JPH0344500Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a device for replacing and removing molds that are detachably attached as split molds to a fixed platen and a movable platen in an injection molding machine. This invention relates to a mold changing device in a molding machine.

[Conventional technology]

Generally, in an injection molding machine, a fixed platen and a movable platen are provided facing each other, and a pair of male and female molds are detachably attached to both platens as split molds. The molds attached to both platens in this way are removed after being used for a certain period of time and replaced with another mold, but the conventional method for replacing and removing the same molds is to move the molds using a crane. In other words, as shown in FIG. 4, the mold W lifted by a crane K is carried in and out from above between the movable platen 7 and the fixed platen 8. A method of attaching and detaching with replacement was commonly used.

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned method of replacing and removing molds by lifting them with a crane,
Problems such as those listed below, namely, the replacement work is dangerous because the mold (heavy object) must be lifted to a high position.

Equipment such as a crane must be provided, which means that equipment costs are high.

A large building is required; that is, sufficient mold lifting space (mold height + crane lifting height) must be secured between the injection molding machine and the ceiling.

The problem is that it causes problems such as.

This invention is an attempt to improve the above-mentioned problems, and it is possible to improve the safety of the mounting and dismounting work when changing molds, and it can also be done with inexpensive equipment and a small work space. The problem to be solved lies in making it possible to replace and remove the mold. In other words, the molds of the present invention are carried in and out from the bottom between the fixed platen and the movable platen so that they can be replaced and removed. It is characterized by being equipped with a mold lifting mechanism and a conveying mechanism, and carrying the mold in and out between a fixed platen and a movable platen via the lifting mechanism and conveying mechanism. The means and effects are as follows.

[Means for solving problems]

A mold clamping mechanism and an injection mechanism are provided facing each other with a space between them, and a fixed platen is fixed to the injection mechanism side, while a movable platen is made to face the fixed platen and move back and forth freely on the mold clamping mechanism side. In the injection molding machine, an in/out conveyor is installed in the space in both width directions of the injection molding machine. The loading/unloading conveyor is formed by arranging a plurality of rollers extending in the front-rear direction and freely rotatably mounted on the shaft at regular intervals.

A loading/unloading elevator is installed in the space so as to be biased toward the fixed platen side. The loading/unloading elevator is provided with a fork that can be moved up and down, and formed so that the fork can enter between the fixed platen and the movable platen from below when ascending, and can cross the loading/unloading conveyor when descending. . That is, it is formed so that it can pass through the gap formed between each roller and descend to a position below the carry-in/out conveyor.

[Effect]

Mold installation work At the loading/unloading elevator, the fork is lowered to the lower position of the loading/unloading conveyor, and at the same time, at the loading/unloading conveyor, the mold is placed on one end of the conveyor, and the mold is moved to the center position of the injection molding machine. By raising the fork in the conveyed state, the effect of lifting the mold, that is, the effect of transporting the mold from below between the fixed platen and the movable platen can be obtained. Then, with the mold carried between the fixed platen and the movable platen, one of the split molds of the same mold is fixed to the fixed platen, and the other split mold is fixed to the movable platen, thereby attaching the mold. is obtained.

Mold removal work With the fork inserted between the fixed platen and the movable platen in the loading/unloading elevator, remove the split molds from the fixed platen and the movable platen, respectively, and place both split molds on the fork. By lowering the fork, the mold can be removed from between the fixed platen and the movable platen. Then, by lowering the fork to a position below the loading/unloading conveyor, a state is obtained in which the molds are placed on the loading/unloading conveyor, and in this way, the molds placed on the loading/unloading conveyor can be placed on the loading/unloading conveyor. The mold can be removed by transporting it toward one end of the loading/unloading conveyor of the injection molding machine.

〔Example〕

Hereinafter, specific embodiments of the present invention will be described with reference to the illustrative drawings.

In each drawing shown in Figures 1 to 3, 1
2 is an injection molding machine, and 2 is a machine base of the injection molding machine 1. On the machine base 2, a mold clamping mechanism 4 and an injection mechanism 5 are provided facing each other with a space 3 in between. A fixed platen 8 is provided upright on the side of the injection mechanism 5 facing the space 3, while a movable platen 7 is provided on the side of the mold clamping mechanism 4 so as to face the fixed platen 8 and move forward and backward. That is, a hydraulic cylinder (not shown) is installed horizontally on the side of the mold clamping mechanism 4, and a ram 6 is provided in the hydraulic cylinder so as to be movable forward and backward toward the injection mechanism 5. A movable platen 7 is fixed to the tip of the ram 6 by being loosely fitted to a tie bar 9 that extends horizontally in the space 3 so as to be movable forward and backward.
The injection mechanism 5 is connected to a heating cylinder 10, an injection plunger 11 that is fitted into the heating cylinder 10 so as to be able to move forward and backward, an injection nozzle 12 that is attached to the tip of the heating cylinder 10, and a rear end of the heating cylinder 10. Consists of hopper 13 etc.
It is provided so that it can be moved forward and backward in the direction of the fixed platen 8.

On the other hand, a conveyor 14 for loading and unloading the mold W is installed at the bottom of the space 3, that is, facing the top plate 2' of the machine base 2, and adjacent to the conveyor 14 on the side of the injection mechanism 5. Then, an elevator 15 for loading and unloading the same mold W is installed. Therefore, the carry-in/out conveyor 14 has a plurality of rollers extending in the front-rear direction (the forward/backward direction of the movable platen 7) and horizontally suspended so as to freely rotate in both width directions of the injection molding machine 1. They are formed by arranging them at regular intervals, and are provided so that the molds W can be conveyed in both width directions of the injection molding machine 1 by the conveyor 14 . In addition, in the loading/unloading elevator 15, 16 is a guide post erected on one side of the injection molding machine 1, and 17 is a pair of upper and lower bearings 18 on the other side of the injection molding machine 1 in parallel with the guide post 17. An elevating drive post installed horizontally rotatably via 18,
A ball screw 17a is formed on the outer peripheral surface of the drive post 17, and a large-diameter gear 19 is mounted on the lower end thereof. A small diameter gear 22 is provided on the large diameter gear 19 so as to be mounted on the drive shaft 21 of the motor 20 and meshed therewith. That is, both gears 2
It is provided so that the rotation of the motor 20 can be decelerated and transmitted to the drive post 17 through the meshing of the motors 2 and 19. Further, a fork 23 is attached to both the posts 16 and 17 so as to be able to move up and down. That is, the fork 23 is attached by loosely fitting one base part into the guide post 16 and screwing the other base part into a ball screw 17a cut into the drive post 17. It is installed so that it can be raised and lowered through movement. Furthermore, by forming the forks 23 in correspondence with the gaps formed between the respective rollers in the carry-in/out conveyor 14 described above, the fork 23 can be lowered to a position below the carry-in/out conveyor 14 by passing through the gaps. It is set up as follows. That is, the fork 23 can be raised and lowered by crossing the carry-in/out conveyor 14, and thereby the mold W placed on the carry-in/out conveyor 14 can be moved up and down by the fork 23.
It is provided so that it can be scooped up and raised by the carry-in/out conveyor 14, and the mold W lowered by the carry-in/out elevator 15 can be placed on the carry-in/out conveyor 14. The other 24 represents a safety hood.

Next, its effect will be explained.

By driving the motor 20 and transmitting the rotation of the motor 20 to the elevating drive post 17 via the drive shaft 21 and the meshing of the large diameter gear 19 and the small diameter gear 22, the drive post 17 is brought into a decelerated state. A state in which the fork 23 horizontally rotates is obtained, and a state in which the fork 23 moves up and down along the guide post 17 is obtained through the horizontal rotation of the drive post 17. Then, the movable platen 7 is moved backward toward the mold clamping mechanism 4 side, and the fork 23 is lowered to a position below the carry-in/out conveyor 14 through the horizontal rotation of the drive post 17. By placing the mold W on one end and pressing the mold W toward the other end of the carry-in/out conveyor 14, an effect of conveying the mold W toward the other end can be obtained. Then, with the mold W being transported to the center position of the space 3, the mold W is lifted by raising the fork 23 through the rotational drive of the motor 20 as described above. A state is obtained in which the platen is introduced from below between the fixed platen 8 and the movable platen 7, that is, the state shown by the solid line in FIG. 1 is obtained. Then, with the mold W carried between the fixed platen 8 and the movable platen 7 in this manner, one of the split molds of the same mold W is attached to the fixed platen 8, and the movable platen 7 is moved forward. By attaching the other split mold to the same movable platen 7, it is possible to obtain a state in which the mold W is attached to the fixed platen 8 and the movable platen 7.

On the other hand, with the mold W attached to the fixed platen 8 and the movable platen 7 in this way, the motor 20
After the fork 23 is raised through the rotational drive of and entered between the fixed platen 8 and the movable platen 7, the movable platen 7 is moved forward and the split molds are removed from the movable platen 7 and the fixed platen 8, respectively. A state is obtained in which the split mold is placed on the fork 23, that is, a state in which the mold W is placed on the fork 23 as shown by the solid line in FIG.
Then, by lowering the fork 23 with the mold W placed on the fork 23 in this manner, the mold W is moved between the fixed platen 8 and the movable platen 7.
At the same time, the fork 23 is moved to its lower end, that is, from the carry-in/out conveyor 14.
By lowering the mold W to a lower position, a state is obtained in which the mold W is placed on the carrying-in/out conveyor 14. And like this, the mold W is carried in and out on the conveyor 14.
The mold W can be removed from the injection molding machine 1 by transporting the mold W placed on top of the injection molding machine 1 toward one end of the carry-in/out conveyor 14.

In the above embodiment, the fork 23 is raised and lowered by a single lifting drive post 17 having a ball screw 17a carved thereon and a single guide post 16, but the lifting drive post 17 and The number of guide posts 16 is not limited to the above embodiment, and any number can be selected. Also, loading/unloading elevator 15
The means for raising and lowering the fork 23 is not limited to the raising and lowering drive post 17 having a ball screw 17a carved therein, but it is also possible to raise and lower it using other wires, chains, etc.

[Effect of idea]

The present invention is constructed as described above.
As mentioned above, a loading/unloading conveyor is installed extending in both left and right width directions in the space formed between the mold clamping mechanism and the injection mechanism, and a loading/unloading elevator is installed adjacent to the loading/unloading conveyor. It is provided so that its upper end can enter between the fixed platen and the movable platen, and its lower end can cross the loading/unloading conveyor and descend to a position below the loading/unloading conveyor. By making it possible to carry molds in and out between the fixed platen and the movable platen from below using the delivery conveyor and the carry-in/out elevator, molds can be transported between the fixed platen and the movable platen using conventional lifting equipment such as a crane. Compared to the method of loading and unloading from the top, it has become possible to replace and remove molds more safely.

Furthermore, with the above-mentioned configuration of the present invention, molds can be replaced and removed at low equipment costs and in a relatively small work space without requiring equipment such as a crane or a building with a high ceiling. I was able to do it.

[Brief explanation of the drawing]

Figure 1 shows a partially cutaway side view of an injection molding machine equipped with a mold changing device according to the present invention, and a second side view.
The figure is a plan view of the injection molding machine, and FIG. 3 is a partially cutaway plan view of the injection molding machine. FIG. 4 is a side view of an injection molding machine showing a conventional structure. 1... Injection molding machine, 2... Machine stand, 2'... Top plate, 3... Space, 4... Mold clamping mechanism,
5... Injection mechanism, 6... Ram, 7... Movable platen, 8... Fixed platen, 9... Tie bar, 10
... Heating cylinder, 11 ... Injection plunger, 12 ... Injection nozzle, 13 ... Hopper, 1
4... Loading/unloading conveyor, 15... Loading/unloading elevator, 16... Guide post, 17... Lifting drive shaft, 17a... Ball screw, 18... Bearing, 19... Large diameter gear, 20... Motor,
21... Drive shaft, 22... Small diameter gear, 23... Fork, W... Mold.

Claims (1)

[Scope of utility model registration request] A mold clamping mechanism and an injection mechanism are provided facing each other with a space between them, and a fixed platen is fixed to the injection mechanism side, while a movable platen is made to face the fixed platen and move back and forth freely on the mold clamping mechanism side. In the injection molding machine, a plurality of rollers extending parallel to the injection direction and freely rotatably mounted in the space are arranged at regular intervals across both width directions of the injection molding machine, and A mold changing device for an injection molding machine, comprising a fork that is movable up and down so that it can enter between a fixed platen and a movable platen from below when rising, and can cross the roller when falling.