JP2002127212A - Injection molding machine and method for injection molding as well as shaft of rotary brush for cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable molding of a long-sized shaft of a rotary brush by a synthetic resin without bringing about a shrinkage or the like. SOLUTION: The synthetic resin is filled from a resin filling port 13 of an injection molding machine body 11 in a core 14a of a mold 14. Spiral grooves for the shaft are previously formed on the core 14a of the mold 14. A method for injection molding comprises the steps of moving a fourth member 14 by a moving mechanism after the filling of the synthetic resin in the core 14a of the mold 14 is completed, and bringing the axial direction of the shaft in the core 14a of the mold 14 and the axial direction of a protrusion 20 into coincidence with those of cooling cylinders 12a to 12c for constituting a cooling mechanism 12. The method further comprises the step of thereafter depressing the protrusion 20 by a hydraulic cylinder 21. The method also comprises the steps of depressing the shaft down while rotating the protrusion 20 by a key when the protrusion 20 is depressed. Thus, the shaft is pressed out from the core 14a while rotating along the spiral groove of the core 14a. Since the shaft is molded in this manner, the long-sized shaft (about 150 mm) can be molded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection molding apparatus for obtaining a rotary brush shaft to be incorporated in a suction nozzle portion of a household vacuum cleaner by injection molding, a rotary brush shaft of a vacuum cleaner, and an injection molding method. is there.

[0002]

2. Description of the Related Art As is well known, a rotary brush which exerts power in removing dust and the like is incorporated in a suction nozzle portion of a household vacuum cleaner. The rotating brush includes a shaft having a spiral groove, and a blade mounted on the spiral groove of the shaft.

[0003]

The shaft is made of synthetic resin or aluminum. The former synthetic resin shaft is molded by an injection molding device and then uses a means of protruding from the molding device with a round cross-section and fixed type protruding rod, so only the shaft length of about 50 mm to 60 mm is manufactured Can not. For this reason, in order to use the shaft as a rotary brush shaft, a means of using a shaft of about 50 mm to 60 mm with a length of about 150 mm by connecting about three metal pins or the like is employed. Without adopting such means, suddenly, for example, if a long shaft with a length of 150 mm or more is manufactured with a protruding rod, in the case of a shaft with poor shrinkage or release, it may not be possible to protrude. There was a tendency to be extremely large.

Therefore, the latter aluminum shaft has come to be used. This aluminum shaft is twisted after extruding aluminum, but it is expensive and twisted.
There is a problem that manufacturing processing is difficult, for example, quality uniformity cannot be obtained.

The present invention has been made in view of the above circumstances, and is an injection molding apparatus and a vacuum cleaner capable of molding a long shaft for a rotary brush of a household vacuum cleaner by using a synthetic resin without causing shrinkage or the like. It is an object of the present invention to provide a rotary brush shaft and an injection molding method.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is to provide a core having a spiral groove and formed in a mold for a rotary brush shaft of a vacuum cleaner. A mold having a mold is provided on the movable side, and the resin is injected into the core from the fixed side, and then the mold is moved to a certain position. After being moved to a position, the pressing body is pressed downward by a pressing machine, and a linear body is converted into a rotary movement to extrude while rotating the resin of the core. A cooling mechanism that is arranged so as to be on a straight line and that cools the resin extruded by the protruding body by pushing it in.

A second invention is characterized in that the projecting body has a spiral groove, and the linear movement is converted into a rotational movement by a guide key provided in the main body of the injection molding apparatus in the groove. It is assumed that.

The third invention is characterized in that the cooling mechanism comprises a cooling cylinder cooled by cooling water.

A fourth invention is characterized in that the resin extruded from the core of the mold is cooled by a cooling mechanism and formed on a rotary brush shaft of a vacuum cleaner.

In a fifth aspect of the present invention, a resin is formed by using a main body of an injection molding apparatus provided with a protruding body which is pressed down by a pressing machine at an upper part and a cooling mechanism provided coaxially with the protruding body at a lower part. In the method of performing injection molding, after filling a resin into a mold core provided on the movable side of the injection molding device body, the mold core is moved by moving the injection molding device body so that the core is coaxial. When the position of the arranged protruding body and the cooling mechanism is reached, the protruding body is pressed to convert the linear motion of the protruding body into a rotary motion, and the core resin is extruded and pushed into the cooling mechanism for cooling. It is characterized by the following.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIGS. 1 (a) to 1 (c) show a sectional view of a part of an injection molding apparatus main body 11 according to Embodiment 1 of the present invention with a cooling mechanism 12 added thereto. FIG. 1A is a cross-sectional view illustrating a configuration when a synthetic resin is injected into a main body 11 of the injection molding apparatus from a synthetic resin injection machine (not shown). In FIG. 1A, the injection machine inserts a synthetic resin into a mold 14 through a resin injection port 13 of an injection molding apparatus main body 11.
Is filled in the core 14a. A mold for a rotary brush shaft of a household vacuum cleaner is formed in the core 14a of the mold 14, and a spiral groove is formed in the mold in advance.

Reference numerals 15 and 16 denote first and second members on the fixed side. The first and second members are fixed to a device (not shown). Reference numerals 17 and 18 denote third movable sides which will be described in detail later.
The fourth and fourth members 17, 18 are formed so as to be moved by a moving mechanism (not shown) provided on the right side in the figure.

The mold 14 includes a fourth member 18 and a screw 19.
After the filling of the core 14a of the mold 14 with the synthetic resin is completed, the fourth member 1 is moved by the moving mechanism.
4 is moved. With the movement of the fourth member 14, the mold 14 moves rightward in the figure.

Then, as a result of the movement, the core 14 of the mold 14 is formed.
As shown in FIG. 1B, the axial direction of the shaft in a.
Projection body 20 provided on the upper part of injection molding apparatus main body 11
Of the cooling cylinders 12a to 12 constituting the cooling mechanism 12
The axial directions of c are matched (disposed on a straight line).

Thereafter, the projecting body 20 having the spiral groove is
It is pushed down in the figure by a pressing machine including a hydraulic cylinder 21 and the like. When this is pushed down, the core 14a of the mold 14 is
Since a spiral groove is formed inside, the shaft inside the core 14a cannot be pushed out from the core 14a even if it is simply pushed down linearly.

For this reason, when the protruding body 20 is pressed down, the linear motion is converted into a rotary motion by a guide key (described later), and the protruding body 20 is rotated. By this action,
The shaft is also pushed out of the core 14a while rotating along the spiral groove of the core 14a. In this way, because the shaft was molded, a long shaft (having a length of about 150 mm) could be molded, and the molded long shaft was cooled by the cooling mechanism. Warpage does not occur even with a long shaft.

As described above, the bearing 22 is provided on the head of the protruding body 20 so as to rotate the protruding body 20 so that the protruding body 20 can be smoothly rotated. . Reference numeral 23 denotes an extruded body that linearly pushes down the protruding body 20 with the hydraulic cylinder 21 downward.

FIG. 1 (c) shows the mold 1
Of the cooling cylinder 12 by pushing out the shaft in the
It is sectional drawing at the time of pushing into a. Cooling cylinder 12a
~ 12c is set to be approximately the same length as one shaft,
In this embodiment, the first molded shaft is cooled about three times with the cooling water in the cooling cylinders 12a to 12c, and then the first molded shaft is obtained at the fourth time. By adopting, the shaft does not warp or the like.

FIGS. 2 (a), 2 (b) and 2 (d) show details of the above-mentioned projecting body 20.
Is configured such that the pin 24 is detachable so that the other spiral groove can be easily replaced with a different projecting body. FIG. 2C shows the bearing 22, and FIG.
(E) shows the mounting member 26 of the key 25 provided on the third member 17 of the injection molding device main body 11, respectively.

Next, the forcible locking mechanism will be described with reference to FIGS. 3 and 4. The same parts as those in FIG. 1 are denoted by the same reference numerals, and FIG. 3 is a cross-sectional view taken along the line A--A in FIG. FIG. 4 is a perspective view of the forced lock mechanism. The forced lock mechanism is disposed on both sides of the injection molding device main body 11, and as shown in FIG.
A fixed body 31 formed in a desk shape having substantially low legs, and a plate-shaped moving body 3 that is slidably moved between the legs of the fixed body 31.
2 and a lock bar 33 whose leading end is in contact with the moving body 32 and both ends of which are locked to the lower legs 31a and 31b of the fixed body 31 in the figure. In addition, fixed body 3
1 is fixed to the second member 16 shown in FIG. 3 using a fixing screw 35 and a fixing pin 36, and the moving body 32 is
Is fixed using a fixing screw 37 and a fixing pin 38.

The lock bar 33 is embedded in the third member 17 via a spring 34, as shown in FIG. 3A, and usually, as shown in FIG.
Are fixed to the legs 31 a and 31 b of the fixed body 31 and pressed against the back surface of the moving body 32 by the spring 34. For this reason, the third member 17 is in a state of being forcibly pressed (locked) by the second member 16.

FIG. 3 (a) is an explanatory view when the resin is filled in the core 14a of the mold 14, that is, in the state of FIG. 1 (a). After the filling is completed, the movable side of the injection molding apparatus main body 11 is moved in the direction of the arrow shown in FIG. Then, when the fourth member 18 moves as shown in FIG. 3B, the space between the fourth member 18 and the third member 17 is opened. With this,
The moving body 32 fixed to the fourth member 18 is also the third member 1
Slide the side of 7 to move. Therefore, the lock bar 3 is attached to the tapered surface 32a formed on the back surface of the moving body 32.
The third taper surface 33a abuts.

Then, the lock bar 33 is gradually pushed into the third member 17 while being pressed by the tapered surface on the back surface of the moving body 32. When the moving body 32 further moves, the lock bar 33 releases the locking of the fixed body 31 (FIG. 3).
(C)). When the lock bar 33 and the fixed body 31 are unlocked, the opening of the third member 17 and the fourth member 18 is stopped by the stopper bolt 39. When this state is reached at the position shown in FIG. 1C, the projecting body 20 is pressed by the hydraulic cylinder 21 and the shaft in the core 14 a is inserted into the cooling cylinder 12. Thereafter, the above steps are automatically performed to take out the shaft from the lower part of the cooling cylinder 12. The movement and stoppage of the third and fourth members 17 and 18 by the moving mechanism are detected by limit switches (not shown) to control the drive unit.

(Embodiment 2) FIG. 5 is a flowchart showing an injection molding method according to Embodiment 2 of the present invention. In FIG. 5, in step S1, a synthetic resin injection machine (not shown) is first mounted on a core of a mold. Fill synthetic resin from. In addition, the mold of the rotary brush shaft of the household vacuum cleaner is formed in the core, and a spiral groove is formed in the mold in advance. As described above, when the core is filled with the synthetic resin, the core of the mold is moved to a position where the protruding body is present (step S2). When the core reaches the position of the protruding body, the movement of the injection molding apparatus main body is stopped (step S3).

Thereafter, the hydraulic cylinder is operated to press the protruding body so as to push out the shaft in the core (step S4). The protrusion is guided by a key provided in the injection molding apparatus in advance, and is pushed into the cooling cylinder while rotating the shaft (steps S5 and S6). When the shaft is completely pushed into the cooling cylinder, the molding device returns to the initial state, and the synthetic resin is again injected into the core (step S7). In this way, when the synthetic resin shaft in the core is protruded by the protruding body, the protruding body is rotated to protrude from the core, so that the protruding shaft can be lengthened and relatively easily protruded. . Moreover, the protruded shaft is pushed out while being cooled by the cooling cylinder, so that the shaft does not warp or the like.

FIG. 6 shows a rotary brush shaft 41 of a vacuum cleaner formed by using the first and second embodiments.
In the figure, reference numeral 42 denotes a spiral groove formed in the shaft 41.
Is inserted.

[0028]

As described above, according to the present invention,
A long shaft can be molded using a synthetic resin, and there is an advantage that it has a spiral groove so that it can be used as a rotating brush for a vacuum cleaner without causing a problem such as warping, and can be manufactured at low cost. And so on. Also,
ADVANTAGE OF THE INVENTION According to this invention, since a molding can be automated, a long shaft can be manufactured in large quantities at low cost.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, in which (a)
Is a side sectional view when the resin is injected into the mold, (b) is a side sectional view when the mold is moved and the shaft is extruded,
(C) is a sectional side view when the entire movable side of the injection molding apparatus main body is further moved.

2A is an explanatory view showing a relationship between a protrusion and a guide key, FIG. 2B is a bottom view of the protrusion, FIG. 2C is a configuration diagram of a bearing, FIG. 2D is a detailed view of the protrusion, and FIG. () Is an explanatory diagram of a guide key.

3A is a cross-sectional view taken along line AA of FIG. 1, FIG.
(C) is an explanatory view of the operation of the forced lock mechanism.

FIG. 4 is a perspective view showing details of a forced lock mechanism.

FIG. 5 is a flowchart showing a second embodiment of the present invention.

FIG. 6 is a perspective view of a rotary brush shaft of a vacuum cleaner obtained by using the first and second embodiments of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Injection molding apparatus main body 12 ... Cooling mechanism 12a-12c ... Cooling cylinder 13 ... Resin inlet 14 ... Die 14a ... Core 15 ... 1st member 16 ... 2nd member 17 ... 3rd member 18 ... 4th member 20 ... Projecting body 21 ... Hydraulic cylinder 22 ... Bearing 25 ... Guide key 31 ... Fixed body 32 ... Moving body 33 ... Lock bar 41 ... Shaft

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) B29L 31:42 B29L 31:42 F term (Reference) 3B061 AD11 4F202 AG14 AH04 AH72 AK02 AM34 CA11 CB01 CK67 CK73 CK81 CM03 CN05 CN13 CN22 4F206 AG14 AH04 AH72 AK02 AM34 JA07 JL02 JM13 JN14 JN25 JN43 JQ81

Claims (5)

[Claims] 1. A mold having a spiral groove and a core formed in a mold of a rotary brush shaft of a vacuum cleaner is provided on a movable side, and a resin is injected into the core from a fixed side. An injection molding device main body for moving the mold to a certain position, disposed on the upper movable side of the main body, moving the mold to a certain position, and then pressed downward by a pressing machine;
A protruding body that converts linear motion into rotational motion and extrudes the resin of the core while rotating the same; and An injection molding device, comprising: a cooling mechanism that pushes and cools a resin. 2. The protruding body has a spiral groove, and a linear key is converted into a rotary motion by a guide key provided in the main body of the injection molding apparatus in the groove. Item 1. An injection molding apparatus according to Item 1. 3. The injection molding apparatus according to claim 1, wherein said cooling mechanism comprises a cooling cylinder cooled by cooling water. 4. A rotary brush shaft for a vacuum cleaner, wherein a resin extruded from a core of a mold is cooled by a cooling mechanism to form a shaft. 5. Injection molding of a resin is performed by using an injection molding apparatus main body having an upper part provided with a protruding body depressed by a pressing machine and a lower part provided with a cooling mechanism disposed coaxially with the axial direction of the protruding body. In the method performed, after filling the resin into the mold core provided on the movable side of the injection molding device body, the mold core was moved by moving the injection molding device body, and the mold core was arranged coaxially. When the position of the protruding body and the cooling mechanism is reached, the protruding body is pressed to convert the linear motion of the protruding body into rotary motion while extruding the resin of the core and pushing it into the cooling mechanism for cooling. Injection molding method.