JP4481097B2 - Injection molding machine - Google Patents

Description

  The present invention relates to an injection molding machine that molds a molded product using a mold, and in particular, when an injection molding machine is operated, a plurality of pulleys provided in the injection molding machine and belts connected to the pulleys. The present invention relates to an injection molding machine that reduces noise generated from the contact area.

  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. After feeding to the nozzle side, the molten resin is injected into the cavity of the mold device from the nozzle provided on the tip side of the screw, and after the molten resin is cooled and solidified in the cavity, the mold device is opened, and a protruding pin etc. The molded product is formed by removing the molded product attached to the mold from the mold.

  Such an injection molding machine for molding a molded product such as plastic is roughly composed of a mold clamping unit and an injection unit, and the mold clamping unit is generally a fixed mold. The movable mold is moved forward and backward with respect to the fixed mold by a movable means that enables the mold to be clamped such as a toggle mechanism or a direct pressure method, and the mold is closed at the time of mold clamping. And mold opening.

In addition, an injection unit is used when pellets, which are granular resins, are supplied as molten resin to the cavity formed when the mold of the mold clamping unit is clamped, and this injection unit is a drive source. Molten resin by rotating the screw in the heating cylinder by a ball screw mechanism, etc., which is equipped with driving means such as a motor, sequentially transmits the rotational force of the motor via a pulley or belt, etc., and converts the rotational motion into linear motion Then, the molten resin is injected from the nozzle into the cavity between the molds provided in the mold clamping unit.

  Further, in Patent Document 1 and the like, in an injection molding machine in which a drive transmission mechanism such as a motor and a pulley is exposed to the outside outside the injection molding machine, when the screw configured in the injection molding machine is rotated. An quiet injection molding machine that reduces noise is disclosed.

JP 2000-190361 A

However, in the injection molding machine in the background art described above, although it is conventionally possible to form a molded article in a short time by simply operating the injection molding machine, the injection molding machine has a series of injection molding processes (cycles). ) Is repeatedly performed by a drive transmission mechanism or the like, so that noise is inevitably emitted from the contact portion of the motor and pulley due to the so-called mechanical noise generated when the pulleys and belts constituting them are rotated. For the operator, there is a problem that the injection molding machine can only be operated for a limited time due to noise and other unpleasant feelings, and various operations of the injection molding machine. Or for the operator who performs fine adjustment of various devices configured in the injection molding machine, the noise becomes annoying, It did not say is the preferred when performing an integer.

  The present invention solves the above-mentioned problems, and reduces the noise generated when the injection molding machine is operating as much as possible, and reduces the noise caused by friction of various devices and parts. The present invention relates to an injection molding machine that has improved quietness with reduced noise.

An injection molding machine according to claim 1 includes a metering drive device for plasticizing and weighing molten resin supplied to a cavity formed between molds, and the molten resin measured by the metering drive device as the cavity. An injection driving device for extruding and injecting, a mold clamping driving device for clamping and opening the mold, and the mold clamping driving device solidified the molten resin in the cavity when the mold is clamped In an injection molding machine provided with an eject drive device that protrudes and removes a molded product when the mold is opened,
A pulley and a timing belt that transmit the driving force of each driving motor that is a driving source of the injection molding machine are configured to be covered with respective noise prevention covers,
As anti-noise cover of the each, the metering drive system as a drive source metering drive of the motor driving force pulley and timing belt and a for preventing noise I covering so as not to be exposed to the outside first transmitting of and noise prevention cover metering drive source, wherein the injection drive unit as a drive source injection drive for transmitting the driving force of the motor pulley and the timing belt and the second for preventing noise I covering the so as not to be exposed to the outside of the anti-noise cover injection driving source, to prevent the mold clamping noise I covering the pulley and the timing belt so as not to be exposed to the outside to transmit the driving source serving clamping driving force of the driving motor of the driving device Each noise prevention cover of the third mold clamping drive source noise prevention cover is provided.

  According to the configuration of claim 1, each of the pulleys that operates when each of the metering drive motor, the injection drive motor, and the mold clamping drive motor that are driven when the molded product is molded by the injection molding machine, and these By covering the timing belts connected to each other with the first to third noise prevention covers so as not to be exposed to the outside, noise noise generated from the contact portion between each pulley and each timing belt can be reduced.

An injection molding machine according to claim 2 is the injection molding machine according to claim 1, wherein each of the noise prevention covers is for the first metering drive source, for the second injection drive source, and for the third mold clamping. In addition to each noise prevention cover for the drive source, the mold clamping unit equipped with the mold clamping drive unit may have the mold clamped during or after mold opening of the mold clamped by the mold clamping drive unit. the contact portion between the pulley and the timing belt for transmitting a driving source serving ejection driving force of the driving motor of the ejection drive removing projecting the molded product is adhered to the mold, I covering so as not to be exposed to the outside A noise prevention cover for the eject drive source for preventing noise is provided.

  According to the configuration of the second aspect, since the noise prevention cover for the eject drive source covers the contact portion between the pulley operated when the eject drive motor is driven and the timing belt connected thereto, these Noise sound generated from the contact portion can be reduced.

An injection molding machine according to a third aspect is the injection molding machine according to the second aspect, wherein the noise prevention cover for the eject drive source includes a plurality of noise prevention covers from the fourth noise prevention cover and the fifth noise prevention cover. It is characterized by comprising.

  According to the configuration of the third aspect, the fourth noise prevention cover and the fifth noise prevention cover cover the contact portion between the pulley that is actuated when the eject driving motor is driven and the timing belt connected thereto. As a result, noise noise generated from these contact parts can be reduced.

According to the invention of the injection molding machine according to claim 1, the metering drive device for plasticizing and weighing the molten resin supplied to the cavity formed between the molds, and the melting measured by the metering drive device An injection driving device for extruding and injecting resin into the cavity; a mold clamping driving device for performing mold clamping and mold opening of the mold; and a molten resin in the cavity when the mold is clamped by the mold clamping driving device In an injection molding machine comprising an ejection drive device that protrudes and removes the solidified molded product when the mold is opened, a pulley and timing for transmitting the driving force of each driving motor as a drive source of the injection molding machine a belt, configured to cover the respective anti-noise cover, as anti-noise cover of the each driving of the driving source serving metering drive motor of the metering drive device A first anti-noise cover metering drive source to prevent noise covering so as not to expose the pulleys and timing belt to the outside to transmit the driving of the driving source serving injection drive motor of the injection driving device pulley and a second anti-noise cover for injection drive sources for preventing noise I covering a timing belt so as not to be exposed to the outside to transmit force, as a drive source mold clamping drive of the mold clamping drive apparatus because provided a third mold clamping driving source for each noise prevention cover noise prevention cover for preventing noise I covering the pulley and the timing belt so as not to be exposed to the outside to transmit the driving force of the motor, the pulleys And the timing belts connected thereto with the first to third noise prevention covers so as not to be exposed to the outside, from the contact portion between each pulley and each timing belt It is possible to reduce the noise sound to live can provide an injection molding machine having excellent quietness.

According to the invention of the injection molding machine according to claim 2, in claim 1, as each of the noise prevention covers, the first metering drive source, the second injection drive source, and the third mold clamping drive. In addition to each noise prevention cover for the source, the mold is clamped by the mold clamping drive device to the mold clamping unit having the mold clamping drive device during or after mold opening. the contact portion between the pulley and the timing belt for transmitting a driving source serving ejection driving force of the driving motor of the ejection drive removing projecting the molded product are adhered to, the noise I covering so as not to be exposed to the outside since providing the ejection driving source for noise prevention cover for preventing, pulleys and timing base that is connected to these to generate an actuated noise sound when removing the molded product stuck to the mold Since the noise prevention cover for the eject drive source covers the contact area with the product, noise noise generated from these contact areas can be reduced, and noise noise associated with the operation of the injection molding machine can be further reduced. Can do.

According to an invention of an injection molding machine according to claim 3, in claim 2, the noise prevention cover for the eject drive source comprises a plurality of noise prevention covers from a fourth noise prevention cover and a fifth noise prevention cover. From the fourth noise prevention cover and the fifth noise prevention cover, the contact parts between the pulleys that are actuated when the eject driving motor is driven and the timing belt connected thereto are covered. Can be reduced, and the noise caused by the operation of the injection molding machine can be further reduced.

  Embodiments as the best mode for carrying out 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.

  FIG. 1 is a side view showing a state in which a mold of an injection molding machine showing an example of the present invention is closed, and FIG. 2 is a plan view showing a state in which the mold of an injection molding machine is closed. As shown in these drawings, the injection molding machine 1 has a machine base 2, and an injection unit 10 and a mold clamping unit 80 are arranged on the machine base 2.

  The configuration of the former injection unit 10 will be described in detail below. As shown in FIG. 5, the injection unit 10 includes a metering drive device 11 that rotates a screw 51 of the injection unit 10 to feed molten resin, and a gold that will be described later. An injection driving device 12 for injecting molten resin into the mold cavity is provided, and a hopper 13 into which resin (pellet) that is a granular raw material is charged is provided above the injection unit 10. A granular resin is dropped by its own weight into a cylindrical heating cylinder 14 provided therebelow.

  The metering drive device 11 rotates the screw 51 and measures the molten resin supplied into the heating cylinder 14 and heated. The metering drive device 11 includes a metering drive motor 15 serving as a drive source. The first pulley 17 fixed to the rotating shaft portion 16 of the motor 15 rotates the second pulley 19 via the timing drive timing belt 18. When the second pulley 19 is rotated, the rear side of the screw 51 is fixed to the central portion of the second pulley 19 according to this rotation, so that the second pulley 19 is rotated in the same direction.

  On the other hand, as shown in FIG. 8, a pair of injection drive motors 20 and 21 serving as drive sources are fixed to the rear support frame 22 mounted on the machine base 2 with screws or the like. A third pulley 25 and a fourth pulley 26 are fixed to the rotary shaft portions 23 and 24 of the injection driving motors 20 and 21, respectively, and the third pulley 25 and the fourth pulley 26 are fixed via the injection driving timing belts 27 and 28, respectively. 5 pulley 29 is rotated. The fifth pulley 29 is formed with a plurality of mounting holes 30, and the fifth pulley 29 is attached to a rotating member 31 pivotally supported in the rear support frame 22. A screw 32 is inserted into the hole 30 and attached. Further, one end of a ball screw portion configured in a ball screw unit to be described later is fixed to the rotating member 31, and rotates in the same direction as the rotating member 31 rotates.

  Here, the ball screw unit will be described. As shown in FIG. 5, as shown in FIG. 5, a cylindrical 4 that connects the front support frame 33 and the rear support frame 22 fixed on the machine base 2 by the fixing screws 3 or the like. A nut portion 41 configured as a ball screw unit is attached to the tie bar 40 so as to be able to advance and retreat (in the left-right direction shown in FIG. 5). Further, the ball screw portion 42 that is guided when the nut portion 41 is advanced and retracted in the front-rear direction is attached to the rotating member 31 with a screw or the like at one end side thereof.

  Further, the ball screw portion 42 is pivotally supported by the rear support frame 22, and when the nut portion 41 is moved relative to the ball screw portion 42 in the axial direction (left and right direction shown in FIG. 5), By repeatedly passing the steel ball while rolling between the groove portions (not shown) formed between the nut portion 41 and the ball screw portion 42, the nut portion 41 smoothly advances and retreats with respect to the ball screw portion 42. is there. A support plate 43 is integrally screwed to the nut portion 41, and holes 44 are formed at the four corners of the support plate 43 corresponding to the positions of the four tie bars 40. The hole portion 44 of the support plate 43 is loosely fitted to the four columnar tie bars 40 that are fixed by connecting the front support frame 33 and the rear support frame 22 described above. The portion 44 is in contact with the portion 44 so as to be slid so as to reduce loss due to friction.

  The bearing member 34 is formed with fitting holes 45 corresponding to the positions of the four tie bars 40, and the fitting holes 45 are loosely fitted to the tie bars 40 along the axial direction of the tie bars 40. The member 34 can advance and retreat.

  The rear end portion of the heating cylinder 14 of the injection unit 10 described above is fixed to the front support frame 33 with screws. The heating cylinder 14 is provided with an inline screw 51 that can rotate in the heating cylinder 14, and a rear end portion of the screw 51 is configured in the metering drive device 11 described above. The screw 51 is fixed to the center of the two pulleys 19 and the screw 51 is rotated by using the metering drive motor 15 of the metering drive device 11 as a drive source. The screw 51 has a function of moving the molten resin between itself and the heating cylinder 14 toward the nozzle 52 at the tip of the screw 51, and also has a function as a plunger that is advanced and injects the molten resin. The nozzle 52 of the injection unit 10 that is inside and disposed at the tip of the screw 51 is screwed into the inside of the tip inside the heating cylinder 14, and a movable mold 84 provided in a mold clamping unit 80 described later. The molten resin is supplied from here to the cavity 81 formed by the fixed mold 83.

  Next, the configuration of the mold clamping unit 80 configured in the injection molding machine will be described below. Reference numeral 80 shown in FIG. 9 and the like is a mold clamping unit including a mold clamping drive device 82 that moves the movable mold 84 forward and backward with respect to the fixed mold 83 to open the mold clamping mold. The mold clamping driving device 82 and an ejection driving device 110 that ejects the molded product P stuck in the movable mold 84 by ejecting the eject pin 120 when the mold is opened are provided.

  Further, the front support frame 85 of the mold clamping unit 80 is placed on the machine base 2, and the fixed die plate 86 of the mold clamping unit 80 is fixed to the machine base 2 with screws. Four cylindrical tie rods 87 are connected between the front support frame 85 and the fixed die plate 86.

  Next, the mold clamping drive device 82 will be described. Reference numeral 90 denotes a mold clamping driving motor which is fixed to the front support frame 85 and is a driving source for clamping the movable mold 84 to the fixed mold 83. In the mold clamping drive device 82, a sixth pulley 91 is rotatably attached to a mold clamping drive motor 90, and is supported by a front support frame 85 via a mold clamping timing belt 92. 7, and a cylindrical shaft portion 94 that is fixed to the seventh pulley 93 and pivotally supported by the front support frame 85 is rotated. The rotational motion is converted into a linear motion, and the driving force is transmitted to the toggle device 100. Then, as shown in FIG. 3, the movable mold 84, which is a state in which the link arm 101 connected to the plurality of arms configured in the toggle device 100 is contracted, is opened to the fixed mold 83. In the operation state shown in FIG. 1 in which the movable mold 84 is closed, the link arm 101 constituting the toggle device 100 is linearly extended as shown in FIG. On the other hand, the movable mold 84 is closed and the mold is clamped. On the other hand, when opening the movable mold 84 that has been closed, the drive transmission mechanism 95 that converts rotational motion into linear motion is driven by the mold clamping drive motor 90 for the operation when the mold is closed. By performing reverse rotation, the movable mold 84 can be opened with respect to the fixed mold 83. In this embodiment, the connecting portion 102 formed at one end of the link arm 101 is rotatably attached to the movable die plate 103, and the linear movement of the toggle mechanism 100 is performed via the movable die plate 103. The movable mold 84 screwed to the movable die plate 103 is moved forward and backward. On the other hand, the fixed mold 83 arranged facing the movable mold 84 is fixed to the fixed die plate 86 by screws.

  Next, the eject driving device 110 of the mold clamping unit 80 will be described. As shown in FIG. 12, in the eject driving device 110 configured in the mold clamping unit 80, an eject driving motor 111 as a driving source is fixed to the movable die plate 103 and advances and retreats together with the movable die plate 103 (shown in FIG. 10). Left and right). In addition, an eighth pulley 112 is rotatably attached to the eject driving motor 111, and the ninth pulley 114 and the tenth pulley 115 shown in FIG. 12 are disposed via an eject driving timing belt 113. Is to be rotated. A fourth noise prevention cover 170 (described later) that covers the eighth pulley 112 so as not to be exposed to the outside is attached to the outside of the eighth pulley 112. Further, as shown in FIG. 13, the ninth and tenth pulleys 114 and 115 are disposed in a cylindrical portion 116 on the front surface side of the movable die plate 103 and are pivotally supported in the movable die plate 103. The ejector drive shaft 117 is pivotally supported. When the ninth and tenth pulleys 114 and 115 are rotated, these rotational motions are converted into linear motions by the drive transmission means 118, and the eject pin 120 is advanced and retracted.

  In addition, a fifth noise prevention cover 180 that covers the ninth and tenth pulleys 114 and 115 so as not to be exposed to the outside is screwed to the movable die plate 103 on the front side (the lower side shown in FIG. 13). At the same time, the cylindrical portion 116 is integrally formed on the movable die plate 103, and the noise generated from the ninth and tenth pulleys 114 and 115 and the ejection driving timing belt 113 is cylindrical. The noise is reduced by covering with the part 116, the fifth noise prevention cover 180, and sixth and seventh noise prevention covers 190, 200 described later. The cylindrical portion 116 is formed with an opening 121 provided for injecting and inspecting grease and the like, and the opening 121 of the cylindrical portion 116 has a respective opening 121, 121. The sixth and seventh noise prevention covers 190 and 200 that cover the screw are screwed so as to close the opening 121 located on the side of the cylindrical portion 116.

  Here, various noise prevention covers that are provided in the injection molding machine 1 in an example of this embodiment and that cover at least each pulley and prevent noise such as mechanical noise will be described in detail below. The first noise prevention cover 140 as the noise prevention cover for the first metering drive source of the injection unit 10 is composed of the first and second pulleys 17 of the metering drive device 11 as shown by a two-dot chain line in FIG. 19 and the first driving pulley 17 which is screwed to the bearing member 34 so as not to expose the metering drive timing belt 18 to the outside, and protrudes from the front side of the bearing member 34 (front side shown in FIG. 7). The second pulley 19 disposed on the inner front surface side of the bearing member 34 and the metering drive timing belt 18 connecting the first pulley 17 and the second pulley 19 are covered. The first noise prevention cover 140 will be further described. The first noise prevention cover 140 includes a first cover 141 that covers the first pulley 17 and a second cover that is provided below the first cover 141. The second cover 142 covers the upper half of the pulley 19, and the third cover 143 covers the lower half of the second pulley 19. And, as shown in FIG. 14, the first to third covers 141, 142, and 143 are integrally arranged in the vertical direction in this way, so that the single weight provided integrally can be reduced. Compared with a heavy cover, the first to third covers 141, 142, and 143 can be easily attached. Further, since the first cover 141 is formed with a long hole 144 through which a screw is inserted, positioning of the long hole 144 with respect to a screw hole (not shown) is facilitated even if the attachment site is high. It is excellent in mounting workability such as screwing.

  Further, as shown in FIG. 6, the second noise prevention cover 150 as the second noise prevention cover for the injection drive source of the injection unit 10 includes the third to fifth pulleys 25, 26, 29 and the first fixing plate 151 formed by bending a flat plate attached so as to close the rear surface of the rear support frame 22 so that the timing belts 27 and 28 for injection driving are not exposed to the outside. The third to fifth pulleys 25 projecting from the first fixed plate 151 to the rear of the injection unit 10 with the edge 152 formed on the periphery of the second noise prevention cover 150 being abutted and screwed. , 26, 29 and injection driving timing belts 27, 28 are provided.

  Further, the third noise prevention cover 160 as the third mold clamping drive source noise prevention cover of the mold clamping unit 80 is the sixth and seventh of the mold clamping unit 80 as shown in FIGS. The third noise prevention cover is attached to the second fixing plate 161 that is attached so as to close the front side of the front support frame 85 so that the pulleys 91 and 93 and the timing belt 92 for mold clamping are not exposed to the outside. The sixth and seventh pulleys 91 and 93 and the mold which are screwed in a state where the edge 162 formed on the peripheral edge of the 160 abuts and protrudes from the second fixing plate 161 to the front side of the mold clamping unit 80. The fastening timing belt 92 is provided so as to cover it.

FIG. 12 is an explanatory diagram showing a state in which the eject driving device 110 is viewed from the front side. As shown in FIGS. 12 and 30, the fourth noise prevention cover 170 of the eject driving device 110 covers the eighth pulley 112 of the eject driving device 110 so as not to be exposed to the outside. The ninth and tenth pulleys 114 and 115 are exposed to the outside by the front wall portion 163, the cylindrical portion 116, and the fifth noise prevention cover 180 of the movable die plate 103. Covered not to. In this way, by covering at least the portion where the eighth, ninth, and tenth pulleys 112, 114, and 115 where noise noise is generated and the ejection driving timing belt 113 are in contact with each other so as not to be exposed to the outside, the ejection is performed. The noise generated from the contact portion between the eighth to tenth pulleys 112, 114, 115 and the ejection driving timing belt 113 due to the rotational driving of the driving motor 111 can be reduced.

  Next, the operation of the injection molding machine will be described. As shown in FIG. 1, in the state where the movable mold 84 is closed to the fixed mold 83 configured in the mold clamping unit 80 of the injection molding machine 1, a granular thermoplastic resin is placed in the hopper 13 of the injection unit 10. When a predetermined operation is performed on an operation panel (not shown) that allows various operations of the injection molding machine 1 to be performed, pellets supplied to the hopper 13 are sequentially brought into the heating cylinder 14 by its own weight. Will be dropped. Then, with the rotational drive of the metering drive motor 15 of the metering drive device 11, the driving force is transmitted from the first pulley 17 to the second pulley 19 via the metering drive timing belt 18, and the second pulley With the rotation of the screw 51 fixed to 19, the pellets are stirred and kneaded while being melted in the heating cylinder 14, and the molten resin is sent to the nozzle 52 side that is the front side of the heating cylinder 14. At this time, the first and second pulleys 17 and 19 and the metering drive timing belt 18 are covered with the first noise prevention cover 140 so as not to be exposed to the outside. Rotational noise caused by the rotational drive of the metering drive motor 15 generated between the metering drive timing belt 18 and the metering drive timing belt 18 can be reduced.

  As the molten resin accumulates on the nozzle side in the heating cylinder 14, the screw 51 is pushed back in the heating cylinder 14 by the pressure of the stored molten resin and slightly retracts. Then, the metering drive motor 15 of the metering drive device 11 is stopped by the metering control means (not shown), the rotation of the screw 51 is stopped, and the injection amount of the molten resin into the cavity 81 is metered.

Next, with the rotational drive of the pair of injection drive motors 20 and 21 of the injection drive device 12, the driving force from the third and fourth pulleys 25 and 26 passes through the injection drive timing belts 27 and 28. When the ball screw portion 42 is rotated via the rotating member 31, the nut portion 41 moves forward together with the bearing member 34 as the ball screw portion 42 rotates (FIG. 1). Left direction shown in FIG. 4), the screw 51 fixed to the second pulley 19 is advanced, and the pressurized and accumulated molten resin on the tip side of the heating cylinder 14 is pushed into the cavity 81, It is injected from the injection port of the fixed die plate 86 into the cavity 81 formed between the movable mold 84 and the fixed mold 83 and injected without a gap. At this time, the second noise prevention cover 150 covers the third, fourth, and fifth pulleys 25, 26, and 29 and the injection driving timing belts 27 and 28 that connect them to the outside so as not to be exposed to the outside. Therefore, it is possible to reduce rotational noise caused by rotational driving of the injection driving motors 20 and 21 from between the third, fourth and fifth pulleys 25, 26 and 29 and the injection driving timing belts 27 and 28. it can.

  When the molten resin is filled in the cavity 81 without any gap, the molten resin filled in the cavity 81 is gradually dissipated from the inner surfaces of the fixed mold 83 and the movable mold 84, cooled, and solidified. P.

  Next, with the rotational driving of the mold clamping drive motor 90 of the mold clamping unit 80, the driving force is transmitted from the sixth pulley 91 to the seventh pulley 93 through the mold clamping timing belt 92, In accordance with the rotation of the pulley 93, the shaft portion 94 fixed integrally therewith is rotated, and the driving force is transmitted to the toggle device 100 after the rotational motion is converted into a straight line by the drive transmission mechanism 95 or the like. Thus, in a state where the movable mold 84 is clamped with respect to the fixed mold 83, the connecting portion 102 of the link arm 101 is attached to the movable die plate 103 with respect to the fixed mold 83. The rotational driving force of the clamping driving motor 90 is sequentially transmitted, and the movable mold 84 is opened. That is, when the link arm 101 is folded and the movable mold 84 is clamped with respect to the fixed mold 83, the link arm 101 is folded and the movable mold 84 is opened. 83, the connecting portion 102 of the link arm 101 is attached to the movable die plate 103, so that the rotational driving force of the mold clamping driving motor 90 is sequentially transmitted, and the movable die 84 is moved to the fixed die 83. The mold is opened. At this time, the sixth and seventh pulleys 91 and 93 are covered by the third noise prevention cover 160 so that the sixth and seventh pulleys 91 and 93 and the clamping timing belt 92 are not exposed to the outside. Rotational noise caused by rotation of the mold clamping drive motor 90 generated between the mold clamping timing belt 92 and the mold clamping timing belt 92 can be reduced.

  Then, at the end or in the middle of the above-described mold opening process, the eject drive motor 111 of the eject drive device 110 is driven to rotate, and the drive force from the eighth pulley 112 passes through the eject drive timing belt 113. 9 and the tenth pulleys 114 and 115, the ejection driving shaft 117 is rotated according to the rotation of the ninth and tenth pulleys 114 and 115, and the molded product P in the movable mold 84 is driven by the drive transmission means 118. The molded product P sticking to the movable mold 84 by ejecting the eject pin 120 is taken out. At this time, the eighth to tenth pulleys 112, 114, 115 and the ejection timing belt 113 are not exposed to the outside by the fourth noise prevention cover 170 and the fifth noise prevention cover 180 as the noise prevention cover for the ejection drive source. In particular, the contact portion between the eighth pulley 112 and the ejection timing belt 113 is covered with a fourth noise prevention cover 170, and the ninth and tenth pulleys 114 and 115 and the ejection belt are ejected. The contact portion with the timing belt 113 is covered with the fifth noise prevention cover 180, and the sixth and seventh noise prevention covers 190 and 200 prevent the openings 121 and 121 of the cylindrical portion 116 from being exposed to the outside. By being covered, the ejection timing belt 113 and the eighth to tenth pulleys 112 and 114 are covered. The rotation noise sound caused by the rotation of the ejection drive motor 111 which is generated from the contact portion with the 115 can be reduced.

  When the molded product P is taken out, the rotational drive of the mold clamping drive motor 90 of the mold clamping unit 80 is rotated in the direction opposite to the rotational direction performed when the mold is opened, and the movable mold is moved relative to the fixed mold 83. The mold 84 is closed from the mold open state, the process of one cycle is completed, and this operation of the injection molding machine 1 is repeated to produce the molded products P one after another.

As described above, according to the injection molding machine 1 according to the present embodiment, the injection molding machine 1 plasticizes the molten resin supplied to the cavity 81 formed between the fixed mold 83 and the movable mold 84. A metering drive device 11 for making and metering, an injection unit 10 provided with an injection drive device 12 for injecting and injecting molten resin measured by the metering drive device 11 into the cavity 81, and a movable mold for the fixed mold 83 A mold clamping unit 80 having a mold clamping drive device 82 for clamping and opening 84 is melted in the cavity 81 when the movable mold 84 is clamped to the fixed mold 83 by the mold clamping drive device 82. And an eject driving device 110 configured in a mold clamping unit 80 that ejects the eject pin 120 when the movable mold 84 is opened when the movable mold 84 is opened. The first and second pulleys 17 and 19 that transmit the driving force of the metering drive motor 15 that is the drive source of the metering drive device 11 and the metering drive timing belt 18 are not exposed to the molding machine 1. The first noise prevention cover 140 to be covered, the third to fifth pulleys 25, 26, 29 for transmitting the driving force of the injection driving motors 20, 21 as the driving source of the injection driving device 12, and the injection driving timing belt 27. , 28 so as not to be exposed to the outside, and sixth and sixth transmission forces of the mold clamping drive motor 90 as a drive source of the mold clamping drive device 82 of the mold clamping unit 80. When the molding P is molded by the injection molding machine 1, the third noise prevention cover 160 that covers the pulleys 91 and 93 and the timing belt 92 for mold clamping so as not to be exposed to the outside is provided. The first to seventh pulleys 17, 19, 25, 26, 29, 91, 93 that operate when the metering driving motor 15, the injection driving motors 20, 21, and the mold clamping driving motor 90 are driven. The first to third pulleys and the timing belts 18 for the metering drive, the timing belts 27 and 28 for injection driving, and the timing belt 92 for mold clamping driving are not exposed to the outside. By covering with the noise prevention covers 140, 150, 160, noise noise generated from the contact portion between each pulley and each timing belt can be reduced, so that the injection molding machine 1 having excellent silence can be provided. it can.

  Further, the mold clamping unit 80 provided with the mold clamping drive unit 82 is movable during or after the mold opening of the movable mold 84 with respect to the mold clamped by the mold clamping drive unit 82, that is, the fixed mold 83. The molding P attached to the inner surface of the die 84 is finally ejected to transmit the driving force of the eject driving motor 111 which is the driving source of the eject driving device 110 that operates the eject pin 120 to be removed. Since the fourth and fifth noise prevention covers 170 and 180 that cover the contact portions between the tenth pulleys 112, 114, and 115 and the ejection driving timing belt 113 so as not to be exposed to the outside are provided, the ejection driving motor 111 is provided. These pulleys of the eighth to tenth pulleys 112, 114, and 115 that are operated in accordance with the driving of the pulleys and the ejects connected to these pulleys Since at least the fourth and fifth noise prevention covers 170, 180 cover the contact portion with the moving timing belt 113, noise noise generated from these contact portions can be reduced, and the injection molding machine can be further improved. Noise noise accompanying operation can be reduced.

  Moreover, not only the first to third noise prevention covers 140, 150, and 160 but also the fourth and fifth noise prevention covers 170 and 180 are similarly screwed and fixed at predetermined positions of the injection molding machine 1. Therefore, these first to fifth noise prevention covers can be easily attached and detached by tightening or loosening screws, so that various devices inside the injection molding machine 1 can be easily maintained. Excellent in maintainability.

  Although one embodiment of the present embodiment has been described in detail above, the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist of the present invention. In the present embodiment, an example in which a toggle device is used as a mechanism for performing a movable mold with respect to a fixed mold is shown, but the present invention is not particularly limited thereto, and instead, a direct pressure type using an electric motor. Even a mold clamping / mold opening device or a hydraulic device can be applied. Further, since the toggle device and the like in this embodiment are not the gist of the present invention, their details are omitted.

It is a side view which shows the mold closing state of the metal mold | die of the injection molding machine in a present Example. It is a top view which shows the mold closing state of the metal mold | die of an injection molding machine same as the above. It is a side view which shows the mold open state of the metal mold | die of an injection molding machine same as the above. It is a top view which shows the mold open state of the metal mold | die of an injection molding machine same as the above. It is sectional drawing of an injection unit same as the above. It is a top view of an injection unit same as the above. It is a front view of an injection unit same as the above. It is a rear view of an injection unit same as the above. It is a side view which shows the mold closing state of a mold clamping unit same as the above. It is a top view which shows the mold closing state of a clamping unit same as the above. It is a front view of a mold clamping unit same as the above. It is a front view which shows the eject drive device of a mold clamping unit same as the above. It is a top sectional view of an eject drive device same as the above. It is a front view which shows a 1st noise prevention cover same as the above. It is a front view which shows a 1st cover same as the above. It is a top view which shows a 1st cover same as the above. It is a left view which shows a 1st cover same as the above. It is a front view which shows a 2nd cover same as the above. It is a top view which shows a 2nd cover same as the above. It is a left view which shows a 2nd cover same as the above. It is a front view which shows a 3rd cover same as the above. It is a left view which shows a 3rd cover same as the above. It is a front view which shows a 2nd noise prevention cover same as the above. It is a top view which shows a 2nd noise prevention cover same as the above. It is a left view which shows a 2nd noise prevention cover same as the above. It is a right view which shows a 2nd noise prevention cover same as the above. It is a front view which shows a 3rd noise prevention cover same as the above. It is a bottom view which shows a 3rd noise prevention cover same as the above. It is a right view which shows a 3rd noise prevention cover same as the above. It is a front view which shows a 4th noise prevention cover same as the above. It is a bottom view which shows a 4th noise prevention cover same as the above. It is a left view which shows a 4th noise prevention cover same as the above. It is a front view which shows a 6th noise prevention cover same as the above. It is a right view which shows a 6th noise prevention cover same as the above. It is a bottom view which shows a 6th noise prevention cover same as the above. It is a front view which shows a 7th noise prevention cover same as the above. It is a right view which shows a 7th noise prevention cover same as the above. It is a bottom view which shows a 7th noise prevention cover same as the above.

DESCRIPTION OF SYMBOLS 1 Injection molding machine 11 Metering drive device 12 Injection drive device 15 Metering drive motors 17 and 19 First and second pulleys (pulleys)
18 Timing drive timing belt (timing belt)
20, 21 Injection drive motors 25, 26, 29 Third, fourth and fifth pulleys (pulleys)
27, 28 Timing belt for injection drive (timing belt)
80 Clamping unit 81 Cavity 82 Clamping drive unit 83 Fixed mold (mold)
84 Movable mold (mold)
90 Clamping drive motors 91 and 93 Sixth and seventh pulleys (pulleys)
92 Timing belt for mold clamping (timing belt)
110 Eject Drive Device 111 Eject Drive Motor 112, 114, 115 Eighth, Ninth and Tenth Pulleys (Pulley)
113 Timing belt for eject drive (timing belt)
140 First noise prevention cover (first noise prevention drive noise prevention cover)
150 2nd noise prevention cover (2nd noise prevention cover for injection drive sources)
160 Third Noise Prevention Cover (Third Mold Clamping Drive Noise Prevention Cover)
170, 180 4th and 5th noise prevention cover (noise prevention cover for eject drive source)
P molding

Claims (3)

A metering drive device for plasticizing and weighing the molten resin supplied to the cavities formed between the molds, an injection drive device for extruding the molten resin measured by the metering drive device into the cavities, and A mold clamping drive device for performing mold clamping and mold opening of the mold, and a mold in which the molten resin is solidified in the cavity at the time of mold clamping by the mold clamping drive device at the time of mold opening of the mold In an injection molding machine equipped with an eject drive device that protrudes and removes,
A pulley and a timing belt that transmit the driving force of each driving motor that is a driving source of the injection molding machine are configured to be covered with respective noise prevention covers,
As anti-noise cover of the each, the metering drive system as a drive source metering drive of the motor driving force pulley and timing belt and a for preventing noise I covering so as not to be exposed to the outside first transmitting of and noise prevention cover metering drive source, wherein the injection drive unit as a drive source injection drive for transmitting the driving force of the motor pulley and the timing belt and the second for preventing noise I covering the so as not to be exposed to the outside of the anti-noise cover injection driving source, to prevent the mold clamping noise I covering the pulley and the timing belt so as not to be exposed to the outside to transmit the driving source serving clamping driving force of the driving motor of the driving device An injection molding machine provided with each noise prevention cover of the third mold clamping drive source noise prevention cover. As each of the noise prevention covers, in addition to the noise prevention covers for the first metering drive source, the second injection drive source, and the third mold clamping drive source, the mold clamping drive device is provided. A drive source of an eject drive device that protrudes and removes the molded product stuck to the mold during or after mold opening of the mold clamped by the mold clamping drive device to the mold clamping unit upcoming contact portion between the eject pulley and a timing belt for transmitting the driving force of the driving motor, and characterized in that a ejection driving source for noise prevention cover for preventing noise I covering so as not to be exposed to the outside The injection molding machine according to claim 1. 3. The injection molding machine according to claim 2, wherein the ejection drive source noise prevention cover comprises a plurality of noise prevention covers from a fourth noise prevention cover and a fifth noise prevention cover.

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