platen from moving in the closing direction by operating a control circuit for electricity, hydraulic pressure, etc. by a confirmation signal from a sensor for opening the door are provided, but it is a large injection. In a molding machine, it is necessary for an operator to enter the machine to work, and the safety door 21 is often closed under the following conditions.

That is, since the safety door is opened vigorously, it hits strongly at the stop position, and the door is closed by its reaction. Moreover, the safety door may be gradually closed due to the vibration of the machine, or it may be closed due to the carelessness of a third party. As described above, in the conventional device, when the safety door is closed without the operator's intention, all the safety devices are released, and the movable platen may start moving, which may cause an unexpected situation. The present invention has been proposed to solve the above conventional problems.

[0009]

[Means for Solving the Problems]

 Therefore, the present invention provides a slide type safety door of an injection molding machine, which is provided below the safety door and penetrates through the safety door. A stopper lever is provided inside the door and a manual lever is provided outside the door. When the safety horizontal door is fixed, the stopper block is attached to the guide rail of the safety door, and the safety door opens, the stopper lever of the horizontal axis hits the stopper block and rotates. It is equipped with a stop pin that keeps the stopper lever in a vertical position and stops the safety door from moving forward when it goes over the stopper block and goes backward in the direction in which the safety door closes. It is a means for solution.

[0010]

[Action]

 In the present invention, in addition to various safety devices that confirm the opened state of the safety door and temporarily stop the mold clamping operation, the reverse travel stop device is added to the safety door to aim for further safety. That is, a horizontal rotary shaft that penetrates the inside and outside of the door is provided below the safety door, and a stopper lever is fixed to the inner end of the coaxial door and a manual lever is fixed to the outer end of the door, thereby enabling the same horizontal rotation. The shaft rotates freely in a bearing fixed to the door. When the door is opened, the stopper lever rotates freely even if it hits the stopper block fixed on the guide rail of the door, but it freely rides over, but when the door moves in the closing direction, the stopper lever does not rise vertically. While standing, hit the stopper block to stop the door.

As described above, when the safety door is opened, even if the stopper lever of the stopper device hits the stopper block fixed to the machine base side, the stopper lever rotates to escape and pass through the upper surface of the stopper block. After passing the stopper block, the stopper lever is vertical. Next, when the safety door moves in the closing direction, the stopper pin beside the stopper lever keeps the stopper lever in vertical contact with the stopper block to stop the safety door. When the worker finishes the work around the mold and returns to the injection molding process, move the safety door slightly in the opening direction and rotate the stopper lever with the manual lever outside the safety door to avoid the stopper block. Close the safety door.

[0012]

【Example】

 The present invention will be described below with reference to the embodiments of the drawings. FIGS. 1 and 2 show an embodiment in which a safety door stopper device of the present invention is attached to a worker-side safety door of an injection molding machine. FIG. 1 is a perspective view of the safety door stopper device, FIG. 2 is a side view of the periphery of the safety door to which the stopper device 30 is attached, and FIG. 3 is a side view of the entire injection molding machine. The position where it was placed is shown.

In FIG. 1, the mounting base 31 of the stopper device 30 is integrally formed with a bearing 31a, and the horizontal shaft 32 is fitted into the bearing 31a so as to be freely rotatable. A stopper lever 33 is fixedly attached to the end of the horizontal shaft 32, and a manual lever 34 is fixedly attached to the other end. That is, the stopper lever 33 can be rotated by the manual lever 34 as shown by arrows A and B. The stopper lever 33 is restrained on one side by a stop pin 35 in the vertical position.

Further, the rotation of the stopper lever 33 is restricted by the holding pin 36 so that the stopper lever 33 does not rotate more than necessary. On the other hand, the stopper device 30 is mounted and fixed to the stopper mounting plates 21b and 21c below the safety door 21 by a mounting base 31 constituting the stopper device 30. Further, the horizontal shaft 32 projects from the hole 21a of the safety door 21 to the outside of the door, and the manual lever 34 is fixed to the tip thereof as described above. A wheel shaft 40 is mounted on the stopper mounting plate 21b of the safety door 21, and a wheel 39 is fitted on the shaft of the wheel shaft 40. Further, the safety door 21 is moved by wheels 39 on a guide rail 38 fixedly mounted on a safety door support 26 (FIG. 2A) attached to the base of the injection molding machine. A stopper block 37 is fixedly mounted on the guide rail 38.

Next, the operation will be described. FIG. 2A shows a position where the safety door 21 is closed, and FIG. 2B shows a position where the safety door is opened. Further, in the free state, the stopper lever 33 is rotated by the weight of the manual lever 34 as shown in the drawing (as shown by the solid line in FIG. 1) and is rotated clockwise in FIG. The vertical state is maintained. When the safety door 21 is opened, the lower portion of the stopper lever 33 hits the stopper block 37 on the guide rail 38 at the fully opened position, and the stopper lever 33 is pushed up (indicated by the chain double-dashed line in the direction of arrow A in FIG. 1). 2), the stopper lever 37 is moved over to the position shown in FIG. 2A, and the stopper lever 33 is vertically lowered again.

Next, even if the safety door 21 is moved in the closing direction, that is, in the rightward direction in FIG. 2A, the stopper lever 33 is stopped by the stop pin 35. It cannot be moved to the right. In order to close the safety door, the safety door 21 is moved slightly to the left as shown in FIG. 2B, the manual lever 34 is turned in the direction A of FIG. 1, and the stopper lever 33 is moved above the stopper block 37. The safety door 21 can be closed by flipping it up and moving the safety door 21 to the right.

[0017]

As described above in detail, according to the present invention, the safety of the injection molding machine can be further improved by the stopper device of the safety door. In other words, as the size of the injection molding machine has increased, workers have more opportunities to enter the machine due to work around the mold in operation, but the worker closes due to the recoil when the safety door opens during work inside the machine. Also, it is possible to prevent it from being closed by mechanical vibration or being inadvertently closed by a third party, thus improving safety.

[Brief description of drawings]

FIG. 1 is a perspective view of a safety door stopper device of an injection molding machine according to an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the safety door stopper device in FIG.

FIG. 3 is a side view showing an entire general injection molding machine.

FIG. 4 is a perspective view of a mechanical safety device of a conventional injection molding machine.

5 is a sectional view taken along line CC of FIG.

6 is a sectional view taken along line EE of FIG.

FIG. 7 is a view taken along arrows F to F in FIG.

FIG. 8 is a view on arrow G in FIG.

[Explanation of symbols]

 21 Safety Door 32 Horizontal Axis 33 Stopper Lever 34 Manual Lever 35 Stop Pin 37 Stopper Block 38 Guide Rail

Claims (1)

[Claims for utility model registration] [Claim 1] In a slide type safety door of an injection molding machine, the safety door is provided below the safety door, the stopper door is provided inside the door, and the stopper lever is provided outside the door. Is a rotatable horizontal shaft to which each manual lever is fixed, a stopper block attached to the guide rail of the safety door, and the stopper lever of the horizontal shaft when the safety door is opened. It is equipped with a stop pin that keeps the stopper lever in a vertical position to prevent the safety door from moving when it hits the stopper block, rotates over the stopper block, and goes backward in the closing direction of the safety door. Stopper device for safety door of injection molding machine.