JPS625814A - Resin pelletizing device - Google Patents

Abstract

PURPOSE:To improve the durability of a bearing member by a method wherein a cutter holder is coupled directly to the rotor of a hydraulic motor, an oil path is formed in a fixing shaft and lubricating oil is contained in fluid for the hydraulic motor while a circuit for supplying the fluid in the secondary side of the hydraulic motor into the oil path is formed. CONSTITUTION:A branch line 29 is connected to the return line 28 of the hydraulic motor 10 as the supplying circuit and the branch line 29 is connected to the oil path 30 in the fixing shaft 7. The oil path 30 is for supplying lubricating oil to a metal 9. Lubricating oil is contained in the fluid supplied from the hydraulic pump 27 to the hydraulic motor 10 and the fluid in the secondary side of the hydraulic motor 10 or excessive oil of the hydraulic motor 10 is distributed from the return line 28 into the branch line 29, thereafter, is supplied to the metal 9 of the bearing member through the oil path 30 in the fixing shaft 7 to cool and lubricate the metal 9, therefore, overheat of the metal 9 may be prevented and the durability thereof may be improved.

Description

Detailed Description of the Invention (a) Field of the Invention The present invention relates to a resin pellet manufacturing apparatus for manufacturing resin pellets by cutting linearly molded and extruded resin from a die attached to an extrusion head. .

(B) Background of the Invention Conventionally, as a resin pellet manufacturing apparatus of the above-mentioned example, there is, for example, an apparatus described in Japanese Patent Application No. 57-202400.

That is, this resin pellet 1~manufacturing apparatus includes a cylinder,
A die is attached to the front of the extrusion-like tip head equipped with a screw, etc., a cutter holder equipped with a cutter is installed opposite to the front of this die, and this cutter holder is supported by a fixed shaft via a ball bearing. The resin extruded from the above-mentioned die is cut by a cutter to produce resin pellets.

However, this conventional device has the following problems.

The heat of the molten synthetic resin raw material is transmitted to the cutter boulder and the fixed shaft, and the above-mentioned pole bearing is relatively sensitive to heat, so there is a problem that the ball bearing between the fixed shaft and the cutter holder may be damaged. was.

(c) Purpose of the Invention This invention drives the cutter holder with a fluid motor, and uses the excess flow of this fluid to cool and lubricate the bearing members, thereby improving the durability of the bearing members. The purpose is to provide resin pellet manufacturing equipment.

(D) Summary of the Invention This invention provides a fluid motor that is disposed on a fixed shaft through a bearing member, the cutter holder is directly connected to the rotor of the fluid motor, and lubricating oil is applied to the inside of the fixed shaft. This is a resin pellet manufacturing device in which an oil passage is formed to supply a member, lubricating oil is contained in the fluid supplied by a fluid motor, and a supply circuit is formed to supply fluid on the secondary side of the fluid motor to the oil passage. It is characterized by

(E) Effects of the Invention According to this invention, the bearing supplies the above-mentioned surplus flow on the secondary side of the fluid motor to the member via the supply circuit and the oil passage in the fixed shaft, and the bearing supplies the member with this surplus fluid. Along with cooling the
Since the bearing can lubricate the member with the lubricating oil contained in the fluid, the bearing has the effect of preventing the member from overheating and improving its durability.

In addition, since the cutter holder described above is driven by a fluid motor, compared to the 88, which has a conventional power transmission structure using a chain and sprocket, it has the effect of improving maintainability such as replacing the cutter blade and cleaning the head. .

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows a resin pellet manufacturing apparatus, and in FIG. 1,
A head 2 is disposed at the tip of an extruder 1, which is equipped with a cylinder, screw, etc. (not shown) inside, and a die 3 is mounted movably on the front surface of the head 2.

A large number of mold holes 5 (for convenience of illustration, only four are shown in FIG. 1) are bored in the front end of the die 3, and the mold holes 5 communicate with the molten synthetic resin flow path 4, and the resin is molded into a linear shape. It is structured as possible.

Furthermore, a casing 6 with open upper and lower ends is removably attached to the front surface of the die 3 described above.

A fixed shaft 7 screwed into the center of the front end of the die 3 passes through the casing 6 and projects further forward, and a block 8 is removably disposed at the front end of the fixed shaft 7. .

A fluid motor 10 is disposed on this fixed shaft 7 via a metal 9.9 as a bearing member.

The fluid motor 10 described above has a rotor 11 disposed on a metal 9, a plurality of vanes 12 disposed in a plurality of vane grooves of the rotor 11, and a fluid inlet 13 and an outlet 14. It is equipped with a cylinder 15 and side covers 16 and 17, and is surrounded by a single housing 18, and the above-mentioned casing 6 is
It is removably attached to the 0a side of the

Rotor 11 in fluid motor 10 configured in this way
The rotary cutting device 20 is installed.

This rotary cutting device 20 has the mold hole 5 of the die 3 described above.
・This device 20 includes a cutter holder 21 that is screwed onto the rotor 11 described above and is placed in the casing 6, and a cutter holder 21 that is screwed into the rotor 11 and placed in the casing 6, and as shown in FIG. A cutter blade 24 is attached using screws 23 within a groove 22 formed on the surface of the cutter holder 21 facing the die 3.

In this embodiment, a total of four cutter blades 24 are screwed to the cutter holder 21, and two cutter blades 24 facing each other are fixed to the cutter holder 21 with screws.
．． 24 and the mounting positions of the other two cutter blades 24.24, one set of cutter blades 24.24 in the vertical direction in FIG. By changing the installation position of the pair of cutter blades 24° 24 in the vertical direction in the figure, the location where each cutter blade 24 cuts the linear resin A can be changed, and the position of each cutter blade 24 can be changed.
4. It is configured to improve the durability of...

Then, the rotary cutting device 20 in the casing 6 described above
The front part of the installation part, that is, the lower casing 3 in Fig. 1
The venturi portion 37 of No. 6 is provided with a nozzle 25 that spouts hot water at a predetermined temperature in an atomized form.

By the way, the inlet 13 in the fluid motor 10 shown in
A fluid pump 2 is connected to the fluid pump 2 via a main flow line 26 for fluid supply.
7 is connected, and a return line 28 is connected to the outlet 14.

Furthermore, the above-mentioned return line 28 on the secondary side of the fluid motor 10
Two branch lines serving as supply circuits are connected to , and this branch line 29 is connected to the oil passage 30 inside the fixed shaft 7 described above.

This oil passage 30 is an oil passage for supplying lubricating oil to the aforementioned metal 9, and is used for the aforementioned fluid pump 27 and fluid motor 10.
An air motor, a water pressure pump, and a water pressure motor are used as the fluid, and an appropriate amount of lubricating oil is contained in the gradient air or water as the working fluid, and this lubricating oil is transferred to the metal via the return line 28, branch line 29, and oil path 30. Supply to 9.

Further, the lubricating oil after lubricating the metal 9 is collected into a tank 32 via a drain 31.

Note that a spring 34 for biasing the rotary cutting device 20 toward the die 3 is interposed between the bearing 33 disposed at the protruding end of one of the side lids 16 and the aforementioned 71-knot 8. ing.

The illustrated embodiment is constructed as described above, and its operation will be explained below.

A blower (not shown) for discharging forced cooling air is connected to the lower casing 36, and a cyclone (not shown) is connected to the upper opening of the casing 6 via a duct etc. for use. .

Now, the molten synthetic resin that has reached the molten synthetic resin flow path 4 via the head 2 due to the action of the extruder 1 reaches the die hole 5 in the die 3 due to the further extrusion action of the extruder 1 described above, where it forms a line. After being molded into a shape, it is extruded into a casing 6 through the opening at the front end of the mold cavity 5.

The extruded linear resin is cooled by forced cooling air and sequentially cut by the cutter blade 24 driven by the fluid motor 10, so that the linear resin becomes resin pellets of a predetermined size. After being conveyed to the cyclone via the duct by the compressed air from the aforementioned blower, it is dehydrated.

In addition, when atomized hot water at a predetermined temperature is sprayed from the front single nozzle 25 onto the cut area by the cutter blade 24, the hot water becomes atomized and cools the resin pellets while keeping them at a predetermined low temperature. Since the pellets after cutting can be cooled without appropriately cooling the die 3, the cooling effect can be improved.

Moreover, the fluid (in air or water) supplied from the fluid pump 27 to the fluid motor 10 contains lubricating oil, and the fluid on the secondary side of the fluid motor 10 or surplus fluid is transferred from the return line 28 to the branch line 2. After the branch line 29 flows through the oil passage 30 in the fixed shaft 7, the bearing supplies the metal 9 as a member to cool and lubricate the metal 9, thereby preventing overheating of the metal 9. This has the effect of preventing this and improving its durability.

In addition, since the cutter holder 21 described above is directly connected to and driven by the rotor 11 of the fluid motor 10, the conventional sprocket,
Unlike mechanical power transmission means using chains, during maintenance, the cutter blade 24 can be replaced and the head 2 cleaned by removing the above-mentioned lines 26 and 28 and the minimum necessary parts. Since this method does not require the troublesome work of removing the chain and sprocket, maintenance efficiency can be improved.

Regarding the correspondence between the structure of the present invention and the above-described embodiments, the bearing member of the present invention corresponds to the metal 9 of the embodiment, and the supply circuit corresponds to the branch line 29 in the same manner. ,
The present invention is not limited to the configuration of the embodiment described above.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a cross-sectional view of a resin pellet manufacturing apparatus, and FIG.
It is a sectional view taken along the line ■-■ in the figure. 3...Dice 5...Mold Hole 7...Fixed shaft 9...Metal 10...Fluid motor 11...Rotor 21...Cutter holder 2
9... Branch line 30... Oil path 7... Fixed shaft 21... Force, 9 Main 1 C9. Fig. 2

Claims (1)

[Scope of Claims] 1. A resin pellet manufacturing apparatus in which a cutter blade for cutting linear resin extruded from a mold hole of a die is attached to a cutter holder, and a fluid motor is arranged on a fixed shaft via a bearing member. the cutter holder is directly connected to the rotor of the fluid motor, an oil passage is formed inside the fixed shaft for supplying lubricating oil to the bearing member, and the lubricating oil is contained in the fluid supplied by the fluid motor. , A resin pellet manufacturing apparatus having a supply circuit for supplying fluid on the secondary side of the fluid motor to the oil passage.