JP2014144601A - Injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection molding machine where an injection unit cover covering an injection mechanism part composed in an injection unit can perform supporting in such a manner that it is not easily deformed by dead weight or the like even if being a simple constitution.SOLUTION: Provided is an injection molding machine comprising an injection unit cover 15 covering an injection mechanism part 12 operated with the injection of a molten resin as purpose not so as to be exposed to the outside in the cavity of a mold. The injection unit cover 15 includes: a U-shaped cover 16; and right and left side face covers 17 covering both the side faces relatively confronted in the U-shaped cover 16. The side face covers 17 include a plurality of division structures in the front side face cover 17a and the rear side face cover 17b, and the adjoining parts thereof are coupled so as to be piled doubly in the longitudinal direction, thus the double coupling in the longitudinal direction is made into a supporting structure of suppressing the deflection of the U-shaped cover 16.

Description

  The present invention relates to an injection molding machine including an injection unit that injects a resin melted by a heating cylinder into a mold cavity, and more particularly to an injection molding machine including a cover outside the injection unit.

  In a conventional injection molding machine that has been used in the past, a granular thermoplastic resin (pellet) as a raw material is fed into a heating cylinder, and the resin is melted by a reciprocating screw provided in the heating cylinder. Sending out to the nozzle side of the screw tip, injecting molten resin from the injection nozzle provided on the screw tip side into the cavity of the mold apparatus, cooling the molten resin in the cavity and solidifying, then opening the mold apparatus, A molded product is molded by removing a molded product attached to the mold with a protruding pin or the like from the mold.

  Such an injection molding machine for molding a molded body such as plastic is roughly composed of a mold clamping unit and an injection unit.

  The aforementioned injection unit is used when pellets, which are granular resin, are supplied as molten resin to the cavity formed during mold clamping described above. The injection unit includes a motor serving as a drive source and a motor. Ball screw mechanism that transmits rotational force sequentially through pulleys, belts, etc., and converts rotational motion into linear motion, heating cylinder equipped with a screw that is rotated through the ball screw mechanism and an injection nozzle at the tip, etc. In general injection molding machines, these injection mechanism parts excluding the heating cylinder are covered with a cover so as not to be exposed to the outside from the viewpoint of safety and aesthetics.

  As related to the above technique, Patent Document 1 discloses an injection molding machine in which a rotary drive motor configured in an injection unit is arranged in an injection unit cover and the inside is sealed by the injection unit cover.

JP 2001-198920 A

  The injection unit cover in Patent Document 1 is gas-inflowing and has airtightness. Since such an injection unit cover has an integral structure that is integrally formed as a whole, rather than having a split structure, in order to maintain internal airtightness, maintenance of the rotary drive motor and the like provided in the injection unit cover is performed. In some cases, the entire injection unit cover must be removed, which complicates the work and inferior workability. In addition, in the injection unit cover mounted on the machine base, which is entirely formed in a box shape, the front plate, the rear plate, the top plate, and the left and right side plates are screwed, etc. However, if these plates are made of metal thin plates and the injection unit cover is relatively large, the weight may be bent. In order to prevent bending, a reinforcing structure such as a frame is required, and the cost associated with the increase in the number of parts and the provision of the frame are provided in the injection unit cover. There is a situation that it becomes an obstacle when performing maintenance of an injection mechanism such as a motor.

  The present invention has been made in view of the above-described problems, and supports an injection unit cover that covers an injection mechanism configured in the injection unit so that the injection unit cover does not bend easily due to its own weight or the like even with a simple configuration. It is an object of the present invention to provide an injection molding machine that can do this.

The injection molding machine according to the present invention is
A cylindrical heating cylinder provided with a screw inside, an injection nozzle that is attached to the tip of the heating cylinder and injects a molten resin into the cavity of the mold, and is provided at the rear of the heating cylinder, and the cavity of the mold An injection molding machine comprising an injection mechanism that is operated for the purpose of injecting the molten resin, and an injection unit cover that covers the injection mechanism so as not to be exposed to the outside,
The injection unit cover is
A U-shaped cover composed of a front cover, a rear cover, and a top cover integrally connecting these upper parts;
A plate-shaped side cover that covers both opposite sides of the U-shaped cover;
Each of the facing side covers is divided into a plurality of parts, and by fastening the adjacent parts of the divided covers so as to overlap each other in the vertical direction, the double fastening in the vertical direction is performed. The support structure for suppressing the bending of the letter-shaped cover is configured to increase the rigidity of the entire injection unit cover.

Furthermore, the injection molding machine of the present invention is
A locking claw is formed on the side cover attached to the side of the U-shaped cover,
The U-shaped cover and the side cover are integrally connected in a state where the latching claw of the side cover is locked in the hole formed in the U-shaped cover.

Furthermore, the injection molding machine of the present invention is
A hole is formed in the side cover attached to the side of the U-shaped cover,
The U-shaped cover and the side cover are integrally connected in a state where locking claws formed on the U-shaped cover are locked in holes of the side cover.

Furthermore, the injection molding machine of the present invention is
The injection mechanism section includes at least an injection motor for advancing a screw provided in the heating cylinder when the molten resin is injected into the cavity of the mold, and a driving force of the injection motor to the screw. And a measuring motor for rotating the screw when measuring the molten resin injected into the cavity of the mold.

  According to the present invention, the adjacent portions of the divided cover are fastened so as to be doubled in the vertical direction by fastening means such as bolts, so that the double fastening portion in the vertical direction has a U-shape. Since it can function as a support structure like a frame for suppressing the bending of the mold cover, the rigidity of the entire injection unit cover can be increased. Therefore, since it is not necessary to provide a dedicated frame for supporting the injection unit cover, the cost can be reduced with the reduction in the number of parts, while the injection with a simple configuration accompanying the reduction in the number of parts. Even if it is a unit cover, the rigidity of the injection unit cover can be improved.

  Furthermore, when the U-shaped cover and the side cover are locked and integrated, the locking claw or hole formed in the side cover and the hole or locking claw formed in the U-shaped cover are locked. As a result, the number of bolts for fastening the U-shaped cover and the side cover can be reduced. Therefore, an increase in the number of parts can be suppressed, and the side cover can be easily attached to the U-shaped cover in a short time, and workability can be improved.

It is a perspective view which shows the state which looked at the injection unit in the injection molding machine of an example of this invention from the front. It is a right view which shows the state which looked at the injection unit from the left side. It is a perspective view which shows the state which looked at the injection unit from back. It is a disassembled perspective view which shows the state which looked at injection | emission from the front. It is an expanded sectional view which shows the state which latched the side cover to the U-shaped cover.

  Embodiments of the present invention will be described below with reference to FIGS. Of course, it goes without saying that the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  1 to 4 show an injection unit 1 configured in an injection molding machine. As shown in FIG. 1, a cylindrical heating cylinder 3 and a heating cylinder 3 are mounted on the top of the machine base 2. Injection nozzle 4, screw 5 provided inside the heating cylinder 3, heating cylinder mounting bracket 6 incorporating the base end side of the screw 5, heating cylinder control box 7, metering motor 8, injection motor 9, ball screw mechanism When the screw 5 provided inside the heating cylinder 3 is rotated, the resin supplied to the rear part of the heating cylinder 3 is heated by the injection nozzle 4. The molten resin fed into the heating cylinder 3 and heated in the heating cylinder 3 is squeezed by a metering motor 8. After the-menu 5 are metered by being rotated, the injection motor 9 a predetermined amount of molten resin into the cavity of the mold is injected by advancing the screw 5 through a drive transmission mechanism 10. In addition, outside the injection mechanism unit 12 which is operated for the purpose of injecting molten resin into the mold cavity, which includes the weighing motor 8, the injection motor 9, the drive transmission mechanism 10, and the like, these are externally provided. An injection unit cover 15 made of metal and covered so as not to be exposed is provided.

  Here, the injection unit cover 15 will be described. The injection unit cover 15 is provided in consideration of safety for the user who uses the injection molding machine, prevention of scattering of oil and fat from the injection unit 1, or aesthetics. The injection unit cover 15 of the present embodiment includes a lower cover 26 that is attached to the heating cylinder mounting bracket 6 and disposed immediately above the machine base 2, and a front cover 16a that is screwed to the rear portion of the heating cylinder mounting bracket 6. And a U-shaped cover 16 comprising a rear cover 16b screwed to the rear of the lower cover 26 and a top cover 16c integrally connecting these upper portions, and opposite side surfaces of the U-shaped cover 16 It is comprised from the plate-shaped right and left side surface cover 17 to cover. Note that a slide bar (not shown) extending rearward is fixed to the lower cover 26 attached to the heating cylinder mounting bracket 6, and the slide bar is slidably held on the machine base 2. .

  Since the right and left side covers 17 and 17 have substantially the same configuration, the description of the right side cover 17 is omitted, and the left side cover 17 will be described below as the side cover 17. The side cover 17 is a front side cover. 17a and a rear side cover 17b, which are configured to be separable. Side cover attachment holes 18 formed in the front side cover 17a and the rear side cover 17b, and a side cover formed in the lower cover 26, respectively. The mounting screw holes 20 are overlapped with each other, and the first bolts 21 are inserted through them. Further, the rear side cover mounting holes 18 on the rear side cover 17b and the rear cover 16b of the U-shaped cover 16 are formed. The U-shaped cover mounting screw holes 19 are overlapped with each other, and the third bolts 27 are inserted through these, so that the U-shaped cover 16 and the U-shaped cover 16 are inserted. Side cover 17 is fixed to the lower cover 26.

  In addition, the front side cover 17a and the rear side cover 17b are formed with locking claws 24 that are locked in the holes 22 formed in the U-shaped cover 16, as shown in FIGS. ing. The hole 22 formed in the U-shaped cover 16 has a trapezoidal shape, and the upper base is disposed in front (front side of the shooter molding machine), and the lower bottom longer than the upper base is rear (back of the shooter molding machine). When the front side cover 17a and the rear side cover 17b are assembled to the U-shaped cover 16 integrally, the locking claw 24 has a distal end located at the front and a proximal end located at the rear. First, after the front side cover 17a is slid from the rear to the front, the locking claw 24 of the front side cover 17a is locked to the hole 22 of the U-shaped cover 16, and similarly, the rear side cover 17b is slid from the rear to the front, and the locking claw 24 of the rear side cover 17b is locked to the hole 22 of the U-shaped cover 16, so that the U-shaped cover 16 and the lower cover 26 are Then, the side cover 17 is fixed. In FIG. 5, the front is the left side and the rear is the right side.

  A side cover 17 including a front side cover 17 a and a rear side cover 17 b is locked to the U-shaped cover 16, and the first and third bolts 21 and 27 are attached to the U-shaped cover 16 and the lower cover 26. When in the fixed state, the front side cover 17a and the rear side cover 17b adjacent to each other in the front-rear direction (vertical part at the approximate center of the side cover shown in FIG. 2) overlap each other. (The rear side cover 17b overlaps the outside of the front side cover 17a), and the overlapping part is firmly and integrally fastened by fastening means including the second bolt 25 and a nut (not shown). The double structure serves as a support structure that suppresses the bending of the U-shaped cover 16 and increases the rigidity of the entire injection unit cover.

  According to the injection molding machine in the present embodiment as described above, the cylindrical heating cylinder 3 provided with the screw 5 therein, and the injection that is attached to the tip of the heating cylinder 3 and injects the molten resin into the mold cavity. An injection unit cover that is provided at the rear of the nozzle 4 and the heating cylinder 3 and operates for the purpose of injecting molten resin into the cavity of the mold, and covers the injection mechanism 12 so as not to be exposed to the outside The injection unit cover 15 includes a front cover 16a, a rear cover 16b, and a U-shaped cover 16 including a top cover 16c that integrally connects these upper covers, The left and right side covers 17, 17 that cover the opposite side surfaces of the letter-shaped cover 16 are configured, and each of the opposite side covers 17, 17 has a front side cover 17a. The rear side cover 17b is divided into a plurality of parts, and the adjacent parts of the front side cover 17a and the rear side cover 17b, which are the divided covers, are fastened so as to be doubled vertically. The double fastening in the vertical direction is a supporting structure that suppresses the bending of the U-shaped cover 16. Accordingly, the adjacent portions of the front side cover 17a and the rear side cover 17b, which are split covers, are fastened so as to be overlapped in the vertical direction by fastening means including the second bolts 25 and the like. The vertical double fastening portion can function as a support structure such as a frame for preventing the U-shaped cover 16 from being bent, so that the rigidity of the entire injection unit cover can be increased. Become. Therefore, since it is not necessary to provide a dedicated frame for supporting the injection unit cover 15, the cost can be reduced with a reduction in the number of parts, while a simple configuration with a reduction in the number of parts can be achieved. Even if the injection unit cover 15 has a thin plate shape, the rigidity of the injection unit cover 15 can be improved.

  Further, when the U-shaped cover 16 and the side cover 17 are integrated, the locking claw 24 formed in the side cover 17 and the hole 22 formed in the U-shaped cover 16 are locked. The number of bolts for fastening the U-shaped cover 16 and the side cover 17 can be reduced. Therefore, an increase in the number of parts can be suppressed, and the attaching operation of the side cover 17 to the U-shaped cover 16 can be easily performed in a short time, and workability can be improved. In addition, since the side cover 17 has a divided structure, even the side cover 17 having a relatively heavy weight can be easily attached and detached.

  As mentioned above, although an example of this embodiment was explained in full detail, this invention is not limited to the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, in this embodiment, the locking claw 24 formed on the side cover 17 is locked in the hole 22 formed in the U-shaped cover 16. The side cover 17 may be locked to the U-shaped cover 16 by forming the mold cover 16 and forming the hole 22 in the side cover 17.

DESCRIPTION OF SYMBOLS 1 Injection unit 2 Machine stand 3 Heating cylinder 4 Injection nozzle 5 Screw 6 Heating cylinder mounting bracket 7 Heating cylinder control box 8 Measuring motor 9 Injection motor 10 Drive transmission mechanism 12 Injection mechanism part 15 Injection unit cover 16 U-shaped cover 16a Front cover 16b Rear cover 16c Top cover 17 Side cover 17a Front side cover 17b Rear side cover 18 Side cover mounting hole 19 U-shaped cover mounting screw hole 20 Side cover mounting screw hole 21 First bolt 22 U-shaped Hole part of cover 16 24 Claw 25 Second bolt 26 Lower cover 27 Third bolt

Claims (4)

A cylindrical heating cylinder provided with a screw inside, an injection nozzle that is attached to the tip of the heating cylinder and injects a molten resin into the cavity of the mold, and is provided at the rear of the heating cylinder, and the cavity of the mold An injection molding machine comprising an injection mechanism that is operated for the purpose of injecting the molten resin, and an injection unit cover that covers the injection mechanism so as not to be exposed to the outside,
The injection unit cover is
A U-shaped cover composed of a front cover, a rear cover, and a top cover integrally connecting these upper parts;
A plate-shaped side cover that covers both opposite sides of the U-shaped cover;
Each of the facing side covers is divided into a plurality of parts, and by fastening the adjacent parts of the divided covers so as to overlap each other in the vertical direction, the double fastening in the vertical direction is performed. An injection molding machine configured to increase the rigidity of the entire injection unit cover as a support structure for suppressing bending of the letter-shaped cover. A locking claw is formed on the side cover attached to the side of the U-shaped cover,
2. The U-shaped cover and the side cover are integrally connected in a state in which a locking claw of the side cover is locked in a hole formed in the U-shaped cover. The injection molding machine described. A hole is formed in the side cover attached to the side of the U-shaped cover,
2. The U-shaped cover and the side cover are integrally connected in a state where a locking claw formed on the U-shaped cover is locked in a hole of the side cover. The injection molding machine described.   The injection mechanism section includes at least an injection motor for advancing a screw provided in the heating cylinder when the molten resin is injected into the cavity of the mold, and a driving force of the injection motor to the screw. A drive transmission mechanism for transmitting to the mold and a measuring motor for rotating the screw when measuring the molten resin injected into the cavity of the mold are configured. The injection molding machine according to any one of the above.

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