JPH0228038Y2 - - Google Patents

Description

[Detailed description of the invention] [1] Technical field This invention is a method for removing molded products from an injection molding machine,
This article relates to a safety step device used for inspection and maintenance of molds, etc.

[2] Prior art In order to ensure worker safety, the mold clamping device of an injection molding machine is provided with a safety door on the operating side, and the mold is prevented from closing while the safety door is open. . In the case of a small machine, there is no problem because you can take out the molded product and perform other operations without entering the inside of the machine, but in the case of a large machine and the molded product is large, the inside of the safety door, that is, the fixed die plate and the movable die plate, is not a problem. A worker enters between each molding cycle to remove and inspect the molded product. In this case, in addition to the safety gate, as already known in Japanese Utility Model Publication No. 45-30624, safety devices include the movement of the movable die plate between the fixed die plate and the movable die plate when the mold is opened and closed. A treadle is provided at the bottom center of the moving die plate so as not to interfere with the plate, and when a predetermined weight is applied to this treadle, a limit switch is activated, cutting off the mold clamping circuit and locking the movement of the moving die plate in this state. I was thinking about safety. Since the mounting position of this step board is lower than the tie bar, the operator has to step over the tie bar to enter and exit each molding cycle, which requires labor and makes the work difficult. In addition to this, there is also a conventional device in which the width of the tread is smaller than the minimum mold thickness dimension and is installed at the bottom of the mold, but in this case, the tread width is narrow and
It had drawbacks such as very poor workability as it was directly under the mold.

[3] Purpose of the invention The present invention eliminates the drawbacks of the conventional equipment as described above, improves workability, and allows work such as removing molded products, inspection, and maintenance of molds to be performed easily in a safe and stable condition. To provide a safety step board device in which the step board is moved by a cylinder, eliminates the shock at the time of starting, accelerates the opening/closing time of a mold, measures cycle up, and enables molded products to be taken out in a shorter time.

[4] Structure of the invention A step plate for removing the molded product is provided horizontally on the upper part of the bed between the fixed die plate and the movable die plate, and the step plate is movable by a cylinder in synchronization with the mold opening/closing operation of the molding machine. It is a safety tread device.

[5] Embodiment An embodiment of the present invention will be described based on FIGS. 1 to 3. The safety tread 14 is located between the fixed die plate 11 and the movable die plate 12 and is connected to the tie bar 1.
3, which is installed horizontally on the top of the safety tread 14.
is adapted to move forward and backward in synchronization with the movement of the movable die plate 12 by the action of a hydraulic cylinder 15. Specifically, two arms 17 are raised from the operating side and the non-operating side of the bed 16, and a mounting member is provided for mounting the limit switch 18 on the upper part of the arm 17 so that the mounting position of the limit switch 18 can be adjusted in the longitudinal direction of the tie bar 13. 19 and a rail 20 that serves as a guide when moving the safety tread 14.
The limit switches 18 and 18a are fixed at two locations on the mounting member 19, namely, the safety tread 1.
It is installed to operate at the forward limit and backward limit positions of 4. The safety tread 14 is attached to the frame 21
A tread plate 22 is superimposed on the frame 21, and a compression spring 23 and a limit switch 24 are inserted between the frame 21 and the tread plate 22. Two legs 25 are provided on the operation side and the opposite operation side of the lower part of the frame 21, and a cam floor 26 is attached to the legs 25, so that the cam floor 26 receives the entire load of the safety tread 14 and rolls on the rail 20. It's summery. Further, on the opposite side of the frame 21, there is a dog 27 for operating the limit switches 18 and 18a.
is installed. Furthermore, a bracket 29 for connecting the rod 28 of the hydraulic cylinder 15 for moving the safety step board 14 is provided in the center of the frame 21 of the safety step board 14 (between the operation side and the non-operation side), and the bracket 29 protrudes from the bottom side. The rod 28 of the hydraulic cylinder 15 is connected to the lower end of the hydraulic cylinder 29 . The hydraulic cylinder 15 is attached to the lower center of the fixed die plate 11.

Next, to explain the action, when opening the mold,
Pressure oil flows into the A port of the hydraulic cylinder 15 in response to the backward signal of the movable die plate 12, causing the safety treadle 14 to move backward (move to the right in FIG. 1), and when the dog 27 operates the limit switch 18a, the A port is shut off. . Also, when the mold is closed, the moving die plate 1
2 forward movement signal causes pressure oil to flow into the B port of the hydraulic cylinder 15 to move the safety treadle 14 forward (to the left). At the forward limit, the limit switch 18 operates to shut off the B port. Therefore, as described above, the safety footboard 14 always moves in synchronization with the movable die plate 12. In addition, if the worker steps on the tread plate 22 or a load exceeding a predetermined level is applied, the tread plate 22 and the frame 22
The compression spring 23 inserted between the die plates 1 and 1 is bent, and the limit switch 24 is actuated to
An interlock circuit is designed to prevent movement.

In the embodiment, the hydraulic cylinder 15 is used to move the safety footboard 14, but the same effect can be obtained even if a pneumatic cylinder is used.

[6] Effects of the invention With this invention, by moving the safety tread with a cylinder, workability is improved and molded product removal, inspection, mold maintenance, etc. can be easily performed in a safe and stable state. Not only does it make work easier, but it also eliminates the need for a shock when starting up, allowing for smooth movement. As a result, the mold opening/closing time is shortened and the cycle-up is increased, while workability is improved and molded products can be taken out in a shorter time, which has remarkable effects.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a sectional view taken along the - line in FIG. 1, and FIG. 3 is a detailed view of the limit switch section. 11...Fixed die plate, 12...Movable die plate, 14...Safety step board, 15...Hydraulic cylinder, 16...Bed, 18, 18a, 24...
Limit switch, 21... Frame, 22...
Treadboard, 27...Dog.

Claims (1)

[Scope of utility model registration request] A safety step board device in which a step board is provided horizontally on the upper part of a bed between a fixed die plate and a movable die plate of an injection molding machine, and the step board is movable by a cylinder in synchronization with the mold opening/closing operation of the molding machine.