JP2014198479A - Cleaning rod of heating cylinder in injection molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy removal of dirt adhering to the inside of a heating cylinder in accordance with operation of an injection molding machine.SOLUTION: In a cleaning rod of a heating cylinder 10 in an injection molding machine 1 comprising a cylindrical heating cylinder 10, a screw 12 installed inside the heating cylinder 10, a support member 13 rotatably supporting the screw 12, rotational drive means rotating the screw 12 supported by the support member 13 during a molten resin measuring step, and advance-and-retreat drive means advancing the screw 12 at the time of an injection step after completion of the measuring step to inject a molten resin from an injection nozzle 11 into a cavity of a closed metal mold, a cleaning rod 20, which is mounted with a wire brush 21 on its outer periphery and can be divided into plural parts, is attached instead of the screw 12, so that the inside of the heating cylinder 10 can be cleaned by rotating the wire brush 21 by movement during the measuring step and the injection step.

Description

  The present invention relates to a cleaning rod for a heating cylinder in an injection molding machine that injects a resin melted in a heating cylinder into a cavity of a mold that is closed, and in particular, facilitates cleaning of the heating cylinder in which a thermoplastic resin is melted. The present invention relates to a cleaning rod for a heating cylinder in an injection molding machine.

  In a general injection molding machine that has been used in the past, a granular thermoplastic resin as a raw material is fed into a heating cylinder, and the resin at the tip of the screw is melted by a reciprocating screw provided in the heating cylinder. Sending to the nozzle side, injecting molten resin from the injection nozzle provided on the tip side of the screw into the cavity of the mold device, cooling and solidifying the molten resin in the cavity, then opening the mold device, protruding pins etc. The molded product is molded by removing the molded product attached to the mold from the mold.

  Such an injection molding machine that molds a molded body such as plastic is roughly composed of a mold clamping unit and an injection unit. In the mold clamping unit, a fixed mold is generally used. A mold composed of a movable mold is provided, and the mold of the mold is moved by moving the movable mold forward and backward with respect to the fixed mold by a movable means such as a toggle mechanism or a direct pressure method. Opening and closing is performed.

  The above-described injection unit is used when pellets, which are granular resins, are supplied as molten resin to the cavity formed when the mold is clamped, and the injection unit is driven by a motor as a drive source. Means to transmit the rotational force of the motor sequentially via pulleys, belts, etc., while conveying the molten resin by rotating the screw in the heating cylinder by a ball screw mechanism etc. that converts the rotational motion into linear motion After the measurement, the molten resin is injected into the cavity of the mold that has been clamped as the screw is advanced.

  By the way, when the molded body is repeatedly molded by an injection molding machine, dirt is attached to the heating cylinder due to gas burning of the molten resin, and it is necessary to periodically clean it. When cleaning, there is a fact that the screw inserted into the heating cylinder was pulled out and the wire rod was attached to the tip of a long rod, and it was cleaned manually or with an electric drill When cleaning the inside of the heating cylinder by hand, it is not preferable because uneven cleaning may occur. Also, a rod with a wire brush attached to an electric drill is attached and heated. When cleaning is performed by inserting the cylinder into the cylinder, there is a concern about the safety of the operator's hands and clothes as the electric drill rotates.

  As related to the above technique, Patent Document 1 is configured such that gas generated inside a heating cylinder, which is a heating cylinder, can be sucked and released to the atmosphere, and tar-like materials are hardly generated in the heating cylinder. Thus, an injection molding machine is disclosed in which the inside of the heating cylinder can be easily cleaned.

JP 2009-137114 A

  In Patent Document 1, it may be possible to make it difficult for dirt to adhere to the inside of the heating cylinder by sucking the gas generated inside the heating cylinder and releasing it to the atmosphere. When molding is performed, dirt remains in the heating cylinder, and the frequency of cleaning may be reduced. However, in order to prevent defects such as molding defects, the heating cylinder is regularly removed. It is necessary to clean the dirt inside.

  The present invention has been made in view of the above problems, and heating in an injection molding machine that can reliably and easily remove dirt associated with the burning of the resin adhering to the heating cylinder as the injection molding machine operates. An object is to provide a cleaning rod for a cylinder.

The invention relating to the cleaning rod of the heating cylinder in the injection molding machine,
A cylindrical heating cylinder, a screw provided in the heating cylinder, a support member that rotatably supports the screw, and a rotation that rotates the screw supported by the support member during a molten resin measuring step Advancing and retreating to advance the screw in order to inject molten resin from the injection nozzle attached to the tip of the heating cylinder into the mold cavity closed during the injection process after the metering process and the driving means In a cleaning rod of a heating cylinder in an injection molding machine provided with a driving means,
The cleaning rod is provided with a cleaning brush on the outer periphery, is configured to be divided, and is formed by connecting and integrating a plurality of the cleaning rods.

Furthermore, the invention relating to the cleaning rod of the heating cylinder in the injection molding machine is
The cleaning rod is attached to the support member instead of the screw.

Furthermore, the invention relating to the cleaning rod of the heating cylinder in the injection molding machine is
The cleaning rod has a plurality of brush shafts with male threads formed at both ends,
When the male screw of the adjacent brush shaft with which the end portions of the brush shaft are in contact with each other is integrated with the connecting nut,
A sleeve fixing nut is fixed to the male screw of the brush shaft positioned before and after the connecting nut so that the brush shaft is not screwed off from the connecting nut with the rotation of the cleaning rod. .

Furthermore, the invention relating to the cleaning rod of the heating cylinder in the injection molding machine is
A brush nut integrally provided with the cleaning brush is screwed onto an outer periphery of the connection nut, and a brush fixing nut positioned before and after the brush nut so that the brush nut is not unscrewed from the connection nut. The brush nut is fixed by the above.

  According to the present invention, the screw supported by the support member is removed, and instead the cleaning rod with the cleaning brush attached is attached, and the rotational drive for rotating the screw is used when manufacturing a molded product. The cleaning brush attached to the cleaning rod can be operated by the advancing / retreating drive means for advancing and retracting the means and the screw, and the dirt on the inner surface of the heating cylinder can be removed. Therefore, it is possible to clean surely and easily by scraping the dirt on the inner surface of the heating cylinder with a cleaning brush by using the above-mentioned means of the injection molding machine without using manual work or an electric drill as in the conventional case. It is possible to improve safety.

  Furthermore, since the cleaning rod is formed by connecting and integrating a plurality of cleaning rods and is configured to be separable, when the long cleaning rod is inserted into and removed from the heating cylinder, it is appropriately divided or connected. Can improve the exchange workability when changing from a screw to a cleaning stick equipped with a cleaning brush, and the injection stroke of the screw in the injection process is fixed, but the cleaning stick can be divided Therefore, it is possible to perform cleaning over the entire area of the heating cylinder by appropriately changing the number of the cleaning rods connected or the like.

  In addition, the cleaning rod with the cleaning brush is operated by a rotating operation when performing a weighing process and a forward operation when performing an injection process. The dirt on the inner surface of the heating cylinder can be removed using a cleaning brush.

  Furthermore, since the cleaning brush can be rotated in the forward and reverse directions, dirt on the inner surface of the heating cylinder can be more reliably removed.

  Furthermore, since the cleaning brush can be further moved forward while rotating the cleaning brush in either the forward or reverse direction, the combined operation of the rotating operation and the forward operation can further ensure the inner surface of the heating cylinder. It is possible to remove the dirt, and it is possible to shorten the time required for removing the dirt by performing the rotation operation and the forward movement operation in parallel instead of performing the rotation operation and the forward movement operation separately. .

It is a schematic block diagram which shows the injection molding machine of an example of this embodiment. It is a block diagram which shows the state which mounted | wore the support member comprised in an injection molding machine with the screw. It is a block diagram which shows the state which mounted | wore the supporting member comprised in an injection molding machine with the cleaning stick.

  Embodiments of the present invention will be described below with reference to FIGS. Needless to say, the present invention can be easily applied to configurations other than those described in the embodiments without departing from the spirit of the invention.

  As shown in FIG. 1, an injection molding machine 1 according to an example of this embodiment includes a machine base 2, and an injection unit 3 and a mold clamping unit 4 are disposed on the machine base 2.

  The mold clamping unit 4 includes a mold opening / closing mechanism that moves the movable mold 6 forward and backward with respect to the fixed mold 5 to perform mold clamping (mold closing) and mold opening. As the mold opening / closing mechanism in the present embodiment, The toggle link mechanism 7 is bent using the driving force of the motor as a drive source, so that the movable mold 6 fixed to the movable die plate 9 is repeatedly opened and closed with respect to the fixed mold 5 fixed to the fixed die plate 8. To do.

  The injection unit 3 includes a cylindrical heating cylinder 10, an injection nozzle 11 provided at the tip of the heating cylinder 10, a screw 12 provided inside the heating cylinder 10, and a support member 13 that rotatably supports the screw 12. A hopper 14 into which a granular resin (pellet) as a raw material is charged, a hopper block 15 provided with the hopper 14, and the like are configured. When the screw 12 provided inside the heating cylinder 10 is rotated, The resin supplied to the rear part of the heating cylinder 10 is sent to the front end side of the heating cylinder 10 provided with the injection nozzle 11, and is supplied into the heating cylinder 10 and melted in the heating cylinder 10. The resin was weighed by rotating the screw 12 by a rotation driving means (not shown) composed of a metering motor or the like. , Not shown, the injection motor, a predetermined amount of molten resin into the mold cavity by the screw 12 is advanced by the advancing drive means comprising a ball screw mechanism or the like is emitted. A heater 16 is provided outside the heating cylinder 10 as shown in FIG. 1, and the resin supplied to the inside of the heating cylinder 10 is melted by heating the heater 16 to a high temperature. It has become so.

  Further, as shown in FIG. 2, the screw 12 has a spline portion 17 at the rear end thereof fitted to the support member 13, and screw fixing for holding the spline portion 17 from falling out of the support member 13. The plate 18 is fixed to the support member 13 with bolts 19. When the screw 12 is removed from the support member 13, the bolt 19 is unscrewed from the support member 13 and the screw fixing plate 18 is removed, as shown in FIG. 2. It can be removed by pulling out the screw 12 in the left direction.

  Here, the cleaning rod 20 attached in place of the screw 12 in order to remove dirt in the heating cylinder 10 will be described with reference to FIG. As shown in the figure, a wire brush 21 as a cleaning brush is attached to the outer periphery of the cleaning rod 20. The cleaning rod 20 has a rotating shaft 22 at the rear portion, and a spline portion 23 having the same shape as the spline portion 17 of the screw 12 described above is formed at the rear end thereof. The spline portion 23 of the cleaning rod 20 can also be fitted to the support member 13, and a screw fixing plate 18 that can be held so that the spline portion 23 of the cleaning rod 20 does not come out of the support member 13 is supported by the bolt 19. It is fixed to the member 13. Then, when removing the cleaning rod 20 from the support member 13, the bolt 19 is unscrewed and the screw fixing plate 18 is removed in the same manner as when removing the screw 12, and then the cleaning rod 20 is moved in the left direction shown in FIG. It can be removed by pulling it out.

  In addition, the front portion of the rotating shaft 22 has a brush shaft 25 that can divide the cleaning rod 20 into a plurality of parts, and male screws 25a are formed at both ends of the brush shaft 25. One of the brush shafts 25 adjacent to the rotating shaft 22 is screwed into a female screw 22 a at the tip of the rotating shaft 22 and fixed so as not to rotate by a nut 26. Moreover, the male screw 25a of the adjacent brush shaft 25 with which each end part contact | abutted is screwed by the connection nut 27, and when the cleaning rod 20 rotates, the brush shaft 25 screw | threads from the connection nut 27. As shown in FIG. Further, a sleeve fixing nut 29 is fixed to the male screw 25a of the brush shaft 25 positioned before and after the connecting nut 27 so as not to be removed.

  Further, a brush nut 28 integrally provided with the wire brush 21 is screwed onto the outer periphery of the connection nut 27, and is positioned before and after the brush nut 28 so that the brush nut 28 is not unscrewed from the connection nut 27. A brush nut 28 is fixed by a brush fixing nut 30.

  As described above, according to the injection molding machine 1 of the present embodiment, in the injection molding machine 1 for injecting molten resin from the injection nozzle 11 attached to the tip of the heating cylinder 10 into the mold cavity, A cylindrical heating cylinder 10, a screw 12 provided in the heating cylinder 10, a support member 13 that rotatably supports the screw 12, and a screw 12 that is supported by the support member 13 are measured with molten resin. Rotation drive means for rotating in the process, and advance / retreat drive means for advancing the screw 12 to inject the molten resin from the injection nozzle 11 into the mold cavity as the injection process after finishing the metering process. When the inside of the heating cylinder 10 is cleaned, a wire brush 21 as a cleaning brush is attached to the outer periphery instead of the screw 12 The cleaning rod 20 is intended to be attached to the support member 13. Thereby, the screw 12 supported by the support member 13 is removed, and instead the cleaning rod 20 to which the wire brush 21 is attached is attached, so that the screw 12 used for manufacturing a molded product is rotated. The wire brush 21 attached to the cleaning rod 20 can be operated by the rotation driving means and the advance / retreat driving means for moving the screw 12 back and forth, and the dirt on the inner surface of the heating cylinder 10 can be automatically removed. Therefore, the means of the injection molding machine 1 is also used, and the dirt on the inner surface of the heating cylinder 10 is scraped off with the wire brush 21 by using the operations performed in the weighing process and the injection process, thereby reliably and easily cleaning. In addition, since the inside of the heating cylinder 10 can be automatically cleaned without using a manual operation or an electric drill as in the prior art, a complicated manual cleaning operation or an electric drill can be used. Involvement of hands and clothes can be avoided, and safety can be improved.

  Further, since the cleaning rod 20 is formed by connecting and integrating a plurality of the cleaning rods 20 and is configured to be divided, the cleaning rod 20 is appropriately divided when the long cleaning rod 20 is inserted into and removed from the heating cylinder 10. By connecting or connecting, it is possible to improve the exchange workability when the screw 12 is replaced with the cleaning rod 20 to which the wire brush 21 is attached, and the injection stroke of the screw 12 in the injection process is determined. However, since the cleaning rod 20 can be divided, it can be cleaned over the entire area of the heating cylinder 10 by appropriately changing the number of couplings of the cleaning rod 20 to be reduced or increased.

  Furthermore, since the cleaning rod 20 to which the wire brush 21 is attached can be operated by a rotating operation at the time of the metering process or a forward operation at the time of performing the injection process, the screw 12 used when the molded body is formed. By using the rotation operation and the forward operation, the wire brush 21 can be used to easily remove the dirt on the inner surface of the heating cylinder 10.

  Furthermore, since the rotation driving means in the present injection molding machine 1 can rotate the cleaning rod 20 in either the forward or reverse direction, the cleaning rod 20 has a normal rotation direction when performing the weighing process, and The inner surface of the heating cylinder 10 can be cleaned by rotating the wire brush 21 attached to the cleaning rod 20 in the forward and reverse directions. After the brush 21 is rotated in the forward direction, the dirt on the inner surface of the heating cylinder 10 can be more reliably removed by rotating in the reverse direction.

  Furthermore, in the present injection molding machine 1, the wire brush 21 can be moved forward while the wire brush 21 is rotated in either the forward or reverse direction. By the combined operation, the dirt on the inner surface of the heating cylinder 10 can be more reliably removed, and the rotation operation and the forward operation are not performed separately, but the rotation operation and the forward operation are performed in parallel. The time required for removing dirt can be shortened.

  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, when cleaning the inside of the heating cylinder 10, the point of using the forward movement operation when performing the injection process has been described above. However, the forward / backward drive means for moving the cleaning rod 20 forward includes a ball screw mechanism and the like. The cleaning rod 20 can be moved backward by rotating the motor in the direction opposite to the rotation direction during the injection process. Therefore, while rotating the wire brush 21, the wire brush 21 may be moved backward as well as forward, and the forward movement and the backward movement are repeated according to the state of adhesion of dirt in the heating cylinder 10. You may make it perform.

1 Injection molding machine 5 Fixed mold (mold)
6 Movable mold (mold)
DESCRIPTION OF SYMBOLS 10 Heating cylinder 11 Injection nozzle 12 Screw 13 Support member 20 Cleaning stick 21 Wire brush (washing brush)

Claims (4)

A cylindrical heating cylinder, a screw provided in the heating cylinder, a support member that rotatably supports the screw, and a rotation that rotates the screw supported by the support member during a molten resin measuring step Advancing and retreating to advance the screw in order to inject molten resin from the injection nozzle attached to the tip of the heating cylinder into the mold cavity closed during the injection process after the metering process and the driving means In a cleaning rod of a heating cylinder in an injection molding machine provided with a driving means,
The cleaning rod is provided with a cleaning brush on the outer periphery, is configured to be divided, and is formed by connecting and integrating a plurality of the cleaning cylinders in the injection molding machine. Cleaning stick.   The cleaning rod for a heating cylinder in an injection molding machine according to claim 1, wherein the cleaning rod is attached to the support member instead of the screw. The cleaning rod has a plurality of brush shafts with male threads formed at both ends,
When the male screw of the adjacent brush shaft with which each end of the brush shaft is in contact is screwed into the connecting nut and integrated,
A sleeve fixing nut is fixed to the male screw of the brush shaft positioned before and after the connecting nut so that the brush shaft is not screwed off from the connecting nut with the rotation of the cleaning rod. A cleaning rod for a heating cylinder in the injection molding machine according to claim 1 or 2.   A brush nut integrally provided with the cleaning brush is screwed onto an outer periphery of the connection nut, and a brush fixing nut positioned before and after the brush nut so that the brush nut is not unscrewed from the connection nut. The cleaning rod of the heating cylinder in the injection molding machine according to claim 3, wherein the brush nut is fixed by means of the above.

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