JPH02194864A - Plastic material grinder - Google Patents

Abstract

PURPOSE:To crush materials to be regenerated and unused materials into particles of specified size or smaller and mix them at the same time by providing a throw-in port for materials to be regenerated and a feed port for unused granular materials on the upper part of a crusher and making it possible to control feed quantities of said unused materials fed by means of a feed device. CONSTITUTION:A throw-in port 2a for materials to be regenerated such as runner and poor molded articles just after the molding by means of a molding machine and a feed port 3a of a feed device 3 for unused materials are provided on a crusher 5, whereby both materials are crushed at the same time into particles of specified size or smaller, while both materials are mixed with each other and also feed quantities of said unused materials fed by means of the device 3 are controlled so that feed quantities required for a molding machine can be provided. As a result, other mixing device is not needed and work for measuring the ratio between both the materials to keep said ratio at a certain ratio is not required. Further, if this crusher and a molding machine are interconnected by means of an automatic material transportation means, drying period and power for a dryer can be saved since material to be regenerated is not humidified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] This invention is mainly used in material supply systems of plastic molding factories, in which recycled materials and granular unused materials (hereinafter simply referred to as unused materials) are reduced to a predetermined size or less. The present invention relates to a plastic material crusher that mixes recycled materials and unused materials while crushing them.

[Prior Art] Conventionally, the material supply system in a plastic molding factory uses a commonly used crusher to crush recycled materials such as runners and defective molded products to a size smaller than a predetermined size, and then converts this recycled material into recycled materials. The recycled material and the unused material were once stored, and as needed, the recycled material and the unused material were mixed in a fixed ratio and fed to a molding machine.

[Problem to be solved by the invention] However, in the conventional material supply system mentioned above,
Since the purpose of the general-purpose crusher was simply to make recycled material, it goes without saying that a separate mixing device must be installed, and it takes a lot of effort to measure recycled material and unused material into a fixed ratio. However, the labor involved in loading and unloading the materials into the mixer was extremely laborious. A quantitative mixing device has been developed to automatically perform the above operations, but the device is expensive and requires a relatively large space.
Due to management issues and unsuitability for small loft production, it has not become widespread.

In addition, although damaged materials such as runners and defective molded products do not absorb moisture immediately after molding, they absorb moisture while the recycled materials are stored, so they must be dried before use. This wastes time, power, etc.

In addition, it is difficult to match the dimensions and shapes of recycled materials and unused materials, and no matter how well they are mixed in the mixing device, they will separate during the feeding and transportation process to the molding machine, making it difficult to maintain stability in the molding machine. This was a factor that inhibited plasticization, that is, stable molding.

The present invention was made to solve such problems, and its purpose is to provide a plastic material crusher that mixes recycled materials and unused materials while simultaneously crushing the recycled materials and unused materials to a predetermined size or less. It is about providing.

Means for Solving the Problems] In order to solve the above problems, the plastic material crusher according to the present invention is as follows. That is, the plastic material crusher according to the present invention focuses on the fact that a part of the rotary cutter of the crusher also has a mixing function, and it is possible to remove recycled materials such as runners and defective molded products immediately after being molded by a molding machine. The input port and the supply port for the unused material supply device are provided at the top, and while the recycled material and unused material are simultaneously crushed to a predetermined size or less, the recycled material and unused crushed material are mixed and molded. The amount of unused material supplied by the supply device can be controlled to meet the required amount of supply to the machine.

[Function] The plastic material crusher according to the present invention has the following functions. First, the runners and defective molded products immediately after being molded by the molding machine are placed in the upper part of the crusher using a take-out robot attached to the molding machine or a conveyor guided from the product drop opening of the molding machine. The recycled material is put into the input port of the recycled material, and is crushed by a part of the cutter of the crusher to a size smaller than a predetermined size to become recycled material. Here, the production amount of recycled material per hour is approximately constant unless the molding cycle of the molding machine changes.

On the other hand, the unused materials that have been opened are stored in the hopper of the supply device, and are supplied through the supply port provided at the top of the crusher, and are crushed to a size smaller than a predetermined size by a part of the cutter of the crusher, leaving the unused materials unused. It becomes pulverized material. Here, the supply amount from the supply device is controlled to such an amount that the sum of the production 1 of the recycled material and the unused crushed material satisfies the required amount of the molding machine. General-purpose molding machines have a signal that they send out when they run out of material, so you can use this.

In addition, since the recycled material and unused material are simultaneously crushed by a part of the cutter of the crusher, it goes without saying that they are properly mixed, and the sizes and shapes of the recycled and unused crushed materials are the same. Easy to do.

The materials that have been crushed and mixed in the amount required by the molding machine as described above are transported and supplied to the molding machine through the discharge port provided at the bottom of the crusher.

[Example] Next, the present invention will be explained in detail. FIG. 1 is a partially sectional front view of a preferred embodiment of the crusher 1 of the present invention. The embodiment shown in the figure will be described below. At the top thereof, there is a charging chute 2 with an input port 2a for recycled materials, and a supply device 3 with a supply port 3a for unused materials below it, and at the bottom thereof a discharge chute 4 and a discharge port 4a. A crusher body 5 having a crusher body 5 is provided on a pedestal 6, and a crushing mechanism (not shown) comprising a rotary cutter and the like is disposed within the body 5.

Although not shown, the material discharge port 4a and the hopper of the molding machine are connected by an automatic material transport means. In the lower space inside the hopper 3b of the feeding device 3, there is a threaded hole on the outer diameter.
A book screw shaft 7 is rotatably contained therein, one end 7a of the screw shaft 7 protrudes to the supply port 3a, and the other end 7b is connected to a variable speed motor 8 provided on the outer surface of the hopper 3b. The output shaft 8a and the output shaft 8a are connected to each other by penetrating into the hopper 3b. Furthermore, the variable speed motor 8 can be started and stopped, and its rotational speed can be freely controlled by commands from a control box 9 which also serves as a base for the supply device 3. The crusher 1 shown in FIG. 1 has the above configuration. Next, its effect will be explained. First, the runners and defective molded products molded by the molding machine are charged into a chute 2 for charging recycled materials provided at the top of the crusher 1.
A part of the rotary cutter of the crusher main body 5 crushes the material to a size smaller than a predetermined size, and becomes recycled material. On the other hand, the unsealed unused material is stored in the hopper 3b of the supply device 3 and surrounds the screw shaft 7 located below.

When a signal requesting material is received from the molding machine, the control box 9 issues a command to the variable speed motor 8 to rotate at a predetermined speed. The output shaft 8a started rotating in response to this.
At the same time, the screw shaft 7 rotates at a predetermined speed. When the screw shaft 7 rotates, it generates an axial thrust, so the unused material is pushed out through the supply port 3a and supplied to a part of the rotary cutter of the crusher main body 5, where it is crushed to a size smaller than a predetermined size and becomes unused. It becomes pulverized material. However, the above predetermined dimension and the dimension of the unused material are premised on the following relationship: (predetermined dimension) <(dimension of the unused material). If the rotation speed of the screw shaft 7 is appropriately controlled, the recycled material and the unused material are simultaneously crushed by a part of the rotary cutter of the crusher main body 5, and are mixed appropriately, while being transported to the lower part of the main body 5. It is supplied to the molding machine through the provided outlet 4a.

Although there are times when a large amount of material is required, such as when the molding machine starts operating, the discharge chute 4 of the above embodiment is regarded as a pulverized material tank, and a certain amount of pulverized material is stored therein. This can be dealt with by detecting the amount and sending a signal to the control box 9.

[Effects of the Invention] As explained above, in the crusher of the present invention, the input port for recycled materials such as runners and defective molded products immediately after molding in the molding machine, and the supply device for unused materials are connected. A supply port is provided at the upper part of the machine, and the recycled material and the unused material are mixed while being crushed to a size smaller than a predetermined size, and the amount of unused material supplied by the above-mentioned unused material feeding device is adjusted according to the required amount of supply to the molding machine. Since it is controllable, the following effects are achieved.

(1) Since the crusher according to the present invention simultaneously crushes recycled materials and unused materials, it has an appropriate mixing function, and it goes without saying that a separate mixing device is not required. There is no need for the labor of measuring ingredients to a certain ratio and the labor of loading and unloading materials into the mixer.

(2) If the crusher and molding machine according to the present invention are connected by an automatic material transport means, there is no time for the recycled material to absorb moisture, so drying time and power for the dryer can be significantly saved.

(3) Since the recycled material and the unused material are crushed at the same time in the cutter section of the crusher, the sizes and shapes of the recycled material and the unused crushed material are likely to match, and they are separated during the feeding and transportation process to the molding machine. This greatly contributes to stable plasticization in the molding machine, that is, stable molding.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the crusher of the present invention. 2a...Input port 3a...Supply port 5...Crusher body 7...Screw shaft 8...Variable speed motor

Claims (1)

[Claims] An input port for recycled materials such as runners and defective molded products, and a supply port for a granular unused material supply device are provided at the top, and the amount of granular unused material supplied by the supply device can be controlled. Features: Plastic material crusher.