JP2009056645A - Injection molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form an external protective cover required to satisfy European safety specification "CE" to be high in versatility to be usable for a heating cylinder of different shape. <P>SOLUTION: This injection molding machine is constituted to cover the heating cylinder double with an internal protective cover and an external protective cover. The external protective cover is composed of a first external cover body with one end side fixed to a holding block, and a second external cover body slidable relative to the first external cover body, and the entire length of the external protective cover is variably set according to the shape of the heating cylinder. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an in-line screw type injection molding machine in which a screw is disposed in a heating cylinder so as to be able to rotate and move forward and backward, and more particularly, to a technique related to a protective cover of the heating cylinder.

  In an in-line screw type injection molding machine, heat is applied to protect the band heater and temperature sensor wound around the outer periphery of the heating cylinder and to prevent the outside air from taking excessive heat from the heating cylinder. In many cases, a protective cover is provided to cover the upper side and the side of the cylinder. Since this protective cover is heated to a temperature of about 100 ° C due to heat radiation from the heating cylinder, it is dangerous to touch the protective cover carelessly. It is desired that the temperature of the part that is easy to touch is lower than 100 ° C., and in the European safety standard “CE”, the temperature of the part that can be touched by hands around the heating cylinder should be 65 ° C. or less. It is prescribed. Therefore, in-line screw type injection molding machines for European specifications are provided with double protective covers to satisfy the above safety standards.

  5-7 is a figure which shows the protective cover etc. in the in-line screw type injection molding machine of the specification for conventional Europe. 5 and 6 are plan views of the vicinity of the heating cylinder, FIG. 5 shows the nozzle touch state, FIG. 6 shows the nozzle back state, and FIG. 7 is a partially omitted view along the line BB in FIG. FIG.

  5-7, 51 is a headstock (heating cylinder holding block), 52 is wound with a plurality of band heaters (not shown) on its outer periphery, and a screw (not shown) can rotate and move forward and backward. A heating cylinder having a base end portion fixed and held to the headstock 51, a nozzle 53 fixed to the distal end side of the heating cylinder 52, and a fixed-side die (not shown) mounted thereon. The fixed die plate 55 is a component of the ball screw mechanism that constitutes a part of the nozzle touch mechanism, and the end of the screw shaft 56 fixed to the fixed die plate 54 is connected to the head stock 51 at one end. An internal protective cover 57, which is fixed and held to cover the upper side and the side of the heating cylinder 52, is fixed and held at one end side to the headstock 51, and the internal protective cover 56 The external protective cover 58, which covers the upper side and the side, is disposed between the internal protective cover 56 and the external protective cover 57, and is a cylindrical portion of the screw shaft 55 (a round bar on which no screw is formed on the screw shaft 55). This is a purge cover that can be slid by being guided by the part. Note that illustration of the sliding engagement portion between the screw shaft 55 and the purge cover 58 is omitted.

  As shown in FIGS. 5 to 7, the heating cylinder 52 is doubly covered with an internal protective cover 56 and an external protective cover 57, so that the temperature of the outer surface of the external protective cover 57 during continuous molding operation is 65 ° C. or less. And the European safety standard “CE” can be cleared.

  5-7, the entire injection system unit including the headstock 51 and the heating cylinder 52 can be moved forward and backward by the nozzle touch mechanism and its drive source, and is shown in FIG. 5 during the molding operation. Thus, the nozzle touch state (the state where the tip of the nozzle 53 is pressed near the resin inlet of the fixed mold not shown) is taken, and the state shown in FIG. 6 is taken in the nozzle back state. When purging (replacement of resin in the heating cylinder 52), the injection system unit takes the nozzle back state shown in FIG. 6, and when this nozzle back state is taken, the purge cover 58 and the fixed die The safety of the worker is ensured by preventing the molten resin discharged from the tip of the nozzle 53 from being scattered by the plate 54 from splashing on the worker. The purge cover 58 for the purpose of preventing the molten resin from scattering to the operator at the time of purging is formed shorter than the internal protective cover 56 and the external protective cover 57, and the purge cover 58 has an end thereof. The permanent magnet provided in the part is normally lightly held by suction (fixed and held to such an extent that it cannot be separated by vibration or impact) by the fixed die plate 54, and the purge cover 58 is manually held against the magnetic force. The purge cover 58 can be slid by hand by pulling it away from the fixed die plate 54.

  As described above, by adopting the configuration shown in FIGS. 5 to 7, the temperature of the part that can be touched by the hands around the heating cylinder 52 can be reduced to 65 ° C. or less, and the European safety standard “CE”. Can be satisfied.

  By the way, the shape of the heating cylinder 52 is uniquely determined according to the screw shape disposed therein (that is, depending on the screw diameter satisfying a predetermined L (full length) / D (diameter) relationship). Thus, the shape of the heating cylinder 52 changes variously depending on the screw diameter. Conventionally, the internal protective cover 56 and the external protective cover 57 are each manufactured according to the shape of the heating cylinder 52 as described above. Here, the configuration in which the external protective cover 57 is omitted from the configurations shown in FIGS. 5 to 7 is a specification for countries other than Europe. For this reason, the internal protective cover 56 is in accordance with the shape of the heating cylinder 52. Even if the protective cover whose shape is uniquely determined is designed and manufactured, the inner protective cover 56 is relatively productive.

  However, if the external protective cover 57 is designed and manufactured as a protective cover whose shape is uniquely determined according to the shape of the heating cylinder 52, the number of external protective covers 57 produced for each type is small. This is problematic in terms of labor and productivity. Furthermore, if there is a request to replace the current heating cylinder unit (heating cylinder, screw, etc.) with a heating cylinder unit with a different shape due to the convenience of local users of injection molding machines shipped to Europe, Domestic injection molding machine manufacturers have requested heating cylinder units and their corresponding internal protective covers 56 are in stock or can be produced in a short time. There are many cases that are not designed, and in order to meet the demands of local users in Europe, it is necessary to start with the design of the external protective cover 57, and it takes a considerable amount of time to meet the demands of local users. is there. Furthermore, even if the local user purchases and owns a different type of heating cylinder unit and the corresponding internal protective cover 56 before the establishment of the safety standard “CE” of 65 ° C. or lower, the above-mentioned already exists. If you replace your own heating cylinder unit, the current external protective cover 57 is too long or too short to be used, and a new external protective cover 57 is designed as described above. There is a problem that it must be produced.

  The present invention has been made in view of the above points, and an object of the present invention is to use an external protective cover necessary for satisfying the European safety standard “CE” for heating cylinders having different shapes. It is to be versatile.

  In order to achieve the above-mentioned object, the present invention is arranged such that a screw can be rotated and moved forward and backward in a heating cylinder whose base end side is fixed to a holding block, and one end side thereof is fixed to the holding block. An injection molding machine comprising: an internal protective cover that covers the upper side and the side of the heating cylinder; and an external protective cover that is fixed at one end to the holding block and covers the upper side and the side of the internal protective cover. The outer protective cover includes a first outer cover body having one end fixed to the holding block, and a second outer cover body that is slidable relative to the first outer cover body. The protective cover is a protective cover whose shape is uniquely determined according to the shape of the heating cylinder, and the external protective cover is a front cover according to the shape of the heating cylinder. By sliding the second outer cover body relative to the first outer cover, its entire length is to be a protective cover that is variably set.

  In the present invention, in the injection molding machine configured to cover the heating cylinder with the inner protective cover and the outer protective cover in a double manner, the inner protective cover is a protective cover that is also used in specifications for countries other than Europe. The internal protective cover is a protective cover whose shape is uniquely determined according to the shape of the heating cylinder, and the external protective cover is a protective cover that is adopted only for European specifications. A first outer cover body, one end of which is fixed to the holding block, and a second outer cover body that is slidable relative to the first outer cover body, and is externally protected according to the shape of the heating cylinder. The total length of the cover is variably set. Therefore, it is not necessary to individually design and manufacture the external protective cover according to the shape of the heating cylinder, and the external protective cover becomes rich in versatility, thereby improving productivity. In addition, it is possible to quickly respond to a request from a European local user who has a desire to replace the heating cylinder unit with a different shape.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 relate to an in-line screw type injection molding machine for Europe according to the present invention, and FIG. 1 illustrates the vicinity of a heating cylinder in a nozzle touch state in a first example of an injection molding machine with a short overall length of a heating cylinder. FIG. 2 is a plan view of the vicinity of the heating cylinder in the nozzle touch state in the second example of the injection molding machine having a long heating cylinder, and FIG. 3 is the first example of the injection molding machine having a short heating cylinder. Fig. 4 is a plan view of the vicinity of the heating cylinder in the nozzle back state, and Fig. 4 is a cross-sectional view of a main part, partially omitted along the line A-A in Fig. 1.

  1, 3, and 4 of the first example with a short overall length of the heating cylinder, 1 is a headstock (heating cylinder holding block), 2A is wound with a plurality of band heaters (not shown) on its outer periphery, A heating cylinder (not shown) is disposed so as to be able to rotate and move forward and backward, and a base end portion of the heating cylinder is fixed and held on the headstock 1. 3A is a nozzle fixed to the front end side of the heating cylinder 2A, Reference numeral 4 denotes a fixed die plate on which a fixed mold (not shown) is mounted. Reference numeral 5 denotes a component of a ball screw mechanism that constitutes a part of the nozzle touch mechanism, and a screw whose end is fixed to the fixed die plate 4. The shaft 6A is an internal protective cover whose one end is fixed and held to the headstock 1 and covers the upper side and the side of the heating cylinder 2A. The internal protective cover 6A has the shape of the heating cylinder 2A. Depending has a protective cover which shape is uniquely determined by the shape of the inner protective cover 6A is a one-to-one correspondence to the shape of the heating cylinder 2A.

  7 is configured so that one end side thereof is fixed and held on the headstock 1 and covers the upper side and the side of various types of internal protective covers including the internal protective cover 6A and the internal protective cover 6B described later. The external protective cover 7 includes a first external cover body 8 having one end fixed to the headstock 1 and a second external cover that is slidable relative to the first external cover body 8. It consists of a body 9. The second outer cover body 9 is guided and slidable by a cylindrical portion of the screw shaft 5 (a portion of a round bar in which no screw is formed in the screw shaft 5), and is slidable with respect to the first outer cover body 8. However, the second outer cover body 9 can be slid by being guided by the first outer cover body 8 by rail coupling having an appropriate rail groove and an engaging portion engaged therewith. Note that the illustration of the slide engagement portion between the screw shaft 5 and the second outer cover body 9 and the rail coupling portion between the first outer cover body 8 and the second outer cover body 9 is omitted. In the present invention, by adjusting the slide position of the second external cover body 9, the total length of the external protective cover 7 is made to coincide with the total length of the various types of internal protective covers on the inside. In the example shown in FIG. 1, the heating cylinder 2 </ b> A and the inner protective cover 6 </ b> A are relatively short in total length, so that almost half of the second outer cover body 9 is in the first outer cover body 8.

  Reference numeral 10 denotes position holding means for holding the slide adjustment position of the second external cover body 9 placed at an appropriate position by sliding movement so as not to be moved by vibration or impact. Here, the position holding means 10 is The first outer cover body 8 is screwed into the screw hole, and the tip of the first outer cover body 8 is constituted by a set screw that can come into contact with the second outer cover body 9. The position holding means 10 may be constituted by a permanent magnet provided at the end of the second external cover body 9. In this case, the second external cover body 9 is lightly held by being held by the fixed die plate 4. Thus, when necessary, the second outer cover body 9 may be slid by hand by pulling the second outer cover body 9 away from the fixed die plate 4 by hand against the magnetic force.

  11 is disposed between the inner protective cover 6A and the outer protective cover 7, and is guided by a cylindrical portion of the screw shaft 5 (a portion of a round bar on which the screw is not formed on the screw shaft 5) within a predetermined range. The purge cover 11 is a slidable purge cover, and the purge cover 11 is usually lightly attracted and held on the fixed die plate 4 by a permanent magnet provided at the end thereof (adsorbed and held so as not to be separated by vibration or impact). The purge cover 11 can be slid by hand by pulling the purge cover 11 away from the fixed die plate 4 by hand against the magnetic force. Note that illustration of the sliding engagement portion between the screw shaft 5 and the purge cover 11 is omitted. Reference numeral 11a denotes an engaging protrusion provided on the purge cover 11, and this engaging protrusion 11a can be brought into contact with the end portion 9a of the second outer cover body 9, whereby the first outer cover body 8 can be brought into contact therewith. The second outer cover body 9 that has entered completely can be pulled out by the purge cover 11.

  In FIG. 2 of the second example in which the overall length of the heating cylinder is long, the same components as those in FIGS. 1, 3, and 4 are denoted by the same reference numerals. In FIG. 2, 2B has a plurality of band heaters (not shown) wound around its outer periphery, and a screw (not shown) is disposed inside the headstock 1 so as to be able to rotate and move forward and backward. The fixed and held heating cylinder, 3B is a nozzle fixed to the tip side of the heating cylinder 2B, and 6B is fixed and held at one end of the head stock 1 to cover the upper side and the side of the heating cylinder 2B. The internal protective cover 6B is a protective cover whose shape is uniquely determined according to the shape of the heating cylinder 2B. The shape of the internal protective cover 6B is a pair of the shape of the heating cylinder 2B. Corresponds to 1.

  As described above, by adjusting the slide position of the second outer cover body 9, the overall length of the external protective cover 7 is made to coincide with the total length of various types of internal protective covers inside. In the example shown in FIG. 2, the entire length of the heating cylinder 2 </ b> B and the inner protective cover 6 </ b> B is long, so that the second outer cover body 9 is substantially pulled out from the first outer cover body 8. Yes.

  1 to 4, the entire injection system unit including the headstock 1 and the heating cylinder 2 can be moved forward and backward by a nozzle touch mechanism and its drive source. 2, the nozzle touch state is taken, and in the nozzle back state, for example, the state shown in FIG. 3 is taken. When purging (replacement of resin in the heating cylinder), the injection system unit takes a nozzle back state, and when this nozzle back state is taken, the purge cover 11 and the fixed die plate 4 serve as a nozzle. The safety of the worker is ensured by preventing the molten resin, which may be discharged from the tip of the nozzle, from splashing on the worker.

  As described above, in the present embodiment, in the injection molding machine configured to cover the heating cylinder (2A, 2B, etc.) with the internal protective cover (6A, 6B, etc.) and the external protective cover 7, the internal protection Since the cover (6A, 6B, etc.) is a protective cover that is also used in specifications for countries other than Europe, the inner protective cover (6A, 6B, etc.) can be changed depending on the shape of the heating cylinder (6A, 6B, etc.). As the protective cover whose shape is uniquely determined and the external protective cover 7 is a protective cover that is adopted only in the European specification, the external protective cover 7 is attached to the headstock 1 that is a heating cylinder holding block. A first outer cover body 8 fixed at one end thereof and a second outer cover body 9 slidably movable with respect to the first outer cover body Therefore, the total length of the external protective cover 7 is variably set according to the shape of the heating cylinder, so there is no need to individually design and manufacture the external protective cover according to the shape of the heating cylinder. The external protective cover 7 is rich in versatility, and productivity is improved. In addition, it is possible to quickly respond to a request from a European local user who has a desire to replace the heating cylinder unit with a different shape.

It is a top view of the heating cylinder vicinity of the nozzle touch state in the example with a short full length of the heating cylinder in the in-line screw type injection molding machine for Europe by embodiment of this invention. It is a top view of the heating cylinder vicinity of the nozzle touch state in the example with a long full length of the heating cylinder in the in-line screw type injection molding machine for Europe by embodiment of this invention. It is a top view of the heating cylinder vicinity of the nozzle back state in the example with a short full length of the heating cylinder in the in-line screw type injection molding machine for Europe by embodiment of this invention. It is principal part sectional drawing which abbreviate | omitted one part along AA of FIG. It is a top view of the heating cylinder vicinity of the nozzle touch state in the conventional in-line screw type injection molding machine for Europe. It is a top view of the heating cylinder vicinity of the nozzle back state in the conventional in-line screw type injection molding machine for Europe. It is principal part sectional drawing which abbreviate | omitted partially along the BB line of FIG.

Explanation of symbols

1 Headstock (Heat cylinder holding block)
2A, 2B Heating cylinder 3A, 3B Nozzle 4 Fixed die plate 5 Screw shaft of ball screw mechanism 6A, 6B Internal protective cover 7 External protective cover 8 First external cover body 9 Second external cover body 9a End of second external cover body 9 Part 10 Position holding means of second outer cover body 11 Purge cover 11a Engaging protrusion

Claims (4)

In the heating cylinder whose base end side is fixed to the holding block, the screw is arranged so as to be able to rotate and move forward and backward, and its one end side is fixed to the holding block so that the upper side and the side of the heating cylinder are In an injection molding machine comprising an inner protective cover that covers and an outer protective cover that is fixed at one end to the holding block and covers the upper side and the side of the inner protective cover,
The external protective cover includes a first external cover body whose one end is fixed to the holding block, and a second external cover body that is slidable relative to the first external cover body. Injection molding machine. The injection molding machine according to claim 1,
The inner protective cover is a protective cover whose shape is uniquely determined according to the shape of the heating cylinder, and the outer protective cover is configured to attach the second outer cover body to the second cylinder according to the shape of the heating cylinder. It is a protective cover whose entire length is variably set by sliding with respect to the first outer cover body, and the slide adjustment position of the second outer cover body is held by the position holding means of the second outer cover body. An injection molding machine characterized by that. In the injection molding machine according to claim 1 or 2,
The second external cover body is guided by a cylindrical portion of a screw shaft of a ball screw mechanism of a nozzle touch mechanism and is slidable. In the injection molding machine according to claim 1 or 2,
Between the inner protective cover and the outer protective cover, there is a purge cover that can be guided and slid by a cylindrical portion of a screw shaft of a ball screw mechanism of a nozzle touch mechanism, and the purge cover and the second outer cover body An injection molding machine characterized in that it can be engaged.

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